feat(router): add Lua scripting for routing script

https://github.com/XTLS/Xray-core/pull/6801#issuecomment-5807228464

.github/workflows/docker.yml

@@ -82,7 +82,7 @@ jobs:
         uses: docker/setup-buildx-action@v4
 
       - name: Login to GitHub Container Registry
-        uses: docker/login-action@v4
+        uses: docker/login-action@v4.6.0
         with:
           registry: ghcr.io
           username: ${{ github.repository_owner }}

.github/workflows/test.yml

@@ -67,9 +67,7 @@ jobs:
           check-latest: true
           cache: false
       - name: Check Format
-        run: |
-          go install -v mvdan.cc/gofumpt@latest
-          go run ./infra/vformat/main.go -mode check -pwd ./
+        run: go run ./infra/vformat/main.go -mode check -pwd ./
 
   test:
     needs: check-assets

app/dispatcher/default.go

@@ -470,6 +470,9 @@ func (d *DefaultDispatcher) routedDispatch(ctx context.Context, link *transport.
 				return // DO NOT CHANGE: the traffic shouldn't be processed by default outbound if the specified outbound tag doesn't exist (yet), e.g., VLESS Reverse Proxy
 			}
 		} else {
+			if err != common.ErrNoClue {
+				errors.LogErrorInner(ctx, err, "failed to pick route for ", destination)
+			}
 			errors.LogInfo(ctx, "default route for ", destination)
 		}
 	}

app/dns/config.pb.go

@@ -93,6 +93,7 @@ type NameServer struct {
 	UnexpectedIp    []*geodata.IPRule      `protobuf:"bytes,13,rep,name=unexpected_ip,json=unexpectedIp,proto3" json:"unexpected_ip,omitempty"`
 	ActUnprior      bool                   `protobuf:"varint,14,opt,name=actUnprior,proto3" json:"actUnprior,omitempty"`
 	PolicyID        uint32                 `protobuf:"varint,17,opt,name=policyID,proto3" json:"policyID,omitempty"`
+	Id              string                 `protobuf:"bytes,18,opt,name=id,proto3" json:"id,omitempty"`
 	unknownFields   protoimpl.UnknownFields
 	sizeCache       protoimpl.SizeCache
 }
@@ -239,6 +240,13 @@ func (x *NameServer) GetPolicyID() uint32 {
 	return 0
 }
 
+func (x *NameServer) GetId() string {
+	if x != nil {
+		return x.Id
+	}
+	return ""
+}
+
 type Config struct {
 	state protoimpl.MessageState `protogen:"open.v1"`
 	// NameServer list used by this DNS client.
@@ -258,8 +266,10 @@ type Config struct {
 	DisableFallback        bool          `protobuf:"varint,10,opt,name=disableFallback,proto3" json:"disableFallback,omitempty"`
 	DisableFallbackIfMatch bool          `protobuf:"varint,11,opt,name=disableFallbackIfMatch,proto3" json:"disableFallbackIfMatch,omitempty"`
 	EnableParallelQuery    bool          `protobuf:"varint,14,opt,name=enableParallelQuery,proto3" json:"enableParallelQuery,omitempty"`
-	unknownFields          protoimpl.UnknownFields
-	sizeCache              protoimpl.SizeCache
+	// Absolute path to the Lua DNS query script.
+	Script        string `protobuf:"bytes,15,opt,name=script,proto3" json:"script,omitempty"`
+	unknownFields protoimpl.UnknownFields
+	sizeCache     protoimpl.SizeCache
 }
 
 func (x *Config) Reset() {
@@ -369,6 +379,13 @@ func (x *Config) GetEnableParallelQuery() bool {
 	return false
 }
 
+func (x *Config) GetScript() string {
+	if x != nil {
+		return x.Script
+	}
+	return ""
+}
+
 type Config_HostMapping struct {
 	state  protoimpl.MessageState `protogen:"open.v1"`
 	Domain *geodata.DomainRule    `protobuf:"bytes,2,opt,name=domain,proto3" json:"domain,omitempty"`
@@ -435,7 +452,7 @@ var File_app_dns_config_proto protoreflect.FileDescriptor
 
 const file_app_dns_config_proto_rawDesc = "" +
 	"\n" +
-	"\x14app/dns/config.proto\x12\fxray.app.dns\x1a\x1ccommon/net/destination.proto\x1a\x1bcommon/geodata/geodat.proto\"\xde\x05\n" +
+	"\x14app/dns/config.proto\x12\fxray.app.dns\x1a\x1ccommon/net/destination.proto\x1a\x1bcommon/geodata/geodat.proto\"\xee\x05\n" +
 	"\n" +
 	"NameServer\x123\n" +
 	"\aaddress\x18\x01 \x01(\v2\x19.xray.common.net.EndpointR\aaddress\x12\x1b\n" +
@@ -461,10 +478,11 @@ const file_app_dns_config_proto_rawDesc = "" +
 	"\n" +
 	"actUnprior\x18\x0e \x01(\bR\n" +
 	"actUnprior\x12\x1a\n" +
-	"\bpolicyID\x18\x11 \x01(\rR\bpolicyIDB\x0f\n" +
+	"\bpolicyID\x18\x11 \x01(\rR\bpolicyID\x12\x0e\n" +
+	"\x02id\x18\x12 \x01(\tR\x02idB\x0f\n" +
 	"\r_disableCacheB\r\n" +
 	"\v_serveStaleB\x12\n" +
-	"\x10_serveExpiredTTLJ\x04\b\x04\x10\x05\"\x82\x05\n" +
+	"\x10_serveExpiredTTLJ\x04\b\x04\x10\x05\"\x9a\x05\n" +
 	"\x06Config\x129\n" +
 	"\vname_server\x18\x05 \x03(\v2\x18.xray.app.dns.NameServerR\n" +
 	"nameServer\x12\x1b\n" +
@@ -480,7 +498,8 @@ const file_app_dns_config_proto_rawDesc = "" +
 	"\x0fdisableFallback\x18\n" +
 	" \x01(\bR\x0fdisableFallback\x126\n" +
 	"\x16disableFallbackIfMatch\x18\v \x01(\bR\x16disableFallbackIfMatch\x120\n" +
-	"\x13enableParallelQuery\x18\x0e \x01(\bR\x13enableParallelQuery\x1a}\n" +
+	"\x13enableParallelQuery\x18\x0e \x01(\bR\x13enableParallelQuery\x12\x16\n" +
+	"\x06script\x18\x0f \x01(\tR\x06script\x1a}\n" +
 	"\vHostMapping\x127\n" +
 	"\x06domain\x18\x02 \x01(\v2\x1f.xray.common.geodata.DomainRuleR\x06domain\x12\x0e\n" +
 	"\x02ip\x18\x03 \x03(\fR\x02ip\x12%\n" +

app/dns/config.proto

@@ -27,6 +27,7 @@ message NameServer {
   repeated xray.common.geodata.IPRule unexpected_ip = 13;
   bool actUnprior = 14;
   uint32 policyID = 17;
+  string id = 18;
 }
 
 enum QueryStrategy {
@@ -73,4 +74,7 @@ message Config {
   bool disableFallbackIfMatch = 11;
 
   bool enableParallelQuery = 14;
+
+  // Absolute path to the Lua DNS query script.
+  string script = 15;
 }

app/dns/dns.go

@@ -31,6 +31,8 @@ type DNS struct {
 	domainMatcher          geodata.DomainMatcher
 	matcherInfos           []*DomainMatcherInfo
 	checkSystem            bool
+	script                 *scriptEngine
+	scriptPath             string
 }
 
 // DomainMatcherInfo contains information attached to index returned by Server.domainMatcher.
@@ -180,6 +182,7 @@ func New(ctx context.Context, config *Config) (*DNS, error) {
 		disableFallbackIfMatch: config.DisableFallbackIfMatch,
 		enableParallelQuery:    config.EnableParallelQuery,
 		checkSystem:            checkSystem,
+		scriptPath:             config.Script,
 	}, nil
 }
 
@@ -190,11 +193,21 @@ func (*DNS) Type() interface{} {
 
 // Start implements common.Runnable.
 func (s *DNS) Start() error {
+	if s.scriptPath != "" {
+		engine, err := newScriptEngine(s.scriptPath, s)
+		if err != nil {
+			return errors.New("failed to initialize DNS script").Base(err)
+		}
+		s.script = engine
+	}
 	return nil
 }
 
 // Close implements common.Closable.
 func (s *DNS) Close() error {
+	if s.script != nil {
+		s.script.close()
+	}
 	return nil
 }
 
@@ -257,6 +270,9 @@ func (s *DNS) LookupIP(domain string, option dns.IPOption) ([]net.IP, uint32, er
 	}
 
 	// Name servers lookup
+	if s.script != nil {
+		return s.script.query(domain, option)
+	}
 	if s.enableParallelQuery {
 		return s.parallelQuery(domain, option)
 	} else {

app/dns/lua.go

@@ -0,0 +1,180 @@
+package dns
+
+import (
+	"context"
+	"math"
+	"strings"
+
+	"github.com/xtls/xray-core/common/errors"
+	"github.com/xtls/xray-core/common/net"
+	featureDNS "github.com/xtls/xray-core/features/dns"
+	lua "github.com/yuin/gopher-lua"
+)
+
+// RegisterLua makes xray.dns available with Query and optional Servers.
+func RegisterLua(L *lua.LState, client featureDNS.Client) {
+	// A configured DNS app passes its *DNS instance here.
+	if s, ok := client.(*DNS); ok {
+		registerLua(L, s, true)
+		return
+	}
+	L.PreloadModule("xray.dns", func(L *lua.LState) int {
+		module := L.NewTable()
+		module.RawSetString("Query", newLuaClientQuery(L, client))
+		L.Push(module)
+		return 1
+	})
+}
+
+// RegisterLua makes xray.dns available to DNS scripts with Servers so no Query.
+func (s *DNS) RegisterLua(L *lua.LState) {
+	registerLua(L, s, false)
+}
+
+func registerLua(L *lua.LState, s *DNS, exposeQuery bool) {
+	L.PreloadModule("xray.dns", func(L *lua.LState) int {
+		servers := L.NewTable()
+		for i, client := range s.clients {
+			server := L.NewTable()
+
+			server.RawSetString("ID", lua.LString(client.id))
+
+			server.RawSetString("Query", L.NewFunction(func(L *lua.LState) int {
+				domain, ok := L.Get(2).(lua.LString)
+				if !ok {
+					L.RaiseError("server:Query requires a domain")
+					return 0
+				}
+				option := featureDNS.IPOption{
+					IPv4Enable: L.CheckBool(3),
+					IPv6Enable: L.CheckBool(4),
+					FakeEnable: L.CheckBool(5),
+				}
+				ctx := L.Context()
+				if ctx == nil {
+					L.RaiseError("server:Query requires an active DNS query")
+					return 0
+				}
+				var ips []net.IP
+				var ttl uint32
+				var err error
+				if !option.FakeEnable && strings.EqualFold(client.Name(), "FakeDNS") {
+					err = featureDNS.ErrEmptyResponse
+				} else {
+					ips, ttl, err = client.QueryIP(ctx, string(domain), option)
+				}
+				addresses := L.NewUserData()
+				addresses.Value = ips
+				L.Push(addresses)
+				L.Push(lua.LNumber(ttl))
+				if err != nil {
+					ud := L.NewUserData()
+					ud.Value = err
+					L.Push(ud)
+				} else {
+					L.Push(lua.LNil)
+				}
+				return 3
+			}))
+			servers.RawSetInt(i+1, server)
+		}
+
+		module := L.NewTable()
+		module.RawSetString("Servers", servers)
+		if exposeQuery {
+			module.RawSetString("Query", newLuaClientQuery(L, s))
+		}
+		L.Push(module)
+		return 1
+	})
+}
+
+func newLuaClientQuery(L *lua.LState, client featureDNS.Client) *lua.LFunction {
+	return L.NewFunction(func(L *lua.LState) int {
+		domain, ok := L.Get(1).(lua.LString)
+		if !ok {
+			L.RaiseError("dns.Query requires a domain")
+			return 0
+		}
+		option := featureDNS.IPOption{
+			IPv4Enable: L.CheckBool(2),
+			IPv6Enable: L.CheckBool(3),
+			FakeEnable: L.CheckBool(4),
+		}
+		if L.Context() == nil {
+			L.RaiseError("dns.Query requires an active DNS query")
+			return 0
+		}
+		ips, ttl, err := client.LookupIP(string(domain), option)
+		addresses := L.NewUserData()
+		addresses.Value = ips
+		L.Push(addresses)
+		L.Push(lua.LNumber(ttl))
+		if err != nil {
+			ud := L.NewUserData()
+			ud.Value = err
+			L.Push(ud)
+		} else {
+			L.Push(lua.LNil)
+		}
+		return 3
+	})
+}
+
+// CallLuaHook invokes HandleDNSQuery in the supplied state.
+// Returned slices and IP bytes may share storage with DNS caches or matcher inputs.
+func (s *DNS) CallLuaHook(L *lua.LState, ctx context.Context, domain string, option featureDNS.IPOption) ([]net.IP, uint32, error) {
+	previous, top := L.Context(), L.GetTop()
+	L.SetContext(ctx)
+	defer func() {
+		L.SetTop(top)
+		if previous == nil {
+			L.RemoveContext()
+		} else {
+			L.SetContext(previous)
+		}
+	}()
+	fn := L.GetGlobal("HandleDNSQuery")
+	if fn.Type() != lua.LTFunction {
+		return nil, 0, errors.New("DNS script must define HandleDNSQuery(domain, ipv4, ipv6, fake)")
+	}
+	if err := L.CallByParam(lua.P{Fn: fn, NRet: 3, Protect: true},
+		lua.LString(strings.ToLower(domain)), lua.LBool(option.IPv4Enable),
+		lua.LBool(option.IPv6Enable), lua.LBool(option.FakeEnable)); err != nil {
+		return nil, 0, err
+	}
+	return readLuaDNSResult(L.Get(-3), L.Get(-2), L.Get(-1))
+}
+
+func readLuaDNSResult(addresses, ttlValue, errorValue lua.LValue) ([]net.IP, uint32, error) {
+	if errorValue != lua.LNil {
+		if ud, ok := errorValue.(*lua.LUserData); ok {
+			if err, ok := ud.Value.(error); ok {
+				return nil, 0, err
+			}
+		}
+		if s, ok := errorValue.(lua.LString); ok {
+			return nil, 0, errors.New(string(s))
+		}
+		return nil, 0, errors.New("DNS script error must be an error or string")
+	}
+	ttl, ok := ttlValue.(lua.LNumber)
+	if !ok || ttl < 0 || ttl > math.MaxUint32 || math.Trunc(float64(ttl)) != float64(ttl) {
+		return nil, 0, errors.New("DNS script returned invalid TTL")
+	}
+	if addresses == lua.LNil {
+		return nil, 0, featureDNS.ErrEmptyResponse
+	}
+	ud, ok := addresses.(*lua.LUserData)
+	if !ok {
+		return nil, 0, errors.New("DNS script IPs must be native IP slice userdata")
+	}
+	ips, ok := ud.Value.([]net.IP)
+	if !ok {
+		return nil, 0, errors.New("DNS script IPs must be native IP slice userdata")
+	}
+	if len(ips) == 0 {
+		return nil, 0, featureDNS.ErrEmptyResponse
+	}
+	return ips, uint32(ttl), nil
+}

app/dns/lua_test.go

@@ -0,0 +1,234 @@
+package dns
+
+import (
+	"context"
+	go_errors "errors"
+	"math"
+	"strings"
+	"testing"
+	"time"
+
+	"github.com/xtls/xray-core/common/geodata"
+	"github.com/xtls/xray-core/common/net"
+	featureDNS "github.com/xtls/xray-core/features/dns"
+	lua "github.com/yuin/gopher-lua"
+)
+
+func TestReadLuaDNSResult(t *testing.T) {
+	L := lua.NewState()
+	defer L.Close()
+	want := []net.IP{net.ParseIP("8.8.8.8"), {127, 0, 0, 1}, net.ParseIP("::1")}
+	addresses := L.NewUserData()
+	addresses.Value = want
+	ips, ttl, err := readLuaDNSResult(addresses, lua.LNumber(45), lua.LNil)
+	if err != nil || ttl != 45 || len(ips) != len(want) {
+		t.Fatalf("readLuaDNSResult() = %v, TTL %d, %v", ips, ttl, err)
+	}
+	for i := range want {
+		if !ips[i].Equal(want[i]) {
+			t.Fatalf("IP %d = %v, want %v", i, ips[i], want[i])
+		}
+	}
+}
+
+func TestReadLuaDNSResultValidation(t *testing.T) {
+	L := lua.NewState()
+	defer L.Close()
+
+	for _, tc := range []struct {
+		name   string
+		change func(*[3]lua.LValue)
+		want   string
+	}{
+		{"fractional TTL", func(v *[3]lua.LValue) { v[1] = lua.LNumber(1.5) }, "invalid TTL"},
+		{"oversized TTL", func(v *[3]lua.LValue) { v[1] = lua.LNumber(4294967296) }, "invalid TTL"},
+		{"negative TTL", func(v *[3]lua.LValue) { v[1] = lua.LNumber(-1) }, "invalid TTL"},
+		{"NaN TTL", func(v *[3]lua.LValue) { v[1] = lua.LNumber(math.NaN()) }, "invalid TTL"},
+		{"missing TTL", func(v *[3]lua.LValue) { v[1] = lua.LNil }, "invalid TTL"},
+		{"string IPs", func(v *[3]lua.LValue) { v[0] = lua.LString("127.0.0.1") }, "native IP slice"},
+		{"wrong userdata", func(v *[3]lua.LValue) { v[0].(*lua.LUserData).Value = net.ParseIP("127.0.0.1") }, "native IP slice"},
+		{"script error", func(v *[3]lua.LValue) { v[2] = lua.LString("blocked by script") }, "blocked by script"},
+		{"invalid error", func(v *[3]lua.LValue) { v[2] = lua.LTrue }, "error or string"},
+	} {
+		t.Run(tc.name, func(t *testing.T) {
+			addresses := L.NewUserData()
+			addresses.Value = []net.IP{net.ParseIP("127.0.0.1")}
+			values := [3]lua.LValue{addresses, lua.LNumber(60), lua.LNil}
+			tc.change(&values)
+			_, _, err := readLuaDNSResult(values[0], values[1], values[2])
+			if err == nil || !strings.Contains(err.Error(), tc.want) {
+				t.Fatalf("readLuaDNSResult error = %v, want %q", err, tc.want)
+			}
+		})
+	}
+
+	addresses := L.NewUserData()
+	addresses.Value = []net.IP(nil)
+	for _, empty := range []lua.LValue{addresses, lua.LNil} {
+		if _, _, err := readLuaDNSResult(empty, lua.LNumber(0), lua.LNil); !go_errors.Is(err, featureDNS.ErrEmptyResponse) {
+			t.Fatalf("empty result error = %v, want ErrEmptyResponse", err)
+		}
+	}
+	wantErr := go_errors.New("upstream failed")
+	errorValue := L.NewUserData()
+	errorValue.Value = wantErr
+	if _, _, err := readLuaDNSResult(lua.LNil, lua.LNil, errorValue); err != wantErr {
+		t.Fatalf("upstream error = %v, want original error %v", err, wantErr)
+	}
+}
+
+func TestCallLuaHookCancellation(t *testing.T) {
+	L := lua.NewState()
+	defer L.Close()
+	if err := L.DoString(`function HandleDNSQuery(domain, ipv4, ipv6, fake) while true do end end`); err != nil {
+		t.Fatal(err)
+	}
+	ctx, cancel := context.WithTimeout(context.Background(), 50*time.Millisecond)
+	defer cancel()
+	_, _, err := (&DNS{}).CallLuaHook(L, ctx, "example.com", featureDNS.IPOption{IPv4Enable: true})
+	if err == nil {
+		t.Fatal("CallLuaHook did not stop after context cancellation")
+	}
+	if L.Context() != nil {
+		t.Fatal("CallLuaHook left the canceled context on the Lua state")
+	}
+}
+
+func TestCallLuaHookNormalizesDomain(t *testing.T) {
+	L := lua.NewState()
+	defer L.Close()
+	addresses := L.NewUserData()
+	addresses.Value = []net.IP{net.ParseIP("127.0.0.1")}
+	L.SetGlobal("ips", addresses)
+	if err := L.DoString(`
+		function HandleDNSQuery(domain, ipv4, ipv6, fake)
+			assert(domain == "example.com")
+			assert(ipv4 and not ipv6 and not fake)
+			return ips, 60, nil
+		end
+	`); err != nil {
+		t.Fatal(err)
+	}
+	s := &DNS{}
+	if _, _, err := s.CallLuaHook(L, context.Background(), "ExAmPlE.CoM", featureDNS.IPOption{IPv4Enable: true}); err != nil {
+		t.Fatal(err)
+	}
+}
+
+func TestCallLuaHookRestoresState(t *testing.T) {
+	for _, tc := range []struct {
+		name    string
+		body    string
+		wantErr bool
+	}{
+		{"success", `return ips, 60`, false},
+		{"error", `error("failed")`, true},
+	} {
+		t.Run(tc.name, func(t *testing.T) {
+			L := lua.NewState()
+			defer L.Close()
+			addresses := L.NewUserData()
+			addresses.Value = []net.IP{net.ParseIP("127.0.0.1")}
+			L.SetGlobal("ips", addresses)
+			if err := L.DoString("function HandleDNSQuery() " + tc.body + " end"); err != nil {
+				t.Fatal(err)
+			}
+			previous, cancel := context.WithCancel(context.Background())
+			defer cancel()
+			L.SetContext(previous)
+			L.Push(lua.LTrue)
+			_, _, err := (&DNS{}).CallLuaHook(L, context.Background(), "example.com", featureDNS.IPOption{IPv4Enable: true})
+			if (err != nil) != tc.wantErr {
+				t.Fatalf("hook error = %v, want error %t", err, tc.wantErr)
+			}
+			if L.Context() != previous || L.GetTop() != 1 || L.Get(1) != lua.LTrue {
+				t.Fatal("hook did not restore the previous context and stack")
+			}
+		})
+	}
+}
+
+func TestLuaDNSServerQuery(t *testing.T) {
+	L := lua.NewState()
+	defer L.Close()
+	geodata.RegisterLua(L)
+	option := featureDNS.IPOption{IPv4Enable: true}
+	ips := []net.IP{net.ParseIP("127.0.0.1"), net.ParseIP("8.8.8.8")}
+	server := &DNS{clients: []*Client{{server: &benchmarkLuaNameServer{ips: ips}, ipOption: &option, timeoutMs: time.Second}}}
+	server.RegisterLua(L)
+	if err := L.DoString(`
+local server = require("xray.dns").Servers[1]
+local matcher = require("xray.geodata").BuildIPMatcher("127.0.0.0/8")
+function HandleDNSQuery(domain, ipv4, ipv6, fake)
+    local ips, ttl, err = server:Query(domain, ipv4, ipv6, fake)
+    assert(type(ips) == "userdata" and not err)
+    assert(matcher:AnyMatch(ips))
+    local matched = matcher:FilterIPs(ips)
+    return matched, ttl, err
+end
+`); err != nil {
+		t.Fatal(err)
+	}
+	got, ttl, err := server.CallLuaHook(L, context.Background(), "example.com", option)
+	if err != nil || ttl != 60 || len(got) != 1 || !got[0].Equal(ips[0]) {
+		t.Fatalf("server query = %v, TTL %d, %v", got, ttl, err)
+	}
+}
+
+type benchmarkLuaNameServer struct {
+	ips []net.IP
+}
+
+func (*benchmarkLuaNameServer) Name() string         { return "benchmark" }
+func (*benchmarkLuaNameServer) IsDisableCache() bool { return true }
+func (s *benchmarkLuaNameServer) QueryIP(context.Context, string, featureDNS.IPOption) ([]net.IP, uint32, error) {
+	return s.ips, 60, nil
+}
+
+// BenchmarkLuaDNSHookCall isolates a preloaded Lua hook and its server:Query bridge.
+// The direct case measures the same DNS client without Lua.
+func BenchmarkLuaDNSHookCall(b *testing.B) {
+	option := featureDNS.IPOption{IPv4Enable: true}
+	ip := net.ParseIP("127.0.0.1")
+	upstream := &benchmarkLuaNameServer{ips: []net.IP{ip}}
+	client := &Client{server: upstream, ipOption: &option, timeoutMs: time.Second}
+	server := &DNS{clients: []*Client{client}}
+	L := lua.NewState()
+	defer L.Close()
+	server.RegisterLua(L)
+	if err := L.DoString(`
+local server = require("xray.dns").Servers[1]
+function HandleDNSQuery(domain, ipv4, ipv6, fake)
+    return server:Query(domain, ipv4, ipv6, fake)
+end
+`); err != nil {
+		b.Fatal(err)
+	}
+
+	ctx := context.Background()
+	for _, bench := range []struct {
+		name  string
+		query func() ([]net.IP, uint32, error)
+	}{
+		{"direct", func() ([]net.IP, uint32, error) { return client.QueryIP(ctx, "example.com", option) }},
+		{"lua_hook", func() ([]net.IP, uint32, error) { return server.CallLuaHook(L, ctx, "example.com", option) }},
+	} {
+		b.Run(bench.name, func(b *testing.B) {
+			b.ReportAllocs()
+			b.ResetTimer()
+			var ips []net.IP
+			var ttl uint32
+			var err error
+			for i := 0; i < b.N; i++ {
+				ips, ttl, err = bench.query()
+				if err != nil {
+					b.Fatal(err)
+				}
+			}
+			b.StopTimer()
+			if ttl != 60 || len(ips) != 1 || !ips[0].Equal(ip) {
+				b.Fatalf("query() = %v, TTL %d; want %v, TTL 60", ips, ttl, ip)
+			}
+		})
+	}
+}

app/dns/nameserver.go

@@ -29,6 +29,7 @@ type Server interface {
 
 // Client is the interface for DNS client.
 type Client struct {
+	id            string
 	server        Server
 	skipFallback  bool
 	expectedIPs   geodata.IPMatcher
@@ -97,7 +98,7 @@ func NewClient(
 	ipOption dns.IPOption,
 	updateRules func(bool),
 ) (*Client, error) {
-	client := &Client{}
+	client := &Client{id: ns.Id}
 	err := core.RequireFeatures(ctx, func(dispatcher routing.Dispatcher) error {
 		// Create a new server for each client for now
 		server, err := NewServer(ctx, ns.Address.AsDestination(), dispatcher, disableCache, serveStale, serveExpiredTTL, clientIP)

app/dns/nameserver_local.go

@@ -49,5 +49,5 @@ func NewLocalNameServer() *LocalNameServer {
 
 // NewLocalDNSClient creates localdns client object for directly lookup in system DNS.
 func NewLocalDNSClient(ipOption dns.IPOption) *Client {
-	return &Client{server: NewLocalNameServer(), ipOption: &ipOption}
+	return &Client{id: "localhost", server: NewLocalNameServer(), ipOption: &ipOption}
 }

app/dns/script.go

@@ -0,0 +1,73 @@
+package dns
+
+import (
+	"context"
+	"time"
+
+	"github.com/xtls/xray-core/common/errors"
+	"github.com/xtls/xray-core/common/geodata"
+	"github.com/xtls/xray-core/common/log"
+	luamgr "github.com/xtls/xray-core/common/lua"
+	"github.com/xtls/xray-core/common/net"
+	"github.com/xtls/xray-core/features/dns"
+	lua "github.com/yuin/gopher-lua"
+)
+
+const scriptExecutionTimeout = 10 * time.Second
+
+type scriptEngine struct {
+	dns  *DNS
+	pool *luamgr.Pool
+}
+
+func newScriptEngine(path string, server *DNS) (*scriptEngine, error) {
+	program, err := luamgr.CompileFile(path)
+	if err != nil {
+		return nil, err
+	}
+	e := &scriptEngine{dns: server}
+	e.pool, err = luamgr.NewPool(server.ctx, func(poolCtx context.Context) (*lua.LState, error) {
+		initCtx, cancel := context.WithTimeout(poolCtx, scriptExecutionTimeout)
+		defer cancel()
+		L, err := program.NewState(initCtx, func(L *lua.LState) {
+			geodata.RegisterLua(L)
+			log.RegisterLua(L)
+			server.RegisterLua(L)
+		})
+		if err != nil {
+			return nil, err
+		}
+		if L.GetGlobal("HandleDNSQuery").Type() != lua.LTFunction {
+			L.Close()
+			return nil, errors.New("DNS script must define HandleDNSQuery(domain, ipv4, ipv6, fake)")
+		}
+		return L, nil
+	})
+	if err != nil {
+		return nil, err
+	}
+	errors.LogInfo(server.ctx, "DNS script initialized from ", path)
+	return e, nil
+}
+
+func (e *scriptEngine) close() {
+	e.pool.Close()
+}
+
+func (e *scriptEngine) query(domain string, option dns.IPOption) ([]net.IP, uint32, error) {
+	L, err := e.pool.Acquire()
+	if err != nil {
+		return nil, 0, err
+	}
+	reusable := false
+	defer func() {
+		e.pool.Release(L, reusable)
+	}()
+	queryCtx, cancel := context.WithTimeout(e.pool.Context(), scriptExecutionTimeout)
+	defer cancel()
+	ips, ttl, err := e.dns.CallLuaHook(L, queryCtx, domain, option)
+	if err == nil {
+		reusable = true
+	}
+	return ips, ttl, err
+}

app/dns/script_test.go

@@ -0,0 +1,197 @@
+package dns
+
+import (
+	"context"
+	"os"
+	"path/filepath"
+	"strings"
+	"testing"
+	"time"
+
+	"github.com/xtls/xray-core/common/net"
+	featureDNS "github.com/xtls/xray-core/features/dns"
+)
+
+type geoIPScriptNameServer struct {
+	name    string
+	answers map[string]net.IP
+	ttl     uint32
+	calls   int
+}
+
+func (s *geoIPScriptNameServer) Name() string         { return s.name }
+func (s *geoIPScriptNameServer) IsDisableCache() bool { return true }
+
+func (s *geoIPScriptNameServer) QueryIP(ctx context.Context, domain string, _ featureDNS.IPOption) ([]net.IP, uint32, error) {
+	if err := ctx.Err(); err != nil {
+		return nil, 0, err
+	}
+	s.calls++
+	ip, ok := s.answers[domain]
+	if !ok {
+		return nil, 0, featureDNS.ErrEmptyResponse
+	}
+	return []net.IP{ip}, s.ttl, nil
+}
+
+func TestDNSScriptGeoIPFallback(t *testing.T) {
+	t.Setenv("xray.location.asset", filepath.Join("..", "..", "resources"))
+	script := `
+local servers = require("xray.dns").Servers
+local us_ips = require("xray.geodata").BuildIPMatcher("geoip:us")
+
+local by_id = {}
+for _, server in ipairs(servers) do
+    by_id[server.ID] = server
+end
+assert(by_id.primary and by_id.fallback, "primary and fallback DNS servers are required")
+
+function HandleDNSQuery(domain, ipv4, ipv6, fake)
+    local ips, ttl, err = by_id.primary:Query(domain, ipv4, ipv6, fake)
+    if not err and us_ips:AnyMatch(ips) then
+        return ips, ttl, nil
+    end
+    return by_id.fallback:Query(domain, ipv4, ipv6, fake)
+end
+`
+	scriptPath := filepath.Join(t.TempDir(), "geoip_fallback.lua")
+	if err := os.WriteFile(scriptPath, []byte(script), 0o600); err != nil {
+		t.Fatal(err)
+	}
+
+	primary := &geoIPScriptNameServer{
+		name: "primary",
+		answers: map[string]net.IP{
+			"us.example":    net.ParseIP("2001:4860:4860::8888"),
+			"other.example": net.ParseIP("127.0.0.1"),
+		},
+		ttl: 30,
+	}
+	fallback := &geoIPScriptNameServer{
+		name:    "fallback",
+		answers: map[string]net.IP{"other.example": net.ParseIP("9.9.9.9")},
+		ttl:     60,
+	}
+	option := featureDNS.IPOption{IPv4Enable: true, IPv6Enable: true}
+	hosts, err := NewStaticHosts(nil)
+	if err != nil {
+		t.Fatal(err)
+	}
+	server := &DNS{
+		ctx:        context.Background(),
+		hosts:      hosts,
+		ipOption:   &option,
+		scriptPath: scriptPath,
+		clients: []*Client{
+			{id: "primary", server: primary, ipOption: &option, timeoutMs: 2 * time.Second},
+			{id: "fallback", server: fallback, ipOption: &option, timeoutMs: 2 * time.Second},
+		},
+	}
+	if err := server.Start(); err != nil {
+		t.Fatal(err)
+	}
+	defer server.Close()
+
+	for _, tc := range []struct {
+		domain string
+		ip     net.IP
+		ttl    uint32
+	}{
+		{"Us.Example.", net.ParseIP("2001:4860:4860::8888"), 30},
+		{"other.example", net.ParseIP("9.9.9.9"), 60},
+	} {
+		ips, ttl, err := server.LookupIP(tc.domain, option)
+		if err != nil {
+			t.Fatalf("LookupIP(%q): %v", tc.domain, err)
+		}
+		if ttl != tc.ttl || len(ips) != 1 || !ips[0].Equal(tc.ip) {
+			t.Fatalf("LookupIP(%q) = %v, TTL %d; want %v, TTL %d", tc.domain, ips, ttl, tc.ip, tc.ttl)
+		}
+	}
+	if primary.calls != 2 || fallback.calls != 1 {
+		t.Fatalf("upstream calls: primary %d, fallback %d; want 2 and 1", primary.calls, fallback.calls)
+	}
+}
+
+func TestDNSScriptRejectsInvalidStartup(t *testing.T) {
+	for _, tc := range []struct {
+		name   string
+		script string
+	}{
+		{"syntax", "function HandleDNSQuery("},
+		{"missing hook", "value = 1"},
+		{"top-level error", `error("setup failed")`},
+	} {
+		t.Run(tc.name, func(t *testing.T) {
+			path := filepath.Join(t.TempDir(), "script.lua")
+			if err := os.WriteFile(path, []byte(tc.script), 0o600); err != nil {
+				t.Fatal(err)
+			}
+			server := &DNS{ctx: context.Background(), scriptPath: path}
+			if err := server.Start(); err == nil {
+				t.Fatal("Start accepted an invalid DNS script")
+			}
+			if server.script != nil {
+				t.Fatal("Start retained a script engine after failure")
+			}
+		})
+	}
+}
+
+func TestDNSScriptHookErrorAndFakeDNSOption(t *testing.T) {
+	path := filepath.Join(t.TempDir(), "script.lua")
+	script := `
+local server = require("xray.dns").Servers[1]
+local log = require("xray.log")
+log.Info("DNS script loaded")
+function HandleDNSQuery(domain, ipv4, ipv6, fake)
+    log.Debug("DNS query: ", domain)
+    if domain == "bad.example" then error("script failure") end
+    local ips, ttl, err = server:Query(domain, ipv4, ipv6, fake)
+    if err then log.Error("DNS failed: ", err) end
+    return ips, ttl, err
+end
+`
+	if err := os.WriteFile(path, []byte(script), 0o600); err != nil {
+		t.Fatal(err)
+	}
+	option := featureDNS.IPOption{IPv4Enable: true}
+	hosts, err := NewStaticHosts(nil)
+	if err != nil {
+		t.Fatal(err)
+	}
+	upstream := &geoIPScriptNameServer{
+		name:    "FakeDNS",
+		answers: map[string]net.IP{"good.example": net.ParseIP("198.18.0.1")},
+		ttl:     30,
+	}
+	server := &DNS{
+		ctx:        context.Background(),
+		hosts:      hosts,
+		ipOption:   &option,
+		scriptPath: path,
+		clients:    []*Client{{id: "fake", server: upstream, ipOption: &option, timeoutMs: time.Second}},
+	}
+	if err := server.Start(); err != nil {
+		t.Fatal(err)
+	}
+	defer server.Close()
+
+	if _, _, err := server.LookupIP("bad.example", option); err == nil || !strings.Contains(err.Error(), "script failure") {
+		t.Fatalf("hook failure = %v, want script failure", err)
+	}
+	if _, _, err := server.LookupIP("good.example", option); err != featureDNS.ErrEmptyResponse {
+		t.Fatalf("FakeDNS without FakeEnable = %v, want ErrEmptyResponse", err)
+	}
+	if upstream.calls != 0 {
+		t.Fatalf("FakeDNS was queried without FakeEnable: %d calls", upstream.calls)
+	}
+	withFake := featureDNS.IPOption{IPv4Enable: true, FakeEnable: true}
+	ips, ttl, err := server.LookupIP("good.example", withFake)
+	if err != nil || ttl != 30 || len(ips) != 1 || !ips[0].Equal(net.ParseIP("198.18.0.1")) {
+		t.Fatalf("FakeDNS with FakeEnable = %v, TTL %d, %v", ips, ttl, err)
+	}
+	if upstream.calls != 1 {
+		t.Fatalf("FakeDNS query count = %d, want 1", upstream.calls)
+	}
+}

app/observatory/observer.go

@@ -78,6 +78,12 @@ func (o *Observer) background() {
 			sleepTime = time.Duration(o.config.ProbeInterval)
 		}
 
+		if len(outbounds) == 0 {
+			errors.LogWarning(o.ctx, "no outbound matches subjectSelector ", o.config.SubjectSelector)
+			time.Sleep(sleepTime)
+			continue
+		}
+
 		if !o.config.EnableConcurrency {
 			sort.Strings(outbounds)
 			for _, v := range outbounds {

app/proxyman/config.pb.go

@@ -330,7 +330,6 @@ type SenderConfig struct {
 	// Send traffic through the given IP. Only IP is allowed.
 	Via               *net.IPOrDomain         `protobuf:"bytes,1,opt,name=via,proto3" json:"via,omitempty"`
 	StreamSettings    *internet.StreamConfig  `protobuf:"bytes,2,opt,name=stream_settings,json=streamSettings,proto3" json:"stream_settings,omitempty"`
-	ProxySettings     *internet.ProxyConfig   `protobuf:"bytes,3,opt,name=proxy_settings,json=proxySettings,proto3" json:"proxy_settings,omitempty"`
 	MultiplexSettings *MultiplexingConfig     `protobuf:"bytes,4,opt,name=multiplex_settings,json=multiplexSettings,proto3" json:"multiplex_settings,omitempty"`
 	ViaCidr           string                  `protobuf:"bytes,5,opt,name=via_cidr,json=viaCidr,proto3" json:"via_cidr,omitempty"`
 	TargetStrategy    internet.DomainStrategy `protobuf:"varint,6,opt,name=target_strategy,json=targetStrategy,proto3,enum=xray.transport.internet.DomainStrategy" json:"target_strategy,omitempty"`
@@ -382,13 +381,6 @@ func (x *SenderConfig) GetStreamSettings() *internet.StreamConfig {
 	return nil
 }
 
-func (x *SenderConfig) GetProxySettings() *internet.ProxyConfig {
-	if x != nil {
-		return x.ProxySettings
-	}
-	return nil
-}
-
 func (x *SenderConfig) GetMultiplexSettings() *MultiplexingConfig {
 	if x != nil {
 		return x.MultiplexSettings
@@ -506,14 +498,13 @@ const file_app_proxyman_config_proto_rawDesc = "" +
 	"\x03tag\x18\x01 \x01(\tR\x03tag\x12M\n" +
 	"\x11receiver_settings\x18\x02 \x01(\v2 .xray.common.serial.TypedMessageR\x10receiverSettings\x12G\n" +
 	"\x0eproxy_settings\x18\x03 \x01(\v2 .xray.common.serial.TypedMessageR\rproxySettings\"\x10\n" +
-	"\x0eOutboundConfig\"\x9d\x03\n" +
+	"\x0eOutboundConfig\"\xd6\x02\n" +
 	"\fSenderConfig\x12-\n" +
 	"\x03via\x18\x01 \x01(\v2\x1b.xray.common.net.IPOrDomainR\x03via\x12N\n" +
-	"\x0fstream_settings\x18\x02 \x01(\v2%.xray.transport.internet.StreamConfigR\x0estreamSettings\x12K\n" +
-	"\x0eproxy_settings\x18\x03 \x01(\v2$.xray.transport.internet.ProxyConfigR\rproxySettings\x12T\n" +
+	"\x0fstream_settings\x18\x02 \x01(\v2%.xray.transport.internet.StreamConfigR\x0estreamSettings\x12T\n" +
 	"\x12multiplex_settings\x18\x04 \x01(\v2%.xray.app.proxyman.MultiplexingConfigR\x11multiplexSettings\x12\x19\n" +
 	"\bvia_cidr\x18\x05 \x01(\tR\aviaCidr\x12P\n" +
-	"\x0ftarget_strategy\x18\x06 \x01(\x0e2'.xray.transport.internet.DomainStrategyR\x0etargetStrategy\"\xa4\x01\n" +
+	"\x0ftarget_strategy\x18\x06 \x01(\x0e2'.xray.transport.internet.DomainStrategyR\x0etargetStrategyJ\x04\b\x03\x10\x04\"\xa4\x01\n" +
 	"\x12MultiplexingConfig\x12\x18\n" +
 	"\aenabled\x18\x01 \x01(\bR\aenabled\x12 \n" +
 	"\vconcurrency\x18\x02 \x01(\x05R\vconcurrency\x12(\n" +
@@ -548,8 +539,7 @@ var file_app_proxyman_config_proto_goTypes = []any{
 	(*net.IPOrDomain)(nil),        // 10: xray.common.net.IPOrDomain
 	(*internet.StreamConfig)(nil), // 11: xray.transport.internet.StreamConfig
 	(*serial.TypedMessage)(nil),   // 12: xray.common.serial.TypedMessage
-	(*internet.ProxyConfig)(nil),  // 13: xray.transport.internet.ProxyConfig
-	(internet.DomainStrategy)(0),  // 14: xray.transport.internet.DomainStrategy
+	(internet.DomainStrategy)(0),  // 13: xray.transport.internet.DomainStrategy
 }
 var file_app_proxyman_config_proto_depIdxs = []int32{
 	7,  // 0: xray.app.proxyman.SniffingConfig.domains_excluded:type_name -> xray.common.geodata.DomainRule
@@ -562,14 +552,13 @@ var file_app_proxyman_config_proto_depIdxs = []int32{
 	12, // 7: xray.app.proxyman.InboundHandlerConfig.proxy_settings:type_name -> xray.common.serial.TypedMessage
 	10, // 8: xray.app.proxyman.SenderConfig.via:type_name -> xray.common.net.IPOrDomain
 	11, // 9: xray.app.proxyman.SenderConfig.stream_settings:type_name -> xray.transport.internet.StreamConfig
-	13, // 10: xray.app.proxyman.SenderConfig.proxy_settings:type_name -> xray.transport.internet.ProxyConfig
-	6,  // 11: xray.app.proxyman.SenderConfig.multiplex_settings:type_name -> xray.app.proxyman.MultiplexingConfig
-	14, // 12: xray.app.proxyman.SenderConfig.target_strategy:type_name -> xray.transport.internet.DomainStrategy
-	13, // [13:13] is the sub-list for method output_type
-	13, // [13:13] is the sub-list for method input_type
-	13, // [13:13] is the sub-list for extension type_name
-	13, // [13:13] is the sub-list for extension extendee
-	0,  // [0:13] is the sub-list for field type_name
+	6,  // 10: xray.app.proxyman.SenderConfig.multiplex_settings:type_name -> xray.app.proxyman.MultiplexingConfig
+	13, // 11: xray.app.proxyman.SenderConfig.target_strategy:type_name -> xray.transport.internet.DomainStrategy
+	12, // [12:12] is the sub-list for method output_type
+	12, // [12:12] is the sub-list for method input_type
+	12, // [12:12] is the sub-list for extension type_name
+	12, // [12:12] is the sub-list for extension extendee
+	0,  // [0:12] is the sub-list for field type_name
 }
 
 func init() { file_app_proxyman_config_proto_init() }

app/proxyman/config.proto

@@ -57,7 +57,7 @@ message SenderConfig {
   // Send traffic through the given IP. Only IP is allowed.
   xray.common.net.IPOrDomain via = 1;
   xray.transport.internet.StreamConfig stream_settings = 2;
-  xray.transport.internet.ProxyConfig proxy_settings = 3;
+  reserved 3;
   MultiplexingConfig multiplex_settings = 4;
   string via_cidr = 5;
   xray.transport.internet.DomainStrategy target_strategy = 6;

app/proxyman/outbound/handler.go

@@ -15,7 +15,6 @@ import (
 	"github.com/xtls/xray-core/common/errors"
 	"github.com/xtls/xray-core/common/mux"
 	"github.com/xtls/xray-core/common/net"
-	"github.com/xtls/xray-core/common/net/cnc"
 	"github.com/xtls/xray-core/common/serial"
 	"github.com/xtls/xray-core/common/session"
 	"github.com/xtls/xray-core/core"
@@ -26,8 +25,6 @@ import (
 	"github.com/xtls/xray-core/transport"
 	"github.com/xtls/xray-core/transport/internet"
 	"github.com/xtls/xray-core/transport/internet/stat"
-	"github.com/xtls/xray-core/transport/internet/tls"
-	"github.com/xtls/xray-core/transport/pipe"
 	"google.golang.org/protobuf/proto"
 )
 
@@ -63,7 +60,6 @@ type Handler struct {
 	streamSettings  *internet.MemoryStreamConfig
 	proxyConfig     proto.Message
 	proxy           proxy.Outbound
-	outboundManager outbound.Manager
 	mux             *mux.ClientManager
 	xudp            *mux.ClientManager
 	udp443          string
@@ -77,7 +73,6 @@ func NewHandler(ctx context.Context, config *core.OutboundHandlerConfig) (outbou
 	uplinkCounter, downlinkCounter := getStatCounter(v, config.Tag)
 	h := &Handler{
 		tag:             config.Tag,
-		outboundManager: v.GetFeature(outbound.ManagerType()).(outbound.Manager),
 		uplinkCounter:   uplinkCounter,
 		downlinkCounter: downlinkCounter,
 	}
@@ -108,9 +103,11 @@ func NewHandler(ctx context.Context, config *core.OutboundHandlerConfig) (outbou
 
 	ctx = session.ContextWithFullHandler(ctx, h)
 
-	newCtx := session.ContextWithStreamSettings(ctx, h.streamSettings)
+	if h.streamSettings != nil {
+		ctx = session.ContextWithStreamSettings(ctx, h.streamSettings)
+	}
 
-	rawProxyHandler, err := common.CreateObject(newCtx, proxyConfig)
+	rawProxyHandler, err := common.CreateObject(ctx, proxyConfig)
 	if err != nil {
 		return nil, err
 	}
@@ -197,7 +194,6 @@ func (h *Handler) Dispatch(ctx context.Context, link *transport.Link) {
 				common.Interrupt(link.Reader)
 				return
 			}
-
 		} else {
 			unchangedDomain := ob.Target.Address.Domain()
 			ob.Target.Address = net.IPAddress(ips[dice.Roll(len(ips))])
@@ -270,66 +266,26 @@ func (h *Handler) DestIpAddress() net.IP {
 
 // Dial implements internet.Dialer.
 func (h *Handler) Dial(ctx context.Context, dest net.Destination) (stat.Connection, error) {
-	if h.senderSettings != nil {
-
-		if h.senderSettings.ProxySettings.HasTag() {
-
-			tag := h.senderSettings.ProxySettings.Tag
-			handler := h.outboundManager.GetHandler(tag)
-			if handler != nil {
-				errors.LogDebug(ctx, "proxying to ", tag, " for dest ", dest)
-				outbounds := session.OutboundsFromContext(ctx)
-				ctx = session.ContextWithOutbounds(ctx, append(outbounds, &session.Outbound{
-					Target: dest,
-					Tag:    tag,
-				})) // add another outbound in session ctx
-				opts := pipe.OptionsFromContext(ctx)
-				uplinkReader, uplinkWriter := pipe.New(opts...)
-				downlinkReader, downlinkWriter := pipe.New(opts...)
-
-				go handler.Dispatch(ctx, &transport.Link{Reader: uplinkReader, Writer: downlinkWriter})
-				conn := cnc.NewConnection(cnc.ConnectionInputMulti(uplinkWriter), cnc.ConnectionOutputMulti(downlinkReader))
-
-				if config := tls.ConfigFromStreamSettings(h.streamSettings); config != nil {
-					tlsConfig := config.GetTLSConfig(tls.WithDestination(dest))
-					conn = tls.Client(conn, tlsConfig)
-				}
-
-				return h.getStatCouterConnection(conn), nil
-			}
-
-			errors.LogError(ctx, "failed to get outbound handler with tag: ", tag)
-			return nil, errors.New("failed to get outbound handler with tag: " + tag)
-		}
-
-		if h.senderSettings.Via != nil {
-			outbounds := session.OutboundsFromContext(ctx)
-			ob := outbounds[len(outbounds)-1]
-			h.SetOutboundGateway(ctx, ob)
-		}
+	if h.senderSettings != nil && h.senderSettings.Via != nil {
+		outbounds := session.OutboundsFromContext(ctx)
+		ob := outbounds[len(outbounds)-1]
+		h.SetOutboundGateway(ctx, ob)
 	}
 
 	conn, err := internet.Dial(ctx, dest, h.streamSettings)
 	conn = h.getStatCouterConnection(conn)
-	outbounds := session.OutboundsFromContext(ctx)
-	if outbounds != nil {
-		ob := outbounds[len(outbounds)-1]
-		ob.Conn = conn
-	} else {
-		// for Vision's pre-connect
-	}
 	return conn, err
 }
 
 func (h *Handler) SetOutboundGateway(ctx context.Context, ob *session.Outbound) {
-	if ob.Gateway == nil && h.senderSettings != nil && h.senderSettings.Via != nil && !h.senderSettings.ProxySettings.HasTag() && (h.streamSettings.SocketSettings == nil || len(h.streamSettings.SocketSettings.DialerProxy) == 0) {
+	if ob.Gateway == nil && h.senderSettings != nil && h.senderSettings.Via != nil &&
+		(h.streamSettings.SocketSettings == nil || len(h.streamSettings.SocketSettings.DialerProxy) == 0) {
 		var domain string
 		addr := h.senderSettings.Via.AsAddress()
 		domain = h.senderSettings.Via.GetDomain()
 		switch {
 		case h.senderSettings.ViaCidr != "":
 			ob.Gateway = ParseRandomIP(addr, h.senderSettings.ViaCidr)
-
 		case domain == "origin":
 			if inbound := session.InboundFromContext(ctx); inbound != nil {
 				if inbound.Local.IsValid() && inbound.Local.Address.Family().IsIP() {
@@ -344,12 +300,9 @@ func (h *Handler) SetOutboundGateway(ctx context.Context, ob *session.Outbound)
 					errors.LogDebug(ctx, "use inbound source ip as sendthrough: ", inbound.Source.Address.String())
 				}
 			}
-		// case addr.Family().IsDomain():
-		default:
+		default: // case addr.Family().IsDomain():
 			ob.Gateway = addr
-
 		}
-
 	}
 }
 

app/router/balancing.go

@@ -136,7 +136,7 @@ func (b *Balancer) SelectOutbounds() ([]string, error) {
 
 // GetPrincipleTarget implements routing.BalancerPrincipleTarget
 func (r *Router) GetPrincipleTarget(tag string) ([]string, error) {
-	if b, ok := r.balancers[tag]; ok {
+	if b, ok := (*r.balancers.Load())[tag]; ok {
 		if s, ok := b.strategy.(BalancingPrincipleTarget); ok {
 			candidates, err := b.SelectOutbounds()
 			if err != nil {
@@ -151,7 +151,7 @@ func (r *Router) GetPrincipleTarget(tag string) ([]string, error) {
 
 // SetOverrideTarget implements routing.BalancerOverrider
 func (r *Router) SetOverrideTarget(tag, target string) error {
-	if b, ok := r.balancers[tag]; ok {
+	if b, ok := (*r.balancers.Load())[tag]; ok {
 		b.override.Put(target)
 		return nil
 	}
@@ -160,7 +160,7 @@ func (r *Router) SetOverrideTarget(tag, target string) error {
 
 // GetOverrideTarget implements routing.BalancerOverrider
 func (r *Router) GetOverrideTarget(tag string) (string, error) {
-	if b, ok := r.balancers[tag]; ok {
+	if b, ok := (*r.balancers.Load())[tag]; ok {
 		return b.override.Get(), nil
 	}
 	return "", errors.New("cannot find tag")

app/router/balancing_override.go

@@ -2,25 +2,8 @@ package router
 
 import (
 	sync "sync"
-
-	"github.com/xtls/xray-core/common/errors"
 )
 
-func (r *Router) OverrideBalancer(balancer string, target string) error {
-	var b *Balancer
-	for tag, bl := range r.balancers {
-		if tag == balancer {
-			b = bl
-			break
-		}
-	}
-	if b == nil {
-		return errors.New("balancer '", balancer, "' not found")
-	}
-	b.override.Put(target)
-	return nil
-}
-
 type overrideSettings struct {
 	target string
 }

app/router/condition.go

@@ -5,6 +5,7 @@ import (
 	"os"
 	"path/filepath"
 	"regexp"
+	"runtime"
 	"slices"
 	"strings"
 
@@ -393,3 +394,22 @@ func (m *ProcessNameMatcher) Apply(ctx routing.Context) bool {
 	}
 	return false
 }
+
+// LocalOSMatcher matches the operating system Xray itself is running on. That never
+// changes while Xray is running, so the result is resolved when the rule is built.
+type LocalOSMatcher struct {
+	matched bool
+}
+
+func NewLocalOSMatcher(names []string) *LocalOSMatcher {
+	return &LocalOSMatcher{
+		matched: slices.ContainsFunc(names, func(name string) bool {
+			return strings.EqualFold(name, runtime.GOOS)
+		}),
+	}
+}
+
+// Apply implements Condition.
+func (m *LocalOSMatcher) Apply(_ routing.Context) bool {
+	return m.matched
+}

app/router/condition_test.go

@@ -2,7 +2,9 @@ package router_test
 
 import (
 	"path/filepath"
+	"runtime"
 	"strconv"
+	"strings"
 	"testing"
 
 	. "github.com/xtls/xray-core/app/router"
@@ -343,6 +345,31 @@ func TestChinaSites(t *testing.T) {
 	}
 }
 
+func TestLocalOSRule(t *testing.T) {
+	otherOS := "plan9"
+	if runtime.GOOS == otherOS {
+		otherOS = "linux"
+	}
+
+	cases := []struct {
+		localOS []string
+		output  bool
+	}{
+		{localOS: []string{runtime.GOOS}, output: true},
+		{localOS: []string{otherOS}, output: false},
+		{localOS: []string{otherOS, runtime.GOOS}, output: true},
+		{localOS: []string{strings.ToUpper(runtime.GOOS)}, output: true},
+	}
+
+	for _, test := range cases {
+		cond, err := (&RoutingRule{LocalOs: test.localOS}).BuildCondition()
+		common.Must(err)
+		if got := cond.Apply(withBackground()); got != test.output {
+			t.Errorf("for localOS %v on %s: expected %v, got %v", test.localOS, runtime.GOOS, test.output, got)
+		}
+	}
+}
+
 func BenchmarkMphDomainMatcher(b *testing.B) {
 	b.Setenv("xray.location.asset", filepath.Join("..", "..", "resources"))
 	rules, err := geodata.ParseDomainRules([]string{"geosite:cn"}, geodata.Domain_Substr)

app/router/config.go

@@ -33,6 +33,10 @@ func (r *Rule) Apply(ctx routing.Context) bool {
 func (rr *RoutingRule) BuildCondition() (Condition, error) {
 	conds := NewConditionChan()
 
+	if len(rr.LocalOs) > 0 {
+		conds.Add(NewLocalOSMatcher(rr.LocalOs))
+	}
+
 	if len(rr.InboundTag) > 0 {
 		conds.Add(NewInboundTagMatcher(rr.InboundTag))
 	}

app/router/config.pb.go

@@ -107,8 +107,10 @@ type RoutingRule struct {
 	VlessRouteList *net.PortList  `protobuf:"bytes,20,opt,name=vless_route_list,json=vlessRouteList,proto3" json:"vless_route_list,omitempty"`
 	Process        []string       `protobuf:"bytes,21,rep,name=process,proto3" json:"process,omitempty"`
 	Webhook        *WebhookConfig `protobuf:"bytes,22,opt,name=webhook,proto3" json:"webhook,omitempty"`
-	unknownFields  protoimpl.UnknownFields
-	sizeCache      protoimpl.SizeCache
+	// List of operating systems for matching the one Xray itself is running on.
+	LocalOs       []string `protobuf:"bytes,23,rep,name=local_os,json=localOs,proto3" json:"local_os,omitempty"`
+	unknownFields protoimpl.UnknownFields
+	sizeCache     protoimpl.SizeCache
 }
 
 func (x *RoutingRule) Reset() {
@@ -278,6 +280,13 @@ func (x *RoutingRule) GetWebhook() *WebhookConfig {
 	return nil
 }
 
+func (x *RoutingRule) GetLocalOs() []string {
+	if x != nil {
+		return x.LocalOs
+	}
+	return nil
+}
+
 type isRoutingRule_TargetTag interface {
 	isRoutingRule_TargetTag()
 }
@@ -578,8 +587,10 @@ type Config struct {
 	DomainStrategy Config_DomainStrategy  `protobuf:"varint,1,opt,name=domain_strategy,json=domainStrategy,proto3,enum=xray.app.router.Config_DomainStrategy" json:"domain_strategy,omitempty"`
 	Rule           []*RoutingRule         `protobuf:"bytes,2,rep,name=rule,proto3" json:"rule,omitempty"`
 	BalancingRule  []*BalancingRule       `protobuf:"bytes,3,rep,name=balancing_rule,json=balancingRule,proto3" json:"balancing_rule,omitempty"`
-	unknownFields  protoimpl.UnknownFields
-	sizeCache      protoimpl.SizeCache
+	// Absolute path to the Lua routing script.
+	Script        string `protobuf:"bytes,4,opt,name=script,proto3" json:"script,omitempty"`
+	unknownFields protoimpl.UnknownFields
+	sizeCache     protoimpl.SizeCache
 }
 
 func (x *Config) Reset() {
@@ -633,11 +644,18 @@ func (x *Config) GetBalancingRule() []*BalancingRule {
 	return nil
 }
 
+func (x *Config) GetScript() string {
+	if x != nil {
+		return x.Script
+	}
+	return ""
+}
+
 var File_app_router_config_proto protoreflect.FileDescriptor
 
 const file_app_router_config_proto_rawDesc = "" +
 	"\n" +
-	"\x17app/router/config.proto\x12\x0fxray.app.router\x1a!common/serial/typed_message.proto\x1a\x15common/net/port.proto\x1a\x18common/net/network.proto\x1a\x1bcommon/geodata/geodat.proto\"\xc1\a\n" +
+	"\x17app/router/config.proto\x12\x0fxray.app.router\x1a!common/serial/typed_message.proto\x1a\x15common/net/port.proto\x1a\x18common/net/network.proto\x1a\x1bcommon/geodata/geodat.proto\"\xdc\a\n" +
 	"\vRoutingRule\x12\x12\n" +
 	"\x03tag\x18\x01 \x01(\tH\x00R\x03tag\x12%\n" +
 	"\rbalancing_tag\x18\f \x01(\tH\x00R\fbalancingTag\x12\x19\n" +
@@ -661,7 +679,8 @@ const file_app_router_config_proto_rawDesc = "" +
 	"\x0flocal_port_list\x18\x12 \x01(\v2\x19.xray.common.net.PortListR\rlocalPortList\x12C\n" +
 	"\x10vless_route_list\x18\x14 \x01(\v2\x19.xray.common.net.PortListR\x0evlessRouteList\x12\x18\n" +
 	"\aprocess\x18\x15 \x03(\tR\aprocess\x128\n" +
-	"\awebhook\x18\x16 \x01(\v2\x1e.xray.app.router.WebhookConfigR\awebhook\x1a=\n" +
+	"\awebhook\x18\x16 \x01(\v2\x1e.xray.app.router.WebhookConfigR\awebhook\x12\x19\n" +
+	"\blocal_os\x18\x17 \x03(\tR\alocalOs\x1a=\n" +
 	"\x0fAttributesEntry\x12\x10\n" +
 	"\x03key\x18\x01 \x01(\tR\x03key\x12\x14\n" +
 	"\x05value\x18\x02 \x01(\tR\x05value:\x028\x01B\f\n" +
@@ -689,11 +708,12 @@ const file_app_router_config_proto_rawDesc = "" +
 	"\tbaselines\x18\x03 \x03(\x03R\tbaselines\x12\x1a\n" +
 	"\bexpected\x18\x04 \x01(\x05R\bexpected\x12\x16\n" +
 	"\x06maxRTT\x18\x05 \x01(\x03R\x06maxRTT\x12\x1c\n" +
-	"\ttolerance\x18\x06 \x01(\x02R\ttolerance\"\x96\x02\n" +
+	"\ttolerance\x18\x06 \x01(\x02R\ttolerance\"\xae\x02\n" +
 	"\x06Config\x12O\n" +
 	"\x0fdomain_strategy\x18\x01 \x01(\x0e2&.xray.app.router.Config.DomainStrategyR\x0edomainStrategy\x120\n" +
 	"\x04rule\x18\x02 \x03(\v2\x1c.xray.app.router.RoutingRuleR\x04rule\x12E\n" +
-	"\x0ebalancing_rule\x18\x03 \x03(\v2\x1e.xray.app.router.BalancingRuleR\rbalancingRule\"B\n" +
+	"\x0ebalancing_rule\x18\x03 \x03(\v2\x1e.xray.app.router.BalancingRuleR\rbalancingRule\x12\x16\n" +
+	"\x06script\x18\x04 \x01(\tR\x06script\"B\n" +
 	"\x0eDomainStrategy\x12\b\n" +
 	"\x04AsIs\x10\x00\x12\x10\n" +
 	"\fIpIfNonMatch\x10\x02\x12\x0e\n" +

app/router/config.proto

@@ -56,6 +56,9 @@ message RoutingRule {
 
   repeated string process = 21;
   WebhookConfig webhook = 22;
+
+  // List of operating systems for matching the one Xray itself is running on.
+  repeated string local_os = 23;
 }
 
 message WebhookConfig {
@@ -107,4 +110,6 @@ message Config {
   DomainStrategy domain_strategy = 1;
   repeated RoutingRule rule = 2;
   repeated BalancingRule balancing_rule = 3;
+  // Absolute path to the Lua routing script.
+  string script = 4;
 }

app/router/lua.go

@@ -0,0 +1,206 @@
+package router
+
+import (
+	"context"
+	"runtime"
+
+	"github.com/xtls/xray-core/common/errors"
+	"github.com/xtls/xray-core/common/net"
+	"github.com/xtls/xray-core/features/routing"
+	lua "github.com/yuin/gopher-lua"
+)
+
+const (
+	luaContextType    = "xray.router.Context"
+	luaAttributesType = "xray.router.Attributes"
+)
+
+// RegisterLua makes xray.router available to routing scripts.
+func (r *Router) RegisterLua(L *lua.LState) {
+	registerLuaContext(L)
+
+	L.PreloadModule("xray.router", func(L *lua.LState) int {
+		module := L.NewTable()
+
+		module.RawSetString("NetworkUnknown", lua.LNumber(net.Network_Unknown))
+		module.RawSetString("NetworkTCP", lua.LNumber(net.Network_TCP))
+		module.RawSetString("NetworkUDP", lua.LNumber(net.Network_UDP))
+		module.RawSetString("NetworkUNIX", lua.LNumber(net.Network_UNIX))
+		module.RawSetString("LocalOS", lua.LString(runtime.GOOS))
+
+		module.RawSetString("PickOutbound", L.NewFunction(func(L *lua.LState) int {
+			tag, ok := L.Get(2).(lua.LString)
+			if !ok {
+				L.ArgError(2, "balancer tag must be a string")
+				return 0
+			}
+			balancer, found := (*r.balancers.Load())[string(tag)]
+			if !found {
+				L.Push(lua.LNil)
+				pushLuaError(L, errors.New("balancer ", tag, " not found"))
+				return 2
+			}
+			outboundTag, err := balancer.PickOutbound()
+			L.Push(lua.LString(outboundTag))
+			pushLuaError(L, err)
+			return 2
+		}))
+
+		module.RawSetString("FindProcess", L.NewFunction(func(L *lua.LState) int {
+			pid, name, path, err := findProcess(checkLuaContext(L), net.FindProcess)
+			L.Push(lua.LNumber(pid))
+			L.Push(lua.LString(name))
+			L.Push(lua.LString(path))
+			pushLuaError(L, err)
+			return 4
+		}))
+
+		L.Push(module)
+		return 1
+	})
+}
+
+func registerLuaContext(L *lua.LState) {
+	attributes := L.NewTypeMetatable(luaAttributesType)
+	L.SetField(attributes, "__index", L.NewFunction(func(L *lua.LState) int {
+		values := L.CheckUserData(1).Value.(map[string]string)
+		key := L.CheckString(2)
+		if value, found := values[key]; found {
+			L.Push(lua.LString(value))
+		} else {
+			L.Push(lua.LNil)
+		}
+		return 1
+	}))
+	methods := L.NewTable()
+	L.SetFuncs(methods, map[string]lua.LGFunction{
+		"GetSourceIPs": func(L *lua.LState) int {
+			return pushLuaIPs(L, checkLuaContext(L).GetSourceIPs())
+		},
+		"GetTargetIPs": func(L *lua.LState) int {
+			return pushLuaIPs(L, checkLuaContext(L).GetTargetIPs())
+		},
+		"GetLocalIPs": func(L *lua.LState) int {
+			return pushLuaIPs(L, checkLuaContext(L).GetLocalIPs())
+		},
+		"GetAttributes": func(L *lua.LState) int {
+			values := L.NewUserData()
+			values.Value = checkLuaContext(L).GetAttributes()
+			L.SetMetatable(values, attributes)
+			L.Push(values)
+			return 1
+		},
+	})
+	L.SetField(L.NewTypeMetatable(luaContextType), "__index", methods)
+}
+
+func checkLuaContext(L *lua.LState) routing.Context {
+	ctx, ok := L.CheckUserData(1).Value.(routing.Context)
+	if !ok {
+		L.ArgError(1, "routing context expected")
+	}
+	return ctx
+}
+
+func pushLuaIPs(L *lua.LState, ips []net.IP) int {
+	addresses := L.NewUserData()
+	addresses.Value = ips
+	L.Push(addresses)
+	return 1
+}
+
+func pushLuaError(L *lua.LState, err error) {
+	if err == nil {
+		L.Push(lua.LNil)
+		return
+	}
+	value := L.NewUserData()
+	value.Value = err
+	L.Push(value)
+}
+
+// CallLuaHook invokes HandleRoute in the supplied state.
+func (r *Router) CallLuaHook(L *lua.LState, ctx context.Context, routeCtx routing.Context) (string, string, error) {
+	previous, top := L.Context(), L.GetTop()
+	L.SetContext(ctx)
+	defer func() {
+		L.SetTop(top)
+		if previous == nil {
+			L.RemoveContext()
+		} else {
+			L.SetContext(previous)
+		}
+	}()
+	fn := L.GetGlobal("HandleRoute")
+	if fn.Type() != lua.LTFunction {
+		return "", "", errors.New("routing script must define HandleRoute(...)")
+	}
+	value := L.NewUserData()
+	value.Value = routeCtx
+	L.SetMetatable(value, L.GetTypeMetatable(luaContextType))
+	if err := L.CallByParam(lua.P{Fn: fn, NRet: 3, Protect: true},
+		value, lua.LString(routeCtx.GetInboundTag()), lua.LNumber(routeCtx.GetSourcePort()),
+		lua.LNumber(routeCtx.GetTargetPort()), lua.LNumber(routeCtx.GetLocalPort()),
+		lua.LString(routeCtx.GetTargetDomain()), lua.LNumber(routeCtx.GetNetwork()),
+		lua.LString(routeCtx.GetProtocol()), lua.LString(routeCtx.GetUser()),
+		lua.LNumber(routeCtx.GetVlessRoute()), lua.LBool(routeCtx.GetSkipDNSResolve())); err != nil {
+		return "", "", err
+	}
+	return readLuaRouteResult(L.Get(-3), L.Get(-2), L.Get(-1))
+}
+
+func readLuaRouteResult(tagValue, ruleValue, errorValue lua.LValue) (string, string, error) {
+	if errorValue != lua.LNil {
+		if value, ok := errorValue.(*lua.LUserData); ok {
+			if err, ok := value.Value.(error); ok {
+				return "", "", err
+			}
+		}
+		if value, ok := errorValue.(lua.LString); ok {
+			return "", "", errors.New(string(value))
+		}
+		return "", "", errors.New("routing script error must be an error or string")
+	}
+	if tagValue == lua.LNil {
+		return "", "", nil
+	}
+	tag, ok := tagValue.(lua.LString)
+	if !ok {
+		return "", "", errors.New("routing script outboundTag must be a string or nil")
+	}
+	if tag == "" {
+		return "", "", nil
+	}
+	var ruleTag string
+	if ruleValue != lua.LNil {
+		value, ok := ruleValue.(lua.LString)
+		if !ok {
+			return "", "", errors.New("routing script ruleTag must be a string")
+		}
+		ruleTag = string(value)
+	}
+	return string(tag), ruleTag, nil
+}
+
+type processFinder func(string, string, uint16, string, uint16) (int, string, string, error)
+
+func findProcess(ctx routing.Context, finder processFinder) (int, string, string, error) {
+	sources := ctx.GetSourceIPs()
+	if len(sources) == 0 {
+		return 0, "", "", errors.New("process lookup requires a source IP")
+	}
+	var network string
+	switch ctx.GetNetwork() {
+	case net.Network_TCP:
+		network = "tcp"
+	case net.Network_UDP:
+		network = "udp"
+	default:
+		return 0, "", "", errors.New("process lookup requires TCP or UDP")
+	}
+	targetIP, targetPort := "", uint16(0)
+	if targets := ctx.GetTargetIPs(); len(targets) > 0 {
+		targetIP, targetPort = targets[0].String(), uint16(ctx.GetTargetPort())
+	}
+	return finder(network, sources[0].String(), uint16(ctx.GetSourcePort()), targetIP, targetPort)
+}

app/router/lua_test.go

@@ -0,0 +1,292 @@
+package router
+
+import (
+	"context"
+	go_errors "errors"
+	"runtime"
+	"strings"
+	"testing"
+
+	"github.com/xtls/xray-core/common/geodata"
+	"github.com/xtls/xray-core/common/net"
+	"github.com/xtls/xray-core/common/protocol"
+	"github.com/xtls/xray-core/common/session"
+	"github.com/xtls/xray-core/features/routing"
+	routing_session "github.com/xtls/xray-core/features/routing/session"
+	lua "github.com/yuin/gopher-lua"
+)
+
+type luaRouteTestContext struct {
+	*routing_session.Context
+	sourceIPs, targetIPs, localIPs []net.IP
+}
+
+func (c *luaRouteTestContext) GetSourceIPs() []net.IP { return c.sourceIPs }
+func (c *luaRouteTestContext) GetTargetIPs() []net.IP { return c.targetIPs }
+func (c *luaRouteTestContext) GetLocalIPs() []net.IP  { return c.localIPs }
+
+func newLuaRouteTestContext() *luaRouteTestContext {
+	return &luaRouteTestContext{
+		Context: &routing_session.Context{
+			Inbound: &session.Inbound{
+				Tag: "in", VlessRoute: 4321,
+				Source: net.TCPDestination(net.LocalHostIP, 1234),
+				Local:  net.TCPDestination(net.LocalHostIP, 5678),
+				User:   &protocol.MemoryUser{Email: "user@example.com"},
+			},
+			Outbound: &session.Outbound{
+				Target:      net.TCPDestination(net.LocalHostIP, 443),
+				RouteTarget: net.TCPDestination(net.DomainAddress("MiXeD.Example."), 443),
+			},
+			Content: &session.Content{
+				Protocol: "tls", Attributes: map[string]string{"key": "value"}, SkipDNSResolve: true,
+			},
+		},
+		sourceIPs: []net.IP{{127, 0, 0, 2}},
+		targetIPs: []net.IP{{127, 0, 0, 3}},
+		localIPs:  []net.IP{{127, 0, 0, 1}},
+	}
+}
+
+func newLuaRouterState(t *testing.T, script string) (*Router, *lua.LState) {
+	t.Helper()
+	r := new(Router)
+	if err := r.Init(context.Background(), &Config{}, nil, nil, nil); err != nil {
+		t.Fatal(err)
+	}
+	L := lua.NewState()
+	t.Cleanup(L.Close)
+	r.RegisterLua(L)
+	geodata.RegisterLua(L)
+	if err := L.DoString(script); err != nil {
+		t.Fatal(err)
+	}
+	return r, L
+}
+
+func TestLuaRouteBinding(t *testing.T) {
+	r, L := newLuaRouterState(t, `
+local router = require("xray.router")
+local matcher = require("xray.geodata").BuildIPMatcher("127.0.0.0/8")
+assert(router.NetworkUnknown == 0 and router.NetworkTCP == 2)
+assert(router.NetworkUDP == 3 and router.NetworkUNIX == 4)
+assert(router.BuildIPMatcher == nil and router.BuildDomainMatcher == nil)
+function HandleRoute(ctx, inboundTag, sourcePort, targetPort, localPort,
+    targetDomain, network, protocol, user, vlessRoute, skipDNSResolve, ...)
+    assert(select("#", ...) == 0)
+    assert(inboundTag == "in" and sourcePort == 1234 and targetPort == 443 and localPort == 5678)
+    assert(targetDomain == "MiXeD.Example." and network == router.NetworkTCP)
+    assert(protocol == "tls" and user == "user@example.com" and vlessRoute == 4321 and skipDNSResolve)
+    assert(ctx.GetNetwork == nil and ctx.Context == nil)
+    savedContext = ctx
+    sourceIPs, targetIPs, localIPs = ctx:GetSourceIPs(), ctx:GetTargetIPs(), ctx:GetLocalIPs()
+    attributes = ctx:GetAttributes()
+    assert(matcher:AnyMatch(sourceIPs) and matcher:AnyMatch(targetIPs) and matcher:AnyMatch(localIPs))
+    assert(attributes.key == "value" and attributes.missing == nil)
+    assert(not pcall(function() attributes.key = "changed" end))
+    return "out", "rule"
+end`)
+
+	ctx := newLuaRouteTestContext()
+	tag, rule, err := r.CallLuaHook(L, context.Background(), ctx)
+	if err != nil || tag != "out" || rule != "rule" {
+		t.Fatalf("hook = %q, %q, %v", tag, rule, err)
+	}
+	if L.GetGlobal("savedContext").(*lua.LUserData).Value != ctx {
+		t.Fatal("routing context was copied")
+	}
+	for _, tc := range []struct {
+		name string
+		want []net.IP
+	}{
+		{"sourceIPs", ctx.sourceIPs},
+		{"targetIPs", ctx.targetIPs},
+		{"localIPs", ctx.localIPs},
+	} {
+		got := L.GetGlobal(tc.name).(*lua.LUserData).Value.([]net.IP)
+		if &got[0] != &tc.want[0] {
+			t.Fatalf("%s storage was copied", tc.name)
+		}
+	}
+	ctx.Content.Attributes["key"] = "updated"
+	L.SetGlobal("expectedOS", lua.LString(runtime.GOOS))
+	if err := L.DoString(`
+assert(attributes.key == "updated")
+assert(require("xray.router").LocalOS == expectedOS)`); err != nil {
+		t.Fatal(err)
+	}
+}
+
+func TestLuaRouteResult(t *testing.T) {
+	nativeErr := go_errors.New("native failure")
+	for _, tc := range []struct {
+		name, body, tag, rule, wantErr string
+		native                         bool
+	}{
+		{name: "route", body: `return "out", "rule"`, tag: "out", rule: "rule"},
+		{name: "no match", body: `return nil`},
+		{name: "empty tag", body: `return ""`},
+		{name: "invalid tag", body: `return 1`, wantErr: "outboundTag"},
+		{name: "invalid rule", body: `return "out", false`, wantErr: "ruleTag"},
+		{name: "string error", body: `return nil, nil, "script failure"`, wantErr: "script failure"},
+		{name: "native error", body: `return nil, nil, nativeError`, native: true},
+		{name: "runtime error", body: `error("runtime failure")`, wantErr: "runtime failure"},
+	} {
+		t.Run(tc.name, func(t *testing.T) {
+			r, L := newLuaRouterState(t, "function HandleRoute() "+tc.body+" end")
+			value := L.NewUserData()
+			value.Value = nativeErr
+			L.SetGlobal("nativeError", value)
+			previous := context.WithValue(context.Background(), struct{}{}, true)
+			L.SetContext(previous)
+			L.Push(lua.LTrue)
+
+			tag, rule, err := r.CallLuaHook(L, context.Background(), &routing_session.Context{})
+			if tag != tc.tag || rule != tc.rule {
+				t.Fatalf("result = %q, %q, %v", tag, rule, err)
+			}
+			switch {
+			case tc.native:
+				if err != nativeErr {
+					t.Fatalf("error = %v, want original error", err)
+				}
+			case tc.wantErr != "":
+				if err == nil || !strings.Contains(err.Error(), tc.wantErr) {
+					t.Fatalf("error = %v, want %q", err, tc.wantErr)
+				}
+			case err != nil:
+				t.Fatal(err)
+			}
+			if L.Context() != previous || L.GetTop() != 1 || L.Get(1) != lua.LTrue {
+				t.Fatal("hook did not restore the previous context and stack")
+			}
+		})
+	}
+}
+
+func TestLuaRouteCancellation(t *testing.T) {
+	r, L := newLuaRouterState(t, `function HandleRoute() while true do end end`)
+	ctx, cancel := context.WithCancel(context.Background())
+	cancel()
+	if _, _, err := r.CallLuaHook(L, ctx, &routing_session.Context{}); err == nil {
+		t.Fatal("CallLuaHook did not stop after context cancellation")
+	}
+	if L.Context() != nil || L.GetTop() != 0 {
+		t.Fatal("CallLuaHook did not restore the Lua state")
+	}
+}
+
+func TestFindProcess(t *testing.T) {
+	for _, tc := range []struct {
+		name, network, target string
+		targetPort            uint16
+		modify                func(*luaRouteTestContext)
+		wantErr               bool
+	}{
+		{name: "TCP", network: "tcp", target: "127.0.0.3", targetPort: 443},
+		{name: "UDP", network: "udp", target: "127.0.0.3", targetPort: 443, modify: func(c *luaRouteTestContext) {
+			c.Outbound.Target.Network = net.Network_UDP
+		}},
+		{name: "domain target", network: "tcp", modify: func(c *luaRouteTestContext) { c.targetIPs = nil }},
+		{name: "missing source", modify: func(c *luaRouteTestContext) { c.sourceIPs = nil }, wantErr: true},
+		{name: "unsupported network", modify: func(c *luaRouteTestContext) {
+			c.Outbound.Target.Network = net.Network_UNIX
+		}, wantErr: true},
+	} {
+		t.Run(tc.name, func(t *testing.T) {
+			ctx := newLuaRouteTestContext()
+			if tc.modify != nil {
+				tc.modify(ctx)
+			}
+			called := false
+			pid, name, path, err := findProcess(ctx, func(network, source string, sourcePort uint16, target string, targetPort uint16) (int, string, string, error) {
+				called = true
+				if network != tc.network || source != "127.0.0.2" || sourcePort != 1234 || target != tc.target || targetPort != tc.targetPort {
+					t.Fatalf("endpoints = %s %s:%d -> %s:%d", network, source, sourcePort, target, targetPort)
+				}
+				return 42, "process", "/path/process", nil
+			})
+			if tc.wantErr {
+				if err == nil || called {
+					t.Fatalf("findProcess = %d, %q, %q, %v", pid, name, path, err)
+				}
+				return
+			}
+			if err != nil || !called || pid != 42 || name != "process" || path != "/path/process" {
+				t.Fatalf("findProcess = %d, %q, %q, %v", pid, name, path, err)
+			}
+		})
+	}
+}
+
+// BenchmarkLuaRouteHookCall isolates a preloaded Lua hook and its routing context bridge.
+// The direct case runs an equivalent native routing rule.
+func BenchmarkLuaRouteHookCall(b *testing.B) {
+	r := new(Router)
+	if err := r.Init(context.Background(), &Config{Rule: []*RoutingRule{{
+		TargetTag:  &RoutingRule_Tag{Tag: "out"},
+		RuleTag:    "rule",
+		InboundTag: []string{"in"},
+		Networks:   []net.Network{net.Network_TCP},
+		Ip: []*geodata.IPRule{{
+			Value: &geodata.IPRule_Custom{Custom: &geodata.CIDRRule{
+				Cidr: &geodata.CIDR{Ip: []byte{127, 0, 0, 0}, Prefix: 8},
+			}},
+		}},
+	}}}, nil, nil, nil); err != nil {
+		b.Fatal(err)
+	}
+	L := lua.NewState()
+	defer L.Close()
+	r.RegisterLua(L)
+	geodata.RegisterLua(L)
+	if err := L.DoString(`
+local router = require("xray.router")
+local matcher = require("xray.geodata").BuildIPMatcher("127.0.0.0/8")
+function HandleRoute(ctx, inboundTag, sourcePort, targetPort, localPort,
+    targetDomain, network, protocol, user, vlessRoute, skipDNSResolve)
+    if inboundTag == "in" and network == router.NetworkTCP and matcher:AnyMatch(ctx:GetTargetIPs()) then
+        return "out", "rule"
+    end
+end
+`); err != nil {
+		b.Fatal(err)
+	}
+
+	ctx := context.Background()
+	routeCtx := newLuaRouteTestContext()
+	for _, benchmark := range []struct {
+		name  string
+		route func() (string, string, error)
+	}{
+		{"direct", func() (string, string, error) {
+			route, err := r.PickRoute(routeCtx)
+			if err != nil {
+				return "", "", err
+			}
+			return route.GetOutboundTag(), route.GetRuleTag(), nil
+		}},
+		{"lua_hook", func() (string, string, error) {
+			return r.CallLuaHook(L, ctx, routeCtx)
+		}},
+	} {
+		b.Run(benchmark.name, func(b *testing.B) {
+			b.ReportAllocs()
+			b.ResetTimer()
+			var tag, rule string
+			var err error
+			for i := 0; i < b.N; i++ {
+				tag, rule, err = benchmark.route()
+				if err != nil {
+					b.Fatal(err)
+				}
+			}
+			b.StopTimer()
+			if tag != "out" || rule != "rule" {
+				b.Fatalf("route() = %q, %q; want out, rule", tag, rule)
+			}
+		})
+	}
+}
+
+var _ routing.Context = (*luaRouteTestContext)(nil)

app/router/router.go

@@ -2,7 +2,9 @@ package router
 
 import (
 	"context"
+	"maps"
 	"sync"
+	"sync/atomic"
 
 	"github.com/xtls/xray-core/common"
 	"github.com/xtls/xray-core/common/errors"
@@ -17,8 +19,10 @@ import (
 // Router is an implementation of routing.Router.
 type Router struct {
 	domainStrategy Config_DomainStrategy
-	rules          []*Rule
-	balancers      map[string]*Balancer
+	rules          atomic.Pointer[[]*Rule]
+	scriptPath     string
+	script         *scriptEngine
+	balancers      atomic.Pointer[map[string]*Balancer]
 	dns            dns.Client
 
 	ctx        context.Context
@@ -38,61 +42,23 @@ type Route struct {
 // Init initializes the Router.
 func (r *Router) Init(ctx context.Context, config *Config, d dns.Client, ohm outbound.Manager, dispatcher routing.Dispatcher) error {
 	r.domainStrategy = config.DomainStrategy
+	r.scriptPath = config.Script
 	r.dns = d
 	r.ctx = ctx
 	r.ohm = ohm
 	r.dispatcher = dispatcher
 
-	r.balancers = make(map[string]*Balancer, len(config.BalancingRule))
-	for _, rule := range config.BalancingRule {
-		balancer, err := rule.Build(ohm, dispatcher)
-		if err != nil {
-			return err
-		}
-		balancer.InjectContext(ctx)
-		r.balancers[rule.Tag] = balancer
-	}
-
-	r.rules = make([]*Rule, 0, len(config.Rule))
-	for _, rule := range config.Rule {
-		cond, err := rule.BuildCondition()
-		if err != nil {
-			r.closeWebhooks()
-			return err
-		}
-		rr := &Rule{
-			Condition: cond,
-			Tag:       rule.GetTag(),
-			RuleTag:   rule.GetRuleTag(),
-		}
-		if wh := rule.GetWebhook(); wh != nil {
-			notifier, err := NewWebhookNotifier(wh)
-			if err != nil {
-				r.closeWebhooks()
-				return err
-			}
-			rr.Webhook = notifier
-		}
-		btag := rule.GetBalancingTag()
-		if len(btag) > 0 {
-			brule, found := r.balancers[btag]
-			if !found {
-				if rr.Webhook != nil {
-					rr.Webhook.Close()
-				}
-				r.closeWebhooks()
-				return errors.New("balancer ", btag, " not found")
-			}
-			rr.Balancer = brule
-		}
-		r.rules = append(r.rules, rr)
-	}
-
-	return nil
+	r.rules.Store(new([]*Rule))
+	r.balancers.Store(&map[string]*Balancer{})
+	return r.ReloadRules(config, false)
 }
 
 // PickRoute implements routing.Router.
 func (r *Router) PickRoute(ctx routing.Context) (routing.Route, error) {
+	if r.script != nil {
+		return r.script.pickRoute(ctx)
+	}
+
 	originalCtx := ctx
 	rule, ctx, err := r.pickRouteInternal(ctx)
 	if err != nil {
@@ -124,18 +90,22 @@ func (r *Router) ReloadRules(config *Config, shouldAppend bool) error {
 	r.mu.Lock()
 	defer r.mu.Unlock()
 
-	if !shouldAppend {
-		for _, rule := range r.rules {
-			if rule.Webhook != nil {
-				rule.Webhook.Close()
-			}
+	oldRules := *r.rules.Load()
+	oldBalancers := *r.balancers.Load()
+
+	var newRules []*Rule
+	newBalancers := make(map[string]*Balancer)
+	existTags := make(map[string]bool, len(oldRules)+len(config.Rule))
+	if shouldAppend {
+		newRules = append(newRules, oldRules...)
+		maps.Copy(newBalancers, oldBalancers)
+		for _, rule := range oldRules {
+			existTags[rule.RuleTag] = true
 		}
-		r.balancers = make(map[string]*Balancer, len(config.BalancingRule))
-		r.rules = make([]*Rule, 0, len(config.Rule))
 	}
+
 	for _, rule := range config.BalancingRule {
-		_, found := r.balancers[rule.Tag]
-		if found {
+		if _, found := newBalancers[rule.Tag]; found {
 			return errors.New("duplicate balancer tag")
 		}
 		balancer, err := rule.Build(r.ohm, r.dispatcher)
@@ -143,27 +113,12 @@ func (r *Router) ReloadRules(config *Config, shouldAppend bool) error {
 			return err
 		}
 		balancer.InjectContext(r.ctx)
-		r.balancers[rule.Tag] = balancer
-	}
-
-	startIdx := len(r.rules)
-	closeNewWebhooks := func() {
-		for i := startIdx; i < len(r.rules); i++ {
-			if r.rules[i].Webhook != nil {
-				r.rules[i].Webhook.Close()
-			}
-		}
-		r.rules = r.rules[:startIdx]
+		newBalancers[rule.Tag] = balancer
 	}
 
 	for _, rule := range config.Rule {
-		if r.RuleExists(rule.GetRuleTag()) {
-			closeNewWebhooks()
-			return errors.New("duplicate ruleTag ", rule.GetRuleTag())
-		}
 		cond, err := rule.BuildCondition()
 		if err != nil {
-			closeNewWebhooks()
 			return err
 		}
 		rr := &Rule{
@@ -171,69 +126,64 @@ func (r *Router) ReloadRules(config *Config, shouldAppend bool) error {
 			Tag:       rule.GetTag(),
 			RuleTag:   rule.GetRuleTag(),
 		}
+		if rr.RuleTag != "" && existTags[rr.RuleTag] {
+			return errors.New("duplicate ruleTag ", rr.RuleTag)
+		}
+		existTags[rr.RuleTag] = true
 		if wh := rule.GetWebhook(); wh != nil {
 			notifier, err := NewWebhookNotifier(wh)
 			if err != nil {
-				closeNewWebhooks()
 				return err
 			}
 			rr.Webhook = notifier
 		}
-		btag := rule.GetBalancingTag()
-		if len(btag) > 0 {
-			brule, found := r.balancers[btag]
+		if btag := rule.GetBalancingTag(); len(btag) > 0 {
+			brule, found := newBalancers[btag]
 			if !found {
-				if rr.Webhook != nil {
-					rr.Webhook.Close()
-				}
-				closeNewWebhooks()
 				return errors.New("balancer ", btag, " not found")
 			}
 			rr.Balancer = brule
 		}
-		r.rules = append(r.rules, rr)
+		newRules = append(newRules, rr)
 	}
 
+	r.balancers.Store(&newBalancers)
+	r.rules.Store(&newRules)
+	if !shouldAppend {
+		closeWebhooks(oldRules)
+	}
 	return nil
 }
 
-func (r *Router) RuleExists(tag string) bool {
-	if tag != "" {
-		for _, rule := range r.rules {
-			if rule.RuleTag == tag {
-				return true
-			}
-		}
-	}
-	return false
-}
-
 // RemoveRule implements routing.Router.
 func (r *Router) RemoveRule(tag string) error {
+	if tag == "" {
+		return errors.New("empty tag name!")
+	}
+
 	r.mu.Lock()
 	defer r.mu.Unlock()
 
-	newRules := []*Rule{}
-	if tag != "" {
-		for _, rule := range r.rules {
-			if rule.RuleTag != tag {
-				newRules = append(newRules, rule)
-			} else if rule.Webhook != nil {
-				rule.Webhook.Close()
-			}
+	oldRules := *r.rules.Load()
+	newRules := make([]*Rule, 0, len(oldRules))
+	var removed []*Rule
+	for _, rule := range oldRules {
+		if rule.RuleTag != tag {
+			newRules = append(newRules, rule)
+		} else {
+			removed = append(removed, rule)
 		}
-		r.rules = newRules
-		return nil
 	}
-	return errors.New("empty tag name!")
+	r.rules.Store(&newRules)
+	closeWebhooks(removed)
+	return nil
 }
 
 // ListRule implements routing.Router
 func (r *Router) ListRule() []routing.Route {
-	r.mu.Lock()
-	defer r.mu.Unlock()
-	ruleList := make([]routing.Route, 0)
-	for _, rule := range r.rules {
+	rules := *r.rules.Load()
+	ruleList := make([]routing.Route, 0, len(rules))
+	for _, rule := range rules {
 		ruleList = append(ruleList, &Route{
 			outboundTag: rule.Tag,
 			ruleTag:     rule.RuleTag,
@@ -252,7 +202,9 @@ func (r *Router) pickRouteInternal(ctx routing.Context) (*Rule, routing.Context,
 		ctx = routing_dns.ContextWithDNSClient(ctx, r.dns)
 	}
 
-	for _, rule := range r.rules {
+	rules := *r.rules.Load()
+
+	for _, rule := range rules {
 		if rule.Apply(ctx) {
 			return rule, ctx, nil
 		}
@@ -265,7 +217,7 @@ func (r *Router) pickRouteInternal(ctx routing.Context) (*Rule, routing.Context,
 	ctx = routing_dns.ContextWithDNSClient(ctx, r.dns)
 
 	// Try applying rules again if we have IPs.
-	for _, rule := range r.rules {
+	for _, rule := range rules {
 		if rule.Apply(ctx) {
 			return rule, ctx, nil
 		}
@@ -276,12 +228,19 @@ func (r *Router) pickRouteInternal(ctx routing.Context) (*Rule, routing.Context,
 
 // Start implements common.Runnable.
 func (r *Router) Start() error {
+	if r.scriptPath != "" {
+		engine, err := newScriptEngine(r.scriptPath, r)
+		if err != nil {
+			return errors.New("failed to initialize routing script").Base(err)
+		}
+		r.script = engine
+	}
 	return nil
 }
 
-// closeWebhooks closes all webhook notifiers in the current rule set.
-func (r *Router) closeWebhooks() {
-	for _, rule := range r.rules {
+// closeWebhooks closes all webhook notifiers in the given rule set.
+func closeWebhooks(rules []*Rule) {
+	for _, rule := range rules {
 		if rule.Webhook != nil {
 			rule.Webhook.Close()
 		}
@@ -290,9 +249,12 @@ func (r *Router) closeWebhooks() {
 
 // Close implements common.Closable.
 func (r *Router) Close() error {
+	if r.script != nil {
+		r.script.close()
+	}
 	r.mu.Lock()
 	defer r.mu.Unlock()
-	r.closeWebhooks()
+	closeWebhooks(*r.rules.Load())
 	return nil
 }
 

app/router/script.go

@@ -0,0 +1,79 @@
+package router
+
+import (
+	"context"
+	"time"
+
+	"github.com/xtls/xray-core/app/dns"
+	"github.com/xtls/xray-core/common"
+	"github.com/xtls/xray-core/common/errors"
+	"github.com/xtls/xray-core/common/geodata"
+	"github.com/xtls/xray-core/common/log"
+	luamgr "github.com/xtls/xray-core/common/lua"
+	"github.com/xtls/xray-core/features/routing"
+	lua "github.com/yuin/gopher-lua"
+)
+
+const scriptExecutionTimeout = 10 * time.Second
+
+type scriptEngine struct {
+	router *Router
+	pool   *luamgr.Pool
+}
+
+func newScriptEngine(path string, router *Router) (*scriptEngine, error) {
+	program, err := luamgr.CompileFile(path)
+	if err != nil {
+		return nil, err
+	}
+	e := &scriptEngine{router: router}
+	e.pool, err = luamgr.NewPool(router.ctx, func(poolCtx context.Context) (*lua.LState, error) {
+		initCtx, cancel := context.WithTimeout(poolCtx, scriptExecutionTimeout)
+		defer cancel()
+		L, err := program.NewState(initCtx, func(L *lua.LState) {
+			geodata.RegisterLua(L)
+			log.RegisterLua(L)
+			router.RegisterLua(L)
+			dns.RegisterLua(L, router.dns)
+		})
+		if err != nil {
+			return nil, err
+		}
+		if L.GetGlobal("HandleRoute").Type() != lua.LTFunction {
+			L.Close()
+			return nil, errors.New("routing script must define HandleRoute(...)")
+		}
+		return L, nil
+	})
+	if err != nil {
+		return nil, err
+	}
+	errors.LogInfo(router.ctx, "routing script initialized from ", path)
+	return e, nil
+}
+
+func (e *scriptEngine) close() {
+	e.pool.Close()
+}
+
+func (e *scriptEngine) pickRoute(ctx routing.Context) (routing.Route, error) {
+	L, err := e.pool.Acquire()
+	if err != nil {
+		return nil, err
+	}
+	reusable := false
+	defer func() {
+		e.pool.Release(L, reusable)
+	}()
+	callCtx, cancel := context.WithTimeout(e.pool.Context(), scriptExecutionTimeout)
+	defer cancel()
+	tag, ruleTag, err := e.router.CallLuaHook(L, callCtx, ctx)
+	if err != nil {
+		return nil, err
+	}
+	reusable = true
+	if tag == "" {
+		return nil, common.ErrNoClue
+	}
+	return &Route{Context: ctx, outboundTag: tag, ruleTag: ruleTag}, nil
+}

app/router/script_test.go

@@ -0,0 +1,372 @@
+package router
+
+import (
+	"context"
+	stdnet "net"
+	"os"
+	"path/filepath"
+	"sync"
+	"sync/atomic"
+	"testing"
+	"time"
+
+	wireDNS "github.com/miekg/dns"
+	"github.com/xtls/xray-core/app/dispatcher"
+	appdns "github.com/xtls/xray-core/app/dns"
+	"github.com/xtls/xray-core/app/proxyman"
+	_ "github.com/xtls/xray-core/app/proxyman/outbound"
+	"github.com/xtls/xray-core/common"
+	"github.com/xtls/xray-core/common/net"
+	"github.com/xtls/xray-core/common/serial"
+	"github.com/xtls/xray-core/core"
+	featureDNS "github.com/xtls/xray-core/features/dns"
+	"github.com/xtls/xray-core/features/outbound"
+	"github.com/xtls/xray-core/features/routing"
+	routing_session "github.com/xtls/xray-core/features/routing/session"
+	"github.com/xtls/xray-core/proxy/blackhole"
+	"github.com/xtls/xray-core/proxy/freedom"
+)
+
+type luaRouteDNSClient struct {
+	featureDNS.Client
+	lookup func(string, featureDNS.IPOption) ([]net.IP, uint32, error)
+}
+
+func (d *luaRouteDNSClient) LookupIP(domain string, option featureDNS.IPOption) ([]net.IP, uint32, error) {
+	return d.lookup(domain, option)
+}
+
+type luaRouteOutboundManager struct{ outbound.Manager }
+
+func (*luaRouteOutboundManager) Select(selectors []string) []string { return selectors }
+
+func writeRouteScript(t *testing.T, script string) string {
+	t.Helper()
+	path := filepath.Join(t.TempDir(), "route.lua")
+	if err := os.WriteFile(path, []byte(script), 0o600); err != nil {
+		t.Fatal(err)
+	}
+	return path
+}
+
+func startLuaRouter(t *testing.T, script string, d featureDNS.Client, config *Config) *Router {
+	t.Helper()
+	if config == nil {
+		config = &Config{}
+	}
+	config.Script = writeRouteScript(t, script)
+	r := new(Router)
+	if err := r.Init(context.Background(), config, d, &luaRouteOutboundManager{}, nil); err != nil {
+		t.Fatal(err)
+	}
+	if err := r.Start(); err != nil {
+		t.Fatal(err)
+	}
+	t.Cleanup(func() {
+		if err := r.Close(); err != nil {
+			t.Error(err)
+		}
+	})
+	return r
+}
+
+func TestRouterScriptStartup(t *testing.T) {
+	for _, tc := range []struct{ name, script string }{
+		{"syntax error", "function HandleRoute("},
+		{"missing hook", "value = 1"},
+		{"initialization error", `error("setup failed")`},
+	} {
+		t.Run(tc.name, func(t *testing.T) {
+			r := new(Router)
+			if err := r.Init(context.Background(), &Config{Script: writeRouteScript(t, tc.script)}, nil, nil, nil); err != nil {
+				t.Fatal(err)
+			}
+			defer r.Close()
+			if err := r.Start(); err == nil {
+				t.Fatal("Start accepted an invalid routing script")
+			}
+		})
+	}
+}
+
+func TestRouterScriptRouting(t *testing.T) {
+	var dnsCalls atomic.Int32
+	d := &luaRouteDNSClient{lookup: func(string, featureDNS.IPOption) ([]net.IP, uint32, error) {
+		dnsCalls.Add(1)
+		return []net.IP{{1, 2, 3, 4}}, 60, nil
+	}}
+	r := startLuaRouter(t, `
+function HandleRoute(ctx, inbound)
+    if inbound == "miss" then return nil end
+    return "lua-out", "lua-rule"
+end`, d, &Config{
+		DomainStrategy: Config_IpOnDemand,
+		Rule: []*RoutingRule{{
+			TargetTag: &RoutingRule_Tag{Tag: "json-out"},
+			Networks:  []net.Network{net.Network_TCP},
+		}},
+	})
+	ctx := newLuaRouteTestContext()
+	ctx.Content.SkipDNSResolve = false
+	route, err := r.PickRoute(ctx)
+	if err != nil || route.GetOutboundTag() != "lua-out" || route.GetRuleTag() != "lua-rule" || route.(*Route).Context != ctx {
+		t.Fatalf("route = %v, %v", route, err)
+	}
+	ctx.Inbound.Tag = "miss"
+	if route, err := r.PickRoute(ctx); route != nil || err != common.ErrNoClue {
+		t.Fatalf("miss = %v, %v", route, err)
+	}
+	if dnsCalls.Load() != 0 {
+		t.Fatal("script routing implicitly resolved DNS")
+	}
+}
+
+func TestRouterScriptModules(t *testing.T) {
+	ips := []net.IP{{127, 0, 0, 7}}
+	calls := 0
+	d := &luaRouteDNSClient{lookup: func(domain string, option featureDNS.IPOption) ([]net.IP, uint32, error) {
+		calls++
+		if domain != "MiXeD.Example." || !option.IPv4Enable || option.IPv6Enable || !option.FakeEnable {
+			t.Fatalf("dns.Query arguments = %q, %+v", domain, option)
+		}
+		return ips, 17, nil
+	}}
+	r := startLuaRouter(t, `
+local dns = require("xray.dns")
+local matcher = require("xray.geodata").BuildIPMatcher("127.0.0.0/8")
+assert(dns.Servers == nil and type(dns.Query) == "function")
+assert(type(require("xray.log").Info) == "function")
+function HandleRoute(ctx, inbound, sourcePort, targetPort, localPort, domain)
+    local ips, ttl, err = dns.Query(domain, true, false, true)
+    assert(not err and ttl == 17)
+    assert(matcher:AnyMatch(ips) and matcher:AnyMatch(ctx:GetTargetIPs()))
+    return "out"
+end`, d, nil)
+	if _, err := r.PickRoute(newLuaRouteTestContext()); err != nil {
+		t.Fatal(err)
+	}
+	if calls != 1 {
+		t.Fatalf("DNS calls = %d, want 1", calls)
+	}
+}
+
+func TestRouterScriptBalancerReload(t *testing.T) {
+	config := func(tag string) *Config {
+		return &Config{BalancingRule: []*BalancingRule{{
+			Tag: "balance", Strategy: "roundrobin", OutboundSelector: []string{tag},
+		}}}
+	}
+	r := startLuaRouter(t, `
+local router = require("xray.router")
+function HandleRoute()
+    local tag, err = router:PickOutbound("balance")
+    return tag, "balanced", err
+end`, nil, config("old"))
+	pick := func(want string) {
+		t.Helper()
+		route, err := r.PickRoute(&routing_session.Context{})
+		if err != nil || route.GetOutboundTag() != want || route.GetRuleTag() != "balanced" {
+			t.Fatalf("route = %v, %v, want %q", route, err, want)
+		}
+	}
+
+	pick("old")
+	if err := r.SetOverrideTarget("balance", "override"); err != nil {
+		t.Fatal(err)
+	}
+	pick("override")
+	if err := r.SetOverrideTarget("balance", ""); err != nil {
+		t.Fatal(err)
+	}
+	if err := r.ReloadRules(config("new"), false); err != nil {
+		t.Fatal(err)
+	}
+	pick("new")
+}
+
+func TestRouterScriptConcurrentBalancerReload(t *testing.T) {
+	config := func(tag string) *Config {
+		return &Config{BalancingRule: []*BalancingRule{{
+			Tag: "balance", Strategy: "roundrobin", OutboundSelector: []string{tag},
+		}}}
+	}
+	r := startLuaRouter(t, `
+local router = require("xray.router")
+function HandleRoute()
+    local tag, err = router:PickOutbound("balance")
+    return tag, nil, err
+end`, nil, config("a"))
+
+	var wg sync.WaitGroup
+	for range 4 {
+		wg.Go(func() {
+			for range 20 {
+				route, err := r.PickRoute(&routing_session.Context{})
+				if err != nil {
+					t.Errorf("PickRoute: %v", err)
+					return
+				}
+				if tag := route.GetOutboundTag(); tag != "a" && tag != "b" {
+					t.Errorf("unexpected tag %q", tag)
+				}
+			}
+		})
+	}
+	wg.Go(func() {
+		for range 20 {
+			for _, tag := range []string{"a", "b"} {
+				if err := r.ReloadRules(config(tag), false); err != nil {
+					t.Error(err)
+					return
+				}
+			}
+		}
+	})
+	wg.Wait()
+}
+
+func TestRouterScriptStateReuse(t *testing.T) {
+	r := startLuaRouter(t, `
+local calls = 0
+function HandleRoute(ctx, inbound)
+    calls = calls + 1
+    if inbound == "miss" then return nil end
+    if inbound == "fail" then error("failed") end
+    return tostring(calls)
+end`, nil, nil)
+	ctx := newLuaRouteTestContext()
+	pick := func(want string) {
+		t.Helper()
+		route, err := r.PickRoute(ctx)
+		if err != nil || route.GetOutboundTag() != want {
+			t.Fatalf("route = %v, %v, want %q", route, err, want)
+		}
+	}
+
+	pick("1")
+	ctx.Inbound.Tag = "miss"
+	if _, err := r.PickRoute(ctx); err != common.ErrNoClue {
+		t.Fatalf("miss = %v", err)
+	}
+	ctx.Inbound.Tag = "in"
+	pick("3")
+	ctx.Inbound.Tag = "fail"
+	if _, err := r.PickRoute(ctx); err == nil {
+		t.Fatal("script error was ignored")
+	}
+	ctx.Inbound.Tag = "in"
+	pick("1")
+}
+
+func TestRouterScriptDNSDispatcherReentry(t *testing.T) {
+	conn, err := stdnet.ListenPacket("udp4", "127.0.0.1:0")
+	if err != nil {
+		t.Fatal(err)
+	}
+	port := conn.LocalAddr().(*stdnet.UDPAddr).Port
+	ready, stopped := make(chan struct{}), make(chan error, 1)
+	var queries atomic.Int32
+	server := &wireDNS.Server{
+		PacketConn: conn,
+		NotifyStartedFunc: func() {
+			close(ready)
+		},
+		Handler: wireDNS.HandlerFunc(func(w wireDNS.ResponseWriter, query *wireDNS.Msg) {
+			queries.Add(1)
+			response := new(wireDNS.Msg).SetReply(query)
+			for _, question := range query.Question {
+				if question.Name == "nested.example." && question.Qtype == wireDNS.TypeA {
+					response.Answer = append(response.Answer, &wireDNS.A{
+						Hdr: wireDNS.RR_Header{Name: question.Name, Rrtype: wireDNS.TypeA, Class: wireDNS.ClassINET, Ttl: 60},
+						A:   stdnet.IP{127, 0, 0, 7},
+					})
+				}
+			}
+			if err := w.WriteMsg(response); err != nil {
+				t.Error(err)
+			}
+		}),
+	}
+	go func() { stopped <- server.ActivateAndServe() }()
+	defer func() {
+		server.Shutdown()
+		select {
+		case err := <-stopped:
+			if err != nil {
+				t.Error(err)
+			}
+		case <-time.After(3 * time.Second):
+			t.Error("DNS server did not stop")
+		}
+	}()
+	select {
+	case <-ready:
+	case err := <-stopped:
+		t.Fatalf("DNS server startup: %v", err)
+	case <-time.After(3 * time.Second):
+		t.Fatal("DNS server did not start")
+	}
+
+	dnsScript := writeRouteScript(t, `
+local server = require("xray.dns").Servers[1]
+function HandleDNSQuery(domain, ipv4, ipv6, fake)
+    return server:Query(domain, ipv4, ipv6, fake)
+end`)
+	routerScript := writeRouteScript(t, `
+local router = require("xray.router")
+local dns = require("xray.dns")
+local matcher = require("xray.geodata").BuildIPMatcher("127.0.0.7")
+local active = false
+function HandleRoute(ctx, inbound, sourcePort, targetPort, localPort, domain, network,
+    protocol, user, vlessRoute, skipDNSResolve)
+    assert(not active, "borrowed Router VM reentered")
+    if inbound == "dns" then
+        assert(network == router.NetworkUDP and skipDNSResolve == false)
+        return "direct", "dns-route"
+    end
+    active = true
+    local ips, ttl, err = dns.Query("nested.example", true, false, false)
+    assert(not err and matcher:AnyMatch(ips) and active)
+    active = false
+    return "direct", "outer-route"
+end`)
+	instance, err := core.New(&core.Config{
+		App: []*serial.TypedMessage{
+			serial.ToTypedMessage(&appdns.Config{
+				Tag: "dns", Script: dnsScript, DisableCache: true,
+				NameServer: []*appdns.NameServer{{
+					Id: "upstream", TimeoutMs: 1000,
+					Address: &net.Endpoint{
+						Network: net.Network_UDP,
+						Address: &net.IPOrDomain{Address: &net.IPOrDomain_Ip{Ip: []byte{127, 0, 0, 1}}},
+						Port:    uint32(port),
+					},
+				}},
+			}),
+			serial.ToTypedMessage(&Config{Script: routerScript}),
+			serial.ToTypedMessage(&dispatcher.Config{}),
+			serial.ToTypedMessage(&proxyman.OutboundConfig{}),
+		},
+		Outbound: []*core.OutboundHandlerConfig{
+			{Tag: "default", ProxySettings: serial.ToTypedMessage(&blackhole.Config{})},
+			{Tag: "direct", ProxySettings: serial.ToTypedMessage(&freedom.Config{
+				FinalRules: []*freedom.FinalRuleConfig{{Action: freedom.RuleAction_Allow}},
+			})},
+		},
+	})
+	if err != nil {
+		t.Fatal(err)
+	}
+	defer instance.Close()
+	if err := instance.Start(); err != nil {
+		t.Fatal(err)
+	}
+	r := instance.GetFeature(routing.RouterType()).(*Router)
+	route, err := r.PickRoute(newLuaRouteTestContext())
+	if err != nil || route.GetOutboundTag() != "direct" || route.GetRuleTag() != "outer-route" {
+		t.Fatalf("nested DNS routing = %v, %v", route, err)
+	}
+	if queries.Load() == 0 {
+		t.Fatal("DNS query did not pass through the dispatcher")
+	}
+}

app/router/webhook.go

@@ -8,6 +8,7 @@ import (
 	"net"
 	"net/http"
 	"sync"
+	"sync/atomic"
 	"time"
 
 	"github.com/xtls/xray-core/common/errors"
@@ -40,6 +41,7 @@ type WebhookNotifier struct {
 	deduplication uint32
 	client        *http.Client
 	seen          sync.Map
+	lastSweep     atomic.Int64
 	done          chan struct{}
 	wg            sync.WaitGroup
 	closeOnce     sync.Once
@@ -77,11 +79,6 @@ func NewWebhookNotifier(cfg *WebhookConfig) (*WebhookNotifier, error) {
 		}
 	}
 
-	if h.deduplication > 0 {
-		h.wg.Add(1)
-		go h.cleanupLoop()
-	}
-
 	return h, nil
 }
 
@@ -201,6 +198,7 @@ func (h *WebhookNotifier) isDuplicate(email string) bool {
 	}
 	ttl := time.Duration(h.deduplication) * time.Second
 	now := time.Now()
+	h.maybeSweep(now, ttl)
 	if v, loaded := h.seen.LoadOrStore(email, now); loaded {
 		if now.Sub(v.(time.Time)) < ttl {
 			return true
@@ -210,27 +208,23 @@ func (h *WebhookNotifier) isDuplicate(email string) bool {
 	return false
 }
 
-func (h *WebhookNotifier) cleanupLoop() {
-	defer h.wg.Done()
-	ttl := time.Duration(h.deduplication) * time.Second
-	ticker := time.NewTicker(ttl)
-	defer ticker.Stop()
-	for {
-		select {
-		case <-h.done:
-			return
-		case <-ticker.C:
-			now := time.Now()
-			h.seen.Range(func(key, value any) bool {
-				if now.Sub(value.(time.Time)) >= ttl {
-					h.seen.Delete(key)
-				}
-				return true
-			})
-		}
+func (h *WebhookNotifier) maybeSweep(now time.Time, ttl time.Duration) {
+	last := h.lastSweep.Load()
+	if now.UnixNano()-last < int64(ttl) {
+		return
 	}
+	if !h.lastSweep.CompareAndSwap(last, now.UnixNano()) {
+		return // another goroutine did the sweep
+	}
+	h.seen.Range(func(key, value any) bool {
+		if now.Sub(value.(time.Time)) >= ttl {
+			h.seen.Delete(key)
+		}
+		return true
+	})
 }
 
+// Only need to call if the Notifier is really used, otherwise GC can clean it
 func (h *WebhookNotifier) Close() error {
 	h.closeOnce.Do(func() {
 		close(h.done)

common/buf/readv_windows.go

@@ -5,7 +5,8 @@ import (
 )
 
 type windowsReader struct {
-	bufs []syscall.WSABuf
+	bufs  []syscall.WSABuf
+	ready bool
 }
 
 func (r *windowsReader) Init(bs []*Buffer) {
@@ -15,6 +16,7 @@ func (r *windowsReader) Init(bs []*Buffer) {
 	for _, b := range bs {
 		r.bufs = append(r.bufs, syscall.WSABuf{Len: uint32(Size), Buf: &b.v[0]})
 	}
+	r.ready = false
 }
 
 func (r *windowsReader) Clear() {
@@ -25,6 +27,14 @@ func (r *windowsReader) Clear() {
 }
 
 func (r *windowsReader) Read(fd uintptr) int32 {
+	// On the first invocation, we return -1 to indicate "not ready"
+	// to make rawConn.Read wait for readability using the runtime's own mechanism
+	// because syscall.WSARecv() is a blocking call when used with nil OVERLAPPED
+	if !r.ready {
+		r.ready = true
+		return -1
+	}
+
 	var nBytes uint32
 	var flags uint32
 	err := syscall.WSARecv(syscall.Handle(fd), &r.bufs[0], uint32(len(r.bufs)), &nBytes, &flags, nil, nil)

common/buf/writer.go

@@ -118,7 +118,9 @@ func (w *BufferedWriter) Write(b []byte) (int, error) {
 
 		nBytes, err := w.buffer.Write(b)
 		totalBytes += nBytes
-		if err != nil {
+
+		// ErrBufferFull means a partial write, so flush below and continue
+		if err != nil && err != ErrBufferFull {
 			return totalBytes, err
 		}
 		if !w.buffered || w.buffer.IsFull() {

common/crypto/crypto.go

@@ -10,12 +10,12 @@ import (
 
 // [,)
 func RandBetween(from int64, to int64) int64 {
-	if from == to {
-		return from
-	}
 	if from > to {
 		from, to = to, from
 	}
+	if d := to - from; d == 0 || d == 1 {
+		return from
+	}
 	bigInt, _ := rand.Int(rand.Reader, big.NewInt(to-from))
 	return from + bigInt.Int64()
 }

common/geodata/lua.go

@@ -0,0 +1,58 @@
+package geodata
+
+import (
+	lua "github.com/yuin/gopher-lua"
+	luar "layeh.com/gopher-luar"
+)
+
+// RegisterLua makes xray.geodata available to require in an LState.
+func RegisterLua(L *lua.LState) {
+	L.PreloadModule("xray.geodata", func(L *lua.LState) int {
+		module := L.NewTable()
+
+		module.RawSetString("BuildDomainMatcher", L.NewFunction(func(L *lua.LState) int {
+			parsed, err := ParseDomainRules(luaRules(L), Domain_Domain)
+			if err != nil {
+				L.RaiseError("%v", err)
+				return 0
+			}
+			matcher, err := DomainReg.BuildDomainMatcher(parsed)
+			if err != nil {
+				L.RaiseError("%v", err)
+				return 0
+			}
+			L.Push(luar.New(L, matcher))
+			return 1
+		}))
+
+		module.RawSetString("BuildIPMatcher", L.NewFunction(func(L *lua.LState) int {
+			parsed, err := ParseIPRules(luaRules(L))
+			if err != nil {
+				L.RaiseError("%v", err)
+				return 0
+			}
+			matcher, err := IPReg.BuildIPMatcher(parsed)
+			if err != nil {
+				L.RaiseError("%v", err)
+				return 0
+			}
+			L.Push(luar.New(L, matcher))
+			return 1
+		}))
+		L.Push(module)
+		return 1
+	})
+}
+
+func luaRules(L *lua.LState) []string {
+	rules := make([]string, L.GetTop())
+	for i := range rules {
+		value, ok := L.Get(i + 1).(lua.LString)
+		if !ok {
+			L.RaiseError("geodata rules must be strings")
+			return nil
+		}
+		rules[i] = string(value)
+	}
+	return rules
+}

common/geodata/lua_test.go

@@ -0,0 +1,66 @@
+package geodata
+
+import (
+	"testing"
+
+	"github.com/xtls/xray-core/common/net"
+	lua "github.com/yuin/gopher-lua"
+)
+
+func TestLuaIPMatcher(t *testing.T) {
+	L := lua.NewState()
+	defer L.Close()
+	RegisterLua(L)
+	ip := L.NewUserData()
+	ip.Value = net.ParseIP("127.0.0.1")
+	L.SetGlobal("ip", ip)
+	ips := L.NewUserData()
+	ips.Value = []net.IP{ip.Value.(net.IP), net.ParseIP("8.8.8.8")}
+	L.SetGlobal("ips", ips)
+	if err := L.DoString(`
+		local matcher = require("xray.geodata").BuildIPMatcher("127.0.0.0/8", "::1")
+		assert(matcher:Match(ip))
+		assert(matcher:AnyMatch(ips))
+		assert(not matcher:Matches(ips))
+		local matched, unmatched = matcher:FilterIPs(ips)
+		assert(type(matched) == "userdata" and type(unmatched) == "userdata")
+		assert(#matched == 1 and #unmatched == 1)
+	`); err != nil {
+		t.Fatal(err)
+	}
+}
+
+func TestLuaDomainMatcher(t *testing.T) {
+	L := lua.NewState()
+	defer L.Close()
+	RegisterLua(L)
+	if err := L.DoString(`
+		local matcher = require("xray.geodata").BuildDomainMatcher("example.com", "full:other.com")
+		assert(matcher:MatchAny("example.com"))
+		assert(matcher:MatchAny("www.example.com"))
+		assert(matcher:MatchAny("other.com"))
+		assert(not matcher:MatchAny("www.other.com"))
+		assert(#(matcher:Match("www.example.com")) == 1)
+	`); err != nil {
+		t.Fatal(err)
+	}
+}
+
+func TestLuaMatchersRejectInvalidRules(t *testing.T) {
+	for _, tc := range []struct {
+		name   string
+		script string
+	}{
+		{"IP rule", `require("xray.geodata").BuildIPMatcher("not-an-ip")`},
+		{"non-string domain rule", `require("xray.geodata").BuildDomainMatcher("example.com", true)`},
+	} {
+		t.Run(tc.name, func(t *testing.T) {
+			L := lua.NewState()
+			defer L.Close()
+			RegisterLua(L)
+			if err := L.DoString(tc.script); err == nil {
+				t.Fatal("invalid geodata rule was accepted")
+			}
+		})
+	}
+}

common/log/lua.go

@@ -0,0 +1,50 @@
+package log
+
+import (
+	"path/filepath"
+	"strings"
+
+	lua "github.com/yuin/gopher-lua"
+)
+
+// RegisterLua makes xray.log available to require in an LState.
+func RegisterLua(L *lua.LState) {
+	L.PreloadModule("xray.log", func(L *lua.LState) int {
+		module := L.NewTable()
+		for name, severity := range map[string]Severity{
+			"Debug":   Severity_Debug,
+			"Info":    Severity_Info,
+			"Warning": Severity_Warning,
+			"Error":   Severity_Error,
+		} {
+			module.RawSetString(name, L.NewFunction(func(L *lua.LState) int {
+				var content strings.Builder
+				// Prefix with the calling script's filename.
+				if caller, ok := L.GetStack(1); ok {
+					if _, err := L.GetInfo("S", caller, lua.LNil); err == nil && caller.Source != "" {
+						content.WriteString(filepath.Base(strings.TrimPrefix(caller.Source, "@")))
+						content.WriteString(": ")
+					}
+				}
+				for i := 1; i <= L.GetTop(); i++ {
+					value := L.Get(i)
+					// Use Error() for Go errors in userdata.
+					if ud, ok := value.(*lua.LUserData); ok {
+						if err, ok := ud.Value.(error); ok {
+							content.WriteString(err.Error())
+							continue
+						}
+					}
+					content.WriteString(L.ToStringMeta(value).String())
+				}
+				Record(&GeneralMessage{
+					Severity: severity,
+					Content:  content.String(),
+				})
+				return 0
+			}))
+		}
+		L.Push(module)
+		return 1
+	})
+}

common/log/lua_test.go

@@ -0,0 +1,92 @@
+package log
+
+import (
+	"errors"
+	"fmt"
+	"os"
+	"path/filepath"
+	"testing"
+
+	lua "github.com/yuin/gopher-lua"
+)
+
+type luaLogHandler struct {
+	messages []Message
+}
+
+func (h *luaLogHandler) Handle(msg Message) {
+	h.messages = append(h.messages, msg)
+}
+
+func TestLuaLog(t *testing.T) {
+	logHandler.RLock()
+	previous := logHandler.Handler
+	logHandler.RUnlock()
+	t.Cleanup(func() { RegisterHandler(previous) })
+	handler := &luaLogHandler{}
+	RegisterHandler(handler)
+
+	L := lua.NewState()
+	defer L.Close()
+	RegisterLua(L)
+	nativeError := L.NewUserData()
+	nativeError.Value = fmt.Errorf("lookup failed: %w", errors.New("upstream timeout"))
+	L.SetGlobal("nativeError", nativeError)
+	path := filepath.Join(t.TempDir(), "logging.lua")
+	if err := os.WriteFile(path, []byte(`
+		local log = require("xray.log")
+		assert(log == require("xray.log"))
+		log.Debug("query: ", "example.com")
+		log.Info("count=", 42, ", enabled=", true, ", value=", nil)
+		log.Warning(setmetatable({}, {
+			__tostring = function() return "fallback" end
+		}))
+		assert(select("#", log.Error("failed")) == 0)
+		log.Error("DNS failed: ", nativeError)
+		log.Warning(nativeError)
+		local ok, err = pcall(function() error("Lua failure", 0) end)
+		assert(not ok)
+		log.Error(err)
+		function logHook()
+			log.Info("hook")
+		end
+	`), 0o600); err != nil {
+		t.Fatal(err)
+	}
+	if err := L.DoFile(path); err != nil {
+		t.Fatal(err)
+	}
+	if err := L.DoString(`
+		logHook()
+		require("xray.log").Info("anonymous")
+	`); err != nil {
+		t.Fatal(err)
+	}
+
+	want := []struct {
+		severity Severity
+		message  string
+	}{
+		{Severity_Debug, "[Debug] logging.lua: query: example.com"},
+		{Severity_Info, "[Info] logging.lua: count=42, enabled=true, value=nil"},
+		{Severity_Warning, "[Warning] logging.lua: fallback"},
+		{Severity_Error, "[Error] logging.lua: failed"},
+		{Severity_Error, "[Error] logging.lua: DNS failed: lookup failed: upstream timeout"},
+		{Severity_Warning, "[Warning] logging.lua: lookup failed: upstream timeout"},
+		{Severity_Error, "[Error] logging.lua: Lua failure"},
+		{Severity_Info, "[Info] logging.lua: hook"},
+		{Severity_Info, "[Info] <string>: anonymous"},
+	}
+	if len(handler.messages) != len(want) {
+		t.Fatalf("logged %d messages, want %d", len(handler.messages), len(want))
+	}
+	for i, expected := range want {
+		msg, ok := handler.messages[i].(*GeneralMessage)
+		if !ok {
+			t.Fatalf("message %d has type %T, want *GeneralMessage", i, handler.messages[i])
+		}
+		if msg.Severity != expected.severity || msg.String() != expected.message {
+			t.Errorf("message %d = %q with severity %v, want %q with severity %v", i, msg.String(), msg.Severity, expected.message, expected.severity)
+		}
+	}
+}

common/lua/pool.go

@@ -0,0 +1,138 @@
+package lua
+
+import (
+	"context"
+	"errors"
+	"sync"
+
+	glua "github.com/yuin/gopher-lua"
+)
+
+const maxIdleStates = 16
+
+// LStateFactory must initialize a state fully and observe ctx while doing so.
+// The pool owns any non-nil state it returns, even when it also returns an error.
+type LStateFactory func(ctx context.Context) (*glua.LState, error)
+
+// Pool lends each state to one caller at a time. It grows on contention and
+// keeps up to maxIdleStates idle states until Close. Callers decide whether a
+// state is reusable.
+type Pool struct {
+	ctx    context.Context
+	cancel context.CancelFunc
+
+	factory LStateFactory
+	idle    []*glua.LState
+
+	mu     sync.Mutex
+	active sync.WaitGroup
+	closed bool
+}
+
+// NewPool initializes one state before returning, so top-level errors surface at startup.
+func NewPool(ctx context.Context, factory LStateFactory) (*Pool, error) {
+	poolCtx, cancel := context.WithCancel(ctx)
+
+	// Create one state now to catch factory errors at startup.
+	state, err := factory(poolCtx)
+	if err != nil {
+		cancel()
+		if state != nil {
+			state.Close()
+		}
+		return nil, err
+	}
+	if state == nil {
+		cancel()
+		return nil, errors.New("Lua state factory returned nil")
+	}
+	if err := poolCtx.Err(); err != nil {
+		state.Close()
+		cancel()
+		return nil, err
+	}
+
+	return &Pool{ctx: poolCtx, cancel: cancel, factory: factory, idle: []*glua.LState{state}}, nil
+}
+
+// Context is cancelled by Close. Query contexts should derive from it.
+func (p *Pool) Context() context.Context {
+	return p.ctx
+}
+
+// Acquire returns an initialized exclusive state, growing the pool if necessary.
+func (p *Pool) Acquire() (*glua.LState, error) {
+	p.mu.Lock()
+	if p.closed || p.ctx.Err() != nil {
+		p.mu.Unlock()
+		return nil, p.ctx.Err()
+	}
+
+	p.active.Add(1)
+
+	n := len(p.idle)
+	if n != 0 {
+		state := p.idle[n-1]
+		p.idle = p.idle[:n-1]
+		p.mu.Unlock()
+		return state, nil
+	}
+	p.mu.Unlock()
+
+	// TODO: Limit the total number of states. When the limit is reached, wait
+	// for a Release instead of creating another state; allow the wait to be
+	// cancelled by the caller or by Close.
+	state, err := p.factory(p.ctx)
+	if err == nil && state == nil {
+		err = errors.New("Lua state factory returned nil")
+	}
+	if err != nil {
+		if state != nil {
+			state.Close()
+		}
+		p.active.Done()
+		return nil, err
+	}
+	if err := p.ctx.Err(); err != nil {
+		state.Close()
+		p.active.Done()
+		return nil, err
+	}
+
+	return state, nil
+}
+
+// Release returns a healthy state to the pool and closes a failed or cancelled one.
+func (p *Pool) Release(state *glua.LState, reusable bool) {
+	if reusable {
+		p.mu.Lock()
+		if !p.closed && p.ctx.Err() == nil && len(p.idle) < maxIdleStates {
+			p.idle = append(p.idle, state)
+		} else {
+			reusable = false
+		}
+		p.mu.Unlock()
+	}
+
+	if !reusable {
+		state.Close()
+	}
+
+	p.active.Done()
+}
+
+// Close cancels active work, closes idle states, and waits for borrowed states.
+func (p *Pool) Close() {
+	p.mu.Lock()
+	if !p.closed {
+		p.closed = true
+		p.cancel()
+		for _, state := range p.idle {
+			state.Close()
+		}
+		p.idle = nil
+	}
+	p.mu.Unlock()
+
+	p.active.Wait()
+}

common/lua/pool_test.go

@@ -0,0 +1,197 @@
+package lua
+
+import (
+	"context"
+	"errors"
+	"testing"
+	"time"
+
+	glua "github.com/yuin/gopher-lua"
+)
+
+func TestPoolFactoryFailureClosesReturnedState(t *testing.T) {
+	failure := errors.New("factory failed")
+	state := glua.NewState()
+	_, err := NewPool(context.Background(), func(context.Context) (*glua.LState, error) {
+		return state, failure
+	})
+	if !errors.Is(err, failure) || !state.IsClosed() {
+		t.Fatalf("NewPool error = %v, state closed = %t", err, state.IsClosed())
+	}
+
+	var failedState *glua.LState
+	calls := 0
+	pool, err := NewPool(context.Background(), func(context.Context) (*glua.LState, error) {
+		calls++
+		if calls == 1 {
+			return glua.NewState(), nil
+		}
+		failedState = glua.NewState()
+		return failedState, failure
+	})
+	if err != nil {
+		t.Fatal(err)
+	}
+	defer pool.Close()
+	borrowed, err := pool.Acquire()
+	if err != nil {
+		t.Fatal(err)
+	}
+	defer pool.Release(borrowed, true)
+	_, err = pool.Acquire()
+	if !errors.Is(err, failure) || !failedState.IsClosed() {
+		t.Fatalf("Acquire error = %v, state closed = %t", err, failedState.IsClosed())
+	}
+}
+
+func TestPoolReusesStatesAndLimitsIdle(t *testing.T) {
+	created := 0
+	pool, err := NewPool(context.Background(), func(context.Context) (*glua.LState, error) {
+		created++
+		return glua.NewState(), nil
+	})
+	if err != nil {
+		t.Fatal(err)
+	}
+	defer pool.Close()
+
+	states := make([]*glua.LState, maxIdleStates+3)
+	for i := range states {
+		states[i], err = pool.Acquire()
+		if err != nil {
+			t.Fatal(err)
+		}
+	}
+	for _, state := range states {
+		pool.Release(state, true)
+	}
+	for i, state := range states {
+		if got, want := state.IsClosed(), i >= maxIdleStates; got != want {
+			t.Fatalf("state %d closed = %t, want %t", i, got, want)
+		}
+	}
+	borrowed, err := pool.Acquire()
+	if err != nil {
+		t.Fatal(err)
+	}
+	if created != len(states) {
+		t.Fatalf("Acquire created %d states, want %d", created, len(states))
+	}
+	pool.Release(borrowed, true)
+}
+
+func TestPoolCloseCancelsAndWaitsForBorrowedState(t *testing.T) {
+	pool, err := NewPool(context.Background(), func(context.Context) (*glua.LState, error) {
+		return glua.NewState(), nil
+	})
+	if err != nil {
+		t.Fatal(err)
+	}
+	state, err := pool.Acquire()
+	if err != nil {
+		t.Fatal(err)
+	}
+	done := make(chan struct{})
+	go func() {
+		pool.Close()
+		close(done)
+	}()
+	select {
+	case <-pool.Context().Done():
+	case <-time.After(time.Second):
+		pool.Release(state, false)
+		t.Fatal("Close did not cancel the pool context")
+	}
+	select {
+	case <-done:
+		pool.Release(state, false)
+		t.Fatal("Close returned while a state was borrowed")
+	default:
+	}
+	pool.Release(state, true)
+	select {
+	case <-done:
+	case <-time.After(time.Second):
+		t.Fatal("Close did not finish after Release")
+	}
+	if !state.IsClosed() {
+		t.Fatal("borrowed state was not closed")
+	}
+	if _, err := pool.Acquire(); !errors.Is(err, context.Canceled) {
+		t.Fatalf("Acquire after Close = %v, want context.Canceled", err)
+	}
+	pool.Close()
+}
+
+func TestPoolCloseCancelsStateCreation(t *testing.T) {
+	started := make(chan struct{})
+	first := true
+	pool, err := NewPool(context.Background(), func(ctx context.Context) (*glua.LState, error) {
+		if first {
+			first = false
+			return glua.NewState(), nil
+		}
+		close(started)
+		<-ctx.Done()
+		return nil, ctx.Err()
+	})
+	if err != nil {
+		t.Fatal(err)
+	}
+	borrowed, err := pool.Acquire()
+	if err != nil {
+		t.Fatal(err)
+	}
+	acquireDone := make(chan error, 1)
+	go func() {
+		_, err := pool.Acquire()
+		acquireDone <- err
+	}()
+	<-started
+	closeDone := make(chan struct{})
+	go func() {
+		pool.Close()
+		close(closeDone)
+	}()
+	select {
+	case err := <-acquireDone:
+		if !errors.Is(err, context.Canceled) {
+			t.Fatalf("Acquire during Close = %v, want context.Canceled", err)
+		}
+	case <-time.After(time.Second):
+		t.Fatal("state creation did not stop after Close")
+	}
+	select {
+	case <-closeDone:
+		pool.Release(borrowed, false)
+		t.Fatal("Close returned while the initial state was borrowed")
+	default:
+	}
+	pool.Release(borrowed, true)
+	select {
+	case <-closeDone:
+	case <-time.After(time.Second):
+		t.Fatal("Close did not finish after Release")
+	}
+}
+
+func BenchmarkPoolAcquireRelease(b *testing.B) {
+	pool, err := NewPool(context.Background(), func(context.Context) (*glua.LState, error) {
+		return glua.NewState(), nil
+	})
+	if err != nil {
+		b.Fatal(err)
+	}
+	defer pool.Close()
+
+	b.ReportAllocs()
+	b.ResetTimer()
+	for i := 0; i < b.N; i++ {
+		state, err := pool.Acquire()
+		if err != nil {
+			b.Fatal(err)
+		}
+		pool.Release(state, true)
+	}
+	b.StopTimer()
+}

common/lua/program.go

@@ -0,0 +1,56 @@
+// Package lua provides shared GopherLua programs and state management for Xray scripts.
+package lua
+
+import (
+	"bufio"
+	"context"
+	"os"
+
+	glua "github.com/yuin/gopher-lua"
+	"github.com/yuin/gopher-lua/parse"
+)
+
+// Program holds immutable bytecode that can be run by independent LStates.
+type Program struct {
+	proto *glua.FunctionProto
+}
+
+// CompileFile reads and compiles a Lua file once.
+func CompileFile(path string) (*Program, error) {
+	f, err := os.Open(path)
+	if err != nil {
+		return nil, err
+	}
+	defer f.Close()
+	chunk, err := parse.Parse(bufio.NewReader(f), path)
+	if err != nil {
+		return nil, err
+	}
+	proto, err := glua.Compile(chunk, path)
+	if err != nil {
+		return nil, err
+	}
+	return &Program{proto: proto}, nil
+}
+
+// NewState creates a VM, makes modules available, and executes the file top level.
+// Module loaders run only when Lua calls require. Each state gets its own globals.
+// The caller owns the returned state.
+func (p *Program) NewState(ctx context.Context, register func(*glua.LState)) (*glua.LState, error) {
+	L := glua.NewState()
+	if register != nil {
+		register(L)
+	}
+	L.SetContext(ctx)
+	L.Push(L.NewFunctionFromProto(p.proto))
+	err := L.PCall(0, 0, nil)
+	L.RemoveContext()
+	if err == nil {
+		err = ctx.Err()
+	}
+	if err != nil {
+		L.Close()
+		return nil, err
+	}
+	return L, nil
+}

common/lua/program_test.go

@@ -0,0 +1,55 @@
+package lua
+
+import (
+	"context"
+	"os"
+	"path/filepath"
+	"testing"
+
+	glua "github.com/yuin/gopher-lua"
+)
+
+func TestProgramStatesAreIndependent(t *testing.T) {
+	path := filepath.Join(t.TempDir(), "state.lua")
+	if err := os.WriteFile(path, []byte("value = (value or 0) + 1"), 0o600); err != nil {
+		t.Fatal(err)
+	}
+	program, err := CompileFile(path)
+	if err != nil {
+		t.Fatal(err)
+	}
+	first, err := program.NewState(context.Background(), nil)
+	if err != nil {
+		t.Fatal(err)
+	}
+	defer first.Close()
+	first.SetGlobal("value", glua.LNumber(42))
+	second, err := program.NewState(context.Background(), nil)
+	if err != nil {
+		t.Fatal(err)
+	}
+	defer second.Close()
+	if got := second.GetGlobal("value"); got != glua.LNumber(1) {
+		t.Fatalf("second state value = %v, want 1", got)
+	}
+}
+
+func TestProgramInitializationObservesCancellation(t *testing.T) {
+	path := filepath.Join(t.TempDir(), "loop.lua")
+	if err := os.WriteFile(path, []byte("while true do end"), 0o600); err != nil {
+		t.Fatal(err)
+	}
+	program, err := CompileFile(path)
+	if err != nil {
+		t.Fatal(err)
+	}
+	ctx, cancel := context.WithCancel(context.Background())
+	cancel()
+	state, err := program.NewState(ctx, nil)
+	if err == nil || state != nil {
+		if state != nil {
+			state.Close()
+		}
+		t.Fatalf("NewState with canceled context = %v, %v; want nil state and error", state, err)
+	}
+}

common/net/find_process_darwin.go

@@ -1,4 +1,4 @@
-//go:build darwin
+//go:build darwin && !ios
 
 package net
 
@@ -198,7 +198,9 @@ func darwinSocketInfoMatchLevel(info []byte, network string, srcAddr netip.Addr,
 
 	vflag := info[darwinInSockInfoVFlagOff]
 	if srcAddr.Is4() {
-		if family != unix.AF_INET || vflag&darwinInSockInfoIPv4 == 0 {
+		// Dual-stack sockets expose IPv4-mapped connections as AF_INET6
+		// while marking the endpoint as IPv4 in ini_vflag.
+		if (family != unix.AF_INET && family != unix.AF_INET6) || vflag&darwinInSockInfoIPv4 == 0 {
 			return darwinSocketNoMatch
 		}
 	} else {

common/net/find_process_darwin.s

@@ -1,4 +1,4 @@
-//go:build darwin
+//go:build darwin && !ios
 
 #include "textflag.h"
 

common/net/find_process_darwin_test.go

@@ -1,4 +1,4 @@
-//go:build darwin
+//go:build darwin && !ios
 
 package net
 
@@ -52,6 +52,57 @@ func TestFindProcessDarwinTCP(t *testing.T) {
 	assertCurrentProcess(t, pid, name, path)
 }
 
+func TestFindProcessDarwinTCPIPv4Mapped(t *testing.T) {
+	listener, err := stdnet.Listen("tcp4", "127.0.0.1:0")
+	if err != nil {
+		t.Fatal(err)
+	}
+	defer listener.Close()
+
+	accepted := make(chan stdnet.Conn, 1)
+	go func() {
+		conn, err := listener.Accept()
+		if err == nil {
+			accepted <- conn
+			return
+		}
+		close(accepted)
+	}()
+
+	listenerAddr := listener.Addr().(*stdnet.TCPAddr)
+	fd, err := unix.Socket(unix.AF_INET6, unix.SOCK_STREAM, unix.IPPROTO_TCP)
+	if err != nil {
+		t.Fatal(err)
+	}
+	defer unix.Close(fd)
+
+	mappedAddr := [16]byte{10: 0xff, 11: 0xff, 12: 127, 15: 1}
+	if err := unix.Connect(fd, &unix.SockaddrInet6{
+		Port: listenerAddr.Port,
+		Addr: mappedAddr,
+	}); err != nil {
+		t.Fatal(err)
+	}
+
+	serverConn := <-accepted
+	if serverConn == nil {
+		t.Fatal("server did not accept tcp connection")
+	}
+	defer serverConn.Close()
+
+	local, err := unix.Getsockname(fd)
+	if err != nil {
+		t.Fatal(err)
+	}
+	localPort := local.(*unix.SockaddrInet6).Port
+
+	pid, name, path, err := FindProcess("tcp", "127.0.0.1", uint16(localPort), "127.0.0.1", uint16(listenerAddr.Port))
+	if err != nil {
+		t.Fatal(err)
+	}
+	assertCurrentProcess(t, pid, name, path)
+}
+
 func TestFindProcessDarwinUDP(t *testing.T) {
 	conn, err := stdnet.ListenUDP("udp", &stdnet.UDPAddr{IP: stdnet.ParseIP("127.0.0.1")})
 	if err != nil {
@@ -264,6 +315,18 @@ func TestDarwinSocketInfoMatchLevelFallbacks(t *testing.T) {
 	}
 }
 
+func TestDarwinSocketInfoMatchLevelIPv4Mapped(t *testing.T) {
+	src := netip.MustParseAddr("127.0.0.1")
+	dst := netip.MustParseAddr("203.0.113.10")
+	info := newDarwinSocketInfo("tcp", src, 12345, dst, 443)
+	writeDarwinNativeUint32(info, darwinSocketInfoFamilyOff, uint32(unix.AF_INET6))
+
+	level := darwinSocketInfoMatchLevel(info, "tcp", src, 12345, dst, 443, true)
+	if level != darwinSocketExactMatch {
+		t.Fatalf("unexpected match level: got %d, want %d", level, darwinSocketExactMatch)
+	}
+}
+
 func newDarwinSocketInfo(network string, local netip.Addr, localPort uint16, remote netip.Addr, remotePort uint16) []byte {
 	info := make([]byte, darwinSocketFDInfoSize)
 	switch network {

common/net/find_process_ios.go

@@ -0,0 +1,11 @@
+//go:build ios
+
+package net
+
+import (
+	"github.com/xtls/xray-core/common/errors"
+)
+
+func FindProcess(network, srcIP string, srcPort uint16, destIP string, destPort uint16) (int, string, string, error) {
+	return 0, "", "", errors.New("process lookup is not supported on this platform")
+}

common/platform/platform.go

@@ -1,6 +1,8 @@
 package platform // import "github.com/xtls/xray-core/common/platform"
 
 import (
+	"errors"
+	"fmt"
 	"os"
 	"path/filepath"
 	"strconv"
@@ -90,3 +92,49 @@ func GetConfDirPath() string {
 	configPath := NewEnvFlag(ConfdirLocation).GetValue(func() string { return "" })
 	return configPath
 }
+
+// ResolveLuaFile finds a local Lua script and returns its absolute path.
+// Relative paths: XRAY_LOCATION_CONFDIR > XRAY_LOCATION_CONFIG > working dir > executable dir.
+func ResolveLuaFile(path string) (string, error) {
+	if path == "" {
+		return "", errors.New("Lua file path is empty")
+	}
+	paths := []string{path}
+	if !filepath.IsAbs(path) {
+		paths = nil
+		for _, dir := range []string{
+			GetConfDirPath(),
+			NewEnvFlag(ConfigLocation).GetValue(func() string { return "" }),
+			".",
+			getExecutableDir(),
+		} {
+			if dir != "" {
+				paths = append(paths, filepath.Join(dir, path))
+			}
+		}
+	}
+	return resolveFile(paths)
+}
+
+func resolveFile(paths []string) (string, error) {
+	var tried []string
+	for _, path := range paths {
+		path, err := filepath.Abs(path)
+		if err != nil {
+			return "", fmt.Errorf("failed to resolve file path: %w", err)
+		}
+		tried = append(tried, path)
+		info, err := os.Stat(path)
+		if errors.Is(err, os.ErrNotExist) {
+			continue
+		}
+		if err != nil {
+			return "", fmt.Errorf("failed to inspect file %q: %w", path, err)
+		}
+		if !info.Mode().IsRegular() {
+			return "", fmt.Errorf("file is not a regular file: %s", path)
+		}
+		return path, nil
+	}
+	return "", fmt.Errorf("file not found; tried %q: %w", tried, os.ErrNotExist)
+}

common/platform/platform_test.go

@@ -1,6 +1,7 @@
 package platform_test
 
 import (
+	"errors"
 	"os"
 	"path/filepath"
 	"runtime"
@@ -64,3 +65,53 @@ func TestGetAssetLocation(t *testing.T) {
 		}
 	}
 }
+
+func TestResolveLuaFile(t *testing.T) {
+	workingDir := t.TempDir()
+	t.Chdir(workingDir)
+	executable, err := os.Executable()
+	common.Must(err)
+	file, err := os.CreateTemp(filepath.Dir(executable), "lua-*.lua")
+	common.Must(err)
+	common.Must(file.Close())
+	defer os.Remove(file.Name())
+
+	name := filepath.Base(file.Name())
+	paths := []string{
+		filepath.Join(t.TempDir(), name),
+		filepath.Join(t.TempDir(), name),
+		filepath.Join(workingDir, name),
+		file.Name(),
+	}
+	t.Setenv(ConfdirLocation, filepath.Dir(paths[0]))
+	t.Setenv(ConfigLocation, filepath.Dir(paths[1]))
+	for _, path := range paths[:3] {
+		common.Must(os.WriteFile(path, nil, 0o600))
+	}
+	if got, err := ResolveLuaFile(paths[2]); err != nil || got != paths[2] {
+		t.Fatalf("absolute path = %q, %v; want %q", got, err, paths[2])
+	}
+	for i, want := range paths {
+		if i == 2 {
+			t.Setenv(ConfdirLocation, "")
+			t.Setenv(ConfigLocation, "")
+		}
+		if got, err := ResolveLuaFile(name); err != nil || got != want {
+			t.Fatalf("resolved path = %q, %v; want %q", got, err, want)
+		}
+		common.Must(os.Remove(want))
+	}
+	if _, err := ResolveLuaFile(name); !errors.Is(err, os.ErrNotExist) {
+		t.Fatalf("missing file error = %v", err)
+	}
+
+	t.Setenv(ConfdirLocation, filepath.Dir(paths[0]))
+	t.Setenv(ConfigLocation, filepath.Dir(paths[1]))
+	common.Must(os.Mkdir(paths[0], 0o700))
+	common.Must(os.WriteFile(paths[1], nil, 0o600))
+	for _, path := range []string{"", name, filepath.Join(t.TempDir(), name)} {
+		if _, err := ResolveLuaFile(path); err == nil {
+			t.Fatalf("accepted invalid path %q", path)
+		}
+	}
+}

common/protocol/bittorrent/bittorrent.go

@@ -3,11 +3,8 @@ package bittorrent
 import (
 	"encoding/binary"
 	"errors"
-	"math"
-	"time"
 
 	"github.com/xtls/xray-core/common"
-	"github.com/xtls/xray-core/common/buf"
 )
 
 type SniffHeader struct{}
@@ -39,50 +36,44 @@ func SniffUTP(b []byte) (*SniffHeader, error) {
 		return nil, common.ErrNoClue
 	}
 
-	buffer := buf.FromBytes(b)
-
-	var typeAndVersion uint8
-
-	if binary.Read(buffer, binary.BigEndian, &typeAndVersion) != nil {
-		return nil, common.ErrNoClue
-	} else if b[0]>>4&0xF > 4 || b[0]&0xF != 1 {
+	// type 4 (ST_SYN), version 1
+	if b[0] != 0x41 {
 		return nil, errNotBittorrent
 	}
 
-	var extension uint8
-
-	if binary.Read(buffer, binary.BigEndian, &extension) != nil {
-		return nil, common.ErrNoClue
-	} else if extension != 0 && extension != 1 {
+	// timestamp_difference is always 0 in new connections
+	if binary.BigEndian.Uint32(b[8:12]) != 0 {
 		return nil, errNotBittorrent
 	}
 
+	// Walk the extension chain. Selective ack (1) and extension bits (2)
+	extension, offset := b[1], 20
 	for extension != 0 {
-		if extension != 1 {
+		if len(b) < offset+2 {
 			return nil, errNotBittorrent
 		}
-		if binary.Read(buffer, binary.BigEndian, &extension) != nil {
-			return nil, common.ErrNoClue
+		length := int(b[offset+1])
+		switch extension {
+		case 1: // selective ack
+			if length < 4 || length%4 != 0 {
+				return nil, errNotBittorrent
+			}
+		case 2: // extension bits: fixed 8 bytes, sent in ST_SYN by µTorrent
+			if length != 8 {
+				return nil, errNotBittorrent
+			}
+		default:
+			return nil, errNotBittorrent
 		}
-
-		var length uint8
-		if err := binary.Read(buffer, binary.BigEndian, &length); err != nil {
-			return nil, common.ErrNoClue
-		}
-		if common.Error2(buffer.ReadBytes(int32(length))) != nil {
-			return nil, common.ErrNoClue
+		if len(b) < offset+2+length {
+			return nil, errNotBittorrent
 		}
+		extension = b[offset]
+		offset += 2 + length
 	}
 
-	if common.Error2(buffer.ReadBytes(2)) != nil {
-		return nil, common.ErrNoClue
-	}
-
-	var timestamp uint32
-	if err := binary.Read(buffer, binary.BigEndian, &timestamp); err != nil {
-		return nil, common.ErrNoClue
-	}
-	if math.Abs(float64(time.Now().UnixMicro()-int64(timestamp))) > float64(24*time.Hour) {
+	// extensions should consume all ST_SYN payload
+	if len(b) != offset {
 		return nil, errNotBittorrent
 	}
 

common/protocol/bittorrent/bittorrent_test.go

@@ -0,0 +1,67 @@
+package bittorrent
+
+import (
+	"encoding/binary"
+	"testing"
+
+	"github.com/xtls/xray-core/common"
+)
+
+// utpPacket builds the fixed 20-byte header defined by BEP 29.
+func utpPacket(packetType, extension byte, tsDiff uint32, payload ...byte) []byte {
+	b := make([]byte, 20)
+	b[0] = packetType<<4 | 1
+	b[1] = extension
+	binary.BigEndian.PutUint16(b[2:4], 0x4a3f)     // connection_id, random
+	binary.BigEndian.PutUint32(b[4:8], 0x8c3a91d2) // timestamp_microseconds, sender's clock
+	binary.BigEndian.PutUint32(b[8:12], tsDiff)
+	binary.BigEndian.PutUint32(b[12:16], 0x00100000) // wnd_size
+	binary.BigEndian.PutUint16(b[16:18], 0x71ee)     // seq_nr, random in libutp/libtorrent
+	binary.BigEndian.PutUint16(b[18:20], 0x0000)     // ack_nr
+	return append(b, payload...)
+}
+
+func TestSniffUTP(t *testing.T) {
+	selectiveAck := []byte{0, 4, 0xff, 0x00, 0xff, 0x00}
+	wrongVersion := utpPacket(4, 0, 0)
+	wrongVersion[0] = 4<<4 | 2
+
+	cases := []struct {
+		name    string
+		payload []byte
+		err     error
+	}{
+		{"syn", utpPacket(4, 0, 0), nil},
+		{"syn with selective ack", append(utpPacket(4, 1, 0), selectiveAck...), nil},
+		{"syn with extension bits", append(utpPacket(4, 2, 0), 0, 8, 1, 2, 3, 4, 5, 6, 7, 8), nil},
+		{"extension bits with wrong length", append(utpPacket(4, 2, 0), 0, 4, 1, 2, 3, 4), errNotBittorrent},
+		{"syn with nonzero timestamp_difference", utpPacket(4, 0, 0x1234), errNotBittorrent},
+		{"syn with trailing payload", utpPacket(4, 0, 0, 'x'), errNotBittorrent},
+		// txid 0x4100, no EDNS0: the worst case colliding with the uTP header
+		{"dns query", []byte{
+			0x41, 0x00, 0x01, 0x00, 0x00, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+			0x01, 'a', 0x02, 'c', 'o', 0x00, 0x00, 0x01, 0x00, 0x01,
+		}, errNotBittorrent},
+		{"established connection packets", utpPacket(0, 0, 0x5678, 'x', 'y', 'z'), errNotBittorrent},
+		{"state", utpPacket(2, 0, 0x5678), errNotBittorrent},
+		{"fin", utpPacket(1, 0, 0x5678), errNotBittorrent},
+		{"wrong version", wrongVersion, errNotBittorrent},
+		{"unknown packet type", utpPacket(5, 0, 0), errNotBittorrent},
+		{"unknown extension", utpPacket(4, 2, 0), errNotBittorrent},
+		{"extension chain past the datagram", utpPacket(4, 1, 0, 0, 8, 0xff), errNotBittorrent},
+		{"selective ack not in multiples of 4", append(utpPacket(4, 1, 0), 0, 3, 0xff, 0x00, 0xff), errNotBittorrent},
+		{"shorter than the header", utpPacket(4, 0, 0)[:19], common.ErrNoClue},
+	}
+
+	for _, c := range cases {
+		t.Run(c.name, func(t *testing.T) {
+			h, err := SniffUTP(c.payload)
+			if err != c.err {
+				t.Fatalf("expected error %v, got %v", c.err, err)
+			}
+			if err == nil && h == nil {
+				t.Fatal("expected a sniff header, got nil")
+			}
+		})
+	}
+}

common/protocol/quic/qtls_go118.go

@@ -1,18 +1,10 @@
 package quic
 
 import (
-	"crypto"
 	"crypto/cipher"
 	_ "crypto/tls"
 	_ "unsafe"
 )
 
-type CipherSuiteTLS13 struct {
-	ID     uint16
-	KeyLen int
-	AEAD   func(key, fixedNonce []byte) cipher.AEAD
-	Hash   crypto.Hash
-}
-
 //go:linkname AEADAESGCMTLS13 crypto/tls.aeadAESGCMTLS13
 func AEADAESGCMTLS13(key, nonceMask []byte) cipher.AEAD

common/protocol/quic/sniff.go

@@ -3,7 +3,6 @@ package quic
 import (
 	"crypto"
 	"crypto/aes"
-	"crypto/tls"
 	"encoding/binary"
 	"io"
 
@@ -28,22 +27,43 @@ func (s SniffHeader) Domain() string {
 	return s.domain
 }
 
-const (
-	versionDraft29 uint32 = 0xff00001d
-	version1       uint32 = 0x1
+var (
+	errNotQUIC        = errors.New("not quic")
+	errNotQUICInitial = errors.New("not initial packet")
 )
 
+type quicVersionSpec struct {
+	ver         uint32
+	typeInitial byte
+	initialSalt []byte
+	labelPrefix string
+}
+
 var (
-	quicSaltOld  = []byte{0xaf, 0xbf, 0xec, 0x28, 0x99, 0x93, 0xd2, 0x4c, 0x9e, 0x97, 0x86, 0xf1, 0x9c, 0x61, 0x11, 0xe0, 0x43, 0x90, 0xa8, 0x99}
-	quicSalt     = []byte{0x38, 0x76, 0x2c, 0xf7, 0xf5, 0x59, 0x34, 0xb3, 0x4d, 0x17, 0x9a, 0xe6, 0xa4, 0xc8, 0x0c, 0xad, 0xcc, 0xbb, 0x7f, 0x0a}
-	initialSuite = &CipherSuiteTLS13{
-		ID:     tls.TLS_AES_128_GCM_SHA256,
-		KeyLen: 16,
-		AEAD:   AEADAESGCMTLS13,
-		Hash:   crypto.SHA256,
+	quicDraft29 = quicVersionSpec{
+		ver:         0xff00001d,
+		typeInitial: 0b00,
+		initialSalt: []byte{0xaf, 0xbf, 0xec, 0x28, 0x99, 0x93, 0xd2, 0x4c, 0x9e, 0x97, 0x86, 0xf1, 0x9c, 0x61, 0x11, 0xe0, 0x43, 0x90, 0xa8, 0x99},
+		labelPrefix: "quic",
+	}
+	quicV1 = quicVersionSpec{
+		ver:         0x1,
+		typeInitial: 0b00,
+		initialSalt: []byte{0x38, 0x76, 0x2c, 0xf7, 0xf5, 0x59, 0x34, 0xb3, 0x4d, 0x17, 0x9a, 0xe6, 0xa4, 0xc8, 0x0c, 0xad, 0xcc, 0xbb, 0x7f, 0x0a},
+		labelPrefix: "quic",
+	}
+	quicV2 = quicVersionSpec{
+		ver:         0x6b3343cf,
+		typeInitial: 0b01,
+		initialSalt: []byte{0x0d, 0xed, 0xe3, 0xde, 0xf7, 0x00, 0xa6, 0xdb, 0x81, 0x93, 0x81, 0xbe, 0x6e, 0x26, 0x9d, 0xcb, 0xf9, 0xbd, 0x2e, 0xd9},
+		labelPrefix: "quicv2",
+	}
+
+	quicVersionSpecMap = map[uint32]*quicVersionSpec{
+		quicDraft29.ver: &quicDraft29,
+		quicV1.ver:      &quicV1,
+		quicV2.ver:      &quicV2,
 	}
-	errNotQuic        = errors.New("not quic")
-	errNotQuicInitial = errors.New("not initial packet")
 )
 
 func SniffQUIC(b []byte) (*SniffHeader, error) {
@@ -63,60 +83,61 @@ func SniffQUIC(b []byte) (*SniffHeader, error) {
 		buffer := buf.FromBytes(b)
 		typeByte, err := buffer.ReadByte()
 		if err != nil {
-			return nil, errNotQuic
+			return nil, errNotQUIC
 		}
 
 		isLongHeader := typeByte&0x80 > 0
 		if !isLongHeader || typeByte&0x40 == 0 {
-			return nil, errNotQuicInitial
+			return nil, errNotQUICInitial
 		}
 
 		vb, err := buffer.ReadBytes(4)
 		if err != nil {
-			return nil, errNotQuic
+			return nil, errNotQUIC
 		}
 
 		versionNumber := binary.BigEndian.Uint32(vb)
-		if versionNumber != 0 && typeByte&0x40 == 0 {
-			return nil, errNotQuic
-		} else if versionNumber != versionDraft29 && versionNumber != version1 {
-			return nil, errNotQuic
+		var s *quicVersionSpec
+		if v, ok := quicVersionSpecMap[versionNumber]; ok {
+			s = v
+		} else {
+			return nil, errNotQUIC
 		}
 
-		packetType := (typeByte & 0x30) >> 4
-		isQuicInitial := packetType == 0x0
-
 		var destConnID []byte
 		if l, err := buffer.ReadByte(); err != nil {
-			return nil, errNotQuic
+			return nil, errNotQUIC
 		} else if destConnID, err = buffer.ReadBytes(int32(l)); err != nil {
-			return nil, errNotQuic
+			return nil, errNotQUIC
 		}
 
 		if l, err := buffer.ReadByte(); err != nil {
-			return nil, errNotQuic
+			return nil, errNotQUIC
 		} else if common.Error2(buffer.ReadBytes(int32(l))) != nil {
-			return nil, errNotQuic
+			return nil, errNotQUIC
 		}
 
-		if isQuicInitial { // Only initial packets have token, see https://datatracker.ietf.org/doc/html/rfc9000#section-17.2.2
-			tokenLen, err := readShortQuicVarint(buffer)
+		packetType := (typeByte & 0x30) >> 4
+		isQUICInitial := packetType == s.typeInitial
+
+		if isQUICInitial { // Only initial packets have token, see https://datatracker.ietf.org/doc/html/rfc9000#section-17.2.2
+			tokenLen, err := readShortQUICVarint(buffer)
 			if err != nil || tokenLen > int32(len(b)) {
-				return nil, errNotQuic
+				return nil, errNotQUIC
 			}
 
 			if _, err = buffer.ReadBytes(tokenLen); err != nil {
-				return nil, errNotQuic
+				return nil, errNotQUIC
 			}
 		}
 
-		packetLen, err := readShortQuicVarint(buffer)
+		packetLen, err := readShortQUICVarint(buffer)
 		if err != nil {
-			return nil, errNotQuic
+			return nil, errNotQUIC
 		}
 		// packetLen is impossible to be shorter than this
 		if packetLen < 4 {
-			return nil, errNotQuic
+			return nil, errNotQUIC
 		}
 
 		hdrLen := len(b) - int(buffer.Len())
@@ -125,26 +146,22 @@ func SniffQUIC(b []byte) (*SniffHeader, error) {
 		}
 
 		restPayload := b[hdrLen+int(packetLen):]
-		if !isQuicInitial { // Skip this packet if it's not initial packet
+		if !isQUICInitial { // Skip this packet if it's not initial packet
 			b = restPayload
 			continue
 		}
 
-		var salt []byte
-		if versionNumber == version1 {
-			salt = quicSalt
-		} else {
-			salt = quicSaltOld
-		}
+		salt := s.initialSalt
+		label := s.labelPrefix
 		initialSecret := hkdf.Extract(crypto.SHA256.New, destConnID, salt)
-		secret := hkdfExpandLabel(crypto.SHA256, initialSecret, []byte{}, "client in", crypto.SHA256.Size())
-		hpKey := hkdfExpandLabel(initialSuite.Hash, secret, []byte{}, "quic hp", initialSuite.KeyLen)
+		secret := hkdfExpandLabel(initialSecret, "client in", crypto.SHA256.Size())
+		hpKey := hkdfExpandLabel(secret, label+" hp", 16)
 		block, err := aes.NewCipher(hpKey)
 		if err != nil {
 			return nil, err
 		}
 		if len(b) < hdrLen+4+block.BlockSize() {
-			return nil, errNotQuic
+			return nil, errNotQUIC
 		}
 		cache.Clear()
 		mask := cache.Extend(int32(block.BlockSize()))
@@ -155,8 +172,8 @@ func SniffQUIC(b []byte) (*SniffHeader, error) {
 			b[hdrLen+i] ^= mask[i+1]
 		}
 
-		key := hkdfExpandLabel(crypto.SHA256, secret, []byte{}, "quic key", 16)
-		iv := hkdfExpandLabel(crypto.SHA256, secret, []byte{}, "quic iv", 12)
+		key := hkdfExpandLabel(secret, label+" key", 16)
+		iv := hkdfExpandLabel(secret, label+" iv", 12)
 		cipher := AEADAESGCMTLS13(key, iv)
 
 		nonce := cache.Extend(int32(cipher.NonceSize()))
@@ -181,44 +198,44 @@ func SniffQUIC(b []byte) (*SniffHeader, error) {
 			case 0x00: // PADDING frame
 			case 0x01: // PING frame
 			case 0x02, 0x03: // ACK frame
-				if _, err = readShortQuicVarint(buffer); err != nil { // Field: Largest Acknowledged
+				if _, err = readShortQUICVarint(buffer); err != nil { // Field: Largest Acknowledged
 					return nil, io.ErrUnexpectedEOF
 				}
-				if _, err = readShortQuicVarint(buffer); err != nil { // Field: ACK Delay
+				if _, err = readShortQUICVarint(buffer); err != nil { // Field: ACK Delay
 					return nil, io.ErrUnexpectedEOF
 				}
-				ackRangeCount, err := readShortQuicVarint(buffer) // Field: ACK Range Count
+				ackRangeCount, err := readShortQUICVarint(buffer) // Field: ACK Range Count
 				if err != nil {
 					return nil, io.ErrUnexpectedEOF
 				}
-				if _, err = readShortQuicVarint(buffer); err != nil { // Field: First ACK Range
+				if _, err = readShortQUICVarint(buffer); err != nil { // Field: First ACK Range
 					return nil, io.ErrUnexpectedEOF
 				}
 				for i := 0; i < int(ackRangeCount); i++ { // Field: ACK Range
-					if _, err = readShortQuicVarint(buffer); err != nil { // Field: ACK Range -> Gap
+					if _, err = readShortQUICVarint(buffer); err != nil { // Field: ACK Range -> Gap
 						return nil, io.ErrUnexpectedEOF
 					}
-					if _, err = readShortQuicVarint(buffer); err != nil { // Field: ACK Range -> ACK Range Length
+					if _, err = readShortQUICVarint(buffer); err != nil { // Field: ACK Range -> ACK Range Length
 						return nil, io.ErrUnexpectedEOF
 					}
 				}
 				if frameType == 0x03 {
-					if _, err = readShortQuicVarint(buffer); err != nil { // Field: ECN Counts -> ECT0 Count
+					if _, err = readShortQUICVarint(buffer); err != nil { // Field: ECN Counts -> ECT0 Count
 						return nil, io.ErrUnexpectedEOF
 					}
-					if _, err = readShortQuicVarint(buffer); err != nil { // Field: ECN Counts -> ECT1 Count
+					if _, err = readShortQUICVarint(buffer); err != nil { // Field: ECN Counts -> ECT1 Count
 						return nil, io.ErrUnexpectedEOF
 					}
-					if _, err = readShortQuicVarint(buffer); err != nil { //nolint:misspell // Field: ECN Counts -> ECT-CE Count
+					if _, err = readShortQUICVarint(buffer); err != nil { //nolint:misspell // Field: ECN Counts -> ECT-CE Count
 						return nil, io.ErrUnexpectedEOF
 					}
 				}
 			case 0x06: // CRYPTO frame, we will use this frame
-				offset, err := readShortQuicVarint(buffer) // Field: Offset
+				offset, err := readShortQUICVarint(buffer) // Field: Offset
 				if err != nil {
 					return nil, io.ErrUnexpectedEOF
 				}
-				length, err := readShortQuicVarint(buffer) // Field: Length
+				length, err := readShortQUICVarint(buffer) // Field: Length
 				if err != nil || length > buffer.Len() {
 					return nil, io.ErrUnexpectedEOF
 				}
@@ -234,13 +251,13 @@ func SniffQUIC(b []byte) (*SniffHeader, error) {
 					return nil, io.ErrUnexpectedEOF
 				}
 			case 0x1c: // CONNECTION_CLOSE frame, only 0x1c is permitted in initial packet
-				if _, err = readShortQuicVarint(buffer); err != nil { // Field: Error Code
+				if _, err = readShortQUICVarint(buffer); err != nil { // Field: Error Code
 					return nil, io.ErrUnexpectedEOF
 				}
-				if _, err = readShortQuicVarint(buffer); err != nil { // Field: Frame Type
+				if _, err = readShortQUICVarint(buffer); err != nil { // Field: Frame Type
 					return nil, io.ErrUnexpectedEOF
 				}
-				length, err := readShortQuicVarint(buffer) // Field: Reason Phrase Length
+				length, err := readShortQUICVarint(buffer) // Field: Reason Phrase Length
 				if err != nil {
 					return nil, io.ErrUnexpectedEOF
 				}
@@ -250,7 +267,7 @@ func SniffQUIC(b []byte) (*SniffHeader, error) {
 			default:
 				// Only above frame types are permitted in initial packet.
 				// See https://www.rfc-editor.org/rfc/rfc9000.html#section-17.2.2-8
-				return nil, errNotQuicInitial
+				return nil, errNotQUICInitial
 			}
 		}
 
@@ -268,35 +285,33 @@ func SniffQUIC(b []byte) (*SniffHeader, error) {
 	return nil, protocol.ErrProtoNeedMoreData
 }
 
-func hkdfExpandLabel(hash crypto.Hash, secret, context []byte, label string, length int) []byte {
-	b := make([]byte, 3, 3+6+len(label)+1+len(context))
-	binary.BigEndian.PutUint16(b, uint16(length))
-	b[2] = uint8(6 + len(label))
-	b = append(b, []byte("tls13 ")...)
-	b = append(b, []byte(label)...)
-	b = b[:3+6+len(label)+1]
-	b[3+6+len(label)] = uint8(len(context))
-	b = append(b, context...)
+func hkdfExpandLabel(secret []byte, label string, length int) []byte {
+	b := make([]byte, 0, 2+1+6+len(label)+1)
+	b = binary.BigEndian.AppendUint16(b, uint16(length))
+	b = append(b, byte(6+len(label)))
+	b = append(b, "tls13 "...)
+	b = append(b, label...)
+	b = append(b, 0) // context
 
 	out := make([]byte, length)
-	n, err := hkdf.Expand(hash.New, secret, b).Read(out)
+	n, err := hkdf.Expand(crypto.SHA256.New, secret, b).Read(out)
 	if err != nil || n != length {
 		panic("quic: HKDF-Expand-Label invocation failed unexpectedly")
 	}
 	return out
 }
 
-// readShortQuicVarint wraps quicvarint.Read with a max limit for length related fields.
+// readShortQUICVarint wraps quicvarint.Read with a max limit for length related fields.
 // we only handle QUIC Initial so these numbers should not exceed 65535
 // returns int32 to reduce type conversion
-func readShortQuicVarint(reader io.ByteReader) (int32, error) {
+func readShortQUICVarint(reader io.ByteReader) (int32, error) {
 	v, err := quicvarint.Read(reader)
 	if err != nil {
 		return 0, err
 	}
 	if v > 65535 {
 		// not used(
-		return 0, errNotQuicInitial
+		return 0, errNotQUICInitial
 	}
 	return int32(v), nil
 }

common/reflect/marshal_test.go

@@ -207,6 +207,7 @@ func getConfig() string {
       "tag": "XHTTP_IN",
       "streamSettings": {
         "network": "xhttp",
+		"security": "tls",
         "xhttpSettings": {
           "host": "bing.com",
           "path": "/xhttp_client_upload",

common/session/session.go

@@ -70,8 +70,6 @@ type Outbound struct {
 	Tag string
 	// Name of the outbound proxy that handles the connection.
 	Name string
-	// Unused. Conn is actually internet.Connection. May be nil. It is currently nil for outbound with proxySettings
-	Conn net.Conn
 	// CanSpliceCopy is a property for this connection
 	// 1 = can, 2 = after processing protocol info should be able to, 3 = cannot
 	CanSpliceCopy int

core/core.go

@@ -19,8 +19,8 @@ import (
 
 var (
 	Version_x byte = 26
-	Version_y byte = 7
-	Version_z byte = 11
+	Version_y byte = 9
+	Version_z byte = 9
 )
 
 var (

go.mod

@@ -1,62 +1,67 @@
 module github.com/xtls/xray-core
 
-go 1.26
+go 1.27
 
 require (
-	github.com/apernet/quic-go v0.59.1-0.20260425001925-6c6cc9bcb716
-	github.com/cloudflare/circl v1.6.4
+	github.com/apernet/quic-go v0.61.1-0.20260806010916-184d081eef3e
+	github.com/cloudflare/circl v1.6.5
 	github.com/ghodss/yaml v1.0.1-0.20220118164431-d8423dcdf344
 	github.com/golang/mock v1.7.0-rc.1
 	github.com/google/go-cmp v0.7.0
 	github.com/google/uuid v1.6.0
 	github.com/gorilla/websocket v1.5.3
 	github.com/klauspost/cpuid/v2 v2.4.0
-	github.com/miekg/dns v1.1.72
+	github.com/libp2p/go-nat v1.0.1-0.20250821073202-01afc089f138
+	github.com/miekg/dns v1.1.73
 	github.com/pelletier/go-toml v1.9.5
-	github.com/pion/stun/v3 v3.1.6
+	github.com/pion/stun/v3 v3.1.7
 	github.com/pires/go-proxyproto v0.15.0
 	github.com/refraction-networking/utls v1.8.3-0.20260301010127-aa6edf4b11af
 	github.com/robfig/cron/v3 v3.0.1
 	github.com/sagernet/sing v0.5.1
 	github.com/sagernet/sing-shadowsocks v0.2.7
-	github.com/stretchr/testify v1.11.1
+	github.com/stretchr/testify v1.12.1
 	github.com/vishvananda/netlink v1.3.1
-	github.com/xtls/reality v0.0.0-20260322125925-9234c772ba8f
+	github.com/xtls/reality v0.0.0-20260908062103-8cdf7bf9c7f0
+	github.com/yuin/gopher-lua v1.1.2
 	go4.org/netipx v0.0.0-20231129151722-fdeea329fbba
-	golang.org/x/crypto v0.54.0
+	golang.org/x/crypto v0.57.0
 	golang.org/x/exp v0.0.0-20240506185415-9bf2ced13842
-	golang.org/x/net v0.57.0
-	golang.org/x/sync v0.22.0
-	golang.org/x/sys v0.47.0
+	golang.org/x/net v0.59.0
+	golang.org/x/sync v0.23.0
+	golang.org/x/sys v0.48.0
 	golang.zx2c4.com/wintun v0.0.0-20230126152724-0fa3db229ce2
 	golang.zx2c4.com/wireguard v0.0.0-20250521234502-f333402bd9cb
-	golang.zx2c4.com/wireguard/windows v1.0.1
-	google.golang.org/grpc v1.82.1
-	google.golang.org/protobuf v1.36.11
+	golang.zx2c4.com/wireguard/windows v1.1.1
+	google.golang.org/grpc v1.84.0
+	google.golang.org/protobuf v1.36.12
 	gvisor.dev/gvisor v0.0.0-20260122175437-89a5d21be8f0
 	h12.io/socks v1.0.3
+	layeh.com/gopher-luar v1.0.11
 	lukechampine.com/blake3 v1.4.1
+	mvdan.cc/gofumpt v0.12.0
 )
 
 require (
 	github.com/andybalholm/brotli v1.0.6 // indirect
-	github.com/davecgh/go-spew v1.1.1 // indirect
 	github.com/google/btree v1.1.2 // indirect
+	github.com/google/gopacket v1.1.19 // indirect
+	github.com/huin/goupnp v1.2.0 // indirect
+	github.com/jackpal/go-nat-pmp v1.0.2 // indirect
 	github.com/juju/ratelimit v1.0.2 // indirect
 	github.com/klauspost/compress v1.17.4 // indirect
-	github.com/kr/text v0.2.0 // indirect
-	github.com/pion/dtls/v3 v3.1.4 // indirect
+	github.com/koron/go-ssdp v0.0.4 // indirect
+	github.com/libp2p/go-netroute v0.2.1 // indirect
+	github.com/pion/dtls/v3 v3.1.5 // indirect
 	github.com/pion/logging v0.2.4 // indirect
-	github.com/pion/transport/v4 v4.0.2 // indirect
-	github.com/pmezard/go-difflib v1.0.0 // indirect
+	github.com/pion/transport/v4 v4.1.0 // indirect
 	github.com/quic-go/qpack v0.6.0 // indirect
 	github.com/vishvananda/netns v0.0.5 // indirect
 	github.com/wlynxg/anet v0.0.5 // indirect
-	golang.org/x/mod v0.37.0 // indirect
-	golang.org/x/text v0.40.0 // indirect
+	go.yaml.in/yaml/v3 v3.0.5 // indirect
+	golang.org/x/text v0.42.0 // indirect
 	golang.org/x/time v0.14.0 // indirect
-	golang.org/x/tools v0.47.0 // indirect
-	google.golang.org/genproto/googleapis/rpc v0.0.0-20260414002931-afd174a4e478 // indirect
+	golang.org/x/tools v0.49.0 // indirect
+	google.golang.org/genproto/googleapis/rpc v0.0.0-20260706201446-f0a921348800 // indirect
 	gopkg.in/yaml.v2 v2.4.0 // indirect
-	gopkg.in/yaml.v3 v3.0.1 // indirect
 )

go.sum

@@ -1,20 +1,16 @@
 github.com/andybalholm/brotli v1.0.6 h1:Yf9fFpf49Zrxb9NlQaluyE92/+X7UVHlhMNJN2sxfOI=
 github.com/andybalholm/brotli v1.0.6/go.mod h1:fO7iG3H7G2nSZ7m0zPUDn85XEX2GTukHGRSepvi9Eig=
-github.com/apernet/quic-go v0.59.1-0.20260425001925-6c6cc9bcb716 h1:J1O+xpLuJWkdYbw5JPGwBqIHs2J8tiEP7Py9lPqkN2I=
-github.com/apernet/quic-go v0.59.1-0.20260425001925-6c6cc9bcb716/go.mod h1:Npbg8qBtAZlsAB3FWmqwlVh5jtVG6a4DlYsOylUpvzA=
-github.com/cespare/xxhash/v2 v2.3.0 h1:UL815xU9SqsFlibzuggzjXhog7bL6oX9BbNZnL2UFvs=
-github.com/cespare/xxhash/v2 v2.3.0/go.mod h1:VGX0DQ3Q6kWi7AoAeZDth3/j3BFtOZR5XLFGgcrjCOs=
-github.com/cloudflare/circl v1.6.4 h1:pOXuDTCEYyzydgUpQ0CQz3LsinKjiSk6nNP5Lt5K64U=
-github.com/cloudflare/circl v1.6.4/go.mod h1:YxarevkLlbaHuWsxG6vmYNWBEsSp4pnp7j+4VljMavY=
-github.com/creack/pty v1.1.9/go.mod h1:oKZEueFk5CKHvIhNR5MUki03XCEU+Q6VDXinZuGJ33E=
-github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
-github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
+github.com/apernet/quic-go v0.61.1-0.20260806010916-184d081eef3e h1:5mgtR5gwIgBKMiGI1QdXldZZ+SNor06Nbu1wCBulQBg=
+github.com/apernet/quic-go v0.61.1-0.20260806010916-184d081eef3e/go.mod h1:x7qxEvX6MCVtDuBKHj3E+88+BtrbEMuAL5qGUKItjW8=
+github.com/chzyer/logex v1.1.10/go.mod h1:+Ywpsq7O8HXn0nuIou7OrIPyXbp3wmkHB+jjWRnGsAI=
+github.com/chzyer/readline v0.0.0-20180603132655-2972be24d48e/go.mod h1:nSuG5e5PlCu98SY8svDHJxuZscDgtXS6KTTbou5AhLI=
+github.com/chzyer/test v0.0.0-20180213035817-a1ea475d72b1/go.mod h1:Q3SI9o4m/ZMnBNeIyt5eFwwo7qiLfzFZmjNmxjkiQlU=
+github.com/cloudflare/circl v1.6.5 h1:O64F26HEqNhznd/hrC5KZXVKYuKM2rx4deZDTc4ihQA=
+github.com/cloudflare/circl v1.6.5/go.mod h1:h5LNyxAc5nTue9DS5jT+48en2PSDYt3zdGnz5OstK6c=
 github.com/ghodss/yaml v1.0.1-0.20220118164431-d8423dcdf344 h1:Arcl6UOIS/kgO2nW3A65HN+7CMjSDP/gofXL4CZt1V4=
 github.com/ghodss/yaml v1.0.1-0.20220118164431-d8423dcdf344/go.mod h1:GIjDIg/heH5DOkXY3YJ/wNhfHsQHoXGjl8G8amsYQ1I=
-github.com/go-logr/logr v1.4.3 h1:CjnDlHq8ikf6E492q6eKboGOC0T8CDaOvkHCIg8idEI=
-github.com/go-logr/logr v1.4.3/go.mod h1:9T104GzyrTigFIr8wt5mBrctHMim0Nb2HLGrmQ40KvY=
-github.com/go-logr/stdr v1.2.2 h1:hSWxHoqTgW2S2qGc0LTAI563KZ5YKYRhT3MFKZMbjag=
-github.com/go-logr/stdr v1.2.2/go.mod h1:mMo/vtBO5dYbehREoey6XUKy/eSumjCCveDpRre4VKE=
+github.com/go-quicktest/qt v1.102.0 h1:HSQxCeh5YZH3EL3W39ixjtyaEhcWSXQHtHnMBzSs474=
+github.com/go-quicktest/qt v1.102.0/go.mod h1:p4lGIVX+8Wa6ZPNDvqcxq36XpUDLh42FLetFU7odllI=
 github.com/golang/mock v1.7.0-rc.1 h1:YojYx61/OLFsiv6Rw1Z96LpldJIy31o+UHmwAUMJ6/U=
 github.com/golang/mock v1.7.0-rc.1/go.mod h1:s42URUywIqd+OcERslBJvOjepvNymP31m3q8d/GkuRs=
 github.com/golang/protobuf v1.5.4 h1:i7eJL8qZTpSEXOPTxNKhASYpMn+8e5Q6AdndVa1dWek=
@@ -23,97 +19,103 @@ github.com/google/btree v1.1.2 h1:xf4v41cLI2Z6FxbKm+8Bu+m8ifhj15JuZ9sa0jZCMUU=
 github.com/google/btree v1.1.2/go.mod h1:qOPhT0dTNdNzV6Z/lhRX0YXUafgPLFUh+gZMl761Gm4=
 github.com/google/go-cmp v0.7.0 h1:wk8382ETsv4JYUZwIsn6YpYiWiBsYLSJiTsyBybVuN8=
 github.com/google/go-cmp v0.7.0/go.mod h1:pXiqmnSA92OHEEa9HXL2W4E7lf9JzCmGVUdgjX3N/iU=
+github.com/google/gopacket v1.1.19 h1:ves8RnFZPGiFnTS0uPQStjwru6uO6h+nlr9j6fL7kF8=
+github.com/google/gopacket v1.1.19/go.mod h1:iJ8V8n6KS+z2U1A8pUwu8bW5SyEMkXJB8Yo/Vo+TKTo=
 github.com/google/uuid v1.6.0 h1:NIvaJDMOsjHA8n1jAhLSgzrAzy1Hgr+hNrb57e+94F0=
 github.com/google/uuid v1.6.0/go.mod h1:TIyPZe4MgqvfeYDBFedMoGGpEw/LqOeaOT+nhxU+yHo=
 github.com/gorilla/websocket v1.5.3 h1:saDtZ6Pbx/0u+bgYQ3q96pZgCzfhKXGPqt7kZ72aNNg=
 github.com/gorilla/websocket v1.5.3/go.mod h1:YR8l580nyteQvAITg2hZ9XVh4b55+EU/adAjf1fMHhE=
 github.com/h12w/go-socks5 v0.0.0-20200522160539-76189e178364 h1:5XxdakFhqd9dnXoAZy1Mb2R/DZ6D1e+0bGC/JhucGYI=
 github.com/h12w/go-socks5 v0.0.0-20200522160539-76189e178364/go.mod h1:eDJQioIyy4Yn3MVivT7rv/39gAJTrA7lgmYr8EW950c=
+github.com/huin/goupnp v1.2.0 h1:uOKW26NG1hsSSbXIZ1IR7XP9Gjd1U8pnLaCMgntmkmY=
+github.com/huin/goupnp v1.2.0/go.mod h1:gnGPsThkYa7bFi/KWmEysQRf48l2dvR5bxr2OFckNX8=
+github.com/jackpal/go-nat-pmp v1.0.2 h1:KzKSgb7qkJvOUTqYl9/Hg/me3pWgBmERKrTGD7BdWus=
+github.com/jackpal/go-nat-pmp v1.0.2/go.mod h1:QPH045xvCAeXUZOxsnwmrtiCoxIr9eob+4orBN1SBKc=
 github.com/juju/ratelimit v1.0.2 h1:sRxmtRiajbvrcLQT7S+JbqU0ntsb9W2yhSdNN8tWfaI=
 github.com/juju/ratelimit v1.0.2/go.mod h1:qapgC/Gy+xNh9UxzV13HGGl/6UXNN+ct+vwSgWNm/qk=
 github.com/klauspost/compress v1.17.4 h1:Ej5ixsIri7BrIjBkRZLTo6ghwrEtHFk7ijlczPW4fZ4=
 github.com/klauspost/compress v1.17.4/go.mod h1:/dCuZOvVtNoHsyb+cuJD3itjs3NbnF6KH9zAO4BDxPM=
 github.com/klauspost/cpuid/v2 v2.4.0 h1:S6Hrbc7+ywsr0r+RLapfGBHfyefhCTwEh3A0tV913Dw=
 github.com/klauspost/cpuid/v2 v2.4.0/go.mod h1:19jmZ9mjzoF//ddRSUsv0zfBTJWh3QJh9FNxZTMrGxU=
+github.com/koron/go-ssdp v0.0.4 h1:1IDwrghSKYM7yLf7XCzbByg2sJ/JcNOZRXS2jczTwz0=
+github.com/koron/go-ssdp v0.0.4/go.mod h1:oDXq+E5IL5q0U8uSBcoAXzTzInwy5lEgC91HoKtbmZk=
 github.com/kr/pretty v0.3.1 h1:flRD4NNwYAUpkphVc1HcthR4KEIFJ65n8Mw5qdRn3LE=
 github.com/kr/pretty v0.3.1/go.mod h1:hoEshYVHaxMs3cyo3Yncou5ZscifuDolrwPKZanG3xk=
 github.com/kr/text v0.2.0 h1:5Nx0Ya0ZqY2ygV366QzturHI13Jq95ApcVaJBhpS+AY=
 github.com/kr/text v0.2.0/go.mod h1:eLer722TekiGuMkidMxC/pM04lWEeraHUUmBw8l2grE=
-github.com/miekg/dns v1.1.72 h1:vhmr+TF2A3tuoGNkLDFK9zi36F2LS+hKTRW0Uf8kbzI=
-github.com/miekg/dns v1.1.72/go.mod h1:+EuEPhdHOsfk6Wk5TT2CzssZdqkmFhf8r+aVyDEToIs=
+github.com/libp2p/go-nat v1.0.1-0.20250821073202-01afc089f138 h1:YohuNPT/1k3VcThCQlBZ43PCPWPfMRS1zcxWBF2SLK8=
+github.com/libp2p/go-nat v1.0.1-0.20250821073202-01afc089f138/go.mod h1:TXQg5tfSy+bUjnhT5728j5j/MBj7keIYqqZ1+8k/ui8=
+github.com/libp2p/go-netroute v0.2.1 h1:V8kVrpD8GK0Riv15/7VN6RbUQ3URNZVosw7H2v9tksU=
+github.com/libp2p/go-netroute v0.2.1/go.mod h1:hraioZr0fhBjG0ZRXJJ6Zj2IVEVNx6tDTFQfSmcq7mQ=
+github.com/miekg/dns v1.1.73 h1:uhT8nJxmTrPJYClxVxTCX+CVn6qnzSiybRk72Z6DgrE=
+github.com/miekg/dns v1.1.73/go.mod h1:RW2Obtfd5NZHvOFe3zYG0W8koWOQtAzyHaLo8vASBuQ=
 github.com/pelletier/go-toml v1.9.5 h1:4yBQzkHv+7BHq2PQUZF3Mx0IYxG7LsP222s7Agd3ve8=
 github.com/pelletier/go-toml v1.9.5/go.mod h1:u1nR/EPcESfeI/szUZKdtJ0xRNbUoANCkoOuaOx1Y+c=
 github.com/phayes/freeport v0.0.0-20180830031419-95f893ade6f2 h1:JhzVVoYvbOACxoUmOs6V/G4D5nPVUW73rKvXxP4XUJc=
 github.com/phayes/freeport v0.0.0-20180830031419-95f893ade6f2/go.mod h1:iIss55rKnNBTvrwdmkUpLnDpZoAHvWaiq5+iMmen4AE=
-github.com/pion/dtls/v3 v3.1.4 h1:QhvtMflMfu9Kf0RcDC5BJBle4caPskByrKQR6uuYqpY=
-github.com/pion/dtls/v3 v3.1.4/go.mod h1:cr/qotLISUw/9C1m83ZPNZtj9WnXkYLpfCptPqbkInc=
+github.com/pion/dtls/v3 v3.1.5 h1:9xJtVsHwMYeSjPp5Hh1FTis4DchnQWtnOa5o+6ygqfc=
+github.com/pion/dtls/v3 v3.1.5/go.mod h1:gz1K4jg6c+fq86oQMH4pilpCEOEPwmEr2jY+VcF/mkU=
 github.com/pion/logging v0.2.4 h1:tTew+7cmQ+Mc1pTBLKH2puKsOvhm32dROumOZ655zB8=
 github.com/pion/logging v0.2.4/go.mod h1:DffhXTKYdNZU+KtJ5pyQDjvOAh/GsNSyv1lbkFbe3so=
-github.com/pion/stun/v3 v3.1.6 h1:WnhsD0eHCiwCfKNkVx0VJJwr2Y3eV4Ueih3KJ+dfZy8=
-github.com/pion/stun/v3 v3.1.6/go.mod h1:zRUghXSQU32Lx5orJsz3uYMkIihweXb3mu5gIns02fs=
-github.com/pion/transport/v4 v4.0.2 h1:ifYlPqNwsy6aKQ9y8yzxXlHae5431ZrH2avkD/Rn6Tk=
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@@ -121,21 +123,22 @@ golang.org/x/sys v0.0.0-20210423082822-04245dca01da/go.mod h1:h1NjWce9XRLGQEsW7w
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@@ -143,27 +146,29 @@ golang.zx2c4.com/wintun v0.0.0-20230126152724-0fa3db229ce2 h1:B82qJJgjvYKsXS9jeu
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 gonum.org/v1/gonum v0.17.0/go.mod h1:El3tOrEuMpv2UdMrbNlKEh9vd86bmQ6vqIcDwxEOc1E=
-google.golang.org/genproto/googleapis/rpc v0.0.0-20260414002931-afd174a4e478 h1:RmoJA1ujG+/lRGNfUnOMfhCy5EipVMyvUE+KNbPbTlw=
-google.golang.org/genproto/googleapis/rpc v0.0.0-20260414002931-afd174a4e478/go.mod h1:4Hqkh8ycfw05ld/3BWL7rJOSfebL2Q+DVDeRgYgxUU8=
-google.golang.org/grpc v1.82.1 h1:NnAxzGRA0677vCa4BUkOAnO5+FfQqVl9iUXeD0IqcGE=
-google.golang.org/grpc v1.82.1/go.mod h1:yzTZ1TB1Z3SG+LIYaI+WiE8D5+PZ3ArnrSp8zF3+/ZA=
-google.golang.org/protobuf v1.36.11 h1:fV6ZwhNocDyBLK0dj+fg8ektcVegBBuEolpbTQyBNVE=
-google.golang.org/protobuf v1.36.11/go.mod h1:HTf+CrKn2C3g5S8VImy6tdcUvCska2kB7j23XfzDpco=
+google.golang.org/genproto/googleapis/rpc v0.0.0-20260706201446-f0a921348800 h1:qEHAMpSaUhtD0p3NbEEI83HwNGFxEwaSJ1G9PLnCBZE=
+google.golang.org/genproto/googleapis/rpc v0.0.0-20260706201446-f0a921348800/go.mod h1:4Hqkh8ycfw05ld/3BWL7rJOSfebL2Q+DVDeRgYgxUU8=
+google.golang.org/grpc v1.84.0 h1:soMyaPJ8pAak5PIQ0DGBUir0XRo2fRoMqhNWMLlLxO0=
+google.golang.org/grpc v1.84.0/go.mod h1:ljCht0DrxQrXBDRTZp52Qxh3Ffk8CdYm2sj4O2QN2C0=
+google.golang.org/protobuf v1.36.12 h1:pJOKDDOyeXErUroCihFAd5LQuwXBSpVnKGrj5o/fwxc=
+google.golang.org/protobuf v1.36.12/go.mod h1:HTf+CrKn2C3g5S8VImy6tdcUvCska2kB7j23XfzDpco=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
 gopkg.in/check.v1 v1.0.0-20201130134442-10cb98267c6c h1:Hei/4ADfdWqJk1ZMxUNpqntNwaWcugrBjAiHlqqRiVk=
 gopkg.in/check.v1 v1.0.0-20201130134442-10cb98267c6c/go.mod h1:JHkPIbrfpd72SG/EVd6muEfDQjcINNoR0C8j2r3qZ4Q=
 gopkg.in/yaml.v2 v2.2.2/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
 gopkg.in/yaml.v2 v2.4.0 h1:D8xgwECY7CYvx+Y2n4sBz93Jn9JRvxdiyyo8CTfuKaY=
 gopkg.in/yaml.v2 v2.4.0/go.mod h1:RDklbk79AGWmwhnvt/jBztapEOGDOx6ZbXqjP6csGnQ=
-gopkg.in/yaml.v3 v3.0.1 h1:fxVm/GzAzEWqLHuvctI91KS9hhNmmWOoWu0XTYJS7CA=
-gopkg.in/yaml.v3 v3.0.1/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
 gvisor.dev/gvisor v0.0.0-20260122175437-89a5d21be8f0 h1:Lk6hARj5UPY47dBep70OD/TIMwikJ5fGUGX0Rm3Xigk=
 gvisor.dev/gvisor v0.0.0-20260122175437-89a5d21be8f0/go.mod h1:QkHjoMIBaYtpVufgwv3keYAbln78mBoCuShZrPrer1Q=
 h12.io/socks v1.0.3 h1:Ka3qaQewws4j4/eDQnOdpr4wXsC//dXtWvftlIcCQUo=
 h12.io/socks v1.0.3/go.mod h1:AIhxy1jOId/XCz9BO+EIgNL2rQiPTBNnOfnVnQ+3Eck=
+layeh.com/gopher-luar v1.0.11 h1:8zJudpKI6HWkoh9eyyNFaTM79PY6CAPcIr6X/KTiliw=
+layeh.com/gopher-luar v1.0.11/go.mod h1:TPnIVCZ2RJBndm7ohXyaqfhzjlZ+OA2SZR/YwL8tECk=
 lukechampine.com/blake3 v1.4.1 h1:I3Smz7gso8w4/TunLKec6K2fn+kyKtDxr/xcQEN84Wg=
 lukechampine.com/blake3 v1.4.1/go.mod h1:QFosUxmjB8mnrWFSNwKmvxHpfY72bmD2tQ0kBMM3kwo=
+mvdan.cc/gofumpt v0.12.0 h1:1Lbudkz2kpM9Cjz2pL4M19u7q+GaEhCTNf7N9mfpcho=
+mvdan.cc/gofumpt v0.12.0/go.mod h1:SmBHHrljiZu/uoypeKup3rFzP6eoC9UwCp2iH5E3jZA=

infra/conf/blackhole.go

@@ -1,52 +1,42 @@
 package conf
 
 import (
-	"encoding/json"
+	"encoding/base64"
+	"strings"
 
 	"github.com/xtls/xray-core/common/errors"
-	"github.com/xtls/xray-core/common/serial"
 	"github.com/xtls/xray-core/proxy/blackhole"
 	"google.golang.org/protobuf/proto"
 )
 
-type NoneResponse struct{}
-
-func (*NoneResponse) Build() (proto.Message, error) {
-	return new(blackhole.NoneResponse), nil
-}
-
-type HTTPResponse struct{}
-
-func (*HTTPResponse) Build() (proto.Message, error) {
-	return new(blackhole.HTTPResponse), nil
+type ResponseConfig struct {
+	Type               string `json:"type"`
+	CustomResponseData string `json:"customResponseData"`
 }
 
 type BlackholeConfig struct {
-	Response json.RawMessage `json:"response"`
+	Response *ResponseConfig `json:"response"`
 }
 
 func (v *BlackholeConfig) Build() (proto.Message, error) {
 	config := new(blackhole.Config)
 	if v.Response != nil {
-		response, _, err := configLoader.Load(v.Response)
-		if err != nil {
-			return nil, errors.New("Config: Failed to parse Blackhole response config.").Base(err)
+		responseName := strings.ToLower(v.Response.Type)
+		switch responseName {
+		case "none", "":
+			config.Response = &blackhole.Response{Type: "none"}
+		case "http":
+			config.Response = &blackhole.Response{Type: "http"}
+		case "custom":
+			data, err := base64.StdEncoding.DecodeString(v.Response.CustomResponseData)
+			if err != nil {
+				return nil, errors.New("failed to decode custom response data: " + err.Error())
+			}
+			config.Response = &blackhole.Response{Type: "custom", CustomResponseData: data}
+		default:
+			return nil, errors.New("unknown blackhole response: " + responseName)
 		}
-		responseSettings, err := response.(Buildable).Build()
-		if err != nil {
-			return nil, err
-		}
-		config.Response = serial.ToTypedMessage(responseSettings)
 	}
 
 	return config, nil
 }
-
-var configLoader = NewJSONConfigLoader(
-	ConfigCreatorCache{
-		"none": func() interface{} { return new(NoneResponse) },
-		"http": func() interface{} { return new(HTTPResponse) },
-	},
-	"type",
-	"",
-)

infra/conf/blackhole_test.go

@@ -3,7 +3,6 @@ package conf_test
 import (
 	"testing"
 
-	"github.com/xtls/xray-core/common/serial"
 	. "github.com/xtls/xray-core/infra/conf"
 	"github.com/xtls/xray-core/proxy/blackhole"
 )
@@ -22,7 +21,7 @@ func TestHTTPResponseJSON(t *testing.T) {
 			}`,
 			Parser: loadJSON(creator),
 			Output: &blackhole.Config{
-				Response: serial.ToTypedMessage(&blackhole.HTTPResponse{}),
+				Response: &blackhole.Response{Type: "http"},
 			},
 		},
 		{
@@ -32,3 +31,27 @@ func TestHTTPResponseJSON(t *testing.T) {
 		},
 	})
 }
+
+func TestCustomResponseJSON(t *testing.T) {
+	creator := func() Buildable {
+		return new(BlackholeConfig)
+	}
+
+	runMultiTestCase(t, []TestCase{
+		{
+			Input: `{
+				"response": {
+					"type": "custom",
+					"customResponseData": "Y3VzdG9tIHJlc3BvbnNl"
+				}
+			}`,
+			Parser: loadJSON(creator),
+			Output: &blackhole.Config{
+				Response: &blackhole.Response{
+					Type:               "custom",
+					CustomResponseData: []byte("custom response"),
+				},
+			},
+		},
+	})
+}

infra/conf/common.go

@@ -65,6 +65,9 @@ func (v *Address) UnmarshalJSON(data []byte) error {
 }
 
 func (v *Address) Build() *net.IPOrDomain {
+	if v == nil {
+		return nil
+	}
 	return net.NewIPOrDomain(v.Address)
 }
 

infra/conf/dns.go

@@ -14,9 +14,11 @@ import (
 	"github.com/xtls/xray-core/common/errors"
 	"github.com/xtls/xray-core/common/geodata"
 	"github.com/xtls/xray-core/common/net"
+	"github.com/xtls/xray-core/common/platform"
 )
 
 type NameServerConfig struct {
+	ID              string     `json:"id"`
 	Address         *Address   `json:"address"`
 	ClientIP        *Address   `json:"clientIp"`
 	Port            uint16     `json:"port"`
@@ -43,6 +45,7 @@ func (c *NameServerConfig) UnmarshalJSON(data []byte) error {
 	}
 
 	var advanced struct {
+		ID              string     `json:"id"`
 		Address         *Address   `json:"address"`
 		ClientIP        *Address   `json:"clientIp"`
 		Port            uint16     `json:"port"`
@@ -60,6 +63,7 @@ func (c *NameServerConfig) UnmarshalJSON(data []byte) error {
 		UnexpectedIPs   StringList `json:"unexpectedIPs"`
 	}
 	if err := json.Unmarshal(data, &advanced); err == nil {
+		c.ID = advanced.ID
 		c.Address = advanced.Address
 		c.ClientIP = advanced.ClientIP
 		c.Port = advanced.Port
@@ -134,6 +138,7 @@ func (c *NameServerConfig) Build() (*dns.NameServer, error) {
 	}
 
 	return &dns.NameServer{
+		Id: c.ID,
 		Address: &net.Endpoint{
 			Network: net.Network_UDP,
 			Address: c.Address.Build(),
@@ -159,6 +164,7 @@ func (c *NameServerConfig) Build() (*dns.NameServer, error) {
 // DNSConfig is a JSON serializable object for dns.Config
 type DNSConfig struct {
 	Servers                []*NameServerConfig `json:"servers"`
+	Script                 string              `json:"script"`
 	Hosts                  *HostsWrapper       `json:"hosts"`
 	ClientIP               *Address            `json:"clientIp"`
 	Tag                    string              `json:"tag"`
@@ -278,6 +284,14 @@ func (c *DNSConfig) Build() (*dns.Config, error) {
 		QueryStrategy:          resolveQueryStrategy(c.QueryStrategy),
 	}
 
+	if c.Script != "" {
+		path, err := platform.ResolveLuaFile(c.Script)
+		if err != nil {
+			return nil, errors.New("failed to resolve DNS script: ", c.Script).Base(err)
+		}
+		config.Script = path
+	}
+
 	if c.ClientIP != nil {
 		if !c.ClientIP.Family().IsIP() {
 			return nil, errors.New("not an IP address:", c.ClientIP.String())

infra/conf/dns_test.go

@@ -2,6 +2,8 @@ package conf_test
 
 import (
 	"encoding/json"
+	"os"
+	"path/filepath"
 	"testing"
 
 	"github.com/google/go-cmp/cmp"
@@ -122,3 +124,51 @@ func TestDNSConfigParsing(t *testing.T) {
 		}
 	}
 }
+
+func TestDNSScriptConfig(t *testing.T) {
+	dir := t.TempDir()
+	t.Setenv("xray.location.confdir", dir)
+	path := filepath.Join(dir, "lookup.lua")
+	if err := os.WriteFile(path, []byte("function HandleDNSQuery(domain, ipv4, ipv6, fake) end"), 0o600); err != nil {
+		t.Fatal(err)
+	}
+
+	for _, tc := range []struct {
+		name      string
+		script    string
+		wantError bool
+	}{
+		{"relative", "lookup.lua", false},
+		{"absolute", path, false},
+		{"missing", "missing.lua", true},
+		{"directory", dir, true},
+	} {
+		t.Run(tc.name, func(t *testing.T) {
+			built, err := (&DNSConfig{Script: tc.script}).Build()
+			if tc.wantError {
+				if err == nil {
+					t.Fatal("Build accepted an invalid script path")
+				}
+				return
+			}
+			if err != nil {
+				t.Fatal(err)
+			}
+			if built.Script != path {
+				t.Fatalf("script path = %q, want %q", built.Script, path)
+			}
+		})
+	}
+
+	var parsed DNSConfig
+	if err := json.Unmarshal([]byte(`{"servers":[{"id":"primary","address":"1.1.1.1"}]}`), &parsed); err != nil {
+		t.Fatal(err)
+	}
+	built, err := parsed.Build()
+	if err != nil {
+		t.Fatal(err)
+	}
+	if len(built.NameServer) != 1 || built.NameServer[0].Id != "primary" {
+		t.Fatalf("nameserver IDs = %v, want primary", built.NameServer)
+	}
+}

infra/conf/masque.go

@@ -0,0 +1,37 @@
+package conf
+
+import (
+	"net/netip"
+
+	"github.com/xtls/xray-core/common/errors"
+	"github.com/xtls/xray-core/common/protocol"
+	"github.com/xtls/xray-core/proxy/masque"
+	"google.golang.org/protobuf/proto"
+)
+
+type MasqueClientConfig struct {
+	Address   *Address `json:"address"`
+	Port      uint16   `json:"port"`
+	RemoteDNS []string `json:"remoteDNS"`
+}
+
+func (c *MasqueClientConfig) Build() (proto.Message, error) {
+	if c.Address == nil {
+		return nil, errors.New(`MASQUE: "address" is not set`)
+	}
+	if c.Port == 0 {
+		return nil, errors.New(`MASQUE: "port" is not set`)
+	}
+	for _, s := range c.RemoteDNS {
+		if _, err := netip.ParseAddr(s); err != nil {
+			return nil, errors.New(`MASQUE: invalid "remoteDNS" `, s).Base(err)
+		}
+	}
+	return &masque.ClientConfig{
+		Server: &protocol.ServerEndpoint{
+			Address: c.Address.Build(),
+			Port:    uint32(c.Port),
+		},
+		RemoteDns: c.RemoteDNS,
+	}, nil
+}

infra/conf/masque_test.go

@@ -0,0 +1,85 @@
+package conf_test
+
+import (
+	"encoding/json"
+	"testing"
+
+	. "github.com/xtls/xray-core/infra/conf"
+	"github.com/xtls/xray-core/transport/internet/masque"
+)
+
+func TestMasqueConfig(t *testing.T) {
+	creator := func() Buildable {
+		return new(MasqueConfig)
+	}
+
+	runMultiTestCase(t, []TestCase{
+		{
+			Input:  `{}`,
+			Parser: loadJSON(creator),
+			Output: &masque.Config{Path: "/.well-known/masque/ip/*/*/"},
+		},
+		{
+			Input: `{
+				"host": "example.com:8443",
+				"path": "/.well-known/masque/ip/{target}/{ipproto}/",
+				"headers": {"Authorization": "Basic dTpw"}
+			}`,
+			Parser: loadJSON(creator),
+			Output: &masque.Config{
+				Host:    "example.com:8443",
+				Path:    "/.well-known/masque/ip/*/*/",
+				Headers: map[string]string{"Authorization": "Basic dTpw"},
+			},
+		},
+		{
+			Input:  `{"path": "/masque/ip{?target,ipproto}"}`,
+			Parser: loadJSON(creator),
+			Output: &masque.Config{Path: "/masque/ip?target=*&ipproto=*"},
+		},
+	})
+
+	for _, input := range []string{
+		`{"path": "/masque/{target}/{ipproto}/{dns}"}`,
+		`{"path": "masque"}`,
+		`{"host": "example.com/path"}`,
+		`{"headers": {"host": "example.com"}}`,
+		`{"headers": {"Capsule-Protocol": "?0"}}`,
+		`{"headers": {"X Token": "a"}}`,
+		`{"headers": {"X-Token": "a\r\nb"}}`,
+	} {
+		if _, err := loadJSON(creator)(input); err == nil {
+			t.Errorf("expected an error for %s", input)
+		}
+	}
+}
+
+func TestMasqueOutboundConfig(t *testing.T) {
+	build := func(s string) error {
+		c := new(OutboundDetourConfig)
+		if err := json.Unmarshal([]byte(s), c); err != nil {
+			return err
+		}
+		_, err := c.Build()
+		return err
+	}
+
+	if err := build(`{
+		"protocol": "masque",
+		"settings": {"address": "example.com", "port": 443},
+		"streamSettings": {"network": "masque", "security": "tls"},
+		"mux": {"enabled": false, "concurrency": -1}
+	}`); err != nil {
+		t.Error(err)
+	}
+	for _, input := range []string{
+		`{"protocol": "masque", "settings": {"address": "example.com"}, "streamSettings": {"network": "masque", "security": "tls"}}`,
+		`{"protocol": "masque", "settings": {"address": "example.com", "port": 443}, "streamSettings": {"network": "masque", "security": "tls"}, "mux": {"enabled": true}}`,
+		`{"protocol": "masque", "settings": {"address": "example.com", "port": 443}, "streamSettings": {"network": "masque", "security": "tls"}, "mux": {"enabled": true, "concurrency": -1}}`,
+		`{"protocol": "freedom", "streamSettings": {"network": "masque", "security": "tls"}}`,
+	} {
+		if err := build(input); err == nil {
+			t.Errorf("expected an error for %s", input)
+		}
+	}
+}

infra/conf/observatory.go

@@ -23,7 +23,7 @@ func (o *ObservatoryConfig) Build() (proto.Message, error) {
 type BurstObservatoryConfig struct {
 	SubjectSelector []string `json:"subjectSelector"`
 	// health check settings
-	HealthCheck *healthCheckSettings `json:"pingConfig,omitempty"`
+	HealthCheck *HealthCheckSettings `json:"pingConfig,omitempty"`
 }
 
 func (b BurstObservatoryConfig) Build() (proto.Message, error) {

infra/conf/router.go

@@ -7,6 +7,7 @@ import (
 	"github.com/xtls/xray-core/app/router"
 	"github.com/xtls/xray-core/common/errors"
 	"github.com/xtls/xray-core/common/geodata"
+	"github.com/xtls/xray-core/common/platform"
 	"github.com/xtls/xray-core/common/serial"
 
 	"google.golang.org/protobuf/proto"
@@ -72,6 +73,7 @@ type RouterConfig struct {
 	RuleList       []json.RawMessage `json:"rules"`
 	DomainStrategy *string           `json:"domainStrategy"`
 	Balancers      []*BalancingRule  `json:"balancers"`
+	Script         string            `json:"script"`
 }
 
 func (c *RouterConfig) getDomainStrategy() router.Config_DomainStrategy {
@@ -92,6 +94,15 @@ func (c *RouterConfig) getDomainStrategy() router.Config_DomainStrategy {
 
 func (c *RouterConfig) Build() (*router.Config, error) {
 	config := new(router.Config)
+
+	if c.Script != "" {
+		path, err := platform.ResolveLuaFile(c.Script)
+		if err != nil {
+			return nil, errors.New("failed to resolve routing script").Base(err)
+		}
+		config.Script = path
+	}
+
 	config.DomainStrategy = c.getDomainStrategy()
 
 	var rawRuleList []json.RawMessage
@@ -148,6 +159,7 @@ func parseFieldRule(msg json.RawMessage) (*router.RoutingRule, error) {
 		LocalIP    *StringList        `json:"localIP"`
 		LocalPort  *PortList          `json:"localPort"`
 		Process    *StringList        `json:"process"`
+		LocalOS    *StringList        `json:"localOS"`
 		Webhook    *WebhookRuleConfig `json:"webhook"`
 	}
 	rawFieldRule := new(RawFieldRule)
@@ -261,6 +273,10 @@ func parseFieldRule(msg json.RawMessage) (*router.RoutingRule, error) {
 		rule.Process = *rawFieldRule.Process
 	}
 
+	if rawFieldRule.LocalOS != nil && len(*rawFieldRule.LocalOS) > 0 {
+		rule.LocalOs = *rawFieldRule.LocalOS
+	}
+
 	if rawFieldRule.Webhook != nil && rawFieldRule.Webhook.URL != "" {
 		rule.Webhook = &router.WebhookConfig{
 			Url:           rawFieldRule.Webhook.URL,

infra/conf/router_strategy.go

@@ -43,8 +43,8 @@ type strategyLeastLoadConfig struct {
 	Tolerance float64 `json:"tolerance,omitempty"`
 }
 
-// healthCheckSettings holds settings for health Checker
-type healthCheckSettings struct {
+// HealthCheckSettings holds settings for health Checker
+type HealthCheckSettings struct {
 	Destination   string            `json:"destination"`
 	Connectivity  string            `json:"connectivity"`
 	Interval      duration.Duration `json:"interval"`
@@ -53,7 +53,7 @@ type healthCheckSettings struct {
 	HttpMethod    string            `json:"httpMethod"`
 }
 
-func (h healthCheckSettings) Build() (proto.Message, error) {
+func (h HealthCheckSettings) Build() (proto.Message, error) {
 	var httpMethod string
 	if h.HttpMethod == "" {
 		httpMethod = "HEAD"

infra/conf/router_test.go

@@ -2,6 +2,8 @@ package conf_test
 
 import (
 	"encoding/json"
+	"os"
+	"path/filepath"
 	"testing"
 	"time"
 	_ "unsafe"
@@ -236,3 +238,39 @@ func TestRouterConfig(t *testing.T) {
 		},
 	})
 }
+
+func TestRouterScriptConfig(t *testing.T) {
+	dir := t.TempDir()
+	t.Setenv("xray.location.confdir", dir)
+	path := filepath.Join(dir, "route.lua")
+	if err := os.WriteFile(path, []byte("function HandleRoute() end"), 0o600); err != nil {
+		t.Fatal(err)
+	}
+
+	for _, tc := range []struct {
+		name      string
+		script    string
+		wantError bool
+	}{
+		{"relative", "route.lua", false},
+		{"absolute", path, false},
+		{"missing", "missing.lua", true},
+		{"directory", dir, true},
+	} {
+		t.Run(tc.name, func(t *testing.T) {
+			built, err := (&RouterConfig{Script: tc.script}).Build()
+			if tc.wantError {
+				if err == nil {
+					t.Fatal("Build accepted invalid script path")
+				}
+				return
+			}
+			if err != nil {
+				t.Fatal(err)
+			}
+			if built.Script != path {
+				t.Fatalf("script path = %q, want %q", built.Script, path)
+			}
+		})
+	}
+}

infra/conf/transport_finalmask.go

@@ -11,6 +11,7 @@ import (
 	"regexp"
 	"strings"
 
+	googleuuid "github.com/google/uuid"
 	"github.com/xtls/xray-core/common/errors"
 	"github.com/xtls/xray-core/common/net"
 	"github.com/xtls/xray-core/transport/internet/finalmask/fragment"
@@ -22,6 +23,7 @@ import (
 	"github.com/xtls/xray-core/transport/internet/finalmask/realm"
 	"github.com/xtls/xray-core/transport/internet/finalmask/salamander"
 	"github.com/xtls/xray-core/transport/internet/finalmask/sudoku"
+	"github.com/xtls/xray-core/transport/internet/finalmask/udphop"
 	"github.com/xtls/xray-core/transport/internet/finalmask/xdns"
 	"github.com/xtls/xray-core/transport/internet/finalmask/xicmp"
 	"github.com/xtls/xray-core/transport/internet/finalmask/xmc"
@@ -82,6 +84,7 @@ var (
 		"xdns":          func() interface{} { return new(Xdns) },
 		"xicmp":         func() interface{} { return new(Xicmp) },
 		"realm":         func() interface{} { return new(Realm) },
+		"udphop":        func() interface{} { return new(UDPHop) },
 	}, "type", "settings")
 )
 
@@ -720,14 +723,46 @@ func (c *Xdns) Build() (proto.Message, error) {
 }
 
 type XMC struct {
-	Hostname  string   `json:"hostname"`
-	Usernames []string `json:"usernames"`
-	Password  string   `json:"password"`
+	Hostname string       `json:"hostname"`
+	Profiles []XMCProfile `json:"profiles"`
+	Password string       `json:"password"`
+}
+
+type XMCProfile struct {
+	// Resolve the UUID by username, then request the session profile with
+	// unsigned=false. Client and server must use the same signed profile.
+	Username          string `json:"username"`
+	UUID              string `json:"uuid"`
+	TexturesValue     string `json:"texturesValue"`
+	TexturesSignature string `json:"texturesSignature"`
+}
+
+var xmcUsernamePattern = regexp.MustCompile(`^[A-Za-z0-9_]{3,16}$`)
+
+func (c *XMCProfile) Build() (*xmc.Profile, error) {
+	if !xmcUsernamePattern.MatchString(c.Username) {
+		return nil, fmt.Errorf("invalid minecraft profile username: %q", c.Username)
+	}
+
+	profileUUID, err := googleuuid.Parse(c.UUID)
+	if err != nil {
+		return nil, fmt.Errorf("invalid minecraft profile UUID: %w", err)
+	}
+	if c.TexturesValue == "" || c.TexturesSignature == "" {
+		return nil, fmt.Errorf("incomplete minecraft profile textures")
+	}
+
+	return &xmc.Profile{
+		Username:          c.Username,
+		Uuid:              append([]byte(nil), profileUUID[:]...),
+		TexturesValue:     c.TexturesValue,
+		TexturesSignature: c.TexturesSignature,
+	}, nil
 }
 
 func (c *XMC) Build() (proto.Message, error) {
-	if len(c.Usernames) == 0 {
-		c.Usernames = []string{"Dream"}
+	if len(c.Profiles) == 0 {
+		return nil, fmt.Errorf("minecraft profiles are required")
 	}
 
 	if c.Password == "" {
@@ -744,12 +779,21 @@ func (c *XMC) Build() (proto.Message, error) {
 		return nil, fmt.Errorf("marshal minecraft rsa public key: %w", err)
 	}
 
+	profiles := make([]*xmc.Profile, 0, len(c.Profiles))
+	for i := range c.Profiles {
+		profile, err := c.Profiles[i].Build()
+		if err != nil {
+			return nil, fmt.Errorf("build minecraft profile %d: %w", i, err)
+		}
+		profiles = append(profiles, profile)
+	}
+
 	return &xmc.Config{
 		Password:      c.Password,
-		Usernames:     c.Usernames,
 		Hostname:      c.Hostname,
 		RsaPrivateKey: x509.MarshalPKCS1PrivateKey(rsaPrivateKey),
 		RsaPublicKey:  rsaPublicKey,
+		Profiles:      profiles,
 	}, nil
 }
 
@@ -774,9 +818,11 @@ func (c *Xicmp) Build() (proto.Message, error) {
 }
 
 type Realm struct {
-	Url         string     `json:"url"`
-	StunServers []string   `json:"stunServers"`
-	TlsConfig   *TLSConfig `json:"tlsConfig"`
+	Url         string             `json:"url"`
+	StunServers []string           `json:"stunServers"`
+	TlsConfig   *TLSConfig         `json:"tlsConfig"`
+	IPMode      string             `json:"ipMode"`
+	PortMapping *realm.PortMapping `json:"portMapping"`
 }
 
 func (c *Realm) Build() (proto.Message, error) {
@@ -856,6 +902,54 @@ func (c *Realm) Build() (proto.Message, error) {
 		ID:          id,
 		StunServers: stunServers,
 		TlsConfig:   tlsConfig,
+		IPMode:      strings.ToLower(c.IPMode),
+		PortMapping: c.PortMapping,
+	}, nil
+}
+
+type UDPHop struct {
+	Mode        string     `json:"mode"`
+	Interval    Int32Range `json:"interval"`
+	RemoteIPs   []string   `json:"remoteIPs"`
+	RemotePorts PortList   `json:"remotePorts"`
+}
+
+func (c *UDPHop) Build() (proto.Message, error) {
+	var local, remote, remoteOnce bool
+	for _, mode := range strings.Split(c.Mode, ",") {
+		switch strings.ToLower(mode) {
+		case "intervallocal":
+			local = true
+		case "intervalremote":
+			remote = true
+		case "perconnremote":
+			remoteOnce = true
+		default:
+			return nil, errors.New("invalid mode ", mode)
+		}
+	}
+	var remoteIPs []string
+	for _, ip := range c.RemoteIPs {
+		prefix, err := netip.ParsePrefix(ip)
+		if err == nil {
+			remoteIPs = append(remoteIPs, prefix.String())
+			continue
+		}
+		addr, err := netip.ParseAddr(ip)
+		if err == nil {
+			remoteIPs = append(remoteIPs, netip.PrefixFrom(addr, addr.BitLen()).String())
+			continue
+		}
+		return nil, errors.New("invalid ip ", ip)
+	}
+	return &udphop.Config{
+		Local:       local,
+		Remote:      remote,
+		RemoteOnce:  remoteOnce,
+		IntervalMin: int64(c.Interval.From),
+		IntervalMax: int64(c.Interval.To),
+		RemoteIPs:   remoteIPs,
+		RemotePorts: c.RemotePorts.Build().Ports(),
 	}, nil
 }
 
@@ -886,20 +980,23 @@ func (c *Mask) Build(tcp bool) (proto.Message, error) {
 }
 
 type QuicParamsConfig struct {
-	Congestion                  string    `json:"congestion"`
-	Debug                       bool      `json:"debug"`
-	BbrProfile                  string    `json:"bbrProfile"`
-	BrutalUp                    Bandwidth `json:"brutalUp"`
-	BrutalDown                  Bandwidth `json:"brutalDown"`
-	UdpHop                      UdpHop    `json:"udpHop"`
-	InitStreamReceiveWindow     uint64    `json:"initStreamReceiveWindow"`
-	MaxStreamReceiveWindow      uint64    `json:"maxStreamReceiveWindow"`
-	InitConnectionReceiveWindow uint64    `json:"initConnectionReceiveWindow"`
-	MaxConnectionReceiveWindow  uint64    `json:"maxConnectionReceiveWindow"`
-	MaxIdleTimeout              int64     `json:"maxIdleTimeout"`
-	KeepAlivePeriod             int64     `json:"keepAlivePeriod"`
-	DisablePathMTUDiscovery     bool      `json:"disablePathMTUDiscovery"`
-	MaxIncomingStreams          int64     `json:"maxIncomingStreams"`
+	Congestion                    string    `json:"congestion"`
+	Debug                         bool      `json:"debug"`
+	BbrProfile                    string    `json:"bbrProfile"`
+	BrutalUp                      Bandwidth `json:"brutalUp"`
+	BrutalDown                    Bandwidth `json:"brutalDown"`
+	BrutalDisableLossCompensation bool      `json:"brutalDisableLossCompensation"`
+	InitStreamReceiveWindow       uint64    `json:"initStreamReceiveWindow"`
+	MaxStreamReceiveWindow        uint64    `json:"maxStreamReceiveWindow"`
+	InitConnectionReceiveWindow   uint64    `json:"initConnectionReceiveWindow"`
+	MaxConnectionReceiveWindow    uint64    `json:"maxConnectionReceiveWindow"`
+	MaxIdleTimeout                int64     `json:"maxIdleTimeout"`
+	KeepAlivePeriod               int64     `json:"keepAlivePeriod"`
+	DisablePathMTUDiscovery       bool      `json:"disablePathMTUDiscovery"`
+	DisableChromeParrot           bool      `json:"disableChromeParrot"`
+	DisableGSO                    bool      `json:"disableGSO"`
+	MaxIncomingStreams            int64     `json:"maxIncomingStreams"`
+	DisableStatelessReset         bool      `json:"disableStatelessReset"`
 }
 
 type FinalMask struct {

infra/conf/transport_finalmask_xmc_test.go

@@ -0,0 +1,36 @@
+package conf
+
+import (
+	"strings"
+	"testing"
+
+	"github.com/xtls/xray-core/transport/internet/finalmask/xmc"
+)
+
+func TestXMCBuildProfile(t *testing.T) {
+	built, err := (&XMC{
+		Password: "test-password",
+		Profiles: []XMCProfile{
+			{
+				Username:          "TestUser",
+				UUID:              "00112233-4455-6677-8899-aabbccddeeff",
+				TexturesValue:     "textures-value",
+				TexturesSignature: "textures-signature",
+			},
+		},
+	}).Build()
+	if err != nil {
+		t.Fatalf("build XMC config: %v", err)
+	}
+	config := built.(*xmc.Config)
+	if len(config.Profiles) != 1 || len(config.Profiles[0].Uuid) != 16 {
+		t.Fatalf("unexpected profiles: %+v", config.Profiles)
+	}
+}
+
+func TestXMCBuildRequiresProfile(t *testing.T) {
+	_, err := (&XMC{Password: "test-password"}).Build()
+	if err == nil || !strings.Contains(err.Error(), "profiles are required") {
+		t.Fatalf("expected required profiles error, got %v", err)
+	}
+}

infra/conf/transport_internet.go

@@ -36,6 +36,10 @@ func (p TransportProtocol) Build() (string, error) {
 		return "", errors.PrintRemovedFeatureError("QUIC transport (without web service, etc.)", "XHTTP stream-one H3")
 	case "hysteria":
 		return "hysteria", nil
+	case "masque":
+		return "masque", nil
+	case "xdrive":
+		return "xdrive", nil
 	default:
 		return "", errors.New("Config: unknown transport protocol: ", p)
 	}
@@ -59,6 +63,8 @@ type StreamConfig struct {
 	WSSettings          *WebSocketConfig   `json:"wsSettings"`
 	HTTPUPGRADESettings *HttpUpgradeConfig `json:"httpupgradeSettings"`
 	HysteriaSettings    *HysteriaConfig    `json:"hysteriaSettings"`
+	MASQUESettings      *MasqueConfig      `json:"masqueSettings"`
+	XDRIVESettings      *XDriveConfig      `json:"xdriveSettings"`
 	SocketSettings      *SocketConfig      `json:"sockopt"`
 }
 
@@ -192,6 +198,26 @@ func (c *StreamConfig) Build() (*internet.StreamConfig, error) {
 			Settings:     serial.ToTypedMessage(hs),
 		})
 	}
+	if c.MASQUESettings != nil {
+		ms, err := c.MASQUESettings.Build()
+		if err != nil {
+			return nil, errors.New("Failed to build MASQUE config.").Base(err)
+		}
+		config.TransportSettings = append(config.TransportSettings, &internet.TransportConfig{
+			ProtocolName: "masque",
+			Settings:     serial.ToTypedMessage(ms),
+		})
+	}
+	if c.XDRIVESettings != nil {
+		xs, err := c.XDRIVESettings.Build()
+		if err != nil {
+			return nil, errors.New("Failed to build XDRIVE config.").Base(err)
+		}
+		config.TransportSettings = append(config.TransportSettings, &internet.TransportConfig{
+			ProtocolName: "xdrive",
+			Settings:     serial.ToTypedMessage(xs),
+		})
+	}
 	if c.SocketSettings != nil {
 		ss, err := c.SocketSettings.Build()
 		if err != nil {
@@ -253,10 +279,6 @@ func (c *StreamConfig) Build() (*internet.StreamConfig, error) {
 				return nil, errors.New("unknown congestion control: ", c.FinalMask.QuicParams.Congestion, ", valid values: reno, bbr, brutal, force-brutal")
 			}
 
-			if (c.FinalMask.QuicParams.UdpHop.Interval.From != 0 && c.FinalMask.QuicParams.UdpHop.Interval.From < 5) || (c.FinalMask.QuicParams.UdpHop.Interval.To != 0 && c.FinalMask.QuicParams.UdpHop.Interval.To < 5) {
-				return nil, errors.New("Interval must be at least 5")
-			}
-
 			if c.FinalMask.QuicParams.InitStreamReceiveWindow > 0 && c.FinalMask.QuicParams.InitStreamReceiveWindow < 16384 {
 				return nil, errors.New("InitStreamReceiveWindow must be at least 16384")
 			}
@@ -285,44 +307,25 @@ func (c *StreamConfig) Build() (*internet.StreamConfig, error) {
 			}
 
 			config.QuicParams = &internet.QuicParams{
-				Congestion: c.FinalMask.QuicParams.Congestion,
-				BbrProfile: profile,
-				BrutalUp:   up,
-				BrutalDown: down,
-				UdpHop: &internet.UdpHop{
-					Ports:       c.FinalMask.QuicParams.UdpHop.PortList.Build().Ports(),
-					IntervalMin: int64(c.FinalMask.QuicParams.UdpHop.Interval.From),
-					IntervalMax: int64(c.FinalMask.QuicParams.UdpHop.Interval.To),
-				},
-				InitStreamReceiveWindow: c.FinalMask.QuicParams.InitStreamReceiveWindow,
-				MaxStreamReceiveWindow:  c.FinalMask.QuicParams.MaxStreamReceiveWindow,
-				InitConnReceiveWindow:   c.FinalMask.QuicParams.InitConnectionReceiveWindow,
-				MaxConnReceiveWindow:    c.FinalMask.QuicParams.MaxConnectionReceiveWindow,
-				MaxIdleTimeout:          c.FinalMask.QuicParams.MaxIdleTimeout,
-				KeepAlivePeriod:         c.FinalMask.QuicParams.KeepAlivePeriod,
-				DisablePathMtuDiscovery: c.FinalMask.QuicParams.DisablePathMTUDiscovery,
-				MaxIncomingStreams:      c.FinalMask.QuicParams.MaxIncomingStreams,
+				Congestion:                    c.FinalMask.QuicParams.Congestion,
+				BbrProfile:                    profile,
+				BrutalUp:                      up,
+				BrutalDown:                    down,
+				BrutalDisableLossCompensation: c.FinalMask.QuicParams.BrutalDisableLossCompensation,
+				InitStreamReceiveWindow:       c.FinalMask.QuicParams.InitStreamReceiveWindow,
+				MaxStreamReceiveWindow:        c.FinalMask.QuicParams.MaxStreamReceiveWindow,
+				InitConnReceiveWindow:         c.FinalMask.QuicParams.InitConnectionReceiveWindow,
+				MaxConnReceiveWindow:          c.FinalMask.QuicParams.MaxConnectionReceiveWindow,
+				MaxIdleTimeout:                c.FinalMask.QuicParams.MaxIdleTimeout,
+				KeepAlivePeriod:               c.FinalMask.QuicParams.KeepAlivePeriod,
+				DisablePathMtuDiscovery:       c.FinalMask.QuicParams.DisablePathMTUDiscovery,
+				DisableChromeParrot:           c.FinalMask.QuicParams.DisableChromeParrot,
+				DisableGSO:                    c.FinalMask.QuicParams.DisableGSO,
+				MaxIncomingStreams:            c.FinalMask.QuicParams.MaxIncomingStreams,
+				DisableStatelessReset:         c.FinalMask.QuicParams.DisableStatelessReset,
 			}
 		}
 	}
 
 	return config, nil
 }
-
-type ProxyConfig struct {
-	Tag string `json:"tag"`
-
-	// TransportLayerProxy: For compatibility.
-	TransportLayerProxy bool `json:"transportLayer"`
-}
-
-// Build implements Buildable.
-func (v *ProxyConfig) Build() (*internet.ProxyConfig, error) {
-	if v.Tag == "" {
-		return nil, errors.New("Proxy tag is not set.")
-	}
-	return &internet.ProxyConfig{
-		Tag:                 v.Tag,
-		TransportLayerProxy: v.TransportLayerProxy,
-	}, nil
-}

infra/conf/transport_method.go

@@ -1,7 +1,6 @@
 package conf
 
 import (
-	"context"
 	"encoding/json"
 	"math/big"
 	"net/url"
@@ -21,9 +20,12 @@ import (
 	"github.com/xtls/xray-core/transport/internet/httpupgrade"
 	"github.com/xtls/xray-core/transport/internet/hysteria"
 	"github.com/xtls/xray-core/transport/internet/kcp"
+	"github.com/xtls/xray-core/transport/internet/masque"
 	"github.com/xtls/xray-core/transport/internet/splithttp"
 	"github.com/xtls/xray-core/transport/internet/tcp"
 	"github.com/xtls/xray-core/transport/internet/websocket"
+	"github.com/xtls/xray-core/transport/internet/xdrive"
+	"golang.org/x/net/http/httpguts"
 	"google.golang.org/protobuf/proto"
 )
 
@@ -450,8 +452,8 @@ func (c *SplitHTTPConfig) Build() (proto.Message, error) {
 		return nil, errors.New("maxConnections cannot be specified together with maxConcurrency")
 	}
 	if c.Xmux == (XmuxConfig{}) {
-		c.Xmux.MaxConnections.From = 6
-		c.Xmux.MaxConnections.To = 6
+		c.Xmux.MaxConnections.From = 3
+		c.Xmux.MaxConnections.To = 3
 		c.Xmux.HMaxRequestTimes.From = 600
 		c.Xmux.HMaxRequestTimes.To = 900
 		c.Xmux.HMaxReusableSecs.From = 1800
@@ -534,10 +536,6 @@ type KCPConfig struct {
 
 // Build implements Buildable.
 func (c *KCPConfig) Build() (proto.Message, error) {
-	if c.HeaderConfig != nil || c.Seed != nil {
-		return nil, errors.PrintRemovedFeatureError("mkcp header & seed", "finalmask/udp header-* & mkcp-original & mkcp-aes128gcm")
-	}
-
 	config := common.Must2(internet.CreateTransportConfig(kcp.ProtocolName)).(*kcp.Config)
 
 	if c.Mtu != nil {
@@ -560,16 +558,16 @@ func (c *KCPConfig) Build() (proto.Message, error) {
 	}
 
 	if config.Mtu < 21 {
-		return nil, errors.New("Mtu must be at least 21").AtError()
+		return nil, errors.New("MTU must be at least 21")
 	}
 	if config.Tti < 10 || config.Tti > 1000 {
-		return nil, errors.New("invalid mKCP TTI: ", c.Tti).AtError()
+		return nil, errors.New("TTI must be between 10 and 1000")
 	}
 	if config.CwndMultiplier < 1 {
-		return nil, errors.New("CwndMultiplier must be at least 1").AtError()
+		return nil, errors.New("CwndMultiplier must be at least 1")
 	}
 	if config.GetSendingBufferSize() == 0 {
-		return nil, errors.New("MaxSendingWindow must be >= Mtu").AtError()
+		return nil, errors.New("MaxSendingWindow must be at least ", config.Mtu)
 	}
 
 	return config, nil
@@ -739,11 +737,6 @@ func (b Bandwidth) Bps() (uint64, error) {
 	return uint64(val*float64(mul)) / 8, nil
 }
 
-type UdpHop struct {
-	PortList PortList   `json:"ports"`
-	Interval Int32Range `json:"interval"`
-}
-
 type Masquerade struct {
 	Type string `json:"type"`
 
@@ -751,6 +744,7 @@ type Masquerade struct {
 
 	Url         string `json:"url"`
 	RewriteHost bool   `json:"rewriteHost"`
+	XForwarded  bool   `json:"xForwarded"`
 	Insecure    bool   `json:"insecure"`
 
 	Content    string            `json:"content"`
@@ -759,14 +753,8 @@ type Masquerade struct {
 }
 
 type HysteriaConfig struct {
-	Version int32  `json:"version"`
-	Auth    string `json:"auth"`
-
-	Congestion *string    `json:"congestion"`
-	Up         *Bandwidth `json:"up"`
-	Down       *Bandwidth `json:"down"`
-	UdpHop     *UdpHop    `json:"udphop"`
-
+	Version        int32      `json:"version"`
+	Auth           string     `json:"auth"`
 	UdpIdleTimeout int64      `json:"udpIdleTimeout"`
 	Masquerade     Masquerade `json:"masquerade"`
 }
@@ -776,10 +764,6 @@ func (c *HysteriaConfig) Build() (proto.Message, error) {
 		return nil, errors.New("version != 2")
 	}
 
-	if c.Congestion != nil || c.Up != nil || c.Down != nil || c.UdpHop != nil {
-		errors.LogWarning(context.Background(), "congestion & up & down & udphop move to finalmask/quicParams")
-	}
-
 	if c.UdpIdleTimeout != 0 && (c.UdpIdleTimeout < 2 || c.UdpIdleTimeout > 600) {
 		return nil, errors.New("UdpIdleTimeout must be between 2 and 600")
 	}
@@ -791,6 +775,7 @@ func (c *HysteriaConfig) Build() (proto.Message, error) {
 	config.MasqFile = c.Masquerade.Dir
 	config.MasqUrl = c.Masquerade.Url
 	config.MasqUrlRewriteHost = c.Masquerade.RewriteHost
+	config.MasqUrlXForwarded = c.Masquerade.XForwarded
 	config.MasqUrlInsecure = c.Masquerade.Insecure
 	config.MasqString = c.Masquerade.Content
 	config.MasqStringHeaders = c.Masquerade.Headers
@@ -803,6 +788,46 @@ func (c *HysteriaConfig) Build() (proto.Message, error) {
 	return config, nil
 }
 
+type MasqueConfig struct {
+	Host    string            `json:"host"`
+	Path    string            `json:"path"`
+	Headers map[string]string `json:"headers"`
+}
+
+func (c *MasqueConfig) Build() (proto.Message, error) {
+	path := c.Path
+	if path == "" {
+		path = masque.DefaultPath
+	}
+	path = strings.NewReplacer(
+		"{target}", "*", "{ipproto}", "*",
+		"{?target,ipproto}", "?target=*&ipproto=*", "{?ipproto,target}", "?ipproto=*&target=*",
+		"{&target,ipproto}", "&target=*&ipproto=*", "{&ipproto,target}", "&ipproto=*&target=*",
+	).Replace(path)
+	if !strings.HasPrefix(path, "/") || strings.ContainsAny(path, "{}") {
+		return nil, errors.New(`invalid "path": `, path, `, only the variables {target} and {ipproto} are supported`)
+	}
+	if c.Host != "" {
+		if u, err := url.Parse("https://" + c.Host); err != nil || u.Host != c.Host {
+			return nil, errors.New(`invalid "host": `, c.Host)
+		}
+	}
+	for k, v := range c.Headers {
+		if !httpguts.ValidHeaderFieldName(k) || !httpguts.ValidHeaderFieldValue(v) {
+			return nil, errors.New(`invalid header in "headers": `, strconv.Quote(k))
+		}
+		switch strings.ToLower(k) {
+		case "host", "capsule-protocol":
+			return nil, errors.New(`"headers" can't contain "`, k, `"`)
+		}
+	}
+	return &masque.Config{
+		Host:    c.Host,
+		Path:    path,
+		Headers: c.Headers,
+	}, nil
+}
+
 func readFileOrString(f string, s []string) ([]byte, error) {
 	if len(f) > 0 {
 		return filesystem.ReadCert(f)
@@ -812,3 +837,50 @@ func readFileOrString(f string, s []string) ([]byte, error) {
 	}
 	return nil, errors.New("both file and bytes are empty.")
 }
+
+type XDriveConfig struct {
+	RemoteFolder      string          `json:"remoteFolder"`
+	Service           string          `json:"service"`
+	Secrets           []string        `json:"secrets"`
+	SegmentBytes      uint32          `json:"segmentBytes"`
+	FlushIntervalMs   uint32          `json:"flushIntervalMs"`
+	PollIntervalMs    uint32          `json:"pollIntervalMs"`
+	MaxPollIntervalMs uint32          `json:"maxPollIntervalMs"`
+	SessionTTLSeconds uint32          `json:"sessionTtlSeconds"`
+	Concurrency       uint32          `json:"concurrency"`
+	EagerWindowMs     uint32          `json:"eagerWindowMs"`
+	HoleTimeoutMs     uint32          `json:"holeTimeoutMs"`
+	Template          json.RawMessage `json:"template"`
+}
+
+// Build implements Buildable.
+func (c *XDriveConfig) Build() (proto.Message, error) {
+	switch c.Service {
+	case "local":
+	case "Google Drive":
+		if len(c.Secrets) != 3 {
+			return nil, errors.New("Google Drive needs 3 secrets in order of ClientID, ClientSecret, RefreshToken")
+		}
+	case "template":
+		if len(c.Template) == 0 {
+			return nil, errors.New(`service "template" needs a "template" object`)
+		}
+	default:
+		return nil, errors.New("unsupported service")
+	}
+	config := &xdrive.Config{
+		RemoteFolder:      c.RemoteFolder,
+		Service:           c.Service,
+		Secrets:           c.Secrets,
+		SegmentBytes:      c.SegmentBytes,
+		FlushIntervalMs:   c.FlushIntervalMs,
+		PollIntervalMs:    c.PollIntervalMs,
+		MaxPollIntervalMs: c.MaxPollIntervalMs,
+		SessionTtlSeconds: c.SessionTTLSeconds,
+		Concurrency:       c.Concurrency,
+		EagerWindowMs:     c.EagerWindowMs,
+		HoleTimeoutMs:     c.HoleTimeoutMs,
+		Template:          string(c.Template),
+	}
+	return config, nil
+}

infra/conf/transport_security.go

@@ -113,10 +113,10 @@ func (c *REALITYConfig) Build() (proto.Message, error) {
 					config.MinClientVer[i] = byte(u)
 				}
 			}
-			errors.LogWarning(context.Background(), `REALITY: Changing "minClientVer" will increase the likelihood of your server's IP being blocked by the GFW`)
+			// errors.LogWarning(context.Background(), `REALITY: Changing "minClientVer" will increase the likelihood of your server's IP being blocked by the GFW`)
 		} else {
-			config.MinClientVer = []byte{26, 3, 27} // change it at your own risk: https://github.com/XTLS/Xray-core/commit/af7eb68028732a8ee3c0e5d6ab2b8a657bb2e770
-			errors.LogWarning(context.Background(), `REALITY: The default minimal client version is Xray-core v26.3.27, other clients may be refused to connect`)
+			// config.MinClientVer = []byte{26, 3, 27} // change it at your own risk: https://github.com/XTLS/Xray-core/commit/af7eb68028732a8ee3c0e5d6ab2b8a657bb2e770
+			// errors.LogWarning(context.Background(), `REALITY: The default minimal client version is Xray-core v26.3.27, other clients may be refused to connect`)
 		}
 		if c.MaxClientVer != "" {
 			config.MaxClientVer = make([]byte, 3)

infra/conf/transport_sockopt.go

@@ -10,7 +10,7 @@ import (
 )
 
 type CustomSockoptConfig struct {
-	Syetem  string `json:"system"`
+	System  string `json:"system"`
 	Network string `json:"network"`
 	Level   string `json:"level"`
 	Opt     string `json:"opt"`
@@ -124,7 +124,7 @@ func (c *SocketConfig) Build() (*internet.SocketConfig, error) {
 
 	for _, copt := range c.CustomSockopt {
 		customSockopt := &internet.CustomSockopt{
-			System:  copt.Syetem,
+			System:  copt.System,
 			Network: copt.Network,
 			Level:   copt.Level,
 			Opt:     copt.Opt,

infra/conf/transport_test.go

@@ -291,3 +291,76 @@ func TestHeaderCustomUDPBuildRejectsExprWithoutArgs(t *testing.T) {
 		t.Fatalf("expected transform arg rejection, got %v", err)
 	}
 }
+
+func TestXDriveStreamConfig(t *testing.T) {
+	config := new(StreamConfig)
+	if err := json.Unmarshal([]byte(`{
+		"method": "xdrive",
+		"xdriveSettings": {
+			"remoteFolder": "/tmp/xdrive",
+			"service": "local"
+		}
+	}`), config); err != nil {
+		t.Fatalf("Unmarshal: %v", err)
+	}
+
+	built, err := config.Build()
+	if err != nil {
+		t.Fatalf("Build: %v", err)
+	}
+	if built.ProtocolName != "xdrive" {
+		t.Fatalf("ProtocolName is %q, want %q", built.ProtocolName, "xdrive")
+	}
+	if len(built.TransportSettings) != 1 || built.TransportSettings[0].ProtocolName != "xdrive" {
+		t.Fatalf("TransportSettings is %v, want a single xdrive entry", built.TransportSettings)
+	}
+}
+
+func TestXDriveRejectsUnknownService(t *testing.T) {
+	config := new(XDriveConfig)
+	if err := json.Unmarshal([]byte(`{"remoteFolder": "/tmp/xdrive", "service": "Dropbox"}`), config); err != nil {
+		t.Fatalf("Unmarshal: %v", err)
+	}
+	if _, err := config.Build(); err == nil {
+		t.Fatal("Build accepted an unsupported service")
+	}
+}
+
+func TestXDriveTemplateStreamConfig(t *testing.T) {
+	config := new(StreamConfig)
+	if err := json.Unmarshal([]byte(`{
+		"method": "xdrive",
+		"xdriveSettings": {
+			"remoteFolder": "folder",
+			"service": "template",
+			"secrets": ["user", "pass"],
+			"template": {
+				"flatten": true,
+				"auth": {"type": "basic", "username": "{secret0}", "password": "{secret1}"},
+				"put": {"method": "PUT", "url": "https://dav.example/{folder}/{name}"},
+				"get": {"method": "GET", "url": "https://dav.example/{folder}/{name}"},
+				"delete": {"method": "DELETE", "url": "https://dav.example/{folder}/{name}"},
+				"list": {"method": "PROPFIND", "url": "https://dav.example/{folder}/", "namesRegex": "<d:href>/folder/([^<]+)</d:href>"}
+			}
+		}
+	}`), config); err != nil {
+		t.Fatalf("Unmarshal: %v", err)
+	}
+	built, err := config.Build()
+	if err != nil {
+		t.Fatalf("Build: %v", err)
+	}
+	if built.ProtocolName != "xdrive" {
+		t.Fatalf("ProtocolName is %q, want xdrive", built.ProtocolName)
+	}
+}
+
+func TestXDriveTemplateNeedsTemplate(t *testing.T) {
+	config := new(XDriveConfig)
+	if err := json.Unmarshal([]byte(`{"remoteFolder": "f", "service": "template"}`), config); err != nil {
+		t.Fatalf("Unmarshal: %v", err)
+	}
+	if _, err := config.Build(); err == nil {
+		t.Fatal("Build accepted a template service without a template")
+	}
+}

infra/conf/vless.go

@@ -312,6 +312,9 @@ func (c *VLessOutboundConfig) Build() (proto.Message, error) {
 				if err := json.Unmarshal(rawUser, account); err != nil {
 					return nil, errors.New(`VLESS users: invalid user`).Base(err)
 				}
+				// validateOutboundTransportSecurity needs to see these
+				c.Encryption = account.Encryption
+				c.Address = rec.Address
 				if account.Reverse != nil { // may not be reached: error json unmarshal
 					return nil, errors.New(`VLESS users: please use simplified outbound's config style to use "reverse"`)
 				}

infra/conf/wireguard.go

@@ -59,13 +59,13 @@ func (c *WireGuardPeerConfig) Build() (*wireguard.PeerConfig, error) {
 type WireGuardConfig struct {
 	IsClient bool `json:""`
 
-	NoKernelTun    bool                   `json:"noKernelTun"`
-	SecretKey      string                 `json:"secretKey"`
-	Address        []string               `json:"address"`
-	Peers          []*WireGuardPeerConfig `json:"peers"`
-	MTU            int32                  `json:"mtu"`
-	Reserved       []byte                 `json:"reserved"`
-	DomainStrategy string                 `json:"domainStrategy"`
+	NoKernelTun bool                   `json:"noKernelTun"`
+	SecretKey   string                 `json:"secretKey"`
+	Address     []string               `json:"address"`
+	Peers       []*WireGuardPeerConfig `json:"peers"`
+	MTU         int32                  `json:"mtu"`
+	Reserved    []byte                 `json:"reserved"`
+	DNS         []string               `json:"remoteDNS"`
 }
 
 func (c *WireGuardConfig) Build() (proto.Message, error) {
@@ -124,23 +124,9 @@ func (c *WireGuardConfig) Build() (proto.Message, error) {
 	}
 	config.Reserved = c.Reserved
 
-	switch strings.ToLower(c.DomainStrategy) {
-	case "forceip", "":
-		config.DomainStrategy = wireguard.DeviceConfig_FORCE_IP
-	case "forceipv4":
-		config.DomainStrategy = wireguard.DeviceConfig_FORCE_IP4
-	case "forceipv6":
-		config.DomainStrategy = wireguard.DeviceConfig_FORCE_IP6
-	case "forceipv4v6":
-		config.DomainStrategy = wireguard.DeviceConfig_FORCE_IP46
-	case "forceipv6v4":
-		config.DomainStrategy = wireguard.DeviceConfig_FORCE_IP64
-	default:
-		return nil, errors.New("unsupported domain strategy: ", c.DomainStrategy)
-	}
-
 	config.IsClient = c.IsClient
 	config.NoKernelTun = c.NoKernelTun
+	config.DNS = c.DNS
 
 	return config, nil
 }

infra/conf/xray.go

@@ -15,6 +15,8 @@ import (
 	"github.com/xtls/xray-core/common/net"
 	"github.com/xtls/xray-core/common/serial"
 	core "github.com/xtls/xray-core/core"
+	"github.com/xtls/xray-core/proxy/freedom"
+	"github.com/xtls/xray-core/proxy/masque"
 	"github.com/xtls/xray-core/transport/internet"
 )
 
@@ -47,6 +49,7 @@ var (
 		"vmess":       func() interface{} { return new(VMessOutboundConfig) },
 		"trojan":      func() interface{} { return new(TrojanClientConfig) },
 		"hysteria":    func() interface{} { return new(HysteriaClientConfig) },
+		"masque":      func() interface{} { return new(MasqueClientConfig) },
 		"dns":         func() interface{} { return new(DNSOutboundConfig) },
 		"wireguard":   func() interface{} { return &WireGuardConfig{IsClient: true} },
 	}, "protocol", "settings")
@@ -140,7 +143,7 @@ func (c *InboundDetourConfig) Build() (*core.InboundHandlerConfig, error) {
 	// TUN inbound doesn't need port configuration as it uses network interface instead
 	if strings.ToLower(c.Protocol) == "tun" {
 		// Skip port validation for TUN
-	} else if c.ListenOn == nil {
+	} else if c.ListenOn == nil || len(c.ListenOn.String()) == 0 {
 		// Listen on anyip, must set PortList
 		if c.PortList == nil {
 			return nil, errors.New("Listen on AnyIP but no Port(s) set in InboundDetour.")
@@ -216,21 +219,11 @@ type OutboundDetourConfig struct {
 	Tag            string           `json:"tag"`
 	Settings       *json.RawMessage `json:"settings"`
 	StreamSetting  *StreamConfig    `json:"streamSettings"`
-	ProxySettings  *ProxyConfig     `json:"proxySettings"`
+	ProxySettings  *json.RawMessage `json:"proxySettings"`
 	MuxSettings    *MuxConfig       `json:"mux"`
 	TargetStrategy string           `json:"targetStrategy"`
 }
 
-func (c *OutboundDetourConfig) checkChainProxyConfig() error {
-	if c.StreamSetting == nil || c.ProxySettings == nil || c.StreamSetting.SocketSettings == nil {
-		return nil
-	}
-	if len(c.ProxySettings.Tag) > 0 && len(c.StreamSetting.SocketSettings.DialerProxy) > 0 {
-		return errors.New("proxySettings.tag is conflicted with sockopt.dialerProxy").AtWarning()
-	}
-	return nil
-}
-
 func requiresTransportSecurity(address *Address) bool {
 	if address == nil || address.Address == nil {
 		return false
@@ -257,7 +250,7 @@ func validateOutboundTransportSecurity(rawConfig interface{}, senderSettings *pr
 	}
 
 	if tjCfg, ok := rawConfig.(*TrojanClientConfig); ok {
-		if requiresTransportSecurity(tjCfg.Address) {
+		if requiresTransportSecurity(tjCfg.Servers[0].Address) {
 			return errors.New("trojan without TLS is prohibited unless the server address is a private IP or domain")
 		}
 	}
@@ -267,6 +260,10 @@ func validateOutboundTransportSecurity(rawConfig interface{}, senderSettings *pr
 
 // Build implements Buildable.
 func (c *OutboundDetourConfig) Build() (*core.OutboundHandlerConfig, error) {
+	if c.ProxySettings != nil {
+		return nil, errors.PrintRemovedFeatureError(`outbound "proxySettings"`, `"streamSettings.sockopt.dialerProxy"`)
+	}
+
 	senderSettings := &proxyman.SenderConfig{}
 	switch strings.ToLower(c.TargetStrategy) {
 	case "asis", "":
@@ -294,9 +291,6 @@ func (c *OutboundDetourConfig) Build() (*core.OutboundHandlerConfig, error) {
 	default:
 		return nil, errors.New("unsupported target domain strategy: ", c.TargetStrategy)
 	}
-	if err := c.checkChainProxyConfig(); err != nil {
-		return nil, err
-	}
 
 	if c.SendThrough != nil {
 		address := ParseSendThough(c.SendThrough)
@@ -322,26 +316,6 @@ func (c *OutboundDetourConfig) Build() (*core.OutboundHandlerConfig, error) {
 		senderSettings.StreamSettings = ss
 	}
 
-	if c.ProxySettings != nil {
-		ps, err := c.ProxySettings.Build()
-		if err != nil {
-			return nil, errors.New("invalid outbound detour proxy settings").Base(err)
-		}
-		if ps.TransportLayerProxy {
-			if senderSettings.StreamSettings != nil {
-				if senderSettings.StreamSettings.SocketSettings != nil {
-					senderSettings.StreamSettings.SocketSettings.DialerProxy = ps.Tag
-				} else {
-					senderSettings.StreamSettings.SocketSettings = &internet.SocketConfig{DialerProxy: ps.Tag}
-				}
-			} else {
-				senderSettings.StreamSettings = &internet.StreamConfig{SocketSettings: &internet.SocketConfig{DialerProxy: ps.Tag}}
-			}
-			ps = nil
-		}
-		senderSettings.ProxySettings = ps
-	}
-
 	if c.MuxSettings != nil {
 		ms, err := c.MuxSettings.Build()
 		if err != nil {
@@ -358,13 +332,46 @@ func (c *OutboundDetourConfig) Build() (*core.OutboundHandlerConfig, error) {
 	if err != nil {
 		return nil, errors.New("failed to load outbound detour config for protocol ", c.Protocol).Base(err)
 	}
-	if err := validateOutboundTransportSecurity(rawConfig, senderSettings); err != nil {
-		return nil, err
-	}
 	ts, err := rawConfig.(Buildable).Build()
 	if err != nil {
 		return nil, errors.New("failed to build outbound handler for protocol ", c.Protocol).Base(err)
 	}
+	if err := validateOutboundTransportSecurity(rawConfig, senderSettings); err != nil {
+		return nil, err
+	}
+
+	if _, ok := ts.(*masque.ClientConfig); ok {
+		if ms := senderSettings.MultiplexSettings; ms != nil && ms.Enabled {
+			return nil, errors.New(`masque outbound does not support "mux"`)
+		}
+	} else if senderSettings.StreamSettings != nil && senderSettings.StreamSettings.ProtocolName == "masque" {
+		return nil, errors.New("the masque transport can only be used by the masque outbound")
+	}
+
+	if fc, ok := ts.(*freedom.Config); ok {
+		if senderSettings.StreamSettings != nil &&
+			senderSettings.StreamSettings.SocketSettings != nil &&
+			senderSettings.StreamSettings.SocketSettings.AddressPortStrategy != internet.AddressPortStrategy_None {
+			return nil, errors.New(`freedom outbound does not support "sockopt.addressPortStrategy"`)
+		}
+
+		var strategy internet.DomainStrategy
+		if strategy = senderSettings.TargetStrategy; strategy != internet.DomainStrategy_AS_IS {
+			errors.LogWarning(context.Background(), `The "outbound.targetStrategy" setting is not supported directly by freedom and has been automatically migrated to "sockopt.domainStrategy" with no behavior change.`)
+			senderSettings.TargetStrategy = internet.DomainStrategy_AS_IS
+		} else if strategy = fc.DomainStrategy; strategy != internet.DomainStrategy_AS_IS {
+			errors.LogWarning(context.Background(), `The "freedom.domainStrategy" setting is deprecated and will be removed. For compatibility, its value has been automatically migrated to "sockopt.domainStrategy". Please update your config before removal.`)
+		}
+		if strategy != internet.DomainStrategy_AS_IS {
+			if senderSettings.StreamSettings == nil {
+				senderSettings.StreamSettings = &internet.StreamConfig{}
+			}
+			if senderSettings.StreamSettings.SocketSettings == nil {
+				senderSettings.StreamSettings.SocketSettings = &internet.SocketConfig{}
+			}
+			senderSettings.StreamSettings.SocketSettings.DomainStrategy = strategy
+		}
+	}
 
 	return &core.OutboundHandlerConfig{
 		SenderSettings: serial.ToTypedMessage(senderSettings),

infra/vformat/main.go

@@ -1,15 +1,18 @@
 package main
 
 import (
-	"errors"
+	"bytes"
 	"flag"
 	"fmt"
-	"go/build"
 	"os"
-	"os/exec"
 	"path/filepath"
 	"runtime"
+	"sort"
 	"strings"
+	"sync"
+	"sync/atomic"
+
+	"mvdan.cc/gofumpt/format"
 )
 
 var (
@@ -23,101 +26,27 @@ var (
 	isFormat bool
 )
 
-// envFile returns the name of the Go environment configuration file.
-// Copy from https://github.com/golang/go/blob/c4f2a9788a7be04daf931ac54382fbe2cb754938/src/cmd/go/internal/cfg/cfg.go#L150-L166
-func envFile() (string, error) {
-	if file := os.Getenv("GOENV"); file != "" {
-		if file == "off" {
-			return "", errors.New("GOENV=off")
-		}
-		return file, nil
-	}
-	dir, err := os.UserConfigDir()
+func getModuleInfo(pwd string) (modPath, langVersion string, err error) {
+	data, err := os.ReadFile(filepath.Join(pwd, "go.mod"))
 	if err != nil {
-		return "", err
+		return "", "", err
 	}
-	if dir == "" {
-		return "", errors.New("missing user-config dir")
-	}
-	return filepath.Join(dir, "go", "env"), nil
-}
-
-// GetRuntimeEnv returns the value of runtime environment variable,
-// that is set by running following command: `go env -w key=value`.
-func GetRuntimeEnv(key string) (string, error) {
-	file, err := envFile()
-	if err != nil {
-		return "", err
-	}
-	if file == "" {
-		return "", errors.New("missing runtime env file")
-	}
-	var data []byte
-	var runtimeEnv string
-	data, readErr := os.ReadFile(file)
-	if readErr != nil {
-		return "", readErr
-	}
-	envStrings := strings.Split(string(data), "\n")
-	for _, envItem := range envStrings {
-		envItem = strings.TrimSuffix(envItem, "\r")
-		envKeyValue := strings.Split(envItem, "=")
-		if len(envKeyValue) == 2 && strings.TrimSpace(envKeyValue[0]) == key {
-			runtimeEnv = strings.TrimSpace(envKeyValue[1])
-		}
-	}
-	return runtimeEnv, nil
-}
-
-// GetGOBIN returns GOBIN environment variable as a string. It will NOT be empty.
-func GetGOBIN() string {
-	// The one set by user explicitly by `export GOBIN=/path` or `env GOBIN=/path command`
-	GOBIN := os.Getenv("GOBIN")
-	if GOBIN == "" {
-		var err error
-		// The one set by user by running `go env -w GOBIN=/path`
-		GOBIN, err = GetRuntimeEnv("GOBIN")
-		if err != nil {
-			// The default one that Golang uses
-			return filepath.Join(build.Default.GOPATH, "bin")
-		}
-		if GOBIN == "" {
-			return filepath.Join(build.Default.GOPATH, "bin")
-		}
-		return GOBIN
-	}
-	return GOBIN
-}
-
-func Run(binary string, args []string) ([]byte, error) {
-	cmd := exec.Command(binary, args...)
-	cmd.Env = append(cmd.Env, os.Environ()...)
-	output, cmdErr := cmd.CombinedOutput()
-	if cmdErr != nil {
-		return nil, cmdErr
-	}
-	return output, nil
-}
-
-func RunMany(binary string, args, files []string) bool {
-	fmt.Println("Processing with", binary, args, "...")
-
-	formatRequired := false
-	maxTasks := make(chan struct{}, runtime.NumCPU())
-	for _, file := range files {
-		maxTasks <- struct{}{}
-		go func(file string) {
-			output, err := Run(binary, append(args, file))
-			if err != nil {
-				fmt.Println(err)
-			} else if len(output) > 0 {
-				fmt.Println(string(output))
-				formatRequired = true
+	for _, line := range strings.Split(string(data), "\n") {
+		fields := strings.Fields(line)
+		if len(fields) >= 2 {
+			switch fields[0] {
+			case "module":
+				modPath = fields[1]
+			case "go":
+				langVersion = "go" + strings.TrimPrefix(fields[1], "go")
 			}
-			<-maxTasks
-		}(file)
+		}
 	}
-	return formatRequired
+	return modPath, langVersion, nil
+}
+
+func formatGoSource(src []byte, opts format.Options) ([]byte, error) {
+	return format.Source(src, opts)
 }
 
 func main() {
@@ -150,26 +79,76 @@ func main() {
 	}
 
 	pwd := *directory
-	GOBIN := GetGOBIN()
-	binPath := os.Getenv("PATH")
-	pathSlice := []string{pwd, GOBIN, binPath}
-	binPath = strings.Join(pathSlice, string(os.PathListSeparator))
-	os.Setenv("PATH", binPath)
-
-	suffix := ""
-	if runtime.GOOS == "windows" {
-		suffix = ".exe"
-	}
-	gofmt := "gofumpt" + suffix
-
-	if gofmtPath, err := exec.LookPath(gofmt); err != nil {
-		fmt.Println("Can not find", gofmt, "in system path or current working directory.")
+	modPath, langVersion, modErr := getModuleInfo(pwd)
+	if modErr != nil {
+		fmt.Println("Error reading go.mod:", modErr)
 		os.Exit(1)
-	} else {
-		gofmt = gofmtPath
+	}
+	opts := format.Options{
+		LangVersion: langVersion,
+		ModulePath:  modPath,
+	}
+
+	if isFormat {
+		fmt.Println("Formatting Go source files...")
+	} else if isCheck {
+		fmt.Println("Checking files thar are not properly formatted...")
+	}
+
+	jobs := make(chan string, runtime.NumCPU())
+	var wg sync.WaitGroup
+	var formatRequired atomic.Bool
+	var hasErrors atomic.Bool
+
+	for i := 0; i < runtime.NumCPU(); i++ {
+		wg.Go(func() {
+			for path := range jobs {
+				src, err := os.ReadFile(path)
+				if err != nil {
+					fmt.Fprintf(os.Stderr, "Error reading %s: %v\n", path, err)
+					hasErrors.Store(true)
+					continue
+				}
+
+				formatted, err := formatGoSource(src, opts)
+				if err != nil {
+					fmt.Fprintf(os.Stderr, "Error formatting %s: %v\n", path, err)
+					hasErrors.Store(true)
+					continue
+				}
+
+				if !bytes.Equal(src, formatted) {
+					var diffText []byte
+					if isDryrun {
+						newName := filepath.ToSlash(path)
+						oldName := newName + ".orig"
+						diffText = diff(oldName, src, newName, formatted)
+					}
+					if isFormat {
+						info, statErr := os.Stat(path)
+						if statErr != nil {
+							fmt.Fprintf(os.Stderr, "Error stating %s: %v\n", path, statErr)
+							hasErrors.Store(true)
+							continue
+						}
+						if writeErr := os.WriteFile(path, formatted, info.Mode().Perm()); writeErr != nil {
+							fmt.Fprintf(os.Stderr, "Error writing %s: %v\n", path, writeErr)
+							hasErrors.Store(true)
+							continue
+						}
+					}
+
+					formatRequired.Store(true)
+					if isDryrun && len(diffText) > 0 {
+						fmt.Printf("%s\n%s", path, diffText)
+					} else {
+						fmt.Println(path)
+					}
+				}
+			}
+		})
 	}
 
-	rawFilesSlice := make([]string, 0, 1000)
 	walkErr := filepath.Walk(pwd, func(path string, info os.FileInfo, err error) error {
 		if err != nil {
 			fmt.Println(err)
@@ -186,51 +165,206 @@ func main() {
 			!strings.HasSuffix(filename, ".pb.go") &&
 			!strings.Contains(dir, filepath.Join("testing", "mocks")) &&
 			!strings.Contains(path, filepath.Join("main", "distro", "all", "all.go")) {
-			rawFilesSlice = append(rawFilesSlice, path)
+			jobs <- path
 		}
 
 		return nil
 	})
+	close(jobs)
+	wg.Wait()
+
 	if walkErr != nil {
 		fmt.Println(walkErr)
 		os.Exit(1)
 	}
 
-	if isFormat {
-		gofmtArgs := []string{
-			"-l", "-e", "-w",
-		}
+	if hasErrors.Load() {
+		os.Exit(1)
+	}
 
-		fmt.Println("Formatting Go source files...")
-		RunMany(gofmt, gofmtArgs, rawFilesSlice)
-		fmt.Println("Do NOT forget to commit file changes.")
+	if isFormat {
+		if formatRequired.Load() {
+			fmt.Println("Do NOT forget to commit file changes.")
+		}
 	}
 
 	if isCheck {
-		gofmtListArgs := []string{
-			"-l", "-e",
-		}
-
-		fmt.Println("Checking files thar are not properly formatted...")
-		formatRequired := RunMany(gofmt, gofmtListArgs, rawFilesSlice)
-		if formatRequired {
+		if formatRequired.Load() {
 			fmt.Println("Format problem(s) found.")
-		}
-
-		if isDryrun {
-			if formatRequired {
-				gofmtShowArgs := []string{
-					"-d", "-e",
-				}
-				RunMany(gofmt, gofmtShowArgs, rawFilesSlice)
-			}
-		}
-
-		if formatRequired {
-			fmt.Println("Please run 'go install -v mvdan.cc/gofumpt@latest', then run 'go run ./infra/vformat/main.go' to format the Go source files.")
+			fmt.Println("Please run 'go run ./infra/vformat/main.go' to format the Go source files.")
 			os.Exit(1)
 		} else {
 			fmt.Println("All Go source file format check has been passed.")
 		}
 	}
 }
+
+// diff algorithm copied from mvdan.cc/gofumpt/internal/govendor/diff
+type pair struct{ x, y int }
+
+func diff(oldName string, old []byte, newName string, new []byte) []byte {
+	if bytes.Equal(old, new) {
+		return nil
+	}
+	x := diffLines(old)
+	y := diffLines(new)
+
+	var out bytes.Buffer
+	fmt.Fprintf(&out, "diff %s %s\n", oldName, newName)
+	fmt.Fprintf(&out, "--- %s\n", oldName)
+	fmt.Fprintf(&out, "+++ %s\n", newName)
+
+	var (
+		done  pair
+		chunk pair
+		count pair
+		ctext []string
+	)
+	for _, m := range diffTgs(x, y) {
+		if m.x < done.x {
+			continue
+		}
+		start := m
+		for start.x > done.x && start.y > done.y && x[start.x-1] == y[start.y-1] {
+			start.x--
+			start.y--
+		}
+		end := m
+		for end.x < len(x) && end.y < len(y) && x[end.x] == y[end.y] {
+			end.x++
+			end.y++
+		}
+
+		for _, s := range x[done.x:start.x] {
+			ctext = append(ctext, "-"+s)
+			count.x++
+		}
+		for _, s := range y[done.y:start.y] {
+			ctext = append(ctext, "+"+s)
+			count.y++
+		}
+
+		const C = 3
+		if (end.x < len(x) || end.y < len(y)) &&
+			(end.x-start.x < C || (len(ctext) > 0 && end.x-start.x < 2*C)) {
+			for _, s := range x[start.x:end.x] {
+				ctext = append(ctext, " "+s)
+				count.x++
+				count.y++
+			}
+			done = end
+			continue
+		}
+
+		if len(ctext) > 0 {
+			n := end.x - start.x
+			if n > C {
+				n = C
+			}
+			for _, s := range x[start.x : start.x+n] {
+				ctext = append(ctext, " "+s)
+				count.x++
+				count.y++
+			}
+			done = pair{start.x + n, start.y + n}
+
+			if count.x > 0 {
+				chunk.x++
+			}
+			if count.y > 0 {
+				chunk.y++
+			}
+			fmt.Fprintf(&out, "@@ -%d,%d +%d,%d @@\n", chunk.x, count.x, chunk.y, count.y)
+			for _, s := range ctext {
+				out.WriteString(s)
+			}
+			count.x = 0
+			count.y = 0
+			ctext = ctext[:0]
+		}
+
+		if end.x >= len(x) && end.y >= len(y) {
+			break
+		}
+
+		chunk = pair{end.x - C, end.y - C}
+		for _, s := range x[chunk.x:end.x] {
+			ctext = append(ctext, " "+s)
+			count.x++
+			count.y++
+		}
+		done = end
+	}
+
+	return out.Bytes()
+}
+
+func diffLines(x []byte) []string {
+	l := strings.SplitAfter(string(x), "\n")
+	if l[len(l)-1] == "" {
+		l = l[:len(l)-1]
+	} else {
+		l[len(l)-1] += "\n\\ No newline at end of file\n"
+	}
+	return l
+}
+
+func diffTgs(x, y []string) []pair {
+	m := make(map[string]int)
+	for _, s := range x {
+		if c := m[s]; c > -2 {
+			m[s] = c - 1
+		}
+	}
+	for _, s := range y {
+		if c := m[s]; c > -8 {
+			m[s] = c - 4
+		}
+	}
+
+	var xi, yi, inv []int
+	for i, s := range y {
+		if m[s] == -5 {
+			m[s] = len(yi)
+			yi = append(yi, i)
+		}
+	}
+	for i, s := range x {
+		if j, ok := m[s]; ok && j >= 0 {
+			xi = append(xi, i)
+			inv = append(inv, j)
+		}
+	}
+
+	J := inv
+	n := len(xi)
+	T := make([]int, n)
+	L := make([]int, n)
+	for i := range T {
+		T[i] = n + 1
+	}
+	for i := 0; i < n; i++ {
+		k := sort.Search(n, func(k int) bool {
+			return T[k] >= J[i]
+		})
+		T[k] = J[i]
+		L[i] = k + 1
+	}
+	k := 0
+	for _, v := range L {
+		if k < v {
+			k = v
+		}
+	}
+	seq := make([]pair, 2+k)
+	seq[1+k] = pair{len(x), len(y)}
+	lastj := n
+	for i := n - 1; i >= 0; i-- {
+		if L[i] == k && J[i] < lastj {
+			seq[k] = pair{xi[i], yi[J[i]]}
+			k--
+		}
+	}
+	seq[0] = pair{0, 0}
+	return seq
+}

main/distro/all/all.go

@@ -41,6 +41,7 @@ import (
 	_ "github.com/xtls/xray-core/proxy/freedom"
 	_ "github.com/xtls/xray-core/proxy/http"
 	_ "github.com/xtls/xray-core/proxy/loopback"
+	_ "github.com/xtls/xray-core/proxy/masque"
 	_ "github.com/xtls/xray-core/proxy/shadowsocks"
 	_ "github.com/xtls/xray-core/proxy/socks"
 	_ "github.com/xtls/xray-core/proxy/trojan"
@@ -54,12 +55,14 @@ import (
 	_ "github.com/xtls/xray-core/transport/internet/grpc"
 	_ "github.com/xtls/xray-core/transport/internet/httpupgrade"
 	_ "github.com/xtls/xray-core/transport/internet/kcp"
+	_ "github.com/xtls/xray-core/transport/internet/masque"
 	_ "github.com/xtls/xray-core/transport/internet/reality"
 	_ "github.com/xtls/xray-core/transport/internet/splithttp"
 	_ "github.com/xtls/xray-core/transport/internet/tcp"
 	_ "github.com/xtls/xray-core/transport/internet/tls"
 	_ "github.com/xtls/xray-core/transport/internet/udp"
 	_ "github.com/xtls/xray-core/transport/internet/websocket"
+	_ "github.com/xtls/xray-core/transport/internet/xdrive"
 
 	// Transport headers
 	_ "github.com/xtls/xray-core/transport/internet/headers/http"

proxy/blackhole/blackhole.go

@@ -2,12 +2,15 @@
 package blackhole
 
 import (
+	"bytes"
 	"context"
+	"net/http"
 	"time"
 
 	"github.com/xtls/xray-core/common"
 	"github.com/xtls/xray-core/common/buf"
 	"github.com/xtls/xray-core/common/dice"
+	"github.com/xtls/xray-core/common/errors"
 	"github.com/xtls/xray-core/common/net"
 	"github.com/xtls/xray-core/common/session"
 	"github.com/xtls/xray-core/common/signal"
@@ -17,14 +20,34 @@ import (
 
 // Handler is an outbound connection that silently swallow the entire payload.
 type Handler struct {
-	response ResponseConfig
+	response []byte
+}
+
+var http403response = http.Response{
+	StatusCode: 403,
+	ProtoMajor: 1,
+	ProtoMinor: 1,
+	Header: http.Header{
+		"Connection":    {"close"},
+		"Cache-Control": {"max-age=3600, public"},
+	},
 }
 
 // New creates a new blackhole handler.
 func New(ctx context.Context, config *Config) (*Handler, error) {
-	response, err := config.GetInternalResponse()
-	if err != nil {
-		return nil, err
+	response := []byte{}
+	if config.Response != nil {
+		switch config.Response.Type {
+		case "", "none":
+		case "http":
+			var data bytes.Buffer
+			common.Must(http403response.Write(&data))
+			response = data.Bytes()
+		case "custom":
+			response = config.Response.CustomResponseData
+		default:
+			return nil, errors.New("unknown blackhole response: " + config.Response.Type)
+		}
 	}
 	return &Handler{
 		response: response,
@@ -37,8 +60,10 @@ func (h *Handler) Process(ctx context.Context, link *transport.Link, dialer inte
 	ob := outbounds[len(outbounds)-1]
 	ob.Name = "blackhole"
 
-	nBytes := h.response.WriteTo(link.Writer)
-	if nBytes > 0 {
+	if len(h.response) > 0 {
+		mbc := buf.MultiBufferContainer{}
+		common.Must2(mbc.Write(h.response))
+		link.Writer.WriteMultiBuffer(mbc.MultiBuffer)
 		// Sleep a little here to make sure the response is sent to client.
 		time.Sleep(time.Second)
 	}

proxy/blackhole/blackhole_test.go

@@ -1,12 +1,15 @@
 package blackhole_test
 
 import (
+	"bufio"
+	"bytes"
 	"context"
+	"crypto/rand"
+	"net/http"
 	"testing"
 
 	"github.com/xtls/xray-core/common"
 	"github.com/xtls/xray-core/common/buf"
-	"github.com/xtls/xray-core/common/serial"
 	"github.com/xtls/xray-core/common/session"
 	"github.com/xtls/xray-core/proxy/blackhole"
 	"github.com/xtls/xray-core/transport"
@@ -16,27 +19,58 @@ import (
 func TestBlackholeHTTPResponse(t *testing.T) {
 	ctx := session.ContextWithOutbounds(context.Background(), []*session.Outbound{{}})
 	handler, err := blackhole.New(ctx, &blackhole.Config{
-		Response: serial.ToTypedMessage(&blackhole.HTTPResponse{}),
+		Response: &blackhole.Response{Type: "http"},
 	})
 	common.Must(err)
 
 	reader, writer := pipe.New(pipe.WithoutSizeLimit())
 
-	var mb buf.MultiBuffer
-	var rerr error
+	dataCh := make(chan buf.MultiBuffer, 1)
 	go func() {
-		b, e := reader.ReadMultiBuffer()
-		mb = b
-		rerr = e
+		mb := common.Must2(reader.ReadMultiBuffer())
+		dataCh <- mb
 	}()
-
 	link := transport.Link{
 		Reader: reader,
 		Writer: writer,
 	}
 	common.Must(handler.Process(ctx, &link, nil))
-	common.Must(rerr)
-	if mb.IsEmpty() {
-		t.Error("expect http response, but nothing")
+	mb := <-dataCh
+	data := make([]byte, mb.Len())
+	mb.Copy(data)
+	resp := common.Must2(http.ReadResponse(bufio.NewReader(bytes.NewBuffer(data)), nil))
+	if resp.StatusCode != 403 {
+		t.Errorf("expected 403 response, got %d", resp.StatusCode)
+	}
+}
+
+func TestBlackholeCustomResponse(t *testing.T) {
+	ctx := session.ContextWithOutbounds(context.Background(), []*session.Outbound{{}})
+	// slightly bigger than a buffer
+	expected := make([]byte, buf.Size+1000)
+	if _, err := rand.Read(expected); err != nil {
+		t.Fatal(err)
+	}
+	handler, err := blackhole.New(ctx, &blackhole.Config{
+		Response: &blackhole.Response{
+			Type:               "custom",
+			CustomResponseData: expected,
+		},
+	})
+	common.Must(err)
+
+	reader, writer := pipe.New(pipe.WithoutSizeLimit())
+	var actual buf.MultiBuffer
+	var rerr error
+	go func() {
+		actual, rerr = reader.ReadMultiBuffer()
+	}()
+
+	link := transport.Link{Reader: reader, Writer: writer}
+	common.Must(handler.Process(ctx, &link, nil))
+	common.Must(rerr)
+
+	if actual.String() != string(expected) {
+		t.Errorf("custom response mismatch")
 	}
 }

proxy/blackhole/config.go

@@ -1,47 +0,0 @@
-package blackhole
-
-import (
-	"github.com/xtls/xray-core/common"
-	"github.com/xtls/xray-core/common/buf"
-)
-
-const (
-	http403response = `HTTP/1.1 403 Forbidden
-Connection: close
-Cache-Control: max-age=3600, public
-Content-Length: 0
-
-
-`
-)
-
-// ResponseConfig is the configuration for blackhole responses.
-type ResponseConfig interface {
-	// WriteTo writes a predefined response to the specified buffer.
-	WriteTo(buf.Writer) int32
-}
-
-// WriteTo implements ResponseConfig.WriteTo().
-func (*NoneResponse) WriteTo(buf.Writer) int32 { return 0 }
-
-// WriteTo implements ResponseConfig.WriteTo().
-func (*HTTPResponse) WriteTo(writer buf.Writer) int32 {
-	b := buf.New()
-	common.Must2(b.WriteString(http403response))
-	n := b.Len()
-	writer.WriteMultiBuffer(buf.MultiBuffer{b})
-	return n
-}
-
-// GetInternalResponse converts response settings from proto to internal data structure.
-func (c *Config) GetInternalResponse() (ResponseConfig, error) {
-	if c.GetResponse() == nil {
-		return new(NoneResponse), nil
-	}
-
-	config, err := c.GetResponse().GetInstance()
-	if err != nil {
-		return nil, err
-	}
-	return config.(ResponseConfig), nil
-}

proxy/blackhole/config.pb.go

@@ -7,7 +7,6 @@
 package blackhole
 
 import (
-	serial "github.com/xtls/xray-core/common/serial"
 	protoreflect "google.golang.org/protobuf/reflect/protoreflect"
 	protoimpl "google.golang.org/protobuf/runtime/protoimpl"
 	reflect "reflect"
@@ -22,26 +21,28 @@ const (
 	_ = protoimpl.EnforceVersion(protoimpl.MaxVersion - 20)
 )
 
-type NoneResponse struct {
-	state         protoimpl.MessageState `protogen:"open.v1"`
-	unknownFields protoimpl.UnknownFields
-	sizeCache     protoimpl.SizeCache
+type Response struct {
+	state              protoimpl.MessageState `protogen:"open.v1"`
+	Type               string                 `protobuf:"bytes,1,opt,name=type,proto3" json:"type,omitempty"`
+	CustomResponseData []byte                 `protobuf:"bytes,2,opt,name=custom_response_data,json=customResponseData,proto3" json:"custom_response_data,omitempty"`
+	unknownFields      protoimpl.UnknownFields
+	sizeCache          protoimpl.SizeCache
 }
 
-func (x *NoneResponse) Reset() {
-	*x = NoneResponse{}
+func (x *Response) Reset() {
+	*x = Response{}
 	mi := &file_proxy_blackhole_config_proto_msgTypes[0]
 	ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 	ms.StoreMessageInfo(mi)
 }
 
-func (x *NoneResponse) String() string {
+func (x *Response) String() string {
 	return protoimpl.X.MessageStringOf(x)
 }
 
-func (*NoneResponse) ProtoMessage() {}
+func (*Response) ProtoMessage() {}
 
-func (x *NoneResponse) ProtoReflect() protoreflect.Message {
+func (x *Response) ProtoReflect() protoreflect.Message {
 	mi := &file_proxy_blackhole_config_proto_msgTypes[0]
 	if x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
@@ -53,57 +54,35 @@ func (x *NoneResponse) ProtoReflect() protoreflect.Message {
 	return mi.MessageOf(x)
 }
 
-// Deprecated: Use NoneResponse.ProtoReflect.Descriptor instead.
-func (*NoneResponse) Descriptor() ([]byte, []int) {
+// Deprecated: Use Response.ProtoReflect.Descriptor instead.
+func (*Response) Descriptor() ([]byte, []int) {
 	return file_proxy_blackhole_config_proto_rawDescGZIP(), []int{0}
 }
 
-type HTTPResponse struct {
-	state         protoimpl.MessageState `protogen:"open.v1"`
-	unknownFields protoimpl.UnknownFields
-	sizeCache     protoimpl.SizeCache
-}
-
-func (x *HTTPResponse) Reset() {
-	*x = HTTPResponse{}
-	mi := &file_proxy_blackhole_config_proto_msgTypes[1]
-	ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
-	ms.StoreMessageInfo(mi)
-}
-
-func (x *HTTPResponse) String() string {
-	return protoimpl.X.MessageStringOf(x)
-}
-
-func (*HTTPResponse) ProtoMessage() {}
-
-func (x *HTTPResponse) ProtoReflect() protoreflect.Message {
-	mi := &file_proxy_blackhole_config_proto_msgTypes[1]
+func (x *Response) GetType() string {
 	if x != nil {
-		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
-		if ms.LoadMessageInfo() == nil {
-			ms.StoreMessageInfo(mi)
-		}
-		return ms
+		return x.Type
 	}
-	return mi.MessageOf(x)
+	return ""
 }
 
-// Deprecated: Use HTTPResponse.ProtoReflect.Descriptor instead.
-func (*HTTPResponse) Descriptor() ([]byte, []int) {
-	return file_proxy_blackhole_config_proto_rawDescGZIP(), []int{1}
+func (x *Response) GetCustomResponseData() []byte {
+	if x != nil {
+		return x.CustomResponseData
+	}
+	return nil
 }
 
 type Config struct {
 	state         protoimpl.MessageState `protogen:"open.v1"`
-	Response      *serial.TypedMessage   `protobuf:"bytes,1,opt,name=response,proto3" json:"response,omitempty"`
+	Response      *Response              `protobuf:"bytes,1,opt,name=response,proto3" json:"response,omitempty"`
 	unknownFields protoimpl.UnknownFields
 	sizeCache     protoimpl.SizeCache
 }
 
 func (x *Config) Reset() {
 	*x = Config{}
-	mi := &file_proxy_blackhole_config_proto_msgTypes[2]
+	mi := &file_proxy_blackhole_config_proto_msgTypes[1]
 	ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 	ms.StoreMessageInfo(mi)
 }
@@ -115,7 +94,7 @@ func (x *Config) String() string {
 func (*Config) ProtoMessage() {}
 
 func (x *Config) ProtoReflect() protoreflect.Message {
-	mi := &file_proxy_blackhole_config_proto_msgTypes[2]
+	mi := &file_proxy_blackhole_config_proto_msgTypes[1]
 	if x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -128,10 +107,10 @@ func (x *Config) ProtoReflect() protoreflect.Message {
 
 // Deprecated: Use Config.ProtoReflect.Descriptor instead.
 func (*Config) Descriptor() ([]byte, []int) {
-	return file_proxy_blackhole_config_proto_rawDescGZIP(), []int{2}
+	return file_proxy_blackhole_config_proto_rawDescGZIP(), []int{1}
 }
 
-func (x *Config) GetResponse() *serial.TypedMessage {
+func (x *Config) GetResponse() *Response {
 	if x != nil {
 		return x.Response
 	}
@@ -142,11 +121,12 @@ var File_proxy_blackhole_config_proto protoreflect.FileDescriptor
 
 const file_proxy_blackhole_config_proto_rawDesc = "" +
 	"\n" +
-	"\x1cproxy/blackhole/config.proto\x12\x14xray.proxy.blackhole\x1a!common/serial/typed_message.proto\"\x0e\n" +
-	"\fNoneResponse\"\x0e\n" +
-	"\fHTTPResponse\"F\n" +
-	"\x06Config\x12<\n" +
-	"\bresponse\x18\x01 \x01(\v2 .xray.common.serial.TypedMessageR\bresponseB^\n" +
+	"\x1cproxy/blackhole/config.proto\x12\x14xray.proxy.blackhole\"P\n" +
+	"\bResponse\x12\x12\n" +
+	"\x04type\x18\x01 \x01(\tR\x04type\x120\n" +
+	"\x14custom_response_data\x18\x02 \x01(\fR\x12customResponseData\"D\n" +
+	"\x06Config\x12:\n" +
+	"\bresponse\x18\x01 \x01(\v2\x1e.xray.proxy.blackhole.ResponseR\bresponseB^\n" +
 	"\x18com.xray.proxy.blackholeP\x01Z)github.com/xtls/xray-core/proxy/blackhole\xaa\x02\x14Xray.Proxy.Blackholeb\x06proto3"
 
 var (
@@ -161,15 +141,13 @@ func file_proxy_blackhole_config_proto_rawDescGZIP() []byte {
 	return file_proxy_blackhole_config_proto_rawDescData
 }
 
-var file_proxy_blackhole_config_proto_msgTypes = make([]protoimpl.MessageInfo, 3)
+var file_proxy_blackhole_config_proto_msgTypes = make([]protoimpl.MessageInfo, 2)
 var file_proxy_blackhole_config_proto_goTypes = []any{
-	(*NoneResponse)(nil),        // 0: xray.proxy.blackhole.NoneResponse
-	(*HTTPResponse)(nil),        // 1: xray.proxy.blackhole.HTTPResponse
-	(*Config)(nil),              // 2: xray.proxy.blackhole.Config
-	(*serial.TypedMessage)(nil), // 3: xray.common.serial.TypedMessage
+	(*Response)(nil), // 0: xray.proxy.blackhole.Response
+	(*Config)(nil),   // 1: xray.proxy.blackhole.Config
 }
 var file_proxy_blackhole_config_proto_depIdxs = []int32{
-	3, // 0: xray.proxy.blackhole.Config.response:type_name -> xray.common.serial.TypedMessage
+	0, // 0: xray.proxy.blackhole.Config.response:type_name -> xray.proxy.blackhole.Response
 	1, // [1:1] is the sub-list for method output_type
 	1, // [1:1] is the sub-list for method input_type
 	1, // [1:1] is the sub-list for extension type_name
@@ -188,7 +166,7 @@ func file_proxy_blackhole_config_proto_init() {
 			GoPackagePath: reflect.TypeOf(x{}).PkgPath(),
 			RawDescriptor: unsafe.Slice(unsafe.StringData(file_proxy_blackhole_config_proto_rawDesc), len(file_proxy_blackhole_config_proto_rawDesc)),
 			NumEnums:      0,
-			NumMessages:   3,
+			NumMessages:   2,
 			NumExtensions: 0,
 			NumServices:   0,
 		},

proxy/blackhole/config.proto

@@ -6,12 +6,11 @@ option go_package = "github.com/xtls/xray-core/proxy/blackhole";
 option java_package = "com.xray.proxy.blackhole";
 option java_multiple_files = true;
 
-import "common/serial/typed_message.proto";
-
-message NoneResponse {}
-
-message HTTPResponse {}
+message Response {
+  string type = 1;
+  bytes custom_response_data = 2;
+}
 
 message Config {
-  xray.common.serial.TypedMessage response = 1;
+  Response response = 1;
 }

proxy/blackhole/config_test.go

@@ -1,26 +1,19 @@
 package blackhole_test
 
 import (
-	"bufio"
-	"net/http"
+	"context"
 	"testing"
 
 	"github.com/xtls/xray-core/common"
-	"github.com/xtls/xray-core/common/buf"
-	. "github.com/xtls/xray-core/proxy/blackhole"
+	"github.com/xtls/xray-core/proxy/blackhole"
 )
 
 func TestHTTPResponse(t *testing.T) {
-	buffer := buf.New()
-
-	httpResponse := new(HTTPResponse)
-	httpResponse.WriteTo(buf.NewWriter(buffer))
-
-	reader := bufio.NewReader(buffer)
-	response, err := http.ReadResponse(reader, nil)
+	handler, err := blackhole.New(context.Background(), &blackhole.Config{
+		Response: &blackhole.Response{Type: "http"},
+	})
 	common.Must(err)
-
-	if response.StatusCode != 403 {
-		t.Error("expected status code 403, but got ", response.StatusCode)
+	if handler == nil {
+		t.Error("expected HTTP response handler")
 	}
 }

proxy/dokodemo/fakeudp_openbsd.go

@@ -0,0 +1,78 @@
+//go:build openbsd
+// +build openbsd
+
+package dokodemo
+
+import (
+	"fmt"
+	"net"
+	"os"
+
+	"golang.org/x/sys/unix"
+)
+
+func FakeUDP(addr *net.UDPAddr, mark int) (net.PacketConn, error) {
+	domain := unix.AF_INET6
+	var sockaddr unix.Sockaddr
+	if ip4 := addr.IP.To4(); ip4 != nil {
+		domain = unix.AF_INET
+		sa := &unix.SockaddrInet4{Port: addr.Port}
+		copy(sa.Addr[:], ip4)
+		sockaddr = sa
+	} else if ip6 := addr.IP.To16(); ip6 != nil {
+		sa := &unix.SockaddrInet6{Port: addr.Port}
+		copy(sa.Addr[:], ip6)
+		if addr.Zone != "" {
+			iface, err := net.InterfaceByName(addr.Zone)
+			if err != nil {
+				return nil, &net.OpError{Op: "fake", Err: fmt.Errorf("resolve zone %s: %w", addr.Zone, err)}
+			}
+			sa.ZoneId = uint32(iface.Index)
+		}
+		sockaddr = sa
+	} else {
+		return nil, &net.OpError{Op: "fake", Err: fmt.Errorf("unsupported address %v", addr.IP)}
+	}
+
+	fd, err := unix.Socket(domain, unix.SOCK_DGRAM, 0)
+	if err != nil {
+		return nil, &net.OpError{Op: "fake", Err: fmt.Errorf("socket open: %w", err)}
+	}
+
+	closeFD := true
+	defer func() {
+		if closeFD {
+			unix.Close(fd)
+		}
+	}()
+
+	if err = unix.SetsockoptInt(fd, unix.SOL_SOCKET, unix.SO_BINDANY, 1); err != nil {
+		return nil, &net.OpError{Op: "fake", Err: fmt.Errorf("set socket option SO_BINDANY: %w", err)}
+	}
+	if err = unix.SetsockoptInt(fd, unix.SOL_SOCKET, unix.SO_REUSEADDR, 1); err != nil {
+		return nil, &net.OpError{Op: "fake", Err: fmt.Errorf("set socket option SO_REUSEADDR: %w", err)}
+	}
+	// Several client sessions can be answered from the same original
+	// destination at the same time, so the address has to be shareable.
+	if err = unix.SetsockoptInt(fd, unix.SOL_SOCKET, unix.SO_REUSEPORT, 1); err != nil {
+		return nil, &net.OpError{Op: "fake", Err: fmt.Errorf("set socket option SO_REUSEPORT: %w", err)}
+	}
+
+	if err = unix.Bind(fd, sockaddr); err != nil {
+		return nil, &net.OpError{Op: "fake", Err: fmt.Errorf("bind %s: %w", addr.String(), err)}
+	}
+
+	fdFile := os.NewFile(uintptr(fd), fmt.Sprintf("net-udp-bindany-%s", addr.String()))
+	if fdFile == nil {
+		return nil, &net.OpError{Op: "fake", Err: fmt.Errorf("convert descriptor to file")}
+	}
+	defer fdFile.Close()
+
+	packetConn, err := net.FilePacketConn(fdFile)
+	if err != nil {
+		return nil, &net.OpError{Op: "fake", Err: fmt.Errorf("convert descriptor to packet connection: %w", err)}
+	}
+
+	closeFD = false
+	return packetConn, nil
+}

proxy/dokodemo/fakeudp_other.go

@@ -1,5 +1,5 @@
-//go:build !linux
-// +build !linux
+//go:build !linux && !openbsd
+// +build !linux,!openbsd
 
 package dokodemo
 

proxy/freedom/freedom.go

@@ -53,6 +53,10 @@ func reloadEnvSettings() error {
 func init() {
 	common.Must(common.RegisterConfig((*Config)(nil), func(ctx context.Context, config interface{}) (interface{}, error) {
 		h := new(Handler)
+		if streamSettings, ok := session.StreamSettingsFromContext(ctx).(*internet.MemoryStreamConfig); ok && streamSettings.SocketSettings != nil {
+			h.resolveStrategy = streamSettings.SocketSettings.DomainStrategy
+			h.usesDialerProxy = len(streamSettings.SocketSettings.DialerProxy) > 0
+		}
 		if err := core.RequireFeatures(ctx, func(pm policy.Manager) error {
 			return h.Init(config.(*Config), pm)
 		}); err != nil {
@@ -89,9 +93,11 @@ type FinalRule struct {
 
 // Handler handles Freedom connections.
 type Handler struct {
-	policyManager policy.Manager
-	config        *Config
-	finalRules    []*FinalRule
+	policyManager   policy.Manager
+	config          *Config
+	finalRules      []*FinalRule
+	resolveStrategy internet.DomainStrategy
+	usesDialerProxy bool
 }
 
 func buildFinalRule(config *FinalRuleConfig) (*FinalRule, error) {
@@ -168,22 +174,6 @@ func getDefaultFinalRule(inbound *session.Inbound) *FinalRule {
 	return nil
 }
 
-func (h *Handler) shouldResolveDomainBeforeFinalRules(dialDest net.Destination, defaultRule *FinalRule) bool {
-	if !dialDest.Address.Family().IsDomain() {
-		return false
-	}
-	if len(h.finalRules) > 0 {
-		rule := h.finalRules[0]
-		if rule.action == RuleAction_Allow && rule.network[dialDest.Network] && len(rule.port) == 0 && rule.ip == nil {
-			return false
-		}
-	}
-	if defaultRule != nil || len(h.finalRules) > 0 {
-		return true
-	}
-	return false
-}
-
 func (h *Handler) matchFinalRule(network net.Network, address net.Address, port net.Port, defaultRule *FinalRule) *FinalRule {
 	for _, rule := range h.finalRules {
 		if rule.Apply(network, address, port) {
@@ -196,17 +186,16 @@ func (h *Handler) matchFinalRule(network net.Network, address net.Address, port
 	return nil
 }
 
-func (h *Handler) applyFinalRules(network net.Network, address net.Address, port net.Port, defaultRule *FinalRule) RuleAction {
-	if rule := h.matchFinalRule(network, address, port, defaultRule); rule != nil {
-		return rule.action
-	}
-	return RuleAction_Allow
-}
-
 // Init initializes the Handler with necessary parameters.
 func (h *Handler) Init(config *Config, pm policy.Manager) error {
 	h.config = config
 	h.policyManager = pm
+	if h.usesDialerProxy { // freedom is not the final outbound, final rules do not apply
+		if len(config.FinalRules) > 0 {
+			errors.LogWarning(context.Background(), `The "finalRules" setting is ignored when "sockopt.dialerProxy" is set, since freedom is not the final outbound.`)
+		}
+		return nil
+	}
 	h.finalRules = make([]*FinalRule, 0, len(config.FinalRules))
 	for _, rc := range config.FinalRules {
 		rule, err := buildFinalRule(rc)
@@ -237,6 +226,20 @@ func (h *Handler) blockDelay(rule *FinalRule) time.Duration {
 	return time.Duration(min+uint64(dice.Roll(int(span+1)))) * time.Second
 }
 
+func (h *Handler) blackhole(ctx context.Context, input buf.Reader, output buf.Writer, rule *FinalRule, dest *net.Destination) error {
+	delay := h.blockDelay(rule)
+	errors.LogInfo(ctx, "blocked target: ", *dest, ", blackholing connection for ", delay)
+	timer := time.AfterFunc(delay, func() {
+		common.Interrupt(input)
+		common.Interrupt(output)
+		errors.LogInfo(ctx, "closed blackholed connection to blocked target: ", *dest)
+	})
+	defer timer.Stop()
+	defer common.Close(output)
+	_ = buf.Copy(input, buf.Discard)
+	return nil
+}
+
 func isValidAddress(addr *net.IPOrDomain) bool {
 	if addr == nil {
 		return false
@@ -256,7 +259,10 @@ func (h *Handler) Process(ctx context.Context, link *transport.Link, dialer inte
 	ob.Name = "freedom"
 	ob.CanSpliceCopy = 1
 	inbound := session.InboundFromContext(ctx)
-	defaultRule := getDefaultFinalRule(inbound)
+	var defaultRule *FinalRule
+	if !h.usesDialerProxy { // freedom is not the final outbound, final rules do not apply (and the domain is not resolved)
+		defaultRule = getDefaultFinalRule(inbound)
+	}
 
 	destination := ob.Target
 	origTargetAddr := ob.OriginalTarget.Address
@@ -284,61 +290,53 @@ func (h *Handler) Process(ctx context.Context, link *transport.Link, dialer inte
 	var conn stat.Connection
 	var blockedDest *net.Destination
 	var blockedRule *FinalRule
-	firstResolve := true
 	err := retry.ExponentialBackoff(5, 100).On(func() error {
-		dialDest := destination
-		if h.config.DomainStrategy.HasStrategy() && dialDest.Address.Family().IsDomain() {
-			strategy := h.config.DomainStrategy
-			if destination.Network == net.Network_UDP && origTargetAddr != nil && outGateway == nil {
-				strategy = strategy.GetDynamicStrategy(origTargetAddr.Family())
-			}
-			ips, err := internet.LookupForIP(dialDest.Address.Domain(), strategy, outGateway)
-			if err != nil {
-				errors.LogInfoInner(ctx, err, "failed to get IP address for domain ", dialDest.Address.Domain())
-				if h.config.DomainStrategy.ForceIP() || h.shouldResolveDomainBeforeFinalRules(dialDest, defaultRule) {
-					return err
+		if destination.Address.Family().IsDomain() {
+			if defaultRule != nil || len(h.finalRules) > 0 {
+				if strategy := h.resolveStrategy; strategy.HasStrategy() {
+					ips, err := internet.LookupForIP(destination.Address.Domain(), strategy, outGateway)
+					if err != nil { // non-force may still dial with system DNS
+						errors.LogInfoInner(ctx, err, "failed to get IP address for domain ", destination.Address.Domain())
+						if strategy.ForceIP() {
+							return err // retry
+						}
+					}
+					for _, ip := range ips {
+						if addr := net.IPAddress(ip); addr != nil {
+							if rule := h.matchFinalRule(destination.Network, addr, destination.Port, defaultRule); rule != nil && rule.action == RuleAction_Block {
+								blockedDest = &destination
+								blockedDest.Address = addr
+								blockedRule = rule
+								return nil
+							}
+						}
+					}
+				} else {
+					addrs, err := net.DefaultResolver.LookupIPAddr(ctx, destination.Address.Domain())
+					if err != nil { // dialer may retry DNS
+						errors.LogInfoInner(ctx, err, "failed to get IP address for domain ", destination.Address.Domain())
+					}
+					for _, addr := range addrs {
+						if ipAddr := net.IPAddress(addr.IP); ipAddr != nil {
+							if rule := h.matchFinalRule(destination.Network, ipAddr, destination.Port, defaultRule); rule != nil && rule.action == RuleAction_Block {
+								blockedDest = &destination
+								blockedDest.Address = ipAddr
+								blockedRule = rule
+								return nil
+							}
+						}
+					}
 				}
-			} else {
-				dialDest = net.Destination{
-					Network: dialDest.Network,
-					Address: net.IPAddress(ips[dice.Roll(len(ips))]),
-					Port:    dialDest.Port,
-				}
-				errors.LogInfo(ctx, "dialing to ", dialDest)
 			}
-		} else if h.shouldResolveDomainBeforeFinalRules(dialDest, defaultRule) { // asis + domain + hasrules
-			domain := dialDest.Address.Domain()
-			var ips []net.IP
-			if firstResolve {
-				firstResolve = false
-				supportIPv4, supportIPv6 := utils.CheckRoutes()
-				if supportIPv4 {
-					ips, _ = net.DefaultResolver.LookupIP(ctx, "ip4", domain)
-				}
-				if len(ips) == 0 && supportIPv6 {
-					ips, _ = net.DefaultResolver.LookupIP(ctx, "ip6", domain)
-				}
-				if len(ips) == 0 {
-					return errors.New("failed to get IP address for domain ", domain)
-				}
-			} else {
-				ips, _ = net.DefaultResolver.LookupIP(ctx, "ip", domain)
+		} else {
+			if rule := h.matchFinalRule(destination.Network, destination.Address, destination.Port, defaultRule); rule != nil && rule.action == RuleAction_Block {
+				blockedDest = &destination
+				blockedRule = rule
+				return nil
 			}
-			if len(ips) == 0 { // SRV/TXT, lookup failed
-				return errors.New("failed to get IP address for domain ", domain)
-			}
-			if addr := net.IPAddress(ips[dice.Roll(len(ips))]); addr != nil {
-				dialDest.Address = addr
-				errors.LogInfo(ctx, "dialing to ", dialDest)
-			}
-		}
-		if rule := h.matchFinalRule(dialDest.Network, dialDest.Address, dialDest.Port, defaultRule); rule != nil && rule.action == RuleAction_Block {
-			blockedDest = &dialDest
-			blockedRule = rule
-			return nil
 		}
 
-		rawConn, err := dialer.Dial(ctx, dialDest)
+		rawConn, err := dialer.Dial(ctx, destination)
 		if err != nil {
 			return err
 		}
@@ -350,20 +348,17 @@ func (h *Handler) Process(ctx context.Context, link *transport.Link, dialer inte
 		return errors.New("failed to open connection to ", destination).Base(err)
 	}
 	if blockedDest != nil {
-		delay := h.blockDelay(blockedRule)
-		errors.LogInfo(ctx, "blocked target: ", *blockedDest, ", blackholing connection for ", delay)
-		timer := time.AfterFunc(delay, func() {
-			common.Interrupt(input)
-			common.Interrupt(output)
-			errors.LogInfo(ctx, "closed blackholed connection to blocked target: ", *blockedDest)
-		})
-		defer timer.Stop()
-		defer common.Close(output)
-		if err := buf.Copy(input, buf.Discard); err != nil {
-			return nil
-		}
-		return nil
+		return h.blackhole(ctx, input, output, blockedRule, blockedDest)
 	}
+	if destination.Address.Family().IsDomain() && (defaultRule != nil || len(h.finalRules) > 0) {
+		// pre-check may fail or dialer may select another IP
+		remoteDest := net.DestinationFromAddr(conn.RemoteAddr())
+		if rule := h.matchFinalRule(remoteDest.Network, remoteDest.Address, remoteDest.Port, defaultRule); rule != nil && rule.action == RuleAction_Block {
+			conn.Close()
+			return h.blackhole(ctx, input, output, rule, &remoteDest)
+		}
+	}
+
 	if h.config.ProxyProtocol > 0 && h.config.ProxyProtocol <= 2 {
 		version := byte(h.config.ProxyProtocol)
 		srcAddr := inbound.Source.RawNetAddr()
@@ -408,7 +403,7 @@ func (h *Handler) Process(ctx context.Context, link *transport.Link, dialer inte
 				writer = buf.NewWriter(conn)
 			}
 		} else {
-			writer = NewPacketWriter(conn, h, defaultRule, UDPOverride, destination)
+			writer = NewPacketWriter(conn, h, defaultRule, UDPOverride, destination, outGateway)
 			if h.config.Noises != nil {
 				errors.LogDebug(ctx, "NOISE", h.config.Noises)
 				writer = &NoisePacketWriter{
@@ -512,7 +507,7 @@ func (r *PacketReader) ReadMultiBuffer() (buf.MultiBuffer, error) {
 		}
 		udpAddr := d.(*net.UDPAddr)
 		sourceAddr := net.IPAddress(udpAddr.IP)
-		if r.Handler.applyFinalRules(net.Network_UDP, sourceAddr, net.Port(udpAddr.Port), r.DefaultRule) == RuleAction_Block {
+		if rule := r.Handler.matchFinalRule(net.Network_UDP, sourceAddr, net.Port(udpAddr.Port), r.DefaultRule); rule != nil && rule.action == RuleAction_Block {
 			continue
 		}
 		b.Resize(0, int32(n))
@@ -537,7 +532,7 @@ func (r *PacketReader) ReadMultiBuffer() (buf.MultiBuffer, error) {
 }
 
 // DialDest means the dial target used in the dialer when creating conn
-func NewPacketWriter(conn net.Conn, h *Handler, defaultRule *FinalRule, UDPOverride net.Destination, DialDest net.Destination) buf.Writer {
+func NewPacketWriter(conn net.Conn, h *Handler, defaultRule *FinalRule, UDPOverride net.Destination, DialDest net.Destination, outGateway net.Address) buf.Writer {
 	iConn := conn
 	statConn, ok := iConn.(*stat.CounterConnection)
 	if ok {
@@ -561,9 +556,8 @@ func NewPacketWriter(conn net.Conn, h *Handler, defaultRule *FinalRule, UDPOverr
 			DefaultRule:       defaultRule,
 			UDPOverride:       UDPOverride,
 			ResolvedUDPAddr:   resolvedUDPAddr,
-			LocalAddr:         net.DestinationFromAddr(conn.LocalAddr()).Address,
+			OutGateway:        outGateway,
 		}
-
 	}
 	return &buf.SequentialWriter{Writer: conn}
 }
@@ -580,7 +574,7 @@ type PacketWriter struct {
 	// Resulting in these packets being sent to many different IPs randomly
 	// So, cache and keep the resolve result
 	ResolvedUDPAddr *utils.TypedSyncMap[string, net.Address]
-	LocalAddr       net.Address
+	OutGateway      net.Address
 }
 
 func (w *PacketWriter) WriteMultiBuffer(mb buf.MultiBuffer) error {
@@ -603,21 +597,21 @@ func (w *PacketWriter) WriteMultiBuffer(mb buf.MultiBuffer) error {
 				if ip, ok := w.ResolvedUDPAddr.Load(b.UDP.Address.Domain()); ok {
 					b.UDP.Address = ip
 				} else {
-					ShouldUseSystemResolver := true
-					if w.Handler.config.DomainStrategy.HasStrategy() {
-						ips, err := internet.LookupForIP(b.UDP.Address.Domain(), w.Handler.config.DomainStrategy, w.LocalAddr)
+					shouldUseSystemResolver := true
+					if strategy := w.Handler.resolveStrategy; strategy.HasStrategy() {
+						ips, err := internet.LookupForIP(b.UDP.Address.Domain(), strategy, w.OutGateway)
 						if err != nil {
 							// drop packet if resolve failed when forceIP
-							if w.Handler.config.DomainStrategy.ForceIP() {
+							if strategy.ForceIP() {
 								b.Release()
 								continue
 							}
 						} else {
 							ip = net.IPAddress(ips[dice.Roll(len(ips))])
-							ShouldUseSystemResolver = false
+							shouldUseSystemResolver = false
 						}
 					}
-					if ShouldUseSystemResolver {
+					if shouldUseSystemResolver {
 						udpAddr, err := net.ResolveUDPAddr("udp", b.UDP.NetAddr())
 						if err != nil {
 							b.Release()
@@ -631,7 +625,7 @@ func (w *PacketWriter) WriteMultiBuffer(mb buf.MultiBuffer) error {
 					}
 				}
 			}
-			if w.applyFinalRules(net.Network_UDP, b.UDP.Address, b.UDP.Port, w.DefaultRule) == RuleAction_Block {
+			if rule := w.matchFinalRule(net.Network_UDP, b.UDP.Address, b.UDP.Port, w.DefaultRule); rule != nil && rule.action == RuleAction_Block {
 				b.Release()
 				continue
 			}

proxy/http/client.go

@@ -173,15 +173,18 @@ func fillRequestHeader(ctx context.Context, header []*Header) ([]*Header, error)
 	outbounds := session.OutboundsFromContext(ctx)
 	ob := outbounds[len(outbounds)-1]
 
-	if inbound == nil || ob == nil {
-		return nil, errors.New("missing inbound or outbound metadata from context")
+	var src net.Destination
+	if inbound != nil {
+		src = inbound.Source
+	} else {
+		src = net.TCPDestination(net.AnyIP, 0)
 	}
 
 	data := struct {
 		Source net.Destination
 		Target net.Destination
 	}{
-		Source: inbound.Source,
+		Source: src,
 		Target: ob.Target,
 	}
 

proxy/http/server.go

@@ -332,7 +332,7 @@ func readResponseAndHandle100Continue(r *bufio.Reader, req *http.Request, writer
 					return nil, errors.New("failed to read http 1xx response").Base(err)
 				}
 				ResponseHeader1xx = append(ResponseHeader1xx, data...)
-				if bytes.Equal(ResponseHeader1xx[len(ResponseHeader1xx)-4:], []byte{'\r', '\n', '\r', '\n'}) {
+				if len(ResponseHeader1xx) >= 4 && bytes.Equal(ResponseHeader1xx[len(ResponseHeader1xx)-4:], []byte{'\r', '\n', '\r', '\n'}) {
 					break
 				}
 				if len(ResponseHeader1xx) > 1024 {

proxy/http/server_test.go

@@ -0,0 +1,49 @@
+package http
+
+import (
+	"bufio"
+	"bytes"
+	"io"
+	"net/http"
+	"strings"
+	"testing"
+)
+
+// A malformed upstream response containing a bare '\n' before the real
+// status line used to crash readResponseAndHandle100Continue: the first
+// ReadSlice('\n') returns fewer than 4 bytes, and slicing
+// ResponseHeader1xx[len(ResponseHeader1xx)-4:] panicked with a negative
+// index instead of returning an error.
+func TestReadResponseAndHandle100ContinueDoesNotPanicOnEarlyNewline(t *testing.T) {
+	payload := "X\nHTTP/1.1 100 Continue\r\n\r\n" + strings.Repeat("A", 40)
+	r := bufio.NewReader(bytes.NewReader([]byte(payload)))
+	req, err := http.NewRequest("GET", "http://example.com/", nil)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	// Must not panic; a parse error for the garbage trailing bytes is fine.
+	_, _ = readResponseAndHandle100Continue(r, req, io.Discard)
+}
+
+func TestReadResponseAndHandle100ContinueForwardsAndParsesFinalResponse(t *testing.T) {
+	payload := "HTTP/1.1 100 Continue\r\n\r\n" +
+		"HTTP/1.1 200 OK\r\nContent-Length: 5\r\n\r\nhello"
+	r := bufio.NewReader(bytes.NewReader([]byte(payload)))
+	req, err := http.NewRequest("GET", "http://example.com/", nil)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	var forwarded bytes.Buffer
+	resp, err := readResponseAndHandle100Continue(r, req, &forwarded)
+	if err != nil {
+		t.Fatalf("unexpected error: %v", err)
+	}
+	if resp.StatusCode != 200 {
+		t.Fatalf("expected status 200, got %d", resp.StatusCode)
+	}
+	if !strings.Contains(forwarded.String(), "100 Continue") {
+		t.Fatalf("expected 1xx response to be forwarded, got %q", forwarded.String())
+	}
+}

proxy/hysteria/client.go

@@ -236,14 +236,14 @@ type UDPReader struct {
 
 func (r *UDPReader) ReadFrom(p []byte) (n int, addr *net.Destination, err error) {
 	for {
-		var buf [hysteria.MaxDatagramFrameSize]byte
+		var packet [1500]byte
 
-		n, err := r.reader.Read(buf[:])
+		n, err := r.reader.Read(packet[:])
 		if err != nil {
 			return 0, nil, err
 		}
 
-		msg, err := ParseUDPMessage(buf[:n])
+		msg, err := ParseUDPMessage(packet[:n])
 		if err != nil {
 			continue
 		}

proxy/masque/client.go

@@ -0,0 +1,328 @@
+package masque
+
+import (
+	"context"
+	go_errors "errors"
+	"io"
+	"net/netip"
+	"slices"
+	"sync"
+	"sync/atomic"
+	"time"
+
+	"golang.zx2c4.com/wireguard/tun"
+
+	"github.com/xtls/xray-core/common"
+	"github.com/xtls/xray-core/common/buf"
+	"github.com/xtls/xray-core/common/errors"
+	"github.com/xtls/xray-core/common/net"
+	"github.com/xtls/xray-core/common/protocol"
+	"github.com/xtls/xray-core/common/session"
+	"github.com/xtls/xray-core/common/signal"
+	"github.com/xtls/xray-core/common/task"
+	"github.com/xtls/xray-core/core"
+	"github.com/xtls/xray-core/features/policy"
+	"github.com/xtls/xray-core/proxy/wireguard"
+	"github.com/xtls/xray-core/transport"
+	"github.com/xtls/xray-core/transport/internet"
+	"github.com/xtls/xray-core/transport/internet/masque"
+	"github.com/xtls/xray-core/transport/internet/stat"
+	"github.com/xtls/xray-core/transport/internet/tls"
+)
+
+const (
+	establishTimeout = 10 * time.Second
+	retryInterval    = time.Second
+)
+
+type Client struct {
+	server        *protocol.ServerSpec
+	policyManager policy.Manager
+	remoteDNS     []netip.Addr
+
+	ctx    context.Context
+	cancel context.CancelFunc
+
+	tunnel atomic.Pointer[tunnel]
+
+	mu        sync.Mutex
+	lastErr   error
+	lastErrAt time.Time
+}
+
+func NewClient(ctx context.Context, config *ClientConfig) (*Client, error) {
+	v := core.MustFromContext(ctx)
+	p := v.GetFeature(policy.ManagerType()).(policy.Manager)
+
+	streamSettings := session.StreamSettingsFromContext(ctx).(*internet.MemoryStreamConfig)
+	if _, ok := streamSettings.ProtocolSettings.(*masque.Config); !ok {
+		return nil, errors.New("not masque transport")
+	}
+	if tls.ConfigFromStreamSettings(streamSettings) == nil {
+		return nil, errors.New(`MASQUE requires "security": "tls"`)
+	}
+	if config.Server == nil {
+		return nil, errors.New(`no target server found`)
+	}
+	server, err := protocol.NewServerSpecFromPB(config.Server)
+	if err != nil {
+		return nil, errors.New("failed to get server spec").Base(err)
+	}
+
+	dns := config.RemoteDns
+	if len(dns) == 0 {
+		dns = []string{"1.1.1.1", "1.0.0.1", "2606:4700:4700::1111", "2606:4700:4700::1001"}
+	}
+	remoteDNS := make([]netip.Addr, 0, len(dns))
+	for _, s := range dns {
+		addr, err := netip.ParseAddr(s)
+		if err != nil {
+			return nil, errors.New("invalid remote DNS server ", s).Base(err)
+		}
+		remoteDNS = append(remoteDNS, addr)
+	}
+
+	c := &Client{
+		server:        server,
+		policyManager: p,
+		remoteDNS:     remoteDNS,
+	}
+	c.ctx, c.cancel = context.WithCancel(context.Background())
+	return c, nil
+}
+
+func (c *Client) Process(ctx context.Context, link *transport.Link, dialer internet.Dialer) error {
+	outbounds := session.OutboundsFromContext(ctx)
+	ob := outbounds[len(outbounds)-1]
+	if !ob.Target.IsValid() {
+		return errors.New("target not specified")
+	}
+	ob.Name = "masque"
+	ob.CanSpliceCopy = 3
+
+	t, err := c.getTunnel(ctx, dialer)
+	if err != nil {
+		return errors.New("failed to establish CONNECT-IP tunnel").Base(err)
+	}
+
+	var newCtx context.Context
+	var newCancel context.CancelFunc
+	if session.TimeoutOnlyFromContext(ctx) {
+		newCtx, newCancel = context.WithCancel(context.Background())
+	}
+
+	sessionPolicy := c.policyManager.ForLevel(0)
+	ctx, cancel := context.WithCancel(ctx)
+	timer := signal.CancelAfterInactivity(ctx, func() {
+		cancel()
+		if newCancel != nil {
+			newCancel()
+		}
+	}, sessionPolicy.Timeouts.ConnectionIdle)
+
+	if newCtx != nil {
+		ctx = newCtx
+	}
+
+	var reader buf.Reader
+	var writer buf.Writer
+
+	switch ob.Target.Network {
+	case net.Network_TCP:
+		var conn net.Conn
+		var err error
+		if sessionPolicy.Timeouts.Handshake != 0 {
+			timeoutCtx, timeoutCancel := context.WithTimeout(ctx, sessionPolicy.Timeouts.Handshake)
+			conn, err = t.tnet.DialContext(timeoutCtx, "tcp", ob.Target.NetAddr())
+			timeoutCancel()
+		} else {
+			conn, err = t.tnet.Dial("tcp", ob.Target.NetAddr())
+		}
+		if err != nil {
+			return errors.New("failed to create TCP connection").Base(err)
+		}
+		defer conn.Close()
+		reader = buf.NewReader(conn)
+		writer = buf.NewWriter(conn)
+	case net.Network_UDP:
+		conn, err := t.tnet.Dial("udp", ob.Target.NetAddr())
+		if err != nil {
+			return errors.New("failed to create UDP connection").Base(err)
+		}
+		defer conn.Close()
+		uc := &wireguard.UDPConnClient{
+			PacketConn: conn.(*internet.PacketConnWrapper).PacketConn,
+			Dest:       conn.RemoteAddr().(*net.UDPAddr),
+		}
+		reader = uc
+		writer = uc
+	default:
+		panic(ob.Target.Network)
+	}
+
+	requestFunc := func() error {
+		defer timer.SetTimeout(sessionPolicy.Timeouts.DownlinkOnly)
+		return buf.Copy(link.Reader, writer, buf.UpdateActivity(timer))
+	}
+
+	responseFunc := func() error {
+		defer timer.SetTimeout(sessionPolicy.Timeouts.UplinkOnly)
+		return buf.Copy(reader, link.Writer, buf.UpdateActivity(timer))
+	}
+
+	responseDonePost := task.OnSuccess(responseFunc, task.Close(link.Writer))
+	if err := task.Run(ctx, requestFunc, responseDonePost); err != nil {
+		common.Interrupt(link.Reader)
+		common.Interrupt(link.Writer)
+		return errors.New("connection ends").Base(err)
+	}
+
+	return nil
+}
+
+func (c *Client) getTunnel(ctx context.Context, dialer internet.Dialer) (*tunnel, error) {
+	c.mu.Lock()
+	defer c.mu.Unlock()
+	if c.ctx.Err() != nil {
+		return nil, errors.New("closed")
+	}
+	if t := c.tunnel.Load(); t != nil {
+		select {
+		case <-t.done:
+		default:
+			return t, nil
+		}
+	}
+	if err := ctx.Err(); err != nil {
+		return nil, err
+	}
+	if c.lastErr != nil && time.Since(c.lastErrAt) < retryInterval {
+		return nil, c.lastErr
+	}
+
+	t, err := c.establish(ctx, dialer)
+	if err != nil {
+		c.lastErr, c.lastErrAt = err, time.Now()
+		return nil, err
+	}
+	c.lastErr = nil
+	c.tunnel.Store(t)
+	if c.ctx.Err() != nil {
+		if c.tunnel.CompareAndSwap(t, nil) {
+			t.close()
+		}
+		return nil, errors.New("closed")
+	}
+	return t, nil
+}
+
+func (c *Client) establish(ctx context.Context, dialer internet.Dialer) (*tunnel, error) {
+	ctx, cancel := context.WithTimeout(context.WithoutCancel(ctx), establishTimeout)
+	defer cancel()
+	defer context.AfterFunc(c.ctx, cancel)()
+	conn, err := dialer.Dial(ctx, c.server.Destination)
+	if err != nil {
+		return nil, err
+	}
+	mconn, ok := stat.TryUnwrapStatsConn(conn).(*masque.Conn)
+	if !ok {
+		conn.Close()
+		return nil, errors.New("not a CONNECT-IP connection")
+	}
+	t, err := newTunnel(conn, mconn.LocalAddrs(), c.remoteDNS)
+	if err != nil {
+		conn.Close()
+		return nil, err
+	}
+	errors.LogInfo(ctx, "MASQUE: tunnel established from ", mconn.LocalAddrs())
+	return t, nil
+}
+
+func (c *Client) Close() error {
+	c.cancel()
+	if t := c.tunnel.Swap(nil); t != nil {
+		t.close()
+	}
+	return nil
+}
+
+type tunnel struct {
+	conn      stat.Connection
+	dev       tun.Device
+	tnet      *wireguard.Net
+	done      chan struct{}
+	closeOnce sync.Once
+}
+
+func newTunnel(conn stat.Connection, local []netip.Addr, remoteDNS []netip.Addr) (*tunnel, error) {
+	var dns []netip.Addr
+	for _, addr := range remoteDNS {
+		if slices.ContainsFunc(local, func(l netip.Addr) bool { return l.Is4() == addr.Is4() }) {
+			dns = append(dns, addr)
+		}
+	}
+	if len(dns) == 0 {
+		errors.LogWarning(context.Background(), "MASQUE: no remote DNS server is reachable from the assigned addresses ", local, ", domain names will fail to resolve")
+		dns = remoteDNS
+	}
+
+	dev, tnet, _, err := wireguard.CreateNetTUN(local, dns, masque.MinPacketSize, true)
+	if err != nil {
+		return nil, err
+	}
+	t := &tunnel{
+		conn: conn,
+		dev:  dev,
+		tnet: tnet,
+		done: make(chan struct{}),
+	}
+	go t.readFromTunnel()
+	go t.writeToTunnel()
+	return t, nil
+}
+
+func (t *tunnel) readFromTunnel() {
+	defer t.close()
+	b := make([]byte, buf.Size)
+	for {
+		n, err := t.conn.Read(b)
+		if err != nil {
+			if go_errors.Is(err, io.ErrShortBuffer) {
+				continue
+			}
+			errors.LogInfoInner(context.Background(), err, "MASQUE: tunnel closed")
+			return
+		}
+		t.dev.Write([][]byte{b[:n]}, 0)
+	}
+}
+
+func (t *tunnel) writeToTunnel() {
+	bufs := [][]byte{make([]byte, masque.MinPacketSize)}
+	sizes := []int{0}
+	for {
+		if _, err := t.dev.Read(bufs, sizes, 0); err != nil {
+			return
+		}
+		if _, err := t.conn.Write(bufs[0][:sizes[0]]); err != nil {
+			var ptb *masque.PacketTooBigError
+			if go_errors.As(err, &ptb) {
+				go t.dev.Write([][]byte{ptb.ICMP}, 0)
+			}
+		}
+	}
+}
+
+func (t *tunnel) close() {
+	t.closeOnce.Do(func() {
+		close(t.done)
+		t.conn.Close()
+		t.dev.Close()
+	})
+}
+
+func init() {
+	common.Must(common.RegisterConfig((*ClientConfig)(nil), func(ctx context.Context, config interface{}) (interface{}, error) {
+		return NewClient(ctx, config.(*ClientConfig))
+	}))
+}

proxy/masque/config.pb.go

@@ -0,0 +1,136 @@
+// Code generated by protoc-gen-go. DO NOT EDIT.
+// versions:
+// 	protoc-gen-go v1.36.11
+// 	protoc        v6.33.5
+// source: proxy/masque/config.proto
+
+package masque
+
+import (
+	protocol "github.com/xtls/xray-core/common/protocol"
+	protoreflect "google.golang.org/protobuf/reflect/protoreflect"
+	protoimpl "google.golang.org/protobuf/runtime/protoimpl"
+	reflect "reflect"
+	sync "sync"
+	unsafe "unsafe"
+)
+
+const (
+	// Verify that this generated code is sufficiently up-to-date.
+	_ = protoimpl.EnforceVersion(20 - protoimpl.MinVersion)
+	// Verify that runtime/protoimpl is sufficiently up-to-date.
+	_ = protoimpl.EnforceVersion(protoimpl.MaxVersion - 20)
+)
+
+type ClientConfig struct {
+	state         protoimpl.MessageState   `protogen:"open.v1"`
+	Server        *protocol.ServerEndpoint `protobuf:"bytes,1,opt,name=server,proto3" json:"server,omitempty"`
+	RemoteDns     []string                 `protobuf:"bytes,2,rep,name=remote_dns,json=remoteDns,proto3" json:"remote_dns,omitempty"`
+	unknownFields protoimpl.UnknownFields
+	sizeCache     protoimpl.SizeCache
+}
+
+func (x *ClientConfig) Reset() {
+	*x = ClientConfig{}
+	mi := &file_proxy_masque_config_proto_msgTypes[0]
+	ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+	ms.StoreMessageInfo(mi)
+}
+
+func (x *ClientConfig) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*ClientConfig) ProtoMessage() {}
+
+func (x *ClientConfig) ProtoReflect() protoreflect.Message {
+	mi := &file_proxy_masque_config_proto_msgTypes[0]
+	if x != nil {
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		if ms.LoadMessageInfo() == nil {
+			ms.StoreMessageInfo(mi)
+		}
+		return ms
+	}
+	return mi.MessageOf(x)
+}
+
+// Deprecated: Use ClientConfig.ProtoReflect.Descriptor instead.
+func (*ClientConfig) Descriptor() ([]byte, []int) {
+	return file_proxy_masque_config_proto_rawDescGZIP(), []int{0}
+}
+
+func (x *ClientConfig) GetServer() *protocol.ServerEndpoint {
+	if x != nil {
+		return x.Server
+	}
+	return nil
+}
+
+func (x *ClientConfig) GetRemoteDns() []string {
+	if x != nil {
+		return x.RemoteDns
+	}
+	return nil
+}
+
+var File_proxy_masque_config_proto protoreflect.FileDescriptor
+
+const file_proxy_masque_config_proto_rawDesc = "" +
+	"\n" +
+	"\x19proxy/masque/config.proto\x12\x11xray.proxy.masque\x1a!common/protocol/server_spec.proto\"k\n" +
+	"\fClientConfig\x12<\n" +
+	"\x06server\x18\x01 \x01(\v2$.xray.common.protocol.ServerEndpointR\x06server\x12\x1d\n" +
+	"\n" +
+	"remote_dns\x18\x02 \x03(\tR\tremoteDnsBU\n" +
+	"\x15com.xray.proxy.masqueP\x01Z&github.com/xtls/xray-core/proxy/masque\xaa\x02\x11Xray.Proxy.Masqueb\x06proto3"
+
+var (
+	file_proxy_masque_config_proto_rawDescOnce sync.Once
+	file_proxy_masque_config_proto_rawDescData []byte
+)
+
+func file_proxy_masque_config_proto_rawDescGZIP() []byte {
+	file_proxy_masque_config_proto_rawDescOnce.Do(func() {
+		file_proxy_masque_config_proto_rawDescData = protoimpl.X.CompressGZIP(unsafe.Slice(unsafe.StringData(file_proxy_masque_config_proto_rawDesc), len(file_proxy_masque_config_proto_rawDesc)))
+	})
+	return file_proxy_masque_config_proto_rawDescData
+}
+
+var file_proxy_masque_config_proto_msgTypes = make([]protoimpl.MessageInfo, 1)
+var file_proxy_masque_config_proto_goTypes = []any{
+	(*ClientConfig)(nil),            // 0: xray.proxy.masque.ClientConfig
+	(*protocol.ServerEndpoint)(nil), // 1: xray.common.protocol.ServerEndpoint
+}
+var file_proxy_masque_config_proto_depIdxs = []int32{
+	1, // 0: xray.proxy.masque.ClientConfig.server:type_name -> xray.common.protocol.ServerEndpoint
+	1, // [1:1] is the sub-list for method output_type
+	1, // [1:1] is the sub-list for method input_type
+	1, // [1:1] is the sub-list for extension type_name
+	1, // [1:1] is the sub-list for extension extendee
+	0, // [0:1] is the sub-list for field type_name
+}
+
+func init() { file_proxy_masque_config_proto_init() }
+func file_proxy_masque_config_proto_init() {
+	if File_proxy_masque_config_proto != nil {
+		return
+	}
+	type x struct{}
+	out := protoimpl.TypeBuilder{
+		File: protoimpl.DescBuilder{
+			GoPackagePath: reflect.TypeOf(x{}).PkgPath(),
+			RawDescriptor: unsafe.Slice(unsafe.StringData(file_proxy_masque_config_proto_rawDesc), len(file_proxy_masque_config_proto_rawDesc)),
+			NumEnums:      0,
+			NumMessages:   1,
+			NumExtensions: 0,
+			NumServices:   0,
+		},
+		GoTypes:           file_proxy_masque_config_proto_goTypes,
+		DependencyIndexes: file_proxy_masque_config_proto_depIdxs,
+		MessageInfos:      file_proxy_masque_config_proto_msgTypes,
+	}.Build()
+	File_proxy_masque_config_proto = out.File
+	file_proxy_masque_config_proto_goTypes = nil
+	file_proxy_masque_config_proto_depIdxs = nil
+}

proxy/masque/config.proto

@@ -0,0 +1,14 @@
+syntax = "proto3";
+
+package xray.proxy.masque;
+option csharp_namespace = "Xray.Proxy.Masque";
+option go_package = "github.com/xtls/xray-core/proxy/masque";
+option java_package = "com.xray.proxy.masque";
+option java_multiple_files = true;
+
+import "common/protocol/server_spec.proto";
+
+message ClientConfig {
+  xray.common.protocol.ServerEndpoint server = 1;
+  repeated string remote_dns = 2;
+}

proxy/shadowsocks_2022/outbound.go

@@ -82,6 +82,7 @@ func (o *Outbound) Process(ctx context.Context, link *transport.Link, dialer int
 	if err != nil {
 		return errors.New("failed to connect to server").Base(err)
 	}
+	defer connection.Close()
 
 	if session.TimeoutOnlyFromContext(ctx) {
 		ctx, _ = context.WithCancel(context.Background())

proxy/tun/handler.go

@@ -37,6 +37,25 @@ type Handler struct {
 	downlinkCounter stats.Counter
 }
 
+type tunUDPStatsWriter struct {
+	writer  buf.Writer
+	counter stats.Counter
+}
+
+func (w *tunUDPStatsWriter) WriteMultiBuffer(mb buf.MultiBuffer) error {
+	for len(mb) > 0 {
+		remaining, packet := buf.SplitFirst(mb)
+		packetSize := packet.Len()
+		if err := w.writer.WriteMultiBuffer(buf.MultiBuffer{packet}); err != nil {
+			buf.ReleaseMulti(remaining)
+			return err
+		}
+		w.counter.Add(int64(packetSize))
+		mb = remaining
+	}
+	return nil
+}
+
 // ConnectionHandler interface with the only method that stack is going to push new connections to
 type ConnectionHandler interface {
 	HandleConnection(conn net.Conn, destination net.Destination)
@@ -104,7 +123,7 @@ func (t *Handler) Start() error {
 			iface := updater.Get()
 			if iface == nil {
 				errors.LogInfo(context.Background(), "[tun] falied to set interface > iface == nil")
-				return nil
+				return errors.New("iface not found")
 			}
 			return c.Control(func(fd uintptr) {
 				addrPort, _ := netip.ParseAddrPort(address)
@@ -171,7 +190,8 @@ func (t *Handler) HandleConnection(conn net.Conn, destination net.Destination) {
 		return
 	}
 	source := net.DestinationFromAddr(remote)
-	if t.uplinkCounter != nil || t.downlinkCounter != nil {
+	isUDP := destination.Network == net.Network_UDP
+	if !isUDP && (t.uplinkCounter != nil || t.downlinkCounter != nil) {
 		conn = &stat.CounterConnection{
 			Connection:   conn,
 			ReadCounter:  t.uplinkCounter,
@@ -203,9 +223,18 @@ func (t *Handler) HandleConnection(conn net.Conn, destination net.Destination) {
 	})
 	errors.LogInfo(ctx, "processing from ", source, " to ", destination)
 
+	reader := &buf.TimeoutWrapperReader{Reader: buf.NewReader(conn)}
+	writer := buf.NewWriter(conn)
+	if isUDP {
+		reader.Counter = t.uplinkCounter
+		if t.downlinkCounter != nil {
+			writer = &tunUDPStatsWriter{writer: writer, counter: t.downlinkCounter}
+		}
+	}
+
 	link := &transport.Link{
-		Reader: &buf.TimeoutWrapperReader{Reader: buf.NewReader(conn)},
-		Writer: buf.NewWriter(conn),
+		Reader: reader,
+		Writer: writer,
 	}
 	if err := t.dispatcher.DispatchLink(ctx, destination, link); err != nil {
 		errors.LogError(ctx, errors.New("connection closed").Base(err))

proxy/tun/tun_darwin.go

@@ -11,6 +11,8 @@ import (
 	"os"
 	"strconv"
 	"sync"
+	"sync/atomic"
+	"time"
 	"unsafe"
 
 	"github.com/xtls/xray-core/common/buf"
@@ -38,21 +40,111 @@ const (
 	ND6_INFINITE_LIFETIME = 0xFFFFFFFF // netinet6/nd6.h
 )
 
-//go:linkname procyield runtime.procyield
-func procyield(cycles uint32)
-
 type DarwinTun struct {
 	tunFile *os.File
 	options *Config
 	tunFd   int
 	ownsFd  bool // true for macOS (we created the fd), false for iOS (fd from system)
 
+	// Genuinely blocks Wait() until tunFd is readable, instead of the
+	// previous procyield-only busy-spin (dispatchLoop in
+	// stack_gvisor_endpoint.go calls ReadPacket() then Wait() in a tight
+	// loop with no other throttling whenever the queue is empty -- with
+	// only procyield(1), that pins a full CPU core for as long as the
+	// tunnel is up, observed causing severe device heating/thermal
+	// shutdown). nil if kqueue setup failed, in which case Wait() falls
+	// back to a bounded time.Sleep instead. See waitKqueue's own doc
+	// comment for why this is a dedicated type rather than a bare fd.
+	waitKq *waitKqueue
+
 	routeMonitor     *os.File
 	routeMonitorOnce sync.Once
 	systemRoutes     []netip.Prefix
 	gateway          netip.Prefix
 }
 
+// waitKqueue owns a kqueue fd used by DarwinTun.Wait() to block on
+// read-readiness. Closing and waiting can race from different goroutines
+// (Close() from the caller that tears down the tunnel, Wait() from
+// dispatchLoop's own goroutine) -- reviewer feedback on XTLS/Xray-core#6580
+// found that a bare `int` fd field let Close() race Wait()'s use of the
+// same fd number, and on Darwin a closed fd number can be reused by an
+// unrelated concurrent open() before Wait() gets to call Kevent on it,
+// so Wait() could end up polling (or Close() could end up closing) a
+// completely unrelated file descriptor. This type makes closing
+// idempotent (sync.Once) and gates every Kevent call behind an atomic
+// "closed" flag checked immediately before the syscall, so Wait() never
+// issues a kevent syscall against a fd number that Close() has already
+// (or is concurrently) invalidated -- there's still a narrow window where
+// Wait() checks-then-uses the fd, but Close() only actually closes it
+// after Wait() cannot start a new syscall on it (the flag is set first,
+// synchronized with acquire/release semantics), which is sufficient since
+// Wait()'s Kevent call itself is what's being raced, not a fd read/write.
+type waitKqueue struct {
+	fd     int
+	closed atomic.Bool
+	once   sync.Once
+}
+
+// newWaitKqueue creates a kqueue registered for read-readiness on fd, for
+// Wait() to block on. Returns nil if anything fails, so callers can fall
+// back to a bounded sleep rather than error out of NewTun over what is
+// purely a CPU-efficiency concern.
+func newWaitKqueue(fd int) *waitKqueue {
+	kq, err := unix.Kqueue()
+	if err != nil {
+		return nil
+	}
+	_, err = unix.Kevent(kq, []unix.Kevent_t{{
+		Ident:  uint64(fd),
+		Filter: unix.EVFILT_READ,
+		Flags:  unix.EV_ADD | unix.EV_ENABLE,
+	}}, nil, nil)
+	if err != nil {
+		_ = unix.Close(kq)
+		return nil
+	}
+	return &waitKqueue{fd: kq}
+}
+
+// wait blocks until the registered fd is readable, timeout elapses, or a
+// benign interrupt occurs -- all three are "this kqueue is still healthy,
+// the caller should just try again" and return true; the caller
+// (DarwinTun.Wait) doesn't need to distinguish them since it always calls
+// ReadPacket() right after anyway, and that already handles "nothing was
+// actually there" via ErrQueueEmpty. Returns false only when the kqueue
+// itself is no longer usable -- already closed, or the kevent syscall
+// failed for a reason other than EINTR -- see its own call site in
+// DarwinTun.Wait for why a persistent failure must not be silently
+// retried forever (reviewer feedback, XTLS/Xray-core#6580 P2).
+func (w *waitKqueue) wait(timeout time.Duration) (ok bool) {
+	if w.closed.Load() {
+		return false
+	}
+	events := make([]unix.Kevent_t, 1)
+	ts := unix.NsecToTimespec(timeout.Nanoseconds())
+	_, err := unix.Kevent(w.fd, nil, events, &ts)
+	if err != nil {
+		return errors.Is(err, unix.EINTR)
+	}
+	return true
+}
+
+// close marks the kqueue as unusable (so any Wait() call that hasn't yet
+// entered the kevent syscall bails out instead) and closes the underlying
+// fd exactly once, regardless of how many times close is called or
+// whether it races a Wait() already inside its kevent syscall (that call
+// either completes against the still-open fd or returns an error safely
+// -- either way, no other goroutine can be handed this fd number in
+// between the atomic flag flip and the actual close, since nothing else
+// in this type ever creates a new kqueue with the same field).
+func (w *waitKqueue) close() {
+	w.once.Do(func() {
+		w.closed.Store(true)
+		_ = unix.Close(w.fd)
+	})
+}
+
 var (
 	_ Tun          = (*DarwinTun)(nil)
 	_ GVisorDevice = (*DarwinTun)(nil)
@@ -77,6 +169,7 @@ func NewTun(options *Config) (Tun, error) {
 			options: options,
 			tunFd:   fd,
 			ownsFd:  false,
+			waitKq:  newWaitKqueue(fd),
 		}, nil
 	}
 
@@ -103,6 +196,7 @@ func NewTun(options *Config) (Tun, error) {
 		options: options,
 		tunFd:   int(tunFile.Fd()),
 		ownsFd:  true,
+		waitKq:  newWaitKqueue(int(tunFile.Fd())),
 		gateway: gateway,
 	}, nil
 }
@@ -134,6 +228,9 @@ func (t *DarwinTun) Close() error {
 			_ = t.routeMonitor.Close()
 		}
 	})
+	if t.waitKq != nil {
+		t.waitKq.close()
+	}
 	routeErr := t.unsetSystemRoutes()
 	if t.ownsFd {
 		return xerrors.Combine(routeErr, t.tunFile.Close())
@@ -242,9 +339,43 @@ func (t *DarwinTun) ReadPacket() (byte, *stack.PacketBuffer, error) {
 	}), nil
 }
 
-// Wait some cpu cycles
+// Wait blocks until tunFd is readable (or a short timeout elapses), rather
+// than spinning the CPU -- see the waitKq field's own doc comment. A bounded
+// timeout (not an indefinite wait) keeps this responsive to a Close() that
+// happens to race a call already parked here.
+//
+// Reviewer feedback (XTLS/Xray-core#6580, P2): the original version
+// discarded every error from the underlying kevent syscall. dispatchLoop
+// (stack_gvisor_endpoint.go) calls ReadPacket() then Wait() in an
+// unconditional tight loop -- if kevent started failing at runtime for a
+// persistent reason (not just a benign EINTR), Wait() returning
+// immediately every time reintroduces exactly the busy-spin this whole
+// change exists to remove, just routed through a failing syscall instead
+// of procyield. waitKq.wait's own bool return distinguishes "genuinely
+// interrupted, try again" from "this kqueue is unusable now" -- Wait()
+// permanently falls back to the sleep path once that happens, rather than
+// retrying the same broken kqueue forever.
 func (t *DarwinTun) Wait() {
-	procyield(1)
+	if t.waitKq != nil && t.waitKq.wait(time.Second) {
+		return
+	}
+	if t.waitKq != nil {
+		// Persistent kevent failure (not a benign EINTR, and not just
+		// "the 1s timeout elapsed with nothing to read" -- wait() already
+		// returned true for both of those cases above). Stop trusting
+		// this kqueue for the rest of this DarwinTun's lifetime instead of
+		// re-attempting a syscall that's already shown it won't succeed.
+		t.waitKq.close()
+		t.waitKq = nil
+	}
+	// Reviewer feedback (XTLS/Xray-core#6580): procyield here is the same
+	// busy-spin this whole change exists to remove, just gated behind an
+	// edge case (kqueue setup failing, which practically never happens on
+	// real Darwin systems, or having just failed permanently above)
+	// instead of always -- a genuine bounded sleep actually yields the CPU
+	// instead of being a near-instant scheduler hint that lets the tight
+	// dispatchLoop caller spin just as hot as before.
+	time.Sleep(time.Millisecond)
 }
 
 func (t *DarwinTun) newEndpoint() (stack.LinkEndpoint, error) {

proxy/tun/tun_darwin_test.go

@@ -3,7 +3,11 @@
 package tun
 
 import (
+	"sync"
 	"testing"
+	"time"
+
+	"golang.org/x/sys/unix"
 )
 
 func TestSelectDarwinGatewayDefault(t *testing.T) {
@@ -47,3 +51,183 @@ func TestSelectDarwinGatewayRequiresUsableLocalAddress(t *testing.T) {
 		t.Fatal("expected error")
 	}
 }
+
+// newTestSocketpair returns a connected AF_UNIX/SOCK_DGRAM pair -- a real
+// fd DarwinTun.Wait's kqueue can register EVFILT_READ against, without
+// needing an actual utun interface (which requires root/network
+// entitlements this test environment doesn't have). Datagram sockets
+// (unlike pipes) support both "write makes readable" and "close makes
+// readable" the same way a tun fd's read-readiness behaves.
+func newTestSocketpair(t *testing.T) (a, b int) {
+	t.Helper()
+	fds, err := unix.Socketpair(unix.AF_UNIX, unix.SOCK_DGRAM, 0)
+	if err != nil {
+		t.Fatalf("socketpair: %v", err)
+	}
+	t.Cleanup(func() {
+		_ = unix.Close(fds[0])
+		_ = unix.Close(fds[1])
+	})
+	return fds[0], fds[1]
+}
+
+// Reviewer feedback, XTLS/Xray-core#6580: "blocking with no data" case --
+// wait() must not return before the timeout when nothing is written.
+func TestWaitKqueueBlocksWithNoData(t *testing.T) {
+	a, _ := newTestSocketpair(t)
+	kq := newWaitKqueue(a)
+	if kq == nil {
+		t.Fatal("newWaitKqueue returned nil")
+	}
+	defer kq.close()
+
+	start := time.Now()
+	ok := kq.wait(150 * time.Millisecond)
+	elapsed := time.Since(start)
+
+	if !ok {
+		t.Fatal("wait() returned false on a healthy kqueue with a plain timeout")
+	}
+	if elapsed < 100*time.Millisecond {
+		t.Fatalf("wait() returned after only %v, expected it to block close to the 150ms timeout", elapsed)
+	}
+}
+
+// Reviewer feedback: "wake up with a readable fd" case.
+func TestWaitKqueueWakesOnReadable(t *testing.T) {
+	a, b := newTestSocketpair(t)
+	kq := newWaitKqueue(a)
+	if kq == nil {
+		t.Fatal("newWaitKqueue returned nil")
+	}
+	defer kq.close()
+
+	done := make(chan bool, 1)
+	go func() {
+		done <- kq.wait(5 * time.Second)
+	}()
+
+	time.Sleep(20 * time.Millisecond) // let wait() actually enter the syscall first
+	if _, err := unix.Write(b, []byte{0x1}); err != nil {
+		t.Fatalf("write: %v", err)
+	}
+
+	select {
+	case ok := <-done:
+		if !ok {
+			t.Fatal("wait() returned false after the fd became readable")
+		}
+	case <-time.After(2 * time.Second):
+		t.Fatal("wait() did not wake up within 2s of the fd becoming readable")
+	}
+}
+
+// Reviewer feedback: "timeout" case, explicitly (distinct from the
+// no-data test above, which also checks blocking duration -- this one
+// only checks the return value).
+func TestWaitKqueueTimesOut(t *testing.T) {
+	a, _ := newTestSocketpair(t)
+	kq := newWaitKqueue(a)
+	if kq == nil {
+		t.Fatal("newWaitKqueue returned nil")
+	}
+	defer kq.close()
+
+	if !kq.wait(50 * time.Millisecond) {
+		t.Fatal("wait() returned false on a plain timeout with no error condition")
+	}
+}
+
+// Reviewer feedback: "Close() wakes a blocked wait" case, and the
+// no-double-close/no-fd-reuse concern (P1) -- close() while wait() is
+// parked in its syscall must not panic, must not leave wait() hung, and a
+// second close() call (from a caller that, say, calls Close() twice on
+// the same DarwinTun) must be safe.
+func TestWaitKqueueCloseDuringWaitIsSafe(t *testing.T) {
+	a, _ := newTestSocketpair(t)
+	kq := newWaitKqueue(a)
+	if kq == nil {
+		t.Fatal("newWaitKqueue returned nil")
+	}
+
+	started := make(chan struct{})
+	done := make(chan bool, 1)
+	go func() {
+		close(started)
+		done <- kq.wait(5 * time.Second)
+	}()
+
+	<-started
+	time.Sleep(20 * time.Millisecond) // let wait() actually enter the syscall first
+	kq.close()
+	kq.close() // double-close must be idempotent, not panic or double-free the fd
+
+	select {
+	case <-done:
+		// Either true (the close-of-the-underlying-fd unblocked kevent, a
+		// real kqueue behavior) or false (wait() observed the closed flag
+		// first) is acceptable -- what matters is that it returned at all,
+		// promptly, without hanging or crashing.
+	case <-time.After(2 * time.Second):
+		t.Fatal("wait() did not return within 2s of close() being called")
+	}
+
+	// A wait() call *after* close() must return false immediately (the
+	// closed-flag fast path), not attempt a syscall against the
+	// already-closed (and potentially since-reused, on a real system) fd
+	// number.
+	if kq.wait(time.Second) {
+		t.Fatal("wait() returned true after close() -- should short-circuit via the closed flag")
+	}
+}
+
+// Reviewer feedback: "multiple/concurrent close guard" case -- many
+// goroutines calling close() concurrently must close the underlying fd
+// exactly once.
+func TestWaitKqueueConcurrentCloseIsSafe(t *testing.T) {
+	a, _ := newTestSocketpair(t)
+	kq := newWaitKqueue(a)
+	if kq == nil {
+		t.Fatal("newWaitKqueue returned nil")
+	}
+
+	var wg sync.WaitGroup
+	for range 20 {
+		wg.Add(1)
+		go func() {
+			defer wg.Done()
+			kq.close()
+		}()
+	}
+	wg.Wait()
+
+	if !kq.closed.Load() {
+		t.Fatal("closed flag not set after concurrent close() calls")
+	}
+}
+
+// Reviewer feedback: "kevent runtime failure without spinning" case (P2).
+// Simulates a kqueue that has gone bad (closed out from under it, as if a
+// concurrent/erroneous close happened) and confirms wait() reports it as
+// unusable (false) rather than silently returning true forever, which is
+// what DarwinTun.Wait relies on to permanently fall back to the sleep
+// path instead of re-entering a failing syscall on every dispatchLoop
+// iteration.
+func TestWaitKqueueReportsPersistentFailure(t *testing.T) {
+	a, _ := newTestSocketpair(t)
+	kq := newWaitKqueue(a)
+	if kq == nil {
+		t.Fatal("newWaitKqueue returned nil")
+	}
+	// Close the underlying kqueue fd directly (bypassing kq.close(), which
+	// would also set the closed flag) to simulate the fd going bad for a
+	// reason other than this type's own close() -- e.g. some other code
+	// path in the process closing it, or the kernel invalidating it.
+	_ = unix.Close(kq.fd)
+
+	for i := 0; i < 5; i++ {
+		if kq.wait(50 * time.Millisecond) {
+			t.Fatalf("wait() call %d returned true against a closed underlying fd -- should report failure, not spin", i)
+		}
+	}
+}

proxy/tun/tun_freebsd.go

@@ -3,28 +3,60 @@
 package tun
 
 import (
+	"context"
 	"errors"
 	"net"
-	_ "unsafe"
+	"net/netip"
+	"os"
+	"slices"
+	"sync"
+	"unsafe"
 
 	"golang.zx2c4.com/wireguard/tun"
 	"gvisor.dev/gvisor/pkg/buffer"
 	"gvisor.dev/gvisor/pkg/tcpip"
 	"gvisor.dev/gvisor/pkg/tcpip/stack"
 
+	"golang.org/x/net/route"
 	"golang.org/x/sys/unix"
 
 	"github.com/xtls/xray-core/common/buf"
+	xerrors "github.com/xtls/xray-core/common/errors"
 )
 
-const tunHeaderSize = 4
+const (
+	tunHeaderSize         = 4
+	defaultFreeBSDGateway = "169.254.10.1/30"
+
+	// escapeFib is the routing table outbound sockets are switched to so
+	// their traffic bypasses the TUN routes installed in the default FIB
+	// (FreeBSD's substitute for the per-socket interface binding other
+	// platforms use). Requires the boot tunable net.fibs >= 2.
+	escapeFib = 1
+)
 
 //go:linkname procyield runtime.procyield
 func procyield(cycles uint32)
 
 type FreeBSDTun struct {
-	device tun.Device
-	mtu    uint32
+	device        tun.Device
+	options       *Config
+	tunIndex      int
+	autoInterface bool
+
+	systemRoutes     []netip.Prefix
+	escapeMu         sync.Mutex
+	escapeRoutes     []escapeRoute
+	routeMonitor     *os.File
+	routeMonitorOnce sync.Once
+}
+
+// escapeRoute remembers one route written into the escape FIB, in the exact
+// shape needed to delete it again. A zero gateway means an interface route.
+type escapeRoute struct {
+	prefix  netip.Prefix
+	ifIndex int
+	gateway netip.Addr
 }
 
 var (
@@ -34,20 +66,172 @@ var (
 
 // NewTun builds new tun interface handler
 func NewTun(options *Config) (Tun, error) {
+	gateway, local, err := selectFreeBSDGateway(options.Gateway)
+	if err != nil {
+		return nil, err
+	}
+
+	// net.fibs is a boot-time constant, so validate the escape routing table
+	// before the shared handler registers a dialer controller that would
+	// otherwise steer every outbound socket into a table that was never set up.
+	if options.AutoOutboundsInterface != "" {
+		if err := checkEscapeFib(); err != nil {
+			return nil, err
+		}
+	}
+
 	tunDev, err := tun.CreateTUN(options.Name, int(options.MTU))
 	if err != nil {
 		return nil, err
 	}
 
-	return &FreeBSDTun{device: tunDev, mtu: options.MTU}, nil
+	name, err := tunDev.Name()
+	if err != nil {
+		_ = tunDev.Close()
+		return nil, err
+	}
+	// From here the interface exists in the kernel; the wireguard library does
+	// not remove it on Close, so every failure path must destroy it too or the
+	// next start fails with "interface already exists".
+	iface, err := net.InterfaceByName(name)
+	if err != nil {
+		_ = tunDev.Close()
+		destroyInterface(name)
+		return nil, err
+	}
+	if err := setIPAddress(name, gateway, local, iface.Index); err != nil {
+		_ = tunDev.Close()
+		destroyInterface(name)
+		return nil, err
+	}
+
+	return &FreeBSDTun{
+		device:        tunDev,
+		options:       options,
+		tunIndex:      iface.Index,
+		autoInterface: options.AutoOutboundsInterface != "",
+	}, nil
+}
+
+// selectFreeBSDGateway picks the first IPv4 prefix from the configured gateway
+// list and the local address derived from it (the darwin semantics: the
+// gateway is the remote side of the point-to-point pair, the local address is
+// the next one after it), falling back to the same link-local default.
+func selectFreeBSDGateway(configured []string) (netip.Prefix, netip.Addr, error) {
+	gateway := netip.MustParsePrefix(defaultFreeBSDGateway)
+	if len(configured) > 0 {
+		found := false
+		for _, value := range configured {
+			prefix, err := netip.ParsePrefix(value)
+			if err != nil {
+				return netip.Prefix{}, netip.Addr{}, xerrors.New("invalid FreeBSD gateway ", value).Base(err)
+			}
+			if prefix.Addr().Is4() {
+				gateway, found = prefix, true
+				break
+			}
+		}
+		if !found {
+			return netip.Prefix{}, netip.Addr{}, xerrors.New("FreeBSD gateway requires at least one IPv4 prefix")
+		}
+	}
+
+	local, ok := nextLocalIPv4(gateway)
+	if !ok || !gateway.Contains(local) {
+		return netip.Prefix{}, netip.Addr{}, xerrors.New("FreeBSD gateway ", gateway.String(), " must contain at least one usable local IPv4 address after the gateway address")
+	}
+	return gateway, local, nil
+}
+
+func nextLocalIPv4(gateway netip.Prefix) (netip.Addr, bool) {
+	local4 := gateway.Addr().As4()
+	for i := len(local4) - 1; i >= 0; i-- {
+		local4[i]++
+		if local4[i] != 0 {
+			return netip.AddrFrom4(local4), true
+		}
+	}
+	return netip.Addr{}, false
 }
 
 func (t *FreeBSDTun) Start() error {
+	if err := t.setSystemRoutes(); err != nil {
+		return err
+	}
+
+	// Gate on this instance's own option, not the package-global updater,
+	// which a previously-removed inbound may have left set. checkEscapeFib
+	// already ran in NewTun, before the dialer controller was registered.
+	if t.autoInterface {
+		if err := t.syncEscapeFib(); err != nil {
+			_ = t.unsetSystemRoutes()
+			return err
+		}
+		fd, err := unix.Socket(unix.AF_ROUTE, unix.SOCK_RAW, 0)
+		if err != nil {
+			t.unsetEscapeFib()
+			_ = t.unsetSystemRoutes()
+			return err
+		}
+		t.routeMonitor = os.NewFile(uintptr(fd), "xray-route-monitor")
+		go t.monitorRouteChanges()
+	}
 	return nil
 }
 
+// monitorRouteChanges refreshes the outbound interface and the escape FIB
+// mirror whenever the system routing table changes.
+func (t *FreeBSDTun) monitorRouteChanges() {
+	buffer := make([]byte, 64*1024)
+	for {
+		if _, err := t.routeMonitor.Read(buffer); err != nil {
+			if !errors.Is(err, os.ErrClosed) {
+				xerrors.LogInfoInner(context.Background(), err, "[tun] failed to monitor route changes")
+			}
+			return
+		}
+		if updater != nil {
+			updater.Update()
+		}
+		if err := t.syncEscapeFib(); err != nil {
+			xerrors.LogInfoInner(context.Background(), err, "[tun] failed to refresh escape routes")
+		}
+	}
+}
+
 func (t *FreeBSDTun) Close() error {
-	return t.device.Close()
+	t.routeMonitorOnce.Do(func() {
+		if t.routeMonitor != nil {
+			_ = t.routeMonitor.Close()
+		}
+	})
+	t.unsetEscapeFib()
+	routeErr := t.unsetSystemRoutes()
+	name, nameErr := t.Name()
+	closeErr := t.device.Close()
+	// The wireguard tun device does not tear the interface down on FreeBSD,
+	// so an unclean shutdown would leave utun<n> behind and the next start
+	// would fail with "interface already exists"; destroy it explicitly.
+	if nameErr == nil {
+		destroyInterface(name)
+	}
+	return xerrors.Combine(routeErr, closeErr)
+}
+
+func destroyInterface(name string) {
+	fd, err := unix.Socket(unix.AF_INET, unix.SOCK_DGRAM, 0)
+	if err != nil {
+		return
+	}
+	defer unix.Close(fd)
+	// struct ifreq: 16-byte name + a 16-byte union (SIOCIFDESTROY's encoded
+	// length is 32 bytes on amd64, and the kernel copies in all of it).
+	var req struct {
+		Name [unix.IFNAMSIZ]byte
+		_    [16]byte
+	}
+	copy(req.Name[:], name)
+	_ = ioctlPtr(fd, unix.SIOCIFDESTROY, unsafe.Pointer(&req))
 }
 
 func (t *FreeBSDTun) Name() (string, error) {
@@ -55,21 +239,13 @@ func (t *FreeBSDTun) Name() (string, error) {
 }
 
 func (t *FreeBSDTun) Index() (int, error) {
-	name, err := t.Name()
-	if err != nil {
-		return 0, err
-	}
-	iface, err := net.InterfaceByName(name)
-	if err != nil {
-		return 0, err
-	}
-	return iface.Index, nil
+	return t.tunIndex, nil
 }
 
 // WritePacket implements GVisorDevice method to write one packet to the tun device
 func (t *FreeBSDTun) WritePacket(packet *stack.PacketBuffer) tcpip.Error {
 	// request memory to write from reusable buffer pool
-	b := buf.NewWithSize(int32(t.mtu) + tunHeaderSize)
+	b := buf.NewWithSize(int32(t.options.MTU) + tunHeaderSize)
 	defer b.Release()
 
 	// prepare Unix specific packet header
@@ -104,7 +280,7 @@ func (t *FreeBSDTun) WritePacket(packet *stack.PacketBuffer) tcpip.Error {
 // which will make the stack call Wait which should implement desired push-back
 func (t *FreeBSDTun) ReadPacket() (byte, *stack.PacketBuffer, error) {
 	// request memory to write from reusable buffer pool
-	b := buf.NewWithSize(int32(t.mtu) + tunHeaderSize)
+	b := buf.NewWithSize(int32(t.options.MTU) + tunHeaderSize)
 
 	// read the bytes to the interface file
 	n, err := b.ReadFrom(t.device.File())
@@ -141,23 +317,551 @@ func (t *FreeBSDTun) Wait() {
 }
 
 func (t *FreeBSDTun) newEndpoint() (stack.LinkEndpoint, error) {
-	return &LinkEndpoint{deviceMTU: t.mtu, device: t}, nil
+	return &LinkEndpoint{deviceMTU: t.options.MTU, device: t}, nil
 }
 
-func setinterface(network, address string, fd uintptr, iface *net.Interface) error {
+const (
+	IN6_IFF_NODAD         = 0x0020     // netinet6/in6_var.h
+	ND6_INFINITE_LIFETIME = 0xFFFFFFFF // netinet6/nd6.h
+)
+
+// ifAliasReq4 is struct in_aliasreq from netinet/in_var.h in the 64-byte
+// layout unix.SIOCAIFADDR encodes (name + addr/dstaddr/mask sockaddrs).
+type ifAliasReq4 struct {
+	Name    [unix.IFNAMSIZ]byte
+	Addr    unix.RawSockaddrInet4
+	Dstaddr unix.RawSockaddrInet4
+	Mask    unix.RawSockaddrInet4
+}
+
+// ifAliasReq6 is struct in6_aliasreq from netinet6/in6_var.h. The trailing
+// Vhid field matters: unix.SIOCAIFADDR_IN6 is not in x/sys/unix, so
+// siocaifaddrIn6 is derived from this struct's size, and the kernel only
+// accepts the ioctl whose encoded length matches the real struct.
+type ifAliasReq6 struct {
+	Name       [unix.IFNAMSIZ]byte
+	Addr       unix.RawSockaddrInet6
+	Dstaddr    unix.RawSockaddrInet6
+	Prefixmask unix.RawSockaddrInet6
+	Flags      int32
+	Lifetime   addrLifetime6
+	Vhid       int32
+}
+
+// addrLifetime6 is struct in6_addrlifetime (time_t is int64 on freebsd/amd64).
+type addrLifetime6 struct {
+	Expire    int64
+	Preferred int64
+	Vltime    uint32
+	Pltime    uint32
+}
+
+// SIOCAIFADDR_IN6 = _IOW('i', 27, struct in6_aliasreq); x/sys/unix does not
+// carry the netinet6 ioctls, so encode it from the struct size like the
+// header macro does.
+const siocaifaddrIn6 = 0x80000000 | (uintptr(unsafe.Sizeof(ifAliasReq6{})) << 16) | ('i' << 8) | 27
+
+// setIPAddress assigns the local/remote point-to-point IPv4 pair and a
+// link-local IPv6 address to the interface, required for the routing to work
+// (same scheme as the darwin implementation: local address is the one right
+// after the gateway address).
+func setIPAddress(name string, gateway netip.Prefix, local netip.Addr, ifIndex int) error {
+	socket4, err := unix.Socket(unix.AF_INET, unix.SOCK_DGRAM, 0)
+	if err != nil {
+		return err
+	}
+	defer unix.Close(socket4)
+
+	local4 := local.As4()
+
+	ifReq4 := ifAliasReq4{
+		Addr: unix.RawSockaddrInet4{
+			Len:    unix.SizeofSockaddrInet4,
+			Family: unix.AF_INET,
+			Addr:   local4,
+		},
+		Dstaddr: unix.RawSockaddrInet4{
+			Len:    unix.SizeofSockaddrInet4,
+			Family: unix.AF_INET,
+			Addr:   gateway.Addr().As4(),
+		},
+		Mask: unix.RawSockaddrInet4{
+			Len:    unix.SizeofSockaddrInet4,
+			Family: unix.AF_INET,
+			Addr:   prefixMask4(gateway.Bits()),
+		},
+	}
+	copy(ifReq4.Name[:], name)
+	if err = ioctlPtr(socket4, unix.SIOCAIFADDR, unsafe.Pointer(&ifReq4)); err != nil {
+		return os.NewSyscallError("SIOCAIFADDR", err)
+	}
+
+	socket6, err := unix.Socket(unix.AF_INET6, unix.SOCK_DGRAM, 0)
+	if err != nil {
+		return err
+	}
+	defer unix.Close(socket6)
+
+	// link-local ipv6 address with suffix from ipv4, enough for v6 interface
+	// routes to be attachable (darwin parity); a link-local address needs its
+	// scope, which for FreeBSD ioctls is the interface index
+	local6 := netip.AddrFrom16([16]byte{0: 0xfe, 1: 0x80, 12: local4[0], 13: local4[1], 14: local4[2], 15: local4[3]})
+
+	ifReq6 := ifAliasReq6{
+		Addr: unix.RawSockaddrInet6{
+			Len:      unix.SizeofSockaddrInet6,
+			Family:   unix.AF_INET6,
+			Addr:     local6.As16(),
+			Scope_id: uint32(ifIndex),
+		},
+		Prefixmask: unix.RawSockaddrInet6{
+			Len:    unix.SizeofSockaddrInet6,
+			Family: unix.AF_INET6,
+			Addr:   prefixMask6(64),
+		},
+		Flags: IN6_IFF_NODAD,
+		Lifetime: addrLifetime6{
+			Vltime: ND6_INFINITE_LIFETIME,
+			Pltime: ND6_INFINITE_LIFETIME,
+		},
+	}
+	copy(ifReq6.Name[:], name)
+	if err = ioctlPtr(socket6, uint(siocaifaddrIn6), unsafe.Pointer(&ifReq6)); err != nil {
+		// non-fatal: FreeBSD auto-configures a link-local address on UP
+		// interfaces, which is all the v6 interface routes need
+		xerrors.LogInfoInner(context.Background(), os.NewSyscallError("SIOCAIFADDR_IN6", err), "[tun] failed to assign the IPv6 link-local address")
+	}
+
 	return nil
 }
 
-func findOutboundInterface(tunIndex int, fixedName string) (*net.Interface, error) {
-	if fixedName == "" {
-		return nil, errors.New("automatic outbound interface selection is not supported on this platform")
+func ioctlPtr(fd int, req uint, arg unsafe.Pointer) error {
+	_, _, errno := unix.Syscall(unix.SYS_IOCTL, uintptr(fd), uintptr(req), uintptr(arg))
+	if errno != 0 {
+		return errno
 	}
-	iface, err := net.InterfaceByName(fixedName)
+	return nil
+}
+
+func prefixMask4(bits int) [4]byte {
+	var mask [4]byte
+	copy(mask[:], net.CIDRMask(bits, 32))
+	return mask
+}
+
+func prefixMask6(bits int) [16]byte {
+	var mask [16]byte
+	copy(mask[:], net.CIDRMask(bits, 128))
+	return mask
+}
+
+// setinterface is the per-socket half of autoOutboundsInterface. FreeBSD has
+// no SO_BINDTODEVICE/IP_BOUND_IF equivalent, so the socket is pointed at the
+// escape FIB instead, where Start() mirrors the physical default route; the
+// iface argument is resolved by the shared updater but unused here (the escape
+// is table-based, not a per-socket interface bind). checkEscapeFib in NewTun
+// guarantees the FIB exists before this can run.
+func setinterface(network, address string, fd uintptr, iface *net.Interface) error {
+	return unix.SetsockoptInt(int(fd), unix.SOL_SOCKET, unix.SO_SETFIB, escapeFib)
+}
+
+func (t *FreeBSDTun) setSystemRoutes() error {
+	routes, err := buildSystemRoutes(t.options.AutoSystemRoutingTable)
+	if err != nil {
+		return err
+	}
+	// Route through the interface, not a gateway: the tun(4) device is a
+	// broadcast interface here, so its point-to-point peer address doubles as
+	// the subnet broadcast and the kernel refuses to route to it (EACCES).
+	// Interface routes sidestep the gateway entirely (what wg-quick does on
+	// FreeBSD).
+	for _, destination := range routes {
+		if err := execRoute(-1, unix.RTM_ADD, t.tunIndex, destination, netip.Addr{}); err != nil {
+			_ = t.unsetSystemRoutes()
+			return xerrors.New("failed to add system route ", destination).Base(err)
+		}
+		t.systemRoutes = append(t.systemRoutes, destination)
+	}
+	return nil
+}
+
+func (t *FreeBSDTun) unsetSystemRoutes() error {
+	var errs []error
+	for i := len(t.systemRoutes) - 1; i >= 0; i-- {
+		destination := t.systemRoutes[i]
+		if err := execRoute(-1, unix.RTM_DELETE, t.tunIndex, destination, netip.Addr{}); err != nil && !errors.Is(err, unix.ESRCH) {
+			errs = append(errs, xerrors.New("failed to delete system route ", destination).Base(err))
+		}
+	}
+	t.systemRoutes = nil
+	return xerrors.Combine(errs...)
+}
+
+func buildSystemRoutes(configured []string) ([]netip.Prefix, error) {
+	routes := make([]netip.Prefix, 0, len(configured))
+	seen := make(map[netip.Prefix]struct{})
+
+	appendRoute := func(prefix netip.Prefix) {
+		prefix = prefix.Masked()
+		if _, found := seen[prefix]; found {
+			return
+		}
+		seen[prefix] = struct{}{}
+		routes = append(routes, prefix)
+	}
+
+	for _, value := range configured {
+		prefix, err := netip.ParsePrefix(value)
+		if err != nil {
+			return nil, xerrors.New("invalid system route ", value).Base(err)
+		}
+		if prefix.Bits() == 0 {
+			for _, protected := range protectedDefaultRoutes(prefix.Addr().Is4()) {
+				appendRoute(protected)
+			}
+			continue
+		}
+		appendRoute(prefix)
+	}
+
+	return routes, nil
+}
+
+// protectedDefaultRoutes splits a full default route into eight more-specific
+// prefixes covering everything but the zero /8, so the system's real default
+// route stays in place for outbound interface discovery (darwin parity).
+func protectedDefaultRoutes(ipv4 bool) []netip.Prefix {
+	routes := make([]netip.Prefix, 0, 8)
+	for i := 0; i < 8; i++ {
+		if ipv4 {
+			var address [4]byte
+			address[0] = 1 << i
+			routes = append(routes, netip.PrefixFrom(netip.AddrFrom4(address), 8-i))
+		} else {
+			var address [16]byte
+			address[0] = 1 << i
+			routes = append(routes, netip.PrefixFrom(netip.AddrFrom16(address), 8-i))
+		}
+	}
+	return routes
+}
+
+// execRoute writes one RTM message to a routing socket. fib >= 0 targets that
+// routing table via SO_SETFIB on the routing socket (what route(8) -fib
+// does); fib -1 leaves the process default table. An invalid gateway produces
+// an interface route pinned to interfaceIndex instead of a gateway route.
+func execRoute(fib int, messageType int, interfaceIndex int, destination netip.Prefix, gateway netip.Addr) error {
+	message := route.RouteMessage{
+		Type:    messageType,
+		Version: unix.RTM_VERSION,
+		Flags:   unix.RTF_STATIC | unix.RTF_GATEWAY,
+		Seq:     1,
+	}
+	if messageType == unix.RTM_ADD {
+		message.Flags |= unix.RTF_UP
+	}
+
+	var gatewayAddr route.Addr
+	switch {
+	case !gateway.IsValid():
+		message.Flags &^= unix.RTF_GATEWAY
+		message.Index = interfaceIndex
+		gatewayAddr = &route.LinkAddr{Index: interfaceIndex}
+	case gateway.Is4():
+		gatewayAddr = &route.Inet4Addr{IP: gateway.As4()}
+	default:
+		gatewayAddr = &route.Inet6Addr{IP: gateway.As16()}
+	}
+
+	if destination.Addr().Is4() {
+		message.Addrs = []route.Addr{
+			unix.RTAX_DST:     &route.Inet4Addr{IP: destination.Addr().As4()},
+			unix.RTAX_NETMASK: &route.Inet4Addr{IP: prefixMask4(destination.Bits())},
+			unix.RTAX_GATEWAY: gatewayAddr,
+		}
+	} else {
+		message.Addrs = []route.Addr{
+			unix.RTAX_DST:     &route.Inet6Addr{IP: destination.Addr().As16()},
+			unix.RTAX_NETMASK: &route.Inet6Addr{IP: prefixMask6(destination.Bits())},
+			unix.RTAX_GATEWAY: gatewayAddr,
+		}
+	}
+
+	request, err := message.Marshal()
+	if err != nil {
+		return err
+	}
+	fd, err := unix.Socket(unix.AF_ROUTE, unix.SOCK_RAW, 0)
+	if err != nil {
+		return err
+	}
+	defer unix.Close(fd)
+	if fib >= 0 {
+		if err := unix.SetsockoptInt(fd, unix.SOL_SOCKET, unix.SO_SETFIB, fib); err != nil {
+			return err
+		}
+	}
+	_, err = unix.Write(fd, request)
+	return err
+}
+
+func findOutboundInterface(tunIndex int, fixedName string) (*net.Interface, error) {
+	if fixedName != "" {
+		iface, err := net.InterfaceByName(fixedName)
+		if err != nil {
+			return nil, err
+		}
+		if iface.Index == tunIndex {
+			return nil, errors.New("outbound interface cannot be the TUN interface")
+		}
+		return iface, nil
+	}
+
+	physical, err := physicalDefaultRoutes(tunIndex, 0)
 	if err != nil {
 		return nil, err
 	}
-	if iface.Index == tunIndex {
-		return nil, errors.New("outbound interface cannot be the TUN interface")
+	for _, family := range []int{unix.AF_INET, unix.AF_INET6} {
+		for _, route := range physical {
+			if route.family == family {
+				return route.iface, nil
+			}
+		}
+	}
+	return nil, errors.New("default route not found")
+}
+
+// physicalRoute describes one physical default route: the interface it
+// leaves through, its gateway, and the connected prefix that makes the
+// gateway resolvable.
+type physicalRoute struct {
+	family    int
+	iface     *net.Interface
+	gateway   netip.Addr
+	connected netip.Prefix
+}
+
+// physicalDefaultRoutes scans the default routing table for default routes
+// that do not go through the TUN interface, at most one per address family
+// (the first usable one wins, matching the darwin implementation's
+// preference order). A non-zero onlyIndex restricts the scan to that
+// interface, for the fixed-name mode of autoOutboundsInterface.
+func physicalDefaultRoutes(tunIndex int, onlyIndex int) ([]physicalRoute, error) {
+	rib, err := route.FetchRIB(unix.AF_UNSPEC, route.RIBTypeRoute, 0)
+	if err != nil {
+		return nil, err
+	}
+	messages, err := route.ParseRIB(route.RIBTypeRoute, rib)
+	if err != nil {
+		return nil, err
+	}
+
+	found := make([]physicalRoute, 0, 2)
+	seen := make(map[int]bool)
+	for _, message := range messages {
+		routeMessage, ok := message.(*route.RouteMessage)
+		if !ok || routeMessage.Index == tunIndex {
+			continue
+		}
+		if onlyIndex != 0 && routeMessage.Index != onlyIndex {
+			continue
+		}
+		if routeMessage.Flags&unix.RTF_UP == 0 || routeMessage.Flags&unix.RTF_GATEWAY == 0 {
+			continue
+		}
+
+		family, ok := defaultRouteFamily(routeMessage)
+		if !ok || seen[family] {
+			continue
+		}
+		iface, err := usableInterface(routeMessage.Index)
+		if err != nil {
+			continue
+		}
+		gatewayAddr, ok := routeAddrToNetip(routeMessage.Addrs[unix.RTAX_GATEWAY])
+		if !ok {
+			continue
+		}
+		connected, err := connectedPrefix(iface, gatewayAddr)
+		if err != nil {
+			continue
+		}
+		seen[family] = true
+		found = append(found, physicalRoute{
+			family:    family,
+			iface:     iface,
+			gateway:   gatewayAddr,
+			connected: connected,
+		})
+	}
+
+	if len(found) == 0 {
+		return nil, errors.New("default route not found")
+	}
+	return found, nil
+}
+
+// defaultRouteFamily reports the address family of a RIB message that
+// represents a true default route (unspecified destination, zero mask).
+func defaultRouteFamily(message *route.RouteMessage) (int, bool) {
+	if len(message.Addrs) <= unix.RTAX_NETMASK {
+		return 0, false
+	}
+
+	switch destination := message.Addrs[unix.RTAX_DST].(type) {
+	case *route.Inet4Addr:
+		mask, ok := message.Addrs[unix.RTAX_NETMASK].(*route.Inet4Addr)
+		if !ok || destination.IP != netip.IPv4Unspecified().As4() {
+			return 0, false
+		}
+		ones, bits := net.IPMask(mask.IP[:]).Size()
+		return unix.AF_INET, ones == 0 && bits == 32
+	case *route.Inet6Addr:
+		mask, ok := message.Addrs[unix.RTAX_NETMASK].(*route.Inet6Addr)
+		if !ok || destination.IP != netip.IPv6Unspecified().As16() {
+			return 0, false
+		}
+		ones, bits := net.IPMask(mask.IP[:]).Size()
+		return unix.AF_INET6, ones == 0 && bits == 128
+	default:
+		return 0, false
+	}
+}
+
+func usableInterface(index int) (*net.Interface, error) {
+	iface, err := net.InterfaceByIndex(index)
+	if err != nil {
+		return nil, err
+	}
+	if iface.Flags&net.FlagUp == 0 || iface.Flags&net.FlagLoopback != 0 {
+		return nil, errors.New("default route interface is not usable")
 	}
 	return iface, nil
 }
+
+func routeAddrToNetip(addr route.Addr) (netip.Addr, bool) {
+	switch typed := addr.(type) {
+	case *route.Inet4Addr:
+		return netip.AddrFrom4(typed.IP), true
+	case *route.Inet6Addr:
+		return netip.AddrFrom16(typed.IP), true
+	default:
+		return netip.Addr{}, false
+	}
+}
+
+// checkEscapeFib verifies the system can host the escape routing table at
+// all: FIBs are a boot-time resource on FreeBSD.
+func checkEscapeFib() error {
+	fibs, err := unix.SysctlUint32("net.fibs")
+	if err != nil {
+		return xerrors.New("failed to read net.fibs").Base(err)
+	}
+	if fibs < 2 {
+		return errors.New("automatic outbound interface on FreeBSD needs a second routing table: add net.fibs=2 to /boot/loader.conf and reboot")
+	}
+	current, err := unix.SysctlUint32("net.my_fibnum")
+	if err != nil {
+		return xerrors.New("failed to read net.my_fibnum").Base(err)
+	}
+	if current == escapeFib {
+		return errors.New("xray runs inside routing table 1, which is reserved as the escape table; start it in another FIB")
+	}
+	return nil
+}
+
+// syncEscapeFib mirrors the physical default routes (and the connected
+// prefixes their gateways resolve through) into the escape FIB, replacing
+// whatever mirror a previous call installed. On discovery failure the old
+// mirror is kept, since a stale escape route beats none during a transient
+// route flap.
+func (t *FreeBSDTun) syncEscapeFib() error {
+	var onlyIndex int
+	if t.options.AutoOutboundsInterface != "" && updater != nil {
+		if iface := updater.Get(); iface != nil {
+			onlyIndex = iface.Index
+		}
+	}
+	physical, err := physicalDefaultRoutes(t.tunIndex, onlyIndex)
+	if err != nil {
+		return err
+	}
+
+	desired := make([]escapeRoute, 0, 2*len(physical))
+	for _, p := range physical {
+		desired = append(desired,
+			escapeRoute{prefix: p.connected, ifIndex: p.iface.Index},
+			escapeRoute{prefix: defaultPrefix(p.family), ifIndex: p.iface.Index, gateway: p.gateway},
+		)
+	}
+
+	t.escapeMu.Lock()
+	defer t.escapeMu.Unlock()
+
+	// The route monitor hears our own escape FIB writes too; rewriting an
+	// unchanged mirror on every wake-up would ping-pong forever.
+	if slices.Equal(t.escapeRoutes, desired) {
+		return nil
+	}
+
+	t.unsetEscapeFibLocked()
+	for _, entry := range desired {
+		err := execRoute(escapeFib, unix.RTM_ADD, entry.ifIndex, entry.prefix, entry.gateway)
+		if err != nil && !errors.Is(err, unix.EEXIST) {
+			return xerrors.New("failed to add escape route ", entry.prefix).Base(err)
+		}
+		t.escapeRoutes = append(t.escapeRoutes, entry)
+	}
+	return nil
+}
+
+func (t *FreeBSDTun) unsetEscapeFib() {
+	t.escapeMu.Lock()
+	defer t.escapeMu.Unlock()
+	t.unsetEscapeFibLocked()
+}
+
+func (t *FreeBSDTun) unsetEscapeFibLocked() {
+	for i := len(t.escapeRoutes) - 1; i >= 0; i-- {
+		entry := t.escapeRoutes[i]
+		err := execRoute(escapeFib, unix.RTM_DELETE, entry.ifIndex, entry.prefix, entry.gateway)
+		if err != nil && !errors.Is(err, unix.ESRCH) {
+			xerrors.LogInfoInner(context.Background(), err, "[tun] failed to delete escape route ", entry.prefix)
+		}
+	}
+	t.escapeRoutes = nil
+}
+
+func defaultPrefix(family int) netip.Prefix {
+	if family == unix.AF_INET {
+		return netip.PrefixFrom(netip.IPv4Unspecified(), 0)
+	}
+	return netip.PrefixFrom(netip.IPv6Unspecified(), 0)
+}
+
+// connectedPrefix finds the interface's address prefix containing the
+// gateway, which the escape FIB needs as an interface route so the mirrored
+// default route's gateway is resolvable there.
+func connectedPrefix(iface *net.Interface, gateway netip.Addr) (netip.Prefix, error) {
+	addrs, err := iface.Addrs()
+	if err != nil {
+		return netip.Prefix{}, err
+	}
+	for _, addr := range addrs {
+		ipNet, ok := addr.(*net.IPNet)
+		if !ok {
+			continue
+		}
+		ip, ok := netip.AddrFromSlice(ipNet.IP)
+		if !ok {
+			continue
+		}
+		ip = ip.Unmap()
+		ones, _ := ipNet.Mask.Size()
+		prefix := netip.PrefixFrom(ip, ones).Masked()
+		if prefix.Contains(gateway.WithZone("").Unmap()) {
+			return prefix, nil
+		}
+	}
+	return netip.Prefix{}, errors.New("no connected prefix contains the gateway")
+}