Sockopt: Allow `customSockopt` work for Windows & Darwin (#4576)

* Sockopt: Add custom sockopt on Windows & Darwin

* fix windows udp by the way

* use resolved addr

https://github.com/XTLS/Xray-core/pull/4504#issuecomment-2769153797

infra/conf/transport_internet.go

@@ -691,6 +691,7 @@ func (p TransportProtocol) Build() (string, error) {
 }
 
 type CustomSockoptConfig struct {
+	Syetem  string `json:"system"`
 	Network string `json:"network"`
 	Level   string `json:"level"`
 	Opt     string `json:"opt"`
@@ -778,6 +779,7 @@ func (c *SocketConfig) Build() (*internet.SocketConfig, error) {
 
 	for _, copt := range c.CustomSockopt {
 		customSockopt := &internet.CustomSockopt{
+			System:  copt.Syetem,
 			Network: copt.Network,
 			Level:   copt.Level,
 			Opt:     copt.Opt,

transport/internet/config.pb.go

@@ -417,11 +417,12 @@ type CustomSockopt struct {
 	sizeCache     protoimpl.SizeCache
 	unknownFields protoimpl.UnknownFields
 
-	Network string `protobuf:"bytes,1,opt,name=network,proto3" json:"network,omitempty"`
-	Level   string `protobuf:"bytes,2,opt,name=level,proto3" json:"level,omitempty"`
-	Opt     string `protobuf:"bytes,3,opt,name=opt,proto3" json:"opt,omitempty"`
-	Value   string `protobuf:"bytes,4,opt,name=value,proto3" json:"value,omitempty"`
-	Type    string `protobuf:"bytes,5,opt,name=type,proto3" json:"type,omitempty"`
+	System  string `protobuf:"bytes,1,opt,name=system,proto3" json:"system,omitempty"`
+	Network string `protobuf:"bytes,2,opt,name=network,proto3" json:"network,omitempty"`
+	Level   string `protobuf:"bytes,3,opt,name=level,proto3" json:"level,omitempty"`
+	Opt     string `protobuf:"bytes,4,opt,name=opt,proto3" json:"opt,omitempty"`
+	Value   string `protobuf:"bytes,5,opt,name=value,proto3" json:"value,omitempty"`
+	Type    string `protobuf:"bytes,6,opt,name=type,proto3" json:"type,omitempty"`
 }
 
 func (x *CustomSockopt) Reset() {
@@ -454,6 +455,13 @@ func (*CustomSockopt) Descriptor() ([]byte, []int) {
 	return file_transport_internet_config_proto_rawDescGZIP(), []int{3}
 }
 
+func (x *CustomSockopt) GetSystem() string {
+	if x != nil {
+		return x.System
+	}
+	return ""
+}
+
 func (x *CustomSockopt) GetNetwork() string {
 	if x != nil {
 		return x.Network
@@ -748,107 +756,108 @@ var file_transport_internet_config_proto_rawDesc = []byte{
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 }
 
 var (

transport/internet/config.proto

@@ -65,11 +65,12 @@ message ProxyConfig {
 }
 
 message CustomSockopt {
-  string network = 1;
-  string level = 2;
-  string opt = 3;
-  string value = 4;
-  string type = 5;
+  string system = 1;
+  string network = 2;
+  string level = 3;
+  string opt = 4;
+  string value = 5;
+  string type = 6;
 }
 
 // SocketConfig is options to be applied on network sockets.

transport/internet/sockopt_darwin.go

@@ -1,8 +1,12 @@
 package internet
 
 import (
+	"context"
 	gonet "net"
 	"os"
+	"runtime"
+	"strconv"
+	"strings"
 	"syscall"
 	"unsafe"
 
@@ -147,6 +151,44 @@ func applyOutboundSocketOptions(network string, address string, fd uintptr, conf
 		}
 	}
 
+	if len(config.CustomSockopt) > 0 {
+		for _, custom := range config.CustomSockopt {
+			if custom.System != "" && custom.System != runtime.GOOS {
+				errors.LogDebug(context.Background(), "CustomSockopt system not match: ", "want ", custom.System, " got ", runtime.GOOS)
+				continue
+			}
+			// Skip unwanted network type
+			// network might be tcp4 or tcp6
+			// use HasPrefix so that "tcp" can match tcp4/6 with "tcp" if user want to control all tcp (udp is also the same)
+			// if it is empty, strings.HasPrefix will always return true to make it apply for all networks
+			if !strings.HasPrefix(network, custom.Network) {
+				continue
+			}
+			var level = 0x6 // default TCP
+			var opt int
+			if len(custom.Opt) == 0 {
+				return errors.New("No opt!")
+			} else {
+				opt, _ = strconv.Atoi(custom.Opt)
+			}
+			if custom.Level != "" {
+				level, _ = strconv.Atoi(custom.Level)
+			}
+			if custom.Type == "int" {
+				value, _ := strconv.Atoi(custom.Value)
+				if err := syscall.SetsockoptInt(int(fd), level, opt, value); err != nil {
+					return errors.New("failed to set CustomSockoptInt", opt, value, err)
+				}
+			} else if custom.Type == "str" {
+				if err := syscall.SetsockoptString(int(fd), level, opt, custom.Value); err != nil {
+					return errors.New("failed to set CustomSockoptString", opt, custom.Value, err)
+				}
+			} else {
+				return errors.New("unknown CustomSockopt type:", custom.Type)
+			}
+		}
+	}
+
 	return nil
 }
 
@@ -206,6 +248,44 @@ func applyInboundSocketOptions(network string, fd uintptr, config *SocketConfig)
 		}
 	}
 
+	if len(config.CustomSockopt) > 0 {
+		for _, custom := range config.CustomSockopt {
+			if custom.System != "" && custom.System != runtime.GOOS {
+				errors.LogDebug(context.Background(), "CustomSockopt system not match: ", "want ", custom.System, " got ", runtime.GOOS)
+				continue
+			}
+			// Skip unwanted network type
+			// network might be tcp4 or tcp6
+			// use HasPrefix so that "tcp" can match tcp4/6 with "tcp" if user want to control all tcp (udp is also the same)
+			// if it is empty, strings.HasPrefix will always return true to make it apply for all networks
+			if !strings.HasPrefix(network, custom.Network) {
+				continue
+			}
+			var level = 0x6 // default TCP
+			var opt int
+			if len(custom.Opt) == 0 {
+				return errors.New("No opt!")
+			} else {
+				opt, _ = strconv.Atoi(custom.Opt)
+			}
+			if custom.Level != "" {
+				level, _ = strconv.Atoi(custom.Level)
+			}
+			if custom.Type == "int" {
+				value, _ := strconv.Atoi(custom.Value)
+				if err := syscall.SetsockoptInt(int(fd), level, opt, value); err != nil {
+					return errors.New("failed to set CustomSockoptInt", opt, value, err)
+				}
+			} else if custom.Type == "str" {
+				if err := syscall.SetsockoptString(int(fd), level, opt, custom.Value); err != nil {
+					return errors.New("failed to set CustomSockoptString", opt, custom.Value, err)
+				}
+			} else {
+				return errors.New("unknown CustomSockopt type:", custom.Type)
+			}
+		}
+	}
+
 	return nil
 }
 

transport/internet/sockopt_linux.go

@@ -1,7 +1,9 @@
 package internet
 
 import (
+	"context"
 	"net"
+	"runtime"
 	"strconv"
 	"strings"
 	"syscall"
@@ -110,11 +112,15 @@ func applyOutboundSocketOptions(network string, address string, fd uintptr, conf
 
 	if len(config.CustomSockopt) > 0 {
 		for _, custom := range config.CustomSockopt {
+			if custom.System != "" && custom.System != runtime.GOOS{
+				errors.LogDebug(context.Background(), "CustomSockopt system not match: ", "want ", custom.System, " got ", runtime.GOOS)
+				continue
+			}
 			// Skip unwanted network type
 			// network might be tcp4 or tcp6
 			// use HasPrefix so that "tcp" can match tcp4/6 with "tcp" if user want to control all tcp (udp is also the same)
 			// if it is empty, strings.HasPrefix will always return true to make it apply for all networks
-			if !strings.HasPrefix(network, custom.Network) {
+			if !strings.HasPrefix(network, custom.Network){
 				continue
 			}
 			var level = 0x6 // default TCP
@@ -212,6 +218,17 @@ func applyInboundSocketOptions(network string, fd uintptr, config *SocketConfig)
 		}
 		if len(config.CustomSockopt) > 0 {
 			for _, custom := range config.CustomSockopt {
+				if custom.System != "" && custom.System != runtime.GOOS{
+					errors.LogDebug(context.Background(), "CustomSockopt system not match: ", "want ", custom.System, " got ", runtime.GOOS)
+					continue
+				}
+				// Skip unwanted network type
+				// network might be tcp4 or tcp6
+				// use HasPrefix so that "tcp" can match tcp4/6 with "tcp" if user want to control all tcp (udp is also the same)
+				// if it is empty, strings.HasPrefix will always return true to make it apply for all networks
+				if !strings.HasPrefix(network, custom.Network){
+					continue
+				}
 				var level = 0x6 // default TCP
 				var opt int
 				if len(custom.Opt) == 0 {

transport/internet/sockopt_windows.go

@@ -1,8 +1,12 @@
 package internet
 
 import (
+	"context"
 	"encoding/binary"
 	"net"
+	"runtime"
+	"strconv"
+	"strings"
 	"syscall"
 	"unsafe"
 
@@ -33,7 +37,10 @@ func applyOutboundSocketOptions(network string, address string, fd uintptr, conf
 		if err != nil {
 			return errors.New("failed to find the interface").Base(err)
 		}
-		isV4 := (network == "tcp4" || network == "udp4")
+		// easy way to check if the address is ipv4
+		isV4 := strings.Contains(address, ".")
+		// note: DO NOT trust the passed network variable, it can be udp6 even if the address is ipv4
+		// because operating system might(always) use ipv6 socket to process ipv4
 		if isV4 {
 			var bytes [4]byte
 			binary.BigEndian.PutUint32(bytes[:], uint32(inf.Index))
@@ -69,6 +76,42 @@ func applyOutboundSocketOptions(network string, address string, fd uintptr, conf
 		}
 	}
 
+	if len(config.CustomSockopt) > 0 {
+		for _, custom := range config.CustomSockopt {
+			if custom.System != "" && custom.System != runtime.GOOS {
+				errors.LogDebug(context.Background(), "CustomSockopt system not match: ", "want ", custom.System, " got ", runtime.GOOS)
+				continue
+			}
+			// Skip unwanted network type
+			// network might be tcp4 or tcp6
+			// use HasPrefix so that "tcp" can match tcp4/6 with "tcp" if user want to control all tcp (udp is also the same)
+			// if it is empty, strings.HasPrefix will always return true to make it apply for all networks
+			if !strings.HasPrefix(network, custom.Network) {
+				continue
+			}
+			var level = 0x6 // default TCP
+			var opt int
+			if len(custom.Opt) == 0 {
+				return errors.New("No opt!")
+			} else {
+				opt, _ = strconv.Atoi(custom.Opt)
+			}
+			if custom.Level != "" {
+				level, _ = strconv.Atoi(custom.Level)
+			}
+			if custom.Type == "int" {
+				value, _ := strconv.Atoi(custom.Value)
+				if err := syscall.SetsockoptInt(syscall.Handle(fd), level, opt, value); err != nil {
+					return errors.New("failed to set CustomSockoptInt", opt, value, err)
+				}
+			} else if custom.Type == "str" {
+				return errors.New("failed to set CustomSockoptString: Str type does not supported on windows")
+			} else {
+				return errors.New("unknown CustomSockopt type:", custom.Type)
+			}
+		}
+	}
+
 	return nil
 }
 
@@ -94,6 +137,42 @@ func applyInboundSocketOptions(network string, fd uintptr, config *SocketConfig)
 		}
 	}
 
+	if len(config.CustomSockopt) > 0 {
+		for _, custom := range config.CustomSockopt {
+			if custom.System != "" && custom.System != runtime.GOOS {
+				errors.LogDebug(context.Background(), "CustomSockopt system not match: ", "want ", custom.System, " got ", runtime.GOOS)
+				continue
+			}
+			// Skip unwanted network type
+			// network might be tcp4 or tcp6
+			// use HasPrefix so that "tcp" can match tcp4/6 with "tcp" if user want to control all tcp (udp is also the same)
+			// if it is empty, strings.HasPrefix will always return true to make it apply for all networks
+			if !strings.HasPrefix(network, custom.Network) {
+				continue
+			}
+			var level = 0x6 // default TCP
+			var opt int
+			if len(custom.Opt) == 0 {
+				return errors.New("No opt!")
+			} else {
+				opt, _ = strconv.Atoi(custom.Opt)
+			}
+			if custom.Level != "" {
+				level, _ = strconv.Atoi(custom.Level)
+			}
+			if custom.Type == "int" {
+				value, _ := strconv.Atoi(custom.Value)
+				if err := syscall.SetsockoptInt(syscall.Handle(fd), level, opt, value); err != nil {
+					return errors.New("failed to set CustomSockoptInt", opt, value, err)
+				}
+			} else if custom.Type == "str" {
+				return errors.New("failed to set CustomSockoptString: Str type does not supported on windows")
+			} else {
+				return errors.New("unknown CustomSockopt type:", custom.Type)
+			}
+		}
+	}
+
 	return nil
 }
 

transport/internet/system_dialer.go

@@ -60,6 +60,10 @@ func (d *DefaultSystemDialer) Dial(ctx context.Context, src net.Address, dest ne
 			}
 		}
 		var lc net.ListenConfig
+		destAddr, err := net.ResolveUDPAddr("udp", dest.NetAddr())
+		if err != nil {
+			return nil, err
+		}
 		lc.Control = func(network, address string, c syscall.RawConn) error {
 			for _, ctl := range d.controllers {
 				if err := ctl(network, address, c); err != nil {
@@ -68,7 +72,7 @@ func (d *DefaultSystemDialer) Dial(ctx context.Context, src net.Address, dest ne
 			}
 			return c.Control(func(fd uintptr) {
 				if sockopt != nil {
-					if err := applyOutboundSocketOptions(network, "", fd, sockopt); err != nil {
+					if err := applyOutboundSocketOptions(network, destAddr.String(), fd, sockopt); err != nil {
 						errors.LogInfo(ctx, err, "failed to apply socket options")
 					}
 				}
@@ -78,10 +82,6 @@ func (d *DefaultSystemDialer) Dial(ctx context.Context, src net.Address, dest ne
 		if err != nil {
 			return nil, err
 		}
-		destAddr, err := net.ResolveUDPAddr("udp", dest.NetAddr())
-		if err != nil {
-			return nil, err
-		}
 		return &PacketConnWrapper{
 			Conn: packetConn,
 			Dest: destAddr,