Add PROXY Protocol support for freedom outbound

common/net/destination.go

@@ -97,6 +97,35 @@ func (d Destination) NetAddr() string {
 	return addr
 }
 
+// RawNetAddr converts a net.Addr from its Destination presentation.
+func (d Destination) RawNetAddr() net.Addr {
+	var addr net.Addr
+	switch d.Network {
+	case Network_TCP:
+		if d.Address.Family().IsIP() {
+			addr = &net.TCPAddr{
+				IP:   d.Address.IP(),
+				Port: int(d.Port),
+			}
+		}
+	case Network_UDP:
+		if d.Address.Family().IsIP() {
+			addr = &net.UDPAddr{
+				IP:   d.Address.IP(),
+				Port: int(d.Port),
+			}
+		}
+	case Network_UNIX:
+		if d.Address.Family().IsDomain() {
+			addr = &net.UnixAddr{
+				Name: d.Address.String(),
+				Net:  d.Network.SystemString(),
+			}
+		}
+	}
+	return addr
+}
+
 // String returns the strings form of this Destination.
 func (d Destination) String() string {
 	prefix := "unknown:"

infra/conf/freedom.go

@@ -17,6 +17,7 @@ type FreedomConfig struct {
 	Redirect       string    `json:"redirect"`
 	UserLevel      uint32    `json:"userLevel"`
 	Fragment       *Fragment `json:"fragment"`
+	ProxyProtocol  uint32    `json:"proxyProtocol"`
 }
 
 type Fragment struct {
@@ -165,5 +166,8 @@ func (c *FreedomConfig) Build() (proto.Message, error) {
 			config.DestinationOverride.Server.Address = v2net.NewIPOrDomain(v2net.ParseAddress(host))
 		}
 	}
+	if c.ProxyProtocol > 0 && c.ProxyProtocol <= 2 {
+		config.ProxyProtocol = c.ProxyProtocol
+	}
 	return config, nil
 }

proxy/freedom/config.pb.go

@@ -1,7 +1,7 @@
 // Code generated by protoc-gen-go. DO NOT EDIT.
 // versions:
-// 	protoc-gen-go v1.31.0
+// 	protoc-gen-go v1.32.0
-// 	protoc        v4.23.1
+// 	protoc        v4.25.2
 // source: proxy/freedom/config.proto
 
 package freedom
@@ -239,6 +239,7 @@ type Config struct {
 	DestinationOverride *DestinationOverride `protobuf:"bytes,3,opt,name=destination_override,json=destinationOverride,proto3" json:"destination_override,omitempty"`
 	UserLevel           uint32               `protobuf:"varint,4,opt,name=user_level,json=userLevel,proto3" json:"user_level,omitempty"`
 	Fragment            *Fragment            `protobuf:"bytes,5,opt,name=fragment,proto3" json:"fragment,omitempty"`
+	ProxyProtocol       uint32               `protobuf:"varint,6,opt,name=proxy_protocol,json=proxyProtocol,proto3" json:"proxy_protocol,omitempty"`
 }
 
 func (x *Config) Reset() {
@@ -309,6 +310,13 @@ func (x *Config) GetFragment() *Fragment {
 	return nil
 }
 
+func (x *Config) GetProxyProtocol() uint32 {
+	if x != nil {
+		return x.ProxyProtocol
+	}
+	return 0
+}
+
 var File_proxy_freedom_config_proto protoreflect.FileDescriptor
 
 var file_proxy_freedom_config_proto_rawDesc = []byte{
@@ -335,7 +343,7 @@ var file_proxy_freedom_config_proto_rawDesc = []byte{
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@@ -354,24 +362,27 @@ var file_proxy_freedom_config_proto_rawDesc = []byte{
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 }
 
 var (

proxy/freedom/config.proto

@@ -40,4 +40,5 @@ message Config {
   DestinationOverride destination_override = 3;
   uint32 user_level = 4;
   Fragment fragment = 5;
+  uint32 proxy_protocol = 6;
 }

proxy/freedom/freedom.go

@@ -9,6 +9,7 @@ import (
 	"math/big"
 	"time"
 
+	"github.com/pires/go-proxyproto"
 	"github.com/xtls/xray-core/common"
 	"github.com/xtls/xray-core/common/buf"
 	"github.com/xtls/xray-core/common/dice"
@@ -152,6 +153,18 @@ func (h *Handler) Process(ctx context.Context, link *transport.Link, dialer inte
 		if err != nil {
 			return err
 		}
+
+		if h.config.ProxyProtocol > 0 && h.config.ProxyProtocol <= 2 {
+			version := byte(h.config.ProxyProtocol)
+			srcAddr := inbound.Source.RawNetAddr()
+			dstAddr := rawConn.RemoteAddr()
+			header := proxyproto.HeaderProxyFromAddrs(version, srcAddr, dstAddr)
+			if _, err = header.WriteTo(rawConn); err != nil {
+				rawConn.Close()
+				return err
+			}
+		}
+
 		conn = rawConn
 		return nil
 	})