read original addr from x-forwarded-for header if present

common/protocol/http/headers.go

@@ -0,0 +1,21 @@
+package http
+
+import (
+	"net/http"
+	"strings"
+
+	"v2ray.com/core/common/net"
+)
+
+func ParseXForwardedFor(header http.Header) []net.Address {
+	xff := header.Get("X-Forwarded-For")
+	if len(xff) == 0 {
+		return nil
+	}
+	list := strings.Split(xff, ",")
+	addrs := make([]net.Address, 0, len(list))
+	for _, proxy := range list {
+		addrs = append(addrs, net.ParseAddress(proxy))
+	}
+	return addrs
+}

common/protocol/http/headers_test.go

@@ -0,0 +1,20 @@
+package http_test
+
+import (
+	"net/http"
+	"testing"
+
+	. "v2ray.com/core/common/protocol/http"
+	. "v2ray.com/ext/assert"
+)
+
+func TestParseXForwardedFor(t *testing.T) {
+	assert := With(t)
+
+	header := http.Header{}
+	header.Add("X-Forwarded-For", "129.78.138.66, 129.78.64.103")
+	addrs := ParseXForwardedFor(header)
+	assert(len(addrs), Equals, 2)
+	assert(addrs[0].String(), Equals, "129.78.138.66")
+	assert(addrs[1].String(), Equals, "129.78.64.103")
+}

transport/internet/websocket/connection.go

@@ -16,15 +16,16 @@ var (
 
 // connection is a wrapper for net.Conn over WebSocket connection.
 type connection struct {
-	conn   *websocket.Conn
-	reader io.Reader
-
+	conn          *websocket.Conn
+	reader        io.Reader
 	mergingWriter *buf.BufferedWriter
+	remoteAddr    net.Addr
 }
 
-func newConnection(conn *websocket.Conn) *connection {
+func newConnection(conn *websocket.Conn, remoteAddr net.Addr) *connection {
 	return &connection{
-		conn: conn,
+		conn:       conn,
+		remoteAddr: remoteAddr,
 	}
 }
 
@@ -86,7 +87,7 @@ func (c *connection) LocalAddr() net.Addr {
 }
 
 func (c *connection) RemoteAddr() net.Addr {
-	return c.conn.RemoteAddr()
+	return c.remoteAddr
 }
 
 func (c *connection) SetDeadline(t time.Time) error {

transport/internet/websocket/dialer.go

@@ -62,5 +62,5 @@ func dialWebsocket(ctx context.Context, dest net.Destination) (net.Conn, error)
 		return nil, newError("failed to dial to (", uri, "): ", reason).Base(err)
 	}
 
-	return newConnection(conn), nil
+	return newConnection(conn, conn.RemoteAddr()), nil
 }

transport/internet/websocket/hub.go

@@ -12,6 +12,7 @@ import (
 	"v2ray.com/core/app/log"
 	"v2ray.com/core/common"
 	"v2ray.com/core/common/net"
+	http_proto "v2ray.com/core/common/protocol/http"
 	"v2ray.com/core/transport/internet"
 	v2tls "v2ray.com/core/transport/internet/tls"
 )
@@ -38,7 +39,13 @@ func (h *requestHandler) ServeHTTP(writer http.ResponseWriter, request *http.Req
 		return
 	}
 
-	h.ln.addConn(h.ln.ctx, newConnection(conn))
+	forwardedAddrs := http_proto.ParseXForwardedFor(request.Header)
+	remoteAddr := conn.RemoteAddr()
+	if len(forwardedAddrs) > 0 && forwardedAddrs[0].Family().Either(net.AddressFamilyIPv4, net.AddressFamilyIPv6) {
+		remoteAddr.(*net.TCPAddr).IP = forwardedAddrs[0].IP()
+	}
+
+	h.ln.addConn(h.ln.ctx, newConnection(conn, remoteAddr))
 }
 
 type Listener struct {

transport/internet/websocket/ws_test.go

@@ -59,15 +59,46 @@ func Test_listenWSAndDial(t *testing.T) {
 	assert(err, IsNil)
 	assert(string(b[:n]), Equals, "Response")
 	assert(conn.Close(), IsNil)
-	<-time.After(time.Second * 15)
-	conn, err = Dial(ctx, net.TCPDestination(net.DomainAddress("localhost"), 13146))
+
+	assert(listen.Close(), IsNil)
+}
+
+func TestDialWithRemoteAddr(t *testing.T) {
+	assert := With(t)
+	listen, err := ListenWS(internet.ContextWithTransportSettings(context.Background(), &Config{
+		Path: "ws",
+	}), net.DomainAddress("localhost"), 13146, func(ctx context.Context, conn internet.Connection) bool {
+		go func(c internet.Connection) {
+			defer c.Close()
+
+			assert(c.RemoteAddr().String(), HasPrefix, "1.1.1.1")
+
+			var b [1024]byte
+			n, err := c.Read(b[:])
+			//assert(err, IsNil)
+			if err != nil {
+				return
+			}
+			assert(bytes.HasPrefix(b[:n], []byte("Test connection")), IsTrue)
+
+			_, err = c.Write([]byte("Response"))
+			assert(err, IsNil)
+		}(conn)
+		return true
+	})
 	assert(err, IsNil)
-	_, err = conn.Write([]byte("Test connection 3"))
+
+	ctx := internet.ContextWithTransportSettings(context.Background(), &Config{Path: "ws", Header: []*Header{{Key: "X-Forwarded-For", Value: "1.1.1.1"}}})
+	conn, err := Dial(ctx, net.TCPDestination(net.DomainAddress("localhost"), 13146))
+
 	assert(err, IsNil)
-	n, err = conn.Read(b[:])
+	_, err = conn.Write([]byte("Test connection 1"))
+	assert(err, IsNil)
+
+	var b [1024]byte
+	n, err := conn.Read(b[:])
 	assert(err, IsNil)
 	assert(string(b[:n]), Equals, "Response")
-	assert(conn.Close(), IsNil)
 
 	assert(listen.Close(), IsNil)
 }