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Improve the response to UDP Associate in Socks5

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RPRX 2021-01-09 16:36:20 +00:00 committed by GitHub
parent 7427a55ef1
commit 700966508f
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2 changed files with 11 additions and 14 deletions
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11
proxy/socks/protocol.go
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@ -42,7 +42,7 @@ type ServerSession struct {
config *ServerConfig
address net.Address
port net.Port
clientAddress net.Address
localAddress net.Address
}
func (s *ServerSession) handshake4(cmd byte, reader io.Reader, writer io.Writer) (*protocol.RequestHeader, error) {
@ -192,14 +192,11 @@ func (s *ServerSession) handshake5(nMethod byte, reader io.Reader, writer io.Wri
//nolint:gocritic // Use if else chain for clarity
if request.Command == protocol.RequestCommandUDP {
if s.config.Address != nil {
// Use configured IP as remote address in the response to UdpAssociate
// Use configured IP as remote address in the response to UDP Associate
responseAddress = s.config.Address.AsAddress()
} else if s.clientAddress == net.LocalHostIP || s.clientAddress == net.LocalHostIPv6 {
// For localhost clients use loopback IP
responseAddress = s.clientAddress
} else {
// For non-localhost clients use inbound listening address
responseAddress = s.address
// Use conn.LocalAddr() IP as remote address in the response by default
responseAddress = s.localAddress
}
}
if err := writeSocks5Response(writer, statusSuccess, responseAddress, responsePort); err != nil {

2
proxy/socks/server.go
View file

@ -92,7 +92,7 @@ func (s *Server) processTCP(ctx context.Context, conn internet.Connection, dispa
config: s.config,
address: inbound.Gateway.Address,
port: inbound.Gateway.Port,
clientAddress: inbound.Source.Address,
localAddress: net.IPAddress(conn.LocalAddr().(*net.TCPAddr).IP),
}
reader := &buf.BufferedReader{Reader: buf.NewReader(conn)}