custom tcp listener and connection object

proxy/shadowsocks/shadowsocks.go

@@ -3,18 +3,49 @@
 package shadowsocks
 
 import (
+	"github.com/v2ray/v2ray-core/common/log"
 	v2net "github.com/v2ray/v2ray-core/common/net"
+	"github.com/v2ray/v2ray-core/proxy"
+	"github.com/v2ray/v2ray-core/transport/listener"
 )
 
 type Shadowsocks struct {
-	config *Config
-	port   v2net.Port
+	config      *Config
+	port        v2net.Port
+	accepting   bool
+	tcpListener *listener.TCPListener
 }
 
 func (this *Shadowsocks) Port() v2net.Port {
 	return this.port
 }
 
+func (this *Shadowsocks) Close() {
+	this.accepting = false
+	this.tcpListener.Close()
+	this.tcpListener = nil
+}
+
 func (this *Shadowsocks) Listen(port v2net.Port) error {
+	if this.accepting {
+		if this.port == port {
+			return nil
+		} else {
+			return proxy.ErrorAlreadyListening
+		}
+	}
+
+	tcpListener, err := listener.ListenTCP(port, this.handleConnection)
+	if err != nil {
+		log.Error("Shadowsocks: Failed to listen on port ", port, ": ", err)
+		return err
+	}
+	this.tcpListener = tcpListener
+	this.accepting = true
 	return nil
 }
+
+func (this *Shadowsocks) handleConnection(conn *listener.TCPConn) {
+	defer conn.Close()
+
+}