add socks5 support

common/proxy.go

@@ -0,0 +1,65 @@
+package common
+
+import (
+	"errors"
+	"golang.org/x/net/proxy"
+	"net"
+	"net/url"
+	"strings"
+	"time"
+)
+
+func WrapperTcpWithTimeout(network, address string, timeout time.Duration) (net.Conn, error) {
+	d := &net.Dialer{Timeout: timeout/2}
+	return WrapperTCP(network, address, d)
+}
+
+func WrapperTCP(network, address string,forward * net.Dialer) (net.Conn, error) {
+	//get conn
+	var conn net.Conn
+	if Socks5Proxy == "" {
+		var err error
+		conn,err = forward.Dial(network, address)
+		if err != nil {
+			return nil, err
+		}
+	}else {
+		dailer, err := Socks5Dailer(forward)
+		if err != nil{
+			return nil, err
+		}
+		conn,err = dailer.Dial(network, address)
+		if err != nil {
+			return nil, err
+		}
+	}
+	return conn, nil
+
+}
+
+func Socks5Dailer(forward * net.Dialer) (proxy.Dialer, error) {
+	u,err := url.Parse(Socks5Proxy)
+	if err != nil {
+		return nil, err
+	}
+	if strings.ToLower(u.Scheme) != "socks5" {
+		return nil, errors.New("Only support socks5")
+	}
+	address := u.Host
+	var auth proxy.Auth
+	var dailer proxy.Dialer
+	if u.User.String() != "" {
+		auth = proxy.Auth{}
+		auth.User = u.User.Username()
+		password,_ := u.User.Password()
+		auth.Password = password
+		dailer, err = proxy.SOCKS5("tcp", address, &auth, forward)
+	}else {
+		dailer, err = proxy.SOCKS5("tcp", address, nil, forward)
+	}
+
+	if err != nil {
+		return nil, err
+	}
+	return dailer, nil
+}