New: custom socks5 proxy support

adapters/remote/socks5.go

@@ -0,0 +1,91 @@
+package adapters
+
+import (
+	"bytes"
+	"errors"
+	"fmt"
+	"io"
+	"net"
+
+	C "github.com/Dreamacro/clash/constant"
+
+	"github.com/riobard/go-shadowsocks2/socks"
+)
+
+// Socks5Adapter is a shadowsocks adapter
+type Socks5Adapter struct {
+	conn net.Conn
+}
+
+// Close is used to close connection
+func (ss *Socks5Adapter) Close() {
+	ss.conn.Close()
+}
+
+func (ss *Socks5Adapter) Conn() net.Conn {
+	return ss.conn
+}
+
+type Socks5 struct {
+	addr string
+	name string
+}
+
+func (ss *Socks5) Name() string {
+	return ss.name
+}
+
+func (ss *Socks5) Type() C.AdapterType {
+	return C.Socks5
+}
+
+func (ss *Socks5) Generator(addr *C.Addr) (adapter C.ProxyAdapter, err error) {
+	c, err := net.Dial("tcp", ss.addr)
+	if err != nil {
+		return nil, fmt.Errorf("%s connect error", ss.addr)
+	}
+	c.(*net.TCPConn).SetKeepAlive(true)
+
+	if err := ss.sharkHand(addr, c); err != nil {
+		return nil, err
+	}
+	return &Socks5Adapter{conn: c}, nil
+}
+
+func (ss *Socks5) sharkHand(addr *C.Addr, rw io.ReadWriter) error {
+	buf := make([]byte, socks.MaxAddrLen)
+
+	// VER, CMD, RSV
+	_, err := rw.Write([]byte{5, 1, 0})
+	if err != nil {
+		return err
+	}
+
+	if _, err := io.ReadFull(rw, buf[:2]); err != nil {
+		return err
+	}
+
+	if buf[0] != 5 {
+		return errors.New("SOCKS version error")
+	} else if buf[1] != 0 {
+		return errors.New("SOCKS need auth")
+	}
+
+	// VER, CMD, RSV, ADDR
+	if _, err := rw.Write(bytes.Join([][]byte{[]byte{5, 1, 0}, serializesSocksAddr(addr)}, []byte(""))); err != nil {
+		return err
+	}
+
+	if _, err := io.ReadFull(rw, buf[:10]); err != nil {
+		return err
+	}
+
+	return nil
+}
+
+func NewSocks5(name, addr string) *Socks5 {
+	return &Socks5{
+		addr: addr,
+		name: name,
+	}
+}