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124 lines
2.5 KiB
Go
124 lines
2.5 KiB
Go
package adapters
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import (
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"bytes"
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"crypto/tls"
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"errors"
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"fmt"
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"io"
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"net"
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"strconv"
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C "github.com/Dreamacro/clash/constant"
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"github.com/Dreamacro/go-shadowsocks2/socks"
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)
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// Socks5Adapter is a shadowsocks adapter
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type Socks5Adapter struct {
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conn net.Conn
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}
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// Close is used to close connection
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func (ss *Socks5Adapter) Close() {
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ss.conn.Close()
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}
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func (ss *Socks5Adapter) Conn() net.Conn {
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return ss.conn
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}
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type Socks5 struct {
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addr string
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name string
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tls bool
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skipCertVerify bool
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tlsConfig *tls.Config
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}
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type Socks5Option struct {
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Name string `proxy:"name"`
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Server string `proxy:"server"`
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Port int `proxy:"port"`
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TLS bool `proxy:"tls,omitempty"`
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SkipCertVerify bool `proxy:"skip-cert-verify,omitempty"`
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}
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func (ss *Socks5) Name() string {
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return ss.name
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}
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func (ss *Socks5) Type() C.AdapterType {
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return C.Socks5
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}
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func (ss *Socks5) Generator(metadata *C.Metadata) (adapter C.ProxyAdapter, err error) {
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c, err := net.DialTimeout("tcp", ss.addr, tcpTimeout)
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if err == nil && ss.tls {
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cc := tls.Client(c, ss.tlsConfig)
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err = cc.Handshake()
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c = cc
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}
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if err != nil {
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return nil, fmt.Errorf("%s connect error", ss.addr)
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}
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tcpKeepAlive(c)
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if err := ss.shakeHand(metadata, c); err != nil {
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return nil, err
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}
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return &Socks5Adapter{conn: c}, nil
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}
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func (ss *Socks5) shakeHand(metadata *C.Metadata, rw io.ReadWriter) error {
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buf := make([]byte, socks.MaxAddrLen)
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// VER, CMD, RSV
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_, err := rw.Write([]byte{5, 1, 0})
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if err != nil {
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return err
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}
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if _, err := io.ReadFull(rw, buf[:2]); err != nil {
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return err
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}
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if buf[0] != 5 {
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return errors.New("SOCKS version error")
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} else if buf[1] != 0 {
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return errors.New("SOCKS need auth")
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}
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// VER, CMD, RSV, ADDR
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if _, err := rw.Write(bytes.Join([][]byte{{5, 1, 0}, serializesSocksAddr(metadata)}, []byte(""))); err != nil {
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return err
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}
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if _, err := io.ReadFull(rw, buf[:10]); err != nil {
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return err
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}
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return nil
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}
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func NewSocks5(option Socks5Option) *Socks5 {
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var tlsConfig *tls.Config
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if option.TLS {
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tlsConfig = &tls.Config{
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InsecureSkipVerify: option.SkipCertVerify,
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ClientSessionCache: getClientSessionCache(),
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MinVersion: tls.VersionTLS11,
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MaxVersion: tls.VersionTLS12,
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ServerName: option.Server,
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}
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}
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return &Socks5{
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addr: net.JoinHostPort(option.Server, strconv.Itoa(option.Port)),
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name: option.Name,
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tls: option.TLS,
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skipCertVerify: option.SkipCertVerify,
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tlsConfig: tlsConfig,
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}
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}
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