2019-12-08 04:17:24 +00:00
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package outbound
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2018-08-12 05:50:54 +00:00
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import (
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2019-10-12 15:55:39 +00:00
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"context"
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2018-10-28 11:46:49 +00:00
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"crypto/tls"
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2020-03-02 15:47:23 +00:00
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"errors"
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2018-08-12 05:50:54 +00:00
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"fmt"
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2022-07-11 04:37:27 +00:00
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tlsC "github.com/Dreamacro/clash/component/tls"
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2019-07-25 09:47:39 +00:00
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"io"
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"net"
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2018-11-04 13:12:16 +00:00
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"strconv"
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2018-08-12 05:50:54 +00:00
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2020-02-09 09:02:48 +00:00
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"github.com/Dreamacro/clash/component/dialer"
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2018-08-12 05:50:54 +00:00
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C "github.com/Dreamacro/clash/constant"
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2021-05-13 14:18:49 +00:00
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"github.com/Dreamacro/clash/transport/socks5"
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2018-08-12 05:50:54 +00:00
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)
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type Socks5 struct {
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*Base
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user string
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pass 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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2022-04-22 10:55:28 +00:00
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2018-10-02 07:26:36 +00:00
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type Socks5Option struct {
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BasicOption
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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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UserName string `proxy:"username,omitempty"`
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Password string `proxy:"password,omitempty"`
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TLS bool `proxy:"tls,omitempty"`
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UDP bool `proxy:"udp,omitempty"`
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SkipCertVerify bool `proxy:"skip-cert-verify,omitempty"`
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Fingerprint string `proxy:"fingerprint,omitempty"`
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2018-10-02 07:26:36 +00:00
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}
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2021-04-29 03:23:14 +00:00
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// StreamConn implements C.ProxyAdapter
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2020-03-21 15:46:49 +00:00
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func (ss *Socks5) StreamConn(c net.Conn, metadata *C.Metadata) (net.Conn, error) {
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if ss.tls {
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cc := tls.Client(c, ss.tlsConfig)
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ctx, cancel := context.WithTimeout(context.Background(), C.DefaultTLSTimeout)
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defer cancel()
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err := cc.HandshakeContext(ctx)
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c = cc
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if err != nil {
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return nil, fmt.Errorf("%s connect error: %w", ss.addr, err)
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}
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}
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var user *socks5.User
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if ss.user != "" {
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user = &socks5.User{
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Username: ss.user,
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Password: ss.pass,
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}
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}
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if _, err := socks5.ClientHandshake(c, serializesSocksAddr(metadata), socks5.CmdConnect, user); err != nil {
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return nil, err
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}
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return c, nil
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}
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2021-04-29 03:23:14 +00:00
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// DialContext implements C.ProxyAdapter
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func (ss *Socks5) DialContext(ctx context.Context, metadata *C.Metadata, opts ...dialer.Option) (_ C.Conn, err error) {
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c, err := dialer.DialContext(ctx, "tcp", ss.addr, ss.Base.DialOptions(opts...)...)
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if err != nil {
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return nil, fmt.Errorf("%s connect error: %w", ss.addr, err)
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}
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tcpKeepAlive(c)
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2022-12-13 05:20:40 +00:00
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defer func() {
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safeConnClose(c, err)
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}()
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2020-03-21 15:46:49 +00:00
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c, err = ss.StreamConn(c, metadata)
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if err != nil {
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return nil, err
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}
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return NewConn(c, ss), nil
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}
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2021-10-15 13:44:53 +00:00
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// ListenPacketContext implements C.ProxyAdapter
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func (ss *Socks5) ListenPacketContext(ctx context.Context, metadata *C.Metadata, opts ...dialer.Option) (_ C.PacketConn, err error) {
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c, err := dialer.DialContext(ctx, "tcp", ss.addr, ss.Base.DialOptions(opts...)...)
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if err != nil {
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2019-12-05 09:51:21 +00:00
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err = fmt.Errorf("%s connect error: %w", ss.addr, err)
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return
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}
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if ss.tls {
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cc := tls.Client(c, ss.tlsConfig)
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ctx, cancel := context.WithTimeout(context.Background(), C.DefaultTLSTimeout)
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defer cancel()
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err = cc.HandshakeContext(ctx)
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c = cc
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}
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2022-12-13 05:20:40 +00:00
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defer func() {
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safeConnClose(c, err)
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}()
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2019-04-25 05:48:47 +00:00
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tcpKeepAlive(c)
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var user *socks5.User
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if ss.user != "" {
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user = &socks5.User{
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Username: ss.user,
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Password: ss.pass,
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}
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}
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2019-07-25 09:47:39 +00:00
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bindAddr, err := socks5.ClientHandshake(c, serializesSocksAddr(metadata), socks5.CmdUDPAssociate, user)
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if err != nil {
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err = fmt.Errorf("client hanshake error: %w", err)
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return
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}
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2020-12-31 10:58:03 +00:00
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// Support unspecified UDP bind address.
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bindUDPAddr := bindAddr.UDPAddr()
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if bindUDPAddr == nil {
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err = errors.New("invalid UDP bind address")
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return
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} else if bindUDPAddr.IP.IsUnspecified() {
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serverAddr, err := resolveUDPAddr(ctx, "udp", ss.Addr())
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if err != nil {
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return nil, err
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}
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bindUDPAddr.IP = serverAddr.IP
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}
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2022-12-13 03:18:32 +00:00
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pc, err := dialer.ListenPacket(ctx, dialer.ParseNetwork("udp", bindUDPAddr.AddrPort().Addr()), "", ss.Base.DialOptions(opts...)...)
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if err != nil {
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return
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}
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go func() {
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io.Copy(io.Discard, c)
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c.Close()
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// A UDP association terminates when the TCP connection that the UDP
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// ASSOCIATE request arrived on terminates. RFC1928
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pc.Close()
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}()
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2020-12-31 10:58:03 +00:00
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return newPacketConn(&socksPacketConn{PacketConn: pc, rAddr: bindUDPAddr, tcpConn: c}, ss), nil
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}
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2022-07-11 05:42:28 +00:00
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func NewSocks5(option Socks5Option) (*Socks5, error) {
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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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ServerName: option.Server,
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}
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2022-07-11 05:42:28 +00:00
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if len(option.Fingerprint) == 0 {
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tlsConfig = tlsC.GetGlobalFingerprintTLCConfig(tlsConfig)
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} else {
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var err error
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if tlsConfig, err = tlsC.GetSpecifiedFingerprintTLSConfig(tlsConfig, option.Fingerprint); err != nil {
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return nil, err
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}
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}
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2018-11-01 03:54:45 +00:00
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}
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2018-08-12 05:50:54 +00:00
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return &Socks5{
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Base: &Base{
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name: option.Name,
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addr: net.JoinHostPort(option.Server, strconv.Itoa(option.Port)),
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tp: C.Socks5,
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udp: option.UDP,
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iface: option.Interface,
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rmark: option.RoutingMark,
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prefer: C.NewDNSPrefer(option.IPVersion),
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2018-12-22 15:56:42 +00:00
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},
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user: option.UserName,
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pass: option.Password,
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2018-10-29 12:16:43 +00:00
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tls: option.TLS,
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skipCertVerify: option.SkipCertVerify,
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tlsConfig: tlsConfig,
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}, nil
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2018-08-12 05:50:54 +00:00
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}
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2019-07-25 09:47:39 +00:00
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2020-02-17 09:34:19 +00:00
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type socksPacketConn struct {
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2019-07-25 09:47:39 +00:00
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net.PacketConn
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2020-01-31 06:43:54 +00:00
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rAddr net.Addr
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2019-08-12 06:01:32 +00:00
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tcpConn net.Conn
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}
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2020-02-17 09:34:19 +00:00
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func (uc *socksPacketConn) WriteTo(b []byte, addr net.Addr) (n int, err error) {
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2020-01-31 06:43:54 +00:00
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packet, err := socks5.EncodeUDPPacket(socks5.ParseAddrToSocksAddr(addr), b)
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if err != nil {
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return
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}
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return uc.PacketConn.WriteTo(packet, uc.rAddr)
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2019-07-25 09:47:39 +00:00
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}
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2020-02-17 09:34:19 +00:00
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func (uc *socksPacketConn) ReadFrom(b []byte) (int, net.Addr, error) {
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2020-02-29 17:46:02 +00:00
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n, _, e := uc.PacketConn.ReadFrom(b)
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2019-10-11 12:11:18 +00:00
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if e != nil {
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return 0, nil, e
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}
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2019-07-25 09:47:39 +00:00
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addr, payload, err := socks5.DecodeUDPPacket(b)
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if err != nil {
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return 0, nil, err
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}
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2020-03-02 15:47:23 +00:00
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udpAddr := addr.UDPAddr()
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if udpAddr == nil {
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return 0, nil, errors.New("parse udp addr error")
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}
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2019-10-11 12:11:18 +00:00
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// due to DecodeUDPPacket is mutable, record addr length
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copy(b, payload)
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2020-03-02 15:47:23 +00:00
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return n - len(addr) - 3, udpAddr, nil
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2019-07-25 09:47:39 +00:00
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}
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2019-08-12 06:01:32 +00:00
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2020-02-17 09:34:19 +00:00
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func (uc *socksPacketConn) Close() error {
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2019-08-12 06:01:32 +00:00
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uc.tcpConn.Close()
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return uc.PacketConn.Close()
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}
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