117 lines
2.5 KiB
Go
117 lines
2.5 KiB
Go
package v5
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import (
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"context"
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"fmt"
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"net"
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"net/url"
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"strconv"
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"time"
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"github.com/go-gost/gosocks4"
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"github.com/go-gost/gost/pkg/connector"
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"github.com/go-gost/gost/pkg/logger"
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md "github.com/go-gost/gost/pkg/metadata"
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"github.com/go-gost/gost/pkg/registry"
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)
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func init() {
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registry.RegiserConnector("socks4", NewConnector)
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registry.RegiserConnector("socks4a", NewConnector)
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}
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type socks4Connector struct {
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md metadata
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logger logger.Logger
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}
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func NewConnector(opts ...connector.Option) connector.Connector {
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options := &connector.Options{}
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for _, opt := range opts {
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opt(options)
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}
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return &socks4Connector{
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logger: options.Logger,
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}
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}
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func (c *socks4Connector) Init(md md.Metadata) (err error) {
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return c.parseMetadata(md)
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}
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func (c *socks4Connector) Connect(ctx context.Context, conn net.Conn, network, address string, opts ...connector.ConnectOption) (net.Conn, error) {
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c.logger = c.logger.WithFields(map[string]interface{}{
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"remote": conn.RemoteAddr().String(),
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"local": conn.LocalAddr().String(),
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"target": address,
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})
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c.logger.Infof("connect: ", address)
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var addr *gosocks4.Addr
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if c.md.disable4a {
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taddr, err := net.ResolveTCPAddr("tcp4", address)
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if err != nil {
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c.logger.Error("resolve: ", err)
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return nil, err
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}
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if len(taddr.IP) == 0 {
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taddr.IP = net.IPv4zero
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}
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addr = &gosocks4.Addr{
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Type: gosocks4.AddrIPv4,
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Host: taddr.IP.String(),
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Port: uint16(taddr.Port),
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}
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} else {
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host, port, err := net.SplitHostPort(address)
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if err != nil {
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return nil, err
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}
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p, _ := strconv.Atoi(port)
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addr = &gosocks4.Addr{
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Type: gosocks4.AddrDomain,
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Host: host,
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Port: uint16(p),
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}
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}
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conn.SetDeadline(time.Now().Add(c.md.connectTimeout))
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defer conn.SetDeadline(time.Time{})
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req := gosocks4.NewRequest(gosocks4.CmdConnect, addr, nil)
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if err := req.Write(conn); err != nil {
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c.logger.Error(err)
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return nil, err
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}
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if c.logger.IsLevelEnabled(logger.DebugLevel) {
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c.logger.Debug(req)
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}
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reply, err := gosocks4.ReadReply(conn)
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if err != nil {
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c.logger.Error(err)
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return nil, err
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}
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if c.logger.IsLevelEnabled(logger.DebugLevel) {
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c.logger.Debug(reply)
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}
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if reply.Code != gosocks4.Granted {
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return nil, fmt.Errorf("error: %d", reply.Code)
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}
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return conn, nil
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}
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func (c *socks4Connector) parseMetadata(md md.Metadata) (err error) {
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if v := md.GetString(auth); v != "" {
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c.md.User = url.User(v)
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}
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c.md.connectTimeout = md.GetDuration(connectTimeout)
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c.md.disable4a = md.GetBool(disable4a)
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return
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}
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