133 lines
3.4 KiB
Go
133 lines
3.4 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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"github.com/go-gost/core/connector"
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"github.com/go-gost/core/logger"
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"github.com/go-gost/gosocks5"
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"github.com/go-gost/x/internal/net/udp"
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"github.com/go-gost/x/internal/util/mux"
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"github.com/go-gost/x/internal/util/socks"
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)
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// Bind implements connector.Binder.
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func (c *socks5Connector) Bind(ctx context.Context, conn net.Conn, network, address string, opts ...connector.BindOption) (net.Listener, error) {
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log := c.options.Logger.WithFields(map[string]any{
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"remote": conn.RemoteAddr().String(),
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"local": conn.LocalAddr().String(),
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"network": network,
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"address": address,
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})
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log.Debugf("bind on %s/%s", address, network)
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options := connector.BindOptions{}
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for _, opt := range opts {
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opt(&options)
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}
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switch network {
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case "tcp", "tcp4", "tcp6":
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if options.Mux {
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return c.muxBindTCP(ctx, conn, network, address, log)
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}
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return c.bindTCP(ctx, conn, network, address, log)
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case "udp", "udp4", "udp6":
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return c.bindUDP(ctx, conn, network, address, &options, log)
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default:
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err := fmt.Errorf("network %s is unsupported", network)
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log.Error(err)
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return nil, err
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}
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}
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func (c *socks5Connector) bindTCP(ctx context.Context, conn net.Conn, network, address string, log logger.Logger) (net.Listener, error) {
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laddr, err := c.bind(conn, gosocks5.CmdBind, network, address, log)
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if err != nil {
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return nil, err
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}
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return &tcpListener{
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addr: laddr,
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conn: conn,
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logger: log,
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}, nil
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}
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func (c *socks5Connector) muxBindTCP(ctx context.Context, conn net.Conn, network, address string, log logger.Logger) (net.Listener, error) {
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laddr, err := c.bind(conn, socks.CmdMuxBind, network, address, log)
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if err != nil {
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return nil, err
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}
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session, err := mux.ServerSession(conn, c.md.muxCfg)
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if err != nil {
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return nil, err
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}
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return &tcpMuxListener{
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addr: laddr,
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session: session,
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logger: log,
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}, nil
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}
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func (c *socks5Connector) bindUDP(ctx context.Context, conn net.Conn, network, address string, opts *connector.BindOptions, log logger.Logger) (net.Listener, error) {
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laddr, err := c.bind(conn, socks.CmdUDPTun, network, address, log)
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if err != nil {
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return nil, err
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}
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ln := udp.NewListener(socks.UDPTunClientPacketConn(conn),
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&udp.ListenConfig{
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Addr: laddr,
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Backlog: opts.Backlog,
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ReadQueueSize: opts.UDPDataQueueSize,
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ReadBufferSize: opts.UDPDataBufferSize,
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TTL: opts.UDPConnTTL,
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KeepAlive: true,
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Logger: log,
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})
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return ln, nil
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}
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func (l *socks5Connector) bind(conn net.Conn, cmd uint8, network, address string, log logger.Logger) (net.Addr, error) {
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addr := gosocks5.Addr{}
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addr.ParseFrom(address)
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req := gosocks5.NewRequest(cmd, &addr)
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log.Trace(req)
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if err := req.Write(conn); err != nil {
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return nil, err
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}
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// first reply, bind status
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reply, err := gosocks5.ReadReply(conn)
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if err != nil {
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return nil, err
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}
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log.Trace(reply)
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if reply.Rep != gosocks5.Succeeded {
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return nil, fmt.Errorf("bind on %s/%s failed", address, network)
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}
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var baddr net.Addr
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switch network {
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case "tcp", "tcp4", "tcp6":
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baddr, err = net.ResolveTCPAddr(network, reply.Addr.String())
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case "udp", "udp4", "udp6":
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baddr, err = net.ResolveUDPAddr(network, reply.Addr.String())
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default:
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err = fmt.Errorf("unknown network %s", network)
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}
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if err != nil {
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return nil, err
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}
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log.Debugf("bind on %s/%s OK", baddr, baddr.Network())
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return baddr, nil
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}
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