134 lines
3.2 KiB
Go
134 lines
3.2 KiB
Go
package relay
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import (
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"context"
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"fmt"
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"net"
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"strconv"
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"github.com/go-gost/gost/v3/pkg/common/util/udp"
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"github.com/go-gost/gost/v3/pkg/connector"
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"github.com/go-gost/gost/v3/pkg/logger"
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"github.com/go-gost/relay"
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"github.com/go-gost/x/internal/util/mux"
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relay_util "github.com/go-gost/x/internal/util/relay"
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)
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// Bind implements connector.Binder.
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func (c *relayConnector) 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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"network": network,
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"address": address,
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})
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log.Infof("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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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 *relayConnector) 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, relay.BIND, network, address)
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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", laddr, laddr.Network())
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session, err := mux.ServerSession(conn)
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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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session: session,
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logger: log,
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}, nil
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}
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func (c *relayConnector) 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, relay.FUDP|relay.BIND, network, address)
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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", laddr, laddr.Network())
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ln := udp.NewListener(
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relay_util.UDPTunClientPacketConn(conn),
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laddr,
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opts.Backlog,
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opts.UDPDataQueueSize, opts.UDPDataBufferSize,
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opts.UDPConnTTL,
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log)
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return ln, nil
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}
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func (c *relayConnector) bind(conn net.Conn, cmd uint8, network, address string) (net.Addr, error) {
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req := relay.Request{
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Version: relay.Version1,
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Flags: cmd,
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}
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if c.options.Auth != nil {
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pwd, _ := c.options.Auth.Password()
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req.Features = append(req.Features, &relay.UserAuthFeature{
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Username: c.options.Auth.Username(),
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Password: pwd,
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})
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}
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fa := &relay.AddrFeature{}
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fa.ParseFrom(address)
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req.Features = append(req.Features, fa)
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if _, err := req.WriteTo(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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resp := relay.Response{}
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if _, err := resp.ReadFrom(conn); err != nil {
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return nil, err
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}
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if resp.Status != relay.StatusOK {
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return nil, fmt.Errorf("bind on %s/%s failed", address, network)
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}
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var addr string
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for _, f := range resp.Features {
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if f.Type() == relay.FeatureAddr {
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if fa, ok := f.(*relay.AddrFeature); ok {
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addr = net.JoinHostPort(fa.Host, strconv.Itoa(int(fa.Port)))
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}
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}
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}
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var baddr net.Addr
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var err error
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switch network {
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case "tcp", "tcp4", "tcp6":
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baddr, err = net.ResolveTCPAddr(network, addr)
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case "udp", "udp4", "udp6":
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baddr, err = net.ResolveUDPAddr(network, addr)
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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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return baddr, nil
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}
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