128 lines
2.6 KiB
Go
128 lines
2.6 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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"time"
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"github.com/go-gost/gost/v3/pkg/connector"
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md "github.com/go-gost/gost/v3/pkg/metadata"
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"github.com/go-gost/gost/v3/pkg/registry"
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"github.com/go-gost/relay"
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relay_util "github.com/go-gost/x/internal/util/relay"
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)
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func init() {
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registry.ConnectorRegistry().Register("relay", NewConnector)
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}
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type relayConnector struct {
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md metadata
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options connector.Options
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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 &relayConnector{
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options: options,
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}
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}
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func (c *relayConnector) Init(md md.Metadata) (err error) {
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return c.parseMetadata(md)
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}
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func (c *relayConnector) Connect(ctx context.Context, conn net.Conn, network, address string, opts ...connector.ConnectOption) (net.Conn, 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.Infof("connect %s/%s", address, network)
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if c.md.connectTimeout > 0 {
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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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}
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req := relay.Request{
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Version: relay.Version1,
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Flags: relay.CONNECT,
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}
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if network == "udp" || network == "udp4" || network == "udp6" {
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req.Flags |= relay.FUDP
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// UDP association
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if address == "" {
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baddr, 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("associate on %s OK", baddr)
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return relay_util.UDPTunClientConn(conn, nil), nil
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}
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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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if address != "" {
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af := &relay.AddrFeature{}
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if err := af.ParseFrom(address); err != nil {
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return nil, err
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}
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// forward mode if port is 0.
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if af.Port > 0 {
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req.Features = append(req.Features, af)
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}
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}
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if c.md.noDelay {
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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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}
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switch network {
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case "tcp", "tcp4", "tcp6":
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cc := &tcpConn{
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Conn: conn,
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}
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if !c.md.noDelay {
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if _, err := req.WriteTo(&cc.wbuf); err != nil {
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return nil, err
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}
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}
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conn = cc
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case "udp", "udp4", "udp6":
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cc := &udpConn{
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Conn: conn,
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}
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if !c.md.noDelay {
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if _, err := req.WriteTo(&cc.wbuf); err != nil {
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return nil, err
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}
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}
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conn = cc
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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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return conn, nil
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}
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