114 lines
2.4 KiB
Go
114 lines
2.4 KiB
Go
package tunnel
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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/core/connector"
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md "github.com/go-gost/core/metadata"
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"github.com/go-gost/relay"
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ctxvalue "github.com/go-gost/x/internal/ctx"
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"github.com/go-gost/x/registry"
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)
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func init() {
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registry.ConnectorRegistry().Register("tunnel", NewConnector)
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}
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type tunnelConnector 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 &tunnelConnector{
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options: options,
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}
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}
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func (c *tunnelConnector) Init(md md.Metadata) (err error) {
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return c.parseMetadata(md)
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}
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func (c *tunnelConnector) 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.Debugf("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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Cmd: relay.CmdConnect,
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}
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switch network {
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case "udp", "udp4", "udp6":
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req.Cmd |= relay.FUDP
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req.Features = append(req.Features, &relay.NetworkFeature{
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Network: relay.NetworkUDP,
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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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srcAddr := conn.LocalAddr().String()
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if v := ctxvalue.ClientAddrFromContext(ctx); v != "" {
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srcAddr = string(v)
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}
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af := &relay.AddrFeature{}
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af.ParseFrom(srcAddr)
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req.Features = append(req.Features, af) // src address
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af = &relay.AddrFeature{}
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af.ParseFrom(address)
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req.Features = append(req.Features, af) // dst address
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req.Features = append(req.Features, &relay.TunnelFeature{
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ID: c.md.tunnelID,
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})
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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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// drain the response
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if err := readResponse(conn); err != nil {
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return nil, err
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}
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switch network {
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case "tcp", "tcp4", "tcp6":
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case "udp", "udp4", "udp6":
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conn = &udpConn{
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Conn: conn,
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}
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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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