107 lines
2.4 KiB
Go
107 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/logger"
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"github.com/go-gost/relay"
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xnet "github.com/go-gost/x/internal/net"
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)
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func (h *tunnelHandler) handleConnect(ctx context.Context, req *relay.Request, conn net.Conn, network, srcAddr string, dstAddr string, tunnelID relay.TunnelID, log logger.Logger) error {
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log = log.WithFields(map[string]any{
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"dst": fmt.Sprintf("%s/%s", dstAddr, network),
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"cmd": "connect",
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"tunnel": tunnelID.String(),
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})
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resp := relay.Response{
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Version: relay.Version1,
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Status: relay.StatusOK,
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}
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if h.options.Bypass != nil && h.options.Bypass.Contains(ctx, network, dstAddr) {
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log.Debug("bypass: ", dstAddr)
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resp.Status = relay.StatusForbidden
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_, err := resp.WriteTo(conn)
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return err
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}
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host, _, _ := net.SplitHostPort(dstAddr)
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// client is a public entrypoint.
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if tunnelID.Equal(h.md.entryPointID) {
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resp.WriteTo(conn)
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return h.ep.handle(ctx, conn)
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}
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if !h.md.directTunnel {
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var tid relay.TunnelID
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if ingress := h.md.ingress; ingress != nil && host != "" {
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tid = parseTunnelID(ingress.Get(ctx, host))
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}
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if !tid.Equal(tunnelID) {
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resp.Status = relay.StatusHostUnreachable
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resp.WriteTo(conn)
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err := fmt.Errorf("no route to host %s", host)
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log.Error(err)
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return err
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}
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}
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d := Dialer{
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node: h.id,
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pool: h.pool,
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sd: h.md.sd,
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retry: 3,
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timeout: 15 * time.Second,
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log: log,
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}
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cc, node, cid, err := d.Dial(ctx, network, tunnelID.String())
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if err != nil {
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log.Error(err)
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resp.Status = relay.StatusServiceUnavailable
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resp.WriteTo(conn)
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return err
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}
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defer cc.Close()
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log.Debugf("new connection to tunnel: %s, connector: %s", tunnelID, cid)
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if node == h.id {
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if _, err := resp.WriteTo(conn); err != nil {
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log.Error(err)
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return err
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}
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resp = relay.Response{
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Version: relay.Version1,
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Status: relay.StatusOK,
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}
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af := &relay.AddrFeature{}
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af.ParseFrom(srcAddr)
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resp.Features = append(resp.Features, af) // src address
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af = &relay.AddrFeature{}
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af.ParseFrom(dstAddr)
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resp.Features = append(resp.Features, af) // dst address
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resp.WriteTo(cc)
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} else {
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req.WriteTo(cc)
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}
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t := time.Now()
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log.Debugf("%s <-> %s", conn.RemoteAddr(), cc.RemoteAddr())
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xnet.Transport(conn, cc)
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log.WithFields(map[string]any{
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"duration": time.Since(t),
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}).Debugf("%s >-< %s", conn.RemoteAddr(), cc.RemoteAddr())
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return nil
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}
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