116 lines
2.6 KiB
Go
116 lines
2.6 KiB
Go
package relay
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import (
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"context"
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"errors"
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"fmt"
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"net"
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"time"
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"github.com/go-gost/core/limiter/traffic"
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"github.com/go-gost/core/logger"
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"github.com/go-gost/core/observer/stats"
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"github.com/go-gost/relay"
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ctxvalue "github.com/go-gost/x/ctx"
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netpkg "github.com/go-gost/x/internal/net"
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"github.com/go-gost/x/limiter/traffic/wrapper"
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stats_wrapper "github.com/go-gost/x/observer/stats/wrapper"
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)
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func (h *relayHandler) handleForward(ctx context.Context, conn net.Conn, network string, log logger.Logger) error {
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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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target := h.hop.Select(ctx)
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if target == nil {
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resp.Status = relay.StatusServiceUnavailable
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resp.WriteTo(conn)
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err := errors.New("target not available")
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log.Error(err)
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return err
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}
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log = log.WithFields(map[string]any{
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"dst": fmt.Sprintf("%s/%s", target.Addr, network),
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"cmd": "forward",
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})
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log.Debugf("%s >> %s", conn.RemoteAddr(), target.Addr)
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cc, err := h.router.Dial(ctx, network, target.Addr)
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if err != nil {
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// TODO: the router itself may be failed due to the failed node in the router,
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// the dead marker may be a wrong operation.
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if marker := target.Marker(); marker != nil {
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marker.Mark()
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}
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resp.Status = relay.StatusHostUnreachable
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resp.WriteTo(conn)
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log.Error(err)
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return err
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}
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defer cc.Close()
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if marker := target.Marker(); marker != nil {
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marker.Reset()
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}
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if h.md.noDelay {
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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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}
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switch network {
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case "udp", "udp4", "udp6":
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rc := &udpConn{
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Conn: conn,
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}
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if !h.md.noDelay {
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// cache the header
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if _, err := resp.WriteTo(&rc.wbuf); err != nil {
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return err
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}
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}
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conn = rc
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default:
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rc := &tcpConn{
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Conn: conn,
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}
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if !h.md.noDelay {
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// cache the header
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if _, err := resp.WriteTo(&rc.wbuf); err != nil {
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return err
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}
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}
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conn = rc
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}
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clientID := ctxvalue.ClientIDFromContext(ctx)
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rw := wrapper.WrapReadWriter(h.options.Limiter, conn,
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traffic.NetworkOption(network),
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traffic.AddrOption(target.Addr),
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traffic.ClientOption(string(clientID)),
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traffic.SrcOption(conn.RemoteAddr().String()),
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)
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if h.options.Observer != nil {
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pstats := h.stats.Stats(string(clientID))
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pstats.Add(stats.KindTotalConns, 1)
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pstats.Add(stats.KindCurrentConns, 1)
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defer pstats.Add(stats.KindCurrentConns, -1)
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rw = stats_wrapper.WrapReadWriter(rw, pstats)
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}
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t := time.Now()
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log.Debugf("%s <-> %s", conn.RemoteAddr(), target.Addr)
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netpkg.Transport(rw, 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(), target.Addr)
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return nil
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}
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