init

go-gost/x/handler/http/udp.go

@@ -0,0 +1,85 @@
+package http
+
+import (
+	"bytes"
+	"context"
+	"errors"
+	"net"
+	"net/http"
+	"net/http/httputil"
+	"time"
+
+	"github.com/go-gost/core/logger"
+	ctxvalue "github.com/go-gost/x/ctx"
+	"github.com/go-gost/x/internal/net/udp"
+	"github.com/go-gost/x/internal/util/socks"
+	xrecorder "github.com/go-gost/x/recorder"
+)
+
+func (h *httpHandler) handleUDP(ctx context.Context, conn net.Conn, ro *xrecorder.HandlerRecorderObject, log logger.Logger) error {
+	log = log.WithFields(map[string]any{
+		"cmd": "udp",
+	})
+
+	resp := &http.Response{
+		ProtoMajor: 1,
+		ProtoMinor: 1,
+		Header:     h.md.header,
+	}
+	if resp.Header == nil {
+		resp.Header = http.Header{}
+	}
+
+	if !h.md.enableUDP {
+		resp.StatusCode = http.StatusForbidden
+
+		if log.IsLevelEnabled(logger.TraceLevel) {
+			dump, _ := httputil.DumpResponse(resp, false)
+			log.Trace(string(dump))
+		}
+
+		log.Error("http: UDP relay is disabled")
+
+		return resp.Write(conn)
+	}
+
+	resp.StatusCode = http.StatusOK
+	if log.IsLevelEnabled(logger.TraceLevel) {
+		dump, _ := httputil.DumpResponse(resp, false)
+		log.Trace(string(dump))
+	}
+	if err := resp.Write(conn); err != nil {
+		log.Error(err)
+		return err
+	}
+
+	// obtain a udp connection
+	var buf bytes.Buffer
+	c, err := h.options.Router.Dial(ctxvalue.ContextWithBuffer(ctx, &buf), "udp", "") // UDP association
+	ro.Route = buf.String()
+	if err != nil {
+		log.Error(err)
+		return err
+	}
+	defer c.Close()
+
+	pc, ok := c.(net.PacketConn)
+	if !ok {
+		err = errors.New("wrong connection type")
+		log.Error(err)
+		return err
+	}
+
+	relay := udp.NewRelay(socks.UDPTunServerConn(conn), pc).
+		WithBypass(h.options.Bypass).
+		WithLogger(log)
+
+	t := time.Now()
+	log.Infof("%s <-> %s", conn.RemoteAddr(), pc.LocalAddr())
+	relay.Run(ctx)
+	log.WithFields(map[string]any{
+		"duration": time.Since(t),
+	}).Infof("%s >-< %s", conn.RemoteAddr(), pc.LocalAddr())
+
+	return nil
+}