udp_server.go 1.2 KB

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  1. /*
  2. Copyright 2014 The Kubernetes Authors.
  3. Licensed under the Apache License, Version 2.0 (the "License");
  4. you may not use this file except in compliance with the License.
  5. You may obtain a copy of the License at
  6. http://www.apache.org/licenses/LICENSE-2.0
  7. Unless required by applicable law or agreed to in writing, software
  8. distributed under the License is distributed on an "AS IS" BASIS,
  9. WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  10. See the License for the specific language governing permissions and
  11. limitations under the License.
  12. */
  13. package userspace
  14. import (
  15. "fmt"
  16. "net"
  17. )
  18. // udpEchoServer is a simple echo server in UDP, intended for testing the proxy.
  19. type udpEchoServer struct {
  20. net.PacketConn
  21. }
  22. func (r *udpEchoServer) Loop() {
  23. var buffer [4096]byte
  24. for {
  25. n, cliAddr, err := r.ReadFrom(buffer[0:])
  26. if err != nil {
  27. fmt.Printf("ReadFrom failed: %v\n", err)
  28. continue
  29. }
  30. r.WriteTo(buffer[0:n], cliAddr)
  31. }
  32. }
  33. func newUDPEchoServer() (*udpEchoServer, error) {
  34. packetconn, err := net.ListenPacket("udp", ":0")
  35. if err != nil {
  36. return nil, err
  37. }
  38. return &udpEchoServer{packetconn}, nil
  39. }
  40. /*
  41. func main() {
  42. r,_ := newUDPEchoServer()
  43. r.Loop()
  44. }
  45. */