実行結果

# go run webrtc/main.go
2020/01/06 23:31:08 Local IP Address: 192.168.xxx.xxx
2020/01/06 23:31:08 Public IP Address: 113.xxx.xxx.xxx

実装

main.go

package main

import (
  "log"
  "os"

  "github.com/pion/webrtc/v2"
)

func main() {
  config := webrtc.Configuration{
    ICEServers: []webrtc.ICEServer{
      {
        URLs: []string{"stun:stun.l.google.com:19302"},
      },
    },
  }

  // generate a new connection
  peerConnection, err := webrtc.NewPeerConnection(config)
  if err != nil {
    log.Fatal(err)
  }

  peerConnection.OnICECandidate(func(c *webrtc.ICECandidate) {
    if c == nil {
      os.Exit(0)
    }
    switch c.Typ {
    case webrtc.ICECandidateTypeHost:
      log.Println("Local IP Address:", c.Address)
    case webrtc.ICECandidateTypeSrflx:
      log.Println("Public IP Address:", c.Address)
    }
  })

  if _, err := peerConnection.CreateDataChannel("", nil); err != nil {
    log.Fatal(err)
  }

  offer, err := peerConnection.CreateOffer(nil)
  if err != nil {
    log.Fatal(err)
  }

  if err = peerConnection.SetLocalDescription(offer); err != nil {
    log.Fatal(err)
  }

  // block forever
  select {}
}