Get local and public IP addresses in JavaScript

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from:https://github.com/diafygi/webrtc-ips


Firefox 跟 Chrome支持WebRTC可以向STUN服务器请求，返回内外网IP，不同于XMLHttpRequest请求，STUN请求开发者工具当中看不到网络请求的。

1. //get the IP addresses associated with an account
   
2. function getIPs(callback){
   
3.     var ip_dups = {};
   
4. 
   
5.     //compatibility for firefox and chrome
   
6.     var RTCPeerConnection = window.RTCPeerConnection
   
7.         || window.mozRTCPeerConnection
   
8.         || window.webkitRTCPeerConnection;
   
9.     var mediaConstraints = {
   
10.         optional: [{RtpDataChannels: true}]
    
11.     };
    
12. 
    
13.     //firefox already has a default stun server in about:config
    
14.     //    media.peerconnection.default_iceservers =
    
15.     //    [{"url": "stun:stun.services.mozilla.com"}]
    
16.     var servers = undefined;
    
17. 
    
18.     //add same stun server for chrome
    
19.     if(window.webkitRTCPeerConnection)
    
20.         servers = {iceServers: [{urls: "stun:stun.services.mozilla.com"}]};
    
21. 
    
22.     //construct a new RTCPeerConnection
    
23.     var pc = new RTCPeerConnection(servers, mediaConstraints);
    
24. 
    
25.     //listen for candidate events
    
26.     pc.onicecandidate = function(ice){
    
27. 
    
28.         //skip non-candidate events
    
29.         if(ice.candidate){
    
30. 
    
31.             //match just the IP address
    
32.             var ip_regex = /([0-9]{1,3}(\.[0-9]{1,3}){3})/
    
33.             var ip_addr = ip_regex.exec(ice.candidate.candidate)[1];
    
34. 
    
35.             //remove duplicates
    
36.             if(ip_dups[ip_addr] === undefined)
    
37.                 callback(ip_addr);
    
38. 
    
39.             ip_dups[ip_addr] = true;
    
40.         }
    
41.     };
    
42. 
    
43.     //create a bogus data channel
    
44.     pc.createDataChannel("");
    
45. 
    
46.     //create an offer sdp
    
47.     pc.createOffer(function(result){
    
48. 
    
49.         //trigger the stun server request
    
50.         pc.setLocalDescription(result, function(){}, function(){});
    
51. 
    
52.     }, function(){});
    
53. }
    
54. 
    
55. //Test: Print the IP addresses into the console
    
56. getIPs(function(ip){console.log(ip);});

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测试页面：https://diafygi.github.io/webrtc-ips/