Get Local IP of a device in chrome extension

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I am working on a chrome extension which is supposed to discover and then communicate with other devices in a local network. To discover them it needs to find out its own IP

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4条回答

故里飘歌

2020-12-24 03:36

After some searching I've found that similar question was answered before. This API is inaccessible from extension, but available for chrome apps:

use chrome.system.network.getNetworkInterfaces.

This will return an array of all interfaces with their IP address.

This is my sample code:

chrome.system.network.getNetworkInterfaces(function(interfaces){ console.log(interfaces); });

manifest-permissions:

"permissions": [ "system.network" ], ...

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臣服心动

2020-12-24 03:43

see http://developer.chrome.com/extensions/webRequest.html for detail, my code example:

// get IP using webRequest
var currentIPList = {};
chrome.webRequest.onCompleted.addListener(
  function(info) {
    currentIPList[info.url] = info.ip;
    currentIPList[info.tabId] = currentIPList[info.tabId] || [];
    currentIPList[info.tabId].push(info);
    return;
  },
  {
    urls: [],
    types: []
  },
  []
);

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故里飘歌

2020-12-24 03:48

You can get a list of your local IP addresses (more precisely: The IP addresses of your local network interfaces) via the WebRTC API. This API can be used by any web application (not just Chrome extensions).

Example:

// Example (using the function below).
getLocalIPs(function(ips) { // <!-- ips is an array of local IP addresses.
    document.body.textContent = 'Local IP addresses:\n ' + ips.join('\n ');
});

function getLocalIPs(callback) {
    var ips = [];

    var RTCPeerConnection = window.RTCPeerConnection ||
        window.webkitRTCPeerConnection || window.mozRTCPeerConnection;

    var pc = new RTCPeerConnection({
        // Don't specify any stun/turn servers, otherwise you will
        // also find your public IP addresses.
        iceServers: []
    });
    // Add a media line, this is needed to activate candidate gathering.
    pc.createDataChannel('');
    
    // onicecandidate is triggered whenever a candidate has been found.
    pc.onicecandidate = function(e) {
        if (!e.candidate) { // Candidate gathering completed.
            pc.close();
            callback(ips);
            return;
        }
        var ip = /^candidate:.+ (\S+) \d+ typ/.exec(e.candidate.candidate)[1];
        if (ips.indexOf(ip) == -1) // avoid duplicate entries (tcp/udp)
            ips.push(ip);
    };
    pc.createOffer(function(sdp) {
        pc.setLocalDescription(sdp);
    }, function onerror() {});
}

<body style="white-space:pre"> IP addresses will be printed here... </body>

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傲寒

2020-12-24 03:53
```
> chrome.system.network.getNetworkInterfaces(function(interfaces){
>       console.log(interfaces);    }); 
```
manifest-permissions:

"permissions": [ "system.network" ], ...

Works for me too and it replies:
```
(4) [{…}, {…}, {…}, {…}]
```
0 : {address: "xxxx", name: "en0", prefixLength: 64}

1 : {address: "192.168.86.100", name: "en0", prefixLength: 24}

2 : {address: "xxxx", name: "awdl0", prefixLength: 64}

3 : {address: "xxxx", name: "utun0", prefixLength: 64}

length : 4
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