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Handle different types of local networks. #1

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Handle different types of local networks. #1

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40 changes: 38 additions & 2 deletions 2019/05/26/i-can-see-your-local-web-servers/index.html
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Original file line number Diff line number Diff line change
Expand Up @@ -159,14 +159,50 @@ <h1>I can see your local web servers
})
}

function extractLocalNetworkPrefix(candidate) {
if (!candidate)
return null;

// Class A
var candidatePrefix = /(^10\.[0-9]{1,3}\.[0-9]{1,3}\.)[0-9]{1,3}/.exec(candidate);
if (candidatePrefix && candidatePrefix.length > 1)
return candidatePrefix[1];

// Class B
candidatePrefix = /(^172\.1[6-9]\.[0-9]{1,3}\.)[0-9]{1,3}/.exec(candidate);
if (candidatePrefix && candidatePrefix.length > 1)
return candidatePrefix[1];

candidatePrefix = /(^172\.2[0-9]\.[0-9]{1,3}\.)[0-9]{1,3}/.exec(candidate);
if (candidatePrefix && candidatePrefix.length > 1)
return candidatePrefix[1];

var candidatePrefix = /(^172\.3[0-1]\.[0-9]{1,3}\.)[0-9]/.exec(candidate);
if (candidatePrefix && candidatePrefix.length > 1)
return candidatePrefix[1];

// Class C
var candidatePrefix = /(^192\.168\.[0-9]{1,3}\.)[0-9]{1,3}/.exec(candidate);
if (candidatePrefix && candidatePrefix.length > 1)
return candidatePrefix[1];

return null;
}

function getLocalNetworkPrefix(cb) {
var RTCPeerConnection = window.RTCPeerConnection || webkitRTCPeerConnection || mozRTCPeerConnection;
var peerConn = new RTCPeerConnection({'iceServers': [{'urls': ['stun:stun.l.google.com:19302']}]});
var dataChannel = peerConn.createDataChannel('test'); // Needs something added for some reason
peerConn.createOffer({}).then((desc) => peerConn.setLocalDescription(desc));
peerConn.onicecandidate = (e) => {
if (e.candidate == null) {
cb(/(192\.168\.[0-9]+\.)[0-9]+/.exec(peerConn.localDescription.sdp)[1]);
if (!e.candidate) {
var prefix = extractLocalNetworkPrefix(peerConn.localDescription.sdp);
if (prefix)
cb(prefix);
} else if (e.candidate.address) {
var prefix = extractLocalNetworkPrefix(e.candidate.address);
if (prefix)
cb(prefix);
}
};
}
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