Il y a quelques jours, j’ai mis en place une page qui permet de récupérer son IP publique, y compris derrière certains proxy / firewall / VPN grâce à la faille WebRTC.
Voici donc le code rien que pour vous 
Si vous avez des idées pour l’améliorer, n’hésitez pas !
$ipaddress = $_SERVER['REMOTE_ADDR']; //ip address
$host = gethostbyaddr($ipaddress);
if (!empty($_SERVER['HTTP_CLIENT_IP'])) //check ip from share internet
{
$realip=$_SERVER['HTTP_CLIENT_IP'];
}
elseif (!empty($_SERVER['HTTP_X_FORWARDED_FOR'])) //to check ip is pass from proxy
{
$realip=$_SERVER['HTTP_X_FORWARDED_FOR'];
}
else
{
$realip=$_SERVER['REMOTE_ADDR'];
}
//echo "$ipaddress;$realip;$host;";
$locationstr="http://ip-api.com/xml/";
$locationstr = $locationstr.$ipaddress;
//loading the xml file directly from the website
$xml = simplexml_load_file($locationstr);
$countrycode = $xml->countryCode; //country code
$countryname = $xml->country; //country name
$region = $xml->regionName; //region name
$city = $xml->city; //city name
$lattitude = $xml->lat; //city latitude
$longitude = $xml->lon; //city longitude
$isp = $xml->isp; //city latitude
$noeud = $xml->as; //city longitude
//$browsername = $xml->browserName; //browser name
?>
<div class="main" style="width:950px;">
<h2 class="post-title">Voici votre adresse IP locale : <b><?php //echo $ipaddress; ?></b></h2>
<h2 class="post-title">Voici votre adresse IP publique : <b><?php //echo $ipaddress; ?></b></h2>
<h2 class="post-title">Voici votre nom d'hôte : <b><?php echo $host; ?></b></h2>
Cette adresse a été localisée dans la belle ville de <b><?php echo $city ?></b> (Région : <?php echo $region ?> / Pays : <?php echo $countryname ?>)
<br/>(Localisation effectuée en fonction de votre FAI (<b><?php echo $isp; ?></b>) et du noeud réseau auquel vous êtes rattaché (<b><?php echo $noeud; ?></b>))
<p>
<center>
<iframe width="900" height="550"frameborder="0" style="border:0" src="https://www.google.com/maps/embed/v1/place?key=AIzaSyCRTD-ARSWquI_i1P0AlZrRPxnzmtIntd4&q=<?php echo $lattitude?>,<?php echo $longitude?>&zoom=12" allowfullscreen>
</iframe></center>
</p>
Passez une excellente journée.
<iframe id="iframe" sandbox="allow-same-origin" style="display: none"></iframe>
<script>
//get the IP addresses associated with an account
function getIPs(callback){
var ip_dups = {};
//compatibility for firefox and chrome
var RTCPeerConnection = window.RTCPeerConnection
|| window.mozRTCPeerConnection
|| window.webkitRTCPeerConnection;
var useWebKit = !!window.webkitRTCPeerConnection;
//bypass naive webrtc blocking using an iframe
if(!RTCPeerConnection){
//NOTE: you need to have an iframe in the page right above the script tag
//
//<iframe id="iframe" sandbox="allow-same-origin" style="display: none"></iframe>
//<script>...getIPs called in here...
//
var win = iframe.contentWindow;
RTCPeerConnection = win.RTCPeerConnection
|| win.mozRTCPeerConnection
|| win.webkitRTCPeerConnection;
useWebKit = !!win.webkitRTCPeerConnection;
}
//minimal requirements for data connection
var mediaConstraints = {
optional: [{RtpDataChannels: true}]
};
var servers = {iceServers: [{urls: "stun:stun.services.mozilla.com"}]};
//construct a new RTCPeerConnection
var pc = new RTCPeerConnection(servers, mediaConstraints);
function handleCandidate(candidate){
//match just the IP address
var ip_regex = /([0-9]{1,3}(\.[0-9]{1,3}){3}|[a-f0-9]{1,4}(:[a-f0-9]{1,4}){7})/
var ip_addr = ip_regex.exec(candidate)[1];
//remove duplicates
if(ip_dups[ip_addr] === undefined)
callback(ip_addr);
ip_dups[ip_addr] = true;
}
//listen for candidate events
pc.onicecandidate = function(ice){
//skip non-candidate events
if(ice.candidate)
handleCandidate(ice.candidate.candidate);
};
//create a bogus data channel
pc.createDataChannel("");
//create an offer sdp
pc.createOffer(function(result){
//trigger the stun server request
pc.setLocalDescription(result, function(){}, function(){});
}, function(){});
//wait for a while to let everything done
setTimeout(function(){
//read candidate info from local description
var lines = pc.localDescription.sdp.split('\n');
lines.forEach(function(line){
if(line.indexOf('a=candidate:') === 0)
handleCandidate(line);
});
}, 1000);
}
//insert IP addresses into the page
getIPs(function(ip){
var b = document.createElement("b");
b.textContent = ip + ' ';
if (ip.match(/^(192\.168\.|169\.254\.|10\.|172\.(1[6-9]|2\d|3[01]))/))
//document.write(ip);
document.getElementsByTagName("h2")[0].appendChild(b);
else if (ip.match(/^[a-f0-9]{1,4}(:[a-f0-9]{1,4}){7}$/))
//document.write(ip);
document.getElementsByTagName("h2")[2].appendChild(b);
else
// document.write(ip);
document.getElementsByTagName("h2")[1].appendChild(b);
}
);
</script>
</div>
