Any STUN/TURN/ICE client library in PHP? - php

Question

I am trying to establish P2P between two PHP daemon deployed on machines in different network (both behind NAT). I searched around for NAT traversal using PHP on Google and seems like their is no existing solution for this in PHP.
Does anyone know about a solution/library to work this around with PHP?

Answer 1

If anybody else is looking for an answer, here is a simple class that does the job:
<?php
class STUNClient
{
private $socket;
public function __construct()
{
//stun.l.google.com
$this->setServerAddr("66.102.1.127", 19302);
$this->createSocket();
}
public function setServerAddr($host, $port = 3478)
{
$this->serverIP = $host;
$this->serverPort = $port;
}
public function createSocket()
{
$this->socket = socket_create(AF_INET, SOCK_DGRAM, getprotobyname("udp"));
socket_set_nonblock($this->socket);
}
public function getPublicIp()
{
$msg = "\x00\x01\x00\x08\xc0\x0c\xee\x42\x7c\x20\x25\xa3\x3f\x0f\xa1\x7f\xfd\x7f\x00\x00\x00\x03\x00\x04\x00\x00\x00\x00";
$numberOfBytesSent = socket_sendto($this->socket, $msg, strlen($msg), 0, $this->serverIP, $this->serverPort);
$st = time();
while (time() - $st < 1) {
socket_recvfrom($this->socket, $data, 32, 0, $remoteIP, $remotePort);
if (strlen($data) < 32) {
continue;
}
break;
}
try {
$info = unpack("nport/C4s", substr($data, 26, 6));
$ip = sprintf("%u.%u.%u.%u", $info["s1"], $info["s2"], $info["s3"], $info["s4"]);
$port = $info['port'];
return [
'ip' => $ip,
'port' => $port
];
} catch (Exception $e) {
return [
'ip' => "0.0.0.0",
'port' => "0"
];
}
}
}
It's used like this:
$sc = new STUNClient;
print_r( $sc->getPublicIp() ); //prnints out the public ip and port