<?php

	$data = "var tracepoints = {'points': [";

	define ("SOL_IP", 0);
	define ("IP_TTL", 2);	// On OSX, use '4' instead of '2'.
	
	
	$dest_url = "google.com";
	
	$maximum_hops = 30;
	$port = 33434;
	
	function ip2geo ($host) {
		global $argv;
		// Get GeoIP info
		@$data = file_get_contents('http://ipinfo.io/'.$host);
		if ($data) {
			$data = json_decode($data);
			return $data->loc;
		} else {
			// An error has accourred
			return "(No geo info found)";
		}
	}
	
	$dest_addr = gethostbyname ($dest_url);

	$ttl = 1;
	while ($ttl < $maximum_hops) {
		// Create ICMP and UDP sockets
		$recv_socket = socket_create (AF_INET, SOCK_RAW, getprotobyname ('icmp'));
		$send_socket = socket_create (AF_INET, SOCK_DGRAM, getprotobyname ('udp'));

		// Set TTL to current lifetime
		socket_set_option ($send_socket, SOL_IP, IP_TTL, $ttl);

		// Bind receiving ICMP socket to default IP (no port needed since it's ICMP)
		socket_bind ($recv_socket, 0, 0);

		// Save the current time for roundtrip calculation
		$t1 = microtime (true);

		// Send a zero sized UDP packet towards the destination
		socket_sendto ($send_socket, "", 0, 0, $dest_addr, $port);

		// Wait for an event to occur on the socket or timeout after 5 seconds. This will take care of the
		// hanging when no data is received (packet is dropped silently for example)
		$r = array ($recv_socket);
		$w = $e = array ();
		socket_select ($r, $w, $e, 5, 0);

		// Nothing to read, which means a timeout has occurred.
		if (count ($r)) {
			// Receive data from socket (and fetch destination address from where this data was found)
			socket_recvfrom ($recv_socket, $buf, 512, 0, $recv_addr, $recv_port);

			$recv_geo = ip2geo ($recv_addr);

			$recv_geo_split = explode(",", $recv_geo);

			$data .= sprintf("{'x':%s,'y':%s},", $recv_geo_split[0], $recv_geo_split[1]);

		}

		socket_close ($recv_socket);
		socket_close ($send_socket);

		$ttl++;

		if ($recv_addr == $dest_addr) break;
	}

	$data = substr($data, 0, -1) . "]}"; 

	printf ("%s\n", $data);

	$fp = fopen('traceroute.js', 'w');
	fwrite($fp, json_encode($data));
	fclose($fp);


?>