<?php
class net_ping
{
var $icmp_socket;
var $request;
var $request_len;
var $reply;
var $errstr;
var $time;
var $timer_start_time;
function net_ping()
{
$this->icmp_socket = socket_create(af_inet, sock_raw, 1);
socket_set_block($this->icmp_socket);
}
function ip_checksum($data)
{
for($i=0;$i<strlen($data);$i += 2)
{
if($data[$i+1]) $bits = unpack('n*',$data[$i].$data[$i+1]);
else $bits = unpack('c*',$data[$i]);
$sum += $bits[1];
}
while ($sum>>16) $sum = ($sum & 0xffff) + ($sum >> 16);
$checksum = pack('n1',~$sum);
return $checksum;
}
function start_time()
{
$this->timer_start_time = microtime();
}
function get_time($acc=2)
{
// format start time
$start_time = explode (" ", $this->timer_start_time);
$start_time = $start_time[1] + $start_time[0];
// get and format end time
$end_time = explode (" ", microtime());
$end_time = $end_time[1] + $end_time[0];
return number_format ($end_time - $start_time, $acc);
}
function build_packet()
{
$data = "abcdefghijklmnopqrstuvwabcdefghi"; // the actual test data
$type = "/x08"; // 8 echo message; 0 echo reply message
$code = "/x00"; // always 0 for this program
$chksm = "/x00/x00"; // generate checksum for icmp request
$id = "/x00/x00"; // we will have to work with this later
$sqn = "/x00/x00"; // we will have to work with this later
// now we need to change the checksum to the real checksum
$chksm = $this->ip_checksum($type.$code.$chksm.$id.$sqn.$data);
// now lets build the actual icmp packet
$this->request = $type.$code.$chksm.$id.$sqn.$data;
$this->request_len = strlen($this->request);
}
function ping($dst_addr,$timeout=5,$percision=3)
{
// lets catch dumb people
if ((int)$timeout <= 0) $timeout=5;
if ((int)$percision <= 0) $percision=3;
// set the timeout
socket_set_option($this->icmp_socket,
sol_socket, // socket level
so_rcvtimeo, // timeout option
array(
"sec"=>$timeout, // timeout in seconds
"usec"=>0 // i assume timeout in microseconds
)
);
if ($dst_addr)
{
if (@socket_connect($this->icmp_socket, $dst_addr, null))
{
} else {
$this->errstr = "cannot connect to $dst_addr";
return false;
}
$this->build_packet();
$this->start_time();
socket_write($this->icmp_socket, $this->request, $this->request_len);
if (@socket_recv($this->icmp_socket, &$this->reply, 256, 0))
{
$this->time = $this->get_time($percision);
return $this->time;
} else {
$this->errstr = "timed out";
return false;
}
} else {
$this->errstr = "destination address not specified";
return false;
}
}
}
$ping = new net_ping;
$ping->ping("<a href="http://www.google.ca" target=_blank>www.google.ca</a>");
if ($ping->time)
echo "time: ".$ping->time;
else
echo $ping->errstr;
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