note 80775 added to function.socket-create
| From: | JeanCharlesMAMMANA at osu1 dot php dot net | Date: | Thu, 31 Jan 2008 12:54:16 +0000 |
| Subject: | note 80775 added to function.socket-create | ||
| Groups: | php.notes | ||
| Request: | Send a blank email to php-notes+get-135647@lists.php.net to get a copy of this message | ||
I've written the ping() function using socket_create() with SOCK_RAW.
(on Unix System, you need to have the root acces to execute this function)
<?php
/// start ping.inc.php ///
$g_icmp_error = "No Error";
// timeout in ms
function ping($host, $timeout)
{
$port = 0;
$datasize = 64;
global $g_icmp_error;
$g_icmp_error = "No Error";
$ident = array(ord('J'), ord('C'));
$seq = array(rand(0, 255), rand(0, 255));
$packet = '';
$packet .= chr(8); // type = 8 : request
$packet .= chr(0); // code = 0
$packet .= chr(0); // checksum init
$packet .= chr(0); // checksum init
$packet .= chr($ident[0]); // identifier
$packet .= chr($ident[1]); // identifier
$packet .= chr($seq[0]); // seq
$packet .= chr($seq[1]); // seq
for ($i = 0; $i < $datasize; $i++)
$packet .= chr(0);
$chk = icmpChecksum($packet);
$packet[2] = $chk[0]; // checksum init
$packet[3] = $chk[1]; // checksum init
$sock = socket_create(AF_INET, SOCK_RAW, getprotobyname('icmp'));
$time_start = microtime();
socket_sendto($sock, $packet, strlen($packet), 0, $host, $port);
$read = array($sock);
$write = NULL;
$except = NULL;
$select = socket_select($read, $write, $except, 0, $timeout * 1000);
if ($select === NULL)
{
$g_icmp_error = "Select Error";
socket_close($sock);
return -1;
}
elseif ($select === 0)
{
$g_icmp_error = "Timeout";
socket_close($sock);
return -1;
}
$recv = '';
$time_stop = microtime();
socket_recvfrom($sock, $recv, 65535, 0, $host, $port);
$recv = unpack('C*', $recv);
if ($recv[10] !== 1) // ICMP proto = 1
{
$g_icmp_error = "Not ICMP packet";
socket_close($sock);
return -1;
}
if ($recv[21] !== 0) // ICMP response = 0
{
$g_icmp_error = "Not ICMP response";
socket_close($sock);
return -1;
}
if ($ident[0] !== $recv[25] || $ident[1] !== $recv[26])
{
$g_icmp_error = "Bad identification number";
socket_close($sock);
return -1;
}
if ($seq[0] !== $recv[27] || $seq[1] !== $recv[28])
{
$g_icmp_error = "Bad sequence number";
socket_close($sock);
return -1;
}
$ms = ($time_stop - $time_start) * 1000;
if ($ms < 0)
{
$g_icmp_error = "Response too long";
$ms = -1;
}
socket_close($sock);
return $ms;
}
function icmpChecksum($data)
{
$bit = unpack('n*', $data);
$sum = array_sum($bit);
if (strlen($data) % 2) {
$temp = unpack('C*', $data[strlen($data) - 1]);
$sum += $temp[1];
}
$sum = ($sum >> 16) + ($sum & 0xffff);
$sum += ($sum >> 16);
return pack('n*', ~$sum);
}
function getLastIcmpError()
{
global $g_icmp_error;
return $g_icmp_error;
}
/// end ping.inc.php ///
?>
----
Server IP: 217.174.223.124
Probable Submitter: 217.171.24.53
----
Manual Page -- http://www.php.net/manual/en/function.socket-create.php
Edit -- https://master.php.net/note/edit/80775
Del: integrated -- https://master.php.net/note/delete/80775/integrated
Del: useless -- https://master.php.net/note/delete/80775/useless
Del: bad code -- https://master.php.net/note/delete/80775/bad+code
Del: spam -- https://master.php.net/note/delete/80775/spam
Del: non-english -- https://master.php.net/note/delete/80775/non-english
Del: in docs -- https://master.php.net/note/delete/80775/in+docs
Del: other reasons-- https://master.php.net/note/delete/80775
Reject -- https://master.php.net/note/reject/80775
Search -- https://master.php.net/manage/user-notes.php