[转]PHP中使用ICMP,socket,ping

如果是windows,需要在php.ini把socket的dll打开。
error_reporting(E_ALL);


<?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 = “x00x00”; // generate checksum for icmp request
$id = “x00x00”; // we will have to work with this later
$sqn = “x00x00”; // 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(“www.google.ca”);

if ($ping->time)
echo “Time: “.$ping->time;
else
echo $ping->errstr;

?>