我要评论 1 <?php
2 /// start ping.inc.php ///
3
4 $g_icmp_error = "no error";
5
6 // timeout in ms
7 function ping($host, $timeout)
8 {
9 $port = 0;
10 $datasize = 64;
11 global $g_icmp_error;
12 $g_icmp_error = "no error";
13 $ident = array(ord('j'), ord('c'));
14 $seq = array(rand(0, 255), rand(0, 255));
15
16 $packet = '';
17 $packet .= chr(8); // type = 8 : request
18 $packet .= chr(0); // code = 0
19
20 $packet .= chr(0); // checksum init
21 $packet .= chr(0); // checksum init
22
23 $packet .= chr($ident[0]); // identifier
24 $packet .= chr($ident[1]); // identifier
25
26 $packet .= chr($seq[0]); // seq
27 $packet .= chr($seq[1]); // seq
28
29 for ($i = 0; $i < $datasize; $i++)
30 $packet .= chr(0);
31
32 $chk = icmpchecksum($packet);
33
34 $packet[2] = $chk[0]; // checksum init
35 $packet[3] = $chk[1]; // checksum init
36
37 $sock = socket_create(af_inet, sock_raw, getprotobyname('icmp'));
38 $time_start = microtime(true);
39 socket_sendto($sock, $packet, strlen($packet), 0, $host, $port);
40
41
42 $read = array($sock);
43 $write = null;
44 $except = null;
45
46 $select = socket_select($read, $write, $except, 0, $timeout * 1000);
47 if ($select === null) {
48 $g_icmp_error = "select error";
49 socket_close($sock);
50 return -1;
51 } elseif ($select === 0) {
52 $g_icmp_error = "timeout";
53 socket_close($sock);
54 return -1;
55 }
56
57 $recv = '';
58 $time_stop = microtime(true);
59 socket_recvfrom($sock, $recv, 65535, 0, $host, $port);
60 $recv = unpack('c*', $recv);
61
62 if ($recv[10] !== 1) // icmp proto = 1
63 {
64 $g_icmp_error = "not icmp packet";
65 socket_close($sock);
66 return -1;
67 }
68
69 if ($recv[21] !== 0) // icmp response = 0
70 {
71 $g_icmp_error = "not icmp response";
72 socket_close($sock);
73 return -1;
74 }
75
76 if ($ident[0] !== $recv[25] || $ident[1] !== $recv[26]) {
77 $g_icmp_error = "bad identification number";
78 socket_close($sock);
79 return -1;
80 }
81
82 if ($seq[0] !== $recv[27] || $seq[1] !== $recv[28]) {
83 $g_icmp_error = "bad sequence number";
84 socket_close($sock);
85 return -1;
86 }
87
88 $ms = bcmul(bcsub($time_stop, $time_start, 6), 1000);
89
90 if ($ms < 0) {
91 $g_icmp_error = "response too long";
92 $ms = -1;
93 }
94
95 socket_close($sock);
96
97 return $ms;
98 }
99
100 function icmpchecksum($data)
101 {
102 $bit = unpack('n*', $data);
103 $sum = array_sum($bit);
104
105 if (strlen($data) % 2) {
106 $temp = unpack('c*', $data[strlen($data) - 1]);
107 $sum += $temp[1];
108 }
109
110 $sum = ($sum >> 16) + ($sum & 0xffff);
111 $sum += ($sum >> 16);
112
113 return pack('n*', ~$sum);
114 }
115
116 function getlasticmperror()
117 {
118 global $g_icmp_error;
119 return $g_icmp_error;
120 }
121 /// end ping.inc.php ///
使用方法:
$ping = ping('www.baidu.com',200);
if ($ping > 0) {
// ok
} else {
// failed
}
如对本文有疑问， 点击进行留言回复！！
网友评论