This repository has been archived by the owner on Jul 16, 2021. It is now read-only.
-
Notifications
You must be signed in to change notification settings - Fork 0
/
PHP_SNMP.php
254 lines (219 loc) · 8.55 KB
/
PHP_SNMP.php
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
<?php
/**
Original source : https://code.google.com/p/php-snmp/
Licence : GNU GPLv3
* Class for sending SNMP V2c traps.
*
* Usege:
*
* $host = '192.168.1.1';
* $community = 'public';
*
* $vars[] = array('oid'=>'1.3.6.1.4.1.143.101.14.1.1.2.0', 'value'=>'message 1');
* $vars[] = array('oid'=>'1.3.6.1.4.1.143.101.14.1.1.2.1', 'value'=>'message 2');
*
* SNMP::trap($host, $vars, $community);
*
* @package PHP_SNMP
* @version 0.2
* @author Taras Kalapun <t.kalapun@gmail.com>
*/
class PHP_SNMP {
/**
* Main function to send SNMP v2c traps
*
* @param string $ip IP address of trap demon.
* @param array $varBinds variable bindings.
* @param string $community OPTIONAL Name of community to send traps to.
* @return bool
*/
public static function trap($ip, $varBinds=null, $community='public', $snmpTrapOID='1.3.6.1.2.1.31.2.1')
{
$data = self::prepareTrapPacket($varBinds, $community, $snmpTrapOID);
//if ($debug) dump($data);
$socket = socket_create(AF_INET, SOCK_DGRAM, SOL_UDP);
socket_sendto($socket, $data, strlen($data), 0, $ip, 162);
socket_close($socket);
return true;
}
/*
$varBinds = array(array('oid', 'value', opt 'type'), [..]) // OID including count
*/
protected static function prepareTrapPacket($varBinds, $community, $snmpTrapOID, $requestId=null)
{
$pSnmp['version'] = self::packVar(1); //pack('H*', '0201'.'01'); // version SNMP v2c
$pSnmp['community'] = self::packVar($community);
$pSnmp['type'] = pack('H*', 'a7'); // SNMPv2-Trap-PDU
$requestId = ($requestId) ? $requestId : rand(-214783648, 2147483647); // request-id INTEGER (-214783648..214783647)
$pSnmp['requestId'] = self::packVar($requestId);
$pSnmp['errorStatus'] = self::packVar(0);
$pSnmp['errorIndex'] = self::packVar(0);
$upTime = rand(100, 157784630) * 100; // The time in tens of milliseconds (1:40 -> 5 years)
$pSnmp['sysUpTime'] = self::packVarBind(array('oid' => '1.3.6.1.2.1.1.3.0',
'value' => $upTime,
'type' => 'o' // x43
));
// Mandatory : snmpTrapOID.0 => enterpriseOID
$pSnmp['snmpTrapOID'] = self::packVarBind(array('oid' => '1.3.6.1.6.3.1.1.4.1.0',
'value' => $snmpTrapOID,
'type' => 'oid'
));
$pSnmp['varBinds'] = $pSnmp['sysUpTime']
. $pSnmp['snmpTrapOID']
. self::packVarBinds($varBinds);
$pSnmp['varBindsHeader'] = pack('H*', '30' . self::hexlen($pSnmp['varBinds'],1));
$pSnmp['body'] = $pSnmp['requestId']
. $pSnmp['errorStatus']
. $pSnmp['errorIndex']
. $pSnmp['varBindsHeader']
. $pSnmp['varBinds'];
$pSnmp['bodyLen'] = pack('H*', self::hexlen($pSnmp['body'],1));
$snmpPack = $pSnmp['version']
. $pSnmp['community']
. $pSnmp['type']
. $pSnmp['bodyLen']
. $pSnmp['body'];
$snmpPacket = pack('H*', '30' . self::hexlen($snmpPack,1))
. $snmpPack;
return $snmpPacket;
}
protected static function packVarBinds($varBinds=null)
{
$varPack = array();
if ($varBinds) foreach ($varBinds as $var) $varPack[] = self::packVarBind($var);
return implode('', $varPack);
}
/*
$varBind = array('oid' , 'value')
Description:
beta oid packer
oid count pass inside oid
varBind = bindType + bindSize + oidType + oidSize + oid + valType + valSize + val
*/
protected static function packVarBind($varBind)
{
$varHead = self::packVar($varBind['oid'], 'oid');
$varBody = self::packVar($varBind['value'], $varBind['type']);
$varHB = $varHead . $varBody;
$varPackSize = strlen($varHead) + strlen($varBody);
$varPack = pack('H*', '30' . self::hexlen($varHB)) . $varHB;
return $varPack;
}
protected static function packVar($var, $type=null, $varInHex=false)
{
// http://linux.die.net/man/1/snmptrap
/**
* @link http://en.wikipedia.org/wiki/Basic_encoding_rules
P/C is the primitive/constructed bit, it specifies if the value is primitive like an INTEGER or constructed which means, it again holds TLV values like a SET. If the bit is "on" (value = 1), it indicates a constructed value.
Name P/C dec hex
EOC (End-of-Content) P 0 0x00
BOOLEAN P 1 0x01
INTEGER P 2 0x02
BIT STRING P/C 3 0x03
OCTET STRING P/C 4 0x04
NULL P 5 0x05
OBJECT IDENTIFIER P 6 0x06
Object Descriptor P 7 0x07
EXTERNAL C 8 0x08
REAL (float) P 9 0x09
ENUMERATED P 10 0x0A
EMBEDDED PDV C 11 0x0B
UTF8String P/C 12 0x0C
RELATIVE-OID P 13 0x0D
SEQUENCE and SEQUENCE OF C 16 0x10
SET and SET OF C 17 0x11
NumericString P/C 18 0x12
PrintableString P/C 19 0x13
T61String P/C 20 0x14
VideotexString P/C 21 0x15
IA5String P/C 22 0x16
UTCTime P/C 23 0x17
GeneralizedTime P/C 24 0x18
GraphicString P/C 25 0x19
VisibleString P/C 26 0x1A
GeneralString P/C 27 0x1B
UniversalString P/C 28 0x1C
CHARACTER STRING P/C 29 0x1D
BMPString P/C 30 0x1E
IpAddress 40
Counter (Counter32 in SNMPv2) 41
Gauge (Gauge32 in SNMPv 2) 42
TimeTicks 43
Opaque 44
NsapAddress 45
Counter64 (available only in SNMPv2) 46
Uinteger32 (available only in SNMPv2) 47
*/
$type2hex = array( 's'=>'04', 'i'=>'02', 'oid'=>'06', 'o'=>'43', 'a' => '40', 'c' => '41' );
if ($type[0] == 'x') {
$typeHex = $type[1] . $type[2];
$type = 'x';
} else {
$type = ($type=='oid') ? $type : substr($type, 0, 1);
$type = ($type) ? $type : substr(gettype($var), 0, 1);
$typeHex = $type2hex[$type];
}
$varHex = '';
if ($type == 'i') $varHex = ($varInHex) ? $var : self::dec2hex($var);
if ($type == 'c') $varHex = ($varInHex) ? $var : self::dec2hex($var);
if ($type == 's') $varHex = ($varInHex) ? $var : self::str2hex($var);
if ($type == 'o') $varHex = ($varInHex) ? $var : self::dec2hex($var);
if ($type == 'a') $varHex = ($varInHex) ? $var : self::dec2hex(ip2long($var), 4); // IP represented as 4 bytes
if ($type == 'x') $varHex = ($varInHex) ? $var : $var; // if object, we pass hex data in $var
if ($type == 'oid') $varHex = ($varInHex) ? $var : self::oid2hex($var);
$bodyPack = pack('H*', $varHex);
$headPack = pack('H*', $typeHex . self::hexlen($bodyPack) );
return $headPack . $bodyPack;
}
protected static function hexlen($s, $showPrefix=false)
{
$len = strlen($s);
$prefix = ($showPrefix) ? '81' : '';
if ($len > 255) $prefix = '82';
if ($len > 65535) $prefix = '83';
return $prefix . self::dec2hex($len);
}
private static function str2hex($s)
{
$hex = '';
for ($i=0;$i<strlen($s);$i++) $hex .= self::dec2hex(ord($s[$i]));
return $hex;
}
private static function oid2hex($n)
{
// Partie conversion entier -> format ASN.1 / BER (https://fr.wikipedia.org/wiki/Basic_Encoding_Rules)
// http://www.itu.int/ITU-T/studygroups/com17/languages/X.690-0207.pdf 8.19
// http://stackoverflow.com/questions/3376357/how-to-convert-object-identifiers-to-hex-strings
// https://github.com/fgrosse/PHPASN1/blob/master/lib/ASN1/Base128.php
if (is_int($n)) {
// "LSB" => 7bit direct
$oidHex = self::dec2hex($n % 128);
$n = floor($n/128);
// While not in 7bit => add modulus (with "more" mark) and divide
while ($n > 127) {
$oidHex = self::dec2hex(128|$n%128) . $oidHex;
$n = floor($n/128);
}
// If final multiplier, add it (with "more" mark)
if ($n > 0)
$oidHex = self::dec2hex(128|$n) . $oidHex;
//$oidHex = ($n>127) ? self::dec2hex(128|$n/128) . self::dec2hex($n%128) : self::dec2hex($n);
} else {
$oidHex = '';
$oid = explode('.', $n);
$n1 = (40 * $oid[0]) + $oid[1];
$oidHex .= self::dec2hex($n1);
unset($oid[0], $oid[1]);
foreach ($oid as $n)
$oidHex .= self::oid2hex( (int)$n );
}
return $oidHex;
}
private static function dec2hex($n, $minByte=1)
{
$n = dechex($n);
$n = str_pad($n, $minByte*2, '0', STR_PAD_LEFT);
return $n;
}
}
?>