PHP Doku:: Ein SNMP Objekt holen - function.snmpget.html

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maxie_ro at do dot not dot spam dot yahoo dot com
25.06.2009 15:23


This function can be used to identify devices on a network, by getting their sysObjectID and sysDescr. On short, this is what I did:

<?php

   $sysid = @snmpget($ip, 'public', '.1.3.6.1.2.1.1.2.0', 300);

   if($sysid) {

      $sysdescr = @snmpget($ip, 'public', '.1.3.6.1.2.1.1.1.0', 300);

   }

?>



What I get for equipments, for example:

<?php

   $sysid = 'OID: .iso.3.6.1.4.1.5003.8.1.1.57';// => AudioCodes MP114;

   //.iso.3.6.1.4.1. is a "prefix" for the OID domain

   //5003 is the IANA number for AudioCodes

   //8.1.1.57 identifies the equipment type (MP-114)

   $sysdescr = '"Product: MP-114 FXS;SW Version: 5.00A.024"';

?>

Unfortunately, not all of them report correct objectID, for example they report only the vendor and stop there etc.



In case you are wondering why I used the code '.1.3.6.1.2.1.1.2.0' in the function call instead of "sysObjectID.0", it's because only numeric codes seem to work on Windows. For more codes, google "cisco SNMP Object Navigator".

Have fun.

phil dot a dot miller at gmail dot com
25.11.2008 22:23


I had better success getting snmp to work with my website using snmpgetnext and adding a '.' before the OID. For example: 



$model_conn = snmpgetnext('0.0.0.0', 'public', '.1.3.6.1.4.1.367.3.2.1.1.1.1', 1000000000);

$model = str_replace(array("STRING:", "\""),"",$model_conn);

d dot shereck at gmail dot com
20.11.2008 0:24


For those wishing to use v2 or 3



you can consult the php_snmp.h header

here is the list of functions



PHP_FUNCTION(snmpget);

PHP_FUNCTION(snmpgetnext);

PHP_FUNCTION(snmpwalk);

PHP_FUNCTION(snmprealwalk);

PHP_FUNCTION(snmp_get_quick_print);

PHP_FUNCTION(snmp_set_quick_print);

PHP_FUNCTION(snmp_set_enum_print);

PHP_FUNCTION(snmp_set_oid_output_format);

PHP_FUNCTION(snmpset);



PHP_FUNCTION(snmp2_get);

PHP_FUNCTION(snmp2_getnext);

PHP_FUNCTION(snmp2_walk);

PHP_FUNCTION(snmp2_real_walk);

PHP_FUNCTION(snmp2_set);



PHP_FUNCTION(snmp3_get);

PHP_FUNCTION(snmp3_getnext);

PHP_FUNCTION(snmp3_walk);

PHP_FUNCTION(snmp3_real_walk);

PHP_FUNCTION(snmp3_set);



PHP_FUNCTION(snmp_set_valueretrieval);

PHP_FUNCTION(snmp_get_valueretrieval);

ac221 at sussex dot ac dot uk
24.11.2007 22:49


Some SNMP agents return mac addresses as hex encoded ascii.



e.g. '30:30:3a:31:37:3a:66:32:3a:39:62:3a:34:36:3a:30:65'



Each octet represents 4 bits of the mac address.

Some vendors may also encode the separators into the string.



Heres a function to convert these strings back into plain hex.



<?php

$hexStr = '30:30:3a:31:37:3a:66:32:3a:39:62:3a:34:36:3a:30:65';



echo(str_replace(':','',hexStr2Ascii($hexStr)));



function hexStr2Ascii($hexStr,$separator = ':'){

    $hexStrArr = explode($separator,$hexStr);

    $asciiOut = null;

    foreach($hexStrArr as $octet){

        $asciiOut .= chr(hexdec($octet));

    }

    return $asciiOut;

}

?>



Outputs: '0017f29b460e'

brunoseys at telenet dot be
2.10.2007 13:22


According the SNMPv2-MIB DEFINITIONS the right syntax should be "system.sysContact.0" and NOT "system.SysContact.0" as used in the above example 2251. 



SNMPv2-MIB DEFINITIONS 

... 

sysContact OBJECT-TYPE 

SYNTAX DisplayString (SIZE (0..255)) 

MAX-ACCESS read-write 

STATUS current 

DESCRIPTION 

"The textual identification of the contact person for this 

managed node, together with information on how to contact 

this person. If no contact information is known, the 

value 

is the zero-length string." 

::= { system 4 }

Malaka Udawatta (malaka13 at gmail dot com)
19.09.2007 14:17


When I try to get a 64 bit counter variable (e.g. ifHCInOctets) using snmpget function, following error message was appeared.



Error in packet: (noSuchName) There is no such variable name in this MIB



The solution for this is to use snmp2_get(); function. The prameters are same as snmpget();

Eduardo
12.04.2007 21:30


The online documentation says that the function returns "FALSE" on error but, actually, it returns NULL on error.

tridman
21.11.2006 11:48


The timeout is in micro seconds. Thus 1.000.000 means 1 Second.

michael dot mauch at gmx dot de
10.11.2006 18:07


I have no idea what the timeout value is, but 1 second is really really 1 000 000 000 nano seconds (cf. http://en.wikipedia.org/wiki/SI_prefix).

fbleau
11.07.2006 20:15


The default value of Timeout is 1000000  nanoseconde (1 sec) and the retrie is 5 thsi value is set by Net-SNMP library.



#!/usr/local/bin/php

<?php

 $time_start = microtime(true);

 $reponse = snmpget('10.5.1.1', 'public', "1.3.6.1.2.1.1.3.0",1000000,5);

 $time_end = microtime(true);

 $time = $time_end - $time_start;



 echo "Delay in $time secondes\n";

?>

Jim
14.05.2006 16:52


Unfortunately, It appears that you can not put multiple objects into the snmpget function, ie: sysUpTime.0 ifInOctets.1 ifOutOctets.1.  For what it's worth, the time argument is in nano-seconds as previously mentioned.  There is a lot of conflicting information out there about this.

dstjohn-NO-SPAM at mediacast1 dot com
11.09.2005 23:16


2 year tidbit update :)



<?php

// author: dstjohn at mediacast1.com

// updated: 09-11-2005

// set some vars

$snmpcommunity = 'PUBLIC'; //snmp community name

$ips = 'test1.com,test2.com'; //ips or dns to get snmp data from

$system_number = '1';

//end da vars



//start da loop d loop

for ($i = 0; $i <= $system_number; $i++) {

$sysip = explode(",",$ips);



//get system name

$sysname[0] = snmpget($sysip[$i], $snmpcommunity, "sysName.0");

$sysname[1] = eregi_replace("STRING:","",$sysname[0]);

echo 'System Name: '.$sysname[1].'<br>';



//system description

$sysdesc[0] = snmpget($sysip[$i], $snmpcommunity, "sysDescr.0");

$sysdesc[1] = eregi_replace("STRING:","",$sysdesc[0]);

echo 'System Description: '.$sysdesc[1].'<br>';



//system location

$sysloc[0] = snmpget($sysip[$i], $snmpcommunity, "sysLocation.0");

$sysloc[1] = eregi_replace("STRING:","",$sysloc[0]);

echo 'System Location: '.$sysloc[1].'<br>';



//current tcp connections

$tcpcons[0] = snmpget($sysip[$i], $snmpcommunity, "tcpCurrEstab.0");

$tcpcons[1] = eregi_replace("Gauge32:","",$tcpcons[0]);

echo 'Open TCP/IP Connections: '.$tcpcons[1].'<br>';



//get system uptime

$sysuptime[0] = snmpget($sysip[$i], $snmpcommunity, "system.sysUpTime.0");

$sysuptime[1] = eregi_replace("Timeticks:","",$sysuptime[0]);

echo 'System Uptime: Timeticks -'.$sysuptime[1].'<br>';



//windows only

//installed memory

if(eregi('Windows',$sysdesc[1])){

$mem[0] = snmpget($sysip[$i], $snmpcommunity, "HOST-RESOURCES-MIB::hrMemorySize.0");

$mem[1] = eregi_replace("INTEGER:","",$mem[0]);

$mem[2] = eregi_replace("KBytes","",$mem[1]);

echo 'Insalled Memory: '.$mem[2].' KiloBytes<br>';

}



echo '<br><br>';

}//end loop



?>

Johann Glaser
22.02.2004 21:39


It seems that for each snmpget() its own socket() will be opened. This is not closed after snmpget() finishes. Neither existing sockets are reused by subsequent snmpget() calls.



When querying a few switches with lots of ports the maximum file descriptor count of Apache is exhausted. Thus no more snmpget() are possible. Additionaly no more files can be read by this particular Apache process. Neither the PHP file, any include files nor any other files (like a .css file, ...).



This probably explains the observation of tkjode at phalnet dot com. Different to his case is that I'm using Linux.

dstjohn-NO-SPAM at mediacast1 dot com
23.09.2003 4:53


Little tidbit for snmpget function



<?php

//snmpget system stats

$host = 'localhost';

$community = 'public';



//get system name

$sysname = snmpget($host, $community, "system.sysName.0");



//get system uptime

$sysup = snmpget($host, $community, "system.sysUpTime.0");

$sysupre = eregi_replace("([0-9]{3})","",$sysup);

$sysupre2 = eregi_replace("Timeticks:","",$sysupre);

$sysupre3 = eregi_replace("[()]","",$sysupre2);



//get tcp connections

$tcpcon = snmpget($host, $community,"tcp.tcpCurrEstab.0");

$tcpconre = eregi_replace("Gauge32:","",$tcpcon);



echo '

System Name: '.$sysname.'<br>

System Uptime: '.$sysupre3.'<br>

Current Tcp Connections: '.$tcpconre.'<br>';



?>

javierb at gmx dot net
4.06.2003 17:08


pooling a cisco.



$ip = '1.1.1.1';

$community ='publico';

$a = snmpget($ip,$community, "IF-MIB::ifLastChange.1")

$b = snmpget($ip,$community, "IF-MIB::ifAlias.1");

print("a = ".$a."\n"."b = ".$b."\n");



a = Timeticks: (929969969) 107 days, 15:14:59.69

b = Timeticks: (929969969) 107 days, 15:14:59.69



when the interface has not description.

tkjode at phalnet dot com
12.02.2002 20:49


It has been observed on NT/2000 systems that flooding devices with SNMP requests will cause NT's SNMP service to stop working.



For example, I polled 183 switches on our network just fine.  I then attempted to simulate heavy traffic to that page by refreshing and breaking connections (as any real world system would have to go through).  SNMP stopped working throughout the entire machine, including non-PHP/Webserver processes.

grice at berbee dot com
25.08.2000 1:05


It looks like you can use a non-standard port for SNMP


with something like this:





$foo = snmpwalk('foo.bar.com:1161', 'foofoo', '.1.3.6');





This is on PHP 3.16; I haven't managed to get PHP 4.02 to compile successfully on Solaris 2.6 yet.


--Michael

Ein Service von Reinhard Neidl - Webprogrammierung.

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