snmpwalk

(PHP 4, PHP 5, PHP 7)

snmpwalk — Fetch all the SNMP objects from an agent

Descrierea

snmpwalk ( string $hostname , string $community , array|string $object_id , int $timeout = -1 , int $retries = -1 ) : array|bool

snmpwalk() function is used to read all the values from an SNMP agent specified by the hostname.

Parametri

hostname

The SNMP agent (server).

community

The read community.

object_id

If null, object_id is taken as the root of the SNMP objects tree and all objects under that tree are returned as an array.

If object_id is specified, all the SNMP objects below that object_id are returned.

timeout

The number of microseconds until the first timeout.

retries

The number of times to retry if timeouts occur.

Valorile întoarse

Returns an array of SNMP object values starting from the object_id as root or false on error.

Exemple

Example #1 snmpwalk() Example


<?php
$a = snmpwalk("127.0.0.1", "public", ""); 

foreach ($a as $val) {
    echo "$val\n";
}

?>

Above function call would return all the SNMP objects from the SNMP agent running on localhost. One can step through the values with a loop

A se vedea și

snmprealwalk() - Return all objects including their respective object ID within the specified one

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User Contributed Notes 9 notes

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Lars Troen ¶

21 years ago


Note that there's different behaviuor in php snmpwalk and ucd snmpwalk. If you try to walk an oid that has one value not under a subkey of the walked oid, ucd snmpwalk will return the value while php's snmpwalk will not.

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anders at ei dot nu ¶

21 years ago


It would be nice to be able to specify what snmp version to use ( 1,2c,3 )

For now, I'ts hardcoded in ext/snmp/snmp.c

change session.version from 1 to 2c or 3 if you need for now..

i.e 

session.version = SNMP_VERSION_1;

to:
session.version = SNMP_VERSION_2c;

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http://mike.eire.ca ¶

19 years ago


I found on Windows (PHP 5) an empty string did not return anything, it just timed out.  I had to use null instead:

<?php
$a = snmpwalk("127.0.0.1", "public", null);
?>

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steve at ourabode dot org ¶

22 years ago


Timeout is in MICRO seconds.
1,000,000 &micros = 1 s

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layer2 at www dot com ¶

23 years ago


Something to care about in dealing with snmpwalk:<BR>





While walking the MIB, snmpwalk puts info that gets into an array, and that is correct.<BR>





The trouble happened when snmpwalk needs to collect information from instances that contains subinstances (i.e. walking .1.2.3.4.5 and having instances like 1.1, 1.2, 1.3): in this case it gets info and passes into an array, but when walking the array, each value is preceeded by 'Counter32: '.<BR>





I've tested this in many ways and it always happened the same way.

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john at antefacto dot com ¶

23 years ago


Ah. That's why all of our SNMP stuff was timing out anytime there was any load on the system. Sigh. A waste of two weeks trying to debug snmp....



 Even the snmpcmd manpage doesn't give a

unit for timeout.

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billf at freebsd dot org ¶

23 years ago


for the poster wondering what the

timeout field was measured in:



from the ucd-snmp header file snmp_api.h:



    long    timeout; 

    /* Number of uS until first timeout

    then exponential backoff */

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jmartinson(AT_nospam)info234.com ¶

23 years ago


A quick router device view:



<?

include "header.html";



$host = "auscr1";

$community = "tellme";

                     

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

$ifDescr = snmpwalk("$host","$community","interfaces.ifTable.ifEntry.ifDescr");

$ifIndex = snmpwalk("$host","$community","interfaces.ifTable.ifEntry.ifIndex");

$ifAdminStatus = snmpwalk("$host","$community","interfaces.ifTable.ifEntry.ifAdminStatus");

$ifOperStatus = snmpwalk("$host","$community","interfaces.ifTable.ifEntry.ifOperStatus");

$ifLastChange = snmpwalk("$host","$community","interfaces.ifTable.ifEntry.ifLastChange");

                                          

print "<table border=1 bgcolor=#ffffff><tr><td>$host</td></tr></table><br>";

print "<table border=1 bgcolor=#ffffff><tr><td>$sysDescr</td></tr></table><br>";

print "<table border=1 bgcolor=#ffffff>";

print "<tr> 

        <td>ifIndex</td>

        <td>ifDescr</td>

        <td>ifAdminStatus</td>

        <td>ifOperStatus</td>

        <td>ifLastChange</td>

        </tr>";

             

for ($i=0; $i<count($ifIndex); $i++) {

        print "<tr>";

        print "<td>$ifIndex[$i]</td>";

        print "<td>$ifDescr[$i]</td>";

        print "<td>$ifAdminStatus[$i]</td>";

        print "<td>$ifOperStatus[$i]</td>";

        print "<td>$ifLastChange[$i]</td>";

        print "</tr>";

}            

print "</table>";



?>

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-1

bobby [dot] clark [at] eku [dot] edu ¶

21 years ago


I had to use an object_id like these.
'SNMPv2-MIB::system.sysDescr.0'
'IF-MIB::interfaces.ifTable.ifEntry.ifAdminStatus'

<?php
$host = '192.168.1.1';
$community = 'public';
$object_id = 'IF-MIB::interfaces.ifTables.ifEntry.ifAdminStatus';

$sysdesc = snmpwalk($host, $community', $object_id);
print_r($sysdesc);
?>

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