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snmprealwalk

(PHP 4, PHP 5)

snmprealwalk 指定したオブジェクトに関するオブジェクト ID を含むすべてのオブジェクトを返す

説明

array snmprealwalk ( string $host , string $community , string $object_id [, int $timeout = 1000000 [, int $retries = 5 ]] )

snmprealwalk() 関数は、 object_id から始まる SNMP オブジェクトを走査し、その値とオブジェクト ID を返します。

パラメータ

host

SNMP エージェント (サーバー) のホスト名。

community

リードコミュニティ。

object_id

前にある SNMP オブジェクト ID。

timeout

最初のタイムアウトまでのマイクロ秒数。

retries

タイムアウト発生時の再試行回数。

返り値

成功した場合に SNMP オブジェクト ID とその値の連想配列。エラー時に FALSE を返します。 エラー時には E_WARNING が発生します。

例1 snmprealwalk() の使用法

<?php
 print_r
(snmprealwalk("localhost""public""IF-MIB::ifName"));
?>

上の例の結果は次のようになります。

     
    Array
      (
      [IF-MIB::ifName.1] => STRING: lo
      [IF-MIB::ifName.2] => STRING: eth0
      [IF-MIB::ifName.3] => STRING: eth2
      [IF-MIB::ifName.4] => STRING: sit0
      [IF-MIB::ifName.5] => STRING: sixxs
    )

参考

  • snmpwalk() - エージェントから全ての SNMP オブジェクトを取得する

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User Contributed Notes 7 notes

up
1
scot at indievisible dot org
8 years ago
Since PHP doesn't have a nice snmptable-like function... here is a quick-and-dirty hack that works for me. Works on complete and sparse tables. The example oids are for the route (complete) and interface (often sparse) tables.

<?php
    $a
= snmptable("10.1.1.1", "public", ".1.3.6.1.2.1.4.21") or die("error");
   
print_r($a);
   
$a = snmptable("10.1.1.1", "public", ".1.3.6.1.2.1.2.2") or die("error");
   
print_r($a);

function
snmptable($host, $community, $oid) {
   
// TODO: get original state and restore at bottom
   
snmp_set_oid_numeric_print(TRUE);
   
snmp_set_quick_print(TRUE);
   
snmp_set_enum_print(TRUE);

   
$retval = array();
   
$raw = snmprealwalk($host, $community, $oid) or die("snmptable: unable to walk OID $oid");

   
$prefix_length = 0;

    foreach (
$raw as $key => $value) {
        if (
$prefix_length == 0) {
           
// don't just use $oid's length since it may be non-numeric
           
$prefix_elements = count(explode('.',$oid));
           
$tmp = '.' . strtok($key, '.');
            while (
$prefix_elements > 1) {
               
$tmp .= '.' . strtok('.');
               
$prefix_elements--;
            }
           
$tmp .= '.';
           
$prefix_length = strlen($tmp);
        }
       
$key = substr($key, $prefix_length);
       
$index = explode('.', $key, 2);
        isset(
$retval[$index[1]]) or $retval[$index[1]] = array();
        isset(
$firstrow) or $firstrow = $index[1];
       
$retval[$index[1]][$index[0]] = $value;
    }

   
// check for holes in the table and fill them in
   
foreach ($retval[$firstrow] as $key => $tmp) {
        foreach(
$retval as $check => $tmp2) {
            if (! isset(
$retval[$check][$key])) {
               
$retval[$check][$key] = '';
            }
        }
    }

    return(
$retval);
}
?>
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0
Anonymous
6 years ago
To check if there were any results found you have to use the empty() function.  The count() function always returns a number 1 or larger.

     $walk_result = snmprealwalk($machine_ip, $community, $snmpcodes['interface_names']);

    if (empty($walk_result)) {
        print "No network interfaces found.<br>\n";
        exit(0);
    }
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0
scot at indievisible dot org
8 years ago
Some improvements based on testing a lot of OIDs on a lot of devices.

<?php
function snmptable($host, $community, $oid) {
   
// TODO: get original state and restore at bottom
   
snmp_set_oid_numeric_print(TRUE);
   
snmp_set_quick_print(TRUE);
   
snmp_set_enum_print(TRUE);

   
$retval = array();
   
$raw = snmprealwalk($host, $community, $oid);
    if (
count($raw) == 0) return ($retval); // no data
   
   
$prefix_length = 0;
   
$largest = 0;
    foreach (
$raw as $key => $value) {
        if (
$prefix_length == 0) {
           
// don't just use $oid's length since it may be non-numeric
           
$prefix_elements = count(explode('.',$oid));
           
$tmp = '.' . strtok($key, '.');
            while (
$prefix_elements > 1) {
               
$tmp .= '.' . strtok('.');
               
$prefix_elements--;
            }
           
$tmp .= '.';
           
$prefix_length = strlen($tmp);
        }
       
$key = substr($key, $prefix_length);
       
$index = explode('.', $key, 2);
        isset(
$retval[$index[1]]) or $retval[$index[1]] = array();
        if (
$largest < $index[0]) $largest = $index[0];
       
$retval[$index[1]][$index[0]] = $value;
    }

    if (
count($retval) == 0) return ($retval); // no data

    // fill in holes and blanks the agent may "give" you
   
foreach($retval as $k => $x) {
        for (
$i = 1; $i <= $largest; $i++) {
        if (! isset(
$retval[$k][$i])) {
               
$retval[$k][$i] = '';
            }
        }
       
ksort($retval[$k]);
    }
    return(
$retval);
}
?>
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0
railson at amixsi dot com dot br
8 years ago
Attention: timeout is in microseconds (multiply by 1,000,000 for seconds)
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0
Stephen Cope
9 years ago
Here's a way to find the uptime and number of users on a machine. (Note that uptime is the uptime of the snmpd daemon, which should be fairly close to the uptime for the host.)

<?php
        $state
= snmprealwalk($host, "public", ".1.3.6.1.2.1.25.1", 50, 1);
       
$uptime = ereg_replace("^.*\) ([0-9]+ .*):[0-9][0-9]\.[0-9]{2}.*$", "\\1", $state['host.hrSystem.hrSystemUptime.0']);
       
$users  = (int)ereg_replace("Gauge32: ", "", $state['host.hrSystem.hrSystemNumUsers.0']);
       
printf('<div class="machine"><dt>%s</dt><dd>%s</dd>', $host, $desc);
       
printf('<dd>up %s</dd>', $uptime);
        if (
$users ) printf('<dd>%d user%s</dd>', $users, ($users > 1) ? 's' : '');
       
printf('</div>');
?>
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0
Lars Troen
11 years ago
snmprealwalk indexes the values using the oid instead of an integer. This is useful when you need data that is contained in the oid as well as the value.

Here's an example for retrieving and printing vlan info:
//
// I have collected the vlan identifiers earlier from the 3com mib and they are stored in the $vlan table.
//
  for($n=0;$n<count($vlan);$n++){
    print $vlan[$n][id]."  ".$vlan[$n][name]."<br>\n";
    $ifStackStatusTable=@snmprealwalk($switch, $community, ".1.3.6.1.2.1.31.1.2.1.3.".$vlan[$n][id]); // ifMIB.ifMIBObjects.ifStackTable.ifStackEntry.ifStackStatus
    for(reset($ifStackStatusTable);  $port = key($ifStackStatusTable);  next($ifStackStatusTable)){
      print "$port=$ifStackStatusTable[$port]<br>";
      }
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-1
aleksander dot sztramski at kpsi dot pl
5 years ago
If you wish to use version 2c or 3, use the following functions:

snmp v2c functions:

snmp2_get (string host, string community, string object_id [, int timeout [, int retries]])
snmp2_getnext (string host, string community, string object_id [, int timeout [, int retries]])
snmp2_walk (string host, string community, string object_id [, int timeout [, int retries]])
snmp2_real_walk (string host, string community, string object_id [, int timeout [, int retries]])
snmp2_set (string host, string community, string object_id, string type, mixed value [, int timeout [, int retries]])

snmp v3 functions:

snmp3_get (string host, string sec_name, string sec_level, string auth_protocol, string auth_passphrase, string priv_pr)
snmp3_getnext (string host, string sec_name, string sec_level, string auth_protocol, string auth_passphrase, string pri)
snmp3_walk (string host, string sec_name, string sec_level, string auth_protocol, string auth_passphrase, string priv_p)
snmp3_real_walk (string host, string sec_name, string sec_level, string auth_protocol, string auth_passphrase, string p)
snmp3_set (string host, string sec_name, string sec_level, string auth_protocol, string auth_passphrase, string priv_pr)
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