snmprealwalk

(PHP 4, PHP 5, PHP 7, PHP 8)

snmprealwalk — 返回指定的所有对象，包括它们各自的对象 ID

说明

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

snmprealwalk() 函数用于遍历从 object_id 开始的多个 SNMP 对象，不仅返回它们的值，还返回它们的对象 ID。

参数

hostname: SNMP 代理（服务器）的主机名。
community: The read community.
object_id: 在所需对象之前的 SNMP 对象 ID。
timeout: 第一次超时前的微秒数。
retries: 发生超时时重试的次数。

返回值

成功时返回 SNMP 对象 ID 及其值的关联数组，错误时返回 false。如果出现错误，将显示一条 E_WARNING 消息。

示例

示例 #1 使用 snmprealwalk()

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

以上将输出如下内容：

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
    )

参见

snmpwalk() - 从代理获取所有 SNMP 对象

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用户贡献的备注 7 notes

down

scot at indievisible dot org ¶

18 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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Anonymous ¶

16 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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Stephen Cope ¶

20 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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Lars Troen ¶

21 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>";
      }

down

-1

aleksander dot sztramski at kpsi dot pl ¶

15 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)

down

-1

railson at amixsi dot com dot br ¶

18 years ago

Attention: timeout is in microseconds (multiply by 1,000,000 for seconds)

down

-2

scot at indievisible dot org ¶

18 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);
}
 ?>