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    snmprealwalk

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

    snmprealwalk — Return all objects including their respective object ID within the specified one

    Description

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

    The snmprealwalk() function is used to traverse over a number of SNMP objects starting from object_id and return not only their values but also their object ids.

    Parameters

    hostname

    The hostname of the SNMP agent (server).

    community

    The read community.

    object_id

    The SNMP object id which precedes the wanted one.

    timeout

    The number of microseconds until the first timeout.

    retries

    The number of times to retry if timeouts occur.

    Return Values

    Returns an associative array of the SNMP object ids and their values on success or false on error. In case of an error, an E_WARNING message is shown.

    Examples

    Example #1 Using snmprealwalk()

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

    The above will output something like: 

    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
    )

    See Also

    • snmpwalk() - Fetch all the SNMP objects from an agent

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    User Contributed Notes 7 notes

    up
    1
    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);
    }
    ?>
    up
    0
    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);
    }
    up
    0
    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>');
    ?>
    up
    0
    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>";
    }
    up
    -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)
    up
    -1
    railson at amixsi dot com dot br
    18 years ago
    Attention: timeout is in microseconds (multiply by 1,000,000 for seconds)
    up
    -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);
    }
    ?>
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