PHP之SNMP函数：snmpget/snmp2_get/snmp3_get

PHP之SNMP函数：snmpget/snmp2_get/snmp3_get

snmpget/snmp2_get/snmp3_get
说明：获取一个 SNMP 对象(snmpget：php4/5；snmp2_get:php5>=5.2.0；snmp3_get:php4/5)

string snmpget ( string $hostname , string $community , string $object_id [, int $timeout [, int $retries ]] )

string snmp2_get ( string $host , string $community , string $object_id [, string $timeout = 1000000 [, string $retries = 5 ]] )

string snmp3_get ( string $host , string $sec_name , string $sec_level , string $auth_protocol , string $auth_passphrase , string $priv_protocol , string $priv_passphrase , string $object_id [, string $timeout = 1000000 [, string $retries = 5 ]] )

示例1：snmpget()

<?php
$syscontact = snmpget("localhost","public","sysContact.0");
$sysname = snmpget("localhost","public","sysName.0");
echo $syscontact;
echo "\r\n";
echo $sysname;
echo "\r\n";
?>

输出结果：
     STRING: MAOS (configure /etc/snmp/snmp.local.conf)
     STRING: enochost


示例2：snmp3_get()

点击(此处)折叠或打开

<?php
$nameOfSecondInterface = snmp3_get('localhost', 'james', 'authPriv', 'SHA', 'secret007', 'AES', 'secret007', 'IF-MIB::ifName.2');
var_dump($nameOfSecondInterface);
?>

示例3: snmp2_get()

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<?php
    function get_server_info($host,$snmpkey,$oid){
            $c = snmp2_get($host,$snmpkey,$oid);
    //      echo $c;
            $tmp = explode(":",$c);
    //      var_dump($tmp);
            if(count($tmp)>1){$c = trim($tmp[1]);}
            return $c;
    }
    $host="localhost";
    $snmpkey="public";
    $load1 = get_server_info($host,$snmpkey,".1.3.6.1.4.1.2021.10.1.3.1");
    echo $load1;
    $sysDescr = get_server_info($host,$snmpkey,".1.3.6.1.2.1.1.1.0");
    echo $sysDescr;
    ?>

说明：
1. 定义一个function get_server_info(),通过snmp2_get()取出相应的字串存入$c中，通过"："分割$c存入数组$tmp，如果$tmp数组有多个值，截取$tmp数组的第二个值(下标为1)存回$c，并返回$c的值；
2. 可以去除注释来查看理解函数的执行过程；


示例4：一个适应snmp各个版本的封装类(wrapper class),

点击(此处)折叠或打开

<?php
class SNMP_Wrapper {
    protected $_host;
    protected $_community;
    protected $_version;

    public function __construct($host='localhost',$community='public',$version=1)
    {
        $this->_host = $host;
        $this->_community = $community;
        switch ($version) {
            case 2:
                $this->_version = '2';
                break;
            case 3:
                $this->_version = '3';
            default:
                $this->_version = '';
                break;
        }
    }

    public function __call($func,$args)
    {
        $func = strtolower(preg_replace('/([A-Z])/', '_$1', $func));
        $function = 'snmp' . $this->_version . (empty($this->_version) ? '' : '_') . $func;
        if (function_exists($function)) {
            return call_user_func_array($function, array_merge(array($this->_host,$this->_community),$args));
        }
    }
}

// Testing it
$snmp = new SNMP_Wrapper('localhost','public','2');
print_r($snmp->realWalk('IF-MIB::ifName'));
?>