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<?php defined('SYSPATH') or die('No direct script access.');
/*
* This file is part of open source system FreenetIS
* and it is released under GPLv3 licence.
*
* More info about licence can be found:
* http://www.gnu.org/licenses/gpl-3.0.html
*
* More info about project can be found:
* http://www.freenetis.org/
*
*/

/**
* Linux SNMP driver.
* This class MUST not be initialized directly, use Snmp_Factory!
*
* @author Ondrej Fibich
* @see Abstract_Snmp
*/
class Linux_Snmp extends Abstract_Snmp
{
/**
* Checks if the driver is compactible with the driver.
*
* @param string $device_ip Device IP address
* @return bool Is compactible?
*/
public function isCompactibleDriverWith($device_ip)
{
if (!valid::ip($device_ip))
{
throw new InvalidArgumentException('Wrong IP address of the device');
}
try
{
$this->startErrorHandler();
$row = snmp2_get(
$device_ip, $this->comunity, 'iso.3.6.1.2.1.1.1.0',
$this->timeout, $this->retries
);
$this->stopErrorHandler();
}
catch (Exception $e)
{
return FALSE;
}
// parse result
$matches = array();
if (preg_match('/STRING: "?(.*)"?/', $row, $matches) > 0)
{
return text::starts_with($matches[1], 'Linux') ||
text::starts_with($matches[1], 'S6720'); // Huawei switch
}
else
{
return FALSE;
}
}
/**
* Obtain MAC address of a device with the given IP address from ARP table.
*
* @param string $device_ip IP address of the device (we would like to know his MAC)
* @return string MAC address in format xx:xx:xx:xx:xx:xx
* @throws Exception On SNMP error or wrong SNMP response
* @throws InvalidArgumentException On wrong IP address
*/
public function getARPMacAddressOf($device_ip)
{
if (!valid::ip($device_ip))
{
throw new InvalidArgumentException('Wrong IP address of the device');
}

// obtain
$this->startErrorHandler();
$arp_table = snmp2_real_walk(
$this->deviceIp, $this->comunity, 'iso.3.6.1.2.1.3.1.1.2',
$this->timeout, $this->retries
);
$this->stopErrorHandler();
// parse result
$regex = '/Hex-STRING: (([0-9a-fA-F]{2}\s){5}[0-9a-fA-F]{2})/';
$matches = array();
foreach ($arp_table as $key => $val)
{
if (text::ends_with($key, '.' . $device_ip) &&
preg_match($regex, $val, $matches))
{
return mb_strtolower(str_replace(' ', ':', $matches[1]));
}
}
throw new Exception('Given IP address ' . $device_ip
. ' not in ARP table on ' . $this->deviceIp);
}
/**
* Obtain MAC address of a device with the given IP address from DHCP server.
*
* @param string $device_ip IP address of the device (we would like to know his MAC)
* @return string MAC address in format xx:xx:xx:xx:xx:xx
* @throws Exception On SNMP error or wrong SNMP response
* @throws InvalidArgumentException On wrong IP address
*/
public function getDHCPMacAddressOf($device_ip)
{
if (!valid::ip($device_ip))
{
throw new InvalidArgumentException('Wrong IP address of the device');
}
try
{
// obtain
$this->startErrorHandler();
$row = snmp2_get(
$this->deviceIp, $this->comunity,
'iso.3.6.1.2.1.9999.1.1.6.4.1.8.' . $device_ip,
$this->timeout, $this->retries
);
$this->stopErrorHandler();
}
catch (Exception $e)
{
throw new DHCPMacAddressException($e->getTraceAsString());
}
// parse result
$regex = '/STRING: "(([0-9a-fA-F]{2}\s){5}[0-9a-fA-F]{2})"/';
$matches = array();
if (preg_match($regex, $row, $matches) > 0)
{
return mb_strtolower(str_replace(' ', ':', $matches[1]));
}
else
{
throw new DHCPMacAddressException('Invalid SMNP output during obtaning of MAC address: ' . $row);
}
}
/**
* Obtaint port number with given MAC address.
*
* @param string $mac_address MAC address of the device (we would like to know to which port is connected)
* @return string MAC address in format xx:xx:xx:xx:xx:xx
* @throws Exception On SNMP error or wrong SNMP response
* @throws InvalidArgumentException On wrong IP address
*/
public function getPortNumberOf($mac_address)
{
// is not possible
return FALSE;
}
}
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