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snmp-scan.php
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snmp-scan.php
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#!/usr/bin/env php
<?php
/*
* Copyright (C) 2015 Daniel Preussker <f0o@librenms.org>
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
/**
* SNMP Scan
* @author f0o <f0o@librenms.org>
* @copyright 2015 f0o, LibreNMS
* @license GPL
* @package LibreNMS
* @subpackage Discovery
*/
use LibreNMS\Exceptions\HostExistsException;
use LibreNMS\Exceptions\HostUnreachableException;
use LibreNMS\Exceptions\HostUnreachablePingException;
chdir(__DIR__); // cwd to the directory containing this script
$ts = microtime(true);
require 'includes/defaults.inc.php';
require 'config.php';
require 'includes/definitions.inc.php';
require 'includes/functions.php';
require 'includes/discovery/functions.inc.php';
if ($config['autodiscovery']['snmpscan'] === false) {
echo 'SNMP-Scan disabled.'.PHP_EOL;
exit(2);
}
function perform_snmp_scan($net, $force_network, $force_broadcast)
{
global $stats, $config, $debug, $vdebug;
echo 'Range: '.$net->network.'/'.$net->bitmask.PHP_EOL;
$config['snmp']['timeout'] = 1;
$config['snmp']['retries'] = 0;
$config['fping_options']['retries'] = 0;
$start = ip2long($net->network);
$end = ip2long($net->broadcast)-1;
if ($force_network === true) { //Force-scan network address
d_echo("Forcing network address scan".PHP_EOL);
$start = $start-1;
}
if ($force_broadcast === true) { //Force-scan broadcast address
d_echo("Forcing broadcast address scan".PHP_EOL);
$end = $end+1;
}
if ($net->bitmask === "31") { //Handle RFC3021 /31 prefixes
$start = ip2long($net->network)-1;
$end = ip2long($net->broadcast);
d_echo("RFC3021 network, hosts ".long2ip($start+1)." and ".long2ip($end).PHP_EOL.PHP_EOL);
} elseif ($net->bitmask === "32") { //Handle single-host /32 prefixes
$start = ip2long($net->network)-1;
$end = $start+1;
d_echo("RFC3021 network, hosts ".long2ip($start+1)." and ".long2ip($end).PHP_EOL.PHP_EOL);
} else {
d_echo("Network: ".($net->network).PHP_EOL);
d_echo("Broadcast: ".($net->broadcast).PHP_EOL.PHP_EOL);
}
while ($start++ < $end) {
$stats['count']++;
$host = long2ip($start);
if ($vdebug) {
echo "Scanning: ".$host.PHP_EOL;
}
if (match_network($config['autodiscovery']['nets-exclude'], $host)) {
if ($vdebug) {
echo "Excluded by config.php".PHP_EOL.PHP_EOL;
} else {
echo '|';
}
continue;
}
$test = isPingable($host);
if ($test['result'] === false) {
if ($vdebug) {
echo "Unpingable Device".PHP_EOL.PHP_EOL;
} else {
echo '.';
}
continue;
}
if (ip_exists($host)) {
$stats['known']++;
if ($vdebug) {
echo "Known Device".PHP_EOL;
} else {
echo '*';
}
continue;
}
foreach (array('udp','tcp') as $transport) {
try {
addHost(gethostbyaddr($host), '', $config['snmp']['port'], $transport, $config['distributed_poller_group']);
$stats['added']++;
if ($vdebug) {
echo "Added Device".PHP_EOL.PHP_EOL;
} else {
echo '+';
}
break;
} catch (HostExistsException $e) {
$stats['known']++;
if ($vdebug) {
echo "Known Device".PHP_EOL.PHP_EOL;
} else {
echo '*';
}
break;
} catch (HostUnreachablePingException $e) {
if ($vdebug) {
echo "Unpingable Device".PHP_EOL.PHP_EOL;
} else {
echo '.';
}
break;
} catch (HostUnreachableException $e) {
if ($debug) {
print_error($e->getMessage() . " over $transport");
foreach ($e->getReasons() as $reason) {
echo " $reason".PHP_EOL;
}
}
if ($transport === 'tcp') {
// tried both udp and tcp without success
$stats['failed']++;
if ($vdebug) {
echo "Failed to Add Device".PHP_EOL.PHP_EOL;
} else {
echo '-';
}
}
}
}
}
echo PHP_EOL;
}
$opts = getopt('r:d::v::n::b::l::h::');
$stats = array('count'=> 0, 'known'=>0, 'added'=>0, 'failed'=>0);
$start = false;
$debug = false;
$quiet = 1;
$net = false;
if (isset($opts['h']) || (empty($opts) && (!isset($config['nets']) || empty($config['nets'])))) {
echo 'Usage: '.$argv[0].' -r <CIDR_Range> [-d] [-l] [-h]'.PHP_EOL;
echo ' -r CIDR_Range CIDR noted IP-Range to scan'.PHP_EOL;
echo ' This argument is only required if $config[\'nets\'] is not set'.PHP_EOL;
echo ' Example: 192.168.0.0/24'.PHP_EOL;
echo ' Example: 192.168.0.0/31 will be treated as an RFC3021 p-t-p network'.PHP_EOL;
echo ' with two addresses, 192.168.0.0 and 192.168.0.1'.PHP_EOL;
echo ' Example: 192.168.0.1/32 will be treated as a single host address'.PHP_EOL;
echo ' -n Force scan of network address'.PHP_EOL;
echo ' -b Force scan of broadcast address'.PHP_EOL;
echo ' -d Enable Debug'.PHP_EOL;
echo ' -v Enable verbose Debug'.PHP_EOL;
echo ' -l Show Legend'.PHP_EOL;
echo ' -h Print this text'.PHP_EOL;
exit(0);
}
if (isset($opts['d']) || isset($opts['v'])) {
if (isset($opts['v'])) {
$vdebug = true;
}
$debug = true;
}
if (isset($opts['l'])) {
echo ' * = Known Device; . = Unpingable Device; + = Added Device; - = Failed To Add Device; | = Excluded by config.php'.PHP_EOL;
}
if (isset($opts['n'])) {
$force_network = true;
}
if (isset($opts['b'])) {
$force_broadcast = true;
}
if (isset($opts['r'])) {
$net = Net_IPv4::parseAddress($opts['r']);
if (ip2long($net->network) !== false) {
perform_snmp_scan($net, $force_network, $force_broadcast);
echo 'Scanned '.$stats['count'].' IPs, Already known '.$stats['known'].' Devices, Added '.$stats['added'].' Devices, Failed to add '.$stats['failed'].' Devices.'.PHP_EOL;
echo 'Runtime: '.(microtime(true)-$ts).' secs'.PHP_EOL;
} else {
echo 'Could not interpret supplied CIDR noted IP-Range: '.$opts['r'].PHP_EOL;
exit(2);
}
} elseif (isset($config['nets']) && !empty($config['nets'])) {
if (!is_array($config['nets'])) {
$config['nets'] = array( $config['nets'] );
}
foreach ($config['nets'] as $subnet) {
$net = Net_IPv4::parseAddress($subnet);
perform_snmp_scan($net, $force_network, $force_broadcast);
}
echo 'Scanned '.$stats['count'].' IPs, Already know '.$stats['known'].' Devices, Added '.$stats['added'].' Devices, Failed to add '.$stats['failed'].' Devices.'.PHP_EOL;
echo 'Runtime: '.(microtime(true)-$ts).' secs'.PHP_EOL;
} else {
echo 'Please either add a range argument with \'-r <CIDR_RANGE>\' or define $config[\'nets\'] in your config.php'.PHP_EOL;
exit(2);
}