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https://github.com/librenms/librenms.git
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100 lines
2.6 KiB
PHP
100 lines
2.6 KiB
PHP
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<?php
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//
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// Observium module to do device discovery by ARP table contents.
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//
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// Needs to be run after the ARP table discovery, because it uses the
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// data gathered by the ARP table discovery module. Keeps a cache of
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// seen hosts, and will not attempt re-discovery of the same IP (whether
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// discovery failed or succeed) during the same discovery run.
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//
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// Copyright (c) 2012-2013 Gear Consulting Pty Ltd <http://libertysys.com.au/>
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//
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// Author: Paul Gear <observium@libertysys.com.au>
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// License: GPLv3
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//
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include_once("../../includes/print-interface.inc.php");
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echo("ARP Discovery: ");
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$hostname = $device['hostname'];
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$deviceid = $device['device_id'];
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// Find all IPv4 addresses in the MAC table that haven't been discovered on monitored devices.
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$sql = "
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SELECT *
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FROM ip_mac as m, ports as i
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WHERE m.port_id = i.port_id
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AND i.device_id = ?
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AND i.deleted = 0
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AND NOT EXISTS (
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SELECT * FROM ipv4_addresses a
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WHERE a.ipv4_address = m.ip_address
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)
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GROUP BY ip_address
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ORDER BY ip_address
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";
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unset($names);
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unset($ips);
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foreach (dbFetchRows($sql, array($deviceid)) as $entry)
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{
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global $config;
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$ip = $entry['ip_address'];
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$mac = $entry['mac_address'];
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$if = $entry['port_id'];
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$int = humanize_port($if);
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$label = $int['label'];
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// Even though match_network is done inside discover_new_device, we do it here
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// as well in order to skip unnecessary reverse DNS lookups on discovered IPs.
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if (match_network($config['autodiscovery']['nets-exclude'], $ip)) {
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echo("x");
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continue;
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}
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if (!match_network($config['nets'], $ip)) {
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echo("i");
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log_event("Ignored $ip", $deviceid, 'interface', $if);
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continue;
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}
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// Attempt discovery of each IP only once per run.
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if (arp_discovery_is_cached($ip)) {
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echo(".");
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continue;
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}
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arp_discovery_add_cache($ip);
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// Log reverse DNS failures so the administrator can take action.
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$name = gethostbyaddr($ip);
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if ($name != $ip) { // gethostbyaddr returns the original argument on failure
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echo("+");
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$names[] = $name;
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$ips[$name] = $ip;
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}
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else {
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echo("-");
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log_event("ARP discovery of $ip failed due to absent reverse DNS", $deviceid, 'interface', $if);
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}
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}
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echo("\n");
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// Run device discovery on each of the devices we've detected so far.
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foreach ($names as $name) {
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$remote_device_id = discover_new_device($name);
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if ($remote_device_id) {
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log_event("Device autodiscovered through ARP on $hostname", $remote_device_id, 'interface', $if);
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}
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else {
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log_event("ARP discovery of $name (" . $ips[$name] . ") failed - check ping and SNMP access", $deviceid, 'interface', $if);
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}
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}
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unset($names);
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unset($ips);
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?>
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