c7bca97633
Check to get IP address from interface make sure that one or more DNS entries point to this IP adress. Use it to check DynDNS services. Signed-off-by: Sven Velt <sven@velt.de>
93 lines
2.9 KiB
Python
Executable file
93 lines
2.9 KiB
Python
Executable file
#!/usr/bin/python
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from monitoringplugin import MonitoringPlugin
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import fcntl
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import socket
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import struct
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def get_ipv4_address(iface):
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sock = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
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return socket.inet_ntoa(fcntl.ioctl(sock.fileno(), 0x8915, struct.pack('256s', iface[:15]))[20:24])
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plugin = MonitoringPlugin(pluginname='check_iface-dns', tagforstatusline='IFACE-DNS', description='Check interface address vs. DNS', version='0.1')
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plugin.add_cmdlineoption('-i', '', 'iface', 'Interface to get IP from', default='lo')
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plugin.add_cmdlineoption('-d', '', 'dns', 'DNS object(s) to check, comma separated list', default='localhost')
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#plugin.add_cmdlineoption('-4', '', 'v4', 'Use IPv4', action='store_true')
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#plugin.add_cmdlineoption('-6', '', 'v6', 'Use IPv6', action='store_true')
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plugin.parse_cmdlineoptions()
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#if not plugin.options.v4 and not plugin.options.v6:
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# plugin.options.v4 = True
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#
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#if plugin.options.v4:
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# plugin.verbose(1, 'Using IPv4')
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#
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#if plugin.options.v6:
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# plugin.verbose(1, 'Using IPv6')
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# Get IP from interface
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try:
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ip_iface = get_ipv4_address(plugin.options.iface)
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except IOError, (errno, strerror):
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if errno == 19:
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plugin.back2nagios(2, 'Interface "%s" does not exist!' % plugin.options.iface)
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elif errno == 99:
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plugin.back2nagios(2, 'Interface "%s" has no IP!' % plugin.options.iface)
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plugin.back2nagios(2, 'I/O error(%s): %s, interface "%s"' % (errno, strerror, plugin.options.iface))
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plugin.verbose(1, 'Found IP "%s" on interface "%s"' % (ip_iface, plugin.options.iface))
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# Get IP(s) from DNS
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if not ',' in plugin.options.dns:
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# Only one DNS object
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try:
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ip_dns = socket.gethostbyname(plugin.options.dns)
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except socket.gaierror:
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ip_dns = None
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plugin.back2nagios(1, 'Could not find "%s" in DNS!' % plugin.options.dns)
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if ip_iface == ip_dns:
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plugin.back2nagios(0, 'Found %s for "%s" in DNS and on interface "%s"' % (ip_dns, plugin.options.dns, plugin.options.iface))
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else:
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plugin.back2nagios(2, 'Found %s for "%s" in DNS, but %s for interface "%s"' % (ip_dns, plugin.options.dns, ip_iface, plugin.options.iface))
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else:
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# Multiple DNS objects
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plugin.add_returncode(0)
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failed_dns = []
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for dns in plugin.options.dns.split(','):
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try:
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ip_dns = socket.gethostbyname(dns)
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except socket.gaierror:
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ip_dns = None
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if ip_dns:
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plugin.verbose(1, 'Found IP "%s" as DNS object "%s"' % (ip_dns, dns))
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else:
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plugin.verbose(1, 'Did not find IP for "%s"' % dns)
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if ip_iface != ip_dns:
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plugin.add_multilineoutput('CRITICAL - "%s" has unexpected IP "%s"' % (dns, ip_dns))
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failed_dns.append(dns)
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else:
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plugin.add_multilineoutput('OK - "%s" resolves to "%s"' % (dns, ip_dns))
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if len(failed_dns) == 0:
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plugin.add_returncode(0)
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plugin.add_output('All DNS objects have a correct IP')
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else:
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plugin.add_returncode(2)
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plugin.add_output('Following DNS objects did not resolve as expected: "%s"' % '", "'.join(failed_dns))
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plugin.exit()
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