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356 lines
12 KiB
Python
356 lines
12 KiB
Python
#!/usr/bin/python
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"""
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Munin plugin to monitor various items of data from an Apple Airport
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Express/Extreme or a Time Capsule.
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v1.0 by Chris Jones <cmsj@tenshu.net>
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Copyright (C) 2011 Chris Jones
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This script is released under the GNU GPL v2 license.
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To use this plugin, use specially named symlinks:
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cd /etc/munin/plugins
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ln -s /path/to/snmp__airport snmp_myairport_airport_clients
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ln -s /path/to/snmp__airport snmp_myairport_airport_dhcpclients
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ln -s /path/to/snmp__airport snmp_myairport_airport_rate
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ln -s /path/to/snmp__airport snmp_myairport_airport_signal
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ln -s /path/to/snmp__airport snmp_myairport_airport_noise
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NOTE: the name 'myairport' should be a valid hostname or IP address for your
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Airport. It can be any value, but it must not include the character '_'.
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Now add a virtual host entry to your munin server's munin.conf:
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[myairport]
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address 123.123.123.123
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user_node_name no
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(with the correct IP address, obviously)
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this will create a virtual host in munin for the airport named 'myairport' and
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produce graphs for:
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* number of connected wireless clients
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* number of active DHCP leases
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* rate at which clients are connected (in Mb/s)
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* signal quality of connected clients (in dB)
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* noise level of connected clients (in dB)
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# Magic markers
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#%# capabilities=
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#%# family=contrib manual
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"""
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import sys
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import os
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try:
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import netsnmp
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except ImportError:
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print """ERROR: Unable to import netsnmp.
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Please install the Python bindings for libsnmp.
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On Debian/Ubuntu machines this package is named 'libsnmp-python'"""
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sys.exit(-3)
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DEBUG=None
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CMDS=['type', 'rates', 'time', 'lastrefresh', 'signal', 'noise', 'rate', 'rx',
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'tx', 'rxerr', 'txerr']
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CMD=None
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DESTHOST=None
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NUMCLIENTS=None
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NUMDHCPCLIENTS=None
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WANIFINDEX=None
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def dbg(text):
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"""Print some debugging text if DEBUG=1 is in our environment"""
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if DEBUG is not None:
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print "DEBUG: %s" % text
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def usage():
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"""Print some usage information about ourselves"""
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print __doc__
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def parseName(name):
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"""Examing argv[0] (i.e. the name of this script) for the hostname we should
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be talking to and the type of check we want to run. The hostname should be
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a valid, resolvable hostname, or an IP address. The command can be any of:
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* clients - number of connected wireless clients
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* signal - dB reported by the wireless clients for signal strength
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* noise - dB reported by the wireless clients for noise level
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* rate - Mb/s rate the wireless clients are connected at
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The name should take the form snmp_HOSTORIP_airport_COMMAND
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"""
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bits = name.split('_')
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if len(bits) >= 4:
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destHost = bits[1]
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cmd = bits[3]
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dbg("parseName split '%s' into '%s'/'%s'" % (name, destHost, cmd))
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return (destHost, cmd)
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else:
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dbg("parseName found an inconsistent name: '%s'" % name)
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return None
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def tableToDict(table, num):
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"""The netsnmp library returns a tuple with all of the data, it is not in any
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way formatted into rows. This function converts the data into a structured
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dictionary, with each key being the MAC address of a wireless client. The
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associated value will be a dictionary containing the information available
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about the client:
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* type - 1 = sta, 2 = wds
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* rates - the wireless rates available to the client
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* time - length of time the client has been connected
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* lastrefresh - time since the client last refreshed
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* signal - dB signal strength reported by the client (or -1)
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* noise - dB noise level reported by the client (or -1)
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* rate - Mb/s rate the client is connected at
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* rx - number of packets received by the client
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* tx - number of packets transmitted by the client
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* rxerr - number of error packets received by the client
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* txerr - number of error packets transmitted by the client
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"""
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table = list(table)
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clients = []
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clientTable = {}
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# First get the MACs
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i = num
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while i > 0:
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data = table.pop(0)
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clients.append(data)
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clientTable[data] = {}
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dbg("tableToDict: found client '%s'" % data)
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i = i - 1
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for cmd in CMDS:
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i = 0
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while i < num:
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data = table.pop(0)
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clientTable[clients[i]][cmd] = data
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dbg("tableToDict: %s['%s'] = %s" % (clients[i], cmd, data))
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i = i + 1
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return clientTable
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def getNumClients():
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"""Returns the number of wireless clients connected to the Airport we are
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examining. This will only ever be polled via SNMP once per invocation. If
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called a second time, it will just return the first value it found. This is
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intended to be an optimisation to reduce SNMP roundtrips because this script
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should not be long-running"""
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global NUMCLIENTS
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wirelessNumberOID = '.1.3.6.1.4.1.63.501.3.2.1.0'
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# Dumbly cache this so we only look it up once.
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if NUMCLIENTS is None:
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NUMCLIENTS = int(netsnmp.snmpget(netsnmp.Varbind(wirelessNumberOID),
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Version=2, DestHost=DESTHOST,
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Community='public')[0])
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dbg("getNumClients: polled SNMP for client number")
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dbg("getNumClients: found %d clients" % NUMCLIENTS)
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return NUMCLIENTS
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def getNumDHCPClients():
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"""Returns the number of DHCP clients with currently active leases. This
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will only ever be polled via SNMP once per invocation. If called a second
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time, it will just return the first value it found. This is intended to be
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an optimisation to reduce SNMP roundtrips because this script should not be
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long-running"""
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global NUMDHCPCLIENTS
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dhcpNumberOID = '.1.3.6.1.4.1.63.501.3.3.1.0'
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# Dumbly cache this so we only look it up once.
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if NUMDHCPCLIENTS is None:
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NUMDHCPCLIENTS = int(netsnmp.snmpget(netsnmp.Varbind(dhcpNumberOID),
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Version=2, DestHost=DESTHOST,
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Community='public')[0])
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dbg("getNumDHCPClients: polled SNMP for dhcp client number")
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dbg("getNumDHCPClients: found %d clients" % NUMDHCPCLIENTS)
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return NUMDHCPCLIENTS
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def getExternalInterface():
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"""Returns the index of the WAN interface of the Airport. This will only
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ever be polled via SNMP once per invocation, per getNum*Clients(). See
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above."""
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global WANIFINDEX
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iFaceNames = '.1.3.6.1.2.1.2.2.1.2'
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if WANIFINDEX is None:
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interfaces = list(netsnmp.snmpwalk(netsnmp.Varbind(iFaceNames),
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Version=2, DestHost=DESTHOST,
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Community='public'))
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dbg("getExternalInterface: found interfaces: %s" % interfaces)
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try:
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WANIFINDEX = interfaces.index('mgi1') + 1
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except ValueError:
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print "ERROR: Unable to find WAN interface mgi1"
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print interfaces
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sys.exit(-3)
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dbg("getExternalInterface: found mgi1 at index: %d" % WANIFINDEX)
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return WANIFINDEX
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def getExternalInOctets():
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"""Returns the number of octets of inbound traffic on the WAN interface"""
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return getOctets('In')
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def getExternalOutOctets():
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"""Returns the number of octets of outbound traffic on the WAN interface"""
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return getOctets('Out')
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def getOctets(direction):
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"""Returns the number of octets of traffic on the WAN interface in the
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requested direction"""
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index = getExternalInterface()
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if direction == 'In':
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iFaceOctets = '.1.3.6.1.2.1.2.2.1.10.%s' % index
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else:
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iFaceOctets = '.1.3.6.1.2.1.2.2.1.16.%s' % index
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return int(netsnmp.snmpget(netsnmp.Varbind(iFaceOctets),
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Version=2, DestHost=DESTHOST,
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Community='public')[0])
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def getWanSpeed():
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"""Returns the speed of the WAN interface"""
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ifSpeed = "1.3.6.1.2.1.2.2.1.5.%s" % getExternalInterface()
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dbg("getWanSpeed: OID for WAN interface speed: %s" % ifSpeed)
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try:
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wanSpeed = int(netsnmp.snmpget(netsnmp.Varbind(ifSpeed),
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Version=2, DestHost=DESTHOST,
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Community='public')[0])
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except:
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dbg("getWanSpeed: Unable to probe for data, defaultint to 10000000")
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wanSpeed = 10000000
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return wanSpeed
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def getData():
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"""Returns a dictionary populated with all of the wireless clients and their
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metadata"""
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wirelessClientTableOID = '.1.3.6.1.4.1.63.501.3.2.2.1'
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numClients = getNumClients()
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if numClients == 0:
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# FIXME: what's actually the correct munin plugin behaviour if there is no
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# data to be presented?
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dbg("getData: 0 clients found, exiting")
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sys.exit(0)
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dbg("getData: polling SNMP for client table")
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clientTable = netsnmp.snmpwalk(netsnmp.Varbind(wirelessClientTableOID),
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Version=2, DestHost=DESTHOST,
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Community='public')
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clients = tableToDict(clientTable, numClients)
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return clients
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def main(clients=None):
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"""This function fetches metadata about wireless clients if needed, then
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displays whatever values have been requested"""
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if clients is None and CMD not in ['clients', 'dhcpclients', 'wanTraffic']:
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clients = getData()
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if CMD == 'clients':
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print "clients.value %s" % getNumClients()
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elif CMD == 'dhcpclients':
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print "dhcpclients.value %s" % getNumDHCPClients()
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elif CMD == 'wanTraffic':
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print "recv.value %s" % getExternalInOctets()
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print "send.value %s" % getExternalOutOctets()
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else:
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for client in clients:
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print "MAC_%s.value %s" % (client, clients[client][CMD])
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if __name__ == '__main__':
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clients = None
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if os.getenv('DEBUG') == '1':
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DEBUG = True
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netsnmp.verbose = 1
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else:
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netsnmp.verbose = 0
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BITS = parseName(sys.argv[0])
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if BITS is None:
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usage()
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sys.exit(0)
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else:
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DESTHOST = BITS[0]
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CMD = BITS[1]
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if len(sys.argv) > 1:
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if sys.argv[1] == 'config':
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print """
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graph_category network
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host_name %s""" % DESTHOST
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if CMD == 'signal':
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print """graph_args -l 0 --lower-limit -100 --upper-limit 0
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graph_title Wireless client signal
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graph_scale no
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graph_vlabel dBm Signal"""
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elif CMD == 'noise':
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print """graph_args -l 0 --lower-limit -100 --upper-limit 0
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graph_title Wireless client noise
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graph_scale no
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graph_vlabel dBm Noise"""
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elif CMD == 'rate':
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print """graph_args -l 0 --lower-limit 0 --upper-limit 500
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graph_title Wireless client WiFi rate
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graph_scale no
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graph_vlabel WiFi Rate"""
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elif CMD == 'clients':
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print """graph_title Number of connected clients
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graph_args --base 1000 -l 0
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graph_vlabel number of wireless clients
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graph_info This graph shows the number of wireless clients connected
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clients.label clients
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clients.draw LINE2
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clients.info The number of clients."""
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elif CMD == 'dhcpclients':
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print """graph_title Number of active DHCP leases
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graph_args --base 1000 -l 0
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graph_vlabel number of DHCP clients
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graph_info This graph shows the number of active DHCP leases
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dhcpclients.label leases
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dhcpclients.draw LINE2
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dhcpclients.info The number of leases."""
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elif CMD == 'wanTraffic':
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speed = getWanSpeed()
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print """graph_title WAN interface traffic
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graph_order recv send
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graph_args --base 1000
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graph_vlabel bits in (-) / out (+) per ${graph_period}
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graph_category network
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graph_info This graph shows traffic for the mgi1 network interface
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send.info Bits sent/received by this interface.
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recv.label recv
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recv.type DERIVE
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recv.graph no
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recv.cdef recv,8,*
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recv.max %s
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recv.min 0
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send.label bps
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send.type DERIVE
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send.negative recv
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send.cdef send,8,*
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send.max %s
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send.min 0""" % (speed, speed)
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else:
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print "Unknown command: %s" % CMD
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sys.exit(-2)
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if CMD in ['clients', 'dhcpclients', 'wanTraffic']:
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# This is static, so we sent the .label data above
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pass
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else:
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clients = getData()
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for client in clients:
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print "MAC_%s.label %s" % (client, client)
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sys.exit(0)
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else:
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main(clients)
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