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#!/usr/bin/python -tt
# CloudKick Plugin to see who's logged into the system.
# By default, assumes that no one should be logged into the system.
# Can specify --min and --max to adjust the acceptable range.
# If number of users outside of the acceptable range, a warning
# is raised. If inside the acceptable range, an ok status is raised.
# Copyright (C) 2011 James Bair <>
# 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 2
# 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
# 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, write to the Free Software Foundation,
# Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
import commands
import sys
from optparse import OptionParser
def getUsersLoggedIn():
Find all users that are logged
into the local system and return
either a list or a None object.
# Best way I can find to find users logged in
commStatus, userData = commands.getstatusoutput('who')
# Make sure it exits gracefully
if commStatus != 0:
sys.stderr.write('status err Unable to execute "who" command.\n')
# "who" returns an empty string if no one is logged in
if userData == '':
users = None
# We're going to add each user we find to a list
users = []
# Split up our string by lines
userLines = userData.split('\n')
for line in userLines:
# Username should be the first item on the line
return users
def main():
Main function for
parser = OptionParser()
parser.add_option("-m", "--min",
action="store", type="int",
help="Minimum number of users", metavar="N")
parser.add_option("-M", "--max",
action="store", type="int",
help="Maximum number of users", metavar="N")
(options, args) = parser.parse_args()
# Overwrite default values if they exist
# Specify "not None" since 0 will return False
if options.min is not None:
minUsers = options.min
if options.max is not None:
maxUsers = options.max
# If only min users is passed, make them match.
# If both are passed, then this is a user error.
if minUsers > maxUsers:
if options.min is not None and options.max is not None:
msg = "Error: --min cannot exceed --max\n"
maxUsers = minUsers
# Find our users
users = getUsersLoggedIn()
# If object is None, no users logged in.
if users is None:
userMsg="No users logged in."
userNum = 0
# Anything else, we have users
# Find out the number of users and
#if we're saying "user" or "users"
userNum = len(users)
if userNum == 1:
userWord = 'user'
userWord = 'users'
# Build our users logged in message.
userMsg = "%d %s logged in: " % (userNum, userWord)
userMsg = userMsg + ", ".join(users)
# Plugin spec limits status string to 48 chars.
# I have tested with over 100 chars and CloudKick
# works just fine. Adjust/remove as you see fit, but
# for the sake of being "correct", this line is here.
userMsg = userMsg[:48]
# Now, find out if we are in error or not
if userNum < minUsers or userNum > maxUsers:
statusMsg = 'status warn'
statusMsg = 'status ok'
# All done, build our strings and repot the data
ourStatus = '%s %s\n' % (statusMsg, userMsg)
# And build our number of users
ourMetric = "metric users_logged_in int %d\n" % (userNum,)
# All done.
sys.stdout.write(ourStatus + ourMetric)
# Let's do this
if __name__ == '__main__':