#!/usr/bin/python
#
# chack_qmail_processed : Nagios agent to check how many e-mail are processed by qmail.
#
# The MIT License (MIT)
#
# Copyright (c) 2016 Antoine Pernot <antoine.pernot@group.leguide.com>
#
# Permission is hereby granted, free of charge, to any person obtaining
# a copy of this software and associated documentation files (the
# "Software"), to deal in the Software without restriction, including
# without limitation the rights to use, copy, modify, merge, publish,
# distribute, sublicense, and/or sell copies of the Software, and to
# permit persons to whom the Software is furnished to do so, subject to
# the following conditions:
#
# The above copyright notice and this permission notice shall be included
# in all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
# EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
# MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
# IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
# CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
# TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
# SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

import sys
import time
import getopt
import os




qmail_log_path = '/var/log/qmail/qmail-send/current'
delai = 600 # In seconds




def usage():
    print "Usage : "
    print "  check_qmail_proceed -w <WARNING_LEVEL> -c <CRITICAL_LEVEL>"
    print "Warning and critical level is a ratio in percent of failed delveried emails"
    print " and successful deliveried emails. "

def tai64_unix(time):
    return int(str(time).replace('@','')[8:16], 16)-28

def unix_tai64(time):
    return '4000000' + str(hex(int(time)+28)).replace('x','')

try:
    opts, args = getopt.getopt(sys.argv[1:], "w:c:h", ["warning=","critical=","help"])
except getopt.GetoptError:
    print "Invalid argument. "
    usage()
    sys.exit(3)

warning_level = -1
critical_level = -1

for opt,arg in opts:
    if opt in ("-w", "--warning"):
        try:
            warning_level = int(arg)
        except ValueError:
            print "Warning level must be an integer (ex. 20 for 20%). "
            sys.exit(3)
    elif opt in ("-c", "--critical"):
        try:
            critical_level = int(arg)
        except ValueError:
            print "Critical level must be an integer (ex. 20 for 20%). "
            sys.exit(3)
    elif opt in ("-h", "--help"):
        usage()
        sys.exit(3)

if warning_level == -1 or critical_level == -1:
    print "Warning level and critical level must be set. "
    usage()
    sys.exit(3)
elif warning_level > critical_level:
    print "Warning level must be smaller than critical level. "
    sys.exit(3)

if os.path.isfile(qmail_log_path) == False:
    print "qmail log path not found. "
    sys.exit(3)

endtime = int(time.time())
starttime = endtime-delai

empty_section = True
success_msg_cnt = 0
fail_msg_cnt = 0
local_msg_cnt = 0
remote_msg_cnt = 0

filestream = open(qmail_log_path,'r')
for line in filestream.readlines():
    line_time = tai64_unix(line[:26])
    if line_time < endtime and line_time>starttime:
        empty_section = False
        if "delivery" in line and "success:" in line:
            success_msg_cnt +=1
        elif "delivery" in line and "failure:" in line:
            fail_msg_cnt +=1
        elif 'to local' in line:
            local_msg_cnt +=1
        elif 'to remote' in line:
            remote_msg_cnt +=1

if empty_section:
    print "CRITICAL - Empty log"
    sys.exit(2)
else:
    try:
        ratio = round(fail_msg_cnt*100.0/(success_msg_cnt+fail_msg_cnt),2)
    except ZeroDivisionError:
        print "CRITICAL - No messages processsed. "
        sys.exit(2)
    appendix  = "\n|'Failure ratio'=" + str(ratio) + "%;"+str(warning_level)+";"+str(critical_level)+";0;100"
    appendix += "\n|'Successful delivery'=" + str(success_msg_cnt)
    appendix += "\n|'Failed delivery'=" + str(fail_msg_cnt)
    appendix += "\n|'Local delivery'=" + str(local_msg_cnt)
    appendix += "\n|'Remote delivery'=" + str(remote_msg_cnt)
    if ratio > critical_level:
        print "CRITICAL - " + str(ratio) + "% delivery failure ratio. " + appendix
        sys.exit(2)
    elif ratio > warning_level:
        print "WARNING - " + str(ratio) + "% delivery failure ratio. " + appendix
        sys.exit(1)
    else:
        print "OK - " + str(ratio) + "% delivery failure ratio. " + appendix
        sys.exit(0)