check_postfix_queue

#!/bin/sh -e

# 2011 (C) Artyom Nosov <chip-set@mail.ru>
#
# v1.0: initial release
# v1.2: fix indent and dash support
# v1.3: check directory $queue_directory permissions (thx Daniel Beardsmore)

# XXX: add the following sudo access rights to /etc/sudoers.d/postfix_nagios:
# nagios  ALL = NOPASSWD: /usr/bin/find /var/spool/postfix/incoming -type f -print, /usr/bin/find /var/spool/postfix/active -type f -print, /usr/bin/find /var/spool/postfix/maildrop -type f -print, /usr/bin/find /var/spool/postfix/deferred -type f -print, /usr/bin/find /var/spool/postfix/bounce -type f -print

PATH=/bin:/sbin:/usr/bin:/usr/sbin:${PATH}; export PATH
LC_MESSAGES=C; export LC_MESSAGES

PROGNAME=`basename $0`
PROGPATH=`dirname $(readlink -f $0)`

queue_directory=`postconf -h queue_directory`

: ${CRITICAL_DEFAULT_THRESHOLD="50"}
: ${WARNING_DEFAULT_THRESHOLD="25"}

. /usr/lib/nagios/plugins/utils.sh

EXIT_CODE="OK"

print_usage() {
  echo "Usage: $PROGNAME [OPTION]"
  echo 
  echo "Options: "
  echo " -c critical"
  echo "    Critical threshold, defaults to $CRITICAL_DEFAULT_THRESHOLD"
  echo
  echo " -w warning"
  echo "    Warning threshold, defaults to $WARNING_DEFAULT_THRESHOLD"
  echo
  echo " -h"
  echo "    Display this help and exit"
  echo
  echo "Examples: "
  echo "$0 -w 100000 -c 200000"
}

print_help() {
  print_usage
  echo 
  echo "This plugin checks status of postfix queues."
	echo 
  exit $STATE_OK
}

exitf() {
  local state=$1
  shift
  local message="$*"

  echo $message

  exit $state
}

eval_state() {
  local curval=$1

  if [ $curval -lt 0 ]; then
    max_state $EXIT_CODE "CRITICAL"
  fi

  if [ $curval -gt $warning_threshold ]; then
    max_state $EXIT_CODE "WARNING"
  fi

  if [ $curval -gt $critical_threshold ]; then
    max_state $EXIT_CODE "CRITICAL"
  fi
}

upvar() {
  if unset -v "$1"; then       # Unset & validate varname
    if [ $# -eq 2 ]; then
      eval $1=\"\$2\"          # Return single value
    else
      eval $1=\(\"\${@:2}\"\)  # Return array
    fi
  fi
}

isint() {
  local var="$*"
  local retval=

  expr "$var" : '-\?[0-9]\+$' > /dev/null
  retval=$?

  return $retval
}

max_state() {
  local a=$1
  local b=$2

  if [ $a = "CRITICAL" -o $b = "CRITICAL" ]; then
    EXIT_CODE="CRITICAL"; return
  elif [ $a = "WARNING" -o $b = "WARNING" ]; then
    EXIT_CODE="WARNING"; return
  elif [ $a = "OK" -o $b = "OK" ]; then
    EXIT_CODE="OK"; return
  elif [ $a = "UNKNOWN" -o $b = "UNKNOWN" ]; then
    EXIT_CODE="UNKNOWN"; return
  elif [ $a = "DEPENDENT" -o $b = "DEPENDENT" ]; then
    EXIT_CODE="DEPENDENT"; return
  fi

  EXIT_CODE="UNKNOWN"; return
}

code2status() {
  local code=$1
  local status

  case "$code" in
    [oO][kK])                             status=$STATE_OK
                                          ;;
    [cC][rR][iI][tT][iI][cC][aA][lL])     status=$STATE_CRITICAL
                                          ;;
    [wW][aA][rR][nN][iI][nN][gG])         status=$STATE_WARNING
                                          ;;
    [dD][eE][pP][eE][nN][dD][eE][nN][tT]) status=$STATE_DEPENDENT
                                          ;;
    *)                                    status=$STATE_UNKNOWN
                                          ;;
  esac

  echo $status
}

critical_threshold=$CRITICAL_DEFAULT_THRESHOLD
warning_threshold=$WARNING_DEFAULT_THRESHOLD

while getopts c:hw: opt
do
  case "$opt" in
    c)
      if ! isint "$OPTARG"; then
        exitf $STATE_CRITICAL "String \"$OPTARG\" is not a valid integer!"
      fi
      critical_threshold="$OPTARG"
      ;;
    w)
      if ! isint "$OPTARG"; then
        exitf $STATE_CRITICAL "String \"$OPTARG\" is not a valid integer!"
      fi
      warning_threshold="$OPTARG";
      ;;
    h)
      print_help
      exitf $STATE_OK
  esac
done
shift `expr $OPTIND - 1`

for d in incoming active maildrop deferred bounce; do
  if [ ! -d $queue_directory/$d ]; then
    upvar $d -1
    continue
  fi
  upvar $d `sudo find $queue_directory/$d -type f -print 2>/dev/null | wc -l`
done

INFO_MSG="incoming queue messages: $incoming active queue messages: $active maildrop queue messages: $maildrop deferred queue messages: $deferred bounce queue messages: $bounce"

for d in incoming active maildrop deferred bounce; do
  eval eval_state \$$d
done

exitf `code2status $EXIT_CODE` "$EXIT_CODE: $INFO_MSG"