nrpe-bird/check_bgp

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#!/bin/sh
# Copyright 2017 alarig <alarig@grifon.fr>
#
# BSD-3-Clause licence
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions are met:
#
# 1. Redistributions of source code must retain the above copyright notice,
# this list of conditions and the following disclaimer.
#
# 2. Redistributions in binary form must reproduce the above copyright notice,
# this list of conditions and the following disclaimer in the documentation
# and/or other materials provided with the distribution.
#
# 3. Neither the name of the copyright holder nor the names of its contributors
# may be used to endorse or promote products derived from this software without
# specific prior written permission.
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
# AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
# ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
# LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
# CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
# SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
# INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
# CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
# ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
# POSSIBILITY OF SUCH DAMAGE.
# For debuggin purpose, uncomment the next line and `tail -F` the file.
#exec 2> /tmp/check_bgp.log
usage() {
printf "Usage:\n"
printf "check_bgp [-4|-6] -p session\n"
printf "Must be run with user account able to use birdc/birdc6 or use"
printf "-s to use birdc with sudo.\n"
}
args=$(getopt 46hsp: $*)
if [ $? -ne 0 ]; then
usage
exit 3
fi
set -- $args
while :; do
case "$1" in
-h)
usage
exit 0
shift
;;
-4)
VERSION="IPv4"
shift
;;
-6)
VERSION="IPv6"
shift
;;
-s)
SUDO='sudo'
shift
;;
-p)
SESSION="$2"
shift; shift
;;
--)
shift; break
;;
esac
done
# path expansion for birdc and sudo of FreeBSD
PATH="$PATH:/usr/local/sbin/:/usr/local/bin/"
if [ "${VERSION}" = "IPv4" ]; then
birdc="${SUDO} birdc -r"
elif [ "${VERSION}" = "IPv6" ]; then
birdc="${SUDO} birdc6 -r"
else
printf "CRITICAL: Invalid IP version, use -4 for IPv4 and -6 for IPv6\n"
exit 2
fi
if [ -z ${SESSION} ]; then
printf "CRITICAL: No session name supplied, use -p \$session.\n"
exit 2
fi
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STATE="$($birdc show protocol ${SESSION} | \
awk -v session=${SESSION} '$0 ~ session { print $6 }')"
ROUTE_LIMIT_IN="$($birdc show protocol all ${SESSION} | \
awk '/Receive limit/ { print $3 }')"
# Test if we are on a bird2
if [ -z ${ROUTE_LIMIT_IN} ]; then
ROUTE_LIMIT_IN="$($birdc show protocol all ${SESSION} | \
awk '/Import limit/ { print $3 }')"
fi
# There is no import limit, so no ratio either
if [ -z ${ROUTE_LIMIT_IN} ]; then
RATIO_IN=0
fi
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ROUTES_IMPORTED="$($birdc show protocol all ${SESSION} | grep 'Routes:' | \
sed -Ee '/imported/{ s/^.* ([0-9]+) imported.*$/\1/; p;}' -e d)"
ROUTE_HIT_IN="$($birdc show protocol all ${SESSION} | \
grep -E 'Receive limit:.*HIT')"
if [ ! -z ${ROUTE_LIMIT_IN} ]; then
RATIO_IN=$(echo "(${ROUTES_IMPORTED}*100)/${ROUTE_LIMIT_IN}" | bc)
fi
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ROUTE_HIT_OUT="$($birdc show protocol all ${SESSION} | \
grep -E 'Export limit:.*HIT')"
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# Session states: https://gitlab.labs.nic.cz/labs/bird/blob/master/proto/bgp/bgp.c#L1465
# Plugin return codes: https://nagios-plugins.org/doc/guidelines.html#AEN78
case ${STATE} in
Established)
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if [ "${ROUTE_HIT_IN}" != "" ]; then
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printf "CRITICAL: ${SESSION} has hit import route "
printf "limit\n"
exit 2
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elif [ "${ROUTE_HIT_OUT}" != "" ]; then
printf "CRITICAL: ${SESSION} has hit export route "
printf "limit\n"
exit 2
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elif [ ${RATIO_IN} -gt 92 ]; then
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printf "WARNING: ${SESSION} import route limit is "
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printf "over threshold\n"
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exit 1
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else
printf "OK: ${SESSION} is ${STATE}\n"
exit 0
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fi
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;;
OpenSent | OpenConfirm)
printf "WARNING: ${SESSION} is in ${STATE} state\n"
exit 1
;;
Idle | Connect | Active)
printf "CRITICAL: ${SESSION} is in ${STATE} state\n"
exit 2
;;
*)
printf "Unknown state: ${STATE}\n"
exit 3
;;
esac