#!/bin/sh

# Petit script pour vérifier qu'une IP souhaitée est en tête des IP configurées
# GPL v3+ (copyright chl-dev@bugness.org)

# Initialisation
IGNORED_ADDRESS="127.0.0. ::1 fe80:"

# Output
OUTPUT_EXIT_STATUS=0
OUTPUT_DETAIL_WARNING=""
OUTPUT_DETAIL_CRITICAL=""
OUTPUT_PERFDATA=""

PROGPATH=$( echo $0 | sed -e 's,[\\/][^\\/][^\\/]*$,,' )
REVISION="0.1"

# Stop at the first non-catched error
set -e

# Include check_range()
. $PROGPATH/utils.sh

#
# Fonction d'aide
#
usage() {
	cat <<EOF
Usage :
  $0 [-x xxxxx] [-x yyyy]  [-4 nnn.nnn.nnn.nnn] [-6 nnnn:nnnn:nnnn::nnnn]

	WARNING: order of arguments are important.
	-x : address (or start of address) which must be ignored. Often '127.0' and 'fe80'.
	-4 : IPv4 address which must be first
	-6 : IPv6 address which must be first

  Default values:
    -x "$IGNORED_ADDRESS"
EOF
}

#
# Gestion des paramètres
#
while getopts h4:6:x: f; do
	case "$f" in
		'h')
			usage
			exit
			;;

		'x')
			IGNORED_ADDRESS="$OPTARG"
			;;

		'4')
			IPV4="$OPTARG";
			LISTING="$( ip -4 addr show | sed -n 's/^[[:space:]]*inet \([0-9.]\+\)\/[0-9].*/\1/p' )"
			for i in $IGNORED_ADDRESS; do
				LISTING="$( echo "$LISTING" | grep -v "^$i" || true )"
			done
			FIRST="$( echo "$LISTING" | head -n 1 )"
			if [ "$FIRST" != "$IPV4" ]; then
				OUTPUT_EXIT_STATUS=2
				OUTPUT_DETAIL_CRITICAL="$OUTPUT_DETAIL_CRITICAL ('$FIRST' instead of '$IPV4')"
			else
				OUTPUT_DETAIL_OK="$OUTPUT_DETAIL_OK ('$FIRST')"
			fi
			;;

		'6')
			IPV6="$OPTARG";
			LISTING="$( ip -6 addr show | sed -n 's/^[[:space:]]*inet6 \([a-f0-9:]\+\)\/[0-9].*/\1/p' )"
			for i in $IGNORED_ADDRESS; do
				LISTING="$( echo "$LISTING" | grep -v "^$i" || true )"
			done
			FIRST="$( echo "$LISTING" | head -n 1 )"
			if [ "$FIRST" != "$IPV6" ]; then
				OUTPUT_EXIT_STATUS=2
				OUTPUT_DETAIL_CRITICAL="$OUTPUT_DETAIL_CRITICAL ('$FIRST' instead of '$IPV6')"
			else
				OUTPUT_DETAIL_OK="$OUTPUT_DETAIL_OK ('$FIRST')"
			fi
			;;

		\?)
			usage
			exit 1
			;;
	esac
done

case "$OUTPUT_EXIT_STATUS" in
	'0')
		printf "OK %s" "$OUTPUT_DETAIL_OK"
		;;
	'1')
		printf "WARNING %s" "$OUTPUT_DETAIL_WARNING"
		;;
	'2')
		printf "CRITICAL %s" "$OUTPUT_DETAIL_CRITICAL"
		;;
	*)
		printf "UNKNOWN"
		;;
esac

# (pas de perfdata dans ce script)
#printf "|%s\n" "$OUTPUT_PERFDATA"
printf "\n"
# on supprime les retours à la ligne
exit $OUTPUT_EXIT_STATUS