200 lines
4.4 KiB
Bash
Executable file
200 lines
4.4 KiB
Bash
Executable file
#!/bin/sh
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# Petit script custom pour vérifier le nombre de connexions sur netstat
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# GPL v3+ (copyright chl-dev@bugness.org)
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# Default values
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RANGE_WARNING="1:50"
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RANGE_CRITICAL="1:100"
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# Output
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OUTPUT_EXIT_STATUS=0
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OUTPUT_DETAIL_WARNING=""
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OUTPUT_DETAIL_CRITICAL=""
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OUTPUT_PERFDATA=""
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PROGPATH=$( echo $0 | sed -e 's,[\\/][^\\/][^\\/]*$,,' )
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REVISION="0.1"
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# Stop at the first non-catched error
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set -e
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# Include check_range()
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. $PROGPATH/utils.sh
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#
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# Fonction d'aide
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#
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usage() {
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cat <<EOF
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Usage :
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$0 [-w warning_range] [-c critical_range] -p port [[-w...] -p port] ...
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Example :
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./check_netstat_connectioncount.sh -w 50 -c 100 -p 80
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Note: Since the port is checked against the lastest ranges given, order
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of the arguments is important. Ex:
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./check_netstat_connectioncount.sh -w 1:5 -c 1:10 -p 22 -p listen-unix:X11 -w 1:50 -c 1:100 -p 80 -p 443
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Special values for 'port' :
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all
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all-ipv4
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all-ipv6
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listen
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listen-ipv4
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listen-ipv6
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listen-unix
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listen-unix:PATTERN
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Default values:
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warning_range: $RANGE_WARNING
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critical_range: $RANGE_CRITICAL
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EOF
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}
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check_range_syntax() {
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check_range 0 "$1" >/dev/null 2>&1
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if [ "$?" -eq "2" ]; then
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return 1
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fi
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return 0
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}
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# Some early checks
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for i in netstat ss; do
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if which "$i" >/dev/null 2>&1 ; then
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COMMAND_SYS="$i"
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if [ "$COMMAND_SYS" = "ss" ]; then
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OUTPUT_COLUMN=5
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else
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OUTPUT_COLUMN=4
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fi
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break
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fi
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done
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if [ -z "$COMMAND_SYS" ]; then
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echo "UNKNOWN 'netstat' and 'ss' not found."
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exit 1
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fi
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#
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# Gestion des paramètres
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#
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while getopts hw:c:p: f; do
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case "$f" in
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'h')
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usage
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exit
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;;
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'w')
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if check_range_syntax "$OPTARG" >/dev/null; then
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RANGE_WARNING="$OPTARG"
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else
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echo "UNKNOWN: invalid range."
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exit 3
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fi
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;;
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'c')
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if check_range_syntax "$OPTARG" >/dev/null; then
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RANGE_CRITICAL="$OPTARG"
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else
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echo "UNKNOWN: invalid range."
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exit 3
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fi
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;;
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'p')
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# Ce n'est pas très propre, mais on gère tout ici plutôt que de remplir
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# un buffer et de le traiter ensuite
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# Note : grep renvoie un code d'erreur 1 s'il n'y a pas de résultat,
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# d'où l'ajout d'un || true sur lui uniquement.
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LABEL="$OPTARG"
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case "$OPTARG" in
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'all')
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CPT="$( $COMMAND_SYS -taun | tail -n +2 | wc -l )"
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PORT_NUMBER='all'
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;;
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'all-ipv4')
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CPT="$( $COMMAND_SYS -taun4 | tail -n +2 | wc -l )"
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PORT_NUMBER='all-ipv4'
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;;
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'all-ipv6')
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CPT="$( $COMMAND_SYS -taun6 | tail -n +2 | wc -l )"
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PORT_NUMBER='all-ipv6'
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;;
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'listen')
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CPT="$( $COMMAND_SYS -tlun | tail -n +2 | wc -l )"
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PORT_NUMBER='listen'
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;;
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'listen-ipv4')
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CPT="$( $COMMAND_SYS -tlun4 | tail -n +2 | wc -l )"
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PORT_NUMBER='listen-ipv4'
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;;
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'listen-ipv6')
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CPT="$( $COMMAND_SYS -tlun6 | tail -n +2 | wc -l )"
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PORT_NUMBER='listen-ipv6'
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;;
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'listen-unix')
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CPT="$( $COMMAND_SYS -xl | tail -n +2 | wc -l )"
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PORT_NUMBER='listen-unix'
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;;
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'listen-unix:'*)
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CPT="$( $COMMAND_SYS -xl | tail -n +2 | grep "$( echo "$OPTARG" | sed 's/^listen-unix://' )" | wc -l )"
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PORT_NUMBER=$OPTARG # risque de bug côté superviseur ?
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;;
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*)
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PORT_NUMBER=$( printf "%d" "$OPTARG" )
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LABEL="port$PORT_NUMBER"
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CPT="$( $COMMAND_SYS -taun | sed 's/[[:space:]]\+/\t/g' | cut -f "$OUTPUT_COLUMN" | ( grep -c ":$PORT_NUMBER$" || true ) )"
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;;
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esac
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# mémo : 'label'=value[UOM];[warn];[crit];[min];[max]
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OUTPUT_PERFDATA=$( printf "%s\n'%s'=%d;%s;%s;0;" \
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"$OUTPUT_PERFDATA" \
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"$LABEL" \
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"$CPT" \
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"$RANGE_WARNING" \
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"$RANGE_CRITICAL" )
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if check_range "$CPT" "$RANGE_CRITICAL"; then
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OUTPUT_EXIT_STATUS=2
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OUTPUT_DETAIL_CRITICAL="$OUTPUT_DETAIL_CRITICAL Port:$PORT_NUMBER($CPT conn.)"
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elif check_range "$CPT" "$RANGE_WARNING"; then
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if [ "$OUTPUT_EXIT_STATUS" -eq 0 ]; then
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OUTPUT_EXIT_STATUS=1
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fi
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OUTPUT_DETAIL_WARNING="$OUTPUT_DETAIL_WARNING Port:$PORT_NUMBER($CPT conn.)"
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fi
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;;
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\?)
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usage
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exit 1
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;;
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esac
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done
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case "$OUTPUT_EXIT_STATUS" in
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'0')
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printf "OK ($COMMAND_SYS)"
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;;
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'1')
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printf "WARNING ($COMMAND_SYS) %s" "$OUTPUT_DETAIL_WARNING"
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;;
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'2')
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printf "CRITICAL ($COMMAND_SYS) %s" "$OUTPUT_DETAIL_CRITICAL"
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;;
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*)
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printf "UNKNOWN"
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;;
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esac
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# We sort the entries to avoid mismatch with poor implementations of pnp4nagios
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printf "|%s\n" "$( printf "%s" "$OUTPUT_PERFDATA" | grep -v "^$" | sort | tr "\n" " " )"
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# on supprime les retours à la ligne
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exit $OUTPUT_EXIT_STATUS
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