nagios: oubli

nagios/utils.sh

@@ -0,0 +1,111 @@
+#! /bin/sh
+
+STATE_OK=0
+STATE_WARNING=1
+STATE_CRITICAL=2
+STATE_UNKNOWN=3
+STATE_DEPENDENT=4
+
+print_revision() {
+	echo "$1 v$2 (monitoring-plugins 2.2)"
+	printf '%b' "The Monitoring Plugins come with ABSOLUTELY NO WARRANTY. You may redistribute\ncopies of the plugins under the terms of the GNU General Public License.\nFor more information about these matters, see the file named COPYING.\n"
+}
+
+support() {
+	printf '%b' "Send email to help@monitoring-plugins.org if you have questions regarding use\nof this software. To submit patches or suggest improvements, send email to\ndevel@monitoring-plugins.org. Please include version information with all\ncorrespondence (when possible, use output from the --version option of the\nplugin itself).\n"
+}
+
+#
+# check_range takes a value and a range string, returning successfully if an
+# alert should be raised based on the range.  Range values are inclusive.
+# Values may be integers or floats.
+#
+# Example usage:
+#
+# Generating an exit code of 1:
+# check_range 5 2:8
+#
+# Generating an exit code of 0:
+# check_range 1 2:8
+#
+check_range() {
+	local v range yes no err decimal start end cmp match
+	v="$1"
+	range="$2"
+
+	# whether to raise an alert or not
+	yes=0
+	no=1
+	err=2
+
+	# regex to match a decimal number
+	decimal="-?([0-9]+\.?[0-9]*|[0-9]*\.[0-9]+)"
+
+	# compare numbers (including decimals), returning true/false
+	cmp() { awk "BEGIN{ if ($1) exit(0); exit(1)}"; }
+
+	# returns successfully if the string in the first argument matches the
+	# regex in the second
+	match() { echo "$1" | grep -E -q -- "$2"; }
+
+	# make sure value is valid
+	if ! match "$v" "^$decimal$"; then
+		echo "${0##*/}: check_range: invalid value" >&2
+		unset -f cmp match
+		return "$err"
+	fi
+
+	# make sure range is valid
+	if ! match "$range" "^@?(~|$decimal)(:($decimal)?)?$"; then
+		echo "${0##*/}: check_range: invalid range" >&2
+		unset -f cmp match
+		return "$err"
+	fi
+
+	# check for leading @ char, which negates the range
+	if match $range '^@'; then
+		range=${range#@}
+		yes=1
+		no=0
+	fi
+
+	# parse the range string
+	if ! match "$range" ':'; then
+		start=0
+		end="$range"
+	else
+		start="${range%%:*}"
+		end="${range#*:}"
+	fi
+
+	# do the comparison, taking positive ("") and negative infinity ("~")
+	# into account
+	if [ "$start" != "~" ] && [ "$end" != "" ]; then
+		if cmp "$start <= $v" && cmp "$v <= $end"; then
+			unset -f cmp match
+			return "$no"
+		else
+			unset -f cmp match
+			return "$yes"
+		fi
+	elif [ "$start" != "~" ] && [ "$end" = "" ]; then
+		if cmp "$start <= $v"; then
+			unset -f cmp match
+			return "$no"
+		else
+			unset -f cmp match
+			return "$yes"
+		fi
+	elif [ "$start" = "~" ] && [ "$end" != "" ]; then
+		if cmp "$v <= $end"; then
+			unset -f cmp match
+			return "$no"
+		else
+			unset -f cmp match
+			return "$yes"
+		fi
+	else
+		unset -f cmp match
+		return "$no"
+	fi
+}