nagios: add check_rdns

[shutils.git] / nagios / plugins / utils.sh

diff --git a/nagios/plugins/utils.sh b/nagios/plugins/utils.sh
new file mode 100755 (executable)
index 0000000..077bd67
--- /dev/null
+++ b/nagios/plugins/utils.sh
@@ -0,0 +1,108 @@
+#! /bin/sh
+
+STATE_OK=0
+STATE_WARNING=1
+STATE_CRITICAL=2
+STATE_UNKNOWN=3
+STATE_DEPENDENT=4
+
+if test -x /usr/bin/printf; then
+       ECHO=/usr/bin/printf
+else
+       ECHO=echo
+fi
+
+print_revision() {
+       echo "$1 v$2 (nagios-plugins 1.4.16)"
+       $ECHO "The nagios 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" | sed -e 's/\n/ /g'
+}
+
+support() {
+       $ECHO "Send email to nagios-users@lists.sourceforge.net if you have questions\nregarding use of this software. To submit patches or suggest improvements,\nsend email to nagiosplug-devel@lists.sourceforge.net.\nPlease include version information with all correspondence (when possible,\nuse output from the --version option of the plugin itself).\n" | sed -e 's/\n/ /g'
+}
+
+#
+# check_range takes a value and a range string, returning successfully if an
+# alert should be raised based on the range.
+#
+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
+}