nagios/plugins/utils.sh

   1 #! /bin/sh
   2
   3 STATE_OK=0
   4 STATE_WARNING=1
   5 STATE_CRITICAL=2
   6 STATE_UNKNOWN=3
   7 STATE_DEPENDENT=4
   8
   9 if test -x /usr/bin/printf; then
  10         ECHO=/usr/bin/printf
  11 else
  12         ECHO=echo
  13 fi
  14
  15 print_revision() {
  16         echo "$1 v$2 (nagios-plugins 1.4.16)"
  17         $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'
  18 }
  19
  20 support() {
  21         $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'
  22 }
  23
  24 #
  25 # check_range takes a value and a range string, returning successfully if an
  26 # alert should be raised based on the range.
  27 #
  28 check_range() {
  29         local v range yes no err decimal start end cmp match
  30         v="$1"
  31         range="$2"
  32
  33         # whether to raise an alert or not
  34         yes=0
  35         no=1
  36         err=2
  37
  38         # regex to match a decimal number
  39         decimal="-?([0-9]+\.?[0-9]*|[0-9]*\.[0-9]+)"
  40
  41         # compare numbers (including decimals), returning true/false
  42         cmp() { awk "BEGIN{ if ($1) exit(0); exit(1)}"; }
  43
  44         # returns successfully if the string in the first argument matches the
  45         # regex in the second
  46         match() { echo "$1" | grep -E -q -- "$2"; }
  47
  48         # make sure value is valid
  49         if ! match "$v" "^$decimal$"; then
  50                 echo "${0##*/}: check_range: invalid value" >&2
  51                 unset -f cmp match
  52                 return "$err"
  53         fi
  54
  55         # make sure range is valid
  56         if ! match "$range" "^@?(~|$decimal)(:($decimal)?)?$"; then
  57                 echo "${0##*/}: check_range: invalid range" >&2
  58                 unset -f cmp match
  59                 return "$err"
  60         fi
  61
  62         # check for leading @ char, which negates the range
  63         if match $range '^@'; then
  64                 range=${range#@}
  65                 yes=1
  66                 no=0
  67         fi
  68
  69         # parse the range string
  70         if ! match "$range" ':'; then
  71                 start=0
  72                 end="$range"
  73         else
  74                 start="${range%%:*}"
  75                 end="${range#*:}"
  76         fi
  77
  78         # do the comparison, taking positive ("") and negative infinity ("~")
  79         # into account
  80         if [ "$start" != "~" ] && [ "$end" != "" ]; then
  81                 if cmp "$start <= $v" && cmp "$v <= $end"; then
  82                         unset -f cmp match
  83                         return "$no"
  84                 else
  85                         unset -f cmp match
  86                         return "$yes"
  87                 fi
  88         elif [ "$start" != "~" ] && [ "$end" = "" ]; then
  89                 if cmp "$start <= $v"; then
  90                         unset -f cmp match
  91                         return "$no"
  92                 else
  93                         unset -f cmp match
  94                         return "$yes"
  95                 fi
  96         elif [ "$start" = "~" ] && [ "$end" != "" ]; then
  97                 if cmp "$v <= $end"; then
  98                         unset -f cmp match
  99                         return "$no"
 100                 else
 101                         unset -f cmp match
 102                         return "$yes"
 103                 fi
 104         else
 105                 unset -f cmp match
 106                 return "$no"
 107         fi
 108 }