From 7cada9d791ff536546abacb2ae8f88b20c3cc0a8 Mon Sep 17 00:00:00 2001
From: Eric Loyd <eric@bitnetix.com>
Date: Tue, 6 Aug 2024 14:51:11 -0400
Subject: [PATCH] ENV is now available to pull information about the
 host/service into the configuration

---
 ENV | 61 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 61 insertions(+)
 create mode 100755 ENV

diff --git a/ENV b/ENV
new file mode 100755
index 0000000..e83e1ce
--- /dev/null
+++ b/ENV
@@ -0,0 +1,61 @@
+#!/bin/bash
+
+varName="novalue"
+varDefault=""
+myDelim=" "
+myField=""
+
+do_help() {
+cat << HELP_EOF
+This utility is designed to be called by the ARGx parameters of a Nagios configuration as follows:
+
+  \$\$(\$USER1\$/env -n <var> [-t <default>] [-f <field>] [-d <delim>]
+
+Where:
+
+  var     is the name of a NAGIOS_variable (see https://assets.nagios.com/downloads/nagioscore/docs/nagioscore/4/en/macrolist.html) (case insensitive)
+  default is a default value if \$NAGIOS_var\$ is blank (case sensitive)
+  word    is an awk-compatible field number (potentially to use with <delim>)
+  delim   is an awk-compatible field delimiter (defaults to space)
+
+The value will always be trimmed of leading and/or trailing spaces/tabs.
+
+If -f is used, then the result will be as if the request were:
+
+  eche \$NAGIOS_var\$ | awk -F <delim> '{print $<field>}'
+
+Examples:
+
+  .../env -n servicedesc
+    Will return "Root Partition" (or whatever the service check is named)
+  .../env -n hostName
+    Will return "localhost" (or whatever the name of the host is that ran the check)
+  .../env -n SERVICESTATE -t 0
+    Will return the current state of the service (0, 1, 2) or 0 if the state is not defined
+  .../env -n servicedesc -d : -f 2
+    If the service name is "MySQL Check: myDatabase" then it will return "myDatabase" (trimmed)
+
+HELP_EOF
+}
+
+while [ -n "$1" ]; do
+  case "$1" in
+    -n) varName=`echo "NAGIOS_$2" | tr "a-z" "A-Z"`; shift 2;;
+    -t) varDefault="$2"; shift 2;;
+    -d) myDelim="$2"; shift 2;;
+    -f) myField="$2"; shift 2;;
+    *) shift 1;;
+  esac
+done
+
+# If we don't have a config file, then we don't have variables
+if [ -f "$NAGIOS_MAINCONFIGFILE" ]; then
+  varValue="${!varName}"
+  [ -n "$varValue" -a -n "$myField" ] && varValue=`echo "$varValue" | awk -F "$myDelim" --assign f="$myField" '{print $f}'`
+fi
+[ -z "$varValue" ] && varValue="$varDefault"
+varValue=`echo $varValue | sed -e "s/^[ \t]*//" -e "s/[ \t]*$//"`
+  
+echo "$varValue"
+
+exit 0