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#!/usr/bin/sh
# -*- sh -*-

: << =cut

=head1 NAME

apc_envunit_ - plugin to monitor temperature and humidity

=head1 APPLICABLE SYSTEMS

Hosts which can use SNMP to connect to an APC environmental unit

=head1 CONFIGURATION

The following environment variables are available

 units     - DNS names of environmental units
 oid       - OID Prefix for humidity probes
 community - SNMP community to use to access the APC unit

The following shows a typical configuration:

 [apc_envunit_*]
   env.units foo.example.org bar.example.org
   env.community 123secret

=head1 INTERPRETATION

Shows a graph with either temperature or humidity for a number of
environmental units.

=head1 MAGIC MARKERS

 #%# family=auto
 #%# capabilities=autoconf suggest

=head1 BUGS

None known. Should be snmp__apc_.

=head1 AUTHOR

Xavier Redon

=head1 LICENSE

Unknown

=cut

type=`echo $0 | sed -e 's/.*_\(.*\)/\1/'`
if [ "${type}" = temperature ] ; then
  TOID="enterprises.318.1.1.10.3.13.1.1.3"
  NAME="temperature"
  LABEL="Celsius Degrees"
  LETTER="t"
else
  if [ "${type}" = humidity ] ; then
   TOID="enterprises.318.1.1.10.3.13.1.1.6"
   NAME="humidity"
   LABEL="Humidity %"
   LETTER="h"
  fi
fi

UNITS=""
COMMUNITY="public"
SNMPGET=`which snmpget 2>/dev/null`

if [ "$units" ]; then UNITS=$units ; fi
if [ "$oid" ]; then TOID=$oid ; fi
if [ "$community" ]; then COMMUNITY=$community ; fi

SNMPOPTS="-Ov -Oq -v1 -c ${COMMUNITY}"



if [ "$1" = "autoconf" ]; then
  if [ -z "${UNITS}" ] ; then echo "no (no units to monitor)" ; exit 0 ; fi
  if [ -z "$SNMPGET" -o ! -x "$SNMPGET" ] ; then 
      echo "no (no snmpget executable)"
      exit 0
  fi

  for m in ${UNITS} ; do
    if ping -c1 -q $m >/dev/null 2>&1 ; then continue ; fi
    echo "no (can't reach $m)" ; exit 0
  done
  echo "yes" ; exit 0
fi

if [ "$1" = "suggest" ]; then
    echo temperature
    echo humidity
    exit 0
fi

if [ "$1" = "config" ]; then
  echo "graph_title Environmental units (${NAME} probes)"
  echo "graph_vlabel ${LABEL}"
  for m in ${UNITS} ; do
    mm=`echo ${m} | tr '-' '_'`
    echo "${mm}_${LETTER}1.label $m ${NAME} #1"
    echo "${mm}_${LETTER}2.label $m ${NAME} #2"
  done
  exit 0
fi

for m in ${UNITS} ; do
  v1=`${SNMPGET} ${SNMPOPTS} $m ${TOID}.1`
  v2=`${SNMPGET} ${SNMPOPTS} $m ${TOID}.2`
  mm=`echo ${m} | tr '-' '_'`
  echo "${mm}_${LETTER}1.value $v1"
  echo "${mm}_${LETTER}2.value $v2"
done