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#!/bin/bash

# Script name: naf_nagios_reconfigure_host_freevar.sh
# Version: v1.02.151028
# Author: Willem D'Haese
# Created on: 15/01/2015
# Purpose: Bash script to process host config files and dynamically update hostgroups
# Recent History:
#   21/10/15 => Creation date
#   27/10/15 => Testing, splitting up import and export config
#   28/10/15 => Finalized replace
# Copyright:
#   This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published
#   by the Free Software Foundation, either version 3 of the License, or (at your option) any later version. This program is distributed
#   in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A
#   PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public
#   License along with this program.  If not, see <http://www.gnu.org/licenses/>.

TEMP=`getopt -o S:u:p:H:O::N:V: --long NagiosServer:,NagiosUser:,NagiosPassword:,NagiosHost:,OldFreeVar:,NewFreeVar:,NewFreeValue: -n 'naf_reconfigure_nagios_host_freevars.sh' -- "$@"`
if [ $? != 0 ] ; then echo "Terminating..." >&2 ; exit 1 ; fi
eval set -- "$TEMP"

while true ; do
    case "$1" in
        -S|--NagiosServer)      NagiosServer=$2 ; shift 2 ;;
        -u|--NagiosUser)        NagiosUser=$2 ; shift 2 ;;
        -p|--NagiosPassword)    NagiosPassword=$2 ; shift 2 ;;
        -H|--NagiosHost)        NagiosHost=$(echo $2 | tr '[:upper:]' '[:lower:]') ; shift 2 ;;
        -O|--OldFreeVar)        OldFreeVar=$2 ; shift 2 ;;
        -N|--NewFreeVar)        NewFreeVar=$2 ; shift 2 ;;
        -V|--NewFreeValue)      NewFreeValue=$2 ; shift 2 ;;
        --)                     shift ; break ;;
        *)                      echo "Argument parsing issue: $1" ; exit 1 ;;
    esac
done

Verbose=1

writelog () {
  if [ -z "$1" ] ; then echo "WriteLog: Log parameter #1 is zero length. Please debug..." ; exit 1
  else
    if [ -z "$2" ] ; then echo "WriteLog: Severity parameter #2 is zero length. Please debug..." ; exit 1
    else
      if [ -z "$3" ] ; then echo "WriteLog: Message parameter #3 is zero length. Please debug..." ; exit 1 ; fi
    fi
  fi
  Now=$(date '+%Y-%m-%d %H:%M:%S,%3N')
  if [ $1 = "Verbose" -a $Verbose = 1 ] ; then echo "$Now: $2: $3"
  elif [ $1 = "Verbose" -a $Verbose = 0 ] ; then :
  elif [ $1 = "Output" ] ; then echo "${Now}: $2: $3"
  elif [ -f $1 ] ; then echo "${Now}: $2: $3" >> $1
  fi
}

writelog Verbose Info "Arguments initialized successfully. OldFreeVar = $OldFreeVar , NewFreeVar = $NewFreeVar , NewFreeVarValue = $NewFreeValue"
ScriptDirectory=$(cd "$( dirname "$0" )" && pwd)
ReactorCfgFolder=/var/www/html/nagiosreactor/application/libraries/scripts/naf/nagiosxicfgs/
Logfile=/var/log/naf_actions.log

checkexistence () {
#    echo "Param 1: $1, Param 2: $2"
    if (echo $1 | grep "\"$2\"" > /dev/null); then
        echo "Hostgroup $2 found. Continuing..."
    else
        Now=$(date '+%Y-%m-%d %H:%M:%S')
        echo "$Now : Error: Hostgroup $2 not found."
        echo "$Now : Error: Hostgroup $2 not found." >> $Logfile
        exit 1
    fi
}

if [ ! -z "$OldFreeVar" ] && [ ! -z "$NewFreeVar" ] && [ ! -z "$NewFreeValue" ] ; then
    writelog Verbose Info "Removing $OldFreeVar"
    sed -i.bak "/$OldFreeVar/d" ${ReactorCfgFolder}${NagiosHost}.cfg
    writelog Verbose Info "Adding $NewFreeVar with value $NewFreeValue"
    sed -i.bak "/.*register.*/ { N; s/.*register.*\n/    $NewFreeVar            $NewFreeValue\n&/ }" ${ReactorCfgFolder}${NagiosHost}.cfg
    writelog Output Info "Replaced $OldFreeVar to $NewFreevar in ${ReactorCfgFolder}${NagiosHost}.cfg"
    rm ${ReactorCfgFolder}${NagiosHost}.cfg.bak
    exit 0
elif [ ! -z "$OldFreeVar" ]; then
    writelog Verbose Info "Removing $OldFreeVar ${OldFreeVar}"
    sed -i.bak "/$OldFreeVar/d" ${ReactorCfgFolder}${NagiosHost}.cfg
    writelog Output Info "Removed OldFreeVar ${OldFreeVar}"
    rm ${ReactorCfgFolder}${NagiosHost}.cfg.bak
    exit 0
elif [ ! -z "$NewFreeVar" ] && [ ! -z "$NewFreeValue" ]; then
    writelog Verbose Info "Checking if free variable $NewFreeVar already exists."
    if grep -q $NewFreeVar "${ReactorCfgFolder}${NagiosHost}.cfg"; then
        writelog Verbose Info "Free variable already exists. Exiting."
        exit 1
    else
        writelog Verbose Info "Adding free variable $NewFreeVar with value $NewFreeValue"
        sed -i.bak "/.*register.*/ { N; s/.*register.*\n/    $NewFreeVar            $NewFreeValue\n&/ }" ${ReactorCfgFolder}${NagiosHost}.cfg
        rm ${ReactorCfgFolder}${NagiosHost}.cfg.bak
        exit 0
    fi
fi
writelog Verbose Info "Variables were not parsed succesfsfully. Please debug."
exit 1