#!/bin/bash
# Memory usage monitorization plugin for Pandora FMS agent
# Author: Manuel A. Gulín Bejarano
# Version: 1.0
# Date: 15/03/2013
#
# 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/>.

function help {
        echo -e "Memory usage monitorization agent plugin for Pandora FMS agent. http://pandorafms.com" 
        echo -e "Syntax:"
        echo -e "\t\t$0"
        exit
}

if [ $# -ne 0 ]
then
        help
        exit -1
fi


# Info about swap memory - all retrieved with one query, later it's going to be appropiately parsed
MEM_INFO=`free -m | grep Mem:`

# Info about swap memory - all retrieved with one query, later it's going to be appropiately parsed
MEMAPP_INFO=`free -m | grep cache:`

# Info about swap memory - all retrieved with one query, later it's going to be appropiately parsed
SWP_INFO=`free -m | grep Swap:`

# Info about memory - from the kernel's standpoint
MEM_SPACE=`echo $MEM_INFO | awk '{print $2}'`
MEM_USAGE=`echo $MEM_INFO | awk '{print $3}'`
MEM_FREE=`echo $MEM_INFO | awk '{print $4}'`
MEM_SHARED=`echo $MEM_INFO | awk '{print $5}'`
MEM_BUFF=`echo $MEM_INFO | awk '{print $6}'`
MEM_CACHE=`echo $MEM_INFO | awk '{print $7}'`
MEM_USAGE100=`echo $MEM_USAGE $MEM_SPACE | awk '{if ($2>0) {print int(10000*$1/$2)/100} else {print 0}}'`
MEM_BUFF100=`echo $MEM_BUFF $MEM_SPACE | awk '{if ($2>0) {print int(10000*$1/$2)/100} else {print 0}}'`
MEM_CACHE100=`echo $MEM_CACHE $MEM_SPACE | awk '{if ($2>0) {print int(10000*$1/$2)/100} else {print 0}}'`

# Info about memory - from the application's standpoint
MEMAPP_USAGE=`echo $MEMAPP_INFO | awk '{print $3}'`
MEMAPP_FREE=`echo $MEMAPP_INFO | awk '{print $4}'`
MEMAPP_FREE100=`echo $MEMAPP_FREE $MEM_SPACE | awk '{if ($2>0) {print int(10000*$1/$2)/100} else {print 0}}'`

# Info about swap
SWP_SPACE=`echo $SWP_INFO | awk '{print $2}'`
SWP_USAGE=`echo $SWP_INFO | awk '{print $3}'`
SWP_USAGE100=`echo "$SWP_USAGE $SWP_SPACE"  | awk '{print ($1*100/$2)}'`



# Module to get the total RAM
echo -e "\t<module>"
echo -e "\t<name><![CDATA[Memory: Total (MB)]]></name>"
echo -e "\t<description><![CDATA[Total memory in megabytes]]></description>"
echo -e "\t<type>async_data</type>"
echo -e "\t<unit>MB</unit>"
echo -e "\t<min>0</min>"
echo -e "\t<disabled>0</disabled>"
echo -e "\t<data><![CDATA[$MEM_SPACE]]></data>"
#echo -e "\t<crontab>0 * * * *</crontab>""
echo -e "\t</module>"

# Module to get the used RAM from the kernel standpoint
echo -e "\t<module>"
echo -e "\t<name><![CDATA[Memory: Used (MB)]]></name>"
echo -e "\t<description><![CDATA[Used memory in megabytes from the kernel standpoint]]></description>"
echo -e "\t<type>generic_data</type>"
echo -e "\t<unit>MB</unit>"
echo -e "\t<min>0</min>"
echo -e "\t<max>$MEM_SPACE</max>"
echo -e "\t<disabled>0</disabled>"
echo -e "\t<data><![CDATA[$MEM_USAGE]]></data>"
echo -e "\t</module>"

# Module to get the free RAM from the kernel standpoint
echo -e "\t<module>"
echo -e "\t<name><![CDATA[Memory: Free (MB)]]></name>"
echo -e "\t<description><![CDATA[Free memory in megabytes from the kernel standpoint]]></description>"
echo -e "\t<type>generic_data</type>"
echo -e "\t<unit>MB</unit>"
echo -e "\t<min>0</min>"
echo -e "\t<max>$MEM_SPACE</max>"
echo -e "\t<disabled>0</disabled>"
echo -e "\t<data><![CDATA[$MEM_FREE]]></data>"
echo -e "\t</module>"

# Module to get the shared RAM
echo -e "\t<module>"
echo -e "\t<name><![CDATA[Memory: Shared (MB)]]></name>"
echo -e "\t<description><![CDATA[Shared memory in megabytes]]></description>"
echo -e "\t<type>generic_data</type>"
echo -e "\t<unit>MB</unit>"
echo -e "\t<min>0</min>"
echo -e "\t<max>$MEM_SPACE</max>"
echo -e "\t<disabled>0</disabled>"
echo -e "\t<data><![CDATA[$MEM_SHARED]]></data>"
echo -e "\t</module>"

# Module to get the RAM used by buffers
echo -e "\t<module>"
echo -e "\t<name><![CDATA[Memory: Buffers (MB)]]></name>"
echo -e "\t<description><![CDATA[Memory for buffers in megabytes]]></description>"
echo -e "\t<type>generic_data</type>"
echo -e "\t<unit>MB</unit>"
echo -e "\t<min>0</min>"
echo -e "\t<max>$MEM_SPACE</max>"
echo -e "\t<disabled>0</disabled>"
echo -e "\t<data><![CDATA[$MEM_BUFF]]></data>"
echo -e "\t</module>"

# Module to get the RAM used by cache
echo -e "\t<module>"
echo -e "\t<name><![CDATA[Memory: Cache (MB)]]></name>"
echo -e "\t<description><![CDATA[Memory for cache in megabytes]]></description>"
echo -e "\t<type>generic_data</type>"
echo -e "\t<unit>MB</unit>"
echo -e "\t<min>0</min>"
echo -e "\t<max>$MEM_SPACE</max>"
echo -e "\t<disabled>0</disabled>"
echo -e "\t<data><![CDATA[$MEM_CACHE]]></data>"
echo -e "\t</module>"

# Module to get the percentage of used RAM from the kernel standpoint
echo -e "\t<module>"
echo -e "\t<name><![CDATA[Memory: Performance - Used (%)]]></name>"
echo -e "\t<description><![CDATA[Percentage of used memory from the kernel standpoint]]></description>"
echo -e "\t<type>generic_data</type>"
echo -e "\t<unit>%</unit>"
echo -e "\t<min>0</min>"
echo -e "\t<max>100</max>"
echo -e "\t<min_warning>95</min_warning>"
echo -e "\t<max_warning>98.99</max_warning>"
echo -e "\t<min_critical>99</min_critical>"
echo -e "\t<max_critical>100</max_critical>"
echo -e "\t<disabled>0</disabled>"
echo -e "\t<data><![CDATA[$MEM_USAGE100]]></data>"
echo -e "\t</module>"

# Module to get the percentage of RAM used by buffers
echo -e "\t<module>"
echo -e "\t<name><![CDATA[Memory: Performance - Buffers (%)]]></name>"
echo -e "\t<description><![CDATA[Percentage of memory for buffers]]></description>"
echo -e "\t<type>generic_data</type>"
echo -e "\t<unit>%</unit>"
echo -e "\t<min>0</min>"
echo -e "\t<max>100</max>"
echo -e "\t<min_critical>0</min_critical>"
echo -e "\t<max_critical>1</max_critical>"
echo -e "\t<min_warning>1.01</min_warning>"
echo -e "\t<max_warning>5</max_warning>"
echo -e "\t<disabled>0</disabled>"
echo -e "\t<data><![CDATA[$MEM_BUFF100]]></data>"
echo -e "\t</module>"

# Module to get the percentage of RAM used by cache
echo -e "\t<module>"
echo -e "\t<name><![CDATA[Memory: Performance - Cache (%)]]></name>"
echo -e "\t<description><![CDATA[Percentage of memory for cache]]></description>"
echo -e "\t<type>generic_data</type>"
echo -e "\t<unit>%</unit>"
echo -e "\t<min>0</min>"
echo -e "\t<max>100</max>"
echo -e "\t<min_critical>0</min_critical>"
echo -e "\t<max_critical>1</max_critical>"
echo -e "\t<min_warning>1.01</min_warning>"
echo -e "\t<max_warning>5</max_warning>"
echo -e "\t<disabled>0</disabled>"
echo -e "\t<data><![CDATA[$MEM_CACHE100]]></data>"
echo -e "\t</module>"

# Module to get the used RAM from the applications standpoint
echo -e "\t<module>"
echo -e "\t<name><![CDATA[Memory: FAS Used (MB)]]></name>"
echo -e "\t<description><![CDATA[Used memory in megabytes from the applications standpoint]]></description>"
echo -e "\t<type>generic_data</type>"
echo -e "\t<unit>MB</unit>"
echo -e "\t<min>0</min>"
echo -e "\t<max>$MEM_SPACE</max>"
echo -e "\t<disabled>0</disabled>"
echo -e "\t<data><![CDATA[$MEMAPP_USAGE]]></data>"
echo -e "\t</module>"

# Module to get the free RAM from the applications standpoint
echo -e "\t<module>"
echo -e "\t<name><![CDATA[Memory: FAS Free (MB)]]></name>"
echo -e "\t<description><![CDATA[Free memory in megabytes from the applications standpoint]]></description>"
echo -e "\t<type>generic_data</type>"
echo -e "\t<unit>MB</unit>"
echo -e "\t<min>0</min>"
echo -e "\t<max>$MEM_SPACE</max>"
echo -e "\t<disabled>0</disabled>"
echo -e "\t<data><![CDATA[$MEMAPP_FREE]]></data>"
echo -e "\t</module>"

# Module to get the percentage of free RAM from the applications standpoint
echo -e "\t<module>"
echo -e "\t<name><![CDATA[Memory: Performance - FAS Free (%)]]></name>"
echo -e "\t<description><![CDATA[Percentage of free memory from the applications standpoint]]></description>"
echo -e "\t<type>generic_data</type>"
echo -e "\t<unit>%</unit>"
echo -e "\t<min>0</min>"
echo -e "\t<max>100</max>"
echo -e "\t<min_critical>0</min_critical>"
echo -e "\t<max_critical>5</max_critical>"
echo -e "\t<min_warning>5.01</min_warning>"
echo -e "\t<max_warning>15</max_warning>"
echo -e "\t<disabled>0</disabled>"
echo -e "\t<data><![CDATA[$MEMAPP_FREE100]]></data>"
echo -e "\t</module>"

# Module to get the total swap space
echo -e "\t<module>"
echo -e "\t<name><![CDATA[Memory: Total swap space (MB)]]></name>"
echo -e "\t<description><![CDATA[Total swap in megabytes]]></description>"
echo -e "\t<type>async_data</type>"
echo -e "\t<unit>MB</unit>"
echo -e "\t<min>0</min>"
echo -e "\t<disabled>0</disabled>"
echo -e "\t<data><![CDATA[$SWP_SPACE]]></data>"
#echo -e "\t<crontab>0 * * * *</crontab>""
echo -e "\t</module>"

# Module to get the used swap space
echo -e "\t<module>"
echo -e "\t<name><![CDATA[Memory: Used swap space (MB)]]></name>"
echo -e "\t<description><![CDATA[Used swap in megabytes]]></description>"
echo -e "\t<type>generic_data</type>"
echo -e "\t<unit>MB</unit>"
echo -e "\t<min>0</min>"
echo -e "\t<max>$SWP_SPACE</max>"
echo -e "\t<min_warning>100</min_warning>"
echo -e "\t<max_warning>499</max_warning>"
echo -e "\t<min_critical>500</min_critical>"
echo -e "\t<max_critical>$SWP_SPACE</max_critical>"
echo -e "\t<disabled>0</disabled>"
echo -e "\t<data><![CDATA[$SWP_USAGE]]></data>"
echo -e "\t</module>"

# Module to get the % of used swap space
echo -e "\t<module>"
echo -e "\t<name><![CDATA[Memory: Used swap space (%)]]></name>"
echo -e "\t<description><![CDATA[Percentage of used swap space]]></description>"
echo -e "\t<type>generic_data</type>"
echo -e "\t<unit>%</unit>"
echo -e "\t<min>0</min>"
echo -e "\t<max>100</max>"
echo -e "\t<min_warning>40</min_warning>"
echo -e "\t<max_warning>89.9</max_warning>"
echo -e "\t<min_critical>90</min_critical>"
echo -e "\t<max_critical>100</max_critical>"
echo -e "\t<disabled>0</disabled>"
echo -e "\t<data><![CDATA[$SWP_USAGE100]]></data>"
echo -e "\t</module>"