Nagios Plugin to check a Synology NAS over SMTP.

You need to install php-snmp

/usr/bin/php ./check_synology.php -H 192.168.2.200 -P 2 -C public -m system -t temperatur -w 35 -c 45
Warning - 36,00 °C | Temperatur=36,00;35;45

/usr/bin/php ./check_synology.php -H 192.168.2.200 -P 2 -C public -m system -t update -c ~2 -w 2
OK - DS720+ , XXXXXXXXXXXXX , DSM 7.0-41222 , Unavailable

/usr/bin/php ./check_synology.php -H 192.168.2.200 -P 2 -C public -m system -t status
OK - System: OK - Powerstatus: OK - Fan: OK - CpuFan: OK

/usr/bin/php ./check_synology.php -H 192.168.2.200 -P 2 -C public -m cpu -t usage -w 80 -c 90
OK - 9% (User: 7% System: 2% I/O Wait: 2% Idle: 89%)|Cpu=9%;80;90;; User=7% System=2% IOWait=2% Idle=89%

/usr/bin/php ./check_synology.php -H 192.168.2.200 -P 2 -C public -m memory -t usage -w 80 -c 90
OK - 40,8% (4092376KB | TOTAL=10031480KB;;;; USED=4092376KB;;;; FREE= 218228KB;;;; CACHES=5720876KB;;;;

/usr/bin/php ./check_synology.php -H 192.168.2.200 -P 2 -C public -m disk -t status
OK - Normal: 4 - Initalized: 0 - NotInitalized: 0 - SystemPartitionFailed: 0 - Crashed: 0

/usr/bin/php ./check_synology.php -H 192.168.2.200 -P 2 -C public -m disk -t status -n 2
OK - Disk 2: WD80EFAX-68KNBN0 (SATA) , Normal

/usr/bin/php ./check_synology.php -H 192.168.2.200 -P 2 -C public -m disk -t temperatur -w 25 -c 30
Critical - 35,00 °C | Temperatur=35,00;25;30

/usr/bin/php ./check_synology.php -H 192.168.2.200 -P 2 -C public -m raid -t status
OK - Volume 1: Normal

/usr/bin/php ./check_synology.php -H 192.168.2.200 -P 2 -C public -m raid -t usage -w 50 -c 90
WARNING - Free: 2432,381 MB , Used: 4717,251 MB , Total: 7149,632 MB| used=4717,251MB;3574,500;6434,100

/usr/bin/php ./check_synology.php -H 192.168.2.200 -P 2 -C public -m ups -t usage -w 50 -c 25
OK - Charged: 100% (Minutes: 1171) | Charged=100%;50;25;;

/usr/bin/php ./check_synology.php -H 192.168.2.200 -P 2 -C public -m service -t CIFS -w 5 -c 10
Warning - CIFS: 9

/usr/bin/php ./check_synology.php -H 192.168.2.200 -P 3 -m service -t CIFS -w 5 -c 10 -u nagios -p nagiossnmp -a MD5 -x DES -X nagiossnmp
Warning - CIFS: 9

/usr/bin/php ./check_synology.php -H 192.168.2.200 -P 2 -C public -m network -V
Array
(
[iso.3.6.1.2.1.31.1.1.1.1.1] => STRING: "lo"
[iso.3.6.1.2.1.31.1.1.1.1.2] => STRING: "sit0"
[iso.3.6.1.2.1.31.1.1.1.1.3] => STRING: "eth1"
[iso.3.6.1.2.1.31.1.1.1.1.4] => STRING: "eth0"
[iso.3.6.1.2.1.31.1.1.1.1.5] => STRING: "ovs-system"
[iso.3.6.1.2.1.31.1.1.1.1.6] => STRING: "ovs_eth0"
[iso.3.6.1.2.1.31.1.1.1.1.7] => STRING: "ovs_eth1"
[iso.3.6.1.2.1.31.1.1.1.1.10] => STRING: "tap080027072e2b"
[iso.3.6.1.2.1.31.1.1.1.1.11] => STRING: "tap080027D5E8A7"
)

/usr/bin/php ./check_synology.php -H 192.168.2.200 -P 2 -C public -m network -t usage -n 3
OK - eth1: In: 0.00% (0.68 KB/s ) - Out: 0.00% (0.00 KB/s) | IN=0.00% OUT=0.00%

Usage: /usr/bin/php check_synology.php -H [Synology NAS] -P [snmp_version] -m [mode]( -n [number] ( -t [test] -l [data] -w [Warning] -c [Critical] -d(php debug) -V (snmp debug) )

snmp_version - 2 -C [community string] (default -C public)
               3 -u [user] -p [password] -a [auth. prot. (MD5/SHA]
                 ( -x [priv. proto. (DES/AES) -X [priv. password])

-m mode - system
          cpu
          memory
          disk
          raid
          service 
          ups
          network
          disksmart(only snmp debug)
          io (only snmp debug)
          spaceio (only snmp debug)
          flashcache (only snmp debug)
          iscsilun (only snmp debug)
          ebox (only snmp debug)
          ha (only snmp debug)
          gpuinfo (only snmp debug)

-n number - disk/raid/network

-t test - temperatur (system/disk)
          update (system)
          status (system/disk/raid/ups)
          usage (raid/cpu/memory/ups/network)
          CIFS, AFP, NFS, FTP, SFTP, HTTP/HTTPS, TELNET, SSH, OTHER (Services)

-l data - F=Fahrenheit or C=Celsius (default)
          T=Terrabyte or M=Megabyte (default)

Example critical and warning (temperatur, update, status and services (CIDS, AFP ...):
-w 10 -c 20 = warning > 10 and critical > 20
-w ~20 -c ~10 = warning < 20 and critical < 10
-w @5:25 -c @10:20 = warning >= 5 and <=25 and critical ≥ 10 and ≤ 20 (inside the range of {5 .. 25})
-w 10:20 -c 5:25 = watning < 10 or > 20, (outside the range of {10 .. 20}) and critical < 5 or > 25, (outside the range of {5 .. 25})

Example critical and warning procent (Usage)
-w 80 -c 90 = warning > 80% and critical > 90% (raid, cpu, memory)
-w 50 -c 25 = warning < 50% and critical < 25% (ups)