A Nagios / Icinga plugin for checking power states of Koukaan NETIO devices


Example Icinga screenshot

check_netio is a Nagios / Icinga plugin for checking power states of Koukaam NETIO devices.


I successfully tested the plugin with NETIO-230A and NETIO-230B devices. Most recent firmware version on newer product releases might not work (see table below).


By default the plugin checks whether your defined power states matches the currently set states. It is also possible to check whether NTP is synchronized. Checking the NETIO is done using the CGI or KShell interface.

You need to specify the following parameters:

Parameter Description
-d / --debug enable debugging outputs (default: no)
-s / --hostname defines the device hostname
-u / --use-kshell use KShell instead of CGI (default: no)
-a / --authfile defines an auth file to use instead of shell variables
-k / --kshell-port defines the KShell port (default: 1234)
-u / --username defines the username
-w / --password defines the password
-y / --use-hash uses password hash instead of plain password (default: no) - currently not supported yet, see issue
-g / --generate-hash generates a password hash and quits (default: no) - currently not supported yet, see issue
-n / --check-ntp checks NTP synchronization state - requires KShell (default: no)
-x / --port-state defines expected port states [0=off, 1=on, ?=whatever]


Check whether the NTP time is synchronized:

$ ./ -s mynetio -u admin -w pass -n
OK - NTP state is synchronized

Check whether the NTP time is synchronized, specifying a different KShell port, login information is prompted:

$ ./ -s mynetio -n -p 1337
Username: admin
CRITICAL - NTP NOT synchronized

Check whether the last port is turned on, login information is assigned using shell variables:

$ NETIO_LOGIN=admin NETIO_PASSWORD=pass ./ -s mynetio -x ???1
WARNING - port difference detected: 4

Check all port states and also NTP synchronization state:

$ ./ -s mynetio -x 0001 -n
Username: admin
OK - ports (0001) matching expectations (0001) - NTP synchronized

Firmware support

See the table below for tested firmware versions:

Device Firmware Status
230A 2.31 working
230A 2.32 working
230A 2.33 working
230A 2.34RC1 working
230B 3.12 working
230B 4.03 working
230B 4.05 working
230C 4.03 not tested
230C 4.05 not tested
230CS 4.03 not tested
230CS 4.05 not tested
NETIO4 4.x not tested
NETIO4-All 4.x not tested

Please let me know if you have tested the plugin on previously untested devices to complete the list!

Authentification options

By default login information are prompted interactively - e.g.:

$ ./ -s mynetio -n

If you want to make the script work unattended you might choose between one of the following options:

Option 1: script parameters

A simple but insecure possibility to assign the login information is to use the following parameters:

  • -u / --username
  • -w / --password

Note that users having access to your Nagios / Icinga configuration are able to see the login information.

Option 2: shell variables

Set those shell variables:

  • NETIO_LOGIN - a username
  • NETIO_PASSWORD - the appropriate password

You might also want to set the HISTFILE variable (depending on your shell) to hide the command including the password in the history:

$ HISTFILE="" NETIO_LOGIN=admin NETIO_PASSWORD=pass ./ -s mynetio -n

Option 3: auth file

A better possibility is to create a authfile with permisions 0600. Just enter the username in the first line and the password in the second line:

$ cat authfile
$ chmod 0600 authfile

Hand the path to the script:

$ ./ -a myauthfile -s mynetio -n

The scripts will abort if the authfile has insecure permissions (e.g. 0777).