Hey there,
I want to monitor reachability of DICOM-Servers, which can be done via a nagios plugin. I was able to run it from the command line:
./check_dcm.py -H 192.168.11.11 -p 104
DICOM OK - Association Accepted
echo $?
0
So this should work. Equally, if I change the port to something that does not exist, it fails like expected:
./check_dcm.py -H 192.168.11.11 -p 11114
DICOM CRITICAL - Association Request Failed
echo $?
2
Within the LibreNMS Webinterface I was able to pick dcm.py as Service, added 192.168.11.11 as host and -p 104 as argument. This makes the Service go yellow and not display any output…
Can someone help? Thank you so much in advance 
This is the check_dcm.py I am using:
#!/usr/bin/python
#
# check_dcm.py
# Nagios/Icinga plugin to check DICOM services.
#
# The script is a wrapper for dcmtk's (http://dicom.offis.de/dcmtk.php.en) echoscu
# to monitor STORE SCP. It will have to be installed (or the binary built) on the
# nagios system. Easiest way on an ubuntu system is to use apt:
#
# sudo apt-get install dcmtk
#
# Usage:
# You can hard code your port/ae_title but I prefer to use object variables as below
# (http://nagios.sourceforge.net/docs/3_0/customobjectvars.html)
#
# define command {
# command_name check_dcm
# command_line $USER1$/check_dcm -H $HOSTADDRESS$ -p $_HOSTPORT$ -a $_HOSTAE_TITLE$ -v
# }
import subprocess
import sys
import argparse
# Version
VERSION = '0.2.0'
# Exit Codes
STATE_OK = 0
STATE_WARNING = 1
STATE_CRITICAL = 2
STATE_UNKNOWN = 3
# Arguments
parser = argparse.ArgumentParser()
parser.add_argument("-V", "--version", action="store_true", help="display plugin version")
parser.add_argument("-v", "--verbosity", action="count", default=0, help="increase output verbosity")
parser.add_argument("-t", "--timeout", default='10', help="seconds before request timeout")
parser.add_argument("-aet", "--aetitle", help="calling AE Title (default: ECHOSCU)")
parser.add_argument("-aec", "--call", help="ae title of modality (default: ANY-SCP)")
parser.add_argument("-H", "--hostname", help="hostname of modality")
parser.add_argument("-p", "--port", default='104', help="tcp/ip port number of modality")
try:
args = parser.parse_args()
except SystemExit(e):
# bad args, so service state unknown
sys.exit(STATE_UNKNOWN)
raise e
if args.version:
# service state unknown, but here's your version number.
print(VERSION)
sys.exit(STATE_UNKNOWN)
# build command line arguments
cmd = ['/usr/bin/echoscu']
if args.verbosity >= 3:
cmd.append('--debug')
elif args.verbosity == 2:
cmd.append('--verbose')
if args.timeout:
cmd.append('-to')
cmd.append(args.timeout)
if args.aetitle:
cmd.append('-aet')
cmd.append(args.aetitle)
if args.call:
cmd.append('-aec')
cmd.append(args.call)
cmd.append(args.hostname)
cmd.append(args.port)
# send out a dicom ping and see what comes back
try:
p = subprocess.Popen(cmd, stdout=subprocess.PIPE, stderr=subprocess.STDOUT)
except Exception(e):
sys.exit(STATE_UNKNOWN)
else:
stdout = p.communicate()[0]
if p.returncode:
if args.verbosity:
print("DICOM CRITICAL - Association Request Failed (TCP Initialization Error: Connection refused)")
if args.verbosity > 1:
for line in stdout.splitlines():
print(line)
else:
print("DICOM CRITICAL - Association Request Failed")
sys.exit(STATE_CRITICAL)
else:
if args.verbosity:
print("DICOM OK - Association Accepted (Received Echo Response (Status: Success))")
if args.verbosity > 1:
for line in stdout.splitlines():
print(line)
else:
print("DICOM OK - Association Accepted")
sys.exit(STATE_OK)