SNMP Trap Handling with Nagios
By Francois Meehan, January 24, 2005
My company has been very successful in providing network-monitoring solutions based on Nagios/Netsaint. For environments that required SNMP trap handling, however, the technique suggested in Nagios's documentation was too cumbersome. That technique requires coding for each individual trap message that needs to be monitored and, for those clients, we could only suggest making use of commercial solutions, all of which come with high price tags and complicated implementations.
Listing 1 snmptraphandling.py
#!/usr/bin/python -u
"""
Written by Francois Meehan (Cedval Info)
First release 2004/09/15
This script receives input from sec.pl concerning translated snmptraps
*** Important note: sec must send DATA within quotes
Ex: ./services.py $1 $2 $3
"""
import commands, string, os, sys, time
global return_code
def check_arg():
try:
host = sys.argv[1]
except:
print "usage: services.py <HOST> <SEVERITY> <DATA>"
sys.exit()
try:
severity = sys.argv[2]
except:
print "usage: services.py <HOST> <SEVERITY> <DATA>"
sys.exit()
try:
mondata_res = sys.argv[3]
except:
print "usage: services.py <HOST> <SEVERITY> <DATA>"
sys.exit()
return (host, severity, mondata_res)
def post_results(host, mondata_res, return_code, service_suffix):
mytime = time.time()
mytime = str(mytime)
mytime = mytime[:-3]
mondata_res = '" ' + mondata_res + '" '
#print mondata_res
output = open('/var/nagios/rw/nagios.cmd', 'w')
results = "[" + mytime + "] " + "PROCESS_SERVICE_CHECK_RESULT;" \
+ host + ";" + "snmp_trap_handling_" + service_suffix + ";" \
+ return_code + ";" + mondata_res + "\n"
output.write(results)
def get_return_code():
if severity == "INFORMATIONAL":
return_code = "0"
service_suffix = "ok"
elif severity == "Normal":
return_code = "0"
service_suffix = "ok"
elif severity == "SEVERE":
return_code = "2"
service_suffix = "critical"
elif severity == "MAJOR":
return_code = "2"
service_suffix = "critical"
elif severity == "CRITICAL":
return_code = "2"
service_suffix = "critical"
elif severity == "WARNING":
return_code = "1"
service_suffix = "warning"
elif severity == "MINOR":
return_code = "1"
service_suffix = "warning"
return return_code, service_suffix
# Main routine...
if __name__ == '__main__':
(host, severity, mondata_res) = check_arg() # validating
# parameters
return_code, service_suffix = get_return_code()
post_results(host, mondata_res, return_code, service_suffix)
