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|
"""
Observe SNMP engine internal operations
+++++++++++++++++++++++++++++++++++++++
Receive SNMP TRAP/INFORM messages with the following options:
* SNMPv1/SNMPv2c
* with SNMP community "public"
* over IPv4/UDP, listening at 127.0.0.1:162
over IPv6/UDP, listening at [::1]:162
* registers its own execution observer to snmpEngine
* print received data on stdout
Either of the following Net-SNMP commands will send notifications to this
receiver:
| $ snmptrap -v1 -c public 127.0.0.1 1.3.6.1.4.1.20408.4.1.1.2 127.0.0.1 1 1 123 1.3.6.1.2.1.1.1.0 s test
| $ snmptrap -v2c -c public udp6:[::1]:162 123 1.3.6.1.6.3.1.1.5.1 1.3.6.1.2.1.1.5.0 s test
| $ snmpinform -v2c -c public 127.0.0.1 123 1.3.6.1.6.3.1.1.5.1
"""#
from pysnmp.entity import engine, config
from pysnmp.carrier.asyncore.dgram import udp, udp6
from pysnmp.entity.rfc3413 import ntfrcv
# Create SNMP engine with autogenernated engineID and pre-bound
# to socket transport dispatcher
snmpEngine = engine.SnmpEngine()
# Execution point observer setup
# Register a callback to be invoked at specified execution point of
# SNMP Engine and passed local variables at code point's local scope
# noinspection PyUnusedLocal,PyUnusedLocal
def requestObserver(snmpEngine, execpoint, variables, cbCtx):
print("Execution point: %s" % execpoint)
print(
"* transportDomain: %s"
% ".".join([str(x) for x in variables["transportDomain"]])
)
print(
"* transportAddress: %s"
% "@".join([str(x) for x in variables["transportAddress"]])
)
print("* securityModel: %s" % variables["securityModel"])
print("* securityName: %s" % variables["securityName"])
print("* securityLevel: %s" % variables["securityLevel"])
print("* contextEngineId: %s" % variables["contextEngineId"].prettyPrint())
print("* contextName: %s" % variables["contextName"].prettyPrint())
print("* PDU: %s" % variables["pdu"].prettyPrint())
snmpEngine.observer.registerObserver(
requestObserver, "rfc3412.receiveMessage:request", "rfc3412.returnResponsePdu"
)
# Transport setup
# UDP over IPv4
config.addTransport(
snmpEngine, udp.domainName, udp.UdpTransport().openServerMode(("127.0.0.1", 162))
)
# UDP over IPv6
config.addTransport(
snmpEngine, udp6.domainName, udp6.Udp6Transport().openServerMode(("::1", 162))
)
# SNMPv1/2c setup
# SecurityName <-> CommunityName mapping
config.addV1System(snmpEngine, "my-area", "public")
# Callback function for receiving notifications
# noinspection PyUnusedLocal,PyUnusedLocal,PyUnusedLocal
def cbFun(snmpEngine, stateReference, contextEngineId, contextName, varBinds, cbCtx):
print(
'Notification from ContextEngineId "{}", ContextName "{}"'.format(
contextEngineId.prettyPrint(), contextName.prettyPrint()
)
)
for name, val in varBinds:
print(f"{name.prettyPrint()} = {val.prettyPrint()}")
# Register SNMP Application at the SNMP engine
ntfrcv.NotificationReceiver(snmpEngine, cbFun)
snmpEngine.transportDispatcher.jobStarted(1) # this job would never finish
# Run I/O dispatcher which would receive queries and send confirmations
try:
snmpEngine.transportDispatcher.runDispatcher()
except:
snmpEngine.observer.unregisterObserver()
snmpEngine.transportDispatcher.closeDispatcher()
raise
|
