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|
#
# GET Command Generator
#
# Send a SNMP GET request
# with SNMPv1, community 'public'
# using Twisted framework for network transport
# over IPv4/UDP
# to an Agent at 195.218.195.228:161
# for an OID in tuple form
#
# This script performs similar to the following Net-SNMP command:
#
# $ snmpget -v1 -c public -ObentU 195.218.195.228 1.3.6.1.2.1.1.1.0
#
from twisted.internet import reactor, defer
from pysnmp.entity import engine, config
from pysnmp.entity.rfc3413.twisted import cmdgen
from pysnmp.carrier.twisted.dgram import udp
# Create SNMP engine instance
snmpEngine = engine.SnmpEngine()
#
# SNMPv1 setup
#
# SecurityName <-> CommunityName mapping
config.addV1System(snmpEngine, 'my-area', 'public')
# Specify security settings per SecurityName (SNMPv1 - 0, SNMPv2c - 1)
config.addTargetParams(snmpEngine, 'my-creds', 'my-area', 'noAuthNoPriv', 0)
#
# Setup transport endpoint and bind it with security settings yielding
# a target name
#
# UDP/IPv4
config.addTransport(
snmpEngine,
udp.domainName,
udp.UdpTwistedTransport().openClientMode()
)
config.addTargetAddr(
snmpEngine, 'my-router',
udp.domainName, ('195.218.195.228', 161),
'my-creds'
)
# Error/response receiver
def cbFun(response, *args):
snmpEngine, errorIndication, errorStatus, errorIndex, varBinds = response
if errorIndication:
print(errorIndication)
# SNMPv1 response may contain noSuchName error *and* SNMPv2c exception,
# so we ignore noSuchName error here
elif errorStatus and errorStatus != 2:
print('%s at %s' % (
errorStatus.prettyPrint(),
errorIndex and varBinds[int(errorIndex)-1][0] or '?'
)
)
else:
for oid, val in varBinds:
print('%s = %s' % (oid.prettyPrint(), val.prettyPrint()))
reactor.stop()
# Prepare request to be sent yielding Twisted deferred object
df = cmdgen.GetCommandGenerator().sendVarBinds(
snmpEngine,
'my-router',
None, '', # contextEngineId, contextName
[ ('1.3.6.1.2.1.1.1.0', None), ('1.3.6.1.2.1.1.2.0', None) ]
)
# Register error/response receiver function at deferred
df.addCallback(cbFun)
# Run Twisted main loop
reactor.run()
|
