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#
# GET Command Generator
#
# Send a SNMP GET request
# with SNMPv3 with user 'usr-md5-none', SHA auth and no privacy protocols
# for MIB instance identified by contextEngineId: 8000000001020304,
# contextName: my-context
# using Twisted framework for network transport
# over IPv4/UDP
# to an Agent at 127.0.0.1:161
# for an OID in tuple form
#
# This script performs similar to the following Net-SNMP command:
#
# $ snmpget -v3 -l authNoPriv -u usr-md5-none -A authkey1 -E 8000000001020304 -n my-context -ObentU 127.0.0.1:161 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.proto import rfc1902
from pysnmp.carrier.twisted import dispatch
from pysnmp.carrier.twisted.dgram import udp
# Create SNMP engine instance
snmpEngine = engine.SnmpEngine()
# Instantiate and register Twisted dispatcher at SNMP engine
snmpEngine.registerTransportDispatcher(dispatch.TwistedDispatcher())
#
# SNMPv3/USM setup
#
# user: usr-md5-none, auth: MD5, priv: NONE
config.addV3User(
snmpEngine, 'usr-md5-none',
config.usmHMACMD5AuthProtocol, 'authkey1'
)
config.addTargetParams(snmpEngine, 'my-creds', 'usr-md5-none', 'authNoPriv')
#
# Setup transport endpoint and bind it with security settings yielding
# a target name
#
# UDP/IPv4
config.addSocketTransport(
snmpEngine,
udp.domainName,
udp.UdpTwistedTransport().openClientMode()
)
config.addTargetAddr(
snmpEngine, 'my-router',
udp.domainName, ('127.0.0.1', 161),
'my-creds'
)
# Error/response receiver
def cbFun(cbCtx):
(errorIndication, errorStatus, errorIndex, varBinds) = cbCtx
if errorIndication:
print(errorIndication)
elif errorStatus:
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().sendReq(
snmpEngine,
'my-router',
( ('1.3.6.1.2.1.1.1.0', None), ),
contextEngineId=rfc1902.OctetString(hexValue='8000000001020304'),
contextName=rfc1902.OctetString('my-context')
)
# Register error/response receiver function at deferred
df.addCallback(cbFun)
# Run Twisted main loop
reactor.run()
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