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#
# GETNEXT Command Generator
#
# Send a series of SNMP GETNEXT requests
# with SNMPv1, community 'public'
# over IPv4/UDP
# to an Agent at 195.218.195.228:161
# for two OIDs in tuple form
# stop on end-of-mib condition for both OIDs
#
# This script performs similar to the following Net-SNMP command:
#
# $ snmpwalk -v1 -c public -ObentU 195.218.195.228 1.3.6.1.2.1.1 1.3.6.1.4.1.1
#
from pysnmp.entity import engine, config
from pysnmp.carrier.asyncore.dgram import udp
from pysnmp.entity.rfc3413 import cmdgen
from pysnmp.smi import compiler, view, rfc1902
# Create SNMP engine instance
snmpEngine = engine.SnmpEngine()
# Attach MIB compiler to SNMP Engine (MIB Builder)
# This call will fail if PySMI is not present on the system
compiler.addMibCompiler(snmpEngine.getMibBuilder())
# ... alternatively, this call will not complain on missing PySMI
#compiler.addMibCompiler(snmpEngine.getMibBuilder(), ifAvailable=True)
# Used for MIB objects resolution
mibViewController = view.MibViewController(snmpEngine.getMibBuilder())
#
#
# SNMPv1/2c 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', 1)
#
# Setup transport endpoint and bind it with security settings yielding
# a target name
#
# UDP/IPv4
config.addTransport(
snmpEngine,
udp.domainName,
udp.UdpSocketTransport().openClientMode()
)
config.addTargetAddr(
snmpEngine, 'my-router',
udp.domainName, ('195.218.195.228', 161),
'my-creds'
)
# Error/response receiver
def cbFun(snmpEngine, sendRequestHandle, errorIndication,
errorStatus, errorIndex, varBindTable, cbCtx):
if errorIndication:
print(errorIndication)
return
# SNMPv1 response may contain noSuchName error *and* SNMPv2c exception,
# so we ignore noSuchName error here
if errorStatus and errorStatus != 2:
print('%s at %s' % (
errorStatus.prettyPrint(),
errorIndex and varBindTable[-1][int(errorIndex)-1][0] or '?'
)
)
return # stop on error
for varBindRow in varBindTable:
for varBind in varBindRow:
print(rfc1902.ObjectType(rfc1902.ObjectIdentity(varBind[0]), varBind[1]).resolveWithMib(mibViewController).prettyPrint())
return 1 # signal dispatcher to continue
# Prepare initial request to be sent
cmdgen.NextCommandGenerator().sendVarBinds(
snmpEngine,
'my-router',
None, '', # contextEngineId, contextName
[ rfc1902.ObjectType(rfc1902.ObjectIdentity('iso.org.dod')).resolveWithMib(mibViewController),
rfc1902.ObjectType(rfc1902.ObjectIdentity('IF-MIB', 'ifMIB')).resolveWithMib(mibViewController) ],
cbFun
)
# Run I/O dispatcher which would send pending queries and process responses
snmpEngine.transportDispatcher.runDispatcher()
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