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"""
Walk Agent over IPv6
++++++++++++++++++++
Send a series of SNMP GETNEXT requests with the following options:
* with SNMPv3 with user 'usr-md5-none', MD5 auth and no privacy protocols
* over IPv6/UDP
* to an Agent at [::1]: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 -v3 -l authNoPriv -u usr-md5-none -A authkey1 -ObentU udp6:[::1]:161 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 udp6
from pysnmp.entity.rfc3413 import cmdgen
# Create SNMP engine instance
snmpEngine = engine.SnmpEngine()
#
# SNMPv3/USM setup
#
# user: usr-md5-des, 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/IPv6
config.addTransport(
snmpEngine, udp6.domainName, udp6.Udp6SocketTransport().openClientMode()
)
config.addTargetAddr(snmpEngine, "my-router", udp6.domainName, ("::1", 161), "my-creds")
# Error/response receiver
# noinspection PyUnusedLocal,PyUnusedLocal,PyUnusedLocal
def cbFun(
snmpEngine,
sendRequestHandle,
errorIndication,
errorStatus,
errorIndex,
varBindTable,
cbCtx,
):
if errorIndication:
print(errorIndication)
return
if errorStatus:
print(
"{} at {}".format(
errorStatus.prettyPrint(),
errorIndex and varBindTable[-1][int(errorIndex) - 1][0] or "?",
)
)
return # stop on error
for varBindRow in varBindTable:
for oid, val in varBindRow:
print(f"{oid.prettyPrint()} = {val.prettyPrint()}")
return True # signal dispatcher to continue
# Prepare initial request to be sent
cmdgen.NextCommandGenerator().sendVarBinds(
snmpEngine,
"my-router",
None,
"", # contextEngineId, contextName
[((1, 3, 6, 1, 2, 1, 1), None), ((1, 3, 6, 1, 4, 1, 1), None)],
cbFun,
)
# Run I/O dispatcher which would send pending queries and process responses
snmpEngine.transportDispatcher.runDispatcher()
|
