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"""
Send packets from specific local interface
++++++++++++++++++++++++++++++++++++++++++
Send a series of SNMP GETNEXT requests with the following options:
* with SNMPv2c, community 'public'
* over IPv4/UDP
* to an Agent at 127.0.0.1:161
* sending packets from primary local interface 0.0.0.0, local port 61024
* 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 -v2c -c public -ObentU 127.0.0.1 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
# Create SNMP engine instance
snmpEngine = engine.SnmpEngine()
#
# SNMPv1/2c setup (if you use SNMPv1 or v2c)
#
# 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.UdpSocketTransport().openClientMode(("0.0.0.0", 61024)),
)
config.addTargetAddr(
snmpEngine, "my-router", udp.domainName, ("127.0.0.1", 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 1 # 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, 2, 1, 11), None)],
cbFun,
)
# Run I/O dispatcher which would send pending queries and process responses
snmpEngine.transportDispatcher.runDispatcher()
|
