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"""
Pull MIB subtree
++++++++++++++++
Send a series of SNMP GETNEXT requests
* with SNMPv3 with user 'usr-none-none', no auth and no privacy protocols
* over IPv4/UDP
* to an Agent at 195.218.195.228:161
* for an OID in string form
* stop whenever received OID goes out of initial prefix (it may be a table)
This script performs similar to the following Net-SNMP command:
| $ snmpwalk -v3 -l noAuthNoPriv -u usr-none-none -ObentU 195.218.195.228:161 1.3.6.1.2.1.1
"""#
from pysnmp.entity import engine, config
from pysnmp.carrier.asyncore.dgram import udp
from pysnmp.entity.rfc3413 import cmdgen
from pysnmp.proto import rfc1902
# Initial OID prefix
initialOID = rfc1902.ObjectName('1.3.6.1.2.1.1')
# Create SNMP engine instance
snmpEngine = engine.SnmpEngine()
#
# SNMPv3/USM setup
#
# user: usr-none-none, auth: none, priv: none
config.addV3User(
snmpEngine, 'usr-none-none',
)
config.addTargetParams(snmpEngine, 'my-creds', 'usr-none-none', 'noAuthNoPriv')
#
# 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
if errorStatus:
print('%s at %s' % (
errorStatus.prettyPrint(),
errorIndex and varBindTable[-1][int(errorIndex)-1][0] or '?'
)
)
return # stop on error
for varBindRow in varBindTable:
for oid, val in varBindRow:
if initialOID.isPrefixOf(oid):
print('%s = %s' % (oid.prettyPrint(), val.prettyPrint()))
else:
return False # signal dispatcher to stop
return True # signal dispatcher to continue
# Prepare initial request to be sent
cmdgen.NextCommandGenerator().sendVarBinds(
snmpEngine,
'my-router',
None, '', # contextEngineId, contextName
[ (initialOID, None) ],
cbFun
)
# Run I/O dispatcher which would send pending queries and process responses
snmpEngine.transportDispatcher.runDispatcher()
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