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##
# Asynchronous Command Generator
#
# Send a bunch of SNMP GETNEXT requests all at once using the following options:
#
# * with SNMPv1, community 'public' and
# with SNMPv2c, community 'public' and
# with SNMPv3, user 'usr-md5-des', MD5 auth and DES privacy
# * over IPv4/UDP and
# over IPv6/UDP
# * to an Agent at demo.snmplabs.com:161 and
# to an Agent at [::1]:161
# * for multiple MIB subtrees and tables
#
from pysnmp.entity import engine
from pysnmp.entity.rfc3413.oneliner import cmdgen
# List of targets in the followin format:
# ( ( authData, transportTarget, varNames ), ... )
targets = (
# 1-st target (SNMPv1 over IPv4/UDP)
( cmdgen.CommunityData('public', mpModel=0),
cmdgen.UdpTransportTarget(('demo.snmplabs.com', 161)),
( cmdgen.ObjectType(cmdgen.ObjectIdentity('1.3.6.1.2.1')),
cmdgen.ObjectType(cmdgen.ObjectIdentity('1.3.6.1.3.1')) ) ),
# 2-nd target (SNMPv2c over IPv4/UDP)
( cmdgen.CommunityData('public'),
cmdgen.UdpTransportTarget(('demo.snmplabs.com', 161)),
( cmdgen.ObjectType(cmdgen.ObjectIdentity('1.3.6.1.4.1')), ) ),
# 3-nd target (SNMPv3 over IPv4/UDP)
( cmdgen.UsmUserData('usr-md5-des', 'authkey1', 'privkey1'),
cmdgen.UdpTransportTarget(('demo.snmplabs.com', 161)),
( cmdgen.ObjectType(cmdgen.ObjectIdentity('SNMPv2-MIB', 'system')), ) ),
# 4-th target (SNMPv3 over IPv6/UDP)
( cmdgen.UsmUserData('usr-md5-none', 'authkey1'),
cmdgen.Udp6TransportTarget(('::1', 161)),
( cmdgen.ObjectType(cmdgen.ObjectIdentity('IF-MIB', 'ifTable')), ) )
# N-th target
# ...
)
# Wait for responses or errors, submit GETNEXT requests for further OIDs
def cbFun(snmpEngine, sendRequestHandle, errorIndication,
errorStatus, errorIndex, varBindTable, cbCtx):
(varBindHead, authData, transportTarget) = cbCtx
print('%s via %s' % (authData, transportTarget))
if errorIndication:
print(errorIndication)
return
if errorStatus:
print('%s at %s' % (
errorStatus.prettyPrint(),
errorIndex and varBindTable[-1][int(errorIndex)-1][0] or '?'
)
)
return
varBindTableRow = varBindTable[-1]
for idx in range(len(varBindTableRow)):
name, val = varBindTableRow[idx]
if val is not None and varBindHead[idx] <= name:
# still in table
break
else:
print('went out of table at %s' % (name, ))
return
for varBindRow in varBindTable:
for oid, val in varBindRow:
if val is None:
print(oid.prettyPrint())
else:
print('%s = %s' % (oid.prettyPrint(), val.prettyPrint()))
return True # continue table retrieval
snmpEngine = engine.SnmpEngine()
cmdGen = cmdgen.AsyncCommandGenerator()
# Submit initial GETNEXT requests and wait for responses
for authData, transportTarget, varBinds in targets:
varBindHead = [ x[0] for x in cmdGen.makeVarBinds(snmpEngine, varBinds ) ]
cmdGen.nextCmd(
snmpEngine, authData, transportTarget, cmdgen.ContextData(), varBinds,
# User-space callback function and its context
(cbFun, (varBindHead, authData, transportTarget)),
lookupNames=True, lookupValues=True
)
snmpEngine.transportDispatcher.runDispatcher()
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