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|
"""
Fetch scalar value
++++++++++++++++++
Send SNMP GET request with the following options:
* with SNMPv2c, community 'public'
* using Asyncio framework for network transport
* over IPv4/UDP
* to an Agent at 195.218.195.228:161
* wait 3 seconds for response, retry 5 times (plus one initial attempt)
* for an OID in string form
This script performs similar to the following Net-SNMP command:
| $ snmpget -v2c -c public -ObentU -r 5 -t 1 195.218.195.228 1.3.6.1.2.1.1.1.0
Requires Python 3.4 and later!
"""#
from pysnmp.carrier.asyncio.dgram import udp
from pysnmp.entity.rfc3413.asyncio import cmdgen
from pysnmp.entity import engine, config
import asyncio
# Get the event loop for this thread
loop = asyncio.get_event_loop()
# Create SNMP engine instance
snmpEngine = engine.SnmpEngine()
#
# SNMPv2c 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.UdpTransport().openClientMode()
)
config.addTargetAddr(
snmpEngine, 'my-router',
udp.domainName, ('195.218.195.228', 161),
'my-creds',
timeout=300, # in 1/100 sec
retryCount=5
)
@asyncio.coroutine
def snmpOperation(snmpEngine, target, contextEngineId, contextName, varBinds):
( snmpEngine,
errorIndication,
errorStatus,
errorIndex,
varBinds ) = yield from cmdgen.GetCommandGenerator().sendVarBinds(
snmpEngine,
target,
contextEngineId,
contextName,
varBinds
)
if errorIndication:
print(errorIndication)
elif errorStatus:
print('%s at %s' % (
errorStatus.prettyPrint(),
errorIndex and varBinds[int(errorIndex)-1][0] or '?'
)
)
else:
for oid, val in varBinds:
print('%s = %s' % (oid.prettyPrint(), val.prettyPrint()))
# This also terminates internal timer
config.delTransport(
snmpEngine,
udp.domainName
).closeTransport()
loop.run_until_complete(
snmpOperation(
snmpEngine,
'my-router',
None, '', # contextEngineId, contextName
( ('1.3.6.1.2.1.1.1.0', None), )
)
)
loop.close()
|
