Transport tweaks#
TRAP over multiple transports#
The following script sends two SNMP TRAP notification using the following options:
with SNMPv1
with community name ‘public’
over IPv4/UDP and IPv6/UDP
send TRAP notification
to a Manager at demo.pysnmp.com:162 and [::1]
with TRAP ID ‘coldStart’ specified as an OID
include managed objects information:
with default Uptime value
with default Agent Address with ‘127.0.0.1’
overriding Enterprise OID with 1.3.6.1.4.1.20408.4.1.1.2
The following Net-SNMP commands will produce similar SNMP notification:
from pysnmp.carrier.asyncio.dispatch import AsyncioDispatcher
from pysnmp.carrier.asyncio.dgram import udp, udp6
from pyasn1.codec.ber import encoder
from pysnmp.proto import api
# Protocol version to use
pMod = api.protoModules[api.protoVersion1]
# pMod = api.protoModules[api.protoVersion2c]
# Build PDU
trapPDU = pMod.TrapPDU()
pMod.apiTrapPDU.setDefaults(trapPDU)
# Traps have quite different semantics across proto versions
if pMod == api.protoModules[api.protoVersion1]:
pMod.apiTrapPDU.setEnterprise(trapPDU, (1, 3, 6, 1, 1, 2, 3, 4, 1))
pMod.apiTrapPDU.setGenericTrap(trapPDU, "coldStart")
# Build message
trapMsg = pMod.Message()
pMod.apiMessage.setDefaults(trapMsg)
pMod.apiMessage.setCommunity(trapMsg, "public")
pMod.apiMessage.setPDU(trapMsg, trapPDU)
transportDispatcher = AsyncioDispatcher()
# UDP/IPv4
transportDispatcher.registerTransport(
udp.domainName, udp.UdpAsyncioTransport().openClientMode()
)
transportDispatcher.sendMessage(
encoder.encode(trapMsg), udp.domainName, ("demo.pysnmp.com", 162)
)
# UDP/IPv6
transportDispatcher.registerTransport(
udp6.domainName, udp6.Udp6AsyncioTransport().openClientMode()
)
transportDispatcher.sendMessage(encoder.encode(trapMsg), udp6.domainName, ("::1", 162))
## Local domain socket
# transportDispatcher.registerTransport(
# unix.domainName, unix.UnixSocketTransport().openClientMode()
# )
# transportDispatcher.sendMessage(
# encoder.encode(trapMsg), unix.domainName, '/tmp/snmp-manager'
# )
# Dispatcher will finish as all scheduled messages are sent
transportDispatcher.runDispatcher(3)
transportDispatcher.closeDispatcher()
Download
script.
INFORM over multiple transports#
The following script sends SNMP INFORM notification using the following options:
with SNMPv2c
with community name ‘public’
over IPv4/UDP and IPv6/UDP
send INFORM notification
to a Manager at demo.pysnmp.com:162 and [::1]:162
with TRAP ID ‘coldStart’ specified as an OID
The following Net-SNMP command will produce similar SNMP notification:
from pysnmp.carrier.asyncio.dispatch import AsyncioDispatcher
from pysnmp.carrier.asyncio.dgram import udp, udp6
from pyasn1.codec.ber import encoder, decoder
from pysnmp.proto.api import v2c as pMod
# Build PDU
reqPDU = pMod.InformRequestPDU()
pMod.apiTrapPDU.setDefaults(reqPDU)
# Build message
trapMsg = pMod.Message()
pMod.apiMessage.setDefaults(trapMsg)
pMod.apiMessage.setCommunity(trapMsg, "public")
pMod.apiMessage.setPDU(trapMsg, reqPDU)
# noinspection PyUnusedLocal,PyUnusedLocal
def cbRecvFun(
transportDispatcher, transportDomain, transportAddress, wholeMsg, reqPDU=reqPDU
):
while wholeMsg:
rspMsg, wholeMsg = decoder.decode(wholeMsg, asn1Spec=pMod.Message())
rspPDU = pMod.apiMessage.getPDU(rspMsg)
# Match response to request
if pMod.apiPDU.getRequestID(reqPDU) == pMod.apiPDU.getRequestID(rspPDU):
# Check for SNMP errors reported
errorStatus = pMod.apiPDU.getErrorStatus(rspPDU)
if errorStatus:
print(errorStatus.prettyPrint())
else:
print("INFORM message delivered, response var-binds follow")
for oid, val in pMod.apiPDU.getVarBinds(rspPDU):
print(f"{oid.prettyPrint()} = {val.prettyPrint()}")
transportDispatcher.jobFinished(1)
return wholeMsg
transportDispatcher = AsyncioDispatcher()
transportDispatcher.registerRecvCbFun(cbRecvFun)
# UDP/IPv4
transportDispatcher.registerTransport(
udp.domainName, udp.UdpAsyncioTransport().openClientMode()
)
transportDispatcher.sendMessage(
encoder.encode(trapMsg), udp.domainName, ("demo.pysnmp.com", 162)
)
transportDispatcher.jobStarted(1)
# UDP/IPv6
# transportDispatcher.registerTransport(
# udp6.domainName, udp6.Udp6AsyncioTransport().openClientMode()
# )
# transportDispatcher.sendMessage(
# encoder.encode(trapMsg), udp6.domainName, ('::1', 162)
# )
# transportDispatcher.jobStarted(1)
# Dispatcher will finish as all scheduled messages are sent
transportDispatcher.runDispatcher(3)
transportDispatcher.closeDispatcher()
Download
script.
See also: library reference.