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"""
Sending notification with OBJECT's
++++++++++++++++++++++++++++++++++
Send SNMP TRAP notification using the following options:
* SNMPv2c
* with community name 'public'
* over IPv4/UDP
* send TRAP notification
* to a Manager at 127.0.0.1:162
* with TRAP ID IF-MIB::ifLink as MIB symbol
The IF-MIB::ifLink NOTIFICATION-TYPE implies including four other
var-binds into the notification message describing the incident
occurred. These var-binds are:
IF-MIB::ifIndex."x"
IF-MIB::ifAdminStatus."x"
IF-MIB::ifOperStatus."x"
IF-MIB::ifDescr."x"
Where "x" is MIB table index (instance index).
Functionally similar to:
| $ snmptrap -v2c -c public 127.0.0.1 0 1.3.6.1.6.3.1.1.5.3 IF-MIB::ifIndex."1" IF-MIB::ifAdminStatus."1" IF-MIB::ifOperStatus."1" IF-MIB::ifDescr."1"
"""#
from pysnmp.entity import engine, config
from pysnmp.carrier.asyncore.dgram import udp
from pysnmp.entity.rfc3413 import ntforg
from pysnmp.smi import rfc1902, view
#
# Here we fill in some values for Managed Objects Instances (invoked
# later while building TRAP message) by NOTIFICATION-TYPE macro evaluation.
# In real Agent app, these values should already be initialized during
# Agent runtime.
#
instanceIndex = (1,)
objects = {
("IF-MIB", "ifIndex"): instanceIndex[0],
("IF-MIB", "ifAdminStatus"): "up",
("IF-MIB", "ifOperStatus"): "down",
("IF-MIB", "ifDescr"): "eth0",
}
# Create SNMP engine instance
snmpEngine = engine.SnmpEngine()
# MIB view controller is used for MIB lookup purposes
mibViewController = view.MibViewController(snmpEngine.getMibBuilder())
# SecurityName <-> CommunityName mapping
config.addV1System(snmpEngine, "my-area", "public", transportTag="all-my-managers")
# Specify security settings per SecurityName (SNMPv2c -> 1)
config.addTargetParams(snmpEngine, "my-creds", "my-area", "noAuthNoPriv", 1)
# Setup transport endpoints and bind it with security settings yielding
# a target name:
# UDP/IPv4
config.addTransport(
snmpEngine, udp.domainName, udp.UdpSocketTransport().openClientMode()
)
config.addTargetAddr(
snmpEngine,
"my-nms-1",
udp.domainName,
("127.0.0.1", 162),
"my-creds",
tagList="all-my-managers",
)
# Specify what kind of notification should be sent (TRAP or INFORM),
# to what targets (chosen by tag) and what filter should apply to
# the set of targets (selected by tag)
config.addNotificationTarget(
snmpEngine, "my-notification", "my-filter", "all-my-managers", "trap"
)
# Allow NOTIFY access to Agent's MIB by this SNMP model (2), securityLevel
# and SecurityName
config.addContext(snmpEngine, "")
config.addVacmUser(snmpEngine, 2, "my-area", "noAuthNoPriv", (), (), (1, 3, 6))
# *** SNMP engine configuration is complete by this line ***
# Create Notification Originator App instance.
ntfOrg = ntforg.NotificationOriginator()
# Build and submit notification message to dispatcher
ntfOrg.sendVarBinds(
snmpEngine,
"my-notification", # notification targets
None,
"", # contextEngineId, contextName
rfc1902.NotificationType(
rfc1902.ObjectIdentity("IF-MIB", "linkUp"),
instanceIndex=instanceIndex,
objects=objects,
).resolveWithMib(mibViewController),
)
print("Notification is scheduled to be sent")
# Run I/O dispatcher which would send pending message and process response
snmpEngine.transportDispatcher.runDispatcher()
|
