1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
|
"""
Custom MIB Controller
+++++++++++++++++++++
Listen and respond to SNMP GET/SET/GETNEXT/GETBULK queries with
the following options:
* SNMPv3
* with USM username usr-none-none
* using alternative set of Managed Objects addressed by
contextName: my-context
* allow access to SNMPv2-MIB objects (1.3.6.1.2.1)
* over IPv4/UDP, listening at 127.0.0.1:161
The following Net-SNMP command will send GET request to this Agent:
| $ snmpget -v3 -u usr-none-none -l noAuthNoPriv -n my-context -Ir 127.0.0.1 sysDescr.0
"""#
from pysnmp.entity import engine, config
from pysnmp.entity.rfc3413 import cmdrsp, context
from pysnmp.carrier.asyncore.dgram import udp
from pysnmp.smi import instrum
from pysnmp.proto.api import v2c
# Create SNMP engine
snmpEngine = engine.SnmpEngine()
# Transport setup
# UDP over IPv4
config.addTransport(
snmpEngine,
udp.domainName,
udp.UdpTransport().openServerMode(('127.0.0.1', 161))
)
# SNMPv3/USM setup
# user: usr-none-none, auth: NONE, priv NONE
config.addV3User(
snmpEngine, 'usr-none-none'
)
# Allow full MIB access for each user at VACM
config.addVacmUser(snmpEngine, 3, 'usr-none-none', 'noAuthNoPriv', (1,3,6,1,2,1), (1,3,6,1,2,1))
# Create an SNMP context
snmpContext = context.SnmpContext(snmpEngine)
# Very basic Management Instrumentation Controller without
# any Managed Objects attached. It supports only GET's and
# always echos request var-binds in response.
class EchoMibInstrumController(instrum.AbstractMibInstrumController):
def readVars(self, vars, acInfo=(None, None)):
return [ (ov[0], v2c.OctetString('You queried OID %s' % ov[0])) for ov in vars]
# Create a custom Management Instrumentation Controller and register at
# SNMP Context under ContextName 'my-context'
snmpContext.registerContextName(
v2c.OctetString('my-context'), # Context Name
EchoMibInstrumController() # Management Instrumentation
)
# Register GET&SET Applications at the SNMP engine for a custom SNMP context
cmdrsp.GetCommandResponder(snmpEngine, snmpContext)
cmdrsp.SetCommandResponder(snmpEngine, snmpContext)
# Register an imaginary never-ending job to keep I/O dispatcher running forever
snmpEngine.transportDispatcher.jobStarted(1)
# Run I/O dispatcher which would receive queries and send responses
try:
snmpEngine.transportDispatcher.runDispatcher()
except:
snmpEngine.transportDispatcher.closeDispatcher()
raise
|
