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
78
79
80
81
82
83
84
85
86
87
88
89
90
|
"""
Observe SNMP engine operations
++++++++++++++++++++++++++++++
Listen and respond to SNMP GET/SET/GETNEXT/GETBULK queries with
the following options:
* SNMPv3
* with USM user 'usr-md5-des', auth: MD5, priv DES or
* allow access to SNMPv2-MIB objects (1.3.6.1.2.1)
* over IPv4/UDP, listening at 127.0.0.1:161
* registers its own execution observer to snmpEngine
The following Net-SNMP command will walk this Agent:
| $ snmpwalk -v3 -u usr-md5-des -l authPriv -A authkey1 -X privkey1 localhost .1.3.6
This script will report some details on request processing as seen
by rfc3412.receiveMessage() and rfc3412.returnResponsePdu()
abstract interfaces.
"""#
from pysnmp.entity import engine, config
from pysnmp.entity.rfc3413 import cmdrsp, context
from pysnmp.carrier.asyncore.dgram import udp
# Create SNMP engine
snmpEngine = engine.SnmpEngine()
# Execution point observer setup
# Register a callback to be invoked at specified execution point of
# SNMP Engine and passed local variables at code point's local scope
def requestObserver(snmpEngine, execpoint, variables, cbCtx):
print('Execution point: %s' % execpoint)
print('* transportDomain: %s' % '.'.join([str(x) for x in variables['transportDomain']]))
print('* transportAddress: %s (local %s)' % ('@'.join([str(x) for x in variables['transportAddress']]), '@'.join([str(x) for x in variables['transportAddress'].getLocalAddress()])))
print('* securityModel: %s' % variables['securityModel'])
print('* securityName: %s' % variables['securityName'])
print('* securityLevel: %s' % variables['securityLevel'])
print('* contextEngineId: %s' % variables['contextEngineId'].prettyPrint())
print('* contextName: %s' % variables['contextName'].prettyPrint())
print('* PDU: %s' % variables['pdu'].prettyPrint())
snmpEngine.observer.registerObserver(
requestObserver,
'rfc3412.receiveMessage:request',
'rfc3412.returnResponsePdu'
)
# Transport setup
# UDP over IPv4
config.addTransport(
snmpEngine,
udp.domainName,
udp.UdpTransport().openServerMode(('127.0.0.1', 161))
)
# SNMPv3/USM setup
# user: usr-md5-des, auth: MD5, priv DES
config.addV3User(
snmpEngine, 'usr-md5-des',
config.usmHMACMD5AuthProtocol, 'authkey1',
config.usmDESPrivProtocol, 'privkey1'
)
# Allow full MIB access for each user at VACM
config.addVacmUser(snmpEngine, 3, 'usr-md5-des', 'authPriv', (1,3,6,1,2,1), (1,3,6,1,2,1))
# Get default SNMP context this SNMP engine serves
snmpContext = context.SnmpContext(snmpEngine)
# Register SNMP Applications at the SNMP engine for particular SNMP context
cmdrsp.GetCommandResponder(snmpEngine, snmpContext)
cmdrsp.SetCommandResponder(snmpEngine, snmpContext)
cmdrsp.NextCommandResponder(snmpEngine, snmpContext)
cmdrsp.BulkCommandResponder(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.observer.unregisterObserver()
snmpEngine.transportDispatcher.closeDispatcher()
raise
|
