我正在尝试编写一个python SNMP代理，我可以将其嵌入到我的python应用程序中，以便OpenNMS可以远程监视应用程序。 OpenNMS希望代理实现HOST-RESOURCES-MIB查询两个字段hrSWRunName和hrSWRunStatus。
我把一个pysnmp示例作为我的代码的基础，并在我认为必要时对其进行了编辑。结果代码如下所示：
import logging
from pysnmp import debug
from pysnmp.carrier.asyncore.dgram import udp
from pysnmp.entity import engine, config
from pysnmp.entity.rfc3413 import cmdrsp, context
from pysnmp.proto.api import v2c
from pysnmp.smi import builder, instrum, exval
# debug.setLogger(debug.Debug('all'))
formatting = '[%(asctime)s-%(levelname)s]-(%(module)s) %(message)s'
logging.basicConfig(level=logging.DEBUG, format=formatting, )
logging.info("Starting....")
# Create SNMP engine
snmpEngine = engine.SnmpEngine()
# Transport setup
# UDP over IPv4
config.addTransport(
snmpEngine,
udp.domainName,
udp.UdpTransport().openServerMode(('localhost', 12345))
)
# SNMPv2c setup
# SecurityName <-> CommunityName mapping.
config.addV1System(snmpEngine, 'my-area', 'public')
# Allow read MIB access for this user / securityModels at VACM
config.addVacmUser(snmpEngine,
2,
'my-area',
'noAuthNoPriv',
(1, 3, 6, 1, 2, 1),
(1, 3, 6, 1, 2, 1))
# Create an SNMP context
snmpContext = context.SnmpContext(snmpEngine)
logging.debug('Loading HOST-RESOURCES-MIB module...'),
mibBuilder = builder.MibBuilder().loadModules('HOST-RESOURCES-MIB')
logging.debug('done')
logging.debug('Building MIB tree...'),
mibInstrum = instrum.MibInstrumController(mibBuilder)
logging.debug('done')
logging.debug('Building table entry index from human-friendly representation...')
# see http://www.oidview.com/mibs/0/HOST-RESOURCES-MIB.html
hostRunTable, = mibBuilder.importSymbols('HOST-RESOURCES-MIB', 'hrSWRunEntry')
instanceId = hostRunTable.getInstIdFromIndices(1)
logging.debug('done')
# The following shows the OID name mapping
#
# hrSWRunTable 1.3.6.1.2.1.25.4.2 <TABLE>
# hrSWRunEntry 1.3.6.1.2.1.25.4.2.1 <SEQUENCE>
# hrSWRunIndex 1.3.6.1.2.1.25.4.2.1.1 <Integer32>
# hrSWRunName 1.3.6.1.2.1.25.4.2.1.2 <InternationalDisplayString> 64 Char
# hrSWRunID 1.3.6.1.2.1.25.4.2.1.3 <ProductID>
# hrSWRunPath 1.3.6.1.2.1.25.4.2.1.4 <InternationalDisplayString> 128 octets
# hrSWRunParameters 1.3.6.1.2.1.25.4.2.1.5 <InternationalDisplayString> 128 octets
# hrSWRunType 1.3.6.1.2.1.25.4.2.1.6 <INTEGER>
# hrSWRunStatus 1.3.6.1.2.1.25.4.2.1.7 <INTEGER> <<===== This is the key variable used by Opennms
# http://docs.opennms.org/opennms/releases/18.0.1/guide-admin/guide-admin.html#_hostresourceswrunmonitor)
logging.debug('Create/update HOST-RESOURCES-MIB::hrSWRunTable table row:')
varBinds = mibInstrum.writeVars((
(hostRunTable.name + (1,) + instanceId, 1),
(hostRunTable.name + (2,) + instanceId, 'AppName'), # <=== Must match OpenNMS service-name variable
(hostRunTable.name + (3,) + instanceId, {0,0}), #
(hostRunTable.name + (4,) + instanceId, 'All is well'),
(hostRunTable.name + (5,) + instanceId, 'If this was not the case it would say so here'),
(hostRunTable.name + (6,) + instanceId, 4),# Values are ==> unknown(1), operatingSystem(2), deviceDriver(3), application(4)
(hostRunTable.name + (7,) + instanceId, 1) #<<=== This is the status number OpenNMS looks at Values are ==> running(1), runnable(2), notRunnable(3), invalid(4)
))
for oid, val in varBinds:
print('%s = %s' % ('.'.join([str(x) for x in oid]), val.prettyPrint()))
logging.debug('done')
logging.debug('Read whole MIB (table walk)')
oid, val = (), None
while True:
oid, val = mibInstrum.readNextVars(((oid, val),))[0]
if exval.endOfMib.isSameTypeWith(val):
break
print('%s = %s' % ('.'.join([str(x) for x in oid]), val.prettyPrint()))
logging.debug('done')
# logging.debug('Unloading MIB modules...'),
# mibBuilder.unloadModules()
# logging.debug('done')
# --- end of table population ---
# 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.transportDispatcher.closeDispatcher()
raise
代码运行时不会产生错误。 varBinds和MIB Table walk显示了我认为我应该期待的内容：
[2016-12-29 16:42:49,323-INFO]-(SNMPAgent) Starting....
[2016-12-29 16:42:49,470-DEBUG]-(SNMPAgent) Loading HOST-RESOURCES-MIB module...
[2016-12-29 16:42:49,631-DEBUG]-(SNMPAgent) done
[2016-12-29 16:42:49,631-DEBUG]-(SNMPAgent) Building MIB tree...
[2016-12-29 16:42:49,631-DEBUG]-(SNMPAgent) done
[2016-12-29 16:42:49,631-DEBUG]-(SNMPAgent) Building table entry index from human-friendly representation...
[2016-12-29 16:42:49,631-DEBUG]-(SNMPAgent) done
[2016-12-29 16:42:49,632-DEBUG]-(SNMPAgent) Create/update HOST-RESOURCES-MIB::hrSWRunTable table row:
1.3.6.1.2.1.25.4.2.1.1.1 = 1
[2016-12-29 16:42:49,651-DEBUG]-(SNMPAgent) done
1.3.6.1.2.1.25.4.2.1.2.1 = TradeLoader
1.3.6.1.2.1.25.4.2.1.3.1 = 0
1.3.6.1.2.1.25.4.2.1.4.1 = All is well
1.3.6.1.2.1.25.4.2.1.5.1 = If this was not the case it would say so here
1.3.6.1.2.1.25.4.2.1.6.1 = 'application'
1.3.6.1.2.1.25.4.2.1.7.1 = 'running'
[2016-12-29 16:42:49,651-DEBUG]-(SNMPAgent) Read whole MIB (table walk)
1.3.6.1.2.1.25.4.2.1.1.1 = 1
1.3.6.1.2.1.25.4.2.1.2.1 = TradeLoader
1.3.6.1.2.1.25.4.2.1.3.1 = 0
1.3.6.1.2.1.25.4.2.1.4.1 = All is well
1.3.6.1.2.1.25.4.2.1.5.1 = If this was not the case it would say so here
1.3.6.1.2.1.25.4.2.1.6.1 = 'application'
1.3.6.1.2.1.25.4.2.1.7.1 = 'running'
1.3.6.1.2.1.25.5.1.1.1.1 = <no value>
1.3.6.1.2.1.25.5.1.1.2.1 = <no value>
[2016-12-29 16:42:53,490-DEBUG]-(SNMPAgent) done
最后，调度员已启动。
问题是当我尝试查询代理时没有任何反应。我没有回应。我查看了我的代码，其中一个显而易见的事实是我没有明确地将snmpEngine链接到我创建的MIB。我应该这样做吗？
我很难理解任何见解，因为我正在努力了解目前的去向。
答案 0 :(得分：2)
我以为我会回答我的问题，因为我花了这么长时间才弄清楚如何做我需要的事情。希望其他人会觉得这很有用。以下代码允许我填充pysnmp已知的任何MIB，然后将MIB作为V2 SNMP代理提供给网络。
import logging
from pysnmp import debug
from pysnmp.carrier.asyncore.dgram import udp
from pysnmp.entity import engine, config
from pysnmp.entity.rfc3413 import cmdrsp, context
from pysnmp.proto.api import v2c
from pysnmp.smi import builder, instrum, exval
# Uncomment this to turn pysnmp debugging on
#debug.setLogger(debug.Debug('all'))
formatting = '[%(asctime)s-%(levelname)s]-(%(module)s) %(message)s'
logging.basicConfig(level=logging.DEBUG, format=formatting, )
logging.info("Starting....")
# Create SNMP engine
snmpEngine = engine.SnmpEngine()
# Transport setup
# UDP over IPv4
config.addTransport(
snmpEngine,
udp.domainName,
udp.UdpTransport().openServerMode(('0.0.0.0', 12345))
)
# SNMPv2c setup
# SecurityName <-> CommunityName mapping.
config.addV1System(snmpEngine, 'my-area', 'public')
# Allow read MIB access for this user / securityModels at VACM
# Limit access to just the custom MIB. Widen if need be
config.addVacmUser(snmpEngine,
2,
'my-area',
'noAuthNoPriv',
(1, 3, 6, 1, 2, 1, 25, 4),
(1, 3, 6, 1, 2, 1, 25, 4))
# Create an SNMP context and ensure the custom MIB is loaded
# Your system must have this MIB installed otherwise pysnmp
# can't load it!
snmpContext = context.SnmpContext(snmpEngine)
logging.debug('Loading HOST-RESOURCES-MIB module...'),
mibBuilder = snmpContext.getMibInstrum().getMibBuilder()
mibBuilder.loadModules('HOST-RESOURCES-MIB')
mibInstrum = snmpContext.getMibInstrum()
logging.debug('done')
logging.debug('Building table entry index from human-friendly representation...')
# see http://www.oidview.com/mibs/0/HOST-RESOURCES-MIB.html
hostRunTable, = mibBuilder.importSymbols('HOST-RESOURCES-MIB', 'hrSWRunEntry')
instanceId = hostRunTable.getInstIdFromIndices(1)
logging.debug('done')
# The following shows the OID name mapping
#
# hrSWRunTable 1.3.6.1.2.1.25.4.2 <TABLE>
# hrSWRunEntry 1.3.6.1.2.1.25.4.2.1 <SEQUENCE>
# hrSWRunIndex 1.3.6.1.2.1.25.4.2.1.1 <Integer32>
# hrSWRunName 1.3.6.1.2.1.25.4.2.1.2 <InternationalDisplayString> 64 Char
# hrSWRunID 1.3.6.1.2.1.25.4.2.1.3 <ProductID>
# hrSWRunPath 1.3.6.1.2.1.25.4.2.1.4 <InternationalDisplayString> 128 octets
# hrSWRunParameters 1.3.6.1.2.1.25.4.2.1.5 <InternationalDisplayString> 128 octets
# hrSWRunType 1.3.6.1.2.1.25.4.2.1.6 <INTEGER>
# hrSWRunStatus 1.3.6.1.2.1.25.4.2.1.7 <INTEGER> <<===== This is the key variable used by Opennms
# We are going to use OpenNMS as the SNMP manager. OpenNMS will poll this agent to check on its status. The manual
# states:
#
# "This monitor tests the running state of one or more processes. It does this using SNMP and by inspecting the
# hrSwRunTable of the HOST-RESOURCES-MIB. The test is done by matching a given process as hrSWRunName against
# the numeric value of the hrSWRunStatus". hrSWRunName is matched against the process name defined in the OpenNMS
# config file under the heading "service-name". hrSWRunStatus is set to whatever your desired status is. OpenNMS
# will compare this value against the config file variable run-level. If hrSWRunStatus > run-level the process
# will be marked as having problems. for the complete page see:
# http://docs.opennms.org/opennms/releases/18.0.1/guide-admin/guide-admin.html#_hostresourceswrunmonitor)
# I have made up an enterprise MIB for us. The number is moot as it's not going to go anywhere but the code needs
# something valid.
# The enterprise MIB I have chosen is
enterpriseMib = (1, 3, 6, 1, 4, 1, 50000, 0)
logging.debug('Create/update HOST-RESOURCES-MIB::hrSWRunTable table row:')
varBinds = mibInstrum.writeVars((
(hostRunTable.name + (1,) + instanceId, 1),
(hostRunTable.name + (2,) + instanceId, 'TradeLoader'), # <=== Must match OpenNMS service-name variable
(hostRunTable.name + (3,) + instanceId, enterpriseMib), #
(hostRunTable.name + (4,) + instanceId, 'All is well'),
(hostRunTable.name + (5,) + instanceId, 'If this was not the case it would say so here'),
(hostRunTable.name + (6,) + instanceId, 4),# Values are ==> unknown(1), operatingSystem(2), deviceDriver(3), application(4)
(hostRunTable.name + (7,) + instanceId, 1) #<<=== This is the status number OpenNMS looks at Values are ==> running(1), runnable(2), notRunnable(3), invalid(4)
))
# --- end of table population ---
logging.debug('Confirm that the data has been set by reading whole MIB (table walk)')
oid, val = (), None
while True:
oid, val = mibInstrum.readNextVars(((oid, val),))[0]
if exval.endOfMib.isSameTypeWith(val):
break
print('%s = %s' % ('.'.join([str(x) for x in oid]), val.prettyPrint()))
logging.debug('done')
# 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.transportDispatcher.closeDispatcher()
raise
记录器消息显示
[2017-01-09 16:30:15,401-INFO]-(SNMPAgent) Starting.... [2017-01-09 16:30:15,490-DEBUG]-(SNMPAgent) Loading HOST-RESOURCES-MIB module... [2017-01-09 16:30:15,513-DEBUG]-(SNMPAgent) done [2017-01-09 16:30:15,513-DEBUG]-(SNMPAgent) Building table entry index from human-friendly representation... [2017-01-09 16:30:15,515-DEBUG]-(SNMPAgent) done [2017-01-09 16:30:15,515-DEBUG]-(SNMPAgent) Create/update HOST-RESOURCES-MIB::hrSWRunTable table row: [2017-01-09 16:30:15,536-DEBUG]-(SNMPAgent) Confirm that the data has been set by reading whole MIB (table walk)
1.3.6.1.2.1.25.4.2.1.1.1 = 1
1.3.6.1.2.1.25.4.2.1.2.1 = TradeLoader
1.3.6.1.2.1.25.4.2.1.3.1 = 1.3.6.1.4.1.50000.0
1.3.6.1.2.1.25.4.2.1.4.1 = All is well
1.3.6.1.2.1.25.4.2.1.5.1 = If this was not the case it would say so here
1.3.6.1.2.1.25.4.2.1.6.1 = 'application'
1.3.6.1.2.1.25.4.2.1.7.1 = 'running'
1.3.6.1.2.1.25.5.1.1.1.1 = <no value>
1.3.6.1.2.1.25.5.1.1.2.1 = <no value>
1.3.6.1.6.3.10.2.1.1.0 = 0x80004fb805049c06c8
1.3.6.1.6.3.10.2.1.2.0 = 2
1.3.6.1.6.3.10.2.1.3.0 = 0
1.3.6.1.6.3.10.2.1.4.0 = 65507
1.3.6.1.6.3.16.1.1.1.1.0 =
1.3.6.1.6.3.16.1.2.1.1.2.7.109.121.45.97.114.101.97 = 2
1.3.6.1.6.3.16.1.2.1.2.2.7.109.121.45.97.114.101.97 = my-area
1.3.6.1.6.3.16.1.2.1.3.2.7.109.121.45.97.114.101.97 = v-1203634843-2
1.3.6.1.6.3.16.1.2.1.4.2.7.109.121.45.97.114.101.97 = 'nonVolatile'
1.3.6.1.6.3.16.1.2.1.5.2.7.109.121.45.97.114.101.97 = 'active'
1.3.6.1.6.3.16.1.4.1.1.14.118.45.49.50.48.51.54.51.52.56.52.51.45.50.0.2.1 =
1.3.6.1.6.3.16.1.4.1.2.14.118.45.49.50.48.51.54.51.52.56.52.51.45.50.0.2.1 = 2
1.3.6.1.6.3.16.1.4.1.3.14.118.45.49.50.48.51.54.51.52.56.52.51.45.50.0.2.1 = 'noAuthNoPriv'
1.3.6.1.6.3.16.1.4.1.4.14.118.45.49.50.48.51.54.51.52.56.52.51.45.50.0.2.1 = 'exact'
1.3.6.1.6.3.16.1.4.1.5.14.118.45.49.50.48.51.54.51.52.56.52.51.45.50.0.2.1 = rv-1203634843-2
1.3.6.1.6.3.16.1.4.1.6.14.118.45.49.50.48.51.54.51.52.56.52.51.45.50.0.2.1 = wv-1203634843-2
1.3.6.1.6.3.16.1.4.1.7.14.118.45.49.50.48.51.54.51.52.56.52.51.45.50.0.2.1 = nv-1203634843-2
1.3.6.1.6.3.16.1.4.1.8.14.118.45.49.50.48.51.54.51.52.56.52.51.45.50.0.2.1 = 'nonVolatile'
1.3.6.1.6.3.16.1.4.1.9.14.118.45.49.50.48.51.54.51.52.56.52.51.45.50.0.2.1 = 'active'
1.3.6.1.6.3.16.1.5.2.1.1.15.114.118.45.49.50.48.51.54.51.52.56.52.51.45.50.11.1.3.6.1.2.1.25.4
= rv-1203634843-2
1.3.6.1.6.3.16.1.5.2.1.1.15.119.118.45.49.50.48.51.54.51.52.56.52.51.45.50.11.1.3.6.1.2.1.25.4
= wv-1203634843-2
1.3.6.1.6.3.16.1.5.2.1.2.15.114.118.45.49.50.48.51.54.51.52.56.52.51.45.50.11.1.3.6.1.2.1.25.4
= 1.3.6.1.2.1.25.4
1.3.6.1.6.3.16.1.5.2.1.2.15.119.118.45.49.50.48.51.54.51.52.56.52.51.45.50.11.1.3.6.1.2.1.25.4
= 1.3.6.1.2.1.25.4
1.3.6.1.6.3.16.1.5.2.1.3.15.114.118.45.49.50.48.51.54.51.52.56.52.51.45.50.11.1.3.6.1.2.1.25.4
=
1.3.6.1.6.3.16.1.5.2.1.3.15.119.118.45.49.50.48.51.54.51.52.56.52.51.45.50.11.1.3.6.1.2.1.25.4
=
1.3.6.1.6.3.16.1.5.2.1.4.15.114.118.45.49.50.48.51.54.51.52.56.52.51.45.50.11.1.3.6.1.2.1.25.4
= 'included'
1.3.6.1.6.3.16.1.5.2.1.4.15.119.118.45.49.50.48.51.54.51.52.56.52.51.45.50.11.1.3.6.1.2.1.25.4
= 'included'
1.3.6.1.6.3.16.1.5.2.1.5.15.114.118.45.49.50.48.51.54.51.52.56.52.51.45.50.11.1.3.6.1.2.1.25.4
= 'nonVolatile'
1.3.6.1.6.3.16.1.5.2.1.5.15.119.118.45.49.50.48.51.54.51.52.56.52.51.45.50.11.1.3.6.1.2.1.25.4
= 'nonVolatile'
1.3.6.1.6.3.16.1.5.2.1.6.15.114.118.45.49.50.48.51.54.51.52.56.52.51.45.50.11.1.3.6.1.2.1.25.4
= 'active'
1.3.6.1.6.3.16.1.5.2.1.6.15.119.118.45.49.50.48.51.54.51.52.56.52.51.45.50.11.1.3.6.1.2.1.25.4
= 'active'
1.3.6.1.6.3.18.1.1.1.1.109.121.45.97.114.101.97 = my-area
1.3.6.1.6.3.18.1.1.1.2.109.121.45.97.114.101.97 = public
1.3.6.1.6.3.18.1.1.1.3.109.121.45.97.114.101.97 = my-area
1.3.6.1.6.3.18.1.1.1.4.109.121.45.97.114.101.97 = 0x80004fb805049c06c8
1.3.6.1.6.3.18.1.1.1.5.109.121.45.97.114.101.97 =
1.3.6.1.6.3.18.1.1.1.6.109.121.45.97.114.101.97 =
1.3.6.1.6.3.18.1.1.1.7.109.121.45.97.114.101.97 = 'nonVolatile'
1.3.6.1.6.3.18.1.1.1.8.109.121.45.97.114.101.97 = 'active' [2017-01-09 16:30:15,683-DEBUG]-(SNMPAgent) done
可以查询代理以显示如下结果：
snmpwalk -v 2c -c public -n my-context 0.0.0.0:12345 1.3.6
HOST-RESOURCES-MIB::hrSWRunIndex.1 = INTEGER: 1
HOST-RESOURCES-MIB::hrSWRunName.1 = STRING: "TradeLoader"
HOST-RESOURCES-MIB::hrSWRunID.1 = OID: SNMPv2-SMI::enterprises.50000.0
HOST-RESOURCES-MIB::hrSWRunPath.1 = STRING: "All is well"
HOST-RESOURCES-MIB::hrSWRunParameters.1 = STRING: "If this was not the case it would say so here"
HOST-RESOURCES-MIB::hrSWRunType.1 = INTEGER: application(4)
HOST-RESOURCES-MIB::hrSWRunStatus.1 = INTEGER: running(1)
HOST-RESOURCES-MIB::hrSWRunStatus.1 = No more variables left in this MIB View (It is past the end of the MIB tree)
答案 1 :(得分：1)
你说
问题是当我尝试查询代理时没有任何反应。我没有回复
看起来有两个问题：
a）localhost解析为我系统上的环回地址127.0.0.1，因此您只能从与代理相同的系统访问它。
b）您在addVacmUser中注册为SNMP版本2，因此您无法使用V1
进行访问之后：
% snmpwalk -v 2c -c public 127.0.0.1:12345
SNMPv2-MIB::sysDescr.0 = STRING: PySNMP engine version 4.3.2, Python 2.7.5 (default, Nov 3 2014, 14:33:39) [GCC 4.8.3 20140911 (Red Hat 4.8.3-7)]
SNMPv2-MIB::sysObjectID.0 = OID: SNMPv2-SMI::enterprises.20408
DISMAN-EVENT-MIB::sysUpTimeInstance = Timeticks: (1) 0:00:00.01
SNMPv2-MIB::sysContact.0 = STRING:
...
虽然没有HOST-RESOURCE-MIB对象。这是另一个问题。