/usr/bin/snmpsimd is in snmpsim 0.2.4-1.
This file is owned by root:root, with mode 0o755.
The actual contents of the file can be viewed below.
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#
# SNMP Agent Simulator
#
# Written by Ilya Etingof <ilya@glas.net>, 2010-2013
#
import os
import stat
import sys
import getopt
import traceback
if sys.version_info[0] < 3 and sys.version_info[1] < 5:
from md5 import md5
else:
from hashlib import md5
from pyasn1.type import univ
from pyasn1.codec.ber import encoder, decoder
from pyasn1.compat.octets import str2octs
from pyasn1.error import PyAsn1Error
from pysnmp.entity import engine, config
from pysnmp.entity.rfc3413 import cmdrsp, context
from pysnmp.carrier.asynsock.dgram import udp
try:
from pysnmp.carrier.asynsock.dgram import udp6
except ImportError:
udp6 = None
try:
from pysnmp.carrier.asynsock.dgram import unix
except ImportError:
unix = None
from pysnmp.carrier.asynsock.dispatch import AsynsockDispatcher
from pysnmp.smi import exval, indices
from pysnmp.smi.error import MibOperationError
from pysnmp.proto import rfc1902, rfc1905, api
from pysnmp import error
from pysnmp import debug
from snmpsim.error import SnmpsimError, NoDataNotification
from snmpsim import confdir, log, daemon
from snmpsim.record import dump, mvc, sap, walk, snmprec
from snmpsim.record.search.file import searchRecordByOid
from snmpsim.record.search.database import RecordIndex
# Settings
forceIndexBuild = False
validateData = False
transportIdOffset= 0
v2cArch = False
v3Only = False
pidFile = '/var/run/snmpsim/snmpsimd.pid'
foregroundFlag = True
procUser = procGroup = None
variationModulesOptions = {}
variationModules = {}
authProtocols = {
'MD5': config.usmHMACMD5AuthProtocol,
'SHA': config.usmHMACSHAAuthProtocol,
'NONE': config.usmNoAuthProtocol
}
privProtocols = {
'DES': config.usmDESPrivProtocol,
'3DES': config.usm3DESEDEPrivProtocol,
'AES': config.usmAesCfb128Protocol,
'AES128': config.usmAesCfb128Protocol,
'AES192': config.usmAesCfb192Protocol,
'AES256': config.usmAesCfb256Protocol,
'NONE': config.usmNoPrivProtocol
}
# Transport endpoints collection
class TransportEndpointsBase:
def __init__(self):
self.__endpoint = None
def add(self, addr):
self.__endpoint = self._addEndpoint(addr)
return self
def _addEndpoint(self, addr): raise NotImplementedError()
def __len__(self): return len(self.__endpoint)
def __getitem__(self, i): return self.__endpoint[i]
class IPv4TransportEndpoints(TransportEndpointsBase):
def _addEndpoint(self, addr):
f = lambda h,p=161: (h, int(p))
try:
h, p = f(*addr.split(':'))
except:
raise SnmpsimError('improper IPv4/UDP endpoint %s' % addr)
return udp.UdpTransport().openServerMode((h, p)), addr
class IPv6TransportEndpoints(TransportEndpointsBase):
def _addEndpoint(self, addr):
if not udp6:
raise SnmpsimError('This system does not support UDP/IP6')
if addr.find(']:') != -1 and addr[0] == '[':
h, p = addr.split(']:')
try:
h, p = h[1:], int(p)
except:
raise SnmpsimError('improper IPv6/UDP endpoint %s' % addr)
elif addr[0] == '[' and addr[-1] == ']':
h, p = addr[1:-1], 161
else:
h, p = addr, 161
return udp6.Udp6Transport().openServerMode((h, p)), addr
class UnixTransportEndpoints(TransportEndpointsBase):
def _addEndpoint(self, addr):
if not unix:
raise SnmpsimError('This system does not support UNIX domain sockets')
return unix.UnixTransport().openServerMode(addr), addr
# Extended snmprec record handler
class SnmprecRecord(snmprec.SnmprecRecord):
def evaluateValue(self, oid, tag, value, **context):
# Variation module reference
if ':' in tag:
modName, tag = tag[tag.index(':')+1:], tag[:tag.index(':')]
else:
modName = None
if modName:
if 'variationModules' in context and \
modName in context['variationModules']:
if 'dataValidation' in context:
return oid, tag, univ.Null
else:
if context['setFlag']:
hexvalue = self.grammar.hexifyValue(context['origValue'])
if hexvalue is not None:
context['hexvalue'] = hexvalue
context['hextag'] = self.grammar.getTagByType(context['origValue']) + 'x'
# prepare agent and record contexts on first reference
( variationModule,
agentContexts,
recordContexts ) = context['variationModules'][modName]
if context['dataFile'] not in agentContexts:
agentContexts[context['dataFile']] = {}
variationModule['agentContext'] = agentContexts[context['dataFile']]
if oid not in recordContexts:
recordContexts[oid] = {}
variationModule['recordContext'] = recordContexts[oid]
# invoke variation module
oid, tag, value = variationModule['variate'](oid, tag, value, **context)
else:
raise SnmpsimError('Variation module "%s" referenced but not loaded\r\n' % modName)
if not modName:
if 'dataValidation' in context:
snmprec.SnmprecRecord.evaluateValue(
self, oid, tag, value, **context
)
if not context['nextFlag'] and not context['exactMatch'] or \
context['setFlag']:
return context['origOid'], tag, context['errorStatus']
if not hasattr(value, 'tagSet'): # not already a pyasn1 object
return snmprec.SnmprecRecord.evaluateValue(
self, oid, tag, value, **context
)
return oid, tag, value
def evaluate(self, line, **context):
oid, tag, value = self.grammar.parse(line)
oid = self.evaluateOid(oid)
if context.get('oidOnly'):
value = None
else:
try:
oid, tag, value = self.evaluateValue(oid, tag, value, **context)
except NoDataNotification:
raise
except MibOperationError:
raise
except PyAsn1Error:
raise SnmpsimError('value evaluation for %s = %r failed: %s\r\n' % (oid, value, sys.exc_info()[1]))
return oid, value
recordSet = {
dump.DumpRecord.ext: dump.DumpRecord(),
mvc.MvcRecord.ext: mvc.MvcRecord(),
sap.SapRecord.ext: sap.SapRecord(),
walk.WalkRecord.ext: walk.WalkRecord(),
SnmprecRecord.ext: SnmprecRecord()
}
class AbstractLayout:
layout = '?'
# Data text file and OID index
class DataFile(AbstractLayout):
layout = 'text'
openedQueue = []
maxQueueEntries = 31 # max number of open text and index files
def __init__(self, textFile, textParser):
self.__recordIndex = RecordIndex(textFile, textParser)
self.__textParser = textParser
self.__textFile = textFile
def indexText(self, forceIndexBuild=False):
self.__recordIndex.create(forceIndexBuild, validateData)
return self
def close(self):
self.__recordIndex.close()
def getHandles(self):
if not self.__recordIndex.isOpen():
if len(DataFile.openedQueue) > self.maxQueueEntries:
log.msg('Closing %s' % self)
DataFile.openedQueue[0].close()
del DataFile.openedQueue[0]
DataFile.openedQueue.append(self)
log.msg('Opening %s' % self)
return self.__recordIndex.getHandles()
def processVarBinds(self, varBinds, **context):
rspVarBinds = []
if context.get('nextFlag'):
errorStatus = exval.endOfMib
else:
errorStatus = exval.noSuchInstance
try:
text, db = self.getHandles()
except SnmpsimError:
log.msg('Problem with data file or its index: %s' % sys.exc_info()[1])
return [ (vb[0],errorStatus) for vb in varBinds ]
varsRemaining = varsTotal = len(varBinds)
log.msg('Request var-binds: %s, flags: %s, %s' % (', '.join(['%s=<%s>' % (vb[0], vb[1].prettyPrint()) for vb in varBinds]), context.get('nextFlag') and 'NEXT' or 'EXACT', context.get('setFlag') and 'SET' or 'GET'))
for oid, val in varBinds:
textOid = str(
univ.OctetString('.'.join([ '%s' % x for x in oid ]))
)
try:
line = self.__recordIndex.lookup(
str(univ.OctetString('.'.join([ '%s' % x for x in oid ])))
)
except KeyError:
offset = searchRecordByOid(oid, text, self.__textParser)
subtreeFlag = exactMatch = False
else:
offset, subtreeFlag, prevOffset = line.split(str2octs(','))
subtreeFlag, exactMatch = int(subtreeFlag), True
offset = int(offset)
text.seek(offset)
varsRemaining -= 1
line = text.readline() # matched line
while True:
if exactMatch:
if context.get('nextFlag') and not subtreeFlag:
_nextLine = text.readline() # next line
if _nextLine:
_nextOid, _ = self.__textParser.evaluate(_nextLine, oidOnly=True)
try:
_, subtreeFlag, _ = self.__recordIndex.lookup(str(_nextOid)).split(str2octs(','))
except KeyError:
log.msg('data error for %s at %s, index broken?' % (self, _nextOid))
line = '' # fatal error
else:
subtreeFlag = int(subtreeFlag)
line = _nextLine
else:
line = _nextLine
else: # search function above always rounds up to the next OID
if line:
_oid, _ = self.__textParser.evaluate(
line, oidOnly=True
)
else: # eom
_oid = 'last'
try:
_, _, _prevOffset = self.__recordIndex.lookup(str(_oid)).split(str2octs(','))
except KeyError:
log.msg('data error for %s at %s, index broken?' % (self, _oid))
line = '' # fatal error
else:
_prevOffset = int(_prevOffset)
# previous line serves a subtree?
if _prevOffset >= 0:
text.seek(_prevOffset)
_prevLine = text.readline()
_prevOid, _ = self.__textParser.evaluate(
_prevLine, oidOnly=True
)
if _prevOid.isPrefixOf(oid):
# use previous line to the matched one
line = _prevLine
subtreeFlag = True
if not line:
_oid = oid
_val = errorStatus
break
callContext = context.copy()
callContext.update((),
origOid=oid,
origValue=val,
dataFile=self.__textFile,
subtreeFlag=subtreeFlag,
exactMatch=exactMatch,
errorStatus=errorStatus,
varsTotal=varsTotal,
varsRemaining=varsRemaining,
variationModules=variationModules
)
try:
_oid, _val = self.__textParser.evaluate(line, **callContext)
if _val is exval.endOfMib:
exactMatch = True
subtreeFlag = False
continue
except NoDataNotification:
raise
except MibOperationError:
raise
except Exception:
_oid = oid
_val = errorStatus
log.msg('data error at %s for %s: %s' % (self, textOid, sys.exc_info()[1]))
break
rspVarBinds.append((_oid, _val))
log.msg('Response var-binds: %s' % (', '.join(['%s=<%s>' % (vb[0], vb[1].prettyPrint()) for vb in rspVarBinds])))
return rspVarBinds
def __str__(self): return '%s controller' % self.__textFile
# Collect data files
def getDataFiles(tgtDir, topLen=None):
if topLen is None:
topLen = len(tgtDir.split(os.path.sep))
dirContent = []
for dFile in os.listdir(tgtDir):
fullPath = tgtDir + os.path.sep + dFile
inode = os.lstat(fullPath)
if stat.S_ISLNK(inode.st_mode):
relPath = fullPath.split(os.path.sep)[topLen:]
fullPath = os.readlink(fullPath)
if not os.path.isabs(fullPath):
fullPath = tgtDir + os.path.sep + fullPath
inode = os.stat(fullPath)
else:
relPath = fullPath.split(os.path.sep)[topLen:]
if stat.S_ISDIR(inode.st_mode):
dirContent = dirContent + getDataFiles(fullPath, topLen)
continue
if not stat.S_ISREG(inode.st_mode):
continue
dExt = os.path.splitext(dFile)[1][1:]
if dExt not in recordSet:
continue
dirContent.append(
(fullPath,
recordSet[dExt],
os.path.splitext(os.path.join(*relPath))[0].replace(os.path.sep, '/'))
)
return dirContent
# Lightweignt MIB instrumentation (API-compatible with pysnmp's)
class MibInstrumController:
def __init__(self, dataFile):
self.__dataFile = dataFile
def __str__(self): return str(self.__dataFile)
def __getCallContext(self, acInfo, nextFlag=False, setFlag=False):
if acInfo is None:
return { 'nextFlag': nextFlag,
'setFlag': setFlag }
acFun, acCtx = acInfo
( snmpEngine,
securityModel,
securityName,
securityLevel,
contextName,
pduType ) = acCtx # this is not [yet] documented
log.msg('SNMP EngineID %s, securityModel %s, securityName %s, securityLevel %s' % (hasattr(snmpEngine, 'snmpEngineID') and snmpEngine.snmpEngineID.prettyPrint() or '<unknown>', securityModel, securityName, securityLevel))
return { 'snmpEngine': snmpEngine,
'securityModel': securityModel,
'securityName': securityName,
'securityLevel': securityLevel,
'contextName': contextName,
'nextFlag': nextFlag,
'setFlag': setFlag }
def readVars(self, varBinds, acInfo=None):
return self.__dataFile.processVarBinds(
varBinds, **self.__getCallContext(acInfo, False)
)
def readNextVars(self, varBinds, acInfo=None):
return self.__dataFile.processVarBinds(
varBinds, **self.__getCallContext(acInfo, True)
)
def writeVars(self, varBinds, acInfo=None):
return self.__dataFile.processVarBinds(
varBinds, **self.__getCallContext(acInfo, False, True)
)
# Data files index as a MIB instrumentaion at a dedicated SNMP context
class DataIndexInstrumController:
indexSubOid = (1,)
def __init__(self, baseOid=(1, 3, 6, 1, 4, 1, 20408, 999)):
self.__db = indices.OidOrderedDict()
self.__indexOid = baseOid + self.indexSubOid
self.__idx = 1
def __str__(self): return '<index> controller'
def readVars(self, varBinds, acInfo=None):
return [ (vb[0], self.__db.get(vb[0], exval.noSuchInstance)) for vb in varBinds ]
def __getNextVal(self, key, default):
try:
key = self.__db.nextKey(key)
except KeyError:
return key, default
else:
return key, self.__db[key]
def readNextVars(self, varBinds, acInfo=None):
return [ self.__getNextVal(vb[0], exval.endOfMib) for vb in varBinds ]
def writeVars(self, varBinds, acInfo=None):
return [ (vb[0], exval.noSuchInstance) for vb in varBinds ]
def addDataFile(self, *args):
for idx in range(len(args)):
self.__db[
self.__indexOid + (idx+1, self.__idx)
] = rfc1902.OctetString(args[idx])
self.__idx = self.__idx + 1
mibInstrumControllerSet = {
DataFile.layout: MibInstrumController
}
# Suggest variations of context name based on request data
def probeContext(transportDomain, transportAddress, contextName):
candidate = [
contextName, '.'.join([ str(x) for x in transportDomain ])
]
if transportDomain[:len(udp.domainName)] == udp.domainName:
candidate.append(transportAddress[0])
elif udp6 and transportDomain[:len(udp6.domainName)] == udp6.domainName:
candidate.append(
str(transportAddress[0]).replace(':', '_')
)
elif unix and transportDomain[:len(unix.domainName)] == unix.domainName:
candidate.append(transportAddress)
candidate = [ str(x) for x in candidate if x ]
while candidate:
yield rfc1902.OctetString(os.path.normpath(os.path.sep.join(candidate)).replace(os.path.sep, '/')).asOctets()
del candidate[-1]
# main script body starts here
helpMessage = """\
Usage: %s [--help]
[--version ]
[--debug=<%s>]
[--daemonize]
[--process-user=<uname>] [--process-group=<gname>]
[--pid-file=<file>]
[--logging-method=<stdout|stderr|syslog|file>[:args>]]
[--cache-dir=<dir>]
[--variation-modules-dir=<dir>]
[--variation-module-options=<module[=alias][:args]>]
[--force-index-rebuild]
[--validate-data]
[--v2c-arch]
[--v3-only]
[--transport-id-offset=<number>]
[--args-from-file=<file>]
[--v3-engine-id=<hexvalue>]
[--data-dir=<dir>]
[--agent-udpv4-endpoint=<X.X.X.X:NNNNN>]
[--agent-udpv6-endpoint=<[X:X:..X]:NNNNN>]
[--agent-unix-endpoint=</path/to/named/pipe>]
[--v3-user=<username>]
[--v3-auth-key=<key>]
[--v3-auth-proto=<%s>]
[--v3-priv-key=<key>]
[--v3-priv-proto=<%s>]""" % (
sys.argv[0],
'|'.join([ x for x in debug.flagMap.keys() if x != 'mibview' ]),
'|'.join(authProtocols),
'|'.join(privProtocols)
)
try:
opts, params = getopt.getopt(sys.argv[1:], 'hv', [
'help', 'version', 'debug=', 'daemonize', 'process-user=',
'process-group=', 'pid-file=', 'logging-method=', 'device-dir=',
'cache-dir=', 'variation-modules-dir=',
'force-index-rebuild', 'validate-device-data', 'validate-data',
'v2c-arch', 'v3-only', 'transport-id-offset=',
'variation-module-options=',
'args-from-file=',
# this option starts new SNMPv3 engine configuration
'data-dir=',
'v3-engine-id=',
'agent-udpv4-endpoint=','agent-udpv6-endpoint=','agent-unix-endpoint=',
'v3-user=',
'v3-auth-key=', 'v3-auth-proto=',
'v3-priv-key=', 'v3-priv-proto='
])
except Exception:
sys.stderr.write('ERROR: %s\r\n%s\r\n' % (sys.exc_info()[1], helpMessage))
sys.exit(-1)
if params:
sys.stderr.write('ERROR: extra arguments supplied %s\r\n%s\r\n' % (params, helpMessage))
sys.exit(-1)
log.setLogger('snmpsimd', 'stderr')
v3Args = []
for opt in opts:
if opt[0] == '-h' or opt[0] == '--help':
sys.stderr.write("""\
Synopsis:
SNMP Agents Simulation tool. Responds to SNMP requests, variate responses
based on transport addresses, SNMP community name or SNMPv3 context name.
Can implement highly complex behavior through variation modules.
Documentation:
http://snmpsim.sourceforge.net/simulating-agents.html
%s
""" % helpMessage)
sys.exit(-1)
if opt[0] == '-v' or opt[0] == '--version':
import snmpsim, pysnmp, pyasn1
sys.stderr.write("""\
SNMP Simulator version %s, written by Ilya Etingof <ilya@glas.net>
Using foundation libraries: pysnmp %s, pyasn1 %s.
Python interpreter: %s
Software documentation and support at http://snmpsim.sf.net
%s
""" % (snmpsim.__version__, hasattr(pysnmp, '__version__') and pysnmp.__version__ or 'unknown', hasattr(pyasn1, '__version__') and pyasn1.__version__ or 'unknown', sys.version, helpMessage))
sys.exit(-1)
elif opt[0] == '--debug':
debug.setLogger(debug.Debug(opt[1]))
elif opt[0] == '--daemonize':
foregroundFlag = False
elif opt[0] == '--process-user':
procUser = opt[1]
elif opt[0] == '--process-group':
procGroup = opt[1]
elif opt[0] == '--pid-file':
pidFile = opt[1]
elif opt[0] == '--logging-method':
try:
log.setLogger('snmpsimd', *opt[1].split(':'))
except SnmpsimError:
sys.stderr.write('%s\r\n%s\r\n' % (sys.exc_info()[1], helpMessage))
sys.exit(-1)
elif opt[0] in ('--device-dir', '--data-dir'):
if '--v3-engine-id' in [ x[0] for x in v3Args ]:
v3Args.append(opt)
else:
confdir.data.insert(0, opt[1])
elif opt[0] == '--cache-dir':
confdir.cache = opt[1]
elif opt[0] == '--variation-modules-dir':
confdir.variation.insert(0, opt[1])
elif opt[0] == '--variation-module-options':
args = opt[1].split(':', 1)
try:
modName, args = args[0], args[1]
except:
sys.stderr.write('ERROR: improper variation module options: %s\r\n%s\r\n' % (opt[1], helpMessage))
sys.exit(-1)
if '=' in modName:
modName, alias = modName.split('=', 1)
else:
alias = os.path.splitext(os.path.basename(modName))[0]
if modName not in variationModulesOptions:
variationModulesOptions[modName] = []
variationModulesOptions[modName].append((alias, args))
elif opt[0] == '--force-index-rebuild':
forceIndexBuild = True
elif opt[0] in ('--validate-device-data', '--validate-data'):
validateData = True
elif opt[0] == '--v2c-arch':
v2cArch = True
elif opt[0] == '--v3-only':
v3Only = True
elif opt[0] == '--transport-id-offset':
try:
transportIdOffset = max(0, int(opt[1]))
except:
sys.stderr.write('ERROR: %s\r\n%s\r\n' % (sys.exc_info()[1], helpMessage))
sys.exit(-1)
# processing of the following args is postponed till SNMP engine startup
elif opt[0] in ('--agent-udpv4-endpoint',
'--agent-udpv6-endpoint',
'--agent-unix-endpoint') :
v3Args.append(opt)
elif opt[0] in ('--agent-udpv4-endpoints-list',
'--agent-udpv6-endpoints-list',
'--agent-unix-endpoints-list'):
sys.stderr.write('ERROR: use --args-from-file=<file> option to list many endpoints\r\n%s\r\n' % helpMessage)
sys.exit(-1)
elif opt[0] in ('--v3-engine-id', '--v3-user', '--v3-auth-key',
'--v3-auth-proto', '--v3-priv-key', '--v3-priv-proto'):
v3Args.append(opt)
elif opt[0] == '--args-from-file':
try:
v3Args.extend(
[x.split('=', 1) for x in open(opt[1]).read().split()]
)
except:
sys.stderr.write('ERROR: file %s opening failure: %s\r\n%s\r\n' % (opt[1], sys.exc_info()[1], helpMessage))
sys.exit(-1)
if v2cArch and (v3Only or [ x for x in v3Args if x[0][:4] == '--v3' ]):
sys.stderr.write('ERROR: either of --v2c-arch or --v3-* options should be used\r\n%s\r\n' % helpMessage)
sys.exit(-1)
for opt in tuple(v3Args):
if opt[0] == '--agent-udpv4-endpoint':
try:
v3Args.append((opt[0], IPv4TransportEndpoints().add(opt[1])))
except:
sys.stderr.write('ERROR: %s\r\n%s\r\n' % (sys.exc_info()[1], helpMessage))
sys.exit(-1)
elif opt[0] == '--agent-udpv6-endpoint':
try:
v3Args.append((opt[0], IPv6TransportEndpoints().add(opt[1])))
except:
sys.stderr.write('ERROR: %s\r\n%s\r\n' % (sys.exc_info()[1], helpMessage))
sys.exit(-1)
elif opt[0] == '--agent-unix-endpoint':
try:
v3Args.append((opt[0], UnixTransportEndpoints().add(opt[1])))
except:
sys.stderr.write('ERROR: %s\r\n%s\r\n' % (sys.exc_info()[1], helpMessage))
sys.exit(-1)
else:
v3Args.append(opt)
if v3Args[:len(v3Args)//2] == v3Args[len(v3Args)//2:]:
sys.stderr.write('ERROR: agent endpoint address(es) not specified\r\n%s\r\n' % helpMessage)
sys.exit(-1)
else:
v3Args = v3Args[len(v3Args)//2:]
try:
daemon.dropPrivileges(procUser, procGroup)
except:
sys.stderr.write('ERROR: cant drop priveleges: %s\r\n%s\r\n' % (sys.exc_info()[1], helpMessage))
sys.exit(-1)
if not foregroundFlag:
try:
daemon.daemonize(pidFile)
except:
sys.stderr.write('ERROR: cant daemonize process: %s\r\n%s\r\n' % (sys.exc_info()[1], helpMessage))
sys.exit(-1)
# hook up variation modules
for variationModulesDir in confdir.variation:
log.msg('Scanning "%s" directory for variation modules...' % variationModulesDir)
if not os.path.exists(variationModulesDir):
log.msg('Directory "%s" does not exist' % variationModulesDir)
continue
for dFile in os.listdir(variationModulesDir):
if dFile[-3:] != '.py':
continue
_toLoad = []
modName = os.path.splitext(os.path.basename(dFile))[0]
if modName in variationModulesOptions:
while variationModulesOptions[modName]:
alias, args = variationModulesOptions[modName].pop()
_toLoad.append((alias, args))
del variationModulesOptions[modName]
else:
_toLoad.append((modName, ''))
mod = variationModulesDir + os.path.sep + dFile
for alias, args in _toLoad:
if alias in variationModules:
log.msg('WARNING: ignoring duplicate variation module "%s" at "%s"' % (alias, mod))
continue
ctx = { 'path': mod,
'alias': alias,
'args': args,
'moduleContext': {} }
try:
if sys.version_info[0] > 2:
exec(compile(open(mod).read(), mod, 'exec'), ctx)
else:
execfile(mod, ctx)
except Exception:
log.msg('Variation module "%s" execution failure: %s' % (mod, sys.exc_info()[1]))
sys.exit(-1)
else:
# moduleContext, agentContext, recordContext
variationModules[alias] = ctx, {}, {}
log.msg('A total of %s modules found in %s' % (len(variationModules), variationModulesDir))
if variationModulesOptions:
log.msg('WARNING: unused options for variation modules: %s' % ', '.join(variationModulesOptions.keys()))
if not os.path.exists(confdir.cache):
try:
os.makedirs(confdir.cache)
except OSError:
log.msg('ERROR: failed to create cache directory "%s": %s' % (confdir.cache, sys.exc_info()[1]))
sys.exit(-1)
else:
log.msg('Cache directory "%s" created' % confdir.cache)
if variationModules:
log.msg('Initializing variation modules...')
for name, modulesContexts in variationModules.items():
body = modulesContexts[0]
for x in ('init', 'variate', 'shutdown'):
if x not in body:
log.msg('ERROR: missing "%s" handler at variation module "%s"' % (x, name))
sys.exit(-1)
try:
body['init'](options=body['args'], mode='variating')
except Exception:
log.msg('Variation module "%s" load FAILED: %s' % (name,sys.exc_info()[1]))
else:
log.msg('Variation module "%s" loaded OK' % name)
# Build pysnmp Managed Objects base from data files information
def configureManagedObjects(dataDirs, dataIndexInstrumController,
snmpEngine=None, snmpContext=None):
_mibInstrums = {}
_dataFiles = {}
for dataDir in dataDirs:
log.msg('Scanning "%s" directory for %s data files...' % (dataDir, ','.join([' *%s%s' % (os.path.extsep, x.ext) for x in recordSet.values()]))
)
if not os.path.exists(dataDir):
log.msg('Directory "%s" does not exist' % dataDir)
continue
log.msg('%s' % ('='*66,))
for fullPath, textParser, communityName in getDataFiles(dataDir):
if communityName in _dataFiles:
log.msg('WARNING: ignoring duplicate Community/ContextName "%s" for data file %s (%s already loaded)' % (communityName, fullPath, _dataFiles[communityName]))
continue
elif fullPath in _mibInstrums:
mibInstrum = _mibInstrums[fullPath]
log.msg('Configuring *shared* %s' % (mibInstrum,))
else:
dataFile = DataFile(fullPath, textParser).indexText(forceIndexBuild)
mibInstrum = mibInstrumControllerSet[dataFile.layout](dataFile)
_mibInstrums[fullPath] = mibInstrum
_dataFiles[communityName] = fullPath
log.msg('Configuring %s' % (mibInstrum,))
log.msg('SNMPv1/2c community name: %s' % (communityName,))
if v2cArch:
contexts[univ.OctetString(communityName)] = mibInstrum
dataIndexInstrumController.addDataFile(
fullPath, communityName
)
else:
agentName = contextName = md5(univ.OctetString(communityName).asOctets()).hexdigest()
if not v3Only:
config.addV1System(
snmpEngine, agentName, communityName, contextName=contextName
)
snmpContext.registerContextName(contextName, mibInstrum)
dataIndexInstrumController.addDataFile(
fullPath, communityName, contextName
)
log.msg('SNMPv3 context name: %s' % (contextName,))
log.msg('%s' % ('-+' * 33,))
del _mibInstrums
del _dataFiles
if v2cArch:
def getBulkHandler(reqVarBinds, nonRepeaters, maxRepetitions, readNextVars):
N = min(int(nonRepeaters), len(reqVarBinds))
M = int(maxRepetitions)
R = max(len(reqVarBinds)-N, 0)
if R: M = min(M, 100/R) # maxVarBinds
if N:
rspVarBinds = readNextVars(reqVarBinds[:N])
else:
rspVarBinds = []
varBinds = reqVarBinds[-R:]
while M and R:
rspVarBinds.extend(
readNextVars(varBinds)
)
varBinds = rspVarBinds[-R:]
M = M - 1
return rspVarBinds
def commandResponderCbFun(transportDispatcher, transportDomain,
transportAddress, wholeMsg):
while wholeMsg:
msgVer = api.decodeMessageVersion(wholeMsg)
if msgVer in api.protoModules:
pMod = api.protoModules[msgVer]
else:
log.msg('Unsupported SNMP version %s' % (msgVer,))
return
reqMsg, wholeMsg = decoder.decode(
wholeMsg, asn1Spec=pMod.Message(),
)
communityName = reqMsg.getComponentByPosition(1)
for candidate in probeContext(transportDomain, transportAddress, communityName):
if candidate in contexts:
log.msg('Using %s selected by candidate %s; transport ID %s, source address %s, community name "%s"' % (contexts[candidate], candidate, univ.ObjectIdentifier(transportDomain), transportAddress[0], communityName))
communityName = candidate
break
else:
log.msg('No data file selected for transport ID %s, source address %s, community name "%s"' % (univ.ObjectIdentifier(transportDomain), transportAddress[0], communityName))
return wholeMsg
rspMsg = pMod.apiMessage.getResponse(reqMsg)
rspPDU = pMod.apiMessage.getPDU(rspMsg)
reqPDU = pMod.apiMessage.getPDU(reqMsg)
if reqPDU.isSameTypeWith(pMod.GetRequestPDU()):
backendFun = contexts[communityName].readVars
elif reqPDU.isSameTypeWith(pMod.SetRequestPDU()):
backendFun = contexts[communityName].writeVars
elif reqPDU.isSameTypeWith(pMod.GetNextRequestPDU()):
backendFun = contexts[communityName].readNextVars
elif hasattr(pMod, 'GetBulkRequestPDU') and \
reqPDU.isSameTypeWith(pMod.GetBulkRequestPDU()):
if not msgVer:
log.msg('GETBULK over SNMPv1 from %s:%s' % (
transportDomain, transportAddress
))
return wholeMsg
backendFun = lambda varBinds: getBulkHandler(varBinds,
pMod.apiBulkPDU.getNonRepeaters(reqPDU),
pMod.apiBulkPDU.getMaxRepetitions(reqPDU),
contexts[communityName].readNextVars)
else:
log.msg('Unsuppored PDU type %s from %s:%s' % (
reqPDU.__class__.__name__, transportDomain,
transportAddress
))
return wholeMsg
try:
varBinds = backendFun(
pMod.apiPDU.getVarBinds(reqPDU)
)
except NoDataNotification:
return wholeMsg
except:
log.msg('Ignoring SNMP engine failure: %s' % sys.exc_info()[1])
# Poor man's v2c->v1 translation
errorMap = { rfc1902.Counter64.tagSet: 5,
rfc1905.NoSuchObject.tagSet: 2,
rfc1905.NoSuchInstance.tagSet: 2,
rfc1905.EndOfMibView.tagSet: 2 }
if not msgVer:
for idx in range(len(varBinds)):
oid, val = varBinds[idx]
if val.tagSet in errorMap:
varBinds = pMod.apiPDU.getVarBinds(reqPDU)
pMod.apiPDU.setErrorStatus(rspPDU, errorMap[val.tagSet])
pMod.apiPDU.setErrorIndex(rspPDU, idx+1)
break
pMod.apiPDU.setVarBinds(rspPDU, varBinds)
transportDispatcher.sendMessage(
encoder.encode(rspMsg), transportDomain, transportAddress
)
return wholeMsg
else: # v3arch
def probeHashContext(self, snmpEngine, stateReference, contextName):
transportDomain, transportAddress = snmpEngine.msgAndPduDsp.getTransportInfo(stateReference)
for candidate in probeContext(transportDomain, transportAddress, contextName):
probedContextName = md5(candidate).hexdigest()
try:
mibInstrum = self.snmpContext.getMibInstrum(probedContextName)
except error.PySnmpError:
pass
else:
log.msg('Using %s selected by candidate %s; transport ID %s, source address %s, context name "%s"' % (mibInstrum, candidate, univ.ObjectIdentifier(transportDomain), transportAddress[0], probedContextName))
return probedContextName
log.msg('Using %s selected by contextName "%s", transport ID %s, source address %s' % (self.snmpContext.getMibInstrum(contextName), contextName, univ.ObjectIdentifier(transportDomain), transportAddress[0]))
return contextName
class GetCommandResponder(cmdrsp.GetCommandResponder):
def handleMgmtOperation(
self, snmpEngine, stateReference, contextName, PDU, acInfo
):
try:
cmdrsp.GetCommandResponder.handleMgmtOperation(
self, snmpEngine, stateReference,
probeHashContext(self, snmpEngine, stateReference, contextName),
PDU, acInfo
)
except NoDataNotification:
self.releaseStateInformation(stateReference)
class SetCommandResponder(cmdrsp.SetCommandResponder):
def handleMgmtOperation(
self, snmpEngine, stateReference, contextName, PDU, acInfo
):
try:
cmdrsp.SetCommandResponder.handleMgmtOperation(
self, snmpEngine, stateReference,
probeHashContext(self, snmpEngine, stateReference, contextName),
PDU, acInfo
)
except NoDataNotification:
self.releaseStateInformation(stateReference)
class NextCommandResponder(cmdrsp.NextCommandResponder):
def handleMgmtOperation(
self, snmpEngine, stateReference, contextName, PDU, acInfo
):
try:
cmdrsp.NextCommandResponder.handleMgmtOperation(
self, snmpEngine, stateReference,
probeHashContext(self, snmpEngine, stateReference, contextName),
PDU, acInfo
)
except NoDataNotification:
self.releaseStateInformation(stateReference)
class BulkCommandResponder(cmdrsp.BulkCommandResponder):
def handleMgmtOperation(
self, snmpEngine, stateReference, contextName, PDU, acInfo
):
try:
cmdrsp.BulkCommandResponder.handleMgmtOperation(
self, snmpEngine, stateReference,
probeHashContext(self, snmpEngine, stateReference, contextName),
PDU, acInfo
)
except NoDataNotification:
self.releaseStateInformation(stateReference)
# Start configuring SNMP engine(s)
transportDispatcher = AsynsockDispatcher()
if v2cArch:
# Configure access to data index
dataIndexInstrumController = DataIndexInstrumController()
contexts = { univ.OctetString('index'): dataIndexInstrumController }
configureManagedObjects(confdir.data, dataIndexInstrumController)
contexts['index'] = dataIndexInstrumController
agentUDPv4Endpoints = []
agentUDPv6Endpoints = []
agentUnixEndpoints = []
for opt in v3Args:
if opt[0] == '--agent-udpv4-endpoint':
agentUDPv4Endpoints.append(opt[1])
elif opt[0] == '--agent-udpv6-endpoint':
agentUDPv6Endpoints.append(opt[1])
elif opt[0] == '--agent-unix-endpoint':
agentUnixEndpoints.append(opt[1])
if not agentUDPv4Endpoints and \
not agentUDPv6Endpoints and \
not agentUnixEndpoints:
log.msg('ERROR: agent endpoint address(es) not specified for SNMP engine ID %s' % v3EngineId)
sys.exit(-1)
# Configure socket server
transportIndex = transportIdOffset
for agentUDPv4Endpoint in agentUDPv4Endpoints:
transportDomain = udp.domainName + (transportIndex,)
transportIndex += 1
transportDispatcher.registerTransport(
transportDomain, agentUDPv4Endpoint[0]
)
log.msg('Listening at UDP/IPv4 endpoint %s, transport ID %s' % (agentUDPv4Endpoint[1], '.'.join([str(x) for x in transportDomain])))
transportIndex = transportIdOffset
for agentUDPv6Endpoint in agentUDPv6Endpoints:
transportDomain = udp6.domainName + (transportIndex,)
transportIndex += 1
transportDispatcher.registerTransport(
transportDomain, agentUDPv4Endpoint[0]
)
log.msg('Listening at UDP/IPv6 endpoint %s, transport ID %s' % (agentUDPv4Endpoint[1], '.'.join([str(x) for x in transportDomain])))
transportIndex = transportIdOffset
for agentUnixEndpoint in agentUnixEndpoints:
transportDomain = unix.domainName + (transportIndex,)
transportIndex += 1
transportDispatcher.registerTransport(
transportDomain, agentUnixEndpoint[0]
)
log.msg('Listening at UNIX domain socket endpoint %s, transport ID %s' % (agentUnixEndpoint[1], '.'.join([str(x) for x in transportDomain])))
transportDispatcher.registerRecvCbFun(commandResponderCbFun)
else: # v3 mode
if hasattr(transportDispatcher, 'registerRoutingCbFun'):
transportDispatcher.registerRoutingCbFun(lambda td,t,d: td)
else:
log.msg('WARNING: upgrade pysnmp to 4.2.5 or later get multi-engine ID feature working!')
if v3Args and v3Args[0][0] != '--v3-engine-id':
v3Args.insert(0, ('--v3-engine-id', 'auto'))
v3Args.append(('end-of-options', ''))
snmpEngine = None
transportIndex = { 'udpv4': transportIdOffset,
'udpv6': transportIdOffset,
'unix': transportIdOffset }
for opt in v3Args:
if opt[0] in ('--v3-engine-id', 'end-of-options'):
if snmpEngine:
log.msg('%s' % ('*'*66,))
dataIndexInstrumController = DataIndexInstrumController()
configureManagedObjects(dataDirs and dataDirs or confdir.data,
dataIndexInstrumController,
snmpEngine,
snmpContext)
# Configure access to data index
config.addV1System(snmpEngine, 'index',
'index', contextName='index')
log.msg('SNMPv3 EngineID: %s' % (hasattr(snmpEngine, 'snmpEngineID') and snmpEngine.snmpEngineID.prettyPrint() or '<unknown>',))
if not v3Users:
v3Users = [ 'simulator' ]
v3AuthKeys[v3Users[0]] = None not in v3AuthKeys and \
'auctoritas' or v3AuthKeys[None]
v3AuthProtos[v3Users[0]] = None not in v3AuthProtos and \
'MD5' or v3AuthProtos[None]
v3PrivKeys[v3Users[0]] = None not in v3PrivKeys and \
'privatus' or v3PrivKeys[None]
v3PrivProtos[v3Users[0]] = None not in v3PrivProtos and \
'DES' or v3PrivProtos[None]
for v3User in v3Users:
if v3User in v3AuthKeys:
if v3User not in v3AuthProtos:
v3AuthProtos[v3User] = 'MD5'
else:
v3AuthKeys[v3User] = None
v3AuthProtos[v3User] = 'NONE'
if v3User in v3PrivKeys:
if v3User not in v3PrivProtos:
v3PrivProtos[v3User] = 'DES'
else:
v3PrivKeys[v3User] = None
v3PrivProtos[v3User] = 'NONE'
if authProtocols[v3AuthProtos[v3User]] == config.usmNoAuthProtocol and privProtocols[v3PrivProtos[v3User]] != config.usmNoPrivProtocol:
log.msg('ERROR: privacy impossible without authentication for USM user %s' % v3User)
sys.exit(-1)
try:
config.addV3User(
snmpEngine,
v3User,
authProtocols[v3AuthProtos[v3User]],
v3AuthKeys[v3User],
privProtocols[v3PrivProtos[v3User]],
v3PrivKeys[v3User]
)
except error.PySnmpError:
log.msg('ERROR: bad USM values for user %s: %s' % (v3User, sys.exc_info()[1]))
sys.exit(-1)
log.msg('SNMPv3 USM SecurityName: %s' % v3User)
if authProtocols[v3AuthProtos[v3User]] != config.usmNoAuthProtocol:
log.msg('SNMPv3 USM authentication key: %s, authentication protocol: %s' % (v3AuthKeys[v3User], v3AuthProtos[v3User]))
if privProtocols[v3PrivProtos[v3User]] != config.usmNoPrivProtocol:
log.msg('SNMPv3 USM encryption (privacy) key: %s, encryption protocol: %s' % (v3PrivKeys[v3User], v3PrivProtos[v3User]))
snmpContext.registerContextName(
'index', dataIndexInstrumController
)
# Configure socket server
if not agentUDPv4Endpoints and \
not agentUDPv6Endpoints and \
not agentUnixEndpoints:
log.msg('ERROR: agent endpoint address(es) not specified for SNMP engine ID %s' % v3EngineId)
sys.exit(-1)
for agentUDPv4Endpoint in agentUDPv4Endpoints:
transportDomain = udp.domainName + \
(transportIndex['udpv4'],)
transportIndex['udpv4'] += 1
snmpEngine.registerTransportDispatcher(
transportDispatcher, transportDomain
)
config.addSocketTransport(
snmpEngine,
transportDomain, agentUDPv4Endpoint[0]
)
log.msg('Listening at UDP/IPv4 endpoint %s, transport ID %s' % (agentUDPv4Endpoint[1], '.'.join([str(x) for x in transportDomain])))
for agentUDPv6Endpoint in agentUDPv6Endpoints:
transportDomain = udp6.domainName + \
(transportIndex['udpv6'],)
transportIndex['udpv6'] += 1
snmpEngine.registerTransportDispatcher(
transportDispatcher, transportDomain
)
config.addSocketTransport(
snmpEngine,
transportDomain, agentUDPv6Endpoint[0]
)
log.msg('Listening at UDP/IPv6 endpoint %s, transport ID %s' % (agentUDPv6Endpoint[1], '.'.join([str(x) for x in transportDomain])))
for agentUnixEndpoint in agentUnixEndpoints:
transportDomain = unix.domainName + \
(transportIndex['unix'],)
transportIndex['unix'] += 1
snmpEngine.registerTransportDispatcher(
transportDispatcher, transportDomain
)
config.addSocketTransport(
snmpEngine,
transportDomain, agentUnixEndpoint[0]
)
log.msg('Listening at UNIX domain socket endpoint %s, transport ID %s' % (agentUnixEndpoint[1], '.'.join([str(x) for x in transportDomain])))
# SNMP applications
GetCommandResponder(snmpEngine, snmpContext)
SetCommandResponder(snmpEngine, snmpContext)
NextCommandResponder(snmpEngine, snmpContext)
BulkCommandResponder(snmpEngine, snmpContext)
if opt[0] == 'end-of-options':
break
# Prepare for next engine ID configuration
dataDirs = []
v3Users = []
v3AuthKeys = {}; v3AuthProtos = {}
v3PrivKeys = {}; v3PrivProtos = {}
agentUDPv4Endpoints = []
agentUDPv6Endpoints = []
agentUnixEndpoints = []
try:
v3EngineId = opt[1]
if v3EngineId.lower() == 'auto':
snmpEngine = engine.SnmpEngine()
else:
snmpEngine = engine.SnmpEngine(
snmpEngineID=univ.OctetString(hexValue=v3EngineId)
)
except:
log.msg('ERROR: SNMPv3 Engine initialization failed, EngineID "%s": %s' % (v3EngineId, sys.exc_info()[1]))
sys.exit(-1)
config.addContext(snmpEngine, '')
snmpContext = context.SnmpContext(snmpEngine)
elif opt[0] == '--data-dir':
dataDirs.append(opt[1])
elif opt[0] == '--v3-user':
v3Users.append(opt[1])
if None in v3AuthKeys:
v3AuthKeys[None] = v3Users[-1]
elif opt[0] == '--v3-auth-key':
v3AuthKeys[v3Users and v3Users[-1] or None] = opt[1]
elif opt[0] == '--v3-auth-proto':
if opt[1].upper() not in authProtocols:
log.msg('ERROR: bad v3 auth protocol %s' % opt[1])
sys.exit(-1)
else:
v3AuthProtos[v3Users and v3Users[-1] or None] = opt[1].upper()
elif opt[0] == '--v3-priv-key':
v3PrivKeys[v3Users and v3Users[-1] or None] = opt[1]
elif opt[0] == '--v3-priv-proto':
if opt[1].upper() not in privProtocols:
log.msg('ERROR: bad v3 privacy protocol %s' % opt[1])
sys.exit(-1)
else:
v3PrivProtos[v3Users and v3Users[-1] or None] = opt[1].upper()
elif opt[0] == '--agent-udpv4-endpoint':
agentUDPv4Endpoints.append(opt[1])
elif opt[0] == '--agent-udpv6-endpoint':
agentUDPv6Endpoints.append(opt[1])
elif opt[0] == '--agent-unix-endpoint':
agentUnixEndpoints.append(opt[1])
# Run mainloop
transportDispatcher.jobStarted(1) # server job would never finish
# Python 2.4 does not support the "finally" clause
exc_info = None
try:
transportDispatcher.runDispatcher()
except KeyboardInterrupt:
log.msg('Shutting down process...')
except Exception:
exc_info = sys.exc_info()
if variationModules:
log.msg('Shutting down variation modules:')
for name, contexts in variationModules.items():
body = contexts[0]
try:
body['shutdown'](options=body['args'], mode='variation')
except Exception:
log.msg('Variation module "%s" shutdown FAILED: %s' % (name, sys.exc_info()[1]))
else:
log.msg('Variation module "%s" shutdown OK' % name)
transportDispatcher.closeDispatcher()
log.msg('Process terminated')
if exc_info:
for line in traceback.format_exception(*exc_info):
log.msg(line.replace('\n', ';'))
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