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#
# This file is part of snmpsim software.
#
# Copyright (c) 2010-2019, Ilya Etingof <etingof@gmail.com>
# License: http://snmplabs.com/snmpsim/license.html
#
# Managed value variation module: simulate a live Agent using
# a series of snapshots.
#
import os
import time
import bisect
from pyasn1.compat.octets import str2octs
from pysnmp.proto import rfc1902
from snmpsim.record.snmprec import SnmprecRecord
from snmpsim.record.search.file import searchRecordByOid, getRecord
from snmpsim.record.search.database import RecordIndex
from snmpsim import confdir
from snmpsim.mltsplit import split
from snmpsim import log
from snmpsim import error
def init(**context):
if context['options']:
for k, v in [split(x, ':') for x in split(context['options'], ',')]:
if k == 'addon':
if k in moduleContext:
moduleContext[k].append(v)
else:
moduleContext[k] = [v]
else:
moduleContext[k] = v
if context['mode'] == 'variating':
moduleContext['booted'] = time.time()
elif context['mode'] == 'recording':
if 'dir' not in moduleContext:
raise error.SnmpsimError('SNMP snapshots directory not specified')
if not os.path.exists(moduleContext['dir']):
log.msg('multiplex: creating %s...' % moduleContext['dir'])
os.makedirs(moduleContext['dir'])
if 'iterations' in moduleContext:
moduleContext['iterations'] = max(0, int(moduleContext['iterations']) - 1)
if 'period' in moduleContext:
moduleContext['period'] = float(moduleContext['period'])
else:
moduleContext['period'] = 10.0
moduleContext['ready'] = True
def variate(oid, tag, value, **context):
if 'settings' not in recordContext:
recordContext['settings'] = dict([split(x, '=') for x in split(value, ',')])
if 'dir' not in recordContext['settings']:
log.msg('multiplex: snapshot directory not specified')
return context['origOid'], tag, context['errorStatus']
recordContext['settings']['dir'] = recordContext['settings']['dir'].replace(
'/', os.path.sep
)
if recordContext['settings']['dir'][0] != os.path.sep:
for x in confdir.data:
d = os.path.join(x, recordContext['settings']['dir'])
if os.path.exists(d):
break
else:
log.msg('multiplex: directory %s not found' % recordContext['settings']['dir'])
return context['origOid'], tag, context['errorStatus']
else:
d = recordContext['settings']['dir']
recordContext['dirmap'] = dict(
[(int(os.path.basename(x).split(os.path.extsep)[0]), os.path.join(d, x)) for x in os.listdir(d) if
x[-7:] == 'snmprec']
)
recordContext['keys'] = list(
recordContext['dirmap'].keys()
)
recordContext['bounds'] = (
min(recordContext['keys']), max(recordContext['keys'])
)
if 'period' in recordContext['settings']:
recordContext['settings']['period'] = float(recordContext['settings']['period'])
else:
recordContext['settings']['period'] = 60.0
if 'wrap' in recordContext['settings']:
recordContext['settings']['wrap'] = bool(recordContext['settings']['wrap'])
else:
recordContext['settings']['wrap'] = False
if 'control' in recordContext['settings']:
recordContext['settings']['control'] = rfc1902.ObjectName(
recordContext['settings']['control']
)
log.msg('multiplex: using control OID %s for subtree %s, time-based multiplexing disabled' % (recordContext['settings']['control'], oid))
recordContext['ready'] = True
if 'ready' not in recordContext:
return context['origOid'], tag, context['errorStatus']
if oid not in moduleContext:
moduleContext[oid] = {}
if context['setFlag']:
if 'control' in recordContext['settings'] and \
recordContext['settings']['control'] == context['origOid']:
fileno = int(context['origValue'])
if fileno >= len(recordContext['keys']):
log.msg('multiplex: .snmprec file number %s over limit of %s' % (fileno, len(recordContext['keys'])))
return context['origOid'], tag, context['errorStatus']
moduleContext[oid]['fileno'] = fileno
log.msg('multiplex: switched to file #%s (%s)' % (recordContext['keys'][fileno], recordContext['dirmap'][recordContext['keys'][fileno]]))
return context['origOid'], tag, context['origValue']
else:
return context['origOid'], tag, context['errorStatus']
if 'control' in recordContext['settings']:
if 'fileno' not in moduleContext[oid]:
moduleContext[oid]['fileno'] = 0
if (not context['nextFlag'] and
recordContext['settings']['control'] == context['origOid']):
return context['origOid'], tag, rfc1902.Integer32(moduleContext[oid]['fileno'])
else:
timeslot = (time.time() - moduleContext['booted']) % (
recordContext['settings']['period'] * len(recordContext['dirmap']))
fileslot = int(timeslot / recordContext['settings']['period']) + recordContext['bounds'][0]
fileno = bisect.bisect(recordContext['keys'], fileslot) - 1
if ('fileno' not in moduleContext[oid] or
moduleContext[oid]['fileno'] < fileno or
recordContext['settings']['wrap']):
moduleContext[oid]['fileno'] = fileno
datafile = recordContext['dirmap'][
recordContext['keys'][moduleContext[oid]['fileno']]
]
if ('datafile' not in moduleContext[oid] or
moduleContext[oid]['datafile'] != datafile):
if 'datafileobj' in moduleContext[oid]:
moduleContext[oid]['datafileobj'].close()
moduleContext[oid]['datafileobj'] = RecordIndex(
datafile, SnmprecRecord()
).create()
moduleContext[oid]['datafile'] = datafile
log.msg('multiplex: switching to data file %s for %s' % (datafile, context['origOid']))
text, db = moduleContext[oid]['datafileobj'].getHandles()
textOid = str(rfc1902.OctetString('.'.join(['%s' % x for x in context['origOid']])))
try:
line = moduleContext[oid]['datafileobj'].lookup(textOid)
except KeyError:
offset = searchRecordByOid(context['origOid'], text, SnmprecRecord())
exactMatch = False
else:
offset, subtreeFlag, prevOffset = line.split(str2octs(','))
exactMatch = True
text.seek(int(offset))
line, _, _ = getRecord(text) # matched line
if context['nextFlag']:
if exactMatch:
line, _, _ = getRecord(text)
else:
if not exactMatch:
return context['origOid'], tag, context['errorStatus']
if not line:
return context['origOid'], tag, context['errorStatus']
try:
oid, value = SnmprecRecord().evaluate(line)
except error.SnmpsimError:
oid, value = context['origOid'], context['errorStatus']
return oid, tag, value
def record(oid, tag, value, **context):
if 'ready' not in moduleContext:
raise error.SnmpsimError('module not initialized')
if 'started' not in moduleContext:
moduleContext['started'] = time.time()
if context['stopFlag']:
if 'file' in moduleContext:
moduleContext['file'].close()
del moduleContext['file']
else:
moduleContext['filenum'] = 0
if 'iterations' in moduleContext and moduleContext['iterations']:
log.msg('multiplex: %s iterations remaining' % moduleContext['iterations'])
moduleContext['started'] = time.time()
moduleContext['iterations'] -= 1
moduleContext['filenum'] += 1
wait = max(0, moduleContext['period'] - (time.time() - moduleContext['started']))
raise error.MoreDataNotification(period=wait)
else:
raise error.NoDataNotification()
if 'file' not in moduleContext:
if 'filenum' not in moduleContext:
moduleContext['filenum'] = 0
snmprecfile = os.path.join(moduleContext['dir'],
'%.5d%ssnmprec' % (moduleContext['filenum'],
os.path.extsep))
moduleContext['file'] = open(snmprecfile, 'wb')
log.msg('multiplex: writing into %s file...' % snmprecfile)
moduleContext['file'].write(
SnmprecRecord().format(context['origOid'], context['origValue'])
)
if not context['total']:
settings = {
'dir': moduleContext['dir'].replace(os.path.sep, '/')
}
if 'period' in moduleContext:
settings['period'] = '%.2f' % float(moduleContext['period'])
if 'addon' in moduleContext:
settings.update(
dict([split(x, '=') for x in moduleContext['addon']])
)
value = ','.join(['%s=%s' % (k, v) for k, v in settings.items()])
return str(context['startOID']), ':multiplex', value
else:
raise error.NoDataNotification()
def shutdown(**context):
pass
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