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#
# This file is part of pysnmp software.
#
# Copyright (c) 2005-2019, Ilya Etingof <etingof@gmail.com>
# License: http://snmplabs.com/pysnmp/license.html
#
from pyasn1.type import univ
from pyasn1.codec.ber import decoder, eoo
from pyasn1.error import PyAsn1Error
from pysnmp.proto.error import ProtocolError
def decodeMessageVersion(wholeMsg):
try:
seq, wholeMsg = decoder.decode(
wholeMsg, asn1Spec=univ.Sequence(),
recursiveFlag=False, substrateFun=lambda a, b, c: (a, b[:c])
)
ver, wholeMsg = decoder.decode(
wholeMsg, asn1Spec=univ.Integer(),
recursiveFlag=False, substrateFun=lambda a, b, c: (a, b[:c])
)
if eoo.endOfOctets.isSameTypeWith(ver):
raise ProtocolError('EOO at SNMP version component')
return ver
except PyAsn1Error as exc:
raise ProtocolError('Invalid BER at SNMP version component: %s' % exc)
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