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#
# This file is part of pysnmp software.
#
# Copyright (c) 2005-2020, Ilya Etingof <etingof@gmail.com>
# License: https://www.pysnmp.com/pysnmp/license.html
#
from pyasn1.codec.ber import decoder, eoo
from pyasn1.error import PyAsn1Error
from pyasn1.type import univ
from pysnmp.proto.error import ProtocolError
def decode_message_version(wholeMsg):
"""Decode SNMP version from the message."""
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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