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from pyasn1.type import univ
from pyasn1.codec.ber import decoder
from pyasn1.error import PyAsn1Error
from pysnmp.proto.error import ProtocolError
def decodeMessageVersion(wholeMsg):
try:
seq, wholeMsg = decoder.decode(
wholeMsg, asn1Spec=univ.Sequence(), recursiveFlag=0
)
ver, wholeMsg = decoder.decode(
wholeMsg, asn1Spec=univ.Integer(), recursiveFlag=0
)
return ver
except PyAsn1Error:
raise ProtocolError('Invalid BER at SNMP version component')
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