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Dir : ~/lib/python3/dist-packages/pyasn1_modules/

Edit File: rfc1155.py

#
# This file is part of pyasn1-modules software.
#
# Copyright (c) 2005-2017, Ilya Etingof <etingof@gmail.com>
# License: http://pyasn1.sf.net/license.html
#
# SNMPv1 message syntax
#
# ASN.1 source from:
# http://www.ietf.org/rfc/rfc1155.txt
#
# Sample captures from:
# http://wiki.wireshark.org/SampleCaptures/
#
from pyasn1.type import constraint
from pyasn1.type import namedtype
from pyasn1.type import tag
from pyasn1.type import univ

class ObjectName(univ.ObjectIdentifier):
    pass

class SimpleSyntax(univ.Choice):
    componentType = namedtype.NamedTypes(
        namedtype.NamedType('number', univ.Integer()),
        namedtype.NamedType('string', univ.OctetString()),
        namedtype.NamedType('object', univ.ObjectIdentifier()),
        namedtype.NamedType('empty', univ.Null())
    )

class IpAddress(univ.OctetString):
    tagSet = univ.OctetString.tagSet.tagImplicitly(
        tag.Tag(tag.tagClassApplication, tag.tagFormatSimple, 0)
    )
    subtypeSpec = univ.Integer.subtypeSpec + constraint.ValueSizeConstraint(
        4, 4
    )

class NetworkAddress(univ.Choice):
    componentType = namedtype.NamedTypes(
        namedtype.NamedType('internet', IpAddress())
    )

class Counter(univ.Integer):
    tagSet = univ.Integer.tagSet.tagImplicitly(
        tag.Tag(tag.tagClassApplication, tag.tagFormatSimple, 1)
    )
    subtypeSpec = univ.Integer.subtypeSpec + constraint.ValueRangeConstraint(
        0, 4294967295
    )

class Gauge(univ.Integer):
    tagSet = univ.Integer.tagSet.tagImplicitly(
        tag.Tag(tag.tagClassApplication, tag.tagFormatSimple, 2)
    )
    subtypeSpec = univ.Integer.subtypeSpec + constraint.ValueRangeConstraint(
        0, 4294967295
    )

class TimeTicks(univ.Integer):
    tagSet = univ.Integer.tagSet.tagImplicitly(
        tag.Tag(tag.tagClassApplication, tag.tagFormatSimple, 3)
    )
    subtypeSpec = univ.Integer.subtypeSpec + constraint.ValueRangeConstraint(
        0, 4294967295
    )

class Opaque(univ.OctetString):
    tagSet = univ.OctetString.tagSet.tagImplicitly(
        tag.Tag(tag.tagClassApplication, tag.tagFormatSimple, 4)
    )

class ApplicationSyntax(univ.Choice):
    componentType = namedtype.NamedTypes(
        namedtype.NamedType('address', NetworkAddress()),
        namedtype.NamedType('counter', Counter()),
        namedtype.NamedType('gauge', Gauge()),
        namedtype.NamedType('ticks', TimeTicks()),
        namedtype.NamedType('arbitrary', Opaque())
    )

class ObjectSyntax(univ.Choice):
    componentType = namedtype.NamedTypes(
        namedtype.NamedType('simple', SimpleSyntax()),
        namedtype.NamedType('application-wide', ApplicationSyntax())
    )