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1#
2# This file is part of pyasn1-modules software.
3#
4# Copyright (c) 2005-2019, Ilya Etingof <etingof@gmail.com>
5# License: http://snmplabs.com/pyasn1/license.html
6#
7# SNMPv3 message syntax
8#
9# ASN.1 source from:
10# http://www.ietf.org/rfc/rfc3412.txt
11#
12from pyasn1.type import constraint
13from pyasn1.type import namedtype
14from pyasn1.type import univ
15
16from pyasn1_modules import rfc1905
17
18
19class ScopedPDU(univ.Sequence):
20    componentType = namedtype.NamedTypes(
21        namedtype.NamedType('contextEngineId', univ.OctetString()),
22        namedtype.NamedType('contextName', univ.OctetString()),
23        namedtype.NamedType('data', rfc1905.PDUs())
24    )
25
26
27class ScopedPduData(univ.Choice):
28    componentType = namedtype.NamedTypes(
29        namedtype.NamedType('plaintext', ScopedPDU()),
30        namedtype.NamedType('encryptedPDU', univ.OctetString()),
31    )
32
33
34class HeaderData(univ.Sequence):
35    componentType = namedtype.NamedTypes(
36        namedtype.NamedType('msgID',
37                            univ.Integer().subtype(subtypeSpec=constraint.ValueRangeConstraint(0, 2147483647))),
38        namedtype.NamedType('msgMaxSize',
39                            univ.Integer().subtype(subtypeSpec=constraint.ValueRangeConstraint(484, 2147483647))),
40        namedtype.NamedType('msgFlags', univ.OctetString().subtype(subtypeSpec=constraint.ValueSizeConstraint(1, 1))),
41        namedtype.NamedType('msgSecurityModel',
42                            univ.Integer().subtype(subtypeSpec=constraint.ValueRangeConstraint(1, 2147483647)))
43    )
44
45
46class SNMPv3Message(univ.Sequence):
47    componentType = namedtype.NamedTypes(
48        namedtype.NamedType('msgVersion',
49                            univ.Integer().subtype(subtypeSpec=constraint.ValueRangeConstraint(0, 2147483647))),
50        namedtype.NamedType('msgGlobalData', HeaderData()),
51        namedtype.NamedType('msgSecurityParameters', univ.OctetString()),
52        namedtype.NamedType('msgData', ScopedPduData())
53    )
54