1#
2# This file is part of pyasn1-modules software.
3#
4# Copyright (c) 2005-2017, Ilya Etingof <etingof@gmail.com>
5# License: http://pyasn1.sf.net/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 univ, namedtype, constraint
13from pyasn1_modules import rfc1905
14
15
16class ScopedPDU(univ.Sequence):
17    componentType = namedtype.NamedTypes(
18        namedtype.NamedType('contextEngineId', univ.OctetString()),
19        namedtype.NamedType('contextName', univ.OctetString()),
20        namedtype.NamedType('data', rfc1905.PDUs())
21    )
22
23
24class ScopedPduData(univ.Choice):
25    componentType = namedtype.NamedTypes(
26        namedtype.NamedType('plaintext', ScopedPDU()),
27        namedtype.NamedType('encryptedPDU', univ.OctetString()),
28    )
29
30
31class HeaderData(univ.Sequence):
32    componentType = namedtype.NamedTypes(
33        namedtype.NamedType('msgID',
34                            univ.Integer().subtype(subtypeSpec=constraint.ValueRangeConstraint(0, 2147483647))),
35        namedtype.NamedType('msgMaxSize',
36                            univ.Integer().subtype(subtypeSpec=constraint.ValueRangeConstraint(484, 2147483647))),
37        namedtype.NamedType('msgFlags', univ.OctetString().subtype(subtypeSpec=constraint.ValueSizeConstraint(1, 1))),
38        namedtype.NamedType('msgSecurityModel',
39                            univ.Integer().subtype(subtypeSpec=constraint.ValueRangeConstraint(1, 2147483647)))
40    )
41
42
43class SNMPv3Message(univ.Sequence):
44    componentType = namedtype.NamedTypes(
45        namedtype.NamedType('msgVersion',
46                            univ.Integer().subtype(subtypeSpec=constraint.ValueRangeConstraint(0, 2147483647))),
47        namedtype.NamedType('msgGlobalData', HeaderData()),
48        namedtype.NamedType('msgSecurityParameters', univ.OctetString()),
49        namedtype.NamedType('msgData', ScopedPduData())
50    )
51