1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
|
from pyasn1.type import univ, tag, constraint, namedtype, namedval
from pysnmp.proto import rfc1902
# Value reference -- max bindings in VarBindList
max_bindings = rfc1902.Integer(2147483647)
# Take SNMP exception values out of BindValue structure for convenience
UnSpecified = univ.Null
unSpecified = UnSpecified()
class NoSuchObject(univ.Null):
tagSet = univ.Null.tagSet.tagImplicitly(
tag.Tag(tag.tagClassContext, tag.tagFormatSimple, 0x00)
)
def prettyPrint(self, scope=0):
return 'No Such Object currently exists at this OID'
noSuchObject = NoSuchObject()
class NoSuchInstance(univ.Null):
tagSet = univ.Null.tagSet.tagImplicitly(
tag.Tag(tag.tagClassContext, tag.tagFormatSimple, 0x01)
)
def prettyPrint(self, scope=0):
return 'No Such Instance currently exists at this OID'
noSuchInstance = NoSuchInstance()
class EndOfMibView(univ.Null):
tagSet = univ.Null.tagSet.tagImplicitly(
tag.Tag(tag.tagClassContext, tag.tagFormatSimple, 0x02)
)
def prettyPrint(self, scope=0):
return 'No more variables left in this MIB View'
endOfMibView = EndOfMibView()
# Made a separate class for better readability
class _BindValue(univ.Choice):
componentType = namedtype.NamedTypes(
namedtype.NamedType('value', rfc1902.ObjectSyntax()),
namedtype.NamedType('unSpecified', unSpecified),
namedtype.NamedType('noSuchObject', noSuchObject),
namedtype.NamedType('noSuchInstance', noSuchInstance),
namedtype.NamedType('endOfMibView', endOfMibView)
)
class VarBind(univ.Sequence):
componentType = namedtype.NamedTypes(
namedtype.NamedType('name', rfc1902.ObjectName()),
namedtype.NamedType('', _BindValue())
)
class VarBindList(univ.SequenceOf):
componentType = VarBind()
subtypeSpec = univ.SequenceOf.subtypeSpec + constraint.ValueSizeConstraint(
0, max_bindings
)
_errorStatus = univ.Integer(namedValues=namedval.NamedValues(('noError', 0), ('tooBig', 1), ('noSuchName', 2), ('badValue', 3), ('readOnly', 4), ('genErr', 5), ('noAccess', 6), ('wrongType', 7), ('wrongLength', 8), ('wrongEncoding', 9), ('wrongValue', 10), ('noCreation', 11), ('inconsistentValue', 12), ('resourceUnavailable', 13), ('commitFailed', 14), ('undoFailed', 15), ('authorizationError', 16), ('notWritable', 17), ('inconsistentName', 18)))
# Base class for a non-bulk PDU
class PDU(univ.Sequence):
componentType = namedtype.NamedTypes(
namedtype.NamedType('request-id', rfc1902.Integer32()),
namedtype.NamedType('error-status', _errorStatus),
namedtype.NamedType('error-index', univ.Integer().subtype(subtypeSpec=constraint.ValueRangeConstraint(0, max_bindings))),
namedtype.NamedType('variable-bindings', VarBindList())
)
_nonRepeaters = univ.Integer().subtype(subtypeSpec=constraint.ValueRangeConstraint(0, max_bindings))
_maxRepetitions = univ.Integer().subtype(subtypeSpec=constraint.ValueRangeConstraint(0, max_bindings))
# Base class for bulk PDU
class BulkPDU(univ.Sequence):
componentType = namedtype.NamedTypes(
namedtype.NamedType('request-id', rfc1902.Integer32()),
namedtype.NamedType('non-repeaters', _nonRepeaters),
namedtype.NamedType('max-repetitions', _maxRepetitions),
namedtype.NamedType('variable-bindings', VarBindList())
)
class GetRequestPDU(PDU):
tagSet = PDU.tagSet.tagImplicitly(
tag.Tag(tag.tagClassContext, tag.tagFormatConstructed, 0)
)
class GetNextRequestPDU(PDU):
tagSet = PDU.tagSet.tagImplicitly(
tag.Tag(tag.tagClassContext, tag.tagFormatConstructed, 1)
)
class ResponsePDU(PDU):
tagSet = PDU.tagSet.tagImplicitly(
tag.Tag(tag.tagClassContext, tag.tagFormatConstructed, 2)
)
class SetRequestPDU(PDU):
tagSet = PDU.tagSet.tagImplicitly(
tag.Tag(tag.tagClassContext, tag.tagFormatConstructed, 3)
)
class GetBulkRequestPDU(BulkPDU):
tagSet = PDU.tagSet.tagImplicitly(
tag.Tag(tag.tagClassContext, tag.tagFormatConstructed, 5)
)
class InformRequestPDU(PDU):
tagSet = PDU.tagSet.tagImplicitly(
tag.Tag(tag.tagClassContext, tag.tagFormatConstructed, 6)
)
class SNMPv2TrapPDU(PDU):
tagSet = PDU.tagSet.tagImplicitly(
tag.Tag(tag.tagClassContext, tag.tagFormatConstructed, 7)
)
class ReportPDU(PDU):
tagSet = PDU.tagSet.tagImplicitly(
tag.Tag(tag.tagClassContext, tag.tagFormatConstructed, 8)
)
class PDUs(univ.Choice):
componentType = namedtype.NamedTypes(
namedtype.NamedType('get-request', GetRequestPDU()),
namedtype.NamedType('get-next-request', GetNextRequestPDU()),
namedtype.NamedType('get-bulk-request', GetBulkRequestPDU()),
namedtype.NamedType('response', ResponsePDU()),
namedtype.NamedType('set-request', SetRequestPDU()),
namedtype.NamedType('inform-request', InformRequestPDU()),
namedtype.NamedType('snmpV2-trap', SNMPv2TrapPDU()),
namedtype.NamedType('report', ReportPDU())
)
|
