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#
# This file is part of pysnmp software.
#
# Copyright (c) 2005-2020, Ilya Etingof <etingof@gmail.com>
# License: https://www.pysnmp.com/pysnmp/license.html
#
from pyasn1.type import constraint, namedtype, namedval, tag, univ
from pysnmp.proto import rfc1902
__all__ = [
"unSpecified",
"EndOfMibView",
"ReportPDU",
"UnSpecified",
"BulkPDU",
"SNMPv2TrapPDU",
"GetRequestPDU",
"NoSuchObject",
"GetNextRequestPDU",
"GetBulkRequestPDU",
"NoSuchInstance",
"ResponsePDU",
"noSuchObject",
"InformRequestPDU",
"endOfMibView",
"SetRequestPDU",
"noSuchInstance",
]
# 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("") # noqa: N816
class NoSuchObject(univ.Null):
"""No Such Object exception."""
tagSet = univ.Null.tagSet.tagImplicitly( # noqa: N815
tag.Tag(tag.tagClassContext, tag.tagFormatSimple, 0x00)
)
def prettyPrint(self, scope=0): # noqa: N802
"""Return a human-readable string representation of the exception."""
return "No Such Object currently exists at this OID"
noSuchObject = NoSuchObject("") # noqa: N816
class NoSuchInstance(univ.Null):
"""No Such Instance exception."""
tagSet = univ.Null.tagSet.tagImplicitly( # noqa: N815
tag.Tag(tag.tagClassContext, tag.tagFormatSimple, 0x01)
)
def prettyPrint(self, scope=0): # noqa: N802
"""Return a human-readable string representation of the exception."""
return "No Such Instance currently exists at this OID"
noSuchInstance = NoSuchInstance("") # noqa: N816
class EndOfMibView(univ.Null):
"""End of MIB View exception."""
tagSet = univ.Null.tagSet.tagImplicitly( # noqa: N815
tag.Tag(tag.tagClassContext, tag.tagFormatSimple, 0x02)
)
def prettyPrint(self, scope=0): # noqa: N802
"""Return a human-readable string representation of the exception."""
return "No more variables left in this MIB View"
endOfMibView = EndOfMibView("") # noqa: N816
# Made a separate class for better readability
class _BindValue(univ.Choice):
componentType = namedtype.NamedTypes( # noqa: N815
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):
"""VarBind class."""
componentType = namedtype.NamedTypes( # noqa: N815
namedtype.NamedType("name", rfc1902.ObjectName()),
namedtype.NamedType("", _BindValue()),
)
class VarBindList(univ.SequenceOf):
"""VarBindList class."""
componentType = VarBind() # noqa: N815
subtypeSpec = univ.SequenceOf.subtypeSpec + constraint.ValueSizeConstraint(
0, max_bindings
) # noqa: N815
errorStatus = univ.Integer( # noqa: N816
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):
"""PDU class."""
componentType = namedtype.NamedTypes( # noqa: N815
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( # noqa: N816
subtypeSpec=constraint.ValueRangeConstraint(0, max_bindings)
)
maxRepetitions = univ.Integer().subtype( # noqa: N816
subtypeSpec=constraint.ValueRangeConstraint(0, max_bindings)
)
# Base class for bulk PDU
class BulkPDU(univ.Sequence):
"""BulkPDU class."""
componentType = namedtype.NamedTypes( # noqa: N815
namedtype.NamedType("request-id", rfc1902.Integer32()),
namedtype.NamedType("non-repeaters", nonRepeaters),
namedtype.NamedType("max-repetitions", maxRepetitions),
namedtype.NamedType("variable-bindings", VarBindList()),
)
class GetRequestPDU(PDU):
"""GetRequest PDU."""
tagSet = PDU.tagSet.tagImplicitly( # noqa: N815
tag.Tag(tag.tagClassContext, tag.tagFormatConstructed, 0)
)
class GetNextRequestPDU(PDU):
"""GetNextRequest PDU."""
tagSet = PDU.tagSet.tagImplicitly( # noqa: N815
tag.Tag(tag.tagClassContext, tag.tagFormatConstructed, 1)
)
class ResponsePDU(PDU):
"""Response PDU."""
tagSet = PDU.tagSet.tagImplicitly( # noqa: N815
tag.Tag(tag.tagClassContext, tag.tagFormatConstructed, 2)
)
class SetRequestPDU(PDU):
"""SetRequest PDU."""
tagSet = PDU.tagSet.tagImplicitly( # noqa: N815
tag.Tag(tag.tagClassContext, tag.tagFormatConstructed, 3)
)
class GetBulkRequestPDU(BulkPDU):
"""GetBulkRequest PDU."""
tagSet = PDU.tagSet.tagImplicitly( # noqa: N815
tag.Tag(tag.tagClassContext, tag.tagFormatConstructed, 5)
)
class InformRequestPDU(PDU):
"""InformRequest PDU."""
tagSet = PDU.tagSet.tagImplicitly( # noqa: N815
tag.Tag(tag.tagClassContext, tag.tagFormatConstructed, 6)
)
class SNMPv2TrapPDU(PDU):
"""SNMPv2Trap PDU."""
tagSet = PDU.tagSet.tagImplicitly( # noqa: N815
tag.Tag(tag.tagClassContext, tag.tagFormatConstructed, 7)
)
class ReportPDU(PDU):
"""Report PDU."""
tagSet = PDU.tagSet.tagImplicitly( # noqa: N815
tag.Tag(tag.tagClassContext, tag.tagFormatConstructed, 8)
)
class PDUs(univ.Choice):
"""PDUs class."""
componentType = namedtype.NamedTypes( # noqa: N815
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()),
)
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