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#
# 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 univ, namedtype, namedval, tag, constraint
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())
)
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