120 lines
3.8 KiB
Python
120 lines
3.8 KiB
Python
#
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# This file is part of pysnmp software.
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#
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# Copyright (c) 2005-2017, Ilya Etingof <etingof@gmail.com>
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# License: http://pysnmp.sf.net/license.html
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#
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from pyasn1.type import univ, tag, constraint, namedtype
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from pyasn1.error import PyAsn1Error
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from pysnmp.proto import error
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__all__ = ['Opaque', 'NetworkAddress', 'ObjectName', 'TimeTicks',
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'Counter', 'Gauge', 'IpAddress']
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class IpAddress(univ.OctetString):
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tagSet = univ.OctetString.tagSet.tagImplicitly(
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tag.Tag(tag.tagClassApplication, tag.tagFormatSimple, 0x00)
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)
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subtypeSpec = univ.OctetString.subtypeSpec + constraint.ValueSizeConstraint(
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4, 4
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)
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def prettyIn(self, value):
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if isinstance(value, str) and len(value) != 4:
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try:
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value = [int(x) for x in value.split('.')]
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except:
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raise error.ProtocolError('Bad IP address syntax %s' % value)
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if len(value) != 4:
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raise error.ProtocolError('Bad IP address syntax')
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return univ.OctetString.prettyIn(self, value)
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def prettyOut(self, value):
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if value:
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return '.'.join(['%d' % x for x in self.__class__(value).asNumbers()])
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else:
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return ''
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class Counter(univ.Integer):
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tagSet = univ.Integer.tagSet.tagImplicitly(
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tag.Tag(tag.tagClassApplication, tag.tagFormatSimple, 0x01)
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)
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subtypeSpec = univ.Integer.subtypeSpec + constraint.ValueRangeConstraint(
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0, 4294967295
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)
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class NetworkAddress(univ.Choice):
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componentType = namedtype.NamedTypes(
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namedtype.NamedType('internet', IpAddress())
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)
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class Gauge(univ.Integer):
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tagSet = univ.Integer.tagSet.tagImplicitly(
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tag.Tag(tag.tagClassApplication, tag.tagFormatSimple, 0x02)
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)
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subtypeSpec = univ.Integer.subtypeSpec + constraint.ValueRangeConstraint(
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0, 4294967295
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)
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class TimeTicks(univ.Integer):
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tagSet = univ.Integer.tagSet.tagImplicitly(
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tag.Tag(tag.tagClassApplication, tag.tagFormatSimple, 0x03)
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)
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subtypeSpec = univ.Integer.subtypeSpec + constraint.ValueRangeConstraint(
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0, 4294967295
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)
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class Opaque(univ.OctetString):
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tagSet = univ.OctetString.tagSet.tagImplicitly(
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tag.Tag(tag.tagClassApplication, tag.tagFormatSimple, 0x04)
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)
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class ObjectName(univ.ObjectIdentifier):
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pass
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class TypeCoercionHackMixIn: # XXX keep this old-style class till pyasn1 types becomes new-style
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# Reduce ASN1 type check to simple tag check as SMIv2 objects may
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# not be constraints-compatible with those used in SNMP PDU.
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def _verifyComponent(self, idx, value, **kwargs):
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componentType = self._componentType
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if componentType:
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if idx >= len(componentType):
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raise PyAsn1Error('Component type error out of range')
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t = componentType[idx].getType()
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if not t.getTagSet().isSuperTagSetOf(value.getTagSet()):
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raise PyAsn1Error('Component type error %r vs %r' % (t, value))
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class SimpleSyntax(TypeCoercionHackMixIn, univ.Choice):
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componentType = namedtype.NamedTypes(
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namedtype.NamedType('number', univ.Integer()),
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namedtype.NamedType('string', univ.OctetString()),
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namedtype.NamedType('object', univ.ObjectIdentifier()),
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namedtype.NamedType('empty', univ.Null())
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)
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class ApplicationSyntax(TypeCoercionHackMixIn, univ.Choice):
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componentType = namedtype.NamedTypes(
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namedtype.NamedType('address', NetworkAddress()),
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namedtype.NamedType('counter', Counter()),
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namedtype.NamedType('gauge', Gauge()),
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namedtype.NamedType('ticks', TimeTicks()),
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namedtype.NamedType('arbitrary', Opaque())
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)
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class ObjectSyntax(univ.Choice):
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componentType = namedtype.NamedTypes(
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namedtype.NamedType('simple', SimpleSyntax()),
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namedtype.NamedType('application-wide', ApplicationSyntax())
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)
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