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#
# This file is part of pysnmp software.
#
# Copyright (c) 2005-2017, Ilya Etingof <etingof@gmail.com>
# License: http://pysnmp.sf.net/license.html
#
from pyasn1.type import univ, tag, constraint, namedtype
from pyasn1.error import PyAsn1Error
from pysnmp.proto import error
__all__ = ['Opaque', 'NetworkAddress', 'ObjectName', 'TimeTicks',
'Counter', 'Gauge', 'IpAddress']
class IpAddress(univ.OctetString):
tagSet = univ.OctetString.tagSet.tagImplicitly(
tag.Tag(tag.tagClassApplication, tag.tagFormatSimple, 0x00)
)
subtypeSpec = univ.OctetString.subtypeSpec + constraint.ValueSizeConstraint(
4, 4
)
def prettyIn(self, value):
if isinstance(value, str) and len(value) != 4:
try:
value = [int(x) for x in value.split('.')]
except:
raise error.ProtocolError('Bad IP address syntax %s' % value)
if len(value) != 4:
raise error.ProtocolError('Bad IP address syntax')
return univ.OctetString.prettyIn(self, value)
def prettyOut(self, value):
if value:
return '.'.join(['%d' % x for x in self.__class__(value).asNumbers()])
else:
return ''
class Counter(univ.Integer):
tagSet = univ.Integer.tagSet.tagImplicitly(
tag.Tag(tag.tagClassApplication, tag.tagFormatSimple, 0x01)
)
subtypeSpec = univ.Integer.subtypeSpec + constraint.ValueRangeConstraint(
0, 4294967295
)
class NetworkAddress(univ.Choice):
componentType = namedtype.NamedTypes(
namedtype.NamedType('internet', IpAddress())
)
def clone(self, value=univ.noValue, **kwargs):
"""Clone this instance.
If *value* is specified, use its tag as the component type selector,
and itself as the component value.
:param value: (Optional) the component value.
:type value: :py:obj:`pyasn1.type.base.Asn1ItemBase`
:return: the cloned instance.
:rtype: :py:obj:`pysnmp.proto.rfc1155.NetworkAddress`
:raise: :py:obj:`pysnmp.smi.error.SmiError`:
if the type of *value* is not allowed for this Choice instance.
"""
cloned = univ.Choice.clone(self, **kwargs)
if value is not univ.noValue:
if isinstance(value, NetworkAddress):
value = value.getComponent()
elif not isinstance(value, IpAddress):
# IpAddress is the only supported type, perhaps forever because
# this is SNMPv1.
value = IpAddress(value)
try:
tagSet = value.tagSet
except AttributeError:
raise PyAsn1Error('component value %r has no tag set' % (value,))
cloned.setComponentByType(tagSet, value)
return cloned
# RFC 1212, section 4.1.6:
#
# "(5) NetworkAddress-valued: `n+1' sub-identifiers, where `n'
# depends on the kind of address being encoded (the first
# sub-identifier indicates the kind of address, value 1
# indicates an IpAddress);"
def cloneFromName(self, value, impliedFlag, parentRow, parentIndices):
kind = value[0]
clone = self.clone()
if kind == 1:
clone['internet'] = tuple(value[1:5])
return clone, value[5:]
else:
raise SmiError('unknown NetworkAddress type %r' % (kind,))
def cloneAsName(self, impliedFlag, parentRow, parentIndices):
kind = self.getName()
component = self.getComponent()
if kind == 'internet':
return (1,) + tuple(component.asNumbers())
else:
raise SmiError('unknown NetworkAddress type %r' % (kind,))
class Gauge(univ.Integer):
tagSet = univ.Integer.tagSet.tagImplicitly(
tag.Tag(tag.tagClassApplication, tag.tagFormatSimple, 0x02)
)
subtypeSpec = univ.Integer.subtypeSpec + constraint.ValueRangeConstraint(
0, 4294967295
)
class TimeTicks(univ.Integer):
tagSet = univ.Integer.tagSet.tagImplicitly(
tag.Tag(tag.tagClassApplication, tag.tagFormatSimple, 0x03)
)
subtypeSpec = univ.Integer.subtypeSpec + constraint.ValueRangeConstraint(
0, 4294967295
)
class Opaque(univ.OctetString):
tagSet = univ.OctetString.tagSet.tagImplicitly(
tag.Tag(tag.tagClassApplication, tag.tagFormatSimple, 0x04)
)
class ObjectName(univ.ObjectIdentifier):
pass
class TypeCoercionHackMixIn: # XXX keep this old-style class till pyasn1 types becomes new-style
# Reduce ASN1 type check to simple tag check as SMIv2 objects may
# not be constraints-compatible with those used in SNMP PDU.
def _verifyComponent(self, idx, value, **kwargs):
componentType = self._componentType
if componentType:
if idx >= len(componentType):
raise PyAsn1Error('Component type error out of range')
t = componentType[idx].getType()
if not t.getTagSet().isSuperTagSetOf(value.getTagSet()):
raise PyAsn1Error('Component type error %r vs %r' % (t, value))
class SimpleSyntax(TypeCoercionHackMixIn, 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 ApplicationSyntax(TypeCoercionHackMixIn, 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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