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from pyasn1.type import univ, tag, constraint, namedtype
from pyasn1.error import PyAsn1Error
from pysnmp.proto import error
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())
)
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
# 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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