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import types
import string
from pyasn1.type import univ, tag, constraint, namedtype, namedval
from pysnmp.proto import rfc1155, error
class Integer(univ.Integer):
subtypeSpec = univ.Integer.subtypeSpec+constraint.ValueRangeConstraint(
-2147483648L, 2147483647L
)
class Integer32(univ.Integer):
subtypeSpec = univ.Integer.subtypeSpec+constraint.ValueRangeConstraint(
-2147483648L, 2147483647L
)
class OctetString(univ.OctetString):
subtypeSpec = univ.Integer.subtypeSpec+constraint.ValueSizeConstraint(
0, 65535
)
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): return rfc1155.ipAddressPrettyIn(value)
def prettyOut(self, value): return rfc1155.ipAddressPrettyOut(value)
class Counter32(univ.Integer):
tagSet = univ.Integer.tagSet.tagImplicitly(
tag.Tag(tag.tagClassApplication, tag.tagFormatSimple, 0x01)
)
subtypeSpec = univ.Integer.subtypeSpec+constraint.ValueRangeConstraint(
0, 4294967295L
)
class Gauge32(univ.Integer):
tagSet = univ.Integer.tagSet.tagImplicitly(
tag.Tag(tag.tagClassApplication, tag.tagFormatSimple, 0x02)
)
subtypeSpec = univ.Integer.subtypeSpec+constraint.ValueRangeConstraint(
0, 4294967295L
)
class Unsigned32(univ.Integer):
tagSet = univ.Integer.tagSet.tagImplicitly(
tag.Tag(tag.tagClassApplication, tag.tagFormatSimple, 0x02)
)
subtypeSpec = univ.Integer.subtypeSpec+constraint.ValueRangeConstraint(
0, 4294967295L
)
class TimeTicks(univ.Integer):
tagSet = univ.Integer.tagSet.tagImplicitly(
tag.Tag(tag.tagClassApplication, tag.tagFormatSimple, 0x03)
)
subtypeSpec = univ.Integer.subtypeSpec+constraint.ValueRangeConstraint(
0, 4294967295L
)
class Opaque(univ.OctetString):
tagSet = univ.OctetString.tagSet.tagImplicitly(
tag.Tag(tag.tagClassApplication, tag.tagFormatSimple, 0x04)
)
class Counter64(univ.Integer):
tagSet = univ.Integer.tagSet.tagImplicitly(
tag.Tag(tag.tagClassApplication, tag.tagFormatSimple, 0x06)
)
subtypeSpec = univ.Integer.subtypeSpec+constraint.ValueRangeConstraint(
0, 18446744073709551615L
)
class Bits(univ.OctetString):
namedValues = namedval.NamedValues()
def __init__(self, value=None, tagSet=None, subtypeSpec=None,
namedValues=None):
if namedValues is None:
self.__namedValues = self.namedValues
else:
self.__namedValues = namedValues
univ.OctetString.__init__(
self, value, tagSet, subtypeSpec
)
def prettyIn(self, bits):
if type(bits) == types.StringType:
return bits # raw bitstring
octets = []
for bit in bits: # tuple of named bits
v = self.__namedValues.getValue(bit)
if v is None:
raise error.ProtocolError(
'Unknown named bit %s' % bit
)
d, m = divmod(v, 8)
if d >= len(octets):
octets.extend((0,) * (d - len(octets) + 1))
octets[d] = octets[d] | 0x01 << (7-m)
return string.join(map(lambda x: chr(x), octets))
def prettyOut(self, value):
names = []
octets = tuple(map(None, value))
i = 0
while i < len(octets):
v = ord(octets[i])
j = 7
while j > 0:
if v & (0x01<<j):
name = self.__namedValues.getName(i*8+7-j)
if name is None:
raise error.ProtocolError(
'Unknown named value %s' % v
)
names.append(name)
j = j - 1
i = i + 1
return tuple(names)
def clone(self, value=None, tagSet=None, subtypeSpec=None,
namedValues=None):
if value is None and self._value is not self.defaultValue:
value = self._value
if tagSet is None:
tagSet = self._tagSet
if subtypeSpec is None:
subtypeSpec = self._subtypeSpec
if namedValues is None:
namedValues = self.__namedValues
return self.__class__(value, tagSet, subtypeSpec, namedValues)
def subtype(self, value=None, implicitTag=None, explicitTag=None,
subtypeSpec=None, namedValues=None):
if value is None and self._value is not self.defaultValue:
value = self._value
if implicitTag is not None:
tagSet = self._tagSet.tagImplicitly(implicitTag)
elif explicitTag is not None:
tagSet = self._tagSet.tagExplicitly(explicitTag)
else:
tagSet = self._tagSet
if subtypeSpec is None:
subtypeSpec = self._subtypeSpec
else:
subtypeSpec = subtypeSpec + self._subtypeSpec
if namedValues is None:
namedValues = self.__namedValues
else:
namedValues = namedValues + self.__namedValues
return self.__class__(value, tagSet, subtypeSpec, namedValues)
class ObjectName(univ.ObjectIdentifier): pass
class SimpleSyntax(rfc1155.TypeCoercionHackMixIn, univ.Choice):
componentType = namedtype.NamedTypes(
namedtype.NamedType('integer-value', Integer()),
namedtype.NamedType('string-value', OctetString()),
namedtype.NamedType('objectID-value', univ.ObjectIdentifier())
)
class ApplicationSyntax(rfc1155.TypeCoercionHackMixIn, univ.Choice):
componentType = namedtype.NamedTypes(
namedtype.NamedType('ipAddress-value', IpAddress()),
namedtype.NamedType('counter-value', Counter32()),
namedtype.NamedType('timeticks-value', TimeTicks()),
namedtype.NamedType('arbitrary-value', Opaque()),
namedtype.NamedType('big-counter-value', Counter64()),
# This conflicts with Counter32
# namedtype.NamedType('unsigned-integer-value', Unsigned32()),
namedtype.NamedType('gauge32-value', Gauge32())
) # BITS misplaced?
class ObjectSyntax(univ.Choice):
componentType = namedtype.NamedTypes(
namedtype.NamedType('simple', SimpleSyntax()),
namedtype.NamedType('application-wide', ApplicationSyntax())
)
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