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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(
-2147483648, 2147483647
)
class Integer32(univ.Integer):
subtypeSpec = univ.Integer.subtypeSpec+constraint.ValueRangeConstraint(
-2147483648, 2147483647
)
class OctetString(univ.OctetString):
subtypeSpec = univ.Integer.subtypeSpec+constraint.ValueSizeConstraint(
0, 65535
)
# rfc1902 uses a notion of "fixed length string" what might mean
# having zero-range size constraint applied. The following is
# supposed to be used for setting and querying this property.
fixedLength = None
def setFixedLength(self, value):
self.fixedLength = value
return self
def isFixedLength(self):
return self.fixedLength is not None
def getFixedLength(self):
return self.fixedLength
def clone(self, value=None, tagSet=None, subtypeSpec=None,
encoding=None, binValue=None, hexValue=None):
return univ.OctetString.clone(
self, value, tagSet, subtypeSpec, encoding, binValue, hexValue
).setFixedLength(self.getFixedLength())
def subtype(self, value=None, implicitTag=None, explicitTag=None,
subtypeSpec=None):
return univ.OctetString.subtype(
self, value, implicitTag, explicitTag, subtypeSpec
).setFixedLength(self.getFixedLength())
ObjectIdentifier = univ.ObjectIdentifier
class IpAddress(OctetString):
tagSet = OctetString.tagSet.tagImplicitly(
tag.Tag(tag.tagClassApplication, tag.tagFormatSimple, 0x00)
)
subtypeSpec = OctetString.subtypeSpec+constraint.ValueSizeConstraint(
4, 4
)
fixedLength = 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)
value = OctetString.prettyIn(self, value)
if len(value) != 4:
raise error.ProtocolError('Bad IP address syntax')
return value
def prettyOut(self, value):
if value:
return '.'.join(
[ '%d' % x for x in self.__class__(value).asNumbers() ]
)
else:
return ''
class Counter32(univ.Integer):
tagSet = univ.Integer.tagSet.tagImplicitly(
tag.Tag(tag.tagClassApplication, tag.tagFormatSimple, 0x01)
)
subtypeSpec = univ.Integer.subtypeSpec+constraint.ValueRangeConstraint(
0, 4294967295
)
class Gauge32(univ.Integer):
tagSet = univ.Integer.tagSet.tagImplicitly(
tag.Tag(tag.tagClassApplication, tag.tagFormatSimple, 0x02)
)
subtypeSpec = univ.Integer.subtypeSpec+constraint.ValueRangeConstraint(
0, 4294967295
)
class Unsigned32(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 Counter64(univ.Integer):
tagSet = univ.Integer.tagSet.tagImplicitly(
tag.Tag(tag.tagClassApplication, tag.tagFormatSimple, 0x06)
)
subtypeSpec = univ.Integer.subtypeSpec+constraint.ValueRangeConstraint(
0, 18446744073709551615
)
class Bits(OctetString):
namedValues = namedval.NamedValues()
def __init__(self, value=None, tagSet=None, subtypeSpec=None,
encoding=None, binValue=None, hexValue=None,
namedValues=None):
if namedValues is None:
self.__namedValues = self.namedValues
else:
self.__namedValues = namedValues
OctetString.__init__(
self, value, tagSet, subtypeSpec, encoding, binValue, hexValue
)
def prettyIn(self, bits):
if not isinstance(bits, (tuple, list)):
return OctetString.prettyIn(self, 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 OctetString.prettyIn(self, octets)
def prettyOut(self, value):
names = []
ints = self.__class__(value).asNumbers()
i = 0
while i < len(ints):
v = ints[i]
j = 7
while j >= 0:
if v & (0x01<<j):
name = self.__namedValues.getName(i*8+7-j)
if name is None:
name = 'UnknownBit-%s' % (i*8+7-j,)
names.append(name)
j = j - 1
i = i + 1
return ', '.join([ str(x) for x in names ])
def clone(self, value=None, tagSet=None, subtypeSpec=None,
encoding=None, binValue=None, hexValue=None,
namedValues=None):
if value is None and tagSet is None and subtypeSpec is None \
and namedValues is None:
return self
if value is None:
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, encoding,
binValue, hexValue, namedValues)
def subtype(self, value=None, implicitTag=None, explicitTag=None,
subtypeSpec=None, namedValues=None):
if value is None:
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=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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