def prettyIn(self, value):
"""Dotted -> tuple of numerics OID converter"""
if isinstance(value, tuple):
pass
elif isinstance(value, ObjectIdentifier):
return tuple(value)
elif octets.isStringType(value):
r = []
for element in [ x for x in value.split('.') if x != '' ]:
try:
r.append(int(element, 0))
except ValueError:
raise error.PyAsn1Error(
'Malformed Object ID %s at %s: %s' %
(str(value), self.__class__.__name__, sys.exc_info()[1])
)
value = tuple(r)
else:
try:
value = tuple(value)
except TypeError:
raise error.PyAsn1Error(
'Malformed Object ID %s at %s: %s' %
(str(value), self.__class__.__name__,sys.exc_info()[1])
)
for x in value:
if not isinstance(x, intTypes) or x < 0:
raise error.PyAsn1Error(
'Invalid sub-ID in %s at %s' % (value, self.__class__.__name__)
)
return value
def prettyIn(self, value):
"""Dotted -> tuple of numerics OID converter"""
if isinstance(value, tuple):
pass
elif isinstance(value, ObjectIdentifier):
return tuple(value)
elif octets.isStringType(value):
r = []
for element in [ x for x in value.split('.') if x != '' ]:
try:
r.append(int(element, 0))
except ValueError:
raise error.PyAsn1Error(
'Malformed Object ID %s at %s: %s' %
(str(value), self.__class__.__name__, sys.exc_info()[1])
)
value = tuple(r)
else:
try:
value = tuple(value)
except TypeError:
raise error.PyAsn1Error(
'Malformed Object ID %s at %s: %s' %
(str(value), self.__class__.__name__,sys.exc_info()[1])
)
for x in value:
if not isinstance(x, intTypes) or x < 0:
raise error.PyAsn1Error(
'Invalid sub-ID in %s at %s' % (value, self.__class__.__name__)
)
return value
def prettyIn(self, value):
if isinstance(value, RelativeOID):
return tuple(value)
elif isStringType(value):
if '-' in value:
raise error.PyAsn1Error(
'Malformed RELATIVE-OID %s at %s: %s' %
(value, self.__class__.__name__, sys.exc_info()[1]))
try:
return tuple(
[int(subOid) for subOid in value.split('.') if subOid])
except ValueError:
raise error.PyAsn1Error(
'Malformed RELATIVE-OID %s at %s: %s' %
(value, self.__class__.__name__, sys.exc_info()[1]))
try:
tupleOfInts = tuple(
[int(subOid) for subOid in value if subOid >= 0])
except (ValueError, TypeError):
raise error.PyAsn1Error(
'Malformed RELATIVE-OID %s at %s: %s' %
(value, self.__class__.__name__, sys.exc_info()[1]))
if len(tupleOfInts) == len(value):
return tupleOfInts
raise error.PyAsn1Error('Malformed RELATIVE-OID %s at %s' %
(value, self.__class__.__name__))
def prettyIn(self, value): # override asn1 type method
"""Implements DISPLAY-HINT parsing into base SNMP value
Proper parsing seems impossible due to ambiguities.
Here we are trying to do our best, but be prepared
for failures on complicated DISPLAY-HINTs.
Keep in mind that this parser only works with "text"
input meaning `unicode` (Py2) or `str` (Py3).
"""
for base in inspect.getmro(self.__class__):
if not issubclass(base, TextualConvention) and issubclass(
base, Asn1Item):
break
else:
raise SmiError(
'TEXTUAL-CONVENTION has no underlying SNMP base type')
if self.displayHint and (
self.__integer.isSuperTypeOf(self, matchConstraints=False)
and self.getNamedValues() or self.__unsigned32.isSuperTypeOf(
self, matchConstraints=False) or
self.__timeticks.isSuperTypeOf(self, matchConstraints=False)):
value = str(value)
_ = lambda t, f=0: (t, f)
displayHintType, decimalPrecision = _(*self.displayHint.split('-'))
if displayHintType == 'x' and (value.startswith('0x')
or value.startswith('-0x')):
try:
if value.startswith('-'):
return base.prettyIn(self, -int(value[3:], 16))
else:
return base.prettyIn(self, int(value[2:], 16))
except Exception:
raise SmiError('integer evaluation error: %s' %
sys.exc_info()[1])
elif displayHintType == 'd':
try:
return base.prettyIn(
self, int(float(value) * 10**int(decimalPrecision)))
except Exception:
raise SmiError('float evaluation error: %s' %
sys.exc_info()[1])
elif displayHintType == 'o' and (value.startswith('0')
or value.startswith('-0')):
try:
return base.prettyIn(self, int(value, 8))
except Exception:
raise SmiError('octal evaluation error: %s' %
sys.exc_info()[1])
elif displayHintType == 'b' and (value.startswith('B')
or value.startswith('-B')):
negative = value.startswith('-')
if negative:
value = value[2:]
else:
value = value[1:]
value = [x != '0' and 1 or 0 for x in value]
binValue = 0
while value:
binValue <<= value[0]
del value[0]
return base.prettyIn(self, binValue)
else:
raise SmiError('Unsupported numeric type spec "%s" at %s' %
(displayHintType, self.__class__.__name__))
elif self.displayHint and self.__octetString.isSuperTypeOf(
self, matchConstraints=False):
numBase = {'x': 16, 'd': 10, 'o': 8}
numDigits = {
'x': octets.str2octs(string.hexdigits),
'o': octets.str2octs(string.octdigits),
'd': octets.str2octs(string.digits)
}
# how do we know if object is initialized with display-hint
# formatted text? based on "text" input maybe?
# That boils down to `str` object on Py3 or `unicode` on Py2.
if octets.isStringType(value) and not octets.isOctetsType(value):
value = base.prettyIn(self, value)
else:
return base.prettyIn(self, value)
outputValue = octets.str2octs('')
runningValue = value
displayHint = self.displayHint
while runningValue and displayHint:
# 1 this information is totally lost, just fail explicitly
if displayHint[0] == '*':
raise SmiError('Can\'t parse "*" in DISPLAY-HINT (%s)' %
self.__class__.__name__)
# 2 this becomes ambiguous when it comes to rendered value
octetLength = ''
while displayHint and displayHint[0] in string.digits:
octetLength += displayHint[0]
displayHint = displayHint[1:]
# length is mandatory but people ignore that
if not octetLength:
octetLength = len(runningValue)
try:
octetLength = int(octetLength)
except Exception:
raise SmiError('Bad octet length: %s' % octetLength)
if not displayHint:
raise SmiError('Short octet length: %s' % self.displayHint)
# 3
displayFormat = displayHint[0]
displayHint = displayHint[1:]
# 4 this is the lifesaver -- we could use it as an anchor
if displayHint and displayHint[
0] not in string.digits and displayHint[0] != '*':
displaySep = displayHint[0]
displayHint = displayHint[1:]
else:
displaySep = ''
# 5 is probably impossible to support
if displayFormat in ('a', 't'):
outputValue += runningValue[:octetLength]
elif displayFormat in numBase:
if displaySep:
guessedOctetLength = runningValue.find(
octets.str2octs(displaySep))
if guessedOctetLength == -1:
guessedOctetLength = len(runningValue)
else:
for idx in range(len(runningValue)):
if runningValue[idx] not in numDigits[
displayFormat]:
guessedOctetLength = idx
break
else:
guessedOctetLength = len(runningValue)
try:
num = int(
octets.octs2str(runningValue[:guessedOctetLength]),
numBase[displayFormat])
except Exception:
raise SmiError('Display format eval failure: %s: %s' %
(runningValue[:guessedOctetLength],
sys.exc_info()[1]))
num_as_bytes = []
if num:
while num:
num_as_bytes.append(num & 0xFF)
num >>= 8
else:
num_as_bytes = [0]
while len(num_as_bytes) < octetLength:
num_as_bytes.append(0)
num_as_bytes.reverse()
outputValue += octets.ints2octs(num_as_bytes)
if displaySep:
guessedOctetLength += 1
octetLength = guessedOctetLength
else:
raise SmiError('Unsupported display format char: %s' %
displayFormat)
runningValue = runningValue[octetLength:]
if not displayHint:
displayHint = self.displayHint
return base.prettyIn(self, outputValue)
else:
return base.prettyIn(self, value)
def test_isStringType(self):
assert octets.isStringType('abc') == True
assert octets.isStringType(123) == False
assert octets.isStringType(unicode('abc')) == True
def test_isStringType(self):
assert octets.isStringType('abc') == True
assert octets.isStringType(123) == False
assert octets.isStringType(bytes()) == False
def prettyIn(self, value): # override asn1 type method
"""Implements DISPLAY-HINT parsing into base SNMP value
Proper parsing seems impossible due to ambiguities.
Here we are trying to do our best, but be prepared
for failures on complicated DISPLAY-HINTs.
Keep in mind that this parser only works with "text"
input meaning `unicode` (Py2) or `str` (Py3).
"""
for base in inspect.getmro(self.__class__):
if not issubclass(base, TextualConvention) and issubclass(base, Asn1Item):
break
else:
raise SmiError('TEXTUAL-CONVENTION has no underlying SNMP base type')
if self.displayHint and (self.__integer.isSuperTypeOf(self, matchConstraints=False) and
self.getNamedValues() or
self.__unsigned32.isSuperTypeOf(self, matchConstraints=False) or
self.__timeticks.isSuperTypeOf(self, matchConstraints=False)):
value = str(value)
_ = lambda t, f=0: (t, f)
displayHintType, decimalPrecision = _(*self.displayHint.split('-'))
if displayHintType == 'x' and (value.startswith('0x') or value.startswith('-0x')):
try:
if value.startswith('-'):
return base.prettyIn(self, -int(value[3:], 16))
else:
return base.prettyIn(self, int(value[2:], 16))
except Exception as exc:
raise SmiError(
'integer evaluation error: %s' % exc
)
elif displayHintType == 'd':
try:
return base.prettyIn(self, int(float(value) * 10**int(decimalPrecision)))
except Exception as exc:
raise SmiError(
'float evaluation error: %s' % exc
)
elif displayHintType == 'o' and (value.startswith('0') or value.startswith('-0')):
try:
return base.prettyIn(self, int(value, 8))
except Exception as exc:
raise SmiError(
'octal evaluation error: %s' % exc
)
elif displayHintType == 'b' and (value.startswith('B') or value.startswith('-B')):
negative = value.startswith('-')
if negative:
value = value[2:]
else:
value = value[1:]
value = [x != '0' and 1 or 0 for x in value]
binValue = 0
while value:
binValue <<= value[0]
del value[0]
return base.prettyIn(self, binValue)
else:
raise SmiError(
'Unsupported numeric type spec "%s" at %s' % (displayHintType, self.__class__.__name__)
)
elif self.displayHint and self.__octetString.isSuperTypeOf(self, matchConstraints=False):
numBase = {
'x': 16,
'd': 10,
'o': 8
}
numDigits = {
'x': octets.str2octs(string.hexdigits),
'o': octets.str2octs(string.octdigits),
'd': octets.str2octs(string.digits)
}
# how do we know if object is initialized with display-hint
# formatted text? based on "text" input maybe?
# That boils down to `str` object on Py3 or `unicode` on Py2.
if octets.isStringType(value) and not octets.isOctetsType(value):
value = base.prettyIn(self, value)
else:
return base.prettyIn(self, value)
outputValue = octets.str2octs('')
runningValue = value
displayHint = self.displayHint
while runningValue and displayHint:
# 1 this information is totally lost, just fail explicitly
if displayHint[0] == '*':
raise SmiError(
'Can\'t parse "*" in DISPLAY-HINT (%s)' % self.__class__.__name__
)
# 2 this becomes ambiguous when it comes to rendered value
octetLength = ''
while displayHint and displayHint[0] in string.digits:
octetLength += displayHint[0]
displayHint = displayHint[1:]
# length is mandatory but people ignore that
if not octetLength:
octetLength = len(runningValue)
try:
octetLength = int(octetLength)
except Exception:
raise SmiError(
'Bad octet length: %s' % octetLength
)
if not displayHint:
raise SmiError(
'Short octet length: %s' % self.displayHint
)
# 3
displayFormat = displayHint[0]
displayHint = displayHint[1:]
# 4 this is the lifesaver -- we could use it as an anchor
if displayHint and displayHint[0] not in string.digits and displayHint[0] != '*':
displaySep = displayHint[0]
displayHint = displayHint[1:]
else:
displaySep = ''
# 5 is probably impossible to support
if displayFormat in ('a', 't'):
outputValue += runningValue[:octetLength]
elif displayFormat in numBase:
if displaySep:
guessedOctetLength = runningValue.find(octets.str2octs(displaySep))
if guessedOctetLength == -1:
guessedOctetLength = len(runningValue)
else:
for idx in range(len(runningValue)):
if runningValue[idx] not in numDigits[displayFormat]:
guessedOctetLength = idx
break
else:
guessedOctetLength = len(runningValue)
try:
num = int(octets.octs2str(runningValue[:guessedOctetLength]), numBase[displayFormat])
except Exception as exc:
raise SmiError(
'Display format eval failure: %s: %s'
% (runningValue[:guessedOctetLength], exc)
)
num_as_bytes = []
if num:
while num:
num_as_bytes.append(num & 0xFF)
num >>= 8
else:
num_as_bytes = [0]
while len(num_as_bytes) < octetLength:
num_as_bytes.append(0)
num_as_bytes.reverse()
outputValue += octets.ints2octs(num_as_bytes)
if displaySep:
guessedOctetLength += 1
octetLength = guessedOctetLength
else:
raise SmiError(
'Unsupported display format char: %s' %
displayFormat
)
runningValue = runningValue[octetLength:]
if not displayHint:
displayHint = self.displayHint
return base.prettyIn(self, outputValue)
else:
return base.prettyIn(self, value)
def __getitem__(self, idx):
if octets.isStringType(idx):
nameToPosIdx = self.__getNameToPosIdx()
return self.__namedTypes[nameToPosIdx[idx]]
else:
return self.__namedTypes[idx]
def __getitem__(self, idx):
if octets.isStringType(idx):
nameToPosIdx = self.__getNameToPosIdx()
return self.__namedTypes[nameToPosIdx[idx]]
else:
return self.__namedTypes[idx]
