def parse(self, data, negotiated):
if not data:
return self
try:
# We do not care if the attribute are transitive or not as we do not redistribute
flag = Attribute.Flag(ord(data[0]))
aid = Attribute.CODE(ord(data[1]))
except IndexError:
self.add(TreatAsWithdraw())
return self
try:
offset = 3
length = ord(data[2])
if flag & Attribute.Flag.EXTENDED_LENGTH:
offset = 4
length = (length << 8) + ord(data[3])
except IndexError:
self.add(TreatAsWithdraw(aid))
return self
data = data[offset:]
left = data[length:]
attribute = data[:length]
logger = Logger()
logger.parser(LazyAttribute(flag, aid, length, data[:length]))
# remove the PARTIAL bit before comparaison if the attribute is optional
if aid in Attribute.attributes_optional:
flag &= Attribute.Flag.MASK_PARTIAL & 0xFF
# flag &= ~Attribute.Flag.PARTIAL & 0xFF # cleaner than above (python use signed integer for ~)
if aid in self:
if aid in self.NO_DUPLICATE:
raise Notify(
3, 1, 'multiple attribute for %s' %
str(Attribute.CODE(attribute.ID)))
logger.parser(
'duplicate attribute %s (flag 0x%02X, aid 0x%02X) skipping' %
(Attribute.CODE.names.get(aid, 'unset'), flag, aid))
return self.parse(left, negotiated)
# handle the attribute if we know it
if Attribute.registered(aid, flag):
if length == 0 and aid not in self.VALID_ZERO:
self.add(TreatAsWithdraw(aid))
return self.parse(left, negotiated)
try:
decoded = Attribute.unpack(aid, flag, attribute, negotiated)
except IndexError, exc:
if aid in self.TREAT_AS_WITHDRAW:
decoded = TreatAsWithdraw(aid)
else:
raise exc
except Notify, exc:
if aid in self.TREAT_AS_WITHDRAW:
decoded = TreatAsWithdraw()
elif aid in self.DISCARD:
decoded = Discard()
else:
raise exc
def parse(self, data, direction, negotiated):
if not data:
return self
try:
# We do not care if the attribute are transitive or not as we do not redistribute
flag = Attribute.Flag(data[0])
aid = Attribute.CODE(data[1])
except IndexError:
self.add(TreatAsWithdraw())
return self
try:
offset = 3
length = data[2]
if flag & Attribute.Flag.EXTENDED_LENGTH:
offset = 4
length = (length << 8) + data[3]
except IndexError:
self.add(TreatAsWithdraw(aid))
return self
data = data[offset:]
left = data[length:]
attribute = data[:length]
logfunc.debug(lazyattribute(flag, aid, length, data[:length]), 'parser')
# remove the PARTIAL bit before comparaison if the attribute is optional
if aid in Attribute.attributes_optional:
flag &= Attribute.Flag.MASK_PARTIAL & 0xFF
# flag &= ~Attribute.Flag.PARTIAL & 0xFF # cleaner than above (python use signed integer for ~)
if aid in self:
if aid in self.NO_DUPLICATE:
raise Notify(3, 1, 'multiple attribute for %s' % str(Attribute.CODE(attribute.ID)))
log.debug(
'duplicate attribute %s (flag 0x%02X, aid 0x%02X) skipping'
% (Attribute.CODE.names.get(aid, 'unset'), flag, aid),
'parser',
)
return self.parse(left, direction, negotiated)
# handle the attribute if we know it
if Attribute.registered(aid, flag):
if length == 0 and aid not in self.VALID_ZERO:
self.add(TreatAsWithdraw(aid))
return self.parse(left, direction, negotiated)
try:
decoded = Attribute.unpack(aid, flag, attribute, direction, negotiated)
except IndexError as exc:
if aid in self.TREAT_AS_WITHDRAW:
decoded = TreatAsWithdraw(aid)
else:
raise exc
except Notify as exc:
if aid in self.TREAT_AS_WITHDRAW:
decoded = TreatAsWithdraw()
elif aid in self.DISCARD:
decoded = Discard()
else:
raise exc
self.add(decoded)
return self.parse(left, direction, negotiated)
# XXX: FIXME: we could use a fallback function here like capability
# if we know the attribute but the flag is not what the RFC says.
if aid in Attribute.attributes_known:
if aid in self.TREAT_AS_WITHDRAW:
log.debug(
'invalid flag for attribute %s (flag 0x%02X, aid 0x%02X) treat as withdraw'
% (Attribute.CODE.names.get(aid, 'unset'), flag, aid),
'parser',
)
self.add(TreatAsWithdraw())
if aid in self.DISCARD:
log.debug(
'invalid flag for attribute %s (flag 0x%02X, aid 0x%02X) discard'
% (Attribute.CODE.names.get(aid, 'unset'), flag, aid),
'parser',
)
return self.parse(left, direction, negotiated)
# XXX: Check if we are missing any
log.debug(
'invalid flag for attribute %s (flag 0x%02X, aid 0x%02X) unspecified (should not happen)'
% (Attribute.CODE.names.get(aid, 'unset'), flag, aid),
'parser',
)
return self.parse(left, direction, negotiated)
# it is an unknown transitive attribute we need to pass on
if flag & Attribute.Flag.TRANSITIVE:
log.debug('unknown transitive attribute (flag 0x%02X, aid 0x%02X)' % (flag, aid), 'parser')
try:
decoded = GenericAttribute(aid, flag | Attribute.Flag.PARTIAL, attribute)
except IndexError:
decoded = TreatAsWithdraw(aid)
self.add(decoded, attribute)
return self.parse(left, direction, negotiated)
# it is an unknown non-transitive attribute we can ignore.
log.debug('ignoring unknown non-transitive attribute (flag 0x%02X, aid 0x%02X)' % (flag, aid), 'parser')
return self.parse(left, direction, negotiated)