def attribute(tokeniser):
start = tokeniser()
if start != '[':
raise ValueError('invalid attribute, does not starts with [')
code = tokeniser().lower()
if not code.startswith('0x'):
raise ValueError('invalid attribute, code is not 0x hexadecimal')
try:
code = int(code, 16)
except ValueError:
raise ValueError('invalid attribute, code is not 0x hexadecimal')
flag = tokeniser().lower()
if not flag.startswith('0x'):
raise ValueError('invalid attribute, flag is not 0x hexadecimal')
try:
flag = int(flag, 16)
except ValueError:
raise ValueError('invalid attribute, flag is not 0x hexadecimal')
data = tokeniser().lower()
if not data.startswith('0x'):
raise ValueError('invalid attribute, data is not 0x hexadecimal')
if len(data) % 2:
raise ValueError('invalid attribute, data is not 0x hexadecimal')
data = concat_bytes_i(
character(int(data[_:_ + 2], 16)) for _ in range(2, len(data), 2))
end = tokeniser()
if end != ']':
raise ValueError('invalid attribute, does not ends with ]')
return GenericAttribute(code, flag, data)
def generic_attribute(self, scope, name, command, tokens):
try:
start = tokens.pop(0)
code = tokens.pop(0).lower()
flag = tokens.pop(0).lower()
data = tokens.pop(0).lower()
end = tokens.pop(0)
if (start, end) != ('[', ']'):
return self.error.set(self.syntax)
if not code.startswith('0x'):
return self.error.set(self.syntax)
code = int(code[2:], 16)
if not flag.startswith('0x'):
return self.error.set(self.syntax)
flag = int(flag[2:], 16)
if not data.startswith('0x'):
return self.error.set(self.syntax)
raw = ''
for i in range(2, len(data), 2):
raw += chr(int(data[i:i + 2], 16))
try:
for ((ID, _),
klass) in Attribute.registered_attributes.iteritems():
if code == ID and flag == klass.FLAG:
scope[-1]['announce'][-1].attributes.add(
klass.unpack(raw, None))
return True
except Exception:
pass
scope[-1]['announce'][-1].attributes.add(
GenericAttribute(code, flag, raw))
return True
except (IndexError, ValueError):
return self.error.set(self.syntax)
def attribute (tokeniser):
start = tokeniser()
if start != '[':
raise ValueError('invalid attribute, does not starts with [')
code = tokeniser().lower()
if not code.startswith('0x'):
raise ValueError('invalid attribute, code is not 0x hexadecimal')
try:
code = int(code[2:],16)
except ValueError:
raise ValueError('invalid attribute, code is not 0x hexadecimal')
flag = tokeniser().lower()
if not flag.startswith('0x'):
raise ValueError('invalid attribute, flag is not 0x hexadecimal')
try:
flag = int(flag[2:],16)
except ValueError:
raise ValueError('invalid attribute, flag is not 0x hexadecimal')
data = tokeniser().lower()
if not data.startswith('0x'):
raise ValueError('invalid attribute, data is not 0x hexadecimal')
if not len(data) % 2:
raise ValueError('invalid attribute, data is not 0x hexadecimal')
data = ''.join(chr(int(data[_:_+2],16)) for _ in range(2,len(data),2))
end = tokeniser()
if end != ']':
raise ValueError('invalid attribute, does not ends with ]')
# XXX: FIXME: class Attribute should have an unpack function which does that
from exabgp.bgp.message.update.attribute import GenericAttribute
for ((ID,flag),klass) in Attribute.registered_attributes.iteritems():
if code == ID and flag == klass.FLAG:
return klass(data)
return GenericAttribute(code,flag,data)
