def _extended_community(value):
if value[:2].lower() == '0x':
# we could raise if the length is not 8 bytes (16 chars)
if len(value) % 2:
raise ValueError('invalid extended community %s' % value)
raw = concat_bytes_i(
character(int(value[_:_ + 2], 16))
for _ in range(2, len(value), 2))
return ExtendedCommunity.unpack(raw)
elif value.count(':'):
components = value.split(':')
command = 'target' if len(components) == 2 else components.pop(0)
if command not in _HEADER:
raise ValueError(
'invalid extended community %s (only origin,target or l2info are supported) '
% command)
if len(components) != _SIZE[command]:
raise ValueError(
'invalid extended community %s, expecting %d fields ' %
(command, len(components)))
header = _HEADER.get(command, None)
if header is None:
raise ValueError('unknown extended community %s' % command)
if command == 'l2info':
# encaps, control, mtu, site
return ExtendedCommunity.unpack(
header + pack('!BBHH', *[int(_) for _ in components]))
_ga, _la = components
ga, la = _ga.upper(), _la.upper()
if command in ('target', 'origin'):
# global admin, local admin
if '.' in ga or '.' in la:
gc = ga.count('.')
lc = la.count('.')
if gc == 0 and lc == 3:
# ASN first, IP second
return ExtendedCommunity.unpack(header + pack(
'!HBBBB', int(ga), *[int(_) for _ in la.split('.')]))
if gc == 3 and lc == 0:
# IP first, ASN second
return ExtendedCommunity.unpack(
header +
pack('!BBBBH', *[int(_)
for _ in ga.split('.')] + [int(la)]))
iga = int(ga[:-1]) if 'L' in ga else int(ga)
ila = int(la[:-1]) if 'L' in la else int(la)
if command == 'target':
if ga.endswith('L') or iga > _SIZE_H:
return ExtendedCommunity.unpack(
_HEADER['target4'] + pack('!LH', iga, ila), None)
else:
return ExtendedCommunity.unpack(header + pack('!HI', iga, ila),
None)
if command == 'origin':
if ga.endswith('L') or iga > _SIZE_H:
return ExtendedCommunity.unpack(
_HEADER['origin4'] + pack('!LH', iga, ila), None)
else:
return ExtendedCommunity.unpack(header + pack('!HI', iga, ila),
None)
if command == 'target4':
return ExtendedCommunity.unpack(
_HEADER['target4'] + pack('!LH', iga, ila), None)
if command == 'origin4':
return ExtendedCommunity.unpack(
_HEADER['origin4'] + pack('!LH', iga, ila), None)
if command == 'redirect':
return ExtendedCommunity.unpack(header + pack('!HL', iga, ila),
None)
if command == 'bandwidth':
return ExtendedCommunity.unpack(
_HEADER['bandwidth'] + pack('!Hf', iga, ila), None)
raise ValueError('invalid extended community %s' % command)
elif value == 'redirect-to-nexthop':
header = _HEADER[value]
return ExtendedCommunity.unpack(header + pack('!HL', 0, 0), None)
else:
raise ValueError('invalid extended community %s - lc+gc' % value)
def _extended_community (value):
if value[:2].lower() == '0x':
# we could raise if the length is not 8 bytes (16 chars)
if len(value) % 2:
raise ValueError('invalid extended community %s' % value)
raw = ''.join([chr(int(value[_:_+2],16)) for _ in range(2,len(value),2)])
return ExtendedCommunity.unpack(raw)
elif value.count(':'):
components = value.split(':')
command = 'target' if len(components) == 2 else components.pop(0)
if command not in _HEADER:
raise ValueError('invalid extended community %s (only origin,target or l2info are supported) ' % command)
if len(components) != _SIZE[command]:
raise ValueError('invalid extended community %s, expecting %d fields ' % (command,len(components)))
header = _HEADER.get(command,None)
if header is None:
raise ValueError('unknown extended community %s' % command)
if command == 'l2info':
# encaps, control, mtu, site
return ExtendedCommunity.unpack(header+pack('!BBHH',*[int(_) for _ in components]))
_ga,_la = components
ga,la = _ga.upper(),_la.upper()
if command in ('target','origin'):
# global admin, local admin
if '.' in ga or '.' in la:
gc = ga.count('.')
lc = la.count('.')
if gc == 0 and lc == 3:
# ASN first, IP second
return ExtendedCommunity.unpack(header+pack('!HBBBB',int(ga),*[int(_) for _ in la.split('.')]))
if gc == 3 and lc == 0:
# IP first, ASN second
return ExtendedCommunity.unpack(header+pack('!BBBBH',*[int(_) for _ in ga.split('.')]+[int(la)]))
iga = int(ga[:-1]) if 'L' in ga else int(ga)
ila = int(la[:-1]) if 'L' in la else int(la)
if command == 'target':
if ga.endswith('L') or iga > _SIZE_H:
return ExtendedCommunity.unpack(_HEADER['target4']+pack('!LH',iga,ila),None)
else:
return ExtendedCommunity.unpack(header+pack('!HI',iga,ila),None)
if command == 'origin':
if ga.endswith('L') or iga > _SIZE_H:
return ExtendedCommunity.unpack(_HEADER['origin4']+pack('!LH',iga,ila),None)
else:
return ExtendedCommunity.unpack(header+pack('!HI',iga,ila),None)
if command == 'target4':
return ExtendedCommunity.unpack(_HEADER['target4']+pack('!LH',iga,ila),None)
if command == 'orgin4':
return ExtendedCommunity.unpack(_HEADER['origin4']+pack('!LH',iga,ila),None)
if command in ('redirect',):
return ExtendedCommunity.unpack(header+pack('!HL',iga,ila),None)
raise ValueError('invalid extended community %s' % command)
elif value == 'redirect-to-nexthop':
header = _HEADER[value]
return ExtendedCommunity.unpack(header+pack('!HL',0,0),None)
else:
raise ValueError('invalid extended community %s - lc+gc' % value)