def unpack (data,negotiated): communities = ExtendedCommunities() while data: if data and len(data) < 8: raise Notify(3,1,'could not decode extended community %s' % str([hex(ord(_)) for _ in data])) communities.add(ExtendedCommunity.unpack(data[:8],negotiated)) data = data[8:] return communities
def unpack (data,negotiated): communities = ExtendedCommunities() while data: if data and len(data) < 8: raise Notify(3,1,'could not decode extended community %s' % str([hex(ord(_)) for _ in data])) communities.add(ExtendedCommunity.unpack(data[:8],negotiated)) data = data[8:] return communities
def _extended_community (value):
if value[:2].lower() == '0x':
if not len(value) % 2:
raise ValueError('invalid extended community %s' % value)
try:
raw = ''
for i in range(2,len(value),2):
raw += chr(int(value[i:i+2],16))
except ValueError:
raise ValueError('invalid extended community %s' % value)
if len(raw) != 8:
raise ValueError('invalid extended community %s' % value)
return ExtendedCommunity.unpack(raw)
elif value.count(':'):
_known_community = {
# header and subheader
'target' : chr(0x00)+chr(0x02),
'target4' : chr(0x02)+chr(0x02),
'origin' : chr(0x00)+chr(0x03),
'origin4' : chr(0x02)+chr(0x03),
'l2info' : chr(0x80)+chr(0x0A),
}
_size_community = {
'target' : 2,
'target4' : 2,
'origin' : 2,
'origin4' : 2,
'l2info' : 4,
}
components = value.split(':')
command = 'target' if len(components) == 2 else components.pop(0)
if command not in _known_community:
raise ValueError('invalid extended community %s (only origin,target or l2info are supported) ' % command)
if len(components) != _size_community[command]:
raise ValueError('invalid extended community %s, expecting %d fields ' % (command,len(components)))
header = _known_community[command]
if command == 'l2info':
# encaps, control, mtu, site
return ExtendedCommunity.unpack(header+pack('!BBHH',*[int(_) for _ in components]))
if command in ('target','origin'):
# global admin, local admin
ga,la = components
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)]))
else:
if command == 'target':
if ga.upper().endswith('L'):
return ExtendedCommunity.unpack(_known_community['target4']+pack('!LH',int(ga[:-1]),int(la)))
else:
return ExtendedCommunity.unpack(header+pack('!HI',int(ga),int(la)))
if command == 'origin':
if ga.upper().endswith('L'):
return ExtendedCommunity.unpack(_known_community['origin4']+pack('!LH',int(ga),int(la)))
else:
return ExtendedCommunity.unpack(header+pack('!IH',int(ga),int(la)))
raise ValueError('invalid extended community %s' % command)
else:
raise ValueError('invalid extended community %s - lc+gc' % value)
def _parse_extended_community (self, scope, data):
SIZE_H = 0xFFFF
if data[:2].lower() == '0x':
try:
raw = ''
for i in range(2,len(data),2):
raw += chr(int(data[i:i+2],16))
except ValueError:
raise ValueError('invalid extended community %s' % data)
if len(raw) != 8:
raise ValueError('invalid extended community %s' % data)
return ExtendedCommunity.unpack(raw,None)
elif data.count(':'):
_known_community = {
# header and subheader
'target': chr(0x00)+chr(0x02),
'target4': chr(0x02)+chr(0x02),
'origin': chr(0x00)+chr(0x03),
'origin4': chr(0x02)+chr(0x03),
'redirect': chr(0x80)+chr(0x08),
'l2info': chr(0x80)+chr(0x0A),
}
_size_community = {
'target': 2,
'target4': 2,
'origin': 2,
'origin4': 2,
'redirect': 2,
'l2info': 4,
}
components = data.split(':')
command = 'target' if len(components) == 2 else components.pop(0)
if command not in _known_community:
raise ValueError('invalid extended community %s (only origin,target or l2info are supported) ' % command)
if len(components) != _size_community[command]:
raise ValueError('invalid extended community %s, expecting %d fields ' % (command,len(components)))
header = _known_community[command]
if command == 'l2info':
# encaps, control, mtu, site
return ExtendedCommunity.unpack(header+pack('!BBHH',*[int(_) for _ in components]),None)
if command in ('target','origin'):
# global admin, local admin
_ga,_la = components
ga,la = _ga.upper(),_la.upper()
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('.')]),None)
if gc == 3 and lc == 0:
# IP first, ASN second
return ExtendedCommunity.unpack(header+pack('!BBBBH',*[int(_) for _ in ga.split('.')]+[int(la)]),None)
else:
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(_known_community['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(_known_community['origin4']+pack('!LH',iga,ila),None)
else:
return ExtendedCommunity.unpack(header+pack('!HI',iga,ila),None)
if command == 'target4':
iga = int(ga[:-1]) if 'L' in ga else int(ga)
ila = int(la[:-1]) if 'L' in la else int(la)
return ExtendedCommunity.unpack(_known_community['target4']+pack('!LH',iga,ila),None)
if command == 'orgin4':
iga = int(ga[:-1]) if 'L' in ga else int(ga)
ila = int(la[:-1]) if 'L' in la else int(la)
return ExtendedCommunity.unpack(_known_community['origin4']+pack('!LH',iga,ila),None)
if command in ('redirect',):
ga,la = components
return ExtendedCommunity.unpack(header+pack('!HL',int(ga),long(la)),None)
raise ValueError('invalid extended community %s' % command)
else:
raise ValueError('invalid extended community %s - lc+gc' % data)
def _parse_extended_community(self, scope, data):
SIZE_H = 0xFFFF
if data[:2].lower() == '0x':
try:
raw = ''
for i in range(2, len(data), 2):
raw += chr(int(data[i:i + 2], 16))
except ValueError:
raise ValueError('invalid extended community %s' % data)
if len(raw) != 8:
raise ValueError('invalid extended community %s' % data)
return ExtendedCommunity.unpack(raw, None)
elif data.count(':'):
_known_community = {
# header and subheader
'target': chr(0x00) + chr(0x02),
'target4': chr(0x02) + chr(0x02),
'origin': chr(0x00) + chr(0x03),
'origin4': chr(0x02) + chr(0x03),
'redirect': chr(0x80) + chr(0x08),
'l2info': chr(0x80) + chr(0x0A),
}
_size_community = {
'target': 2,
'target4': 2,
'origin': 2,
'origin4': 2,
'redirect': 2,
'l2info': 4,
}
components = data.split(':')
command = 'target' if len(components) == 2 else components.pop(0)
if command not in _known_community:
raise ValueError(
'invalid extended community %s (only origin,target or l2info are supported) '
% command)
if len(components) != _size_community[command]:
raise ValueError(
'invalid extended community %s, expecting %d fields ' %
(command, len(components)))
header = _known_community[command]
if command == 'l2info':
# encaps, control, mtu, site
return ExtendedCommunity.unpack(
header + pack('!BBHH', *[int(_) for _ in components]),
None)
if command in ('target', 'origin'):
# global admin, local admin
_ga, _la = components
ga, la = _ga.upper(), _la.upper()
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('.')]),
None)
if gc == 3 and lc == 0:
# IP first, ASN second
return ExtendedCommunity.unpack(
header +
pack('!BBBBH', *
[int(_) for _ in ga.split('.')] + [int(la)]),
None)
else:
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(
_known_community['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(
_known_community['origin4'] +
pack('!LH', iga, ila), None)
else:
return ExtendedCommunity.unpack(
header + pack('!HI', iga, ila), None)
if command == 'target4':
iga = int(ga[:-1]) if 'L' in ga else int(ga)
ila = int(la[:-1]) if 'L' in la else int(la)
return ExtendedCommunity.unpack(
_known_community['target4'] + pack('!LH', iga, ila), None)
if command == 'orgin4':
iga = int(ga[:-1]) if 'L' in ga else int(ga)
ila = int(la[:-1]) if 'L' in la else int(la)
return ExtendedCommunity.unpack(
_known_community['origin4'] + pack('!LH', iga, ila), None)
if command in ('redirect', ):
ga, la = components
return ExtendedCommunity.unpack(
header + pack('!HL', int(ga), long(la)), None)
raise ValueError('invalid extended community %s' % command)
else:
raise ValueError('invalid extended community %s - lc+gc' % data)
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)
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)
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)
def _extended_community(value):
if value[:2].lower() == '0x':
if not len(value) % 2:
raise ValueError('invalid extended community %s' % value)
try:
raw = ''
for i in range(2, len(value), 2):
raw += chr(int(value[i:i + 2], 16))
except ValueError:
raise ValueError('invalid extended community %s' % value)
if len(raw) != 8:
raise ValueError('invalid extended community %s' % value)
return ExtendedCommunity.unpack(raw)
elif value.count(':'):
_known_community = {
# header and subheader
'target': chr(0x00) + chr(0x02),
'origin': chr(0x00) + chr(0x03),
'l2info': chr(0x80) + chr(0x0A),
}
_size_community = {
'target': 2,
'origin': 2,
'l2info': 4,
}
components = value.split(':')
command = 'target' if len(components) == 2 else components.pop(0)
if command not in _known_community:
raise ValueError(
'invalid extended community %s (only origin,target or l2info are supported) '
% command)
if len(components) != _size_community[command]:
raise ValueError(
'invalid extended community %s, expecting %d fields ' %
(command, len(components)))
header = _known_community[command]
if command == 'l2info':
# encaps, control, mtu, site
return ExtendedCommunity.unpack(
header + pack('!BBHH', *[int(_) for _ in components]))
if command in ('target', 'origin'):
# global admin, local admin
ga, la = components
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)]))
else:
if command == 'target':
return ExtendedCommunity.unpack(
header + pack('!HI', int(ga), int(la)))
if command == 'origin':
return ExtendedCommunity.unpack(
header + pack('!IH', int(ga), int(la)))
raise ValueError('invalid extended community %s' % command)
else:
raise ValueError('invalid extended community %s - lc+gc' % value)
