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(ordinal(_)) 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('!HI', int(ga), int(la)))
if command == 'target4':
return ExtendedCommunity.unpack(
_known_community['target4'] +
pack('!LH', int(ga[:-1]), int(la)), None)
if command == 'orgin4':
return ExtendedCommunity.unpack(
_known_community['origin4'] +
pack('!LH', int(ga[:-1]), int(la)), None)
raise ValueError('invalid extended community %s' % command)
else:
raise ValueError('invalid extended community %s - lc+gc' % value)
from exabgp.bgp.message.update.attribute.community.extended.encapsulation import Encapsulation from exabgp.bgp.message.update.attribute.community.extended.l2info import L2Info from exabgp.bgp.message.update.attribute.community.extended.origin import OriginASNIP from exabgp.bgp.message.update.attribute.community.extended.origin import OriginIPASN from exabgp.bgp.message.update.attribute.community.extended.origin import OriginASN4Number from exabgp.bgp.message.update.attribute.community.extended.rt import RouteTargetASNIP from exabgp.bgp.message.update.attribute.community.extended.rt import RouteTargetIPASN from exabgp.bgp.message.update.attribute.community.extended.rt import RouteTargetASN4Number from exabgp.bgp.message.update.attribute.community.extended.traffic import TrafficRate from exabgp.bgp.message.update.attribute.community.extended.traffic import TrafficAction from exabgp.bgp.message.update.attribute.community.extended.traffic import TrafficRedirect from exabgp.bgp.message.update.attribute.community.extended.traffic import TrafficMark from exabgp.bgp.message.update.attribute.community.extended.traffic import TrafficNextHop ExtendedCommunity.register_extended(Encapsulation) ExtendedCommunity.register_extended(L2Info) ExtendedCommunity.register_extended(OriginASNIP) ExtendedCommunity.register_extended(OriginIPASN) ExtendedCommunity.register_extended(OriginASN4Number) ExtendedCommunity.register_extended(RouteTargetASNIP) ExtendedCommunity.register_extended(RouteTargetIPASN) ExtendedCommunity.register_extended(RouteTargetASN4Number) ExtendedCommunity.register_extended(TrafficRate) ExtendedCommunity.register_extended(TrafficAction) ExtendedCommunity.register_extended(TrafficRedirect) ExtendedCommunity.register_extended(TrafficMark) ExtendedCommunity.register_extended(TrafficNextHop)