def unpack (data,negotiated): communities = Communities() while data: if data and len(data) < 4: raise Notify(3,1,'could not decode community %s' % str([hex(ord(_)) for _ in data])) communities.add(Community.unpack(data[:4],negotiated)) data = data[4:] return communities
def unpack (data,negotiated): communities = Communities() while data: if data and len(data) < 4: raise Notify(3,1,'could not decode community %s' % str([hex(ord(_)) for _ in data])) communities.add(Community.unpack(data[:4],negotiated)) data = data[4:] return communities
def _community(value):
separator = value.find(':')
if separator > 0:
prefix = value[:separator]
suffix = value[separator + 1:]
if not prefix.isdigit() or not suffix.isdigit():
raise ValueError('invalid community %s' % value)
prefix, suffix = int(prefix), int(suffix)
if prefix > Community.MAX:
raise ValueError('invalid community %s (prefix too large)' % value)
if suffix > Community.MAX:
raise ValueError('invalid community %s (suffix too large)' % value)
return Community(pack('!L', (prefix << 16) + suffix))
elif value[:2].lower() == '0x':
number = long(value, 16)
if number > Community.MAX:
raise ValueError('invalid community %s (too large)' % value)
return Community(pack('!L', number))
else:
low = value.lower()
if low == 'no-export':
return Community(Community.NO_EXPORT)
elif low == 'no-advertise':
return Community(Community.NO_ADVERTISE)
elif low == 'no-export-subconfed':
return Community(Community.NO_EXPORT_SUBCONFED)
# no-peer is not a correct syntax but I am sure someone will make the mistake :)
elif low == 'nopeer' or low == 'no-peer':
return Community(Community.NO_PEER)
elif low == 'blackhole':
return Community(Community.BLACKHOLE)
elif value.isdigit():
number = int(value)
if number > Community.MAX:
raise ValueError('invalid community %s (too large)' % value)
return Community(pack('!L', number))
else:
raise ValueError('invalid community name %s' % value)
def _community(value):
separator = value.find(':')
if separator > 0:
prefix = value[:separator]
suffix = value[separator + 1:]
if not prefix.isdigit() or not suffix.isdigit():
raise ValueError('invalid community %s' % value)
prefix, suffix = int(prefix), int(suffix)
# XXX: FIXME: add a Community.MAX to pow(2,16) -1
if prefix >= pow(2, 16):
raise ValueError('invalid community %s (prefix too large)' % value)
# XXX: FIXME: add a Community.MAX to pow(2,16) -1
if suffix >= pow(2, 16):
raise ValueError('invalid community %s (suffix too large)' % value)
return Community(pack('!L', (prefix << 16) + suffix))
elif value[:2].lower() == '0x':
value = long(value, 16)
# XXX: FIXME: add a Community.MAX to pow(2,16) -1
if value >= pow(2, 32):
raise ValueError('invalid community %s (too large)' % value)
return Community(pack('!L', value))
else:
low = value.lower()
if low == 'no-export':
return Community(Community.NO_EXPORT)
elif low == 'no-advertise':
return Community(Community.NO_ADVERTISE)
elif low == 'no-export-subconfed':
return Community(Community.NO_EXPORT_SUBCONFED)
# no-peer is not a correct syntax but I am sure someone will make the mistake :)
elif low == 'nopeer' or low == 'no-peer':
return Community(Community.NO_PEER)
elif value.isdigit():
value = unpack('!L', value)[0]
if value >= pow(2, 32):
raise ValueError('invalid community %s (too large)' % value)
return Community(pack('!L', value))
else:
raise ValueError('invalid community name %s' % value)
def test_1_community(self):
self.assertEqual(Community(256), 256)
@classmethod def unpack (cls,community,negotiated): return cls(community) @classmethod def cached (cls,community): if cls.caching and community in cls.cache: return cls.cache[community] instance = cls(community) if cls.caching: cls.cache[community] = instance return instance # Always cache well-known communities, they will be used a lot if not Community.cache: Community.cache[Community.NO_EXPORT] = Community(Community.NO_EXPORT) Community.cache[Community.NO_ADVERTISE] = Community(Community.NO_ADVERTISE) Community.cache[Community.NO_EXPORT_SUBCONFED] = Community(Community.NO_EXPORT_SUBCONFED) Community.cache[Community.NO_PEER] = Community(Community.NO_PEER) # ============================================================== Communities (8) # http://www.iana.org/assignments/bgp-extended-communities from exabgp.bgp.message.update.attribute.attribute import Attribute from exabgp.bgp.message.update.attribute.community import Community from exabgp.bgp.message.update.attribute.community.extended import ExtendedCommunity from exabgp.bgp.message.notification import Notify # Unused but required for the registration of the classes from exabgp.bgp.message.update.attribute.community.extended.encapsulation import Encapsulation
