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)
