def from_bytes(cls, bitstream):
"""
Parse the given record and update properties accordingly
"""
record = cls()
# Convert to ConstBitStream (if not already provided)
if not isinstance(bitstream, ConstBitStream):
if isinstance(bitstream, Bits):
bitstream = ConstBitStream(auto=bitstream)
else:
bitstream = ConstBitStream(bytes=bitstream)
# Read the record TTL
record.ttl = bitstream.read("uint:32")
# Store the locator record count until we need it
referral_count = bitstream.read("uint:8")
# Store the EID prefix mask length until we need it
eid_prefix_len = bitstream.read("uint:8")
# Read the Negative Map_Reply action
record.action = bitstream.read("uint:3")
# Read the flags
(record.authoritative, record.incomplete) = bitstream.readlist("2*bool")
# Read reserved bits
record._reserved1 = bitstream.read(11)
# Read the signature count
sig_count = bitstream.read("uint:4")
# Read the map version
record.map_version = bitstream.read("uint:12")
# Read the EID prefix
record.eid_prefix = read_afi_address_from_bitstream(bitstream, eid_prefix_len)
# Read the locator records
for dummy in range(referral_count):
locator_record = LocatorRecord.from_bytes(bitstream)
record.locator_records.append(locator_record)
# TODO: Can't handle signatures yet! [LISP-Security]
if sig_count:
raise NotImplementedError("Cannot handle signatures yet")
# Verify that the properties make sense
record.sanitize()
return record
def from_bytes(cls, bitstream):
'''
Parse the given record and update properties accordingly
'''
record = cls()
# Convert to ConstBitStream (if not already provided)
if not isinstance(bitstream, ConstBitStream):
if isinstance(bitstream, Bits):
bitstream = ConstBitStream(auto=bitstream)
else:
bitstream = ConstBitStream(bytes=bitstream)
# Read the record TTL
record.ttl = bitstream.read('uint:32')
# Store the locator record count until we need it
locator_record_count = bitstream.read('uint:8')
# Store the EID prefix mask length until we need it
eid_prefix_len = bitstream.read('uint:8')
# Read the Negative Map_Reply action
record.action = bitstream.read('uint:3')
# Read the flag
record.authoritative = bitstream.read('bool')
# Read reserved bits
record._reserved1 = bitstream.read(12 + 4)
# Read the map version
record.map_version = bitstream.read('uint:12')
# Read the EID prefix
record.eid_prefix = read_afi_address_from_bitstream(bitstream,
eid_prefix_len)
# Read the locator records
for dummy in range(locator_record_count):
locator_record = LocatorRecord.from_bytes(bitstream)
record.locator_records.append(locator_record)
# Verify that the properties make sense
record.sanitize()
return record
