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test_packet.py
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test_packet.py
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import binascii
from unittest import TestCase
from aioquic.buffer import Buffer, BufferReadError
from aioquic.quic import packet
from aioquic.quic.packet import (
QuicPacketType,
QuicPreferredAddress,
QuicProtocolVersion,
QuicTransportParameters,
QuicVersionInformation,
decode_packet_number,
encode_quic_retry,
encode_quic_version_negotiation,
get_retry_integrity_tag,
pull_quic_header,
pull_quic_preferred_address,
pull_quic_transport_parameters,
push_quic_preferred_address,
push_quic_transport_parameters,
)
from .test_crypto_v1 import LONG_CLIENT_ENCRYPTED_PACKET as CLIENT_INITIAL_V1
from .test_crypto_v1 import LONG_SERVER_ENCRYPTED_PACKET as SERVER_INITIAL_V1
from .test_crypto_v2 import LONG_CLIENT_ENCRYPTED_PACKET as CLIENT_INITIAL_V2
from .test_crypto_v2 import LONG_SERVER_ENCRYPTED_PACKET as SERVER_INITIAL_V2
class PacketTest(TestCase):
def test_decode_packet_number(self):
# expected = 0
for i in range(0, 256):
self.assertEqual(decode_packet_number(i, 8, expected=0), i)
# expected = 128
self.assertEqual(decode_packet_number(0, 8, expected=128), 256)
for i in range(1, 256):
self.assertEqual(decode_packet_number(i, 8, expected=128), i)
# expected = 129
self.assertEqual(decode_packet_number(0, 8, expected=129), 256)
self.assertEqual(decode_packet_number(1, 8, expected=129), 257)
for i in range(2, 256):
self.assertEqual(decode_packet_number(i, 8, expected=129), i)
# expected = 256
for i in range(0, 128):
self.assertEqual(decode_packet_number(i, 8, expected=256), 256 + i)
for i in range(129, 256):
self.assertEqual(decode_packet_number(i, 8, expected=256), i)
def test_pull_empty(self):
buf = Buffer(data=b"")
with self.assertRaises(BufferReadError):
pull_quic_header(buf, host_cid_length=8)
def test_pull_initial_client_v1(self):
buf = Buffer(data=CLIENT_INITIAL_V1)
header = pull_quic_header(buf, host_cid_length=8)
self.assertEqual(header.version, QuicProtocolVersion.VERSION_1)
self.assertEqual(header.packet_type, QuicPacketType.INITIAL)
self.assertEqual(header.packet_length, 1200)
self.assertEqual(header.destination_cid, binascii.unhexlify("8394c8f03e515708"))
self.assertEqual(header.source_cid, b"")
self.assertEqual(header.token, b"")
self.assertEqual(header.integrity_tag, b"")
self.assertEqual(buf.tell(), 18)
def test_pull_initial_client_v1_truncated(self):
buf = Buffer(data=CLIENT_INITIAL_V1[0:100])
with self.assertRaises(ValueError) as cm:
pull_quic_header(buf, host_cid_length=8)
self.assertEqual(str(cm.exception), "Packet payload is truncated")
def test_pull_initial_client_v2(self):
buf = Buffer(data=CLIENT_INITIAL_V2)
header = pull_quic_header(buf, host_cid_length=8)
self.assertEqual(header.version, QuicProtocolVersion.VERSION_2)
self.assertEqual(header.packet_type, QuicPacketType.INITIAL)
self.assertEqual(header.packet_length, 1200)
self.assertEqual(header.destination_cid, binascii.unhexlify("8394c8f03e515708"))
self.assertEqual(header.source_cid, b"")
self.assertEqual(header.token, b"")
self.assertEqual(header.integrity_tag, b"")
self.assertEqual(buf.tell(), 18)
def test_pull_initial_server_v1(self):
buf = Buffer(data=SERVER_INITIAL_V1)
header = pull_quic_header(buf, host_cid_length=8)
self.assertEqual(header.version, QuicProtocolVersion.VERSION_1)
self.assertEqual(header.packet_type, QuicPacketType.INITIAL)
self.assertEqual(header.packet_length, 135)
self.assertEqual(header.destination_cid, b"")
self.assertEqual(header.source_cid, binascii.unhexlify("f067a5502a4262b5"))
self.assertEqual(header.token, b"")
self.assertEqual(header.integrity_tag, b"")
self.assertEqual(buf.tell(), 18)
def test_pull_initial_server_v2(self):
buf = Buffer(data=SERVER_INITIAL_V2)
header = pull_quic_header(buf, host_cid_length=8)
self.assertEqual(header.version, QuicProtocolVersion.VERSION_2)
self.assertEqual(header.packet_type, QuicPacketType.INITIAL)
self.assertEqual(header.packet_length, 135)
self.assertEqual(header.destination_cid, b"")
self.assertEqual(header.source_cid, binascii.unhexlify("f067a5502a4262b5"))
self.assertEqual(header.token, b"")
self.assertEqual(header.integrity_tag, b"")
self.assertEqual(buf.tell(), 18)
def test_pull_retry_v1(self):
# https://datatracker.ietf.org/doc/html/rfc9001#appendix-A.4
original_destination_cid = binascii.unhexlify("8394c8f03e515708")
data = binascii.unhexlify(
"ff000000010008f067a5502a4262b5746f6b656e04a265ba2eff4d829058fb3f0f2496ba"
)
buf = Buffer(data=data)
header = pull_quic_header(buf)
self.assertEqual(header.version, QuicProtocolVersion.VERSION_1)
self.assertEqual(header.packet_type, QuicPacketType.RETRY)
self.assertEqual(header.packet_length, 36)
self.assertEqual(header.destination_cid, b"")
self.assertEqual(header.source_cid, binascii.unhexlify("f067a5502a4262b5"))
self.assertEqual(header.token, b"token")
self.assertEqual(
header.integrity_tag, binascii.unhexlify("04a265ba2eff4d829058fb3f0f2496ba")
)
self.assertEqual(buf.tell(), 36)
# check integrity
self.assertEqual(
get_retry_integrity_tag(
buf.data_slice(0, 20), original_destination_cid, version=header.version
),
header.integrity_tag,
)
# serialize
encoded = encode_quic_retry(
version=header.version,
source_cid=header.source_cid,
destination_cid=header.destination_cid,
original_destination_cid=original_destination_cid,
retry_token=header.token,
# This value is arbitrary, we set it to match the value in the RFC.
unused=0xF,
)
self.assertEqual(encoded, data)
def test_pull_retry_v2(self):
# https://datatracker.ietf.org/doc/html/rfc9369#appendix-A.4
original_destination_cid = binascii.unhexlify("8394c8f03e515708")
data = binascii.unhexlify(
"cf6b3343cf0008f067a5502a4262b5746f6b656ec8646ce8bfe33952d955543665dcc7b6"
)
buf = Buffer(data=data)
header = pull_quic_header(buf)
self.assertEqual(header.version, QuicProtocolVersion.VERSION_2)
self.assertEqual(header.packet_type, QuicPacketType.RETRY)
self.assertEqual(header.packet_length, 36)
self.assertEqual(header.destination_cid, b"")
self.assertEqual(header.source_cid, binascii.unhexlify("f067a5502a4262b5"))
self.assertEqual(header.token, b"token")
self.assertEqual(
header.integrity_tag, binascii.unhexlify("c8646ce8bfe33952d955543665dcc7b6")
)
self.assertEqual(buf.tell(), 36)
# check integrity
self.assertEqual(
get_retry_integrity_tag(
buf.data_slice(0, 20), original_destination_cid, version=header.version
),
header.integrity_tag,
)
# serialize
encoded = encode_quic_retry(
version=header.version,
source_cid=header.source_cid,
destination_cid=header.destination_cid,
original_destination_cid=original_destination_cid,
retry_token=header.token,
# This value is arbitrary, we set it to match the value in the RFC.
unused=0xF,
)
self.assertEqual(encoded, data)
def test_pull_version_negotiation(self):
data = binascii.unhexlify(
"ea00000000089aac5a49ba87a84908f92f4336fa951ba14547471600000001"
)
buf = Buffer(data=data)
header = pull_quic_header(buf, host_cid_length=8)
self.assertEqual(header.version, QuicProtocolVersion.NEGOTIATION)
self.assertEqual(header.packet_type, QuicPacketType.VERSION_NEGOTIATION)
self.assertEqual(header.packet_length, 31)
self.assertEqual(header.destination_cid, binascii.unhexlify("9aac5a49ba87a849"))
self.assertEqual(header.source_cid, binascii.unhexlify("f92f4336fa951ba1"))
self.assertEqual(header.token, b"")
self.assertEqual(header.integrity_tag, b"")
self.assertEqual(
header.supported_versions, [0x45474716, QuicProtocolVersion.VERSION_1]
)
self.assertEqual(buf.tell(), 31)
encoded = encode_quic_version_negotiation(
destination_cid=header.destination_cid,
source_cid=header.source_cid,
supported_versions=header.supported_versions,
)
# The first byte may differ as it is random.
self.assertEqual(encoded[1:], data[1:])
def test_pull_long_header_dcid_too_long(self):
buf = Buffer(
data=binascii.unhexlify(
"c6ff0000161500000000000000000000000000000000000000000000004"
"01c514f99ec4bbf1f7a30f9b0c94fef717f1c1d07fec24c99a864da7ede"
)
)
with self.assertRaises(ValueError) as cm:
pull_quic_header(buf, host_cid_length=8)
self.assertEqual(str(cm.exception), "Destination CID is too long (21 bytes)")
def test_pull_long_header_scid_too_long(self):
buf = Buffer(
data=binascii.unhexlify(
"c2ff0000160015000000000000000000000000000000000000000000004"
"01cfcee99ec4bbf1f7a30f9b0c9417b8c263cdd8cc972a4439d68a46320"
)
)
with self.assertRaises(ValueError) as cm:
pull_quic_header(buf, host_cid_length=8)
self.assertEqual(str(cm.exception), "Source CID is too long (21 bytes)")
def test_pull_long_header_no_fixed_bit(self):
buf = Buffer(data=b"\x80\xff\x00\x00\x11\x00\x00")
with self.assertRaises(ValueError) as cm:
pull_quic_header(buf, host_cid_length=8)
self.assertEqual(str(cm.exception), "Packet fixed bit is zero")
def test_pull_long_header_too_short(self):
buf = Buffer(data=b"\xc0\x00")
with self.assertRaises(BufferReadError):
pull_quic_header(buf, host_cid_length=8)
def test_pull_short_header(self):
buf = Buffer(
data=binascii.unhexlify("5df45aa7b59c0e1ad6e668f5304cd4fd1fb3799327")
)
header = pull_quic_header(buf, host_cid_length=8)
self.assertEqual(header.version, None)
self.assertEqual(header.packet_type, QuicPacketType.ONE_RTT)
self.assertEqual(header.packet_length, 21)
self.assertEqual(header.destination_cid, binascii.unhexlify("f45aa7b59c0e1ad6"))
self.assertEqual(header.source_cid, b"")
self.assertEqual(header.token, b"")
self.assertEqual(header.integrity_tag, b"")
self.assertEqual(buf.tell(), 9)
def test_pull_short_header_no_fixed_bit(self):
buf = Buffer(data=b"\x00")
with self.assertRaises(ValueError) as cm:
pull_quic_header(buf, host_cid_length=8)
self.assertEqual(str(cm.exception), "Packet fixed bit is zero")
class ParamsTest(TestCase):
maxDiff = None
def test_params(self):
data = binascii.unhexlify(
"010267100210cc2fd6e7d97a53ab5be85b28d75c8008030247e404048005fff"
"a05048000ffff06048000ffff0801060a01030b0119"
)
# parse
buf = Buffer(data=data)
params = pull_quic_transport_parameters(buf)
self.assertEqual(
params,
QuicTransportParameters(
max_idle_timeout=10000,
stateless_reset_token=b"\xcc/\xd6\xe7\xd9zS\xab[\xe8[(\xd7\\\x80\x08",
max_udp_payload_size=2020,
initial_max_data=393210,
initial_max_stream_data_bidi_local=65535,
initial_max_stream_data_bidi_remote=65535,
initial_max_stream_data_uni=None,
initial_max_streams_bidi=6,
initial_max_streams_uni=None,
ack_delay_exponent=3,
max_ack_delay=25,
),
)
# serialize
buf = Buffer(capacity=len(data))
push_quic_transport_parameters(buf, params)
self.assertEqual(len(buf.data), len(data))
def test_params_disable_active_migration(self):
data = binascii.unhexlify("0c00")
# parse
buf = Buffer(data=data)
params = pull_quic_transport_parameters(buf)
self.assertEqual(params, QuicTransportParameters(disable_active_migration=True))
# serialize
buf = Buffer(capacity=len(data))
push_quic_transport_parameters(buf, params)
self.assertEqual(buf.data, data)
def test_params_max_ack_delay(self):
data = binascii.unhexlify("0b010a")
# parse
buf = Buffer(data=data)
params = pull_quic_transport_parameters(buf)
self.assertEqual(params, QuicTransportParameters(max_ack_delay=10))
# serialize
buf = Buffer(capacity=len(data))
push_quic_transport_parameters(buf, params)
self.assertEqual(buf.data, data)
def test_params_max_ack_delay_length_mismatch(self):
buf = Buffer(data=binascii.unhexlify("0b020a"))
with self.assertRaises(ValueError) as cm:
pull_quic_transport_parameters(buf)
self.assertEqual(str(cm.exception), "Transport parameter length does not match")
def test_params_preferred_address(self):
data = binascii.unhexlify(
"0d3b8ba27b8611532400890200000000f03c91fffe69a45411531262c4518d6"
"3013f0c287ed3573efa9095603746b2e02d45480ba6643e5c6e7d48ecb4"
)
# parse
buf = Buffer(data=data)
params = pull_quic_transport_parameters(buf)
self.assertEqual(
params,
QuicTransportParameters(
preferred_address=QuicPreferredAddress(
ipv4_address=("139.162.123.134", 4435),
ipv6_address=("2400:8902::f03c:91ff:fe69:a454", 4435),
connection_id=b"b\xc4Q\x8dc\x01?\x0c(~\xd3W>\xfa\x90\x95`7",
stateless_reset_token=b"F\xb2\xe0-EH\x0b\xa6d>\\n}H\xec\xb4",
),
),
)
# serialize
buf = Buffer(capacity=len(data))
push_quic_transport_parameters(buf, params)
self.assertEqual(buf.data, data)
def test_params_unknown(self):
data = binascii.unhexlify("8000ff000100")
# parse
buf = Buffer(data=data)
params = pull_quic_transport_parameters(buf)
self.assertEqual(params, QuicTransportParameters())
def test_params_version_information(self):
data = binascii.unhexlify("110c00000001000000016b3343cf")
# parse
buf = Buffer(data=data)
params = pull_quic_transport_parameters(buf)
self.assertEqual(
params,
QuicTransportParameters(
version_information=QuicVersionInformation(
chosen_version=QuicProtocolVersion.VERSION_1,
available_versions=[
QuicProtocolVersion.VERSION_1,
QuicProtocolVersion.VERSION_2,
],
),
),
)
# serialize
buf = Buffer(capacity=len(data))
push_quic_transport_parameters(buf, params)
self.assertEqual(buf.data, data)
def test_params_version_information_available_version_0(self):
buf = Buffer(data=binascii.unhexlify("11080000000100000000"))
with self.assertRaises(ValueError) as cm:
pull_quic_transport_parameters(buf)
self.assertEqual(
str(cm.exception), "Version Information must not contain version 0"
)
def test_params_version_information_chosen_version_0(self):
buf = Buffer(data=binascii.unhexlify("110400000000"))
with self.assertRaises(ValueError) as cm:
pull_quic_transport_parameters(buf)
self.assertEqual(
str(cm.exception), "Version Information must not contain version 0"
)
def test_params_version_information_length_not_divisible_by_four(self):
buf = Buffer(data=binascii.unhexlify("11050000000100"))
with self.assertRaises(ValueError) as cm:
pull_quic_transport_parameters(buf)
self.assertEqual(str(cm.exception), "Transport parameter length does not match")
def test_params_version_information_truncated(self):
buf = Buffer(data=binascii.unhexlify("110800000000"))
with self.assertRaises(ValueError) as cm:
pull_quic_transport_parameters(buf)
self.assertEqual(str(cm.exception), "Read out of bounds")
def test_preferred_address_ipv4_only(self):
data = binascii.unhexlify(
"8ba27b8611530000000000000000000000000000000000001262c4518d63013"
"f0c287ed3573efa9095603746b2e02d45480ba6643e5c6e7d48ecb4"
)
# parse
buf = Buffer(data=data)
preferred_address = pull_quic_preferred_address(buf)
self.assertEqual(
preferred_address,
QuicPreferredAddress(
ipv4_address=("139.162.123.134", 4435),
ipv6_address=None,
connection_id=b"b\xc4Q\x8dc\x01?\x0c(~\xd3W>\xfa\x90\x95`7",
stateless_reset_token=b"F\xb2\xe0-EH\x0b\xa6d>\\n}H\xec\xb4",
),
)
# serialize
buf = Buffer(capacity=len(data))
push_quic_preferred_address(buf, preferred_address)
self.assertEqual(buf.data, data)
def test_preferred_address_ipv6_only(self):
data = binascii.unhexlify(
"0000000000002400890200000000f03c91fffe69a45411531262c4518d63013"
"f0c287ed3573efa9095603746b2e02d45480ba6643e5c6e7d48ecb4"
)
# parse
buf = Buffer(data=data)
preferred_address = pull_quic_preferred_address(buf)
self.assertEqual(
preferred_address,
QuicPreferredAddress(
ipv4_address=None,
ipv6_address=("2400:8902::f03c:91ff:fe69:a454", 4435),
connection_id=b"b\xc4Q\x8dc\x01?\x0c(~\xd3W>\xfa\x90\x95`7",
stateless_reset_token=b"F\xb2\xe0-EH\x0b\xa6d>\\n}H\xec\xb4",
),
)
# serialize
buf = Buffer(capacity=len(data))
push_quic_preferred_address(buf, preferred_address)
self.assertEqual(buf.data, data)
class FrameTest(TestCase):
def test_ack_frame(self):
data = b"\x00\x02\x00\x00"
# parse
buf = Buffer(data=data)
rangeset, delay = packet.pull_ack_frame(buf)
self.assertEqual(list(rangeset), [range(0, 1)])
self.assertEqual(delay, 2)
# serialize
buf = Buffer(capacity=len(data))
packet.push_ack_frame(buf, rangeset, delay)
self.assertEqual(buf.data, data)
def test_ack_frame_with_one_range(self):
data = b"\x02\x02\x01\x00\x00\x00"
# parse
buf = Buffer(data=data)
rangeset, delay = packet.pull_ack_frame(buf)
self.assertEqual(list(rangeset), [range(0, 1), range(2, 3)])
self.assertEqual(delay, 2)
# serialize
buf = Buffer(capacity=len(data))
packet.push_ack_frame(buf, rangeset, delay)
self.assertEqual(buf.data, data)
def test_ack_frame_with_one_range_2(self):
data = b"\x05\x02\x01\x00\x00\x03"
# parse
buf = Buffer(data=data)
rangeset, delay = packet.pull_ack_frame(buf)
self.assertEqual(list(rangeset), [range(0, 4), range(5, 6)])
self.assertEqual(delay, 2)
# serialize
buf = Buffer(capacity=len(data))
packet.push_ack_frame(buf, rangeset, delay)
self.assertEqual(buf.data, data)
def test_ack_frame_with_one_range_3(self):
data = b"\x05\x02\x01\x00\x01\x02"
# parse
buf = Buffer(data=data)
rangeset, delay = packet.pull_ack_frame(buf)
self.assertEqual(list(rangeset), [range(0, 3), range(5, 6)])
self.assertEqual(delay, 2)
# serialize
buf = Buffer(capacity=len(data))
packet.push_ack_frame(buf, rangeset, delay)
self.assertEqual(buf.data, data)
def test_ack_frame_with_two_ranges(self):
data = b"\x04\x02\x02\x00\x00\x00\x00\x00"
# parse
buf = Buffer(data=data)
rangeset, delay = packet.pull_ack_frame(buf)
self.assertEqual(list(rangeset), [range(0, 1), range(2, 3), range(4, 5)])
self.assertEqual(delay, 2)
# serialize
buf = Buffer(capacity=len(data))
packet.push_ack_frame(buf, rangeset, delay)
self.assertEqual(buf.data, data)