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"""Test the Thread TLV parser."""
import pytest
from python_otbr_api.tlv_parser import (
Timestamp,
Channel,
MeshcopTLVItem,
MeshcopTLVType,
NetworkName,
TLVError,
encode_tlv,
parse_tlv,
)
def test_encode_tlv() -> None:
"""Test the TLV parser."""
dataset = {
MeshcopTLVType.ACTIVETIMESTAMP: MeshcopTLVItem(
MeshcopTLVType.ACTIVETIMESTAMP, bytes.fromhex("0000000000010000")
),
MeshcopTLVType.CHANNEL: MeshcopTLVItem(
MeshcopTLVType.CHANNEL, bytes.fromhex("00000f")
),
MeshcopTLVType.CHANNELMASK: MeshcopTLVItem(
MeshcopTLVType.CHANNELMASK, bytes.fromhex("0004001fffe0")
),
MeshcopTLVType.EXTPANID: MeshcopTLVItem(
MeshcopTLVType.EXTPANID, bytes.fromhex("1111111122222222")
),
MeshcopTLVType.MESHLOCALPREFIX: MeshcopTLVItem(
MeshcopTLVType.MESHLOCALPREFIX, bytes.fromhex("fdad70bfe5aa15dd")
),
MeshcopTLVType.NETWORKKEY: MeshcopTLVItem(
MeshcopTLVType.NETWORKKEY, bytes.fromhex("00112233445566778899aabbccddeeff")
),
MeshcopTLVType.NETWORKNAME: NetworkName(
MeshcopTLVType.NETWORKNAME, "OpenThreadDemo".encode()
),
MeshcopTLVType.PANID: MeshcopTLVItem(
MeshcopTLVType.PANID, bytes.fromhex("1234")
),
MeshcopTLVType.PSKC: MeshcopTLVItem(
MeshcopTLVType.PSKC, bytes.fromhex("445f2b5ca6f2a93a55ce570a70efeecb")
),
MeshcopTLVType.SECURITYPOLICY: MeshcopTLVItem(
MeshcopTLVType.SECURITYPOLICY, bytes.fromhex("02a0f7f8")
),
}
dataset_tlv = encode_tlv(dataset)
assert (
dataset_tlv
== (
"0E080000000000010000000300000F35060004001FFFE0020811111111222222220708FDAD"
"70BFE5AA15DD051000112233445566778899AABBCCDDEEFF030E4F70656E54687265616444"
"656D6F010212340410445F2B5CA6F2A93A55CE570A70EFEECB0C0402A0F7F8"
).lower()
)
def test_parse_tlv() -> None:
"""Test the TLV parser."""
dataset_tlv = (
"0E080000000000010000000300000F35060004001FFFE0020811111111222222220708FDAD70BF"
"E5AA15DD051000112233445566778899AABBCCDDEEFF030E4F70656E54687265616444656D6F01"
"0212340410445F2B5CA6F2A93A55CE570A70EFEECB0C0402A0F7F8"
)
dataset = parse_tlv(dataset_tlv)
assert dataset == {
MeshcopTLVType.CHANNEL: Channel(
MeshcopTLVType.CHANNEL, bytes.fromhex("00000f")
),
MeshcopTLVType.PANID: MeshcopTLVItem(
MeshcopTLVType.PANID, bytes.fromhex("1234")
),
MeshcopTLVType.EXTPANID: MeshcopTLVItem(
MeshcopTLVType.EXTPANID, bytes.fromhex("1111111122222222")
),
MeshcopTLVType.NETWORKNAME: NetworkName(
MeshcopTLVType.NETWORKNAME, "OpenThreadDemo".encode()
),
MeshcopTLVType.PSKC: MeshcopTLVItem(
MeshcopTLVType.PSKC, bytes.fromhex("445f2b5ca6f2a93a55ce570a70efeecb")
),
MeshcopTLVType.NETWORKKEY: MeshcopTLVItem(
MeshcopTLVType.NETWORKKEY, bytes.fromhex("00112233445566778899aabbccddeeff")
),
MeshcopTLVType.MESHLOCALPREFIX: MeshcopTLVItem(
MeshcopTLVType.MESHLOCALPREFIX, bytes.fromhex("fdad70bfe5aa15dd")
),
MeshcopTLVType.SECURITYPOLICY: MeshcopTLVItem(
MeshcopTLVType.SECURITYPOLICY, bytes.fromhex("02a0f7f8")
),
MeshcopTLVType.ACTIVETIMESTAMP: Timestamp(
MeshcopTLVType.ACTIVETIMESTAMP, bytes.fromhex("0000000000010000")
),
MeshcopTLVType.CHANNELMASK: MeshcopTLVItem(
MeshcopTLVType.CHANNELMASK, bytes.fromhex("0004001fffe0")
),
}
def test_parse_tlv_apple() -> None:
"""Test the TLV parser from a (truncated) dataset from an Apple BR."""
dataset_tlv = (
"0e08000065901a07000000030000194a0300000f35060004001fffc003104d79486f6d65313233"
"31323331323334"
)
dataset = parse_tlv(dataset_tlv)
assert dataset == {
MeshcopTLVType.ACTIVETIMESTAMP: Timestamp(
MeshcopTLVType.ACTIVETIMESTAMP, bytes.fromhex("000065901a070000")
),
MeshcopTLVType.CHANNEL: Channel(
MeshcopTLVType.CHANNEL, bytes.fromhex("000019")
),
MeshcopTLVType.APPLE_TAG_UNKNOWN: MeshcopTLVItem(
MeshcopTLVType.APPLE_TAG_UNKNOWN, bytes.fromhex("00000f")
),
MeshcopTLVType.CHANNELMASK: MeshcopTLVItem(
MeshcopTLVType.CHANNELMASK, bytes.fromhex("0004001fffc0")
),
MeshcopTLVType.NETWORKNAME: NetworkName(
MeshcopTLVType.NETWORKNAME, "MyHome1231231234".encode()
),
}
@pytest.mark.parametrize(
"tlv, error, msg",
(
(
"killevippen",
TLVError,
"invalid tlvs",
),
(
"FF",
TLVError,
"unknown type 255",
),
(
"030E4F70656E54687265616444656D",
TLVError,
"expected 14 bytes for NETWORKNAME, got 13",
),
(
"030E4F70656E54687265616444656DFF",
TLVError,
"invalid network name '4f70656e54687265616444656dff'",
),
),
)
def test_parse_tlv_error(tlv, error, msg) -> None:
"""Test the TLV parser error handling."""
with pytest.raises(error, match=msg):
parse_tlv(tlv)
def test_timestamp_parsing_full_integrity() -> None:
"""
Test parsing of a timestamp with mixed values for seconds, ticks, and authoritative.
We construct a value to ensure no bit overlap:
- Seconds: 400 (0x190)
- Ticks: 32767 (0x7FFF, Max value to catch the masking bug)
- Authoritative: True (1)
Hex Construction:
- Seconds (48 bits): 00 00 00 00 01 90
- Ticks/Auth (16 bits):
(Ticks << 1) | Auth
(0x7FFF << 1) | 1 => 0xFFFE | 1 => 0xFFFF
Combined Hex: 000000000190FFFF
"""
timestamp_data = bytes.fromhex("000000000190FFFF")
timestamp = Timestamp(MeshcopTLVType.ACTIVETIMESTAMP, timestamp_data)
# 1. Check Seconds: Ensures the upper 48 bits are shifted correctly
assert timestamp.seconds == 400
# 2. Check Ticks: Ensures the mask is 0x7FFF (32767)
assert timestamp.ticks == 32767
# 3. Check Authoritative: Ensures the lowest bit is read correctly
assert timestamp.authoritative is True
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