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Add tool to recalculate PCAP frame checksums #1

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Merged
puddly merged 1 commit into from
Jul 22, 2021
Merged

Add tool to recalculate PCAP frame checksums #1

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10 changes: 10 additions & 0 deletions README.md
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Original file line number Diff line number Diff line change
Expand Up @@ -85,3 +85,13 @@ $ zigpy ota dump-firmware 10047227-1.2-TRADFRI-cv-cct-unified-2.3.050.ota.ota.si
| grep 'Ember Version'
Ember Version: 6.3.1.1
```


# PCAP
Re-calculate the FCS on a packet capture due to a bug in current EmberZNet SDK releases:
```console
$ # Fix an existing capture
$ zigpy pcap fix-fcs input.pcap fixed.pcap
$ # Fix a capture from stdin and send it to stdout
$ bellows -d /dev/cu.GoControl_zigbee dump -w /dev/stdout | zigpy pcap fix-fcs - - | wireshark -k -S -i -
```
1 change: 1 addition & 0 deletions setup.py
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Expand Up @@ -21,6 +21,7 @@
"zigpy",
"click",
"coloredlogs",
"scapy",
],
extras_require={
# [all] pulls in all radio libraries
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1 change: 1 addition & 0 deletions zigpy_cli/__main__.py
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@@ -1,3 +1,4 @@
import zigpy_cli.ota # noqa: F401
import zigpy_cli.pcap # noqa: F401
import zigpy_cli.radio # noqa: F401
from zigpy_cli.cli import cli # noqa: F401
31 changes: 31 additions & 0 deletions zigpy_cli/pcap.py
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@@ -0,0 +1,31 @@
from __future__ import annotations

import logging

import click
from scapy.utils import PcapReader, PcapWriter
from scapy.config import conf as scapy_conf
from scapy.layers.dot15d4 import Dot15d4 # NOQA: F401

from zigpy_cli.cli import cli

scapy_conf.dot15d4_protocol = "zigbee"

LOGGER = logging.getLogger(__name__)


@cli.group()
def pcap():
pass


@pcap.command()
@click.argument("input", type=click.File("rb"))
@click.argument("output", type=click.File("wb"))
def fix_fcs(input, output):
reader = PcapReader(input.raw)
writer = PcapWriter(output.raw)

for packet in reader:
packet.fcs = None
writer.write(packet)