circuitpython/tools/hci_trace_to_pcap.py

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#!/usr/bin/env python3
#
# This file is part of the MicroPython project, http://micropython.org/
#
# The MIT License (MIT)
#
# Copyright (c) 2023 Jim Mussared
#
# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"), to deal
# in the Software without restriction, including without limitation the rights
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice shall be included in
# all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
# THE SOFTWARE.
# Simple script to take the output printed when HCI_TRACE is enabled in
# unix/mpbthciport.c, extmod/btstack/btstack_hci_uart.c,
# extmod/nimble/hal/hal_uart.c and turn it into a .pcap file suitable for use
# with Wireshark.
import re
import sys
import struct
# pcap file header:
# typedef struct pcap_hdr_s {
# guint32 magic_number; /* magic number */
# guint16 version_major; /* major version number */
# guint16 version_minor; /* minor version number */
# gint32 thiszone; /* GMT to local correction */
# guint32 sigfigs; /* accuracy of timestamps */
# guint32 snaplen; /* max length of captured packets, in octets */
# guint32 network; /* data link type */
# } pcap_hdr_t;
# pcap record header
# typedef struct pcaprec_hdr_s {
# guint32 ts_sec; /* timestamp seconds */
# guint32 ts_usec; /* timestamp microseconds */
# guint32 incl_len; /* number of octets of packet saved in file */
# guint32 orig_len; /* actual length of packet */
# } pcaprec_hdr_t;
_LINKTYPE_BLUETOOTH_HCI_H4_WITH_PHDR = 201 # "!I" direction, followed by data
sys.stdout.buffer.write(
struct.pack("!IHHiIII", 0xA1B2C3D4, 2, 4, 0, 0, 65535, _LINKTYPE_BLUETOOTH_HCI_H4_WITH_PHDR)
)
_DIR_CONTROLLER_TO_HOST = 1
_DIR_HOST_TO_CONTROLLER = 0
reassemble_timestamp = 0
reassemble_packet = bytearray()
with open(sys.argv[1], "r") as f:
for line in f:
line = line.strip()
m = re.match("([<>]) \\[ *([0-9]+)\\] ([A-Fa-f0-9:]+)", line)
if not m:
continue
timestamp = int(m.group(2))
data = bytes.fromhex(m.group(3).replace(":", ""))
if m.group(1) == "<":
# Host to controller.
# These are always complete.
sys.stdout.buffer.write(
struct.pack(
"!IIIII",
timestamp // 1000,
timestamp % 1000 * 1000,
len(data) + 4,
len(data) + 4,
_DIR_HOST_TO_CONTROLLER,
)
)
sys.stdout.buffer.write(data)
if m.group(1) == ">":
# Controller to host.
# Several of the sources print byte-at-a-time so need to reconstruct packets.
if not reassemble_packet:
# Use the timestamp of the first fragment.
reassemble_timestamp = timestamp
reassemble_packet.extend(data)
if len(reassemble_packet) > 4:
plen = 0
if reassemble_packet[0] == 1:
# command
plen = 3 + reassemble_packet[3]
elif reassemble_packet[0] == 2:
# acl
plen = 5 + reassemble_packet[3] + (reassemble_packet[4] << 8)
elif reassemble_packet[0] == 4:
# event
plen = 3 + reassemble_packet[2]
if len(reassemble_packet) >= plen:
# Got a complete packet.
data = reassemble_packet[0:plen]
reassemble_packet = reassemble_packet[plen:]
reassemble_timestamp = timestamp
sys.stdout.buffer.write(
struct.pack(
"!IIIII",
reassemble_timestamp // 1000,
reassemble_timestamp % 1000 * 1000,
len(data) + 4,
len(data) + 4,
_DIR_CONTROLLER_TO_HOST,
)
)
sys.stdout.buffer.write(data)
if reassemble_packet:
print(
"Error: Unknown byte in HCI stream. Remainder:",
reassemble_packet.hex(":"),
file=sys.stderr,
)