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