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authorDiego Elio Pettenò <flameeyes@flameeyes.com>2020-01-24 15:41:19 +0100
committerDiego Elio Pettenò <flameeyes@flameeyes.com>2020-01-24 15:41:19 +0100
commit3d283209fb1825adea967f612e4b69478b574545 (patch)
treebe95f0937a75906a7b6114e2415d281fbb1e066e /reversing_tools/abbott
parentAdd a tool to extract a FreeStyle protocol chatter from an usbmon capture. (diff)
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Diffstat (limited to 'reversing_tools/abbott')
-rwxr-xr-xreversing_tools/abbott/extract_freestyle.py28
1 files changed, 16 insertions, 12 deletions
diff --git a/reversing_tools/abbott/extract_freestyle.py b/reversing_tools/abbott/extract_freestyle.py
index 019b23b..39c52ad 100755
--- a/reversing_tools/abbott/extract_freestyle.py
+++ b/reversing_tools/abbott/extract_freestyle.py
@@ -25,10 +25,8 @@ import usbmon
import usbmon.chatter
import usbmon.pcapng
-HID_XFER_TYPES = (
- usbmon.constants.XferType.INTERRUPT,
- usbmon.constants.XferType.CONTROL,
-)
+_UNENCRYPTED_TYPES = (
+ 0x01, 0x04, 0x05, 0x06, 0x0c, 0x0d, 0x14, 0x15, 0x33, 0x34, 0x35, 0x71,)
def main():
if sys.version_info < (3, 7):
@@ -49,6 +47,12 @@ def main():
'https://docs.python.org/3/library/logging.html#logging-levels'))
parser.add_argument(
+ '--libre2', action='store_true',
+ help=('Whether to expect the capture coming from a Libre 2 device. '
+ 'Libre 2 devices encrypt some of the messages, and as such they '
+ 'will be dumped with the undecoded length as well.'))
+
+ parser.add_argument(
'pcap_file', action='store', type=str,
help='Path to the pcapng file with the USB capture.')
@@ -85,16 +89,16 @@ def main():
assert len(packet.payload) >= 2
- message_length = packet.payload[1]
+ message_type = packet.payload[0]
- # This is the case on Libre 2 (expected encrypted communication), in
- # which case we ignore the message_length and we keep the whole message
- # together.
- if message_length > 62:
- message_type = 'xx'
- message = packet.payload
+ if args.libre2 and message_type not in _UNENCRYPTED_TYPES:
+ # On Libre 2 (expected encrypted communication), we ignore the
+ # message_length and we keep it with the whole message.
+ message_type = f'x{message_type:02x}'
+ message = packet.payload[1:]
else:
- message_type = f'{packet.payload[0]:02x}'
+ message_length = packet.payload[1]
+ message_type = f' {message_type:02x}'
message = packet.payload[2:2+message_length]
print(usbmon.chatter.dump_bytes(