mirror of
https://github.com/trezor/trezor-firmware.git
synced 2024-11-30 11:28:21 +00:00
119 lines
3.4 KiB
Python
119 lines
3.4 KiB
Python
# This file is part of the TREZOR project.
|
|
#
|
|
# Copyright (C) 2012-2016 Marek Palatinus <slush@satoshilabs.com>
|
|
# Copyright (C) 2012-2016 Pavol Rusnak <stick@satoshilabs.com>
|
|
# Copyright (C) 2016 Jochen Hoenicke <hoenicke@gmail.com>
|
|
#
|
|
# This library is free software: you can redistribute it and/or modify
|
|
# it under the terms of the GNU Lesser General Public License as published by
|
|
# the Free Software Foundation, either version 3 of the License, or
|
|
# (at your option) any later version.
|
|
#
|
|
# This library is distributed in the hope that it will be useful,
|
|
# but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
# GNU Lesser General Public License for more details.
|
|
#
|
|
# You should have received a copy of the GNU Lesser General Public License
|
|
# along with this library. If not, see <http://www.gnu.org/licenses/>.
|
|
|
|
|
|
class TransportException(Exception):
|
|
pass
|
|
|
|
|
|
class Transport(object):
|
|
|
|
def __init__(self):
|
|
self.session_counter = 0
|
|
|
|
def __str__(self):
|
|
return self.get_path()
|
|
|
|
def get_path(self):
|
|
return '{}:{}'.format(self.PATH_PREFIX, self.device)
|
|
|
|
def session_begin(self):
|
|
if self.session_counter == 0:
|
|
self.open()
|
|
self.session_counter += 1
|
|
|
|
def session_end(self):
|
|
self.session_counter = max(self.session_counter - 1, 0)
|
|
if self.session_counter == 0:
|
|
self.close()
|
|
|
|
def open(self):
|
|
raise NotImplementedError
|
|
|
|
def close(self):
|
|
raise NotImplementedError
|
|
|
|
@classmethod
|
|
def enumerate(cls):
|
|
raise NotImplementedError
|
|
|
|
@classmethod
|
|
def find_by_path(cls, path, prefix_search=False):
|
|
for device in cls.enumerate():
|
|
if path is None or device.get_path() == path \
|
|
or (prefix_search and device.get_path().startswith(path)):
|
|
return device
|
|
|
|
raise TransportException('{} device not found: {}'.format(cls.PATH_PREFIX, path))
|
|
|
|
|
|
def all_transports():
|
|
transports = []
|
|
try:
|
|
from .bridge import BridgeTransport
|
|
transports.append(BridgeTransport)
|
|
except:
|
|
pass
|
|
|
|
try:
|
|
from .hid import HidTransport
|
|
transports.append(HidTransport)
|
|
except:
|
|
pass
|
|
|
|
try:
|
|
from .udp import UdpTransport
|
|
transports.append(UdpTransport)
|
|
except:
|
|
pass
|
|
|
|
try:
|
|
from .webusb import WebUsbTransport
|
|
transports.append(WebUsbTransport)
|
|
except:
|
|
pass
|
|
|
|
return transports
|
|
|
|
|
|
def enumerate_devices():
|
|
return [device
|
|
for transport in all_transports()
|
|
for device in transport.enumerate()]
|
|
|
|
|
|
def get_transport(path=None, prefix_search=False):
|
|
if path is None:
|
|
try:
|
|
return enumerate_devices()[0]
|
|
except IndexError:
|
|
raise Exception("No TREZOR device found") from None
|
|
|
|
# Find whether B is prefix of A (transport name is part of the path)
|
|
# or A is prefix of B (path is a prefix, or a name, of transport).
|
|
# This naively expects that no two transports have a common prefix.
|
|
def match_prefix(a, b):
|
|
return a.startswith(b) or b.startswith(a)
|
|
|
|
transports = [t for t in all_transports() if match_prefix(path, t.PATH_PREFIX)]
|
|
if transports:
|
|
return transports[0].find_by_path(path, prefix_search=prefix_search)
|
|
|
|
raise Exception("Could not find device by path: {}".format(path))
|