mirror of
https://github.com/trezor/trezor-firmware.git
synced 2024-12-21 22:08:08 +00:00
151 lines
4.8 KiB
Python
151 lines
4.8 KiB
Python
# This file is part of the Trezor project.
|
|
#
|
|
# Copyright (C) 2012-2019 SatoshiLabs and contributors
|
|
#
|
|
# This library is free software: you can redistribute it and/or modify
|
|
# it under the terms of the GNU Lesser General Public License version 3
|
|
# as published by the Free Software Foundation.
|
|
#
|
|
# 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 License along with this library.
|
|
# If not, see <https://www.gnu.org/licenses/lgpl-3.0.html>.
|
|
|
|
import logging
|
|
from typing import Iterable, List, Type
|
|
|
|
from ..exceptions import TrezorException
|
|
from ..protobuf import MessageType
|
|
|
|
LOG = logging.getLogger(__name__)
|
|
|
|
# USB vendor/product IDs for Trezors
|
|
DEV_TREZOR1 = (0x534C, 0x0001)
|
|
DEV_TREZOR2 = (0x1209, 0x53C1)
|
|
DEV_TREZOR2_BL = (0x1209, 0x53C0)
|
|
|
|
TREZORS = {DEV_TREZOR1, DEV_TREZOR2, DEV_TREZOR2_BL}
|
|
|
|
UDEV_RULES_STR = """
|
|
Do you have udev rules installed?
|
|
https://github.com/trezor/trezor-common/blob/master/udev/51-trezor.rules
|
|
""".strip()
|
|
|
|
|
|
class TransportException(TrezorException):
|
|
pass
|
|
|
|
|
|
class Transport:
|
|
"""Raw connection to a Trezor device.
|
|
|
|
Transport subclass represents a kind of communication link: Trezor Bridge, WebUSB
|
|
or USB-HID connection, or UDP socket of listening emulator(s).
|
|
It can also enumerate devices available over this communication link, and return
|
|
them as instances.
|
|
|
|
Transport instance is a thing that:
|
|
- can be identified and requested by a string URI-like path
|
|
- can open and close sessions, which enclose related operations
|
|
- can read and write protobuf messages
|
|
|
|
You need to implement a new Transport subclass if you invent a new way to connect
|
|
a Trezor device to a computer.
|
|
"""
|
|
|
|
PATH_PREFIX = None # type: str
|
|
ENABLED = False
|
|
|
|
def __str__(self) -> str:
|
|
return self.get_path()
|
|
|
|
def get_path(self) -> str:
|
|
raise NotImplementedError
|
|
|
|
def begin_session(self) -> None:
|
|
raise NotImplementedError
|
|
|
|
def end_session(self) -> None:
|
|
raise NotImplementedError
|
|
|
|
def read(self) -> MessageType:
|
|
raise NotImplementedError
|
|
|
|
def write(self, message: MessageType) -> None:
|
|
raise NotImplementedError
|
|
|
|
@classmethod
|
|
def enumerate(cls) -> Iterable["Transport"]:
|
|
raise NotImplementedError
|
|
|
|
@classmethod
|
|
def find_by_path(cls, path: str, prefix_search: bool = False) -> "Transport":
|
|
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() -> Iterable[Type[Transport]]:
|
|
from .bridge import BridgeTransport
|
|
from .hid import HidTransport
|
|
from .udp import UdpTransport
|
|
from .webusb import WebUsbTransport
|
|
|
|
return set(
|
|
cls
|
|
for cls in (BridgeTransport, HidTransport, UdpTransport, WebUsbTransport)
|
|
if cls.ENABLED
|
|
)
|
|
|
|
|
|
def enumerate_devices() -> Iterable[Transport]:
|
|
devices = [] # type: List[Transport]
|
|
for transport in all_transports():
|
|
name = transport.__name__
|
|
try:
|
|
found = list(transport.enumerate())
|
|
LOG.info("Enumerating {}: found {} devices".format(name, len(found)))
|
|
devices.extend(found)
|
|
except NotImplementedError:
|
|
LOG.error("{} does not implement device enumeration".format(name))
|
|
except Exception as e:
|
|
excname = e.__class__.__name__
|
|
LOG.error("Failed to enumerate {}. {}: {}".format(name, excname, e))
|
|
return devices
|
|
|
|
|
|
def get_transport(path: str = None, prefix_search: bool = False) -> Transport:
|
|
if path is None:
|
|
try:
|
|
return next(iter(enumerate_devices()))
|
|
except StopIteration:
|
|
raise TransportException("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: str, b: str) -> bool:
|
|
return a.startswith(b) or b.startswith(a)
|
|
|
|
LOG.info(
|
|
"looking for device by {}: {}".format(
|
|
"prefix" if prefix_search else "full path", path
|
|
)
|
|
)
|
|
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 TransportException("Could not find device by path: {}".format(path))
|