mirror of
https://github.com/trezor/trezor-firmware.git
synced 2024-12-22 22:38:08 +00:00
183 lines
5.5 KiB
Python
183 lines
5.5 KiB
Python
# This file is part of the TREZOR project.
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#
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# Copyright (C) 2012-2016 Marek Palatinus <slush@satoshilabs.com>
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# Copyright (C) 2012-2016 Pavol Rusnak <stick@satoshilabs.com>
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#
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# This library is free software: you can redistribute it and/or modify
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# it under the terms of the GNU Lesser General Public License as published by
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# the Free Software Foundation, either version 3 of the License, or
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# (at your option) any later version.
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#
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# This library is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU Lesser General Public License for more details.
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#
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# You should have received a copy of the GNU Lesser General Public License
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# along with this library. If not, see <http://www.gnu.org/licenses/>.
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from __future__ import absolute_import
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import time
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import hid
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import os
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from .protocol_v1 import ProtocolV1
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from .protocol_v2 import ProtocolV2
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from .transport import Transport, TransportException
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DEV_TREZOR1 = (0x534c, 0x0001)
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DEV_TREZOR2 = (0x1209, 0x53c1)
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DEV_TREZOR2_BL = (0x1209, 0x53c0)
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class HidHandle(object):
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def __init__(self, path):
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self.path = path
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self.count = 0
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self.handle = None
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def open(self):
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if self.count == 0:
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self.handle = hid.device()
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self.handle.open_path(self.path)
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self.handle.set_nonblocking(True)
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self.count += 1
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def close(self):
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if self.count == 1:
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self.handle.close()
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if self.count > 0:
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self.count -= 1
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class HidTransport(Transport):
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'''
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HidTransport implements transport over USB HID interface.
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'''
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def __init__(self, device, protocol=None, hid_handle=None):
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super(HidTransport, self).__init__()
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if hid_handle is None:
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hid_handle = HidHandle(device['path'])
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if protocol is None:
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force_v1 = os.environ.get('TREZOR_TRANSPORT_V1', '0')
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if is_trezor2(device) and not int(force_v1):
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protocol = ProtocolV2()
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else:
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protocol = ProtocolV1()
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self.device = device
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self.protocol = protocol
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self.hid = hid_handle
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self.hid_version = None
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def __str__(self):
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return self.device['path'].decode()
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@staticmethod
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def enumerate(debug=False):
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devices = []
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for dev in hid.enumerate(0, 0):
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if not (is_trezor1(dev) or is_trezor2(dev) or is_trezor2_bl(dev)):
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continue
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if debug:
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if not is_debuglink(dev):
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continue
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else:
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if not is_wirelink(dev):
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continue
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devices.append(HidTransport(dev))
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return devices
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@staticmethod
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def find_by_path(path=None):
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for transport in HidTransport.enumerate():
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if path is None or transport.device['path'] == path:
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return transport
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raise TransportException('HID device not found')
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def find_debug(self):
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if isinstance(self.protocol, ProtocolV2):
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# For v2 protocol, lets use the same HID interface, but with a different session
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protocol = ProtocolV2()
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debug = HidTransport(self.device, protocol, self.hid)
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return debug
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if isinstance(self.protocol, ProtocolV1):
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# For v1 protocol, find debug USB interface for the same serial number
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for debug in HidTransport.enumerate(debug=True):
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if debug.device['serial_number'] == self.device['serial_number']:
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return debug
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raise TransportException('Debug HID device not found')
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def open(self):
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self.hid.open()
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if is_trezor1(self.device):
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self.hid_version = self.probe_hid_version()
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else:
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self.hid_version = 2
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self.protocol.session_begin(self)
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def close(self):
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self.protocol.session_end(self)
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self.hid.close()
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self.hid_version = None
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def read(self):
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return self.protocol.read(self)
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def write(self, msg):
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return self.protocol.write(self, msg)
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def write_chunk(self, chunk):
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if len(chunk) != 64:
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raise TransportException('Unexpected chunk size: %d' % len(chunk))
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if self.hid_version == 2:
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self.hid.handle.write(b'\0' + bytearray(chunk))
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else:
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self.hid.handle.write(chunk)
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def read_chunk(self):
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while True:
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chunk = self.hid.handle.read(64)
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if chunk:
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break
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else:
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time.sleep(0.001)
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if len(chunk) != 64:
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raise TransportException('Unexpected chunk size: %d' % len(chunk))
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return bytearray(chunk)
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def probe_hid_version(self):
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n = self.hid.handle.write([0, 63] + [0xFF] * 63)
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if n == 65:
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return 2
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n = self.hid.handle.write([63] + [0xFF] * 63)
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if n == 64:
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return 1
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raise TransportException('Unknown HID version')
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def is_trezor1(dev):
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return (dev['vendor_id'], dev['product_id']) == DEV_TREZOR1
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def is_trezor2(dev):
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return (dev['vendor_id'], dev['product_id']) == DEV_TREZOR2
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def is_trezor2_bl(dev):
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return (dev['vendor_id'], dev['product_id']) == DEV_TREZOR2_BL
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def is_wirelink(dev):
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return (dev['usage_page'] == 0xFF00 or dev['interface_number'] == 0)
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def is_debuglink(dev):
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return (dev['usage_page'] == 0xFF01 or dev['interface_number'] == 1)
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