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144 lines
4.7 KiB
Python
144 lines
4.7 KiB
Python
'''USB HID implementation of Transport.'''
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import hid
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import time
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import platform
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from transport import Transport, ConnectionError, NotImplementedException
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DEVICE_IDS = [
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(0x10c4, 0xea80), # Shield
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(0x534c, 0x0001), # Trezor
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]
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class FakeRead(object):
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# Let's pretend we have a file-like interface
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def __init__(self, func):
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self.func = func
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def read(self, size):
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return self.func(size)
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class HidTransport(Transport):
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def __init__(self, device, *args, **kwargs):
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self.hid = None
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self.buffer = ''
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# self.read_timeout = kwargs.get('read_timeout')
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device = device[int(bool(kwargs.get('debug_link')))]
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super(HidTransport, self).__init__(device, *args, **kwargs)
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@classmethod
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def _detect_debuglink(cls, path):
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# Takes platform-specific path of USB and
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# decide if the HID interface is normal transport
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# or debuglink
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if platform.system() == 'Linux':
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# Sample: 0003:0017:00
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if path.endswith(':00'):
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return False
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return True
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elif platform.system() == 'Windows':
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# Sample: \\\\?\\hid#vid_534c&pid_0001&mi_01#7&1d71791f&0&0000#{4d1e55b2-f16f-11cf-88cb-001111000030}
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# Note: 'mi' parameter is optional and might be unset
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if '&mi_01#' in path: # ,,,<o.O>,,,~
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return True
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return False
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elif platform.system() == 'Darwin':
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# DebugLink doesn't work on Mac
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return False
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else:
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raise Exception("USB interface detection not implemented for %s" % platform.system())
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@classmethod
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def enumerate(cls):
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"""
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Return a list of available TREZOR devices.
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"""
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devices = {}
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for d in hid.enumerate(0, 0):
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vendor_id = d['vendor_id']
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product_id = d['product_id']
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serial_number = d['serial_number']
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path = d['path']
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# HIDAPI on Mac cannot detect correct HID interfaces, so device with
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# DebugLink doesn't work on Mac...
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if devices.get(serial_number) != None and devices[serial_number][0] == path:
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raise Exception("Two devices with the same path and S/N found. This is Mac, right? :-/")
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if (vendor_id, product_id) in DEVICE_IDS:
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devices.setdefault(serial_number, [None, None])
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devices[serial_number][int(bool(cls._detect_debuglink(path)))] = path
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# List of two-tuples (path_normal, path_debuglink)
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return devices.values()
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def is_connected(self):
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"""
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Check if the device is still connected.
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"""
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for d in hid.enumerate(0, 0):
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if d['path'] == self.device:
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return True
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return False
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def _open(self):
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self.buffer = ''
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self.hid = hid.device()
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self.hid.open_path(self.device)
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self.hid.set_nonblocking(True)
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self.hid.send_feature_report([0x41, 0x01]) # enable UART
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self.hid.send_feature_report([0x43, 0x03]) # purge TX/RX FIFOs
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def _close(self):
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self.hid.close()
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self.buffer = ''
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self.hid = None
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def ready_to_read(self):
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return False
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def _write(self, msg, protobuf_msg):
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msg = bytearray(msg)
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while len(msg):
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# Report ID, data padded to 63 bytes
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self.hid.write([63, ] + list(msg[:63]) + [0] * (63 - len(msg[:63])))
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msg = msg[63:]
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def _read(self):
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(msg_type, datalen) = self._read_headers(FakeRead(self._raw_read))
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return (msg_type, self._raw_read(datalen))
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def _raw_read(self, length):
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start = time.time()
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while len(self.buffer) < length:
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data = self.hid.read(64)
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if not len(data):
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if time.time() - start > 10:
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# Over 10 s of no response, let's check if
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# device is still alive
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if not self.is_connected():
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raise ConnectionError("Connection failed")
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else:
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# Restart timer
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start = time.time()
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time.sleep(0.001)
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continue
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report_id = data[0]
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if report_id > 63:
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# Command report
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raise Exception("Not implemented")
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# Payload received, skip the report ID
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self.buffer += str(bytearray(data[1:]))
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ret = self.buffer[:length]
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self.buffer = self.buffer[length:]
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return ret
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