mirror of
https://github.com/trezor/trezor-firmware.git
synced 2024-12-23 23:08:14 +00:00
107 lines
3.3 KiB
Python
107 lines
3.3 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 print_function
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import os
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import time
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from select import select
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from .transport import TransportV1
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"""PipeTransport implements fake wire transport over local named pipe.
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Use this transport for talking with trezor simulator."""
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class PipeTransport(TransportV1):
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def __init__(self, device='/tmp/pipe.trezor', is_device=False, *args, **kwargs):
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if not device:
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device = '/tmp/pipe.trezor'
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self.is_device = is_device # set True if act as device
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super(PipeTransport, self).__init__(device, *args, **kwargs)
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@classmethod
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def enumerate(cls):
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raise Exception('This transport cannot enumerate devices')
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@classmethod
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def find_by_path(cls, path=None):
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return cls(path)
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def _open(self):
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if self.is_device:
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self.filename_read = self.device + '.to'
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self.filename_write = self.device + '.from'
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os.mkfifo(self.filename_read, 0o600)
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os.mkfifo(self.filename_write, 0o600)
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else:
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self.filename_read = self.device + '.from'
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self.filename_write = self.device + '.to'
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if not os.path.exists(self.filename_write):
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raise Exception("Not connected")
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self.write_fd = os.open(self.filename_write, os.O_RDWR) # |os.O_NONBLOCK)
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self.write_f = os.fdopen(self.write_fd, 'w+b', 0)
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self.read_fd = os.open(self.filename_read, os.O_RDWR) # |os.O_NONBLOCK)
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self.read_f = os.fdopen(self.read_fd, 'rb', 0)
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def _close(self):
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self.read_f.close()
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self.write_f.close()
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if self.is_device:
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os.unlink(self.filename_read)
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os.unlink(self.filename_write)
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def _ready_to_read(self):
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rlist, _, _ = select([self.read_f], [], [], 0)
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return len(rlist) > 0
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def _write_chunk(self, chunk):
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if len(chunk) != 64:
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raise Exception("Unexpected data length")
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try:
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self.write_f.write(chunk)
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self.write_f.flush()
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except OSError:
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print("Error while writing to socket")
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raise
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def _read_chunk(self):
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while True:
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try:
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data = self.read_f.read(64)
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except IOError:
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print("Failed to read from device")
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raise
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if not len(data):
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time.sleep(0.001)
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continue
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break
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if len(data) != 64:
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raise Exception("Unexpected chunk size: %d" % len(data))
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return bytearray(data)
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