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trezor-firmware/trezorlib/transport_udp.py
2016-11-25 22:53:55 +01:00

70 lines
2.3 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>
#
# 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/>.
'''UDP Socket implementation of Transport.'''
import socket
from select import select
from .transport import TransportV2, ConnectionError
class UdpTransport(TransportV2):
def __init__(self, device, *args, **kwargs):
device = device.split(':')
if len(device) < 2:
if not device[0]:
# Default port used by trezor v2
device = ('127.0.0.1', 21324)
else:
device = ('127.0.0.1', int(device[0]))
else:
device = (device[0], int(device[1]))
self.socket = None
super(UdpTransport, self).__init__(device, *args, **kwargs)
def _open(self):
self.socket = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
self.socket.connect(self.device)
self.socket.settimeout(10)
def _close(self):
self.socket.close()
self.socket = None
def _ready_to_read(self):
rlist, _, _ = select([self.socket], [], [], 0)
return len(rlist) > 0
def _write_chunk(self, chunk):
if len(chunk) != 64:
raise Exception("Unexpected data length")
self.socket.sendall(chunk)
def _read_chunk(self):
while True:
try:
data = self.socket.recv(64)
break
except socket.timeout:
continue
if len(data) != 64:
raise Exception("Unexpected chunk size: %d" % len(data))
return bytearray(data)