# This file is part of the TREZOR project. # # Copyright (C) 2012-2016 Marek Palatinus # Copyright (C) 2012-2016 Pavol Rusnak # # 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 . from __future__ import absolute_import import socket from .protocol_v2 import ProtocolV2 from .transport import Transport class UdpTransport(Transport): DEFAULT_HOST = '127.0.0.1' DEFAULT_PORT = 21324 def __init__(self, device=None, protocol=None): super(UdpTransport, self).__init__() if not device: host = UdpTransport.DEFAULT_HOST port = UdpTransport.DEFAULT_PORT else: host = device.split(':').get(0) port = device.split(':').get(1, UdpTransport.DEFAULT_PORT) port = int(port) if not protocol: protocol = ProtocolV2() self.device = (host, port) self.protocol = protocol self.socket = None def __str__(self): return self.device @staticmethod def enumerate(): raise NotImplementedError('This transport cannot enumerate devices') @staticmethod def find_by_path(path=None): return UdpTransport(path) def open(self): self.socket = socket.socket(socket.AF_INET, socket.SOCK_DGRAM) self.socket.connect(self.device) self.socket.settimeout(10) self.protocol.session_begin(self) def close(self): if self.socket: self.protocol.session_end(self) self.socket.close() self.socket = None def read(self): return self.protocol.read(self) def write(self, msg): return self.protocol.write(self, msg) def write_chunk(self, chunk): if len(chunk) != 64: raise TransportException('Unexpected data length') self.socket.sendall(chunk) def read_chunk(self): while True: try: chunk = self.socket.recv(64) break except socket.timeout: continue if len(chunk) != 64: raise TransportException('Unexpected chunk size: %d' % len(chunk)) return bytearray(chunk)