# This file is part of the Trezor project. # # Copyright (C) 2012-2019 SatoshiLabs and contributors # # This library is free software: you can redistribute it and/or modify # it under the terms of the GNU Lesser General Public License version 3 # as published by the Free Software Foundation. # # 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 License along with this library. # If not, see . import socket from typing import Iterable, Optional, cast from . import TransportException from .protocol import ProtocolBasedTransport, get_protocol class UdpTransport(ProtocolBasedTransport): DEFAULT_HOST = "127.0.0.1" DEFAULT_PORT = 21324 PATH_PREFIX = "udp" ENABLED = True def __init__(self, device: str = None) -> None: if not device: host = UdpTransport.DEFAULT_HOST port = UdpTransport.DEFAULT_PORT else: devparts = device.split(":") host = devparts[0] port = int(devparts[1]) if len(devparts) > 1 else UdpTransport.DEFAULT_PORT self.device = (host, port) self.socket = None # type: Optional[socket.socket] protocol = get_protocol(self, want_v2=False) super().__init__(protocol=protocol) def get_path(self) -> str: return "{}:{}:{}".format(self.PATH_PREFIX, *self.device) def find_debug(self) -> "UdpTransport": host, port = self.device return UdpTransport("{}:{}".format(host, port + 1)) @classmethod def _try_path(cls, path: str) -> "UdpTransport": d = cls(path) try: d.open() if d._ping(): return d else: raise TransportException( "No TREZOR device found at address {}".format(path) ) finally: d.close() @classmethod def enumerate(cls) -> Iterable["UdpTransport"]: default_path = "{}:{}".format(cls.DEFAULT_HOST, cls.DEFAULT_PORT) try: return [cls._try_path(default_path)] except TransportException: return [] @classmethod def find_by_path(cls, path: str, prefix_search: bool = False) -> "UdpTransport": if prefix_search: return cast(UdpTransport, super().find_by_path(path, prefix_search)) # This is *technically* type-able: mark `find_by_path` as returning # the same type from which `cls` comes from. # Mypy can't handle that though, so here we are. else: path = path.replace("{}:".format(cls.PATH_PREFIX), "") return cls._try_path(path) def open(self) -> None: self.socket = socket.socket(socket.AF_INET, socket.SOCK_DGRAM) self.socket.connect(self.device) self.socket.settimeout(10) def close(self) -> None: if self.socket is not None: self.socket.close() self.socket = None def _ping(self) -> bool: """Test if the device is listening.""" assert self.socket is not None resp = None try: self.socket.sendall(b"PINGPING") resp = self.socket.recv(8) except Exception: pass return resp == b"PONGPONG" def write_chunk(self, chunk: bytes) -> None: assert self.socket is not None if len(chunk) != 64: raise TransportException("Unexpected data length") self.socket.sendall(chunk) def read_chunk(self) -> bytes: assert self.socket is not None 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)