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142 lines
4.6 KiB
142 lines
4.6 KiB
# This file is part of the Trezor project.
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#
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# Copyright (C) 2012-2019 SatoshiLabs and contributors
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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 version 3
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# as published by the Free Software Foundation.
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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 License along with this library.
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# If not, see <https://www.gnu.org/licenses/lgpl-3.0.html>.
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import socket
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import time
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from typing import Iterable, Optional, cast
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from . import TransportException
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from .protocol import ProtocolBasedTransport, get_protocol
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SOCKET_TIMEOUT = 10
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class UdpTransport(ProtocolBasedTransport):
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DEFAULT_HOST = "127.0.0.1"
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DEFAULT_PORT = 21324
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PATH_PREFIX = "udp"
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ENABLED = True
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def __init__(self, device: str = None) -> None:
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if not device:
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host = UdpTransport.DEFAULT_HOST
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port = UdpTransport.DEFAULT_PORT
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else:
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devparts = device.split(":")
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host = devparts[0]
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port = int(devparts[1]) if len(devparts) > 1 else UdpTransport.DEFAULT_PORT
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self.device = (host, port)
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self.socket = None # type: Optional[socket.socket]
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protocol = get_protocol(self, want_v2=False)
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super().__init__(protocol=protocol)
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def get_path(self) -> str:
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return "{}:{}:{}".format(self.PATH_PREFIX, *self.device)
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def find_debug(self) -> "UdpTransport":
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host, port = self.device
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return UdpTransport("{}:{}".format(host, port + 1))
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@classmethod
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def _try_path(cls, path: str) -> "UdpTransport":
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d = cls(path)
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try:
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d.open()
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if d._ping():
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return d
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else:
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raise TransportException(
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"No Trezor device found at address {}".format(d.get_path())
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)
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finally:
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d.close()
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@classmethod
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def enumerate(cls) -> Iterable["UdpTransport"]:
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default_path = "{}:{}".format(cls.DEFAULT_HOST, cls.DEFAULT_PORT)
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try:
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return [cls._try_path(default_path)]
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except TransportException:
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return []
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@classmethod
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def find_by_path(cls, path: str, prefix_search: bool = False) -> "UdpTransport":
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if prefix_search:
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return cast(UdpTransport, super().find_by_path(path, prefix_search))
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# This is *technically* type-able: mark `find_by_path` as returning
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# the same type from which `cls` comes from.
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# Mypy can't handle that though, so here we are.
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else:
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path = path.replace("{}:".format(cls.PATH_PREFIX), "")
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return cls._try_path(path)
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def wait_until_ready(self, timeout: float = 10) -> None:
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try:
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self.open()
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self.socket.settimeout(0)
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start = time.monotonic()
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while True:
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if self._ping():
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break
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elapsed = time.monotonic() - start
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if elapsed >= timeout:
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raise TransportException("Timed out waiting for connection.")
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time.sleep(0.05)
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finally:
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self.close()
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def open(self) -> None:
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self.socket = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
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self.socket.connect(self.device)
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self.socket.settimeout(SOCKET_TIMEOUT)
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def close(self) -> None:
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if self.socket is not None:
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self.socket.close()
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self.socket = None
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def _ping(self) -> bool:
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"""Test if the device is listening."""
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assert self.socket is not None
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resp = None
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try:
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self.socket.sendall(b"PINGPING")
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resp = self.socket.recv(8)
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except Exception:
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pass
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return resp == b"PONGPONG"
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def write_chunk(self, chunk: bytes) -> None:
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assert self.socket is not None
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if len(chunk) != 64:
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raise TransportException("Unexpected data length")
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self.socket.sendall(chunk)
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def read_chunk(self) -> bytes:
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assert self.socket is not None
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while True:
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try:
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chunk = self.socket.recv(64)
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break
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except socket.timeout:
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continue
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if len(chunk) != 64:
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raise TransportException("Unexpected chunk size: %d" % len(chunk))
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return bytearray(chunk)
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