mirror of
https://github.com/trezor/trezor-firmware.git
synced 2024-10-13 11:29:11 +00:00
88988172b9
This allows us to return early from a `write`, which we need in cases where we want to perform an operation inbetween `read` and `write` - namely, callback for ButtonRequest should technically be invoked after returning ButtonAck but before waiting for device's response. Of course that doesn't really work. The callback will actually be invoked _before_ ButtonAck, so there's still the condition that it must return immediately or the device gets stuck with a black screen. But doing this allows us to write code *as if* it worked, which lets the other transports run free and wild, by which I mean, do the Right Thing
127 lines
3.9 KiB
Python
127 lines
3.9 KiB
Python
# This file is part of the Trezor project.
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#
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# Copyright (C) 2012-2018 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 logging
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import struct
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from io import BytesIO
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import requests
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from . import Transport, TransportException
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from .. import mapping, protobuf
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LOG = logging.getLogger(__name__)
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TREZORD_HOST = "http://127.0.0.1:21325"
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class BridgeTransport(Transport):
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"""
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BridgeTransport implements transport through TREZOR Bridge (aka trezord).
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"""
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PATH_PREFIX = "bridge"
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HEADERS = {"Origin": "https://python.trezor.io"}
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def __init__(self, device):
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super().__init__()
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self.device = device
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self.conn = requests.Session()
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self.session = None
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self.request = None
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def get_path(self):
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return "%s:%s" % (self.PATH_PREFIX, self.device["path"])
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@classmethod
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def _call(cls, action, data=None, uri_suffix=None, session=None):
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if uri_suffix is not None:
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uri_suffix = "/" + uri_suffix
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elif session is not None:
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uri_suffix = "/{}".format(session)
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else:
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uri_suffix = ""
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url = "{}/{}{}".format(TREZORD_HOST, action, uri_suffix)
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r = requests.post(url, headers=cls.HEADERS, data=data)
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if r.status_code != 200:
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raise TransportException(
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"trezord: '{}' action failed with code {}: {}".format(
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action, r.status_code, r.json().get("error", "(no error message)")
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)
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)
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return r
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@classmethod
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def enumerate(cls):
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try:
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r = cls._call("enumerate")
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return [BridgeTransport(dev) for dev in r.json()]
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except Exception:
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return []
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def open(self):
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r = self._call("acquire", uri_suffix="{}/null".format(self.device["path"]))
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self.session = r.json()["session"]
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def close(self):
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if not self.session:
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return
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self._call("release", session=self.session)
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self.session = None
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def write(self, msg):
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if self.request is not None:
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raise TransportException("trezord can't perform two writes without a read")
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LOG.debug(
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"preparing message: {}".format(msg.__class__.__name__),
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extra={"protobuf": msg},
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)
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# encode the message
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data = BytesIO()
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protobuf.dump_message(data, msg)
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ser = data.getvalue()
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header = struct.pack(">HL", mapping.get_type(msg), len(ser))
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# store for later
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self.request = (header + ser).hex()
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def read(self):
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if self.request is None:
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raise TransportException("trezord: no request in queue")
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try:
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LOG.debug("sending prepared message")
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r = self._call("call", data=self.request, session=self.session)
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data = bytes.fromhex(r.text)
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headerlen = struct.calcsize(">HL")
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msg_type, datalen = struct.unpack(">HL", data[:headerlen])
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data = BytesIO(data[headerlen : headerlen + datalen])
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msg = protobuf.load_message(data, mapping.get_class(msg_type))
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LOG.debug(
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"received message: {}".format(msg.__class__.__name__),
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extra={"protobuf": msg},
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)
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return msg
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finally:
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self.request = None
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TRANSPORT = BridgeTransport
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