1
0
mirror of https://github.com/trezor/trezor-firmware.git synced 2024-12-23 06:48:16 +00:00
trezor-firmware/trezorlib/transport/bridge.py
2018-08-13 18:22:19 +02:00

124 lines
3.8 KiB
Python

# This file is part of the Trezor project.
#
# Copyright (C) 2012-2018 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 <https://www.gnu.org/licenses/lgpl-3.0.html>.
import binascii
import logging
import struct
from io import BytesIO
import requests
from . import Transport, TransportException
from .. import mapping, protobuf
LOG = logging.getLogger(__name__)
TREZORD_HOST = "http://127.0.0.1:21325"
def get_error(resp):
return " (error=%d str=%s)" % (resp.status_code, resp.json()["error"])
class BridgeTransport(Transport):
"""
BridgeTransport implements transport through TREZOR Bridge (aka trezord).
"""
PATH_PREFIX = "bridge"
HEADERS = {"Origin": "https://python.trezor.io"}
def __init__(self, device):
super().__init__()
self.device = device
self.conn = requests.Session()
self.session = None
self.response = None
def get_path(self):
return "%s:%s" % (self.PATH_PREFIX, self.device["path"])
@classmethod
def enumerate(cls):
try:
r = requests.post(TREZORD_HOST + "/enumerate", headers=cls.HEADERS)
if r.status_code != 200:
raise TransportException(
"trezord: Could not enumerate devices" + get_error(r)
)
return [BridgeTransport(dev) for dev in r.json()]
except Exception:
return []
def open(self):
r = self.conn.post(
TREZORD_HOST + "/acquire/%s/null" % self.device["path"],
headers=self.HEADERS,
)
if r.status_code != 200:
raise TransportException(
"trezord: Could not acquire session" + get_error(r)
)
self.session = r.json()["session"]
def close(self):
if not self.session:
return
r = self.conn.post(
TREZORD_HOST + "/release/%s" % self.session, headers=self.HEADERS
)
if r.status_code != 200:
raise TransportException(
"trezord: Could not release session" + get_error(r)
)
self.session = None
def write(self, msg):
LOG.debug(
"sending message: {}".format(msg.__class__.__name__),
extra={"protobuf": msg},
)
data = BytesIO()
protobuf.dump_message(data, msg)
ser = data.getvalue()
header = struct.pack(">HL", mapping.get_type(msg), len(ser))
data = binascii.hexlify(header + ser).decode()
r = self.conn.post(
TREZORD_HOST + "/call/%s" % self.session, data=data, headers=self.HEADERS
)
if r.status_code != 200:
raise TransportException("trezord: Could not write message" + get_error(r))
self.response = r.text
def read(self):
if self.response is None:
raise TransportException("No response stored")
data = binascii.unhexlify(self.response)
headerlen = struct.calcsize(">HL")
(msg_type, datalen) = struct.unpack(">HL", data[:headerlen])
data = BytesIO(data[headerlen : headerlen + datalen])
msg = protobuf.load_message(data, mapping.get_class(msg_type))
LOG.debug(
"received message: {}".format(msg.__class__.__name__),
extra={"protobuf": msg},
)
self.response = None
return msg
TRANSPORT = BridgeTransport