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trezor-firmware/trezorlib/transport/bridge.py

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# This file is part of the TREZOR project.
#
# Copyright (C) 2012-2016 Marek Palatinus <slush@satoshilabs.com>
# Copyright (C) 2012-2016 Pavol Rusnak <stick@satoshilabs.com>
# Copyright (C) 2016 Jochen Hoenicke <hoenicke@gmail.com>
#
# 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 <http://www.gnu.org/licenses/>.
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import requests
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import binascii
from io import BytesIO
import struct
from .. import mapping
from .. import messages
from .. import protobuf
from . import Transport, TransportException
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TREZORD_HOST = 'http://127.0.0.1:21325'
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def get_error(resp):
return ' (error=%d str=%s)' % (resp.status_code, resp.json()['error'])
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class BridgeTransport(Transport):
'''
BridgeTransport implements transport through TREZOR Bridge (aka trezord).
'''
PATH_PREFIX = 'bridge'
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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
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def get_path(self):
return '%s:%s' % (self.PATH_PREFIX, self.device['path'])
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@classmethod
def enumerate(cls):
try:
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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:
return []
def open(self):
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r = self.conn.post(TREZORD_HOST + '/acquire/%s/null' % self.device['path'], headers=self.HEADERS)
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if r.status_code != 200:
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raise TransportException('trezord: Could not acquire session' + get_error(r))
self.session = r.json()['session']
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def close(self):
if not self.session:
return
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r = self.conn.post(TREZORD_HOST + '/release/%s' % self.session, headers=self.HEADERS)
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if r.status_code != 200:
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raise TransportException('trezord: Could not release session' + get_error(r))
self.session = None
def write(self, msg):
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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(
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TREZORD_HOST + '/call/%s' % self.session, data=data, headers=self.HEADERS)
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if r.status_code != 200:
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raise TransportException('trezord: Could not write message' + get_error(r))
self.response = r.text
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def read(self):
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if self.response is None:
raise TransportException('No response stored')
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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))
self.response = None
return msg