mirror of
https://github.com/trezor/trezor-firmware.git
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105 lines
3.6 KiB
Python
105 lines
3.6 KiB
Python
# This file is part of the TREZOR project.
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#
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# Copyright (C) 2012-2016 Marek Palatinus <slush@satoshilabs.com>
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# Copyright (C) 2012-2016 Pavol Rusnak <stick@satoshilabs.com>
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# Copyright (C) 2016 Jochen Hoenicke <hoenicke@gmail.com>
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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 as published by
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# the Free Software Foundation, either version 3 of the License, or
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# (at your option) any later version.
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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 GNU Lesser General Public License
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# along with this library. If not, see <http://www.gnu.org/licenses/>.
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from __future__ import absolute_import
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import requests
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import binascii
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from io import BytesIO
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import struct
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from . import mapping
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from . import messages
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from . import protobuf
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from .transport import Transport, TransportException
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TREZORD_HOST = 'http://127.0.0.1:21325'
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def get_error(resp):
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return ' (error=%d str=%s)' % (resp.status_code, resp.json()['error'])
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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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def __init__(self, device):
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super(BridgeTransport, self).__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.response = None
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def __str__(self):
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return self.device['path']
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@staticmethod
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def enumerate():
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r = requests.post(TREZORD_HOST + '/enumerate')
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if r.status_code != 200:
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raise TransportException('trezord: Could not enumerate devices' + get_error(r))
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return [BridgeTransport(dev) for dev in r.json()]
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@staticmethod
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def find_by_path(path):
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for transport in BridgeTransport.enumerate():
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if path is None or transport.device['path'] == path:
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return transport
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raise TransportException('Bridge device not found')
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def open(self):
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r = self.conn.post(TREZORD_HOST + '/acquire/%s/null' % self.device['path'])
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if r.status_code != 200:
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raise TransportException('trezord: Could not acquire session' + get_error(r))
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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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r = self.conn.post(TREZORD_HOST + '/release/%s' % self.session)
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if r.status_code != 200:
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raise TransportException('trezord: Could not release session' + get_error(r))
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self.session = None
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def write(self, msg):
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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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data = binascii.hexlify(header + ser).decode()
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r = self.conn.post(
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TREZORD_HOST + '/call/%s' % self.session, data=data)
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if r.status_code != 200:
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raise TransportException('trezord: Could not write message' + get_error(r))
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self.response = r.text
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def read(self):
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if self.response is None:
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raise TransportException('No response stored')
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data = binascii.unhexlify(self.response)
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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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self.response = None
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return msg
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