mirror of https://github.com/GNS3/gns3-server
Julien Duponchelle
8 years ago
commit
9dca7dfe4a
@ -0,0 +1,116 @@
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# -*- coding: utf-8 -*-
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#
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# Copyright (C) 2014 GNS3 Technologies Inc.
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#
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# This program is free software: you can redistribute it and/or modify
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# it under the terms of the GNU 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 program 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 General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program. If not, see <http://www.gnu.org/licenses/>.
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import re
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import asyncio
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import asyncio.subprocess
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import logging
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log = logging.getLogger(__name__)
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READ_SIZE = 4096
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class AsyncioRawCommandServer:
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"""
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Expose a process on the network his stdoud and stdin will be forward
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on network
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"""
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def __init__(self, command, replaces=[]):
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"""
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:param command: Command to run
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:param replaces: List of tuple to replace in the output ex: [(b":8080", b":6000")]
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"""
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self._command = command
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self._replaces = replaces
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# We limit number of process
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self._lock = asyncio.Semaphore(value=4)
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@asyncio.coroutine
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def run(self, network_reader, network_writer):
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yield from self._lock.acquire()
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process = yield from asyncio.subprocess.create_subprocess_exec(*self._command,
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stdout=asyncio.subprocess.PIPE,
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stderr=asyncio.subprocess.STDOUT,
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stdin=asyncio.subprocess.PIPE)
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try:
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yield from self._process(network_reader, network_writer, process.stdout, process.stdin)
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except ConnectionResetError:
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network_writer.close()
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if process.returncode is None:
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process.kill()
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yield from process.wait()
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self._lock.release()
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@asyncio.coroutine
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def _process(self, network_reader, network_writer, process_reader, process_writer):
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network_read = asyncio.async(network_reader.read(READ_SIZE))
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reader_read = asyncio.async(process_reader.read(READ_SIZE))
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timeout = 30
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while True:
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done, pending = yield from asyncio.wait(
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[
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network_read,
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reader_read
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],
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timeout=timeout,
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return_when=asyncio.FIRST_COMPLETED)
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if len(done) == 0:
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raise ConnectionResetError()
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for coro in done:
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data = coro.result()
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if coro == network_read:
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if network_reader.at_eof():
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raise ConnectionResetError()
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network_read = asyncio.async(network_reader.read(READ_SIZE))
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process_writer.write(data)
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yield from process_writer.drain()
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elif coro == reader_read:
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if process_reader.at_eof():
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raise ConnectionResetError()
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reader_read = asyncio.async(process_reader.read(READ_SIZE))
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for replace in self._replaces:
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data = data.replace(replace[0], replace[1])
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timeout = 2 # We reduce the timeout when the process start to return stuff to avoid problem with server not closing the connection
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network_writer.write(data)
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yield from network_writer.drain()
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if __name__ == '__main__':
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logging.basicConfig(level=logging.DEBUG)
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loop = asyncio.get_event_loop()
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command = ["nc", "localhost", "80"]
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server = AsyncioRawCommandServer(command)
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coro = asyncio.start_server(server.run, '127.0.0.1', 4444, loop=loop)
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s = loop.run_until_complete(coro)
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try:
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loop.run_forever()
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except KeyboardInterrupt:
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pass
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# Close the server
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s.close()
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loop.run_until_complete(s.wait_closed())
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loop.close()
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