mirror of
https://github.com/GNS3/gns3-server
synced 2024-11-24 17:28:08 +00:00
127 lines
4.6 KiB
Python
127 lines
4.6 KiB
Python
# -*- coding: utf-8 -*-
|
|
#
|
|
# Copyright (C) 2014 GNS3 Technologies Inc.
|
|
#
|
|
# This program is free software: you can redistribute it and/or modify
|
|
# it under the terms of the GNU General Public License as published by
|
|
# the Free Software Foundation, either version 3 of the License, or
|
|
# (at your option) any later version.
|
|
#
|
|
# This program 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 General Public License for more details.
|
|
#
|
|
# You should have received a copy of the GNU General Public License
|
|
# along with this program. If not, see <http://www.gnu.org/licenses/>.
|
|
|
|
import re
|
|
import copy
|
|
import asyncio
|
|
import asyncio.subprocess
|
|
|
|
import logging
|
|
log = logging.getLogger(__name__)
|
|
|
|
READ_SIZE = 4096
|
|
|
|
|
|
class AsyncioRawCommandServer:
|
|
"""
|
|
Expose a process on the network his stdoud and stdin will be forward
|
|
on network
|
|
"""
|
|
|
|
def __init__(self, command, replaces=[]):
|
|
"""
|
|
:param command: Command to run
|
|
:param replaces: List of tuple to replace in the output ex: [(b":8080", b":6000")]
|
|
"""
|
|
self._command = command
|
|
self._replaces = replaces
|
|
# We limit number of process
|
|
self._lock = asyncio.Semaphore(value=4)
|
|
|
|
@asyncio.coroutine
|
|
def run(self, network_reader, network_writer):
|
|
yield from self._lock.acquire()
|
|
process = yield from asyncio.subprocess.create_subprocess_exec(*self._command,
|
|
stdout=asyncio.subprocess.PIPE,
|
|
stderr=asyncio.subprocess.STDOUT,
|
|
stdin=asyncio.subprocess.PIPE)
|
|
try:
|
|
yield from self._process(network_reader, network_writer, process.stdout, process.stdin)
|
|
except ConnectionResetError:
|
|
network_writer.close()
|
|
if process.returncode is None:
|
|
process.kill()
|
|
yield from process.wait()
|
|
self._lock.release()
|
|
|
|
@asyncio.coroutine
|
|
def _process(self, network_reader, network_writer, process_reader, process_writer):
|
|
replaces = []
|
|
# Server host from the client point of view
|
|
host = network_writer.transport.get_extra_info("sockname")[0]
|
|
for replace in self._replaces:
|
|
if b'{{HOST}}' in replace[1]:
|
|
replaces.append((replace[0], replace[1].replace(b'{{HOST}}', host.encode()), ))
|
|
else:
|
|
replaces.append((replace[0], replace[1], ))
|
|
|
|
network_read = asyncio.async(network_reader.read(READ_SIZE))
|
|
reader_read = asyncio.async(process_reader.read(READ_SIZE))
|
|
timeout = 30
|
|
|
|
while True:
|
|
done, pending = yield from asyncio.wait(
|
|
[
|
|
network_read,
|
|
reader_read
|
|
],
|
|
timeout=timeout,
|
|
return_when=asyncio.FIRST_COMPLETED)
|
|
if len(done) == 0:
|
|
raise ConnectionResetError()
|
|
for coro in done:
|
|
data = coro.result()
|
|
if coro == network_read:
|
|
if network_reader.at_eof():
|
|
raise ConnectionResetError()
|
|
|
|
network_read = asyncio.async(network_reader.read(READ_SIZE))
|
|
|
|
process_writer.write(data)
|
|
yield from process_writer.drain()
|
|
elif coro == reader_read:
|
|
if process_reader.at_eof():
|
|
raise ConnectionResetError()
|
|
|
|
reader_read = asyncio.async(process_reader.read(READ_SIZE))
|
|
|
|
for replace in replaces:
|
|
data = data.replace(replace[0], replace[1])
|
|
timeout = 2 # We reduce the timeout when the process start to return stuff to avoid problem with server not closing the connection
|
|
|
|
network_writer.write(data)
|
|
yield from network_writer.drain()
|
|
|
|
|
|
if __name__ == '__main__':
|
|
logging.basicConfig(level=logging.DEBUG)
|
|
loop = asyncio.get_event_loop()
|
|
|
|
command = ["nc", "localhost", "80"]
|
|
server = AsyncioRawCommandServer(command, replaces=[(b"work", b"{{HOST}}", )])
|
|
coro = asyncio.start_server(server.run, '0.0.0.0', 4444, loop=loop)
|
|
s = loop.run_until_complete(coro)
|
|
|
|
try:
|
|
loop.run_forever()
|
|
except KeyboardInterrupt:
|
|
pass
|
|
# Close the server
|
|
s.close()
|
|
loop.run_until_complete(s.wait_closed())
|
|
loop.close()
|