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#!/usr/bin/env python3
import sys
import logging
import argparse
import ssl
# asyncio requires at least Python 3.3
if sys.version_info.major < 3 or \
(sys.version_info.major > 2 and
sys.version_info.minor < 3):
print('At least Python version 3.3 is required to run this script!')
sys.exit(1)
try:
# Python 3.4 ships with asyncio in the standard libraries. Users with Python 3.3
# need to install it, e.g.: pip install asyncio
import asyncio
except ImportError:
print('Please install asyncio!')
sys.exit(1)
try:
# If available, use uvloop for better performance
import uvloop
asyncio.set_event_loop_policy(uvloop.EventLoopPolicy())
except ImportError:
pass
LOGGER = logging.getLogger(__name__)
ARGS = argparse.ArgumentParser(description="Generic traffic forwarder")
ARGS.add_argument(
'-H', '--host', default='127.0.0.1',
help='Host to listen [default: %(default)s]')
ARGS.add_argument(
'-p', '--port', type=int, default=8800,
help='Port to listen [default: %(default)d]')
ARGS.add_argument(
'-T', '--target', default='127.0.0.1',
help='Host to connect [default: %(default)s]')
ARGS.add_argument(
'-x', '--target-port', type=int, default=8080,
help='Port to connect [default: %(default)d]')
ARGS.add_argument(
'--ssl', action='store_true', dest='ssl',
default=False, help='Create a SSL listener')
ARGS.add_argument(
'--cert', help='Certificate for SSL server')
ARGS.add_argument(
'--target-ssl', action='store_true', dest='target_ssl',
default=False, help='Connect to target with SSL')
ARGS.add_argument(
'-v', '--verbose', action='count', dest='level',
default=2, help='Verbose logging (repeat for more verbosity)')
ARGS.add_argument(
'-q', '--quiet', action='store_const', const=0, dest='level',
default=2, help='Only log errors')
def request_hook(request):
"""Manipulate request before they will be sent to the target."""
return request
def response_hook(response):
"""Manipulate response before they will be sent back to the source."""
return response
class ForwardClient(asyncio.Protocol):
def __init__(self, transport):
self.connected = False
self.server_transport = transport
def connection_made(self, transport):
self.connected = True
self.transport = transport
def data_received(self, data):
LOGGER.debug('Client data received: {}'.format(data))
data = response_hook(data)
self.server_transport.write(data)
def connection_lost(self, *args):
self.connected = False
class ForwardProtocol(asyncio.Protocol):
def __init__(self, target, target_port, target_ssl=None, loop=None):
self.loop = loop or asyncio.get_event_loop()
self.target = target
self.target_port = target_port
self.target_ssl = target_ssl
self.clients = {}
def connection_made(self, transport):
self.transport = transport
def data_received(self, data):
LOGGER.debug('Data received: {!r}'.format(data))
asyncio.Task(self.send_data(data))
@asyncio.coroutine
def send_data(self, data):
peername = self.transport.get_extra_info('peername')
client = self.clients.get(peername)
if not client or not client.connected:
if self.target_ssl:
ssl_context = ssl.create_default_context(ssl.Purpose.SERVER_AUTH)
else:
ssl_context = None
c = ForwardClient(self.transport)
protocol, client = yield from self.loop.create_connection(
lambda: c, self.target, self.target_port, ssl=ssl_context)
self.clients[peername] = client
data = request_hook(data)
client.transport.write(data)
def main():
args = ARGS.parse_args()
levels = [logging.ERROR, logging.WARN, logging.INFO, logging.DEBUG]
if args.level > 2:
format = '[%(filename)s:%(lineno)s - %(funcName)20s() ] %(message)s'
else:
format = '%(message)s'
logging.basicConfig(level=levels[min(args.level, len(levels)-1)], format=format)
if args.ssl:
if not args.cert:
LOGGER.error('Certificate missing')
return 1
ssl_ctx = ssl.create_default_context(ssl.Purpose.CLIENT_AUTH)
ssl_ctx.load_cert_chain(args.cert)
else:
ssl_ctx = None
loop = asyncio.get_event_loop()
forwarder = ForwardProtocol(args.target, args.target_port, target_ssl=args.target_ssl)
coro = loop.create_server(
lambda: forwarder, args.host, args.port, ssl=ssl_ctx)
server = loop.run_until_complete(coro)
try:
loop.run_forever()
except OSError:
pass
except KeyboardInterrupt:
server.close()
loop.run_until_complete(server.wait_closed())
finally:
loop.close()
return 0
if __name__ == '__main__':
sys.exit(main())