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#!/usr/bin/env python
#
# Simple asynchronous HTTP proxy with tunnelling (CONNECT).
#
# GET/POST proxying based on
# http://groups.google.com/group/python-tornado/msg/7bea08e7a049cf26
#
# Copyright (C) 2012 Senko Rasic <senko.rasic@dobarkod.hr>
#
# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"), to deal
# in the Software without restriction, including without limitation the rights
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice shall be included in
# all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
# THE SOFTWARE.
import socket
import ssl
import sys
import tornado.gen
import tornado.httpclient
import tornado.httpserver
import tornado.ioloop
import tornado.iostream
import tornado.web
__all__ = ["ProxyHandler", "run_proxy"]
class ProxyHandler(tornado.web.RequestHandler):
SUPPORTED_METHODS = ["GET", "POST", "CONNECT"]
@tornado.gen.coroutine
def get(self):
def handle_response(response):
if response.error and not isinstance(
response.error, tornado.httpclient.HTTPError
):
self.set_status(500)
self.write("Internal server error:\n" + str(response.error))
self.finish()
else:
self.set_status(response.code)
for header in (
"Date",
"Cache-Control",
"Server",
"Content-Type",
"Location",
):
v = response.headers.get(header)
if v:
self.set_header(header, v)
if response.body:
self.write(response.body)
self.finish()
upstream_ca_certs = self.application.settings.get("upstream_ca_certs", None)
ssl_options = None
if upstream_ca_certs:
ssl_options = ssl.create_default_context(cafile=upstream_ca_certs)
req = tornado.httpclient.HTTPRequest(
url=self.request.uri,
method=self.request.method,
body=self.request.body,
headers=self.request.headers,
follow_redirects=False,
allow_nonstandard_methods=True,
ssl_options=ssl_options,
)
client = tornado.httpclient.AsyncHTTPClient()
try:
response = yield client.fetch(req)
yield handle_response(response)
except tornado.httpclient.HTTPError as e:
if hasattr(e, "response") and e.response:
yield handle_response(e.response)
else:
self.set_status(500)
self.write("Internal server error:\n" + str(e))
self.finish()
@tornado.gen.coroutine
def post(self):
yield self.get()
@tornado.gen.coroutine
def connect(self):
host, port = self.request.uri.split(":")
client = self.request.connection.stream
@tornado.gen.coroutine
def start_forward(reader, writer):
while True:
try:
data = yield reader.read_bytes(4096, partial=True)
except tornado.iostream.StreamClosedError:
break
if not data:
break
writer.write(data)
writer.close()
s = socket.socket(socket.AF_INET, socket.SOCK_STREAM, 0)
upstream = tornado.iostream.IOStream(s)
yield upstream.connect((host, int(port)))
client.write(b"HTTP/1.0 200 Connection established\r\n\r\n")
fu1 = start_forward(client, upstream)
fu2 = start_forward(upstream, client)
yield [fu1, fu2]
def run_proxy(port, start_ioloop=True):
"""
Run proxy on the specified port. If start_ioloop is True (default),
the tornado IOLoop will be started immediately.
"""
app = tornado.web.Application([(r".*", ProxyHandler)])
app.listen(port)
ioloop = tornado.ioloop.IOLoop.instance()
if start_ioloop:
ioloop.start()
if __name__ == "__main__":
port = 8888
if len(sys.argv) > 1:
port = int(sys.argv[1])
print("Starting HTTP proxy on port %d" % port)
run_proxy(port)
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