2015-01-07 04:57:51 +01:00
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#!/usr/bin/env python3
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2019-05-07 12:06:21 +02:00
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"HTTP Proxy utilities, pyOpenSSL version"
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2015-01-07 04:57:51 +01:00
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__author__ = 'phoenix'
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__version__ = '1.0'
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from datetime import datetime
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import logging
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2015-12-11 21:49:48 +01:00
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import threading
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2015-01-07 04:57:51 +01:00
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import cgi
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import socket
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import select
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import ssl
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2019-05-07 12:06:21 +02:00
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2015-01-07 04:57:51 +01:00
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from http.server import HTTPServer, BaseHTTPRequestHandler
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from socketserver import ThreadingMixIn
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2019-05-07 12:06:21 +02:00
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from cert import get_cert
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2015-01-07 04:57:51 +01:00
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2019-05-07 12:06:21 +02:00
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_name = 'proxy'
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2015-01-07 04:57:51 +01:00
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logger = logging.getLogger('__main__')
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2019-05-07 12:06:21 +02:00
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message_format = '''\
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<!doctype html>
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2015-01-07 04:57:51 +01:00
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<html>
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2019-05-07 12:06:21 +02:00
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<head>
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<meta http-equiv="Content-Type" content="text/html;charset=utf-8">
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<title>Proxy Error: {code}</title>
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</head>
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<body>
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<h1>{code}: {message}</h1>
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<p>The following error occurred while
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trying to access <strong>{url}</strong>
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</p>
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<p><strong>{explain}</strong></p>
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<hr>Generated on {now} by {server}.
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</body>
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2015-01-07 04:57:51 +01:00
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</html>
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2019-05-07 12:06:21 +02:00
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'''
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2015-01-07 04:57:51 +01:00
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def read_write(socket1, socket2, max_idling=10):
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2019-05-07 12:06:21 +02:00
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'''
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Read and Write contents between 2 sockets
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'''
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2015-01-07 04:57:51 +01:00
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iw = [socket1, socket2]
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ow = []
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count = 0
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while True:
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count += 1
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(ins, _, exs) = select.select(iw, ow, iw, 1)
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2019-05-07 12:06:21 +02:00
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if exs:
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break
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2015-01-07 04:57:51 +01:00
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if ins:
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for reader in ins:
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writer = socket2 if reader is socket1 else socket1
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try:
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data = reader.recv(1024)
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if data:
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writer.send(data)
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count = 0
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2019-05-07 12:06:21 +02:00
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except (ConnectionAbortedError,
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ConnectionResetError,
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BrokenPipeError):
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2015-01-07 04:57:51 +01:00
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pass
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2019-05-07 12:06:21 +02:00
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if count == max_idling:
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break
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2015-01-07 04:57:51 +01:00
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2015-12-11 21:49:48 +01:00
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class Counter:
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reset_value = 999
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2019-05-07 12:06:21 +02:00
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2015-12-11 21:49:48 +01:00
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def __init__(self, start=0):
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self.lock = threading.Lock()
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self.value = start
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2019-05-07 12:06:21 +02:00
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2015-12-11 21:49:48 +01:00
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def increment_and_set(self, obj, attr):
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with self.lock:
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self.value = self.value + 1 if self.value < self.reset_value else 1
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setattr(obj, attr, self.value)
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2015-01-07 04:57:51 +01:00
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class ProxyRequestHandler(BaseHTTPRequestHandler):
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2019-05-07 12:06:21 +02:00
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'''
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RequestHandler with do_CONNECT method defined
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'''
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server_version = f'{_name}/{__version__}'
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2015-01-07 04:57:51 +01:00
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# do_CONNECT() will set self.ssltunnel to override this
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ssltunnel = False
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# Override default value 'HTTP/1.0'
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protocol_version = 'HTTP/1.1'
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2015-12-11 21:49:48 +01:00
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# To be set in each request
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reqNum = 0
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2015-01-07 04:57:51 +01:00
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def do_CONNECT(self):
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2019-05-07 12:06:21 +02:00
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'''
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Descrypt https request and dispatch to http handler
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'''
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2015-01-07 04:57:51 +01:00
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# request line: CONNECT www.example.com:443 HTTP/1.1
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2019-05-07 12:06:21 +02:00
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self.host, self.port = self.path.split(':')
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2019-05-14 19:47:54 +02:00
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# TLS MITM
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2019-05-07 12:06:21 +02:00
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self.wfile.write(
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('HTTP/1.1 200 Connection established\r\n'
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+ f'Proxy-agent: {self.version_string()}\r\n'
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+ '\r\n').encode('ascii'))
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if self.host.count('.') >= 2:
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commonname = '.' + self.host.partition('.')[-1]
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else:
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commonname = self.host
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dummycert = get_cert(commonname, self.config)
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2015-01-07 04:57:51 +01:00
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# set a flag for do_METHOD
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self.ssltunnel = True
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2019-05-07 12:06:21 +02:00
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ssl_sock = ssl.wrap_socket(self.connection, keyfile=dummycert,
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certfile=dummycert, server_side=True)
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2015-01-07 04:57:51 +01:00
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# Ref: Lib/socketserver.py#StreamRequestHandler.setup()
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self.connection = ssl_sock
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self.rfile = self.connection.makefile('rb', self.rbufsize)
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self.wfile = self.connection.makefile('wb', self.wbufsize)
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# dispatch to do_METHOD()
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self.handle_one_request()
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def handle_one_request(self):
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2019-05-07 12:06:21 +02:00
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'''Catch more exceptions than default
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2015-01-07 04:57:51 +01:00
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Intend to catch exceptions on local side
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Exceptions on remote side should be handled in do_*()
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2019-05-07 12:06:21 +02:00
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'''
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2015-01-07 04:57:51 +01:00
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try:
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BaseHTTPRequestHandler.handle_one_request(self)
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return
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except (ConnectionError, FileNotFoundError) as e:
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2019-05-07 12:06:21 +02:00
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logger.warning('{:03d} {} {}'.format(
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self.reqNum, self.server_version, e))
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2015-01-07 04:57:51 +01:00
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except (ssl.SSLEOFError, ssl.SSLError) as e:
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if hasattr(self, 'url'):
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# Happens after the tunnel is established
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2019-05-07 12:06:21 +02:00
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logger.warning(f'{self.reqNum:03d} "{e}" while operating'
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2019-05-14 19:47:54 +02:00
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f' on established local TSL tunnel for'
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2019-05-07 12:06:21 +02:00
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f' [{self.url}]')
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2015-01-07 04:57:51 +01:00
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else:
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2019-05-07 12:06:21 +02:00
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logger.warning(f'{self.reqNum:03d} "{e}" while trying to'
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2019-05-14 19:47:54 +02:00
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' establish local TLS tunnel for'
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2019-05-07 12:06:21 +02:00
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f'[{self.path}]')
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2015-01-07 04:57:51 +01:00
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self.close_connection = 1
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def sendout_error(self, url, code, message=None, explain=None):
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2019-05-07 12:06:21 +02:00
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'''
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Modified from http.server.send_error() for customized display
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'''
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2015-01-07 04:57:51 +01:00
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try:
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shortmsg, longmsg = self.responses[code]
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except KeyError:
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shortmsg, longmsg = '???', '???'
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if message is None:
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message = shortmsg
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if explain is None:
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explain = longmsg
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2019-05-07 12:06:21 +02:00
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content = message_format.format(
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code=code, message=message,
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explain=explain, url=url,
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now=datetime.today(),
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server=self.server_version)
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2015-01-07 04:57:51 +01:00
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body = content.encode('UTF-8', 'replace')
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self.send_response_only(code, message)
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2019-05-07 12:06:21 +02:00
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self.send_header('Content-Type', self.error_content_type)
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2015-01-07 04:57:51 +01:00
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self.send_header('Content-Length', int(len(body)))
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self.end_headers()
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if self.command != 'HEAD' and code >= 200 and code not in (204, 304):
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self.wfile.write(body)
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def deny_request(self):
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self.send_response_only(403)
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self.send_header('Content-Length', 0)
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self.end_headers()
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def redirect(self, url):
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self.send_response_only(302)
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self.send_header('Content-Length', 0)
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self.send_header('Location', url)
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self.end_headers()
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def forward_to_https_proxy(self):
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2019-05-07 12:06:21 +02:00
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'''
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Forward https request to upstream https proxy
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'''
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logger.debug(f'Using Proxy - {self.proxy}')
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2015-01-07 04:57:51 +01:00
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proxy_host, proxy_port = self.proxy.split('//')[1].split(':')
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server_conn = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
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try:
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server_conn.connect((proxy_host, int(proxy_port)))
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2019-05-07 12:06:21 +02:00
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server_conn.send((
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f'CONNECT {self.path} HTTP/1.1\r\n\r\n').encode('ascii'))
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2015-01-07 04:57:51 +01:00
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server_conn.settimeout(0.1)
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datas = b''
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while True:
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try:
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data = server_conn.recv(4096)
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except socket.timeout:
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break
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if data:
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datas += data
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else:
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break
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server_conn.setblocking(True)
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if b'200' in datas and b'established' in datas.lower():
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2019-05-14 19:47:54 +02:00
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logger.info('{:03d} [P] TLS passthru: https://{}/'.format(
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2019-05-07 12:06:21 +02:00
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self.reqNum, self.path))
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self.wfile.write(('HTTP/1.1 200 Connection established\r\n' +
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'Proxy-agent: {}\r\n\r\n'.format(
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self.version_string()).encode('ascii')))
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2015-01-07 04:57:51 +01:00
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read_write(self.connection, server_conn)
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else:
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2019-05-07 12:06:21 +02:00
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logger.warning('{:03d} Proxy {} failed.'.format(
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self.reqNum, self.proxy))
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2015-01-07 04:57:51 +01:00
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if datas:
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logger.debug(datas)
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self.wfile.write(datas)
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finally:
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2019-05-07 12:06:21 +02:00
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# We don't maintain a connection reuse pool,
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# so close the connection anyway
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2015-01-07 04:57:51 +01:00
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server_conn.close()
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def forward_to_socks5_proxy(self):
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2019-05-07 12:06:21 +02:00
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'''
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Forward https request to upstream socks5 proxy
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'''
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logger.warning('Socks5 proxy not implemented yet, '
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'please use https proxy')
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2015-01-07 04:57:51 +01:00
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def tunnel_traffic(self):
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2019-05-07 12:06:21 +02:00
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'''
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Tunnel traffic to remote host:port
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'''
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2019-05-14 19:47:54 +02:00
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logger.info('{:03d} [D] TLS passthru: https://{}/'.format(
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2019-05-07 12:06:21 +02:00
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self.reqNum, self.path))
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2015-01-07 04:57:51 +01:00
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server_conn = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
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try:
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server_conn.connect((self.host, int(self.port)))
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2019-05-07 12:06:21 +02:00
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self.wfile.write(('HTTP/1.1 200 Connection established\r\n'
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+ 'Proxy-agent: {}\r\n'.format(
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self.version_string())
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+ '\r\n').encode('ascii'))
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2015-01-07 04:57:51 +01:00
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read_write(self.connection, server_conn)
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except TimeoutError:
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2019-05-07 12:06:21 +02:00
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self.wfile.write(b'HTTP/1.1 504 Gateway Timeout\r\n\r\n')
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logger.warning('{:03d} Timed Out: https://{}:{}/'.format(
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self.reqNum, self.host, self.port))
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2015-01-07 04:57:51 +01:00
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except socket.gaierror as e:
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2019-05-07 12:06:21 +02:00
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self.wfile.write(b'HTTP/1.1 503 Service Unavailable\r\n\r\n')
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logger.warning('{:03d} {}: https://{}:{}/'.format(
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self.reqNum, e, self.host, self.port))
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2015-01-07 04:57:51 +01:00
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finally:
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2019-05-07 12:06:21 +02:00
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# We don't maintain a connection reuse pool,
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# so close the connection anyway
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2015-01-07 04:57:51 +01:00
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server_conn.close()
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def ssl_get_response(self, conn):
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try:
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2019-05-07 12:06:21 +02:00
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server_conn = ssl.wrap_socket(
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conn, cert_reqs=ssl.CERT_REQUIRED,
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ca_certs="cacert.pem",
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ssl_version=ssl.PROTOCOL_TLSv1)
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server_conn.sendall(
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('{} {} HTTP/1.1\r\n'.format(
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self.command, self.path)).encode('ascii'))
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2015-01-07 04:57:51 +01:00
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server_conn.sendall(self.headers.as_bytes())
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if self.postdata:
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server_conn.sendall(self.postdata)
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while True:
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data = server_conn.recv(4096)
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if data:
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self.wfile.write(data)
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2019-05-07 12:06:21 +02:00
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else:
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break
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2015-01-07 04:57:51 +01:00
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except (ssl.SSLEOFError, ssl.SSLError) as e:
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2019-05-07 12:06:21 +02:00
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logger.error("[SSLError]")
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self.send_error(417, message="Exception "
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+ str(e.__class__), explain=str(e))
|
2015-01-07 04:57:51 +01:00
|
|
|
|
|
|
|
|
def purge_headers(self, headers):
|
2019-05-07 12:06:21 +02:00
|
|
|
'''
|
|
|
|
|
Remove hop-by-hop headers that shouldn't pass through a Proxy
|
|
|
|
|
'''
|
|
|
|
|
for name in ['Connection', 'Keep-Alive', 'Upgrade',
|
|
|
|
|
'Proxy-Connection', 'Proxy-Authenticate']:
|
2015-01-07 04:57:51 +01:00
|
|
|
del headers[name]
|
|
|
|
|
|
2015-12-11 21:49:48 +01:00
|
|
|
def purge_write_headers(self, headers):
|
2015-01-07 04:57:51 +01:00
|
|
|
self.purge_headers(headers)
|
|
|
|
|
for key, value in headers.items():
|
|
|
|
|
self.send_header(key, value)
|
|
|
|
|
self.end_headers()
|
2019-05-07 12:06:21 +02:00
|
|
|
|
2015-01-07 04:57:51 +01:00
|
|
|
def stream_to_client(self, response):
|
|
|
|
|
bufsize = 1024 * 64
|
|
|
|
|
need_chunked = 'Transfer-Encoding' in response.headers
|
|
|
|
|
written = 0
|
|
|
|
|
while True:
|
|
|
|
|
data = response.read(bufsize)
|
|
|
|
|
if not data:
|
|
|
|
|
if need_chunked:
|
|
|
|
|
self.wfile.write(b'0\r\n\r\n')
|
|
|
|
|
break
|
|
|
|
|
if need_chunked:
|
2019-05-07 12:06:21 +02:00
|
|
|
self.wfile.write((f'{len(data):x}\r\n').encode('ascii'))
|
2015-01-07 04:57:51 +01:00
|
|
|
self.wfile.write(data)
|
|
|
|
|
if need_chunked:
|
|
|
|
|
self.wfile.write(b'\r\n')
|
|
|
|
|
written += len(data)
|
|
|
|
|
return written
|
2019-05-07 12:06:21 +02:00
|
|
|
|
2015-01-07 04:57:51 +01:00
|
|
|
def http_request_info(self):
|
2019-05-07 12:06:21 +02:00
|
|
|
'''
|
|
|
|
|
Return HTTP request information in bytes
|
|
|
|
|
'''
|
|
|
|
|
context = ['CLIENT VALUES:',
|
|
|
|
|
f'client_address = {self.client_address}',
|
|
|
|
|
f'requestline = {self.requestline}',
|
|
|
|
|
f'command = {self.command}',
|
|
|
|
|
f'path = {self.path}',
|
|
|
|
|
f'request_version = {self.request_version}',
|
|
|
|
|
'',
|
|
|
|
|
'SERVER VALUES:',
|
|
|
|
|
'server_version = {self.server_version}',
|
|
|
|
|
'sys_version = {self.sys_version}',
|
|
|
|
|
'protocol_version = {self.protocol_version}',
|
|
|
|
|
'',
|
|
|
|
|
'HEADER RECEIVED:']
|
2015-01-07 04:57:51 +01:00
|
|
|
for name, value in sorted(self.headers.items()):
|
2019-05-07 12:06:21 +02:00
|
|
|
context.append(f'{name} = {value.rstrip()}')
|
2015-01-07 04:57:51 +01:00
|
|
|
|
2019-05-07 12:06:21 +02:00
|
|
|
if self.command == 'POST':
|
|
|
|
|
context.append('\r\nPOST VALUES:')
|
2015-01-07 04:57:51 +01:00
|
|
|
form = cgi.FieldStorage(fp=self.rfile,
|
|
|
|
|
headers=self.headers,
|
|
|
|
|
environ={'REQUEST_METHOD': 'POST'})
|
|
|
|
|
for field in form.keys():
|
|
|
|
|
fielditem = form[field]
|
|
|
|
|
if fielditem.filename:
|
|
|
|
|
# The field contains an uploaded file
|
|
|
|
|
file_data = fielditem.file.read()
|
|
|
|
|
file_len = len(file_data)
|
2019-05-07 12:06:21 +02:00
|
|
|
context.append('Uploaded {} as "{}" ({} bytes)'.format(
|
|
|
|
|
field, fielditem.filename, file_len))
|
2015-01-07 04:57:51 +01:00
|
|
|
else:
|
|
|
|
|
# Regular form value
|
2019-05-07 12:06:21 +02:00
|
|
|
context.append(f'{field} = {fielditem.value}')
|
|
|
|
|
|
|
|
|
|
return('\r\n'.join(context).encode('ascii'))
|
|
|
|
|
|
2015-01-07 04:57:51 +01:00
|
|
|
|
|
|
|
|
def demo():
|
|
|
|
|
PORT = 8000
|
|
|
|
|
|
|
|
|
|
class ProxyServer(ThreadingMixIn, HTTPServer):
|
2019-05-07 12:06:21 +02:00
|
|
|
'''Handle requests in a separate thread.'''
|
2015-01-07 04:57:51 +01:00
|
|
|
pass
|
|
|
|
|
|
|
|
|
|
class RequestHandler(ProxyRequestHandler):
|
2019-05-07 12:06:21 +02:00
|
|
|
'Displaying HTTP request information'
|
|
|
|
|
server_version = 'DemoProxy/0.1'
|
2015-01-07 04:57:51 +01:00
|
|
|
|
|
|
|
|
def do_METHOD(self):
|
2019-05-07 12:06:21 +02:00
|
|
|
'Universal method for GET, POST, HEAD, PUT and DELETE'
|
2015-01-07 04:57:51 +01:00
|
|
|
message = self.http_request_info()
|
|
|
|
|
self.send_response(200)
|
|
|
|
|
# 'Content-Length' is important for HTTP/1.1
|
|
|
|
|
self.send_header('Content-Length', len(message))
|
|
|
|
|
self.end_headers()
|
|
|
|
|
self.wfile.write(message)
|
|
|
|
|
|
2019-05-07 12:06:21 +02:00
|
|
|
do_GET = do_POST = do_HEAD = do_METHOD
|
|
|
|
|
do_PUT = do_DELETE = do_OPTIONS = do_METHOD
|
2015-01-07 04:57:51 +01:00
|
|
|
|
2019-05-07 12:06:21 +02:00
|
|
|
print(RequestHandler.server_version, 'serving now, <Ctrl-C> to stop ...')
|
|
|
|
|
print(f'Listen Addr : localhost:{PORT}')
|
|
|
|
|
print('-' * 10)
|
2015-01-07 04:57:51 +01:00
|
|
|
server = ProxyServer(('', PORT), RequestHandler)
|
|
|
|
|
server.serve_forever()
|
|
|
|
|
|
2019-05-07 12:06:21 +02:00
|
|
|
|
2015-01-07 04:57:51 +01:00
|
|
|
if __name__ == '__main__':
|
|
|
|
|
try:
|
|
|
|
|
demo()
|
|
|
|
|
except KeyboardInterrupt:
|
2019-05-07 12:06:21 +02:00
|
|
|
print('Quitting...')
|
