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#!/usr/bin/env python3
# Examples:
#
# Original server that doesn't use SSL:
# ./proxy.py 8080 imap.nauta.cu 143
# ./proxy.py 8081 smtp.nauta.cu 25
#
# Original server that uses SSL:
# ./proxy.py 8080 testrun.org 993 --ssl
# ./proxy.py 8081 testrun.org 465 --ssl
from datetime import datetime
import argparse
import selectors
import ssl
import socket
import socketserver
class Proxy(socketserver.ThreadingTCPServer):
allow_reuse_address = True
def __init__(self, proxy_host, proxy_port, real_host, real_port, use_ssl):
self.real_host = real_host
self.real_port = real_port
self.use_ssl = use_ssl
super().__init__((proxy_host, proxy_port), RequestHandler)
class RequestHandler(socketserver.BaseRequestHandler):
def handle(self):
print('{} - {} CONNECTED.'.format(datetime.now(), self.client_address))
total = 0
real_server = (self.server.real_host, self.server.real_port)
with socket.create_connection(real_server) as sock:
if self.server.use_ssl:
context = ssl.create_default_context()
sock = context.wrap_socket(
sock, server_hostname=real_server[0])
forward = {self.request: sock, sock: self.request}
sel = selectors.DefaultSelector()
sel.register(self.request, selectors.EVENT_READ,
self.client_address)
sel.register(sock, selectors.EVENT_READ, real_server)
active = True
while active:
events = sel.select()
for key, mask in events:
print('\n{} - {} wrote:'.format(datetime.now(), key.data))
data = key.fileobj.recv(1024)
received = len(data)
total += received
print(data)
print('{} Bytes\nTotal: {} Bytes'.format(received, total))
if data:
forward[key.fileobj].sendall(data)
else:
print('\nCLOSING CONNECTION.\n\n')
forward[key.fileobj].close()
key.fileobj.close()
active = False
if __name__ == '__main__':
p = argparse.ArgumentParser(description='Simple Python Proxy')
p.add_argument(
"proxy_port", help="the port where the proxy will listen", type=int)
p.add_argument('host', help="the real host")
p.add_argument('port', help="the port of the real host", type=int)
p.add_argument("--ssl", help="use ssl to connect to the real host",
action="store_true")
args = p.parse_args()
with Proxy('', args.proxy_port, args.host, args.port, args.ssl) as proxy:
proxy.serve_forever()
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