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# Ignore everything in this directory it is just essential to store cloud images¿ | ||
* | ||
# Except this file | ||
!.gitignore |
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#!/usr/bin/env python3 | ||
# Tcp Port Forwarding (Reverse Proxy) | ||
# | ||
# For link-local IPv6 address, such as router emergency recovery, etc. | ||
# Workaround for https://stackoverflow.com/questions/45299648/how-to-access-devices-with-ipv6-link-local-address-from-browserlike-ie-firefox | ||
# | ||
# Usage: python3 forward.py --listen-host 127.0.0.1 --listen-port 8443 --connect-host 'fe80::abcd:abcd:beef:beef%enp0s0' --connect-port 443 | ||
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import socket | ||
import threading | ||
import argparse | ||
import logging | ||
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format = '%(asctime)s - %(filename)s:%(lineno)d - %(levelname)s: %(message)s' | ||
logging.basicConfig(level=logging.INFO, format=format) | ||
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def transfer(src, dst, direction): | ||
while True: | ||
try: | ||
buffer = src.recv(4096) | ||
if len(buffer) > 0: | ||
dst.send(buffer) | ||
except Exception as e: | ||
logging.error(repr(e)) | ||
break | ||
src.close() | ||
dst.close() | ||
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def server(local_host, local_port, remote_host, remote_port, ipv6=False): | ||
server_socket = socket.socket(socket.AF_INET, socket.SOCK_STREAM) | ||
server_socket.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1) | ||
server_socket.bind((local_host, local_port)) | ||
server_socket.listen(0x40) | ||
logging.info(f"Server started {local_host, local_port}") | ||
logging.info(f"Connect to {local_host, local_port} to get the content of {remote_host, remote_port}") | ||
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# From https://stackoverflow.com/a/4030559/13843585 | ||
inet_type = socket.AF_INET6 if ipv6 else socket.AF_INET | ||
addrinfo = socket.getaddrinfo(remote_host, remote_port, inet_type, socket.SOCK_STREAM) | ||
logging.info(f"dst addrinfo {addrinfo}") | ||
(family, socktype, proto, canonname, sockaddr) = addrinfo[0] | ||
while True: | ||
src_socket, src_address = server_socket.accept() | ||
logging.info(f"[Establishing] {src_address} -> {local_host, local_port} -> ? -> {remote_host, remote_port}") | ||
try: | ||
dst_socket = socket.socket(family, socktype, proto) | ||
dst_socket.connect(sockaddr) | ||
logging.info(f"[OK] {src_address} -> {local_host, local_port} -> {dst_socket.getsockname()} -> {remote_host, remote_port}") | ||
s = threading.Thread(target=transfer, args=(dst_socket, src_socket, False)) | ||
r = threading.Thread(target=transfer, args=(src_socket, dst_socket, True)) | ||
s.start() | ||
r.start() | ||
except Exception as e: | ||
logging.error(repr(e)) | ||
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def main(): | ||
parser = argparse.ArgumentParser() | ||
parser.add_argument("--listen-host", help="the host to listen", required=True) | ||
parser.add_argument("--listen-port", type=int, help="the port to bind", required=True) | ||
parser.add_argument("--connect-host", help="the target host to connect", required=True) | ||
parser.add_argument("--connect-port", type=int, help="the target port to connect", required=True) | ||
parser.add_argument("--ipv6", type=bool, help="whether destination host is ipv6", default=True) | ||
args = parser.parse_args() | ||
server(args.listen_host, args.listen_port, | ||
args.connect_host, args.connect_port, args.ipv6) | ||
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if __name__ == "__main__": | ||
main() |