#!/usr/bin/env python3

"""
Remote python server.
Execute Python commands remotely and send output back.

WARNING: This version has a gaping security hole -- it accepts requests
from any host on the Internet!
"""

import sys
from socket import socket, AF_INET, SOCK_STREAM
import io
import traceback

PORT = 4127
BUFSIZE = 1024

def main():
 if len(sys.argv) > 1:
 port = int(sys.argv[1])
 else:
 port = PORT
 s = socket(AF_INET, SOCK_STREAM)
 s.bind(('', port))
 s.listen(1)
 while True:
 conn, (remotehost, remoteport) = s.accept()
 print('connection from', remotehost, remoteport)
 request = b''
 while 1:
 data = conn.recv(BUFSIZE)
 if not data:
 break
 request += data
 reply = execute(request.decode())
 conn.send(reply.encode())
 conn.close()

def execute(request):
 stdout = sys.stdout
 stderr = sys.stderr
 sys.stdout = sys.stderr = fakefile = io.StringIO()
 try:
 try:
 exec(request, {}, {})
 except:
 print()
 traceback.print_exc(100)
 finally:
 sys.stderr = stderr
 sys.stdout = stdout
 return fakefile.getvalue()

try:
 main()
except KeyboardInterrupt:
 pass