1  #!/usr/bin/env python3
       2  
       3  """
       4  Remote python server.
       5  Execute Python commands remotely and send output back.
       6  
       7  WARNING: This version has a gaping security hole -- it accepts requests
       8  from any host on the internet!
       9  """
      10  
      11  import sys
      12  from socket import socket, AF_INET, SOCK_STREAM
      13  import io
      14  import traceback
      15  
      16  PORT = 4127
      17  BUFSIZE = 1024
      18  
      19  def main():
      20      if len(sys.argv) > 1:
      21          port = int(sys.argv[1])
      22      else:
      23          port = PORT
      24      s = socket(AF_INET, SOCK_STREAM)
      25      s.bind(('', port))
      26      s.listen(1)
      27      while True:
      28          conn, (remotehost, remoteport) = s.accept()
      29          with conn:
      30              print('connection from', remotehost, remoteport)
      31              request = b''
      32              while True:
      33                  data = conn.recv(BUFSIZE)
      34                  if not data:
      35                      break
      36                  request += data
      37              reply = execute(request.decode())
      38              conn.send(reply.encode())
      39  
      40  def execute(request):
      41      stdout = sys.stdout
      42      stderr = sys.stderr
      43      sys.stdout = sys.stderr = fakefile = io.StringIO()
      44      try:
      45          try:
      46              exec(request, {}, {})
      47          except:
      48              print()
      49              traceback.print_exc(100)
      50      finally:
      51          sys.stderr = stderr
      52          sys.stdout = stdout
      53      return fakefile.getvalue()
      54  
      55  try:
      56      main()
      57  except KeyboardInterrupt:
      58      pass