I'm working on a bit of a project in python. I have a client and a server. The server listens for connections and once a connection is received it waits for input from the client. The idea is that the client can connect to the server and execute system commands such as ls and cat. This is my server code:

import sys, os, sockethost = ''                
port = 50105s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
s.bind((host, port))
print("Server started on port: ", port)s.listen(5)
print("Server listening\n")
conn, addr = s.accept()
print 'New connection from ', addr
while (1):rc = conn.recv(5)pipe = os.popen(rc)rl = pipe.readlines()file = conn.makefile('w', 0)file.writelines(rl[:-1])file.close()conn.close()

And this is my client code:

import sys, socket
s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
host = 'localhost'
port = input('Port: ')
s.connect((host, port))
cmd = raw_input('$ ')
s.send(cmd) 
file = s.makefile('r', 0)
sys.stdout.writelines(file.readlines())

When I start the server I get the right output, saying the server is listening. But when I connect with my client and type a command the server exits with this error:

Traceback (most recent call last):
File "server.py", line 21, in <module>rc = conn.recv(2)
File "/usr/lib/python2.6/socket.py", line 165, in _dummyraise error(EBADF, 'Bad file descriptor')
socket.error: [Errno 9] Bad file descriptor

On the client side, I get the output of ls but the server gets screwed up.

Your code calls conn.close() and then loops back around to conn.recv(), but conn is already closed.