Help with sockets!

[Michael David WINIKOFF]

Hi!

I've started tinkering with sockets in Python and have the following
modified version of the example program in the library docs.

This is intended to forward everything from a port on one machine to
a telnet port on another machine.

The program works fine except that when I terminate the connection the
socket remains in use:

prompt% ./redir
Listening for connections on X port 60016
Connected by ('X.X.X.X', 62268)
Forwarding to 23 on X
Closing connections. Bye.
prompt%
prompt% ./redir
Listening for connections on X port 60016
Traceback (innermost last):
  File "./redir", line 16, in ?
    s.bind(FORWARD, PORT)
socket.error: (125, 'Address already in use')

Any ideas why this isn't working? The sockets are being closed before
the program terminates.

Thanks,

Michael


--- CUT HERE ---
#!/usr/local/bin/python
# Echo server (p143 Python lib man)
from socket import *
import select
# from select import *

def sock_avail(x):
        """Test whether data is available on the socket."""
        return select.select([x], [], [], 0) == ([x], [], [])

FORWARD = 'host1'
DEST = 'host2'
PORT = 60016
print 'Listening for connections on', FORWARD, 'port', PORT
s = socket(AF_INET, SOCK_STREAM)
s.bind(FORWARD, PORT)
s.listen(1)
conn, addr = s.accept()
print 'Connected by', addr
try:
        s1 = socket(AF_INET, SOCK_STREAM)
        s1.connect(DEST,23) # telnet port
        print 'Forwarding to 23 on', DEST
        while 1:
                if sock_avail(conn):
                        data = conn.recv(1024)
                        s1.send(data)
                if sock_avail(s1):
                        data = s1.recv(1024)
                        conn.send(data)
except error:
        s.close()
        conn.close()
        s1.close()
        print 'Closing connections. Bye.'