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As was explained in 2 when we discussed UDP, the IP address that you pair with a port number when you perform a bind() operation tells the operating system which network interfaces you are willing to receive connections from. The example invocations of Listing 3 1 used the localhost IP address 127.0.0.1, which protects your code from connections originating on other machines. You can verify this by running Listing 3 1 in server mode as shown previously, and trying to connect with a client from another machine: $ python tcp_sixteen.py client 192.168.5.130 Traceback (most recent call last): ... socket.error: [Errno 111] Connection refused You will see that the server Python code does not even react; the operating system does not even inform it that an incoming connection to its port was refused. (Note that if you have a firewall running on your machine, the client might just hang when it tries connecting, rather than getting a friendly Connection refused that tells it what is going on!) But if you run the server with an empty string for the hostname, which tells the Python bind() routine that you are willing to accept connections through any of your machine s active network interfaces, then the client can connect successfully from another host (the empty string is supplied by giving the shell these two double-quotes at the end of the command line): $ python tcp_sixteen.py server "" Listening at ('0.0.0.0', 1060) We have accepted a connection from ('192.168.5.10', 46090) Socket connects ('192.168.5.130', 1060) and ('192.168.5.10', 46090) The incoming sixteen-octet message says 'Hi there, server' Reply sent, socket closed Listening at ('0.0.0.0', 1060)
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CHAPTER 3 TCP
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As before, my operating system uses the special IP address 0.0.0.0 to mean accept connections on any interface, but that may vary with operating system, and Python hides this fact by letting you use the empty string instead.
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Deadlock
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The term deadlock is used for all sorts of situations in computer science where two programs, sharing limited resources, can wind up waiting on each other forever because of poor planning. It turns out that it can happen fairly easily when using TCP. I mentioned previously that typical TCP stacks use buffers, both so that they have somewhere to place incoming packet data until an application is ready to read it, and so that they can collect outgoing data until the network hardware is ready to transmit an outgoing packet. These buffers are typically quite limited in size, and the system is not generally willing to let programs fill all of RAM with unsent network data. After all, if the remote end is not yet ready to process the data, it makes little sense to expend system resources on the generating end trying to produce more of it. This limitation will generally not trouble you if you follow the client-server pattern shown in Listing 3 1, where each end always reads its partner s complete message before turning around and sending data in the other direction. But you can run into trouble very quickly if you design a client and server that leave too much data waiting without having some arrangement for promptly reading it. Take a look at Listing 3 2 for an example of a server and client that try to be a bit too clever without thinking through the consequences. Here, the server author has done something that is actually quite intelligent. His job is to turn an arbitrary amount of text into uppercase. Recognizing that its client s requests can be arbitrarily large, and that one could run out of memory trying to read an entire stream of input before trying to process it, the server reads and processes small blocks of 1,024 bytes at a time. Listing 3 2. TCP Server and Client That Deadlock #!/usr/bin/env python # Foundations of Python Network Programming - 3 - tcp_deadlock.py # TCP client and server that leave too much data waiting import socket, sys s = socket.socket(socket.AF_INET, socket.SOCK_STREAM) HOST = '127.0.0.1' PORT = 1060 if sys.argv[1:] == ['server']: s.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1) s.bind((HOST, PORT)) s.listen(1) while True: print 'Listening at', s.getsockname() sc, sockname = s.accept() print 'Processing up to 1024 bytes at a time from', sockname n = 0 while True: message = sc.recv(1024) if not message: break sc.sendall(message.upper()) # send it back uppercase n += len(message)
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