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CHAPTER 2 UDP
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else: print >>sys.stderr, 'usage: udp_broadcast.py server' print >>sys.stderr, ' or: udp_broadcast.py client <host>' sys.exit(2) When trying this server and client out, the first thing you should notice is they behave exactly like a normal client and server if you simply use the client to send packets that are addressed to the IP address of a particular server. Turning on broadcast for a UDP socket does not disable or change its normal ability to send and receive specifically addressed packets. The magic happens when you view the settings for your local network, and use its IP broadcast address as the destination for the client. First bring up one or two servers on your network, using commands like the following: $ python udp_broadcast.py server Listening for broadcasts at ('0.0.0.0', 1060) Then, while they are running, first use the client to send messages to each server. You will see that only one server gets each message: $ python udp_broadcast.py client 192.168.5.10 But when you use the local network s broadcast address, suddenly you will see that all of the broadcast servers get the packet at the same time! (But no normal servers will see it run a few copies of the normal udp_remote.py server while making broadcasts to be convinced!) On my local network at the moment, the ifconfig command tells me that the broadcast address is this: $ python udp_broadcast.py client 192.168.5.255 And, sure enough, both servers immediately report that they see the message! In case your operating system makes it difficult to determine the broadcast address, and you do not mind doing a broadcast out of every single network port of your host, Python lets you use the special hostname '<broadcast>' when sending with a UDP socket. Be careful to quote that name when passing it to our client, since the < and > characters are quite special to any normal POSIX shell: $ python udp_broadcast.py client "<broadcast>" If there were any platform-independent way to learn each connected subnet and its broadcast address, I would show you; but unfortunately you will have to consult your own operating system documentation if you want to do anything more specific than use this special '<broadcast>' string.
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When to Use UDP
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You might think that UDP would be very efficient for sending small messages. Actually, UDP is efficient only if your host ever only sends one message at a time, then waits for a response. If your application might send several messages in a burst, then using an intelligent message queue algorithm like MQ will actually be more efficient because it will set a short timer that lets it bundle several small messages together to send them over a single round-trip to the server, probably on a TCP connection that does a much better job of splitting the payload into fragments than you would! There are two good reasons to use UDP: Because you are implementing a protocol that already exists, and it uses UDP Because unreliable subnet broadcast is a great pattern for your application, and UDP supports it perfectly
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CHAPTER 2 UDP
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Outside of these two situations, you should probably look at later chapters of this book for inspiration about how to construct the communication for your application.
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Summary
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The User Data Protocol, UDP, lets user-level programs send individual packets across an IP network. Typically, a client program sends a packet to a server, which then replies back using the return address built into every UDP packet. The POSIX network stack gives you access to UDP through the idea of a socket, which is a communications endpoint that can sit at an IP address and UDP port number these two things together are called the socket s name and send and receive UDP packets. These primitive network operations are offered by Python through the built-in socket module. The server needs to bind() to an address and port before it can receive incoming packets. Client UDP programs can just start sending, and the operating system will choose a port number for them automatically. Since UDP is built atop the actual behavior of network packets, it is unreliable: packets can be dropped either because of a glitch on a network transmission medium, or because a network segment becomes too busy. Clients have to compensate for this by being willing to re-transmit a request until they receive a reply. To prevent making a busy network even worse, clients should use exponential backoff as they encounter repeated failure, and should also make their initial wait time longer if they find that round-trips to the server are simply taking longer than their author expected. Request IDs are crucial to combat the problem of reply duplication, where a reply you thought was lost arrives later after all and could be mistaken for the reply to your current question. If randomly chosen, request IDs can also help protect against naive spoofing attacks. When using sockets, it is important to distinguish the act of binding by which you grab a particular UDP port for the use of a particular socket from the act that the client performs by connecting, which limits all replies received so that they can come only from the particular server to which you want to talk. Among the socket options available for UDP sockets, the most powerful is broadcast, which lets you send packets to every host on your subnet without having to send to each host individually. This can help when programming local LAN games or other cooperative computation, and is one of the few reasons that you would select UDP for new applications.
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