Beej’s Guide to Network Programming Using Internet Sockets by Brian “Beej Jorgensen” Hall

By Brian “Beej Jorgensen” Hall

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By Brian “Beej Jorgensen” Hall

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Since every machine on the LAN will be forced to deal with the packet whether it recvfrom()s it or not, it can present quite a load to the entire computing network. They are definitely to be used sparingly and appropriately. Beej’s Guide to Network Programming Using Internet Sockets 36 7. Common Questions Where can I get those header files? If you don’t have them on your system already, you probably don’t need them. Check the manual for your particular platform. h>. What do I do when bind() reports “Address already in use”?

For one thing, you can still often connect() through the firewall if it’s doing some kind of masquerading or NAT or something like that. Just design your programs so that you’re always the one initiating the connection, and you’ll be fine. If that’s not satisfactory, you can ask your sysadmins to poke a hole in the firewall so that people can connect to you. The firewall can forward to you either through it’s NAT software, or through a proxy or something like that. Be aware that a hole in the firewall is nothing to be taken lightly.

Well, here’s the second of the one-two punch: you might have read past the end of one packet and onto the next in a single recv() call. That is, you have a work buffer with one complete packet, and an incomplete part of the next packet! Bloody heck. ) Since you know the length of the first packet from the header, and you’ve been keeping track of the number of bytes in the work buffer, you can subtract and calculate how many of the bytes in the work buffer belong to the second (incomplete) packet.

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