[netty-users] Netty and UDP (looking for help with UDP)

[Trustin Lee]

Hi Imagenesis,

Netty doesn't support UDP yet at this moment unfortunately, and I think
your question is not related with Netty IMHO.

On Mon, Nov 10, 2008 at 11:28:51AM +0900, imagenesis wrote:
> 
> Okay, so I started writing my app and then checked out the Quake engine and
> all the big real time games are apparently using the UDP protocol.
> Personally, I don't see all that much point in the header of the protocol
> since the protocol is simply the header but w/e. 
> 
> Anyway, I have a few questions and this seems like a good place to ask since
> you guys probably know a lot about networking. I'm just trying to be
> standards compliant... so here goes. 
> 
> 1) Does it matter what checksum algorithm we use for the checksum? What
> would you recommend. Since it's not really for security what would be the
> fastest?
> 2) I've looked at both the RFC and the wikipedia entry and some basic
> implementation in Perl but I can't figure out what the actual syntax is.
> Specifically what characters(s) do use for the message terminations and what
> do use for the seperation of the values in the header (\0, \n?)? 
> 
> Here is some C++ code that the wikipedia entry uses as an example for the
> client? How the hell is this an implementation of UDP again? Where is the
> checksum being sent? Where is the the size of the message being sent?
> Granted my C++ is pretty much non-existant, but still it doesn't make much
> sense. Thanks!
> 
> int main()
> {
>     // Initiate use of the WinSock DLL.
>     WSADATA wsaData = { 0 };
>     WSAStartup( MAKEWORD( 2, 2 ), &wsaData );
>  
>     // Create a socket and store the handle to it.
>     SOCKET hSocket = socket( AF_INET, SOCK_DGRAM, IPPROTO_UDP );
>  
>     // Set the protocol, port, and address information of the server.
>     sockaddr_in serverAddr = { 0 };
>     serverAddr.sin_family = AF_INET;
>     serverAddr.sin_port = htons( 2345 );
>     serverAddr.sin_addr.s_addr = inet_addr( "127.0.0.1" );
>  
>     // Send a message to the server
>     char buffer[] = "hello";
>     sendto( hSocket, buffer, sizeof( buffer ) + 1, 0,
> reinterpret_cast<sockaddr *>( &serverAddr ), sizeof( serverAddr ) );
>  
>     // Cleanup.
>     WSACleanup();
>  
>     return 0;
> }
> 
> 
> 
 
-- 
Trustin Lee, Principal Software Engineer, JBoss, a division of Red Hat
--
what we call human nature is actually human habit
--
http://gleamynode.net/
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