[gameprogrammer] Re: "Network Byte Order" IP's to dotted-triplet format

Rock. On. This game is going to be so sweet :)

Bob Pendleton wrote:

>On Wed, 2004-11-10 at 14:58, Jake The Snake Briggs wrote:
>  
>
>>Hi all
>>I need to get the IP address of a socket. I am writing a multiplayer 
>>game, basicly its "snake", but multiplayer. I want to write 3 programs, 
>>a client game, a server, and a master server. I want to be able to tell 
>>the master server to give me a list of all the game servers that are 
>>registered with it. So far i have a crappy game server written, that can 
>>register with the master server. I have a really crappy game client 
>>written. I have the simple master sever 95% finished, and thats where my 
>>problem lies.
>>I am using this function :
>>
>>IPaddress *NET2_TCPGetPeerAddress(int socket);
>>
>>because i am using Bob Pendletons NET2_SDL library. This fills the 
>>specified IPaddress struct with the IP and Port of the socket in 
>>"Network Byte Order" format. So i think (after a bit of googleing) i 
>>understand what that is, and why its used.
>>At the moment i can go
>>telnet <masterserverip> <masterserverport>
>>then type
>>"servers"
>>and i get back a list of server ip's and ports. But I want them to be 
>>the dotted triplet format, like 192.168.0.2 rather than 18328373673 or 
>>whatever it is. How would one go about transforming Network Byte Order 
>>to dotted format?
>>    
>>
>
>The content of the host item in the IPaddress structure is just an
>unsigned integer. First, convert it to host order using ntohl(). Then
>assuming the value is in "a" you use something like:
>
>printf("%d.%d.%d.%d\n", (a >> 24) & 0xff,
>                       (a >> 16) & 0xff, 
>                        (a >> 8) & 0xff, 
>                        a & 0xff);
>
>And, yeah, all the OxFF constants are need. Never trust the compiler not
>to fill in high order 1s when shifting left.
>
>               Bob Pendleton
>
>  
>
>>
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>>    
>>



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