klein fabien wrote:
> OK ,I removed the bind call because I allways received the same
> message :
>
> Cannot assign requested address
>
> here is the bind call
>
>
> ....
> Destination.sin_family = AF_INET;
> //Destination.sin_addr.s_addr = 0xC7215111;
> Destination.sin_addr.s_addr = 0xC621518B;
> Destination.sin_port = htons (TEST_PORT);
>
> //
> //Open a socket
> //
> Socket = socket(AF_INET,SOCK_DGRAM,IPPROTO_UDP);
> if (Socket < 0)
> {
> printf("socket Error %d\n",Socket);
> return 0;
> }
> if(bind(Socket,&Destination,sizeof(Destination))==-1)
> {
> perror("bind");
> exit(1)
> }
> ......
>
> idem for the other program
>
> what is wrong???
You have to specify either a *local* IP address, or the constant
INADDR_ANY. E.g.
Local.sin_family = AF_INET;
Local.sin_addr.s_addr = INADDR_ANY;
Local.sin_port = htons(TEST_PORT);
if (bind(Socket, &Local, sizeof(Local)) < 0)
{
perror("bind");
exit(1)
}
will cause the socket to use TEST_PORT instead of a randomly-allocated
port number.
You can specify a specific *local* IP address for the sin_addr field,
in which case it will only accept packets destined for that specific
address. If you use INADDR_ANY, it will accept packets destined for
any address.
The main reason for using a specific IP address is for virtual-hosted
UDP servers (getsockname() doesn't work for UDP).
--
Glynn Clements <[EMAIL PROTECTED]>
-
To unsubscribe from this list: send the line "unsubscribe linux-net" in
the body of a message to [EMAIL PROTECTED]
