inet_ntop( )

[Giorgos Keramidas]

On 2004-08-12 02:06, Nicolas B?rard Nault <nicobn at quebecbsd.org> wrote:
>
> I wondered, why does inet_ntop() returns addresses in the format
> x:x:x:x:x:x:x.x.x.x ? This can be very annoying if that's not what you
> want. Is there another standard function, other than inet_ntop(), to do
> the same work ?

Can you show us a minimal program that exhibits this behavior?  The
function seems to work as expected here.  The only case where the format
you describe is used is with AF_INET6 addresses, which is not a bug AFAIK.

For instance, the following program:

    #include <sys/types.h>
    #include <sys/socket.h>
    #include <netinet/in.h>
    #include <arpa/inet.h>

    #include <err.h>
    #include <stdio.h>
    #include <stdlib.h>

    #define BUFLEN  100

    int
    main(void)
    {
            struct in_addr ia;
            char buf[BUFLEN];

            ia.s_addr = htonl(0x7f000001);

            if (inet_ntop(AF_INET, &ia, buf, BUFLEN - 1) == NULL)
                    err(1, "inet_ntop");
            printf("inet: %s\n", buf);

            return EXIT_SUCCESS;
    }

Prints the following output (note that the inet6 address output is probably
an invalid address but still gets printed in the usual format):

	$ ./foo
	inet: 127.0.0.1
	$

Are you sure you're calling inet_ntop() as you should?

- Giorgos