Re: How do I find my own IP address?

Joe Armstrong wrote:
> I need to know my own IP address
>
> I can find my hostname
>
> 1> inet:gethostname().
> {ok,"enfield"}
>
> And do this
>
> 2> inet:gethostbyname("enfield").
>  
> {ok,{hostent,"localhost.localdomain",
>              ["localhost","enfield"],
>              inet,
>              4,
>              [{127,0,0,1}]}}
>
> But 127.0.0.1 is not my IP address

if you are interested i have written a c program to do some of the 
things above (this is what i suppose the inet module is/does).
if you run it, what kind of information does it print?


bengt

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






main(int argc, const char* argv[])
{
        char name[80];
        struct hostent *hp;
        char **p;

        if (0 != gethostname(name, sizeof (name))) {
                (void) printf("gethostname failed\n");
                exit (1);
        }

        hp = gethostbyname(name);
        if (hp == NULL) {
                (void) printf("host information for %s not found\n", name);
                exit (3);
        }

        for (p = hp->h_addr_list; *p != 0; p++) {
                struct in_addr in;
                char **q;

                (void) memcpy(&in.s_addr,   *p, sizeof (in.s_addr));
                (void)printf("%s\t%s", inet_ntoa(in), hp->h_name);

                for (q = hp->h_aliases; *q != 0; q++) {
                        (void) printf(" %s", *q);
                }

                (void) putchar('\n');
        }

        exit (0);
}