Michael VanLoon <[EMAIL PROTECTED]> writes:
> Thanks that's just exactly the information I was looking for. :-)
>
> I'm slow grunging through the code and man pages that take this apart.
>
> As far as UNPv1 I assume you're referring to Stevens' "Unix Network
> Programming"? If I'm not mistaken he doesn't go much below the
> socket level. A quick glance through didn't reveal anything of this
> nature.
See UNIX Network Programming 2ed, Vol.1, pp434-435 for SIOCGIFCONF
explanation. But nowadays getifaddrs(3) is easier:
/* hacked from netbsd ifconfig.c */
#include <sys/types.h>
#include <sys/socket.h>
#include <ifaddrs.h>
#include <stdio.h>
#include <net/if_dl.h>
int main (void) {
struct ifaddrs *ifap, *ifaphead;
int rtnerr;
const struct sockaddr_dl *sdl;
caddr_t ap;
int alen;
rtnerr = getifaddrs(&ifaphead);
if (rtnerr) {
perror(NULL);
return 1;
}
for (ifap = ifaphead; ifap; ifap = ifap->ifa_next) {
if (ifap->ifa_addr->sa_family == AF_LINK) {
sdl = (const struct sockaddr_dl *) ifap->ifa_addr;
ap = ((caddr_t)((sdl)->sdl_data + (sdl)->sdl_nlen));
alen = sdl->sdl_alen;
if (ap && alen > 0) {
int i;
printf ("%s:", ifap->ifa_name);
for (i = 0; i < alen; i++, ap++)
printf("%c%02x", i > 0 ? ':' : ' ', 0xff&*ap);
putchar('\n');
}
}
}
putchar('\n');
freeifaddrs(ifaphead);
return 0;
}
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