Date: Wed, 19 Feb 1997 20:36:28 -0600 From: elh@astroarch.com To: freebsd-bugs@FreeBSD.ORG Cc: elh@secretariat.astroarch.com Subject: SIOCGIFPHYS Message-ID: <199702200236.UAA09387@secretariat.astroarch.com>
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I am in need of code that can query the physical hardware address of an ethernet. I have written the following code but it is to no avail.
The SIOCIFPHYS and ifi_physical return 0. I am running 2.1 of FreeBSD. The code follows:
#include <sys/param.h>
#include <sys/ioctl.h>
#include <sys/socket.h>
#include <sys/sysctl.h>
#include <sys/time.h>
#include <net/if.h>
#include <net/if_dl.h>
#include <net/if_types.h>
#include <net/route.h>
/* IP */
#include <netinet/in.h>
#include <netinet/in_var.h>
#include <arpa/inet.h>
#include <netdb.h>
main()
{
size_t needed;
int mib[6];
char *buf, *lim, *next;
struct if_msghdr *ifm;
struct sockaddr_dl *sdl;
int s,flags;
int af = AF_INET;
char name[32];
struct ifreq ifr;
mib[0] = CTL_NET;
mib[1] = PF_ROUTE;
mib[2] = 0;
mib[3] = 0; /* address family */
mib[4] = NET_RT_IFLIST;
mib[5] = 0;
/* if particular family specified, only ask about it */
sysctl(mib, 6, NULL, &needed, NULL, 0);
buf = (char *)malloc(needed);
sysctl(mib, 6, buf, &needed, NULL, 0);
lim=buf+needed;
for (next = buf; next < lim; next += ifm->ifm_msglen) {
ifm = (struct if_msghdr *)next;
/* XXX: Swallow up leftover NEWADDR messages */
if (ifm->ifm_type == RTM_NEWADDR)
continue;
if (ifm->ifm_type == RTM_IFINFO) {
sdl = (struct sockaddr_dl *)(ifm + 1);
flags = ifm->ifm_flags;
}
strncpy(name, sdl->sdl_data, sdl->sdl_nlen);
name[sdl->sdl_nlen] = '\0';
printf("%s %s\n",name,ifm->ifm_data.ifi_physical);
s = socket(af, SOCK_DGRAM, 0);
strncpy(ifr.ifr_name, name, sizeof ifr.ifr_name);
ioctl(s, SIOCGIFPHYS, (caddr_t)&ifr);
printf("%s %d\n",name,ifr.ifr_phys);
}
}
Suggestions are welcome. :)
Best regards,
Ed Haletky
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