/* socket-flags
   Copyright 2009 TJ <ubuntu@tjworld.net>
   Licensed on the terms of the GNU GPL version 3
 */

#include <stdio.h>
#include <string.h>
#include <net/if.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/ioctl.h>

/* from /usr/include/net/if.h */
const char *flag_names[] = {
 "NA",
 "IFF_UP",
 "IFF_BROADCAST",
 "IFF_DEBUG",
 "IFF_LOOPBACK",
 "IFF_POINTTOPOINT",
 "IFF_NOTRAILERS",
 "IFF_RUNNING",
 "IFF_NOARP",
 "IFF_PROMISC",
 "IFF_ALLMULTI",
 "IFF_MASTER",
 "IFF_SLAVE",
 "IFF_MULTICAST",
 "IFF_PORTSEL",
 "IFF_AUTOMEDIA",
 "IFF_DYNAMIC",
};

int main(int argc, char **argv, char **env)
{
 if (argv[1]) {
  int skfd = socket (AF_INET, SOCK_DGRAM, 0);
 
  if (skfd) {
   struct ifreq ifr;
  
   strncpy (ifr.ifr_name, argv[1], sizeof ifr.ifr_name);
   if (!ioctl (skfd, SIOCGIFFLAGS, &ifr)) {
 	int i;
    const short int flags = ifr.ifr_flags;
    printf("%s SIOCGIFFLAGS 0x%x (", argv[1], flags);
 	for (i=0; i < 15; i++) {
	 if (flags & (1 << i)) printf(" %s (0x%x)", flag_names[i+1], 1 << i);
	}
    printf(")\n");
   }
  }
  close (skfd);
 }
 else {
  printf("Usage: %s <interface>\n", argv[0]);
 }
}