vde-2/vdetaplib/test.c

   1 /* Copyright 2004 Renzo Davoli
   2  * Reseased under the GPLv2 */
   3
   4 #include <config.h>
   5 #include <stdio.h>
   6 #include <fcntl.h>
   7 #include <errno.h>
   8 #include <string.h>
   9 #include <unistd.h>
  10 #include <sys/ioctl.h>
  11 #include <net/if.h>
  12 #include <linux/if_tun.h>
  13
  14 static int tun_alloc(char *dev)
  15 {
  16         struct ifreq ifr;
  17         int fd, err;
  18
  19         if( (fd = open("/dev/net/tun", O_RDWR)) < 0 )
  20                 return (-1);
  21
  22         memset(&ifr, 0, sizeof(ifr));
  23
  24         /* Flags: IFF_TUN   - TUN device (no Ethernet headers)
  25          *        IFF_TAP   - TAP device
  26          *
  27          *        IFF_NO_PI - Do not provide packet information
  28          */
  29         ifr.ifr_flags = IFF_TAP;
  30         if( *dev )
  31                 strncpy(ifr.ifr_name, dev, IFNAMSIZ);
  32
  33         if( (err = ioctl(fd, TUNSETIFF, (void *) &ifr)) < 0 ){
  34                 close(fd);
  35                 return err;
  36         }
  37         printf("ioctl returns\n");
  38         strcpy(dev, ifr.ifr_name);
  39         printf("ioctl idev\n");
  40         return fd;
  41 }
  42
  43 char interface[IFNAMSIZ]="tap0";
  44
  45 main()
  46 {
  47         tun_alloc(interface);
  48         pause();
  49 }