2.3.2/src/vdetaplib/test.c

   1 /* Copyright 2004 Renzo Davoli
   2  * Reseased under the GPLv2 */
   3
   4 #include <stdio.h>
   5 #include <fcntl.h>
   6 #include <errno.h>
   7 #include <string.h>
   8 #include <unistd.h>
   9 #include <sys/ioctl.h>
  10 #include <net/if.h>
  11 #include <linux/if_tun.h>
  12
  13 #include <config.h>
  14 #include <vde.h>
  15 #include <vdecommon.h>
  16
  17 static int tun_alloc(char *dev)
  18 {
  19         struct ifreq ifr;
  20         int fd, err;
  21
  22         if( (fd = open("/dev/net/tun", O_RDWR)) < 0 )
  23                 return (-1);
  24
  25         memset(&ifr, 0, sizeof(ifr));
  26
  27         /* Flags: IFF_TUN   - TUN device (no Ethernet headers)
  28          *        IFF_TAP   - TAP device
  29          *
  30          *        IFF_NO_PI - Do not provide packet information
  31          */
  32         ifr.ifr_flags = IFF_TAP;
  33         if( *dev )
  34                 strncpy(ifr.ifr_name, dev, IFNAMSIZ);
  35
  36         if( (err = ioctl(fd, TUNSETIFF, (void *) &ifr)) < 0 ){
  37                 close(fd);
  38                 return err;
  39         }
  40         printf("ioctl returns\n");
  41         strcpy(dev, ifr.ifr_name);
  42         printf("ioctl idev\n");
  43         return fd;
  44 }
  45
  46 char interface[IFNAMSIZ]="tap0";
  47
  48 main()
  49 {
  50         tun_alloc(interface);
  51         pause();
  52 }