On Wed, Mar 04, 2009 at 04:59:02PM +0000, Nick Martin wrote:
> ifr.ifr_flags = IFF_TUN | IFF_NO_PI; /* Create a TUN device */
>
> if ( *dev )
> strncpy(ifr.ifr_name, dev, IFNAMSIZ);
>
> if ( (err = ioctl(fd, TUNSETIFF, (void*) &ifr)) < 0 )
> return err;
>
> /* Set no check sum - from the example */
> ioctl(fd, TUNSETNOCSUM, 1);
IMHO you should pass a reference to int as 3d arg, not literal "1":
int one = 1;
ioctl(fd, TUNSETNOCSUM, &one);
> /* Get the flags that are set */
> err = ioctl(fd, SIOCGIFFLAGS, (void*) &ifr);
> if ( err < 0 )
> return err;
>
> /* Set the flags that bring the device up */
> ifr.ifr_flags |= ( IFF_UP | IFF_RUNNING );
> err = ioctl(fd, SIOCSIFFLAGS, (void*) &ifr);
> if ( err < 0 )
> return err;
>
> As far as I can tell this is what ifconfig does, but it doesn't work.
Linux? It works for me:
s0 = socket(PF_INET,SOCK_DGRAM,0);
if (s0<0)
perror ("socket");
ret = ioctl(s0, SIOCSIFFLAGS, &ifr);
if (ret < 0)
perror("set flags");
I think that if SIOCGIFFLAGS succeeds on some fd, then SIOCSIFFLAGS
should also succeed or return an error. So this is a kernel bug.
Can you check it on different OSes?
--
Eugene Berdnikov
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