Messages in this thread | | | Date | Sun, 10 Feb 2002 16:44:35 -0500 (EST) | From | Marek Zawadzki <> | Subject | TUN/TAP driver doesn't work. |
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Hello,
I am trying to use TUN/TAP driver. My OS is RH71, kernel is 2.4.17, with tuntap compiled as a module. Module is inserted properly when I try to open '/dev/net/tun', and I get kernel message saying "TUN/TAP universal driver, (c)...etc.". But ioctls don't work and always return '-1'. To test it I was using code from tuntap's documentation (included below this message and btw I don't understand dev's name str-copying in this code) and pengaol, newest version, which I know works with tuntap. None of these 2 programs work for me.
Any help would be really greatly appreciated.
-marek
-- test code -- #include <sys/fcntl.h> #include <sys/ioctl.h> #include <net/if.h> #include <linux/if_tun.h>
int tun_alloc(char *dev) { struct ifreq ifr; int fd, err;
if( (fd = open("/dev/net/tun", O_RDWR)) < 0 ) { printf("open error\n"); return 0; }
memset(&ifr, 0, sizeof(ifr));
/* Flags: IFF_TUN - TUN device (no Ethernet headers) * IFF_TAP - TAP device * IFF_NO_PI - Do not provide packet information * */ ifr.ifr_flags = IFF_TUN;
if( *dev ) strncpy(ifr.ifr_name, dev, IFNAMSIZ);
if( (err = ioctl(fd, TUNSETIFF, (void *) &ifr)) < 0 ){ printf("ioctl err %d: %s\n", err, strerror(err)); close(fd); return err; } strcpy(dev, ifr.ifr_name); return fd; }
int main(int argc, char **argv) { char test[100] = "1234567890123456"; tun_alloc(test); return 0; }
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