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#include "platform.h"
#include <linux/if_tun.h>
/**
* Creates a tun-interface called dev;
* dev is asumed to point to a char[IFNAMSIZ]
* if *dev == 0, uses the name supplied by the kernel
* returns the fd to the tun or -1
*/
int init_tun(char *dev) {{{
if (!dev) {
errno = EINVAL;
return -1;
}
struct ifreq ifr;
int fd, err;
if( (fd = open("/dev/net/tun", O_RDWR)) < 0 ) {
fprintf(stderr, "opening /dev/net/tun: %s\n", strerror(errno));
return -1;
}
memset(&ifr, 0, sizeof(ifr));
ifr.ifr_flags = IFF_TUN;
if (*dev)
strncpy(ifr.ifr_name, dev, IFNAMSIZ);
if ((err = ioctl(fd, TUNSETIFF, (void *) &ifr)) < 0 ){
close(fd);
fprintf(stderr, "ioctl'ing /dev/net/tun: %s\n", strerror(errno));
return err;
}
strcpy(dev, ifr.ifr_name);
return fd;
}}}
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