#include "iftun.h"

#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <sys/socket.h>
#include <sys/stat.h>
#include <sys/ioctl.h>

#include <sys/types.h>
#include <string.h>
#include <netdb.h>

#include <unistd.h>
#include <fcntl.h>
#include <linux/if.h>
#include <linux/if_tun.h>


int tun_alloc(const char *dev) {
	int fd = open("/dev/net/tun", O_RDWR);
	if(fd < 0) {
		perror("open");
		exit(1);
	}

	struct ifreq ifr = {
		.ifr_flags = IFF_TUN | IFF_NO_PI
	};

	if (*dev) {
		strncpy(ifr.ifr_name, dev, IFNAMSIZ);
	}

	int err = ioctl(fd, TUNSETIFF, (void *) &ifr);
	if(err < 0){
		exit(1);
	}

	return fd;
}


int copy(int src, int dest) {
	char buf[1024];
	int n = 0;

	while (1) {
		n = read(src, buf, 1024);
		write(dest, buf, n);
	}
}