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#include <stdio.h>
#include <fcntl.h>
#include <errno.h>
#include <string.h>
#include <unistd.h>
#include <sys/ioctl.h>
#include <net/if.h>
#include <linux/if_tun.h>
#include "port.h"
static void send_tap(int fd, void *packet, int len, void *unused)
{
int n;
n = write(fd, packet, len);
if(n != len){
if(errno != EAGAIN) perror("send_tap");
}
}
int open_tap(char *dev)
{
struct ifreq ifr;
int fd, err;
if((fd = open("/dev/net/tun", O_RDWR)) < 0){
perror("Failed to open /dev/net/tun");
return(-1);
}
memset(&ifr, 0, sizeof(ifr));
ifr.ifr_flags = IFF_TAP | IFF_NO_PI;
strncpy(ifr.ifr_name, dev, sizeof(ifr.ifr_name) - 1);
if(ioctl(fd, TUNSETIFF, (void *) &ifr) < 0){
perror("TUNSETIFF failed");
close(fd);
return(-1);
}
err = setup_port(fd, send_tap, NULL, 0);
if(err) return(err);
return(fd);
}
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