/* Copyright 2002 Yon Uriarte and Jeff Dike
 * Licensed under the GPL
 * This file is part of the original uml_switch code
 * Modified 2003 Renzo Davoli
 */

#include <stdio.h>
#include <fcntl.h>
#include <errno.h>
#include <string.h>
#include <unistd.h>
#include <syslog.h>
#include <sys/ioctl.h>
#ifdef __FreeBSD__
#include <sys/types.h>
#include <sys/socket.h>
#endif
#include <net/if.h>
#ifdef __FreeBSD__
#include <net/if_tun.h>
#else
#include <linux/if_tun.h>
#endif
#include "port.h"
#include "switch.h"

void send_tap(int fd, void *packet, int len, void *unused)
{
  int n;

  n = write(fd, packet, len);
  if(n != len){
    if(errno != EAGAIN) printlog(LOG_WARNING,"send_tap %s",strerror(errno));
  }
}

int open_tap(char *dev)
{
#ifndef __FreeBSD__
  struct ifreq ifr;
#endif
  int fd;

  if((fd = open(dev, O_RDWR)) < 0){
    printlog(LOG_ERR,"Failed to open %s %s", dev, strerror(errno));
    return(-1);
  }
#ifndef __FreeBSD__
  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){
    printlog(LOG_ERR,"TUNSETIFF failed %s",strerror(errno));
    close(fd);
    return(-1);
  }
#endif
  return(fd);
}