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/*
* GRUB -- GRand Unified Bootloader
* Copyright (C) 2010,2011,2012,2013 Free Software Foundation, Inc.
*
* GRUB is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* GRUB is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with GRUB. If not, see <http://www.gnu.org/licenses/>.
*/
#include <config.h>
#include <config-util.h>
#include <sys/socket.h>
#include <sys/types.h>
#include <linux/if.h>
#include <linux/if_tun.h>
#include <unistd.h>
#include <sys/ioctl.h>
#include <fcntl.h>
#include <string.h>
#include <grub/emu/net.h>
static int fd;
grub_ssize_t
grub_emunet_send (const void *packet, grub_size_t sz)
{
return write (fd, packet, sz);
}
grub_ssize_t
grub_emunet_receive (void *packet, grub_size_t sz)
{
return read (fd, packet, sz);
}
int
grub_emunet_create (grub_size_t *mtu)
{
struct ifreq ifr;
*mtu = 1500;
fd = open ("/dev/net/tun", O_RDWR | O_NONBLOCK);
if (fd < 0)
return -1;
memset (&ifr, 0, sizeof (ifr));
ifr.ifr_flags = IFF_TAP | IFF_NO_PI;
if (ioctl (fd, TUNSETIFF, &ifr) < 0)
{
close (fd);
fd = -1;
return -1;
}
return 0;
}
void
grub_emunet_close (void)
{
if (fd < 0)
return;
close (fd);
fd = -1;
}
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