74 lines
1.6 KiB
C
74 lines
1.6 KiB
C
/*
|
|
* 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;
|
|
}
|