/* * 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; }