1 files changed, 74 insertions, 0 deletions
diff --git a/grub-core/osdep/linux/emunet.c b/grub-core/osdep/linux/emunet.c
new file mode 100644
index 0000000..19b188f
--- /dev/null
+++ b/grub-core/osdep/linux/emunet.c
@@ -0,0 +1,74 @@
+/*
+ *  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;
+}