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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 16:29:51 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 16:29:51 +0000
commit6e7a315eb67cb6c113cf37e1d66c4f11a51a2b3e (patch)
tree32451fa3cdd9321fb2591fada9891b2cb70a9cd1 /grub-core/kern/emu/hostfs.c
parentInitial commit. (diff)
downloadgrub2-6e7a315eb67cb6c113cf37e1d66c4f11a51a2b3e.tar.xz
grub2-6e7a315eb67cb6c113cf37e1d66c4f11a51a2b3e.zip
Adding upstream version 2.06.upstream/2.06upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'grub-core/kern/emu/hostfs.c')
-rw-r--r--grub-core/kern/emu/hostfs.c200
1 files changed, 200 insertions, 0 deletions
diff --git a/grub-core/kern/emu/hostfs.c b/grub-core/kern/emu/hostfs.c
new file mode 100644
index 0000000..cb53210
--- /dev/null
+++ b/grub-core/kern/emu/hostfs.c
@@ -0,0 +1,200 @@
+/* hostfs.c - Dummy filesystem to provide access to the hosts filesystem */
+/*
+ * GRUB -- GRand Unified Bootloader
+ * Copyright (C) 2007,2008,2009,2010 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-util.h>
+
+#include <grub/fs.h>
+#include <grub/file.h>
+#include <grub/disk.h>
+#include <grub/misc.h>
+#include <grub/mm.h>
+#include <grub/dl.h>
+#include <grub/util/misc.h>
+#include <grub/emu/hostdisk.h>
+#include <grub/i18n.h>
+
+#include <stdio.h>
+#include <errno.h>
+#include <string.h>
+
+static int
+is_dir (const char *path, const char *name)
+{
+ int len1 = strlen(path);
+ int len2 = strlen(name);
+ int ret;
+
+ char *pathname = xmalloc (len1 + 1 + len2 + 1 + 13);
+ strcpy (pathname, path);
+
+ /* Avoid UNC-path "//name" on Cygwin. */
+ if (len1 > 0 && pathname[len1 - 1] != '/')
+ strcat (pathname, "/");
+
+ strcat (pathname, name);
+
+ ret = grub_util_is_directory (pathname);
+ free (pathname);
+ return ret;
+}
+
+struct grub_hostfs_data
+{
+ char *filename;
+ grub_util_fd_t f;
+};
+
+static grub_err_t
+grub_hostfs_dir (grub_device_t device, const char *path,
+ grub_fs_dir_hook_t hook, void *hook_data)
+{
+ grub_util_fd_dir_t dir;
+
+ /* Check if the disk is our dummy disk. */
+ if (grub_strcmp (device->disk->name, "host"))
+ return grub_error (GRUB_ERR_BAD_FS, "not a hostfs");
+
+ dir = grub_util_fd_opendir (path);
+ if (! dir)
+ return grub_error (GRUB_ERR_BAD_FILENAME,
+ N_("can't open `%s': %s"), path,
+ grub_util_fd_strerror ());
+
+ while (1)
+ {
+ grub_util_fd_dirent_t de;
+ struct grub_dirhook_info info;
+ grub_memset (&info, 0, sizeof (info));
+
+ de = grub_util_fd_readdir (dir);
+ if (! de)
+ break;
+
+ info.dir = !! is_dir (path, de->d_name);
+ hook (de->d_name, &info, hook_data);
+
+ }
+
+ grub_util_fd_closedir (dir);
+
+ return GRUB_ERR_NONE;
+}
+
+/* Open a file named NAME and initialize FILE. */
+static grub_err_t
+grub_hostfs_open (struct grub_file *file, const char *name)
+{
+ grub_util_fd_t f;
+ struct grub_hostfs_data *data;
+
+ f = grub_util_fd_open (name, GRUB_UTIL_FD_O_RDONLY);
+ if (! GRUB_UTIL_FD_IS_VALID (f))
+ return grub_error (GRUB_ERR_BAD_FILENAME,
+ N_("can't open `%s': %s"), name,
+ strerror (errno));
+ data = grub_malloc (sizeof (*data));
+ if (!data)
+ {
+ grub_util_fd_close (f);
+ return grub_errno;
+ }
+ data->filename = grub_strdup (name);
+ if (!data->filename)
+ {
+ grub_free (data);
+ grub_util_fd_close (f);
+ return grub_errno;
+ }
+
+ data->f = f;
+
+ file->data = data;
+
+ file->size = grub_util_get_fd_size (f, name, NULL);
+
+ return GRUB_ERR_NONE;
+}
+
+static grub_ssize_t
+grub_hostfs_read (grub_file_t file, char *buf, grub_size_t len)
+{
+ struct grub_hostfs_data *data;
+
+ data = file->data;
+ if (grub_util_fd_seek (data->f, file->offset) != 0)
+ {
+ grub_error (GRUB_ERR_OUT_OF_RANGE, N_("cannot seek `%s': %s"),
+ data->filename, grub_util_fd_strerror ());
+ return -1;
+ }
+
+ unsigned int s = grub_util_fd_read (data->f, buf, len);
+ if (s != len)
+ grub_error (GRUB_ERR_FILE_READ_ERROR, N_("cannot read `%s': %s"),
+ data->filename, grub_util_fd_strerror ());
+
+ return (signed) s;
+}
+
+static grub_err_t
+grub_hostfs_close (grub_file_t file)
+{
+ struct grub_hostfs_data *data;
+
+ data = file->data;
+ grub_util_fd_close (data->f);
+ grub_free (data->filename);
+ grub_free (data);
+
+ return GRUB_ERR_NONE;
+}
+
+static grub_err_t
+grub_hostfs_label (grub_device_t device __attribute ((unused)),
+ char **label __attribute ((unused)))
+{
+ *label = 0;
+ return GRUB_ERR_NONE;
+}
+
+#undef open
+#undef close
+
+static struct grub_fs grub_hostfs_fs =
+ {
+ .name = "hostfs",
+ .fs_dir = grub_hostfs_dir,
+ .fs_open = grub_hostfs_open,
+ .fs_read = grub_hostfs_read,
+ .fs_close = grub_hostfs_close,
+ .fs_label = grub_hostfs_label,
+ .next = 0
+ };
+
+
+
+GRUB_MOD_INIT(hostfs)
+{
+ grub_fs_register (&grub_hostfs_fs);
+}
+
+GRUB_MOD_FINI(hostfs)
+{
+ grub_fs_unregister (&grub_hostfs_fs);
+}