/*
* Copyright (C) 2012, 2013 Eric Biggers
*
- * This file is part of wimlib, a library for working with WIM files.
+ * This file is free software; you can redistribute it and/or modify it under
+ * the terms of the GNU Lesser General Public License as published by the Free
+ * Software Foundation; either version 3 of the License, or (at your option) any
+ * later version.
*
- * wimlib 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.
- *
- * wimlib 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
+ * This file 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 Lesser General Public License for more
* details.
*
- * You should have received a copy of the GNU General Public License
- * along with wimlib; if not, see http://www.gnu.org/licenses/.
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with this file; if not, see http://www.gnu.org/licenses/.
*/
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
+#include <errno.h>
+
+#include "wimlib/alloca.h"
#include "wimlib/assert.h"
+#include "wimlib/blob_table.h"
#include "wimlib/compiler.h"
#include "wimlib/endianness.h"
-#include "wimlib/dentry.h"
#include "wimlib/encoding.h"
#include "wimlib/error.h"
-#include "wimlib/lookup_table.h"
+#include "wimlib/inode.h"
#include "wimlib/reparse.h"
#include "wimlib/resource.h"
-#ifdef __WIN32__
-# include "wimlib/win32.h" /* for win32_get_file_and_vol_ids() */
-#endif
-
-#ifdef HAVE_ALLOCA_H
-# include <alloca.h>
-#endif
-#include <errno.h>
-#include <stdlib.h>
-
-/* On-disk format of a symbolic link (WIM_IO_REPARSE_TAG_SYMLINK) or junction
- * point (WIM_IO_REPARSE_TAG_MOUNT_POINT) reparse data buffer. */
-struct reparse_buffer_disk {
- le32 rptag;
- le16 rpdatalen;
- le16 rpreserved;
- le16 substitute_name_offset;
- le16 substitute_name_nbytes;
- le16 print_name_offset;
- le16 print_name_nbytes;
- union {
- struct {
- le32 rpflags;
- u8 data[REPARSE_POINT_MAX_SIZE - 20];
- } _packed_attribute symlink;
- struct {
- u8 data[REPARSE_POINT_MAX_SIZE - 16];
- } _packed_attribute junction;
- };
-} _packed_attribute;
-
-static const utf16lechar volume_junction_prefix[11] = {
- cpu_to_le16('\\'),
- cpu_to_le16('?'),
- cpu_to_le16('?'),
- cpu_to_le16('\\'),
- cpu_to_le16('V'),
- cpu_to_le16('o'),
- cpu_to_le16('l'),
- cpu_to_le16('u'),
- cpu_to_le16('m'),
- cpu_to_le16('e'),
- cpu_to_le16('{'),
-};
-
-/* Parse the "substitute name" (link target) from a symbolic link or junction
- * reparse point.
- *
- * Return value is:
- *
- * Non-negative integer:
- * The name is an absolute symbolic link in one of several formats,
- * and the return value is the number of UTF-16LE characters that need to
- * be advanced to reach a simple "absolute" path starting with a backslash
- * (i.e. skip over \??\ and/or drive letter)
- * Negative integer:
- * SUBST_NAME_IS_VOLUME_JUNCTION:
- * The name is a volume junction.
- * SUBST_NAME_IS_RELATIVE_LINK:
- * The name is a relative symbolic link.
- * SUBST_NAME_IS_UNKNOWN:
- * The name does not appear to be a valid symbolic link, junction,
- * or mount point.
- */
-int
-parse_substitute_name(const utf16lechar *substitute_name,
- u16 substitute_name_nbytes, u32 rptag)
-{
- u16 substitute_name_nchars = substitute_name_nbytes / 2;
-
- if (substitute_name_nchars >= 7 &&
- substitute_name[0] == cpu_to_le16('\\') &&
- substitute_name[1] == cpu_to_le16('?') &&
- substitute_name[2] == cpu_to_le16('?') &&
- substitute_name[3] == cpu_to_le16('\\') &&
- substitute_name[4] != cpu_to_le16('\0') &&
- substitute_name[5] == cpu_to_le16(':') &&
- substitute_name[6] == cpu_to_le16('\\'))
- {
- /* "Full" symlink or junction (\??\x:\ prefixed path) */
- return 6;
- } else if (rptag == WIM_IO_REPARSE_TAG_MOUNT_POINT &&
- substitute_name_nchars >= 12 &&
- memcmp(substitute_name, volume_junction_prefix,
- sizeof(volume_junction_prefix)) == 0 &&
- substitute_name[substitute_name_nchars - 1] == cpu_to_le16('\\'))
- {
- /* Volume junction. Can't really do anything with it. */
- return SUBST_NAME_IS_VOLUME_JUNCTION;
- } else if (rptag == WIM_IO_REPARSE_TAG_SYMLINK &&
- substitute_name_nchars >= 3 &&
- substitute_name[0] != cpu_to_le16('\0') &&
- substitute_name[1] == cpu_to_le16(':') &&
- substitute_name[2] == cpu_to_le16('\\'))
- {
- /* "Absolute" symlink, with drive letter */
- return 2;
- } else if (rptag == WIM_IO_REPARSE_TAG_SYMLINK &&
- substitute_name_nchars >= 1)
- {
- if (substitute_name[0] == cpu_to_le16('\\'))
- /* "Absolute" symlink, without drive letter */
- return 0;
- else
- /* "Relative" symlink, without drive letter */
- return SUBST_NAME_IS_RELATIVE_LINK;
- } else {
- return SUBST_NAME_IS_UNKNOWN;
- }
-}
-
/*
* Read the data from a symbolic link, junction, or mount point reparse point
* buffer into a `struct reparse_data'.
rpdata->rptag == WIM_IO_REPARSE_TAG_MOUNT_POINT);
rpdata->rpdatalen = le16_to_cpu(rpbuf_disk->rpdatalen);
rpdata->rpreserved = le16_to_cpu(rpbuf_disk->rpreserved);
- substitute_name_offset = le16_to_cpu(rpbuf_disk->substitute_name_offset);
- rpdata->substitute_name_nbytes = le16_to_cpu(rpbuf_disk->substitute_name_nbytes);
- print_name_offset = le16_to_cpu(rpbuf_disk->print_name_offset);
- rpdata->print_name_nbytes = le16_to_cpu(rpbuf_disk->print_name_nbytes);
+ substitute_name_offset = le16_to_cpu(rpbuf_disk->symlink.substitute_name_offset);
+ rpdata->substitute_name_nbytes = le16_to_cpu(rpbuf_disk->symlink.substitute_name_nbytes);
+ print_name_offset = le16_to_cpu(rpbuf_disk->symlink.print_name_offset);
+ rpdata->print_name_nbytes = le16_to_cpu(rpbuf_disk->symlink.print_name_nbytes);
if ((substitute_name_offset & 1) | (print_name_offset & 1) |
(rpdata->substitute_name_nbytes & 1) | (rpdata->print_name_nbytes & 1))
(struct reparse_buffer_disk*)rpbuf;
u8 *data;
- rpbuf_disk->rptag = cpu_to_le32(rpdata->rptag);
- rpbuf_disk->rpreserved = cpu_to_le16(rpdata->rpreserved);
- rpbuf_disk->substitute_name_offset = cpu_to_le16(0);
- rpbuf_disk->substitute_name_nbytes = cpu_to_le16(rpdata->substitute_name_nbytes);
- rpbuf_disk->print_name_offset = cpu_to_le16(rpdata->substitute_name_nbytes + 2);
- rpbuf_disk->print_name_nbytes = cpu_to_le16(rpdata->print_name_nbytes);
-
- if (rpdata->rptag == WIM_IO_REPARSE_TAG_SYMLINK) {
- rpbuf_disk->symlink.rpflags = cpu_to_le32(rpdata->rpflags);
+ if (rpdata->rptag == WIM_IO_REPARSE_TAG_SYMLINK)
data = rpbuf_disk->symlink.data;
- } else {
+ else
data = rpbuf_disk->junction.data;
- }
- /* We null-terminate the substitute and print names, although this may
- * not be strictly necessary. Note that the byte counts should not
- * include the null terminators. */
- if (data + rpdata->substitute_name_nbytes +
+ if ((data - rpbuf) + rpdata->substitute_name_nbytes +
rpdata->print_name_nbytes +
- 2 * sizeof(utf16lechar) - rpbuf > REPARSE_POINT_MAX_SIZE)
+ 2 * sizeof(utf16lechar) > REPARSE_POINT_MAX_SIZE)
{
ERROR("Reparse data is too long!");
return WIMLIB_ERR_INVALID_REPARSE_DATA;
}
+
+ rpbuf_disk->rptag = cpu_to_le32(rpdata->rptag);
+ rpbuf_disk->rpreserved = cpu_to_le16(rpdata->rpreserved);
+ rpbuf_disk->symlink.substitute_name_offset = cpu_to_le16(0);
+ rpbuf_disk->symlink.substitute_name_nbytes = cpu_to_le16(rpdata->substitute_name_nbytes);
+ rpbuf_disk->symlink.print_name_offset = cpu_to_le16(rpdata->substitute_name_nbytes + 2);
+ rpbuf_disk->symlink.print_name_nbytes = cpu_to_le16(rpdata->print_name_nbytes);
+
+ if (rpdata->rptag == WIM_IO_REPARSE_TAG_SYMLINK)
+ rpbuf_disk->symlink.rpflags = cpu_to_le32(rpdata->rpflags);
+
+ /* We null-terminate the substitute and print names, although this may
+ * not be strictly necessary. Note that the byte counts should not
+ * include the null terminators. */
data = mempcpy(data, rpdata->substitute_name, rpdata->substitute_name_nbytes);
*(utf16lechar*)data = cpu_to_le16(0);
data += 2;
data = mempcpy(data, rpdata->print_name, rpdata->print_name_nbytes);
*(utf16lechar*)data = cpu_to_le16(0);
data += 2;
- rpbuf_disk->rpdatalen = cpu_to_le16(data - rpbuf - 8);
+ rpbuf_disk->rpdatalen = cpu_to_le16(data - rpbuf - REPARSE_DATA_OFFSET);
*rpbuflen_ret = data - rpbuf;
return 0;
}
*
* Note: in the WIM format, the first 8 bytes of the reparse point data buffer
* are omitted, presumably because we already know the reparse tag from the
- * dentry, and we already know the reparse tag length from the lookup table
- * entry resource length. However, we reconstruct the first 8 bytes in the
- * buffer returned by this function.
+ * dentry, and we already know the reparse tag length from the blob length.
+ * However, we reconstruct the first 8 bytes in the buffer returned by this
+ * function.
*/
-int
+static int
wim_inode_get_reparse_data(const struct wim_inode * restrict inode,
u8 * restrict rpbuf,
u16 * restrict rpbuflen_ret,
- struct wim_lookup_table_entry *lte_override)
+ struct blob_descriptor *blob_override)
{
- struct wim_lookup_table_entry *lte;
+ struct blob_descriptor *blob;
int ret;
struct reparse_buffer_disk *rpbuf_disk;
u16 rpdatalen;
wimlib_assert(inode->i_attributes & FILE_ATTRIBUTE_REPARSE_POINT);
- if (!lte_override) {
- lte = inode_unnamed_lte_resolved(inode);
- if (!lte) {
+ if (blob_override) {
+ blob = blob_override;
+ } else {
+ struct wim_inode_stream *strm;
+
+ strm = inode_get_unnamed_stream(inode, STREAM_TYPE_REPARSE_POINT);
+ if (strm)
+ blob = stream_blob_resolved(strm);
+ else
+ blob = NULL;
+ if (!blob) {
ERROR("Reparse point has no reparse data!");
return WIMLIB_ERR_INVALID_REPARSE_DATA;
}
- } else {
- lte = lte_override;
}
- if (lte->size > REPARSE_POINT_MAX_SIZE - 8) {
+ if (blob->size > REPARSE_DATA_MAX_SIZE) {
ERROR("Reparse data is too long!");
return WIMLIB_ERR_INVALID_REPARSE_DATA;
}
- rpdatalen = lte->size;
+ rpdatalen = blob->size;
- /* Read the data from the WIM file */
- ret = read_full_stream_into_buf(lte, rpbuf + 8);
+ /* Read the reparse data from blob */
+ ret = read_full_blob_into_buf(blob, rpbuf + REPARSE_DATA_OFFSET);
if (ret)
return ret;
* XXX this could be one of the unknown fields in the WIM dentry. */
rpbuf_disk->rpreserved = cpu_to_le16(0);
- *rpbuflen_ret = rpdatalen + 8;
+ *rpbuflen_ret = rpdatalen + REPARSE_DATA_OFFSET;
return 0;
}
/* UNIX version of getting and setting the data in reparse points */
-#if !defined(__WIN32__)
+#ifndef __WIN32__
+
+static const utf16lechar volume_junction_prefix[11] = {
+ cpu_to_le16('\\'),
+ cpu_to_le16('?'),
+ cpu_to_le16('?'),
+ cpu_to_le16('\\'),
+ cpu_to_le16('V'),
+ cpu_to_le16('o'),
+ cpu_to_le16('l'),
+ cpu_to_le16('u'),
+ cpu_to_le16('m'),
+ cpu_to_le16('e'),
+ cpu_to_le16('{'),
+};
+
+enum {
+ SUBST_NAME_IS_RELATIVE_LINK = -1,
+ SUBST_NAME_IS_VOLUME_JUNCTION = -2,
+ SUBST_NAME_IS_UNKNOWN = -3,
+};
+
+/* Parse the "substitute name" (link target) from a symbolic link or junction
+ * reparse point.
+ *
+ * Return value is:
+ *
+ * Non-negative integer:
+ * The name is an absolute symbolic link in one of several formats,
+ * and the return value is the number of UTF-16LE characters that need to
+ * be advanced to reach a simple "absolute" path starting with a backslash
+ * (i.e. skip over \??\ and/or drive letter)
+ * Negative integer:
+ * SUBST_NAME_IS_VOLUME_JUNCTION:
+ * The name is a volume junction.
+ * SUBST_NAME_IS_RELATIVE_LINK:
+ * The name is a relative symbolic link.
+ * SUBST_NAME_IS_UNKNOWN:
+ * The name does not appear to be a valid symbolic link, junction,
+ * or mount point.
+ */
+static int
+parse_substitute_name(const utf16lechar *substitute_name,
+ u16 substitute_name_nbytes, u32 rptag)
+{
+ u16 substitute_name_nchars = substitute_name_nbytes / 2;
+
+ if (substitute_name_nchars >= 7 &&
+ substitute_name[0] == cpu_to_le16('\\') &&
+ substitute_name[1] == cpu_to_le16('?') &&
+ substitute_name[2] == cpu_to_le16('?') &&
+ substitute_name[3] == cpu_to_le16('\\') &&
+ substitute_name[4] != cpu_to_le16('\0') &&
+ substitute_name[5] == cpu_to_le16(':') &&
+ substitute_name[6] == cpu_to_le16('\\'))
+ {
+ /* "Full" symlink or junction (\??\x:\ prefixed path) */
+ return 6;
+ } else if (rptag == WIM_IO_REPARSE_TAG_MOUNT_POINT &&
+ substitute_name_nchars >= 12 &&
+ memcmp(substitute_name, volume_junction_prefix,
+ sizeof(volume_junction_prefix)) == 0 &&
+ substitute_name[substitute_name_nchars - 1] == cpu_to_le16('\\'))
+ {
+ /* Volume junction. Can't really do anything with it. */
+ return SUBST_NAME_IS_VOLUME_JUNCTION;
+ } else if (rptag == WIM_IO_REPARSE_TAG_SYMLINK &&
+ substitute_name_nchars >= 3 &&
+ substitute_name[0] != cpu_to_le16('\0') &&
+ substitute_name[1] == cpu_to_le16(':') &&
+ substitute_name[2] == cpu_to_le16('\\'))
+ {
+ /* "Absolute" symlink, with drive letter */
+ return 2;
+ } else if (rptag == WIM_IO_REPARSE_TAG_SYMLINK &&
+ substitute_name_nchars >= 1)
+ {
+ if (substitute_name[0] == cpu_to_le16('\\'))
+ /* "Absolute" symlink, without drive letter */
+ return 0;
+ else
+ /* "Relative" symlink, without drive letter */
+ return SUBST_NAME_IS_RELATIVE_LINK;
+ } else {
+ return SUBST_NAME_IS_UNKNOWN;
+ }
+}
/*
* Get the UNIX-style symlink target from the WIM inode for a reparse point.
* @bufsize
* Available space in @buf, in bytes.
*
- * @lte_override
- * If not NULL, the stream from which to read the reparse data. Otherwise,
- * the reparse data will be read from the unnamed stream of @inode.
+ * @blob_override
+ * If not NULL, the blob from which to read the reparse data. Otherwise,
+ * the reparse data will be read from the reparse point stream of @inode.
*
* If the entire symbolic link target was placed in the buffer, returns the
* number of bytes written. The resulting string is not null-terminated. If
ssize_t
wim_inode_readlink(const struct wim_inode * restrict inode,
char * restrict buf, size_t bufsize,
- struct wim_lookup_table_entry *lte_override)
+ struct blob_descriptor *blob_override)
{
int ret;
struct reparse_buffer_disk rpbuf_disk _aligned_attribute(8);
wimlib_assert(inode_is_symlink(inode));
if (wim_inode_get_reparse_data(inode, (u8*)&rpbuf_disk, &rpbuflen,
- lte_override))
+ blob_override))
return -EIO;
if (parse_reparse_data((const u8*)&rpbuf_disk, rpbuflen, &rpdata))
- return -EIO;
+ return -EINVAL;
ret = utf16le_to_tstr(rpdata.substitute_name,
rpdata.substitute_name_nbytes,
return ret;
}
+/* Given a UNIX-style symbolic link target, create a Windows-style reparse point
+ * buffer and assign it to the specified inode. */
int
-wim_inode_set_symlink(struct wim_inode *inode,
- const char *target,
- struct wim_lookup_table *lookup_table)
+wim_inode_set_symlink(struct wim_inode *inode, const char *target,
+ struct blob_table *blob_table)
{
struct reparse_buffer_disk rpbuf_disk _aligned_attribute(8);
ret = tstr_to_utf16le(target, strlen(target),
&name_utf16le, &name_utf16le_nbytes);
if (ret)
- return ret;
+ goto out;
for (size_t i = 0; i < name_utf16le_nbytes / 2; i++)
if (name_utf16le[i] == cpu_to_le16('/'))
}
ret = make_reparse_buffer(&rpdata, (u8*)&rpbuf_disk, &rpbuflen);
- if (ret == 0) {
- ret = inode_set_unnamed_stream(inode,
- (u8*)&rpbuf_disk + 8,
- rpbuflen - 8,
- lookup_table);
- }
+ if (ret)
+ goto out_free_name;
+
+ ret = WIMLIB_ERR_NOMEM;
+ if (!inode_add_stream_with_data(inode,
+ STREAM_TYPE_REPARSE_POINT,
+ NO_STREAM_NAME,
+ (u8*)&rpbuf_disk + REPARSE_DATA_OFFSET,
+ rpbuflen - REPARSE_DATA_OFFSET,
+ blob_table))
+ goto out_free_name;
+
+ ret = 0;
+out_free_name:
FREE(name_utf16le);
+out:
return ret;
}
-#include <sys/stat.h>
-
-static int
-unix_get_ino_and_dev(const char *path, u64 *ino_ret, u64 *dev_ret)
-{
- struct stat stbuf;
- if (stat(path, &stbuf)) {
- if (errno != ENOENT)
- WARNING_WITH_ERRNO("Failed to stat \"%s\"", path);
- /* Treat as a link pointing outside the capture root (it
- * most likely is). */
- return WIMLIB_ERR_STAT;
- } else {
- *ino_ret = stbuf.st_ino;
- *dev_ret = stbuf.st_dev;
- return 0;
- }
-}
-
-#endif /* !defined(__WIN32__) */
-
-/* is_rp_path_separator() - characters treated as path separators in absolute
- * symbolic link targets */
-
-#ifdef __WIN32__
-# define is_rp_path_separator(c) ((c) == L'\\' || (c) == L'/')
-# define os_get_ino_and_dev win32_get_file_and_vol_ids
-#else
-# define is_rp_path_separator(c) ((c) == '/')
-# define os_get_ino_and_dev unix_get_ino_and_dev
-#endif
-
-/* Fix up absolute symbolic link targets--- mostly shared between UNIX and
- * Windows */
-tchar *
-capture_fixup_absolute_symlink(tchar *dest,
- u64 capture_root_ino, u64 capture_root_dev)
-{
- tchar *p = dest;
-
-#ifdef __WIN32__
- /* Skip drive letter */
- if (!is_rp_path_separator(*dest))
- p += 2;
-#endif
-
- DEBUG("Fixing symlink or junction \"%"TS"\"", dest);
- for (;;) {
- tchar save;
- int ret;
- u64 ino;
- u64 dev;
-
- while (is_rp_path_separator(*p))
- p++;
-
- save = *p;
- *p = T('\0');
- ret = os_get_ino_and_dev(dest, &ino, &dev);
- *p = save;
-
- if (ret) /* stat() failed before we got to the capture root---
- assume the link points outside it. */
- return NULL;
-
- if (ino == capture_root_ino && dev == capture_root_dev) {
- /* Link points inside capture root. Return abbreviated
- * path. */
- if (*p == T('\0'))
- *(p - 1) = OS_PREFERRED_PATH_SEPARATOR;
- while (p - 1 >= dest && is_rp_path_separator(*(p - 1)))
- p--;
- #ifdef __WIN32__
- if (!is_rp_path_separator(dest[0])) {
- *--p = dest[1];
- *--p = dest[0];
- }
- #endif
- wimlib_assert(p >= dest);
- return p;
- }
-
- if (*p == T('\0')) {
- /* Link points outside capture root. */
- return NULL;
- }
-
- do {
- p++;
- } while (!is_rp_path_separator(*p) && *p != T('\0'));
- }
-}
+#endif /* !__WIN32__ */
git://wimlib.net / wimlib / blobdiff