#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))
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);
+ 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);
/* UNIX version of getting and setting the data in reparse points */
#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.
* Specifically, this translates the target from UTF-16 to the current multibyte
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,
git://wimlib.net / wimlib / blobdiff