#include <fcntl.h>
#include <limits.h> /* for PATH_MAX */
#include <sys/stat.h>
+#include <sys/types.h>
+#ifdef HAVE_SYS_XATTR_H
+# include <sys/xattr.h>
+#endif
#include <unistd.h>
#include "wimlib/blob_table.h"
#include "wimlib/scan.h"
#include "wimlib/timestamp.h"
#include "wimlib/unix_data.h"
+#include "wimlib/xattr.h"
#ifdef HAVE_FDOPENDIR
# define my_fdopendir(dirfd_p) fdopendir(*(dirfd_p))
# define AT_SYMLINK_NOFOLLOW 0x100
#endif
+#ifdef HAVE_XATTR_SUPPORT
+/*
+ * Retrieves the values of the xattrs named by the null-terminated @names of the
+ * file at @path and serializes the xattr names and values into @entries. If
+ * successful, returns the number of bytes used in @entries. If unsuccessful,
+ * returns -1 and sets errno (ERANGE if @entries was too small).
+ */
+static ssize_t
+gather_xattr_entries(const char *path, const char *names, size_t names_size,
+ void *entries, size_t entries_size)
+{
+ const char * const names_end = names + names_size;
+ void * const entries_end = entries + entries_size;
+ const char *name = names;
+ struct wimlib_xattr_entry *entry = entries;
+
+ wimlib_assert((uintptr_t)entries % 4 == 0 &&
+ entries_size % 4 == 0 && names_size != 0);
+ do {
+ size_t name_len = strnlen(name, names_end - name);
+ void *value;
+ ssize_t value_len;
+
+ if (name_len == 0 || name_len >= names_end - name ||
+ (u16)name_len != name_len)
+ goto malformed;
+
+ /*
+ * Note: we take care to always call lgetxattr() with a nonzero
+ * size, since zero size means to return the value length only.
+ */
+ if (entries_end - (void *)entry <= sizeof(*entry) + name_len) {
+ errno = ERANGE;
+ return -1;
+ }
+
+ entry->name_len = cpu_to_le16(name_len);
+ entry->reserved = cpu_to_le16(0);
+ value = mempcpy(entry->name, name, name_len);
+
+ value_len = lgetxattr(path, name, value, entries_end - value);
+ if (value_len < 0) {
+ if (errno != ERANGE) {
+ ERROR_WITH_ERRNO("\"%s\": unable to read "
+ "extended attribute \"%s\"",
+ path, name);
+ }
+ return -1;
+ }
+ if ((u32)value_len != value_len)
+ goto malformed;
+ entry->value_len = cpu_to_le32(value_len);
+ value += value_len;
+
+ /* pad value to next 4-byte boundary */
+ memset(value, 0, -(uintptr_t)value & 3);
+ value += -(uintptr_t)value & 3;
+
+ entry = value;
+ name += name_len + 1;
+ } while (name < names_end);
+
+ return (void *)entry - entries;
+
+malformed:
+ errno = EINVAL;
+ ERROR("\"%s\": malformed extended attribute name list", path);
+ return -1;
+}
+
+static int
+create_xattr_stream(const char *path, struct wim_inode *inode,
+ struct blob_table *blob_table,
+ const char *names, size_t names_size)
+{
+ char _entries[1024] _aligned_attribute(4);
+ char *entries = _entries;
+ size_t entries_avail = ARRAY_LEN(_entries);
+ ssize_t entries_size;
+ struct wim_inode_stream *strm;
+ int ret;
+
+retry:
+ /* Serialize the xattrs into @entries */
+ entries_size = gather_xattr_entries(path, names, names_size,
+ entries, entries_avail);
+ if (entries_size < 0) {
+ ret = WIMLIB_ERR_STAT;
+ if (errno != ERANGE)
+ goto out;
+ /* Not enough space in @entries. Reallocate it. */
+ if (entries != _entries)
+ FREE(entries);
+ ret = WIMLIB_ERR_NOMEM;
+ entries_avail *= 2;
+ entries = MALLOC(entries_avail);
+ if (!entries)
+ goto out;
+ goto retry;
+ }
+
+ /* Add the xattr stream from the serialized xattrs in @entries */
+ ret = WIMLIB_ERR_NOMEM;
+ strm = inode_add_stream_with_data(inode, STREAM_TYPE_LINUX_XATTR,
+ NO_STREAM_NAME, entries, entries_size,
+ blob_table);
+ if (!strm)
+ goto out;
+
+ if (!inode_set_linux_xattr_hash(inode, stream_hash(strm))) {
+ inode_remove_stream(inode, strm, blob_table);
+ goto out;
+ }
+
+ ret = 0;
+out:
+ if (entries != _entries)
+ FREE(entries);
+ return ret;
+}
+
+/*
+ * If the file at @path has Linux-style extended attributes, read them into
+ * memory and add them to @inode as a stream (deduplicated in @blob_table).
+ */
+static noinline_for_stack int
+scan_linux_xattrs(const char *path, struct wim_inode *inode,
+ struct blob_table *blob_table)
+{
+ char _names[1024];
+ char *names = _names;
+ ssize_t names_size = ARRAY_LEN(_names);
+ int ret;
+
+retry:
+ /* Gather the names of the xattrs of the file at @path */
+ ret = 0;
+ names_size = llistxattr(path, names, names_size);
+ if (names_size == 0) /* No xattrs? */
+ goto out;
+ if (names_size < 0) {
+ ret = 0;
+ if (errno == ENOTSUP) /* No xattrs (unsupported or disabled)? */
+ goto out;
+ if (errno == ERANGE) {
+ /*
+ * Not enough space in @names. Ask for how much space
+ * we need, then try again.
+ */
+ names_size = llistxattr(path, NULL, 0);
+ if (names_size >= 0) {
+ if (names != _names)
+ FREE(names);
+ ret = WIMLIB_ERR_NOMEM;
+ names = MALLOC(names_size);
+ if (!names)
+ goto out;
+ goto retry;
+ }
+ }
+ WARNING_WITH_ERRNO("\"%s\": unable to list extended attributes",
+ path);
+ ret = WIMLIB_ERR_STAT;
+ goto out;
+ }
+
+ /*
+ * We have a nonempty list of xattr names. Gather the xattr values and
+ * add the xattr stream.
+ */
+ ret = create_xattr_stream(path, inode, blob_table, names, names_size);
+out:
+ if (names != _names)
+ FREE(names);
+ return ret;
+}
+#endif /* HAVE_XATTR_SUPPORT */
+
static int
unix_scan_regular_file(const char *path, u64 blocks, u64 size,
struct wim_inode *inode,
ret = WIMLIB_ERR_NOMEM;
goto out;
}
+#ifdef HAVE_XATTR_SUPPORT
+ ret = scan_linux_xattrs(full_path, inode, params->blob_table);
+ if (ret)
+ goto out;
+#endif
}
if (params->add_flags & WIMLIB_ADD_FLAG_ROOT) {
git://wimlib.net / wimlib / commitdiff