Adding upstream version 1:4.8.1.upstream/1%4.8.1upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 839 insertions, 0 deletions

diff --git a/libmisc/copydir.c b/libmisc/copydir.c
new file mode 100644
index 0000000..e6aac6e
--- /dev/null
+++ b/libmisc/copydir.c
@@ -0,0 +1,839 @@
+/*
+ * Copyright (c) 1991 - 1994, Julianne Frances Haugh
+ * Copyright (c) 1996 - 2001, Marek Michałkiewicz
+ * Copyright (c) 2003 - 2006, Tomasz Kłoczko
+ * Copyright (c) 2007 - 2010, Nicolas François
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. The name of the copyright holders or contributors may not be used to
+ *    endorse or promote products derived from this software without
+ *    specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
+ * PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT
+ * HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <config.h>
+
+#ident "$Id$"
+
+#include <assert.h>
+#include <sys/stat.h>
+#include <sys/types.h>
+#include <sys/time.h>
+#include <fcntl.h>
+#include <stdio.h>
+#include "prototypes.h"
+#include "defines.h"
+#ifdef WITH_SELINUX
+#include <selinux/selinux.h>
+#endif				/* WITH_SELINUX */
+#if defined(WITH_ACL) || defined(WITH_ATTR)
+#include <stdarg.h>
+#include <attr/error_context.h>
+#endif				/* WITH_ACL || WITH_ATTR */
+#ifdef WITH_ACL
+#include <acl/libacl.h>
+#endif				/* WITH_ACL */
+#ifdef WITH_ATTR
+#include <attr/libattr.h>
+#endif				/* WITH_ATTR */
+
+
+static /*@null@*/const char *src_orig;
+static /*@null@*/const char *dst_orig;
+
+struct link_name {
+	dev_t ln_dev;
+	ino_t ln_ino;
+	nlink_t ln_count;
+	char *ln_name;
+	/*@dependent@*/struct link_name *ln_next;
+};
+static /*@exposed@*/struct link_name *links;
+
+static int copy_entry (const char *src, const char *dst,
+                       bool reset_selinux,
+                       uid_t old_uid, uid_t new_uid,
+                       gid_t old_gid, gid_t new_gid);
+static int copy_dir (const char *src, const char *dst,
+                     bool reset_selinux,
+                     const struct stat *statp, const struct timeval mt[],
+                     uid_t old_uid, uid_t new_uid,
+                     gid_t old_gid, gid_t new_gid);
+#ifdef	S_IFLNK
+static /*@null@*/char *readlink_malloc (const char *filename);
+static int copy_symlink (const char *src, const char *dst,
+                         unused bool reset_selinux,
+                         const struct stat *statp, const struct timeval mt[],
+                         uid_t old_uid, uid_t new_uid,
+                         gid_t old_gid, gid_t new_gid);
+#endif				/* S_IFLNK */
+static int copy_hardlink (const char *dst,
+                          unused bool reset_selinux,
+                          struct link_name *lp);
+static int copy_special (const char *src, const char *dst,
+                         bool reset_selinux,
+                         const struct stat *statp, const struct timeval mt[],
+                         uid_t old_uid, uid_t new_uid,
+                         gid_t old_gid, gid_t new_gid);
+static int copy_file (const char *src, const char *dst,
+                      bool reset_selinux,
+                      const struct stat *statp, const struct timeval mt[],
+                      uid_t old_uid, uid_t new_uid,
+                      gid_t old_gid, gid_t new_gid);
+static int chown_if_needed (const char *dst, const struct stat *statp,
+                            uid_t old_uid, uid_t new_uid,
+                            gid_t old_gid, gid_t new_gid);
+static int lchown_if_needed (const char *dst, const struct stat *statp,
+                             uid_t old_uid, uid_t new_uid,
+                             gid_t old_gid, gid_t new_gid);
+static int fchown_if_needed (int fdst, const struct stat *statp,
+                             uid_t old_uid, uid_t new_uid,
+                             gid_t old_gid, gid_t new_gid);
+
+#if defined(WITH_ACL) || defined(WITH_ATTR)
+/*
+ * error_acl - format the error messages for the ACL and EQ libraries.
+ */
+static void error_acl (struct error_context *ctx, const char *fmt, ...)
+{
+	va_list ap;
+
+	/* ignore the case when destination does not support ACLs 
+	 * or extended attributes */
+	if (ENOTSUP == errno) {
+		errno = 0;
+		return;
+	}
+
+	va_start (ap, fmt);
+	(void) fprintf (stderr, _("%s: "), Prog);
+	if (vfprintf (stderr, fmt, ap) != 0) {
+		(void) fputs (_(": "), stderr);
+	}
+	(void) fprintf (stderr, "%s\n", strerror (errno));
+	va_end (ap);
+}
+
+static struct error_context ctx = {
+	error_acl
+};
+#endif				/* WITH_ACL || WITH_ATTR */
+
+/*
+ * remove_link - delete a link from the linked list
+ */
+static void remove_link (/*@only@*/struct link_name *ln)
+{
+	struct link_name *lp;
+
+	if (links == ln) {
+		links = ln->ln_next;
+		free (ln->ln_name);
+		free (ln);
+		return;
+	}
+	for (lp = links; NULL !=lp; lp = lp->ln_next) {
+		if (lp->ln_next == ln) {
+			break;
+		}
+	}
+
+	if (NULL == lp) {
+		free (ln->ln_name);
+		free (ln);
+		return;
+	}
+
+	lp->ln_next = lp->ln_next->ln_next;
+	free (ln->ln_name);
+	free (ln);
+}
+
+/*
+ * check_link - see if a file is really a link
+ */
+
+static /*@exposed@*/ /*@null@*/struct link_name *check_link (const char *name, const struct stat *sb)
+{
+	struct link_name *lp;
+	size_t src_len;
+	size_t dst_len;
+	size_t name_len;
+	size_t len;
+
+	/* copy_tree () must be the entry point */
+	assert (NULL != src_orig);
+	assert (NULL != dst_orig);
+
+	for (lp = links; NULL != lp; lp = lp->ln_next) {
+		if ((lp->ln_dev == sb->st_dev) && (lp->ln_ino == sb->st_ino)) {
+			return lp;
+		}
+	}
+
+	if (sb->st_nlink == 1) {
+		return NULL;
+	}
+
+	lp = (struct link_name *) xmalloc (sizeof *lp);
+	src_len = strlen (src_orig);
+	dst_len = strlen (dst_orig);
+	name_len = strlen (name);
+	lp->ln_dev = sb->st_dev;
+	lp->ln_ino = sb->st_ino;
+	lp->ln_count = sb->st_nlink;
+	len = name_len - src_len + dst_len + 1;
+	lp->ln_name = (char *) xmalloc (len);
+	(void) snprintf (lp->ln_name, len, "%s%s", dst_orig, name + src_len);
+	lp->ln_next = links;
+	links = lp;
+
+	return NULL;
+}
+
+/*
+ * copy_tree - copy files in a directory tree
+ *
+ *	copy_tree() walks a directory tree and copies ordinary files
+ *	as it goes.
+ *
+ *	When reset_selinux is enabled, extended attributes (and thus
+ *	SELinux attributes) are not copied.
+ *
+ *	old_uid and new_uid are used to set the ownership of the copied
+ *	files. Unless old_uid is set to -1, only the files owned by
+ *	old_uid have their ownership changed to new_uid. In addition, if
+ *	new_uid is set to -1, no ownership will be changed.
+ *
+ *	The same logic applies for the group-ownership and
+ *	old_gid/new_gid.
+ */
+int copy_tree (const char *src_root, const char *dst_root,
+               bool copy_root, bool reset_selinux,
+               uid_t old_uid, uid_t new_uid,
+               gid_t old_gid, gid_t new_gid)
+{
+	int err = 0;
+	bool set_orig = false;
+	struct DIRECT *ent;
+	DIR *dir;
+
+	if (copy_root) {
+		struct stat sb;
+		if (access (dst_root, F_OK) == 0) {
+			return -1;
+		}
+
+		if (LSTAT (src_root, &sb) == -1) {
+			return -1;
+		}
+
+		if (!S_ISDIR (sb.st_mode)) {
+			fprintf (stderr,
+			         "%s: %s is not a directory",
+			         Prog, src_root);
+			return -1;
+		}
+
+		return copy_entry (src_root, dst_root, reset_selinux,
+		                   old_uid, new_uid, old_gid, new_gid);
+	}
+
+	/*
+	 * Make certain both directories exist.  This routine is called
+	 * after the home directory is created, or recursively after the
+	 * target is created.  It assumes the target directory exists.
+	 */
+
+	if (   (access (src_root, F_OK) != 0)
+	    || (access (dst_root, F_OK) != 0)) {
+		return -1;
+	}
+
+	/*
+	 * Open the source directory and read each entry.  Every file
+	 * entry in the directory is copied with the UID and GID set
+	 * to the provided values.  As an added security feature only
+	 * regular files (and directories ...) are copied, and no file
+	 * is made set-ID.
+	 */
+	dir = opendir (src_root);
+	if (NULL == dir) {
+		return -1;
+	}
+
+	if (src_orig == NULL) {
+		src_orig = src_root;
+		dst_orig = dst_root;
+		set_orig = true;
+	}
+	while ((0 == err) && (ent = readdir (dir)) != NULL) {
+		/*
+		 * Skip the "." and ".." entries
+		 */
+		if ((strcmp (ent->d_name, ".") != 0) &&
+		    (strcmp (ent->d_name, "..") != 0)) {
+			char *src_name;
+			char *dst_name;
+			size_t src_len = strlen (ent->d_name) + 2;
+			size_t dst_len = strlen (ent->d_name) + 2;
+			src_len += strlen (src_root);
+			dst_len += strlen (dst_root);
+
+			src_name = (char *) malloc (src_len);
+			dst_name = (char *) malloc (dst_len);
+
+			if ((NULL == src_name) || (NULL == dst_name)) {
+				err = -1;
+			} else {
+				/*
+				 * Build the filename for both the source and
+				 * the destination files.
+				 */
+				(void) snprintf (src_name, src_len, "%s/%s",
+				                 src_root, ent->d_name);
+				(void) snprintf (dst_name, dst_len, "%s/%s",
+				                 dst_root, ent->d_name);
+
+				err = copy_entry (src_name, dst_name,
+				                  reset_selinux,
+				                  old_uid, new_uid,
+				                  old_gid, new_gid);
+			}
+			if (NULL != src_name) {
+				free (src_name);
+			}
+			if (NULL != dst_name) {
+				free (dst_name);
+			}
+		}
+	}
+	(void) closedir (dir);
+
+	if (set_orig) {
+		src_orig = NULL;
+		dst_orig = NULL;
+		/* FIXME: clean links
+		 * Since there can be hardlinks elsewhere on the device,
+		 * we cannot check that all the hardlinks were found:
+		assert (NULL == links);
+		 */
+	}
+
+#ifdef WITH_SELINUX
+	/* Reset SELinux to create files with default contexts.
+	 * Note that the context is only reset on exit of copy_tree (it is
+	 * assumed that the program would quit without needing a restored
+	 * context if copy_tree failed previously), and that copy_tree can
+	 * be called recursively (hence the context is set on the
+	 * sub-functions of copy_entry).
+	 */
+	if (reset_selinux_file_context () != 0) {
+		err = -1;
+	}
+#endif				/* WITH_SELINUX */
+
+	return err;
+}
+
+/*
+ * copy_entry - copy the entry of a directory
+ *
+ *	Copy the entry src to dst.
+ *	Depending on the type of entry, this function will forward the
+ *	request to copy_dir(), copy_symlink(), copy_hardlink(),
+ *	copy_special(), or copy_file().
+ *
+ *	The access and modification time will not be modified.
+ *
+ *	The permissions will be set to new_uid/new_gid.
+ *
+ *	If new_uid (resp. new_gid) is equal to -1, the user (resp. group) will
+ *	not be modified.
+ *
+ *	Only the files owned (resp. group-owned) by old_uid (resp.
+ *	old_gid) will be modified, unless old_uid (resp. old_gid) is set
+ *	to -1.
+ */
+static int copy_entry (const char *src, const char *dst,
+                       bool reset_selinux,
+                       uid_t old_uid, uid_t new_uid,
+                       gid_t old_gid, gid_t new_gid)
+{
+	int err = 0;
+	struct stat sb;
+	struct link_name *lp;
+	struct timeval mt[2];
+
+	if (LSTAT (src, &sb) == -1) {
+		/* If we cannot stat the file, do not care. */
+	} else {
+#ifdef HAVE_STRUCT_STAT_ST_ATIM
+		mt[0].tv_sec  = sb.st_atim.tv_sec;
+		mt[0].tv_usec = sb.st_atim.tv_nsec / 1000;
+#else				/* !HAVE_STRUCT_STAT_ST_ATIM */
+		mt[0].tv_sec  = sb.st_atime;
+# ifdef HAVE_STRUCT_STAT_ST_ATIMENSEC
+		mt[0].tv_usec = sb.st_atimensec / 1000;
+# else				/* !HAVE_STRUCT_STAT_ST_ATIMENSEC */
+		mt[0].tv_usec = 0;
+# endif				/* !HAVE_STRUCT_STAT_ST_ATIMENSEC */
+#endif				/* !HAVE_STRUCT_STAT_ST_ATIM */
+
+#ifdef HAVE_STRUCT_STAT_ST_MTIM
+		mt[1].tv_sec  = sb.st_mtim.tv_sec;
+		mt[1].tv_usec = sb.st_mtim.tv_nsec / 1000;
+#else				/* !HAVE_STRUCT_STAT_ST_MTIM */
+		mt[1].tv_sec  = sb.st_mtime;
+# ifdef HAVE_STRUCT_STAT_ST_MTIMENSEC
+		mt[1].tv_usec = sb.st_mtimensec / 1000;
+# else				/* !HAVE_STRUCT_STAT_ST_MTIMENSEC */
+		mt[1].tv_usec = 0;
+# endif				/* !HAVE_STRUCT_STAT_ST_MTIMENSEC */
+#endif				/* !HAVE_STRUCT_STAT_ST_MTIM */
+
+		if (S_ISDIR (sb.st_mode)) {
+			err = copy_dir (src, dst, reset_selinux, &sb, mt,
+			                old_uid, new_uid, old_gid, new_gid);
+		}
+
+#ifdef	S_IFLNK
+		/*
+		 * Copy any symbolic links
+		 */
+
+		else if (S_ISLNK (sb.st_mode)) {
+			err = copy_symlink (src, dst, reset_selinux, &sb, mt,
+			                    old_uid, new_uid, old_gid, new_gid);
+		}
+#endif				/* S_IFLNK */
+
+		/*
+		 * See if this is a previously copied link
+		 */
+
+		else if ((lp = check_link (src, &sb)) != NULL) {
+			err = copy_hardlink (dst, reset_selinux, lp);
+		}
+
+		/*
+		 * Deal with FIFOs and special files.  The user really
+		 * shouldn't have any of these, but it seems like it
+		 * would be nice to copy everything ...
+		 */
+
+		else if (!S_ISREG (sb.st_mode)) {
+			err = copy_special (src, dst, reset_selinux, &sb, mt,
+			                    old_uid, new_uid, old_gid, new_gid);
+		}
+
+		/*
+		 * Create the new file and copy the contents.  The new
+		 * file will be owned by the provided UID and GID values.
+		 */
+
+		else {
+			err = copy_file (src, dst, reset_selinux, &sb, mt,
+			                 old_uid, new_uid, old_gid, new_gid);
+		}
+	}
+
+	return err;
+}
+
+/*
+ * copy_dir - copy a directory
+ *
+ *	Copy a directory (recursively) from src to dst.
+ *
+ *	statp, mt, old_uid, new_uid, old_gid, and new_gid are used to set
+ *	the access and modification and the access rights.
+ *
+ *	Return 0 on success, -1 on error.
+ */
+static int copy_dir (const char *src, const char *dst,
+                     bool reset_selinux,
+                     const struct stat *statp, const struct timeval mt[],
+                     uid_t old_uid, uid_t new_uid,
+                     gid_t old_gid, gid_t new_gid)
+{
+	int err = 0;
+
+	/*
+	 * Create a new target directory, make it owned by
+	 * the user and then recursively copy that directory.
+	 */
+
+#ifdef WITH_SELINUX
+	if (set_selinux_file_context (dst) != 0) {
+		return -1;
+	}
+#endif				/* WITH_SELINUX */
+	if (   (mkdir (dst, statp->st_mode) != 0)
+	    || (chown_if_needed (dst, statp,
+	                         old_uid, new_uid, old_gid, new_gid) != 0)
+#ifdef WITH_ACL
+	    || (   (perm_copy_file (src, dst, &ctx) != 0)
+	        && (errno != 0))
+#else				/* !WITH_ACL */
+	    || (chmod (dst, statp->st_mode) != 0)
+#endif				/* !WITH_ACL */
+#ifdef WITH_ATTR
+	/*
+	 * If the third parameter is NULL, all extended attributes
+	 * except those that define Access Control Lists are copied.
+	 * ACLs are excluded by default because copying them between
+	 * file systems with and without ACL support needs some
+	 * additional logic so that no unexpected permissions result.
+	 */
+	    || (   !reset_selinux
+	        && (attr_copy_file (src, dst, NULL, &ctx) != 0)
+	        && (errno != 0))
+#endif				/* WITH_ATTR */
+	    || (copy_tree (src, dst, false, reset_selinux,
+	                   old_uid, new_uid, old_gid, new_gid) != 0)
+	    || (utimes (dst, mt) != 0)) {
+		err = -1;
+	}
+
+	return err;
+}
+
+#ifdef	S_IFLNK
+/*
+ * readlink_malloc - wrapper for readlink
+ *
+ * return NULL on error.
+ * The return string shall be freed by the caller.
+ */
+static /*@null@*/char *readlink_malloc (const char *filename)
+{
+	size_t size = 1024;
+
+	while (true) {
+		ssize_t nchars;
+		char *buffer = (char *) malloc (size);
+		if (NULL == buffer) {
+			return NULL;
+		}
+
+		nchars = readlink (filename, buffer, size);
+
+		if (nchars < 0) {
+			free(buffer);
+			return NULL;
+		}
+
+		if ((size_t) nchars < size) { /* The buffer was large enough */
+			/* readlink does not nul-terminate */
+			buffer[nchars] = '\0';
+			return buffer;
+		}
+
+		/* Try again with a bigger buffer */
+		free (buffer);
+		size *= 2;
+	}
+}
+
+/*
+ * copy_symlink - copy a symlink
+ *
+ *	Copy a symlink from src to dst.
+ *
+ *	statp, mt, old_uid, new_uid, old_gid, and new_gid are used to set
+ *	the access and modification and the access rights.
+ *
+ *	Return 0 on success, -1 on error.
+ */
+static int copy_symlink (const char *src, const char *dst,
+                         unused bool reset_selinux,
+                         const struct stat *statp, const struct timeval mt[],
+                         uid_t old_uid, uid_t new_uid,
+                         gid_t old_gid, gid_t new_gid)
+{
+	char *oldlink;
+
+	/* copy_tree () must be the entry point */
+	assert (NULL != src_orig);
+	assert (NULL != dst_orig);
+
+	/*
+	 * Get the name of the file which the link points
+	 * to.  If that name begins with the original
+	 * source directory name, that part of the link
+	 * name will be replaced with the original
+	 * destination directory name.
+	 */
+
+	oldlink = readlink_malloc (src);
+	if (NULL == oldlink) {
+		return -1;
+	}
+
+	/* If src was a link to an entry of the src_orig directory itself,
+	 * create a link to the corresponding entry in the dst_orig
+	 * directory.
+	 */
+	if (strncmp (oldlink, src_orig, strlen (src_orig)) == 0) {
+		size_t len = strlen (dst_orig) + strlen (oldlink) - strlen (src_orig) + 1;
+		char *dummy = (char *) xmalloc (len);
+		(void) snprintf (dummy, len, "%s%s",
+		                 dst_orig,
+		                 oldlink + strlen (src_orig));
+		free (oldlink);
+		oldlink = dummy;
+	}
+
+#ifdef WITH_SELINUX
+	if (set_selinux_file_context (dst) != 0) {
+		free (oldlink);
+		return -1;
+	}
+#endif				/* WITH_SELINUX */
+	if (   (symlink (oldlink, dst) != 0)
+	    || (lchown_if_needed (dst, statp,
+	                          old_uid, new_uid, old_gid, new_gid) != 0)) {
+		/* FIXME: there are no modes on symlinks, right?
+		 *        ACL could be copied, but this would be much more
+		 *        complex than calling perm_copy_file.
+		 *        Ditto for Extended Attributes.
+		 *        We currently only document that ACL and Extended
+		 *        Attributes are not copied.
+		 */
+		free (oldlink);
+		return -1;
+	}
+	free (oldlink);
+
+#ifdef HAVE_LUTIMES
+	/* 2007-10-18: We don't care about
+	 *  exit status of lutimes because
+	 *  it returns ENOSYS on many system
+	 *  - not implemented
+	 */
+	(void) lutimes (dst, mt);
+#endif				/* HAVE_LUTIMES */
+
+	return 0;
+}
+#endif				/* S_IFLNK */
+
+/*
+ * copy_hardlink - copy a hardlink
+ *
+ *	Copy a hardlink from src to dst.
+ *
+ *	Return 0 on success, -1 on error.
+ */
+static int copy_hardlink (const char *dst,
+                          unused bool reset_selinux,
+                          struct link_name *lp)
+{
+	/* FIXME: selinux, ACL, Extended Attributes needed? */
+
+	if (link (lp->ln_name, dst) != 0) {
+		return -1;
+	}
+
+	/* If the file could be unlinked, decrement the links counter,
+	 * and forget about this link if it was the last reference */
+	lp->ln_count--;
+	if (lp->ln_count <= 0) {
+		remove_link (lp);
+	}
+
+	return 0;
+}
+
+/*
+ * copy_special - copy a special file
+ *
+ *	Copy a special file from src to dst.
+ *
+ *	statp, mt, old_uid, new_uid, old_gid, and new_gid are used to set
+ *	the access and modification and the access rights.
+ *
+ *	Return 0 on success, -1 on error.
+ */
+static int copy_special (const char *src, const char *dst,
+                         bool reset_selinux,
+                         const struct stat *statp, const struct timeval mt[],
+                         uid_t old_uid, uid_t new_uid,
+                         gid_t old_gid, gid_t new_gid)
+{
+	int err = 0;
+
+#ifdef WITH_SELINUX
+	if (set_selinux_file_context (dst) != 0) {
+		return -1;
+	}
+#endif				/* WITH_SELINUX */
+
+	if (   (mknod (dst, statp->st_mode & ~07777, statp->st_rdev) != 0)
+	    || (chown_if_needed (dst, statp,
+	                         old_uid, new_uid, old_gid, new_gid) != 0)
+#ifdef WITH_ACL
+	    || (   (perm_copy_file (src, dst, &ctx) != 0)
+	        && (errno != 0))
+#else				/* !WITH_ACL */
+	    || (chmod (dst, statp->st_mode & 07777) != 0)
+#endif				/* !WITH_ACL */
+#ifdef WITH_ATTR
+	/*
+	 * If the third parameter is NULL, all extended attributes
+	 * except those that define Access Control Lists are copied.
+	 * ACLs are excluded by default because copying them between
+	 * file systems with and without ACL support needs some
+	 * additional logic so that no unexpected permissions result.
+	 */
+	    || (   !reset_selinux
+	        && (attr_copy_file (src, dst, NULL, &ctx) != 0)
+	        && (errno != 0))
+#endif				/* WITH_ATTR */
+	    || (utimes (dst, mt) != 0)) {
+		err = -1;
+	}
+
+	return err;
+}
+
+/*
+ * copy_file - copy a file
+ *
+ *	Copy a file from src to dst.
+ *
+ *	statp, mt, old_uid, new_uid, old_gid, and new_gid are used to set
+ *	the access and modification and the access rights.
+ *
+ *	Return 0 on success, -1 on error.
+ */
+static int copy_file (const char *src, const char *dst,
+                      bool reset_selinux,
+                      const struct stat *statp, const struct timeval mt[],
+                      uid_t old_uid, uid_t new_uid,
+                      gid_t old_gid, gid_t new_gid)
+{
+	int err = 0;
+	int ifd;
+	int ofd;
+	char buf[1024];
+	ssize_t cnt;
+
+	ifd = open (src, O_RDONLY);
+	if (ifd < 0) {
+		return -1;
+	}
+#ifdef WITH_SELINUX
+	if (set_selinux_file_context (dst) != 0) {
+		return -1;
+	}
+#endif				/* WITH_SELINUX */
+	ofd = open (dst, O_WRONLY | O_CREAT | O_TRUNC, statp->st_mode & 07777);
+	if (   (ofd < 0)
+	    || (fchown_if_needed (ofd, statp,
+	                          old_uid, new_uid, old_gid, new_gid) != 0)
+#ifdef WITH_ACL
+	    || (   (perm_copy_fd (src, ifd, dst, ofd, &ctx) != 0)
+	        && (errno != 0))
+#else				/* !WITH_ACL */
+	    || (fchmod (ofd, statp->st_mode & 07777) != 0)
+#endif				/* !WITH_ACL */
+#ifdef WITH_ATTR
+	/*
+	 * If the third parameter is NULL, all extended attributes
+	 * except those that define Access Control Lists are copied.
+	 * ACLs are excluded by default because copying them between
+	 * file systems with and without ACL support needs some
+	 * additional logic so that no unexpected permissions result.
+	 */
+	    || (   !reset_selinux
+	        && (attr_copy_fd (src, ifd, dst, ofd, NULL, &ctx) != 0)
+	        && (errno != 0))
+#endif				/* WITH_ATTR */
+	   ) {
+		(void) close (ifd);
+		return -1;
+	}
+
+	while ((cnt = read (ifd, buf, sizeof buf)) > 0) {
+		if (write (ofd, buf, (size_t)cnt) != cnt) {
+			(void) close (ifd);
+			return -1;
+		}
+	}
+
+	(void) close (ifd);
+
+#ifdef HAVE_FUTIMES
+	if (futimes (ofd, mt) != 0) {
+		return -1;
+	}
+#endif				/* HAVE_FUTIMES */
+
+	if (close (ofd) != 0) {
+		return -1;
+	}
+
+#ifndef HAVE_FUTIMES
+	if (utimes(dst, mt) != 0) {
+		return -1;
+	}
+#endif				/* !HAVE_FUTIMES */
+
+	return err;
+}
+
+#define def_chown_if_needed(chown_function, type_dst)                  \
+static int chown_function ## _if_needed (type_dst dst,                 \
+                                         const struct stat *statp,     \
+                                         uid_t old_uid, uid_t new_uid, \
+                                         gid_t old_gid, gid_t new_gid) \
+{                                                                      \
+	uid_t tmpuid = (uid_t) -1;                                     \
+	gid_t tmpgid = (gid_t) -1;                                     \
+                                                                       \
+	/* Use new_uid if old_uid is set to -1 or if the file was      \
+	 * owned by the user. */                                       \
+	if (((uid_t) -1 == old_uid) || (statp->st_uid == old_uid)) {   \
+		tmpuid = new_uid;                                      \
+	}                                                              \
+	/* Otherwise, or if new_uid was set to -1, we keep the same    \
+	 * owner. */                                                   \
+	if ((uid_t) -1 == tmpuid) {                                    \
+		tmpuid = statp->st_uid;                                \
+	}                                                              \
+                                                                       \
+	if (((gid_t) -1 == old_gid) || (statp->st_gid == old_gid)) {   \
+		tmpgid = new_gid;                                      \
+	}                                                              \
+	if ((gid_t) -1 == tmpgid) {                                    \
+		tmpgid = statp->st_gid;                                \
+	}                                                              \
+                                                                       \
+	return chown_function (dst, tmpuid, tmpgid);                   \
+}
+
+def_chown_if_needed (chown, const char *)
+def_chown_if_needed (lchown, const char *)
+def_chown_if_needed (fchown, int)
+