summaryrefslogtreecommitdiffstats
path: root/libmisc/chowndir.c
diff options
context:
space:
mode:
Diffstat (limited to '')
-rw-r--r--libmisc/chowndir.c201
1 files changed, 201 insertions, 0 deletions
diff --git a/libmisc/chowndir.c b/libmisc/chowndir.c
new file mode 100644
index 0000000..c4c504a
--- /dev/null
+++ b/libmisc/chowndir.c
@@ -0,0 +1,201 @@
+/*
+ * Copyright (c) 1992 - 1993, Julianne Frances Haugh
+ * Copyright (c) 1996 - 2000, Marek Michałkiewicz
+ * Copyright (c) 2003 - 2005, Tomasz Kłoczko
+ * Copyright (c) 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 <sys/types.h>
+#include <sys/stat.h>
+#include "prototypes.h"
+#include "defines.h"
+#include <fcntl.h>
+#include <stdio.h>
+/*
+ * chown_tree - change ownership of files in a directory tree
+ *
+ * chown_dir() walks a directory tree and changes the ownership
+ * of all files owned by the provided user ID.
+ *
+ * Only files owned (resp. group-owned) by old_uid (resp. by old_gid)
+ * will have their ownership (resp. group-ownership) modified, unless
+ * old_uid (resp. old_gid) is set to -1.
+ *
+ * new_uid and new_gid can be set to -1 to indicate that no owner or
+ * group-owner shall be changed.
+ */
+int chown_tree (const char *root,
+ uid_t old_uid,
+ uid_t new_uid,
+ gid_t old_gid,
+ gid_t new_gid)
+{
+ char *new_name;
+ size_t new_name_len;
+ int rc = 0;
+ struct DIRECT *ent;
+ struct stat sb;
+ DIR *dir;
+
+ new_name = malloc (1024);
+ if (NULL == new_name) {
+ return -1;
+ }
+ new_name_len = 1024;
+
+ /*
+ * Make certain the directory exists. This routine is called
+ * directly by the invoker, or recursively.
+ */
+
+ if (access (root, F_OK) != 0) {
+ free (new_name);
+ return -1;
+ }
+
+ /*
+ * Open the directory and read each entry. Every entry is tested
+ * to see if it is a directory, and if so this routine is called
+ * recursively. If not, it is checked to see if an ownership
+ * shall be changed.
+ */
+
+ dir = opendir (root);
+ if (NULL == dir) {
+ free (new_name);
+ return -1;
+ }
+
+ while ((ent = readdir (dir))) {
+ size_t ent_name_len;
+ uid_t tmpuid = (uid_t) -1;
+ gid_t tmpgid = (gid_t) -1;
+
+ /*
+ * Skip the "." and ".." entries
+ */
+
+ if ( (strcmp (ent->d_name, ".") == 0)
+ || (strcmp (ent->d_name, "..") == 0)) {
+ continue;
+ }
+
+ /*
+ * Make the filename for both the source and the
+ * destination files.
+ */
+
+ ent_name_len = strlen (root) + strlen (ent->d_name) + 2;
+ if (ent_name_len > new_name_len) {
+ /*@only@*/char *tmp = realloc (new_name, ent_name_len);
+ if (NULL == tmp) {
+ rc = -1;
+ break;
+ }
+ new_name = tmp;
+ new_name_len = ent_name_len;
+ }
+
+ (void) snprintf (new_name, new_name_len, "%s/%s", root, ent->d_name);
+
+ /* Don't follow symbolic links! */
+ if (LSTAT (new_name, &sb) == -1) {
+ continue;
+ }
+
+ if (S_ISDIR (sb.st_mode) && !S_ISLNK (sb.st_mode)) {
+
+ /*
+ * Do the entire subdirectory.
+ */
+
+ rc = chown_tree (new_name, old_uid, new_uid,
+ old_gid, new_gid);
+ if (0 != rc) {
+ break;
+ }
+ }
+#ifndef HAVE_LCHOWN
+ /* don't use chown (follows symbolic links!) */
+ if (S_ISLNK (sb.st_mode)) {
+ continue;
+ }
+#endif
+ /*
+ * By default, the IDs are not changed (-1).
+ *
+ * If the file is not owned by the user, the owner is not
+ * changed.
+ *
+ * If the file is not group-owned by the group, the
+ * group-owner is not changed.
+ */
+ if (((uid_t) -1 == old_uid) || (sb.st_uid == old_uid)) {
+ tmpuid = new_uid;
+ }
+ if (((gid_t) -1 == old_gid) || (sb.st_gid == old_gid)) {
+ tmpgid = new_gid;
+ }
+ if (((uid_t) -1 != tmpuid) || ((gid_t) -1 != tmpgid)) {
+ rc = LCHOWN (new_name, tmpuid, tmpgid);
+ if (0 != rc) {
+ break;
+ }
+ }
+ }
+
+ free (new_name);
+ (void) closedir (dir);
+
+ /*
+ * Now do the root of the tree
+ */
+
+ if ((0 == rc) && (stat (root, &sb) == 0)) {
+ uid_t tmpuid = (uid_t) -1;
+ gid_t tmpgid = (gid_t) -1;
+ if (((uid_t) -1 == old_uid) || (sb.st_uid == old_uid)) {
+ tmpuid = new_uid;
+ }
+ if (((gid_t) -1 == old_gid) || (sb.st_gid == old_gid)) {
+ tmpgid = new_gid;
+ }
+ if (((uid_t) -1 != tmpuid) || ((gid_t) -1 != tmpgid)) {
+ rc = LCHOWN (root, tmpuid, tmpgid);
+ }
+ } else {
+ rc = -1;
+ }
+
+ return rc;
+}
+