shadow/libmisc/chowndir.c

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/*
* 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.
*/
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[1024];
int rc = 0;
struct DIRECT *ent;
struct stat sb;
DIR *dir;
/*
* Make certain the directory exists. This routine is called
* directory by the invoker, or recursively.
*/
if (access (root, F_OK) != 0) {
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 it is owned by
* old user ID.
*/
dir = opendir (root);
if (NULL == dir) {
return -1;
}
while ((ent = readdir (dir))) {
/*
* 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.
*/
if (strlen (root) + strlen (ent->d_name) + 2 > sizeof new_name) {
break;
}
snprintf (new_name, sizeof new_name, "%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
if (sb.st_uid == old_uid) {
LCHOWN (new_name, new_uid,
(sb.st_gid == old_gid) ? new_gid : sb.st_gid);
}
}
(void) closedir (dir);
/*
* Now do the root of the tree
*/
if (stat (root, &sb) == 0) {
if (sb.st_uid == old_uid) {
LCHOWN (root, new_uid,
sb.st_gid == old_gid ? new_gid : sb.st_gid);
}
}
return rc;
}