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/*
* SPDX-FileCopyrightText: 1992 - 1993, Julianne Frances Haugh
* SPDX-FileCopyrightText: 1996 - 2000, Marek Michałkiewicz
* SPDX-FileCopyrightText: 2003 - 2005, Tomasz Kłoczko
* SPDX-FileCopyrightText: 2010 - , Nicolas François
*
* SPDX-License-Identifier: BSD-3-Clause
*/
#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>
#include <unistd.h>
static int chown_tree_at (int at_fd,
const char *path,
uid_t old_uid,
uid_t new_uid,
gid_t old_gid,
gid_t new_gid)
{
DIR *dir;
const struct dirent *ent;
struct stat dir_sb;
int dir_fd, rc = 0;
dir_fd = openat (at_fd, path, O_RDONLY | O_DIRECTORY | O_NOFOLLOW | O_CLOEXEC);
if (dir_fd < 0) {
return -1;
}
dir = fdopendir (dir_fd);
if (!dir) {
(void) close (dir_fd);
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.
*/
while ((ent = readdir (dir))) {
uid_t tmpuid = (uid_t) -1;
gid_t tmpgid = (gid_t) -1;
struct stat ent_sb;
/*
* Skip the "." and ".." entries
*/
if ( (strcmp (ent->d_name, ".") == 0)
|| (strcmp (ent->d_name, "..") == 0)) {
continue;
}
rc = fstatat (dirfd(dir), ent->d_name, &ent_sb, AT_SYMLINK_NOFOLLOW);
if (rc < 0) {
break;
}
if (S_ISDIR (ent_sb.st_mode)) {
/*
* Do the entire subdirectory.
*/
rc = chown_tree_at (dirfd(dir), ent->d_name, old_uid, new_uid, old_gid, new_gid);
if (0 != rc) {
break;
}
}
/*
* 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) || (ent_sb.st_uid == old_uid)) {
tmpuid = new_uid;
}
if (((gid_t) -1 == old_gid) || (ent_sb.st_gid == old_gid)) {
tmpgid = new_gid;
}
if (((uid_t) -1 != tmpuid) || ((gid_t) -1 != tmpgid)) {
rc = fchownat (dirfd(dir), ent->d_name, tmpuid, tmpgid, AT_SYMLINK_NOFOLLOW);
if (0 != rc) {
break;
}
}
}
/*
* Now do the root of the tree
*/
if ((0 == rc) && (fstat (dirfd(dir), &dir_sb) == 0)) {
uid_t tmpuid = (uid_t) -1;
gid_t tmpgid = (gid_t) -1;
if (((uid_t) -1 == old_uid) || (dir_sb.st_uid == old_uid)) {
tmpuid = new_uid;
}
if (((gid_t) -1 == old_gid) || (dir_sb.st_gid == old_gid)) {
tmpgid = new_gid;
}
if (((uid_t) -1 != tmpuid) || ((gid_t) -1 != tmpgid)) {
rc = fchown (dirfd(dir), tmpuid, tmpgid);
}
} else {
rc = -1;
}
(void) closedir (dir);
return rc;
}
/*
* 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)
{
return chown_tree_at (AT_FDCWD, root, old_uid, new_uid, old_gid, new_gid);
}
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