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Diffstat (limited to 'libmisc/chowndir.c')
| -rw-r--r-- | libmisc/chowndir.c | 201 |
1 files changed, 201 insertions, 0 deletions
diff --git a/libmisc/chowndir.c b/libmisc/chowndir.c new file mode 100644 index 00000000..b5a894e6 --- /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: chowndir.c 3465 2011-08-14 14:00:14Z nekral-guest $" + +#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; +} + |