pw/rm_r.c

   1 /*-
   2  * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
   3  *
   4  * Copyright (C) 1996
   5  *      David L. Nugent.  All rights reserved.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions and the following disclaimer.
  12  * 2. Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in the
  14  *    documentation and/or other materials provided with the distribution.
  15  *
  16  * THIS SOFTWARE IS PROVIDED BY DAVID L. NUGENT AND CONTRIBUTORS ``AS IS'' AND
  17  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  18  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  19  * ARE DISCLAIMED.  IN NO EVENT SHALL DAVID L. NUGENT OR CONTRIBUTORS BE LIABLE
  20  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  21  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  22  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  23  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  24  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  25  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  26  * SUCH DAMAGE.
  27  */
  28
  29 #ifndef lint
  30 static const char rcsid[] =
  31   "$FreeBSD$";
  32 #endif /* not lint */
  33
  34 #include <sys/stat.h>
  35
  36 #include <dirent.h>
  37 #include <fcntl.h>
  38 #include <string.h>
  39 #include <unistd.h>
  40
  41 #include "pwupd.h"
  42
  43 void
  44 rm_r(int rootfd, const char *path, uid_t uid)
  45 {
  46         int dirfd;
  47         DIR *d;
  48         struct dirent  *e;
  49         struct stat     st;
  50
  51         if (*path == '/')
  52                 path++;
  53
  54         dirfd = openat(rootfd, path, O_DIRECTORY);
  55         if (dirfd == -1) {
  56                 return;
  57         }
  58
  59         d = fdopendir(dirfd);
  60         if (d == NULL) {
  61                 (void)close(dirfd);
  62                 return;
  63         }
  64         while ((e = readdir(d)) != NULL) {
  65                 if (strcmp(e->d_name, ".") == 0 || strcmp(e->d_name, "..") == 0)
  66                         continue;
  67
  68                 if (fstatat(dirfd, e->d_name, &st, AT_SYMLINK_NOFOLLOW) != 0)
  69                         continue;
  70                 if (S_ISDIR(st.st_mode))
  71                         rm_r(dirfd, e->d_name, uid);
  72                 else if (S_ISLNK(st.st_mode) || st.st_uid == uid)
  73                         unlinkat(dirfd, e->d_name, 0);
  74         }
  75         closedir(d);
  76         if (fstatat(rootfd, path, &st, AT_SYMLINK_NOFOLLOW) != 0)
  77                 return;
  78         if (S_ISLNK(st.st_mode))
  79                 unlinkat(rootfd, path, 0);
  80         else if (st.st_uid == uid)
  81                 unlinkat(rootfd, path, AT_REMOVEDIR);
  82 }