pw/rm_r.c

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