1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause 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 #include <sys/stat.h> 30 31 #include <dirent.h> 32 #include <fcntl.h> 33 #include <string.h> 34 #include <unistd.h> 35 36 #include "pwupd.h" 37 38 void 39 rm_r(int rootfd, const char *path, uid_t uid) 40 { 41 int dirfd; 42 DIR *d; 43 struct dirent *e; 44 struct stat st; 45 46 if (*path == '/') 47 path++; 48 49 dirfd = openat(rootfd, path, O_DIRECTORY); 50 if (dirfd == -1) { 51 return; 52 } 53 54 d = fdopendir(dirfd); 55 if (d == NULL) { 56 (void)close(dirfd); 57 return; 58 } 59 while ((e = readdir(d)) != NULL) { 60 if (strcmp(e->d_name, ".") == 0 || strcmp(e->d_name, "..") == 0) 61 continue; 62 63 if (fstatat(dirfd, e->d_name, &st, AT_SYMLINK_NOFOLLOW) != 0) 64 continue; 65 if (S_ISDIR(st.st_mode)) 66 rm_r(dirfd, e->d_name, uid); 67 else if (S_ISLNK(st.st_mode) || st.st_uid == uid) 68 unlinkat(dirfd, e->d_name, 0); 69 } 70 closedir(d); 71 if (fstatat(rootfd, path, &st, AT_SYMLINK_NOFOLLOW) != 0) 72 return; 73 if (S_ISLNK(st.st_mode)) 74 unlinkat(rootfd, path, 0); 75 else if (st.st_uid == uid) 76 unlinkat(rootfd, path, AT_REMOVEDIR); 77 } 78