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 <dirent.h> 30 #include <err.h> 31 #include <errno.h> 32 #include <fcntl.h> 33 #include <string.h> 34 #include <unistd.h> 35 36 #include "pw.h" 37 38 void 39 copymkdir(int rootfd, char const *dir, int skelfd, mode_t mode, uid_t uid, 40 gid_t gid, int flags) 41 { 42 char *p, lnk[MAXPATHLEN]; 43 int len, srcfd, destfd; 44 ssize_t sz; 45 struct stat st; 46 struct dirent *e; 47 DIR *d; 48 mode_t pumask; 49 50 if (*dir == '/') 51 dir++; 52 53 pumask = umask(0); 54 umask(pumask); 55 56 if (mkdirat(rootfd, dir, mode) != 0) { 57 58 if (errno != EEXIST) { 59 warn("mkdir(%s)", dir); 60 return; 61 } 62 63 if (fchmodat(rootfd, dir, mode & ~pumask, 64 AT_SYMLINK_NOFOLLOW) == -1) 65 warn("chmod(%s)", dir); 66 } 67 if (fchownat(rootfd, dir, uid, gid, AT_SYMLINK_NOFOLLOW) == -1) 68 warn("chown(%s)", dir); 69 if (flags > 0 && chflagsat(rootfd, dir, flags, 70 AT_SYMLINK_NOFOLLOW) == -1) 71 warn("chflags(%s)", dir); 72 metalog_emit(dir, (mode | S_IFDIR) & ~pumask, uid, gid, flags); 73 74 if (skelfd == -1) 75 return; 76 77 if ((d = fdopendir(skelfd)) == NULL) { 78 close(skelfd); 79 return; 80 } 81 82 while ((e = readdir(d)) != NULL) { 83 char path[MAXPATHLEN]; 84 85 if (strcmp(e->d_name, ".") == 0 || strcmp(e->d_name, "..") == 0) 86 continue; 87 88 p = e->d_name; 89 if (fstatat(skelfd, p, &st, AT_SYMLINK_NOFOLLOW) == -1) 90 continue; 91 92 if (strncmp(p, "dot.", 4) == 0) /* Conversion */ 93 p += 3; 94 (void)snprintf(path, sizeof(path), "%s/%s", dir, p); 95 96 if (S_ISDIR(st.st_mode)) { 97 int fd; 98 99 fd = openat(skelfd, e->d_name, O_DIRECTORY); 100 if (fd == -1) { 101 warn("openat(%s)", e->d_name); 102 continue; 103 } 104 copymkdir(rootfd, path, fd, st.st_mode & _DEF_DIRMODE, 105 uid, gid, st.st_flags); 106 continue; 107 } 108 109 if (S_ISLNK(st.st_mode) && 110 (len = readlinkat(skelfd, e->d_name, lnk, sizeof(lnk) - 1)) 111 != -1) { 112 lnk[len] = '\0'; 113 if (symlinkat(lnk, rootfd, path) != 0) 114 warn("symlink(%s)", path); 115 else if (fchownat(rootfd, path, uid, gid, 116 AT_SYMLINK_NOFOLLOW) != 0) 117 warn("chown(%s)", path); 118 metalog_emit_symlink(path, lnk, st.st_mode & ~pumask, 119 uid, gid); 120 continue; 121 } 122 123 if (!S_ISREG(st.st_mode)) 124 continue; 125 126 if ((srcfd = openat(skelfd, e->d_name, O_RDONLY)) == -1) 127 continue; 128 destfd = openat(rootfd, path, O_RDWR | O_CREAT | O_EXCL, 129 st.st_mode); 130 if (destfd == -1) { 131 close(srcfd); 132 continue; 133 } 134 135 do { 136 sz = copy_file_range(srcfd, NULL, destfd, NULL, 137 SSIZE_MAX, 0); 138 } while (sz > 0); 139 if (sz < 0) 140 warn("copy_file_range"); 141 142 close(srcfd); 143 /* 144 * Propagate special filesystem flags 145 */ 146 if (fchown(destfd, uid, gid) != 0) 147 warn("chown(%s)", p); 148 if (fchflags(destfd, st.st_flags) != 0) 149 warn("chflags(%s)", p); 150 metalog_emit(path, st.st_mode & ~pumask, uid, gid, st.st_flags); 151 close(destfd); 152 } 153 closedir(d); 154 } 155