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], copybuf[4096]; 43 int len, homefd, srcfd, destfd; 44 ssize_t sz; 45 struct stat st; 46 struct dirent *e; 47 DIR *d; 48 49 if (*dir == '/') 50 dir++; 51 52 if (mkdirat(rootfd, dir, mode) != 0) { 53 mode_t pumask; 54 55 if (errno != EEXIST) { 56 warn("mkdir(%s)", dir); 57 return; 58 } 59 60 pumask = umask(0); 61 umask(pumask); 62 63 if (fchmodat(rootfd, dir, mode & ~pumask, 64 AT_SYMLINK_NOFOLLOW) == -1) 65 warn("chmod(%s)", dir); 66 } 67 68 if (fchownat(rootfd, dir, uid, gid, AT_SYMLINK_NOFOLLOW) == -1) 69 warn("chown(%s)", dir); 70 71 if (flags > 0 && chflagsat(rootfd, dir, flags, 72 AT_SYMLINK_NOFOLLOW) == -1) 73 warn("chflags(%s)", dir); 74 75 if (skelfd == -1) 76 return; 77 78 homefd = openat(rootfd, dir, O_DIRECTORY); 79 if ((d = fdopendir(skelfd)) == NULL) { 80 close(skelfd); 81 close(homefd); 82 return; 83 } 84 85 while ((e = readdir(d)) != NULL) { 86 if (strcmp(e->d_name, ".") == 0 || strcmp(e->d_name, "..") == 0) 87 continue; 88 89 p = e->d_name; 90 if (fstatat(skelfd, p, &st, AT_SYMLINK_NOFOLLOW) == -1) 91 continue; 92 93 if (strncmp(p, "dot.", 4) == 0) /* Conversion */ 94 p += 3; 95 96 if (S_ISDIR(st.st_mode)) { 97 copymkdir(homefd, p, openat(skelfd, e->d_name, O_DIRECTORY), 98 st.st_mode & _DEF_DIRMODE, uid, gid, st.st_flags); 99 continue; 100 } 101 102 if (S_ISLNK(st.st_mode) && 103 (len = readlinkat(skelfd, e->d_name, lnk, sizeof(lnk) -1)) 104 != -1) { 105 lnk[len] = '\0'; 106 symlinkat(lnk, homefd, p); 107 fchownat(homefd, p, uid, gid, AT_SYMLINK_NOFOLLOW); 108 continue; 109 } 110 111 if (!S_ISREG(st.st_mode)) 112 continue; 113 114 if ((srcfd = openat(skelfd, e->d_name, O_RDONLY)) == -1) 115 continue; 116 destfd = openat(homefd, p, O_RDWR | O_CREAT | O_EXCL, 117 st.st_mode); 118 if (destfd == -1) { 119 close(srcfd); 120 continue; 121 } 122 123 while ((sz = read(srcfd, copybuf, sizeof(copybuf))) > 0) 124 write(destfd, copybuf, sz); 125 126 close(srcfd); 127 /* 128 * Propagate special filesystem flags 129 */ 130 fchown(destfd, uid, gid); 131 fchflags(destfd, st.st_flags); 132 close(destfd); 133 } 134 closedir(d); 135 } 136