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 && errno != EEXIST) { 53 warn("mkdir(%s)", dir); 54 return; 55 } 56 fchownat(rootfd, dir, uid, gid, AT_SYMLINK_NOFOLLOW); 57 if (flags > 0) 58 chflagsat(rootfd, dir, flags, AT_SYMLINK_NOFOLLOW); 59 60 if (skelfd == -1) 61 return; 62 63 homefd = openat(rootfd, dir, O_DIRECTORY); 64 if ((d = fdopendir(skelfd)) == NULL) { 65 close(skelfd); 66 close(homefd); 67 return; 68 } 69 70 while ((e = readdir(d)) != NULL) { 71 if (strcmp(e->d_name, ".") == 0 || strcmp(e->d_name, "..") == 0) 72 continue; 73 74 p = e->d_name; 75 if (fstatat(skelfd, p, &st, AT_SYMLINK_NOFOLLOW) == -1) 76 continue; 77 78 if (strncmp(p, "dot.", 4) == 0) /* Conversion */ 79 p += 3; 80 81 if (S_ISDIR(st.st_mode)) { 82 copymkdir(homefd, p, openat(skelfd, e->d_name, O_DIRECTORY), 83 st.st_mode & _DEF_DIRMODE, uid, gid, st.st_flags); 84 continue; 85 } 86 87 if (S_ISLNK(st.st_mode) && 88 (len = readlinkat(skelfd, e->d_name, lnk, sizeof(lnk) -1)) 89 != -1) { 90 lnk[len] = '\0'; 91 symlinkat(lnk, homefd, p); 92 fchownat(homefd, p, uid, gid, AT_SYMLINK_NOFOLLOW); 93 continue; 94 } 95 96 if (!S_ISREG(st.st_mode)) 97 continue; 98 99 if ((srcfd = openat(skelfd, e->d_name, O_RDONLY)) == -1) 100 continue; 101 destfd = openat(homefd, p, O_RDWR | O_CREAT | O_EXCL, 102 st.st_mode); 103 if (destfd == -1) { 104 close(srcfd); 105 continue; 106 } 107 108 while ((sz = read(srcfd, copybuf, sizeof(copybuf))) > 0) 109 write(destfd, copybuf, sz); 110 111 close(srcfd); 112 /* 113 * Propagate special filesystem flags 114 */ 115 fchown(destfd, uid, gid); 116 fchflags(destfd, st.st_flags); 117 close(destfd); 118 } 119 closedir(d); 120 } 121