pw/cpdir.c

   1 /*-
   2  * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
   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 #ifndef lint
  30 static const char rcsid[] =
  31   "$FreeBSD$";
  32 #endif /* not lint */
  33
  34 #include <dirent.h>
  35 #include <err.h>
  36 #include <errno.h>
  37 #include <fcntl.h>
  38 #include <string.h>
  39 #include <unistd.h>
  40
  41 #include "pw.h"
  42
  43 void
  44 copymkdir(int rootfd, char const * dir, int skelfd, mode_t mode, uid_t uid,
  45     gid_t gid, int flags)
  46 {
  47         char            *p, lnk[MAXPATHLEN], copybuf[4096];
  48         int             len, homefd, srcfd, destfd;
  49         ssize_t         sz;
  50         struct stat     st;
  51         struct dirent  *e;
  52         DIR             *d;
  53
  54         if (*dir == '/')
  55                 dir++;
  56
  57         if (mkdirat(rootfd, dir, mode) != 0 && errno != EEXIST) {
  58                 warn("mkdir(%s)", dir);
  59                 return;
  60         }
  61         fchownat(rootfd, dir, uid, gid, AT_SYMLINK_NOFOLLOW);
  62         if (flags > 0)
  63                 chflagsat(rootfd, dir, flags, AT_SYMLINK_NOFOLLOW);
  64
  65         if (skelfd == -1)
  66                 return;
  67
  68         homefd = openat(rootfd, dir, O_DIRECTORY);
  69         if ((d = fdopendir(skelfd)) == NULL) {
  70                 close(skelfd);
  71                 close(homefd);
  72                 return;
  73         }
  74
  75         while ((e = readdir(d)) != NULL) {
  76                 if (strcmp(e->d_name, ".") == 0 || strcmp(e->d_name, "..") == 0)
  77                         continue;
  78
  79                 p = e->d_name;
  80                 if (fstatat(skelfd, p, &st, AT_SYMLINK_NOFOLLOW) == -1)
  81                         continue;
  82
  83                 if (strncmp(p, "dot.", 4) == 0) /* Conversion */
  84                         p += 3;
  85
  86                 if (S_ISDIR(st.st_mode)) {
  87                         copymkdir(homefd, p, openat(skelfd, e->d_name, O_DIRECTORY),
  88                             st.st_mode & _DEF_DIRMODE, uid, gid, st.st_flags);
  89                         continue;
  90                 }
  91
  92                 if (S_ISLNK(st.st_mode) &&
  93                     (len = readlinkat(skelfd, e->d_name, lnk, sizeof(lnk) -1))
  94                     != -1) {
  95                         lnk[len] = '\0';
  96                         symlinkat(lnk, homefd, p);
  97                         fchownat(homefd, p, uid, gid, AT_SYMLINK_NOFOLLOW);
  98                         continue;
  99                 }
 100
 101                 if (!S_ISREG(st.st_mode))
 102                         continue;
 103
 104                 if ((srcfd = openat(skelfd, e->d_name, O_RDONLY)) == -1)
 105                         continue;
 106                 destfd = openat(homefd, p, O_RDWR | O_CREAT | O_EXCL,
 107                     st.st_mode);
 108                 if (destfd == -1) {
 109                         close(srcfd);
 110                         continue;
 111                 }
 112
 113                 while ((sz = read(srcfd, copybuf, sizeof(copybuf))) > 0)
 114                         write(destfd, copybuf, sz);
 115
 116                 close(srcfd);
 117                 /*
 118                  * Propagate special filesystem flags
 119                  */
 120                 fchown(destfd, uid, gid);
 121                 fchflags(destfd, st.st_flags);
 122                 close(destfd);
 123         }
 124         closedir(d);
 125 }