pw/cpdir.c

   1 /*-
   2  * Copyright (C) 1996
   3  *      David L. Nugent.  All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  *
  14  * THIS SOFTWARE IS PROVIDED BY DAVID L. NUGENT AND CONTRIBUTORS ``AS IS'' AND
  15  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  17  * ARE DISCLAIMED.  IN NO EVENT SHALL DAVID L. NUGENT OR CONTRIBUTORS BE LIABLE
  18  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  19  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  20  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  21  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  22  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  23  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  24  * SUCH DAMAGE.
  25  */
  26
  27 #ifndef lint
  28 static const char rcsid[] =
  29   "$FreeBSD$";
  30 #endif /* not lint */
  31
  32 #include <dirent.h>
  33 #include <err.h>
  34 #include <errno.h>
  35 #include <fcntl.h>
  36 #include <string.h>
  37 #include <unistd.h>
  38
  39 #include "pw.h"
  40
  41 void
  42 copymkdir(int rootfd, char const * dir, int skelfd, mode_t mode, uid_t uid,
  43     gid_t gid, int flags)
  44 {
  45         char            *p, lnk[MAXPATHLEN], copybuf[4096];
  46         int             len, homefd, srcfd, destfd;
  47         ssize_t         sz;
  48         struct stat     st;
  49         struct dirent  *e;
  50         DIR             *d;
  51
  52         if (*dir == '/')
  53                 dir++;
  54
  55         if (mkdirat(rootfd, dir, mode) != 0 && errno != EEXIST) {
  56                 warn("mkdir(%s)", dir);
  57                 return;
  58         }
  59         fchownat(rootfd, dir, uid, gid, AT_SYMLINK_NOFOLLOW);
  60         if (flags > 0)
  61                 chflagsat(rootfd, dir, flags, AT_SYMLINK_NOFOLLOW);
  62
  63         if (skelfd == -1)
  64                 return;
  65
  66         homefd = openat(rootfd, dir, O_DIRECTORY);
  67         if ((d = fdopendir(skelfd)) == NULL) {
  68                 close(skelfd);
  69                 close(homefd);
  70                 return;
  71         }
  72
  73         while ((e = readdir(d)) != NULL) {
  74                 if (strcmp(e->d_name, ".") == 0 || strcmp(e->d_name, "..") == 0)
  75                         continue;
  76
  77                 p = e->d_name;
  78                 if (fstatat(skelfd, p, &st, AT_SYMLINK_NOFOLLOW) == -1)
  79                         continue;
  80
  81                 if (strncmp(p, "dot.", 4) == 0) /* Conversion */
  82                         p += 3;
  83
  84                 if (S_ISDIR(st.st_mode)) {
  85                         copymkdir(homefd, p, openat(skelfd, e->d_name, O_DIRECTORY),
  86                             st.st_mode & _DEF_DIRMODE, uid, gid, st.st_flags);
  87                         continue;
  88                 }
  89
  90                 if (S_ISLNK(st.st_mode) &&
  91                     (len = readlinkat(skelfd, e->d_name, lnk, sizeof(lnk) -1))
  92                     != -1) {
  93                         lnk[len] = '\0';
  94                         symlinkat(lnk, homefd, p);
  95                         fchownat(homefd, p, uid, gid, AT_SYMLINK_NOFOLLOW);
  96                         continue;
  97                 }
  98
  99                 if (!S_ISREG(st.st_mode))
 100                         continue;
 101
 102                 if ((srcfd = openat(skelfd, e->d_name, O_RDONLY)) == -1)
 103                         continue;
 104                 destfd = openat(homefd, p, O_RDWR | O_CREAT | O_EXCL,
 105                     st.st_mode);
 106                 if (destfd == -1) {
 107                         close(srcfd);
 108                         continue;
 109                 }
 110
 111                 while ((sz = read(srcfd, copybuf, sizeof(copybuf))) > 0)
 112                         write(destfd, copybuf, sz);
 113
 114                 close(srcfd);
 115                 /*
 116                  * Propagate special filesystem flags
 117                  */
 118                 fchown(destfd, uid, gid);
 119                 fchflags(destfd, st.st_flags);
 120                 close(destfd);
 121         }
 122         closedir(d);
 123 }