usr.sbin/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 <err.h>
  33 #include <errno.h>
  34 #include <fcntl.h>
  35 #include <stdio.h>
  36 #include <string.h>
  37 #include <stdlib.h>
  38 #include <unistd.h>
  39 #include <sys/types.h>
  40 #include <sys/stat.h>
  41 #include <sys/param.h>
  42 #include <dirent.h>
  43
  44 #include "pw.h"
  45 #include "pwupd.h"
  46
  47 void
  48 copymkdir(char const * dir, char const * skel, mode_t mode, uid_t uid, gid_t gid)
  49 {
  50         char            src[MAXPATHLEN];
  51         char            dst[MAXPATHLEN];
  52         char            lnk[MAXPATHLEN];
  53         int             len;
  54
  55         if (mkdir(dir, mode) != 0 && errno != EEXIST) {
  56                 warn("mkdir(%s)", dir);
  57         } else {
  58                 int             infd, outfd;
  59                 struct stat     st;
  60
  61                 static char     counter = 0;
  62                 static char    *copybuf = NULL;
  63
  64                 ++counter;
  65                 chown(dir, uid, gid);
  66                 if (skel != NULL && *skel != '\0') {
  67                         DIR            *d = opendir(skel);
  68
  69                         if (d != NULL) {
  70                                 struct dirent  *e;
  71
  72                                 while ((e = readdir(d)) != NULL) {
  73                                         char           *p = e->d_name;
  74
  75                                         if (snprintf(src, sizeof(src), "%s/%s", skel, p) >= (int)sizeof(src))
  76                                                 warn("warning: pathname too long '%s/%s' (skel not copied)", skel, p);
  77                                         else if (lstat(src, &st) == 0) {
  78                                                 if (strncmp(p, "dot.", 4) == 0) /* Conversion */
  79                                                         p += 3;
  80                                                 if (snprintf(dst, sizeof(dst), "%s/%s", dir, p) >= (int)sizeof(dst))
  81                                                         warn("warning: path too long '%s/%s' (skel file skipped)", dir, p);
  82                                                 else {
  83                                                     if (S_ISDIR(st.st_mode)) {  /* Recurse for this */
  84                                                         if (strcmp(e->d_name, ".") != 0 && strcmp(e->d_name, "..") != 0)
  85                                                                 copymkdir(dst, src, st.st_mode & _DEF_DIRMODE, uid, gid);
  86                                                                 chflags(dst, st.st_flags);      /* propagate flags */
  87                                                     } else if (S_ISLNK(st.st_mode) && (len = readlink(src, lnk, sizeof(lnk) - 1)) != -1) {
  88                                                         lnk[len] = '\0';
  89                                                         symlink(lnk, dst);
  90                                                         lchown(dst, uid, gid);
  91                                                         /*
  92                                                          * Note: don't propagate special attributes
  93                                                          * but do propagate file flags
  94                                                          */
  95                                                     } else if (S_ISREG(st.st_mode) && (outfd = open(dst, O_RDWR | O_CREAT | O_EXCL, st.st_mode)) != -1) {
  96                                                         if ((infd = open(src, O_RDONLY)) == -1) {
  97                                                                 close(outfd);
  98                                                                 remove(dst);
  99                                                         } else {
 100                                                                 int             b;
 101
 102                                                                 /*
 103                                                                  * Allocate our copy buffer if we need to
 104                                                                  */
 105                                                                 if (copybuf == NULL)
 106                                                                         copybuf = malloc(4096);
 107                                                                 while ((b = read(infd, copybuf, 4096)) > 0)
 108                                                                         write(outfd, copybuf, b);
 109                                                                 close(infd);
 110                                                                 /*
 111                                                                  * Propagate special filesystem flags
 112                                                                  */
 113                                                                 fchown(outfd, uid, gid);
 114                                                                 fchflags(outfd, st.st_flags);
 115                                                                 close(outfd);
 116                                                                 chown(dst, uid, gid);
 117                                                         }
 118                                                     }
 119                                                 }
 120                                         }
 121                                 }
 122                                 closedir(d);
 123                         }
 124                 }
 125                 if (--counter == 0 && copybuf != NULL) {
 126                         free(copybuf);
 127                         copybuf = NULL;
 128                 }
 129         }
 130 }
 131