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  * $FreeBSD: src/usr.sbin/pw/cpdir.c,v 1.11 2012/02/14 10:17:03 kevlo Exp $
  27  */
  28
  29 #include <err.h>
  30 #include <errno.h>
  31 #include <fcntl.h>
  32 #include <stdio.h>
  33 #include <string.h>
  34 #include <stdlib.h>
  35 #include <unistd.h>
  36 #include <sys/types.h>
  37 #include <sys/stat.h>
  38 #include <sys/param.h>
  39 #include <dirent.h>
  40
  41 #include "pw.h"
  42 #include "pwupd.h"
  43
  44 void
  45 copymkdir(char const * dir, char const * skel, mode_t mode, uid_t uid, gid_t gid)
  46 {
  47         char            src[MAXPATHLEN];
  48         char            dst[MAXPATHLEN];
  49         char            lnk[MAXPATHLEN];
  50         int             len;
  51
  52         if (mkdir(dir, mode) != 0 && errno != EEXIST) {
  53                 warn("mkdir(%s)", dir);
  54         } else {
  55                 int             infd, outfd;
  56                 struct stat     st;
  57
  58                 static char     counter = 0;
  59                 static char    *copybuf = NULL;
  60
  61                 ++counter;
  62                 chown(dir, uid, gid);
  63                 if (skel != NULL && *skel != '\0') {
  64                         DIR            *d = opendir(skel);
  65
  66                         if (d != NULL) {
  67                                 struct dirent  *e;
  68
  69                                 while ((e = readdir(d)) != NULL) {
  70                                         char           *p = e->d_name;
  71
  72                                         if (snprintf(src, sizeof(src), "%s/%s", skel, p) >= (int)sizeof(src))
  73                                                 warn("warning: pathname too long '%s/%s' (skel not copied)", skel, p);
  74                                         else if (lstat(src, &st) == 0) {
  75                                                 if (strncmp(p, "dot.", 4) == 0) /* Conversion */
  76                                                         p += 3;
  77                                                 if (snprintf(dst, sizeof(dst), "%s/%s", dir, p) >= (int)sizeof(dst))
  78                                                         warn("warning: path too long '%s/%s' (skel file skipped)", dir, p);
  79                                                 else {
  80                                                     if (S_ISDIR(st.st_mode)) {  /* Recurse for this */
  81                                                         if (strcmp(e->d_name, ".") != 0 && strcmp(e->d_name, "..") != 0) {
  82                                                                 copymkdir(dst, src, st.st_mode & _DEF_DIRMODE, uid, gid);
  83                                                                 chflags(dst, st.st_flags);      /* propagate flags */
  84                                                         }
  85                                                     } else if (S_ISLNK(st.st_mode) && (len = readlink(src, lnk, sizeof(lnk) - 1)) != -1) {
  86                                                         lnk[len] = '\0';
  87                                                         symlink(lnk, dst);
  88                                                         lchown(dst, uid, gid);
  89                                                         /*
  90                                                          * Note: don't propagate special attributes
  91                                                          * but do propagate file flags
  92                                                          */
  93                                                     } else if (S_ISREG(st.st_mode) && (outfd = open(dst, O_RDWR | O_CREAT | O_EXCL, st.st_mode)) != -1) {
  94                                                         if ((infd = open(src, O_RDONLY)) == -1) {
  95                                                                 close(outfd);
  96                                                                 remove(dst);
  97                                                         } else {
  98                                                                 int             b;
  99
 100                                                                 /*
 101                                                                  * Allocate our copy buffer if we need to
 102                                                                  */
 103                                                                 if (copybuf == NULL)
 104                                                                         copybuf = malloc(4096);
 105                                                                 while ((b = read(infd, copybuf, 4096)) > 0)
 106                                                                         write(outfd, copybuf, b);
 107                                                                 close(infd);
 108                                                                 /*
 109                                                                  * Propagate special filesystem flags
 110                                                                  */
 111                                                                 fchown(outfd, uid, gid);
 112                                                                 fchflags(outfd, st.st_flags);
 113                                                                 close(outfd);
 114                                                                 chown(dst, uid, gid);
 115                                                         }
 116                                                     }
 117                                                 }
 118                                         }
 119                                 }
 120                                 closedir(d);
 121                         }
 122                 }
 123                 if (--counter == 0 && copybuf != NULL) {
 124                         free(copybuf);
 125                         copybuf = NULL;
 126                 }
 127         }
 128 }
 129