bin/mkdir/mkdir.c

   1 /*
   2  * Copyright (c) 1983, 1992, 1993
   3  *      The Regents of the University of California.  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  * 3. Neither the name of the University nor the names of its contributors
  14  *    may be used to endorse or promote products derived from this software
  15  *    without specific prior written permission.
  16  *
  17  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  27  * SUCH DAMAGE.
  28  *
  29  * @(#) Copyright (c) 1983, 1992, 1993 The Regents of the University of California.  All rights reserved.
  30  * @(#)mkdir.c  8.2 (Berkeley) 1/25/94
  31  * $FreeBSD: src/bin/mkdir/mkdir.c,v 1.19.2.2 2001/08/01 04:42:37 obrien Exp $
  32  * $DragonFly: src/bin/mkdir/mkdir.c,v 1.6 2004/11/07 20:54:51 eirikn Exp $
  33  */
  34
  35 #include <sys/types.h>
  36 #include <sys/stat.h>
  37
  38 #include <err.h>
  39 #include <errno.h>
  40 #include <libgen.h>
  41 #include <stdio.h>
  42 #include <stdlib.h>
  43 #include <string.h>
  44 #include <sysexits.h>
  45 #include <unistd.h>
  46
  47 static int      build(char *, mode_t);
  48 static int      mkdir_race(const char *path, int nmode);
  49 static void     usage(void);
  50
  51 int vflag;
  52
  53 int
  54 main(int argc, char **argv)
  55 {
  56         int ch, exitval, success, pflag;
  57         void *set;
  58         mode_t omode;
  59         char *mode;
  60
  61         pflag = 0;
  62         mode = NULL;
  63         while ((ch = getopt(argc, argv, "m:pv")) != -1)
  64                 switch(ch) {
  65                 case 'm':
  66                         mode = optarg;
  67                         break;
  68                 case 'p':
  69                         pflag = 1;
  70                         break;
  71                 case 'v':
  72                         vflag = 1;
  73                         break;
  74                 default:
  75                         usage();
  76                 }
  77
  78         argc -= optind;
  79         argv += optind;
  80         if (argv[0] == NULL)
  81                 usage();
  82
  83         if (mode == NULL) {
  84                 omode = S_IRWXU | S_IRWXG | S_IRWXO;
  85         } else {
  86                 errno = 0;
  87                 if ((set = setmode(mode)) == NULL) {
  88                         if (!errno)
  89                                 errx(1, "invalid file mode: %s", mode);
  90                         else
  91                                 /* A malloc(3) error, not a invaild file mode. */
  92                                 err(1, "setmode failed");
  93                 }
  94                 omode = getmode(set, S_IRWXU | S_IRWXG | S_IRWXO);
  95                 free(set);
  96         }
  97
  98         for (exitval = 0; *argv != NULL; ++argv) {
  99                 success = 1;
 100                 if (pflag) {
 101                         if (build(*argv, omode))
 102                                 success = 0;
 103                 } else if (mkdir(*argv, omode) < 0) {
 104                         if (errno == ENOTDIR || errno == ENOENT)
 105                                 warn("%s", dirname(*argv));
 106                         else
 107                                 warn("%s", *argv);
 108                         success = 0;
 109                 } else if (vflag)
 110                         printf("%s\n", *argv);
 111
 112                 if (!success)
 113                         exitval = 1;
 114                 /*
 115                  * The mkdir() and umask() calls both honor only the low
 116                  * nine bits, so if you try to set a mode including the
 117                  * sticky, setuid, setgid bits you lose them.  Don't do
 118                  * this unless the user has specifically requested a mode,
 119                  * as chmod will (obviously) ignore the umask.
 120                  */
 121                 if (success && mode != NULL && chmod(*argv, omode) == -1) {
 122                         warn("%s", *argv);
 123                         exitval = 1;
 124                 }
 125         }
 126         exit(exitval);
 127 }
 128
 129 static int
 130 build(char *path, mode_t omode)
 131 {
 132         struct stat sb;
 133         mode_t numask, oumask;
 134         int first, last, retval;
 135         char *p;
 136
 137         p = path;
 138         oumask = 0;
 139         retval = 0;
 140         if (p[0] == '/')                /* Skip leading '/'. */
 141                 ++p;
 142         for (first = 1, last = 0; !last ; ++p) {
 143                 if (p[0] == '\0')
 144                         last = 1;
 145                 else if (p[0] != '/')
 146                         continue;
 147                 *p = '\0';
 148                 if (!last && p[1] == '\0')
 149                         last = 1;
 150                 if (first) {
 151                         /*
 152                          * POSIX 1003.2:
 153                          * For each dir operand that does not name an existing
 154                          * directory, effects equivalent to those cased by the
 155                          * following command shall occcur:
 156                          *
 157                          * mkdir -p -m $(umask -S),u+wx $(dirname dir) &&
 158                          *    mkdir [-m mode] dir
 159                          *
 160                          * We change the user's umask and then restore it,
 161                          * instead of doing chmod's.
 162                          */
 163                         oumask = umask(0);
 164                         numask = oumask & ~(S_IWUSR | S_IXUSR);
 165                         umask(numask);
 166                         first = 0;
 167                 }
 168                 if (last)
 169                         umask(oumask);
 170                 if (stat(path, &sb)) {
 171                         if (errno != ENOENT ||
 172                             mkdir_race(path, last ? omode :
 173                                   S_IRWXU | S_IRWXG | S_IRWXO) < 0) {
 174                                 warn("%s", path);
 175                                 retval = 1;
 176                                 break;
 177                         } else if (vflag)
 178                                 printf("%s\n", path);
 179                 }
 180                 else if ((sb.st_mode & S_IFMT) != S_IFDIR) {
 181                         if (last)
 182                                 errno = EEXIST;
 183                         else
 184                                 errno = ENOTDIR;
 185                         warn("%s", path);
 186                         retval = 1;
 187                         break;
 188                 }
 189                 if (!last)
 190                     *p = '/';
 191         }
 192         if (!first && !last)
 193                 umask(oumask);
 194         return (retval);
 195 }
 196
 197 int
 198 mkdir_race(const char *path, int nmode)
 199 {
 200         int res;
 201         struct stat sb;
 202
 203         res = mkdir(path, nmode);
 204         if (res < 0 && errno == EEXIST) {
 205                if (stat(path, &sb) == 0 && S_ISDIR(sb.st_mode))
 206                        return(0);
 207                res = mkdir(path, nmode);
 208         }
 209         return (res);
 210 }
 211
 212 static void
 213 usage(void)
 214 {
 215
 216         fprintf(stderr, "usage: mkdir [-pv] [-m mode] directory ...\n");
 217         exit (EX_USAGE);
 218 }