usr.sbin/dev_mkdb/dev_mkdb.c

   1 /*-
   2  * Copyright (c) 1990, 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) 1990, 1993 The Regents of the University of California.  All rights reserved.
  30  * @(#)dev_mkdb.c       8.1 (Berkeley) 6/6/93
  31  * $FreeBSD: src/usr.sbin/dev_mkdb/dev_mkdb.c,v 1.4.2.1 2001/11/25 18:34:09 iedowse Exp $
  32  * $DragonFly: src/usr.sbin/dev_mkdb/dev_mkdb.c,v 1.6 2005/08/08 16:49:48 joerg Exp $
  33  */
  34
  35 #include <sys/param.h>
  36 #include <sys/stat.h>
  37
  38 #include <db.h>
  39 #include <dirent.h>
  40 #include <err.h>
  41 #include <fcntl.h>
  42 #include <kvm.h>
  43 #include <limits.h>
  44 #include <nlist.h>
  45 #include <paths.h>
  46 #include <stdio.h>
  47 #include <stdlib.h>
  48 #include <string.h>
  49 #include <unistd.h>
  50
  51 static void     usage(void);
  52
  53 int
  54 main(int argc, char **argv)
  55 {
  56         DIR *dirp;
  57         struct dirent *dp;
  58         struct stat sb;
  59         struct {
  60                 mode_t type;
  61                 dev_t dev;
  62         } bkey;
  63         DB *db;
  64         DBT data, key;
  65         int ch, fflag;
  66         u_char buf[NAME_MAX + 1];
  67         char dbtmp[NAME_MAX + 1], dbname[NAME_MAX + 1];
  68         const char *dirname;
  69
  70         fflag = 0;
  71         while ((ch = getopt(argc, argv, "f:")) != -1)
  72                 switch((char)ch) {
  73                 case 'f':
  74                         strlcpy(dbname, optarg, sizeof(dbname));
  75                         fflag = 1;
  76                         break;
  77                 case '?':
  78                 default:
  79                         usage();
  80                 }
  81         argc -= optind;
  82         argv += optind;
  83
  84         if (argc > 1)
  85                 usage();
  86         if (argc == 1)
  87                 dirname = argv[0];
  88         else
  89                 dirname = _PATH_DEV;
  90
  91         if (!fflag) {
  92                 snprintf(dbname, sizeof(dbtmp), "%sdev.db", _PATH_VARRUN);
  93                 snprintf(dbtmp, sizeof(dbtmp), "%sdev.tmp", _PATH_VARRUN);
  94         } else
  95                 snprintf(dbtmp, sizeof(dbtmp), "%s.tmp", dbname);
  96
  97         if (chdir(dirname))
  98                 err(1, "%s", dirname);
  99
 100         dirp = opendir(".");
 101
 102         db = dbopen(dbtmp, O_CREAT|O_EXLOCK|O_RDWR|O_TRUNC,
 103             S_IRUSR|S_IWUSR|S_IRGRP|S_IROTH, DB_HASH, NULL);
 104         if (db == NULL)
 105                 err(1, "%s", dbtmp);
 106
 107         /*
 108          * Keys are a mode_t followed by a dev_t.  The former is the type of
 109          * the file (mode & S_IFMT), the latter is the st_rdev field.  Note
 110          * that the structure may contain padding, so we have to clear it
 111          * out here.
 112          */
 113         bzero(&bkey, sizeof(bkey));
 114         key.data = &bkey;
 115         key.size = sizeof(bkey);
 116         data.data = buf;
 117         while ((dp = readdir(dirp))) {
 118                 if (lstat(dp->d_name, &sb)) {
 119                         warn("%s", dp->d_name);
 120                         continue;
 121                 }
 122
 123                 /* Create the key. */
 124                 if (S_ISCHR(sb.st_mode))
 125                         bkey.type = S_IFCHR;
 126                 else if (S_ISBLK(sb.st_mode))
 127                         bkey.type = S_IFBLK;
 128                 else
 129                         continue;
 130                 bkey.dev = sb.st_rdev;
 131
 132                 /*
 133                  * Create the data; nul terminate the name so caller doesn't
 134                  * have to.
 135                  */
 136                 data.size = strlcpy(buf, dp->d_name, sizeof(buf)) + 1;
 137                 if (data.size > sizeof(buf))
 138                         err(1, "file name too long");
 139                 if ((db->put)(db, &key, &data, 0))
 140                         err(1, "dbput %s", dbtmp);
 141         }
 142         (db->close)(db);
 143         if (rename(dbtmp, dbname))
 144                 err(1, "rename %s to %s", dbtmp, dbname);
 145         exit(0);
 146 }
 147
 148 static void
 149 usage(void)
 150 {
 151         fprintf(stderr, "usage: dev_mkdb [-f file] [directory]\n");
 152         exit(1);
 153 }