usr.sbin/dev_mkdb/dev_mkdb.c

   1 /*      $NetBSD: dev_mkdb.c,v 1.29 2012/06/03 21:42:47 joerg Exp $      */
   2
   3 /*-
   4  * Copyright (c) 1990, 1993
   5  *      The Regents of the University of California.  All rights reserved.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions and the following disclaimer.
  12  * 2. Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in the
  14  *    documentation and/or other materials provided with the distribution.
  15  * 3. Neither the name of the University nor the names of its contributors
  16  *    may be used to endorse or promote products derived from this software
  17  *    without specific prior written permission.
  18  *
  19  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  20  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  21  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  22  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  23  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  24  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  25  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  26  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  27  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  29  * SUCH DAMAGE.
  30  */
  31
  32 #include <sys/cdefs.h>
  33 __RCSID("$NetBSD: dev_mkdb.c,v 1.29 2012/06/03 21:42:47 joerg Exp $");
  34
  35 #include <sys/queue.h>
  36 #include <sys/stat.h>
  37
  38 #include <cdbw.h>
  39 #include <db.h>
  40 #include <err.h>
  41 #include <errno.h>
  42 #include <fcntl.h>
  43 #include <fts.h>
  44 #include <paths.h>
  45 #include <search.h>
  46 #include <stdint.h>
  47 #include <stdio.h>
  48 #include <stdlib.h>
  49 #include <string.h>
  50 #include <unistd.h>
  51 #include <util.h>
  52
  53 #define HASH_SIZE       65536
  54 #define FILE_PERMISSION S_IRUSR|S_IWUSR|S_IRGRP|S_IROTH
  55
  56 static struct cdbw *db;
  57 static DB *db_compat;
  58 static const char *db_name;
  59 static char *db_name_tmp;
  60
  61 static void     usage(void) __dead;
  62
  63 static void
  64 cdb_open(void)
  65 {
  66         db = cdbw_open();
  67         if (db == NULL)
  68                 err(1, "opening cdb writer failed");
  69 }
  70
  71 static void
  72 cdb_close(void)
  73 {
  74         int fd;
  75
  76         fd = open(db_name_tmp, O_CREAT|O_EXCL|O_WRONLY, FILE_PERMISSION);
  77         if (fd == -1)
  78                 err(1, "opening %s failed", db_name_tmp);
  79         if (cdbw_output(db, fd, "NetBSD6 devdb", NULL))
  80                 err(1, "failed to write temporary database %s", db_name_tmp);
  81         cdbw_close(db);
  82         db = NULL;
  83         if (close(fd))
  84                 err(1, "failed to write temporary database %s", db_name_tmp);
  85 }
  86
  87 static void
  88 cdb_add_entry(dev_t dev, mode_t type, const char *relpath)
  89 {
  90         uint8_t *buf;
  91         size_t len;
  92
  93         len = strlen(relpath) + 1;
  94         buf = malloc(len + 10);
  95         le64enc(buf, dev);
  96         le16enc(buf + 8, type);
  97         memcpy(buf + 10, relpath, len);
  98         cdbw_put(db, buf, 10, buf, len + 10);
  99         free(buf);
 100 }
 101
 102 static void
 103 compat_open(void)
 104 {
 105         static HASHINFO openinfo = {
 106                 4096,           /* bsize */
 107                 128,            /* ffactor */
 108                 1024,           /* nelem */
 109                 2048 * 1024,    /* cachesize */
 110                 NULL,           /* hash() */
 111                 0               /* lorder */
 112         };
 113
 114         db_compat = dbopen(db_name_tmp, O_CREAT|O_EXCL|O_EXLOCK|O_RDWR|O_TRUNC,
 115             FILE_PERMISSION, DB_HASH, &openinfo);
 116
 117         if (db_compat == NULL)
 118                 err(1, "failed to create temporary database %s",
 119                     db_name_tmp);
 120 }
 121
 122 static void
 123 compat_close(void)
 124 {
 125         if ((*db_compat->close)(db_compat))
 126                 err(1, "failed to write temporary database %s", db_name_tmp);
 127 }
 128
 129 static void
 130 compat_add_entry(dev_t dev, mode_t type, const char *relpath)
 131 {
 132         /*
 133          * Keys are a mode_t followed by a dev_t.  The former is the type of
 134          * the file (mode & S_IFMT), the latter is the st_rdev field.  Note
 135          * that the structure may contain padding, so we have to clear it
 136          * out here.
 137          */
 138         struct {
 139                 mode_t type;
 140                 dev_t dev;
 141         } bkey;
 142         struct {
 143                 mode_t type;
 144                 int32_t dev;
 145         } obkey;
 146         DBT data, key;
 147
 148         (void)memset(&bkey, 0, sizeof(bkey));
 149         key.data = &bkey;
 150         key.size = sizeof(bkey);
 151         data.data = __UNCONST(relpath);
 152         data.size = strlen(relpath) + 1;
 153         bkey.type = type;
 154         bkey.dev = dev;
 155         if ((*db_compat->put)(db_compat, &key, &data, 0))
 156                 err(1, "failed to write temporary database %s", db_name_tmp);
 157
 158         /*
 159          * If the device fits into the old 32bit format, add compat entry
 160          * for pre-NetBSD6 libc.
 161          */
 162
 163         if ((dev_t)(int32_t)dev != dev)
 164                 return;
 165
 166         (void)memset(&obkey, 0, sizeof(obkey));
 167         key.data = &obkey;
 168         key.size = sizeof(obkey);
 169         data.data = __UNCONST(relpath);
 170         data.size = strlen(relpath) + 1;
 171         obkey.type = type;
 172         obkey.dev = (int32_t)dev;
 173         if ((*db_compat->put)(db_compat, &key, &data, 0))
 174                 err(1, "failed to write temporary database %s", db_name_tmp);
 175 }
 176
 177 int
 178 main(int argc, char **argv)
 179 {
 180         struct stat *st;
 181         FTS *ftsp;
 182         FTSENT *p;
 183         int ch;
 184         char *pathv[2];
 185         size_t dlen;
 186         int compat_mode;
 187
 188         setprogname(argv[0]);
 189         compat_mode = 0;
 190
 191         while ((ch = getopt(argc, argv, "co:")) != -1)
 192                 switch (ch) {
 193                 case 'c':
 194                         compat_mode = 1;
 195                         break;
 196                 case 'o':
 197                         db_name = optarg;
 198                         break;
 199                 default:
 200                         usage();
 201                 }
 202         argc -= optind;
 203         argv += optind;
 204
 205         if (argc > 1)
 206                 usage();
 207
 208         pathv[1] = NULL;
 209         if (argc == 1)
 210                 pathv[0] = argv[0];
 211         else
 212                 pathv[0] = __UNCONST(_PATH_DEV);
 213
 214         ftsp = fts_open(pathv, FTS_NOCHDIR | FTS_PHYSICAL, NULL);
 215         if (ftsp == NULL)
 216                 err(1, "fts_open: %s", pathv[0]);
 217
 218         if (db_name == NULL) {
 219                 if (compat_mode)
 220                         db_name = _PATH_DEVDB;
 221                 else
 222                         db_name = _PATH_DEVCDB;
 223         }
 224         easprintf(&db_name_tmp, "%s.XXXXXXX", db_name);
 225         mktemp(db_name_tmp);
 226
 227         if (compat_mode)
 228                 compat_open();
 229         else
 230                 cdb_open();
 231
 232         while ((p = fts_read(ftsp)) != NULL) {
 233                 if (p->fts_info != FTS_DEFAULT)
 234                         continue;
 235
 236                 st = p->fts_statp;
 237                 if (!S_ISCHR(st->st_mode) && !S_ISBLK(st->st_mode))
 238                         continue;
 239                 dlen = strlen(pathv[0]);
 240                 while (pathv[0][dlen] == '/')
 241                         ++dlen;
 242                 if (compat_mode)
 243                         compat_add_entry(st->st_rdev, st->st_mode & S_IFMT,
 244                             p->fts_path + dlen);
 245                 else
 246                         cdb_add_entry(st->st_rdev, st->st_mode & S_IFMT,
 247                             p->fts_path + dlen);
 248         }
 249         (void)fts_close(ftsp);
 250
 251         if (compat_mode)
 252                 compat_close();
 253         else
 254                 cdb_close();
 255
 256         if (rename(db_name_tmp, db_name) == -1)
 257                 err(1, "rename %s to %s", db_name_tmp, db_name);
 258         return 0;
 259 }
 260
 261 static void
 262 usage(void)
 263 {
 264
 265         (void)fprintf(stderr, "Usage: %s [-c] [-o database] [directory]\n",
 266             getprogname());
 267         exit(1);
 268 }