/*      $NetBSD: dev_mkdb.c,v 1.31 2023/08/08 10:35:37 riastradh Exp $  */

/*-
* Copyright (c) 1990, 1993
*      The Regents of the University of California.  All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
*    notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
*    notice, this list of conditions and the following disclaimer in the
*    documentation and/or other materials provided with the distribution.
* 3. Neither the name of the University nor the names of its contributors
*    may be used to endorse or promote products derived from this software
*    without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/

#include <sys/cdefs.h>
__RCSID("$NetBSD: dev_mkdb.c,v 1.31 2023/08/08 10:35:37 riastradh Exp $");

#include <sys/queue.h>
#include <sys/stat.h>

#include <cdbw.h>
#include <db.h>
#include <err.h>
#include <errno.h>
#include <fcntl.h>
#include <fts.h>
#include <paths.h>
#include <search.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <util.h>

#define HASH_SIZE       65536
#define FILE_PERMISSION S_IRUSR|S_IWUSR|S_IRGRP|S_IROTH

static struct cdbw *db;
static DB *db_compat;
static const char *db_name;
static char *db_name_tmp;

static void     usage(void) __dead;

static void
cdb_open(void)
{
       db = cdbw_open();
       if (db == NULL)
               err(1, "opening cdb writer failed");
}

static void
cdb_close(void)
{
       int fd;

       fd = open(db_name_tmp, O_CREAT|O_EXCL|O_WRONLY, FILE_PERMISSION);
       if (fd == -1)
               err(1, "opening %s failed", db_name_tmp);
       if (cdbw_output(db, fd, "NetBSD6 devdb", NULL))
               err(1, "failed to write temporary database %s", db_name_tmp);
       cdbw_close(db);
       db = NULL;
       if (close(fd))
               err(1, "failed to write temporary database %s", db_name_tmp);
}

static void
cdb_add_entry(dev_t dev, mode_t type, const char *relpath)
{
       uint8_t *buf;
       size_t len;

       len = strlen(relpath) + 1;
       buf = malloc(len + 10);
       le64enc(buf, dev);
       le16enc(buf + 8, type);
       memcpy(buf + 10, relpath, len);
       cdbw_put(db, buf, 10, buf, len + 10);
       free(buf);
}

static void
compat_open(void)
{
       static HASHINFO openinfo = {
               4096,           /* bsize */
               128,            /* ffactor */
               1024,           /* nelem */
               2048 * 1024,    /* cachesize */
               NULL,           /* hash() */
               0               /* lorder */
       };

       db_compat = dbopen(db_name_tmp, O_CREAT|O_EXCL|O_EXLOCK|O_RDWR|O_TRUNC,
           FILE_PERMISSION, DB_HASH, &openinfo);

       if (db_compat == NULL)
               err(1, "failed to create temporary database %s",
                   db_name_tmp);
}

static void
compat_close(void)
{
       if ((*db_compat->close)(db_compat))
               err(1, "failed to write temporary database %s", db_name_tmp);
}

static void
compat_add_entry(dev_t dev, mode_t type, const char *relpath)
{
       /*
        * Keys are a mode_t followed by a dev_t.  The former is the type of
        * the file (mode & S_IFMT), the latter is the st_rdev field.  Note
        * that the structure may contain padding, so we have to clear it
        * out here.
        */
       struct {
               mode_t type;
               dev_t dev;
       } bkey;
       struct {
               mode_t type;
               int32_t dev;
       } obkey;
       DBT data, key;

       (void)memset(&bkey, 0, sizeof(bkey));
       key.data = &bkey;
       key.size = sizeof(bkey);
       data.data = __UNCONST(relpath);
       data.size = strlen(relpath) + 1;
       bkey.type = type;
       bkey.dev = dev;
       if ((*db_compat->put)(db_compat, &key, &data, 0))
               err(1, "failed to write temporary database %s", db_name_tmp);

       /*
        * If the device fits into the old 32bit format, add compat entry
        * for pre-NetBSD6 libc.
        */

       if ((dev_t)(int32_t)dev != dev)
               return;

       (void)memset(&obkey, 0, sizeof(obkey));
       key.data = &obkey;
       key.size = sizeof(obkey);
       data.data = __UNCONST(relpath);
       data.size = strlen(relpath) + 1;
       obkey.type = type;
       obkey.dev = (int32_t)dev;
       if ((*db_compat->put)(db_compat, &key, &data, 0))
               err(1, "failed to write temporary database %s", db_name_tmp);
}

int
main(int argc, char **argv)
{
       struct stat *st;
       FTS *ftsp;
       FTSENT *p;
       int ch;
       char *pathv[2];
       size_t dlen;
       int compat_mode;

       setprogname(argv[0]);
       compat_mode = 0;

       while ((ch = getopt(argc, argv, "co:")) != -1)
               switch (ch) {
               case 'c':
                       compat_mode = 1;
                       break;
               case 'o':
                       db_name = optarg;
                       break;
               default:
                       usage();
               }
       argc -= optind;
       argv += optind;

       if (argc > 1)
               usage();

       pathv[1] = NULL;
       if (argc == 1)
               pathv[0] = argv[0];
       else
               pathv[0] = __UNCONST(_PATH_DEV);

       ftsp = fts_open(pathv, FTS_NOCHDIR | FTS_PHYSICAL, NULL);
       if (ftsp == NULL)
               err(1, "fts_open: %s", pathv[0]);

       if (db_name == NULL) {
               if (compat_mode)
                       db_name = _PATH_DEVDB;
               else
                       db_name = _PATH_DEVCDB;
       }
       easprintf(&db_name_tmp, "%s.XXXXXXX", db_name);
       mktemp(db_name_tmp);

       if (compat_mode)
               compat_open();
       else
               cdb_open();

       while ((p = fts_read(ftsp)) != NULL) {
               if (p->fts_info != FTS_DEFAULT)
                       continue;

               st = p->fts_statp;
               if (!S_ISCHR(st->st_mode) && !S_ISBLK(st->st_mode))
                       continue;
               dlen = strlen(pathv[0]);
               while (pathv[0][dlen] == '/')
                       ++dlen;
               if (compat_mode)
                       compat_add_entry(st->st_rdev, st->st_mode & S_IFMT,
                           p->fts_path + dlen);
               else
                       cdb_add_entry(st->st_rdev, st->st_mode & S_IFMT,
                           p->fts_path + dlen);
       }
       (void)fts_close(ftsp);

       if (compat_mode)
               compat_close();
       else
               cdb_close();

       if (rename(db_name_tmp, db_name) == -1)
               err(1, "rename %s to %s", db_name_tmp, db_name);
       return 0;
}

static void
usage(void)
{

       (void)fprintf(stderr, "Usage: %s [-c] [-o database] [directory]\n",
           getprogname());
       exit(1);
}

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