/*      $NetBSD: dev_mkdb.c,v 1.32 2026/01/02 16:31:00 nia 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 1.32 2026/01/02 16:31:00 nia Exp $");

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

#include <cdbw.h>
#include <db.h>
#include <err.h>
#include <errno.h>
#include <endian.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);
}