/*      $NetBSD: output_db.c,v 1.2 2017/01/10 21:04:58 christos Exp $   */

/*-
 * Copyright (c) 1999 The NetBSD Foundation, Inc.
 * All rights reserved.
 *
 * This code is derived from software contributed to The NetBSD Foundation
 * by Luke Mewburn and Christos Zoulas.
 *
 * 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.
 *
 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. 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 FOUNDATION 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>
#ifndef lint
__RCSID("$NetBSD: output_db.c,v 1.2 2017/01/10 21:04:58 christos Exp $");
#endif /* not lint */

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

#include <assert.h>
#include <db.h>
#include <err.h>
#include <fcntl.h>
#include <netdb.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <util.h>
#include <ctype.h>
#include <errno.h>
#include <stringlist.h>

#include "extern.h"

static DB *db;

static const HASHINFO hinfo = {
        .bsize = 256,
        .ffactor = 4,
        .nelem = 32768,
        .cachesize = 1024,
        .hash = NULL,
        .lorder = 0
};

static void     store(DBT *, DBT *, int);
static void     killproto(DBT *);
static const char *mkaliases(StringList *, char *, size_t);

int
db_open(const char *tname)
{
        db = dbopen(tname, O_RDWR | O_CREAT | O_EXCL,
            (S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH), DB_HASH, &hinfo);

        return db != NULL ? 0 : -1;
}

int
db_close(void)
{
        int rv;

        rv = (db->close)(db);
        db = NULL;

        return rv;
}

void
db_add(StringList *sl, size_t port, const char *proto, size_t *cnt,
    int warndup)
{
        size_t i;
        char     keyb[BUFSIZ], datab[BUFSIZ], abuf[BUFSIZ];
        DBT      data, key;
        key.data = keyb;
        data.data = datab;

        /* key `indirect key', data `full line' */
        data.size = snprintf(datab, sizeof(datab), "%zu", (*cnt)++) + 1;
        key.size = snprintf(keyb, sizeof(keyb), "%s %zu/%s %s",
            sl->sl_str[0], port, proto, mkaliases(sl, abuf, sizeof(abuf))) + 1;
        store(&data, &key, warndup);

        /* key `\377port/proto', data = `indirect key' */
        key.size = snprintf(keyb, sizeof(keyb), "\377%zu/%s",
            port, proto) + 1;
        store(&key, &data, warndup);

        /* key `\377port', data = `indirect key' */
        killproto(&key);
        store(&key, &data, warndup);

        /* add references for service and all aliases */
        for (i = 0; i < sl->sl_cur; i++) {
                /* key `\376service/proto', data = `indirect key' */
                key.size = snprintf(keyb, sizeof(keyb), "\376%s/%s",
                    sl->sl_str[i], proto) + 1;
                store(&key, &data, warndup);

                /* key `\376service', data = `indirect key' */
                killproto(&key);
                store(&key, &data, warndup);
        }
        sl_free(sl, 1);
}

static void
killproto(DBT *key)
{
        char *p, *d = key->data;

        if ((p = strchr(d, '/')) == NULL)
                abort();
        *p++ = '\0';
        key->size = p - d;
}

static void
store(DBT *key, DBT *data, int warndup)
{
#ifdef DEBUG
        int k = key->size - 1;
        int d = data->size - 1;
        (void)printf("store [%*.*s] [%*.*s]\n",
                k, k, (char *)key->data + 1,
                d, d, (char *)data->data + 1);
#endif
        switch ((db->put)(db, key, data, R_NOOVERWRITE)) {
        case 0:
                break;
        case 1:
                if (warndup)
                        warnx("duplicate service `%s'",
                            &((char *)key->data)[1]);
                break;
        case -1:
                err(1, "put");
                break;
        default:
                abort();
                break;
        }
}

static const char *
mkaliases(StringList *sl, char *buf, size_t len)
{
        size_t nc, i, pos;

        buf[0] = 0;
        for (i = 1, pos = 0; i < sl->sl_cur; i++) {
                nc = strlcpy(buf + pos, sl->sl_str[i], len);
                if (nc >= len)
                        goto out;
                pos += nc;
                len -= nc;
                nc = strlcpy(buf + pos, " ", len);
                if (nc >= len)
                        goto out;
                pos += nc;
                len -= nc;
        }
        return buf;
out:
        warn("aliases for `%s' truncated", sl->sl_str[0]);
        return buf;
}