/*      $NetBSD: output_cdb.c,v 1.3 2023/08/08 10:35:21 riastradh Exp $ */

/*-
 * Copyright (c) 2010 The NetBSD Foundation, Inc.
 * All rights reserved.
 *
 * This code is derived from software contributed to The NetBSD Foundation
 * by Joerg Sonnenberger.
 *
 * 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/endian.h>
#include <cdbw.h>
#include <err.h>
#include <errno.h>
#include <fcntl.h>
#include <stdlib.h>
#include <string.h>
#include <stringlist.h>
#include <unistd.h>

#include "extern.h"

static struct cdbw *cdbw;
static int cdbw_fd = -1;

int
cdb_open(const char *tname)
{

        if ((cdbw = cdbw_open()) == NULL)
                return -1;

        if ((cdbw_fd = open(tname, O_WRONLY | O_CREAT | O_TRUNC, 0666)) == -1) {
                cdbw_close(cdbw);
                cdbw = NULL;
                return -1;
        }
        return 0;
}

void
cdb_add(StringList *sl, size_t port, const char *proto, size_t *cnt,
    int warndup)
{
        uint8_t key[255 * 2 + 2];
        uint8_t *data, *data_iter;
        size_t len, protolen, datalen, keylen;
        uint32_t idx;
        size_t i;

        protolen = strlen(proto);
        if (protolen == 0 || protolen > 255)
                errx(1, "Invalid protocol ``%s'', entry skipped", proto);

        datalen = 4 + protolen;
        for (i = 0; i < sl->sl_cur; ++i) {
                len = strlen(sl->sl_str[i]);
                if (len == 0 || len > 255)
                        errx(1, "Service alias ``%s'' invalid", sl->sl_str[i]);
                datalen += len + 2;
        }

        data = malloc(datalen);
        if (data == NULL)
                err(1, "malloc failed");
        be16enc(data, port);
        data[2] = protolen;
        data_iter = data + 3;
        memcpy(data_iter, proto, protolen + 1);
        data_iter += protolen + 1;
        for (i = 0; i < sl->sl_cur; ++i) {
                len = strlen(sl->sl_str[i]);
                *data_iter++ = len;
                memcpy(data_iter, sl->sl_str[i], len + 1);
                data_iter += len + 1;
        }

        if (cdbw_put_data(cdbw, data, datalen, &idx))
                err(1, "cdbw_put_data failed");

        free(data);

        key[0] = 0;
        key[1] = protolen;
        be16enc(key + 2, port);
        memcpy(key + 4, proto, protolen);
        keylen = 4 + protolen;
        if (cdbw_put_key(cdbw, key, keylen, idx) && warndup)
                warnx("duplicate service: `%zu/%s'", port, proto);

        key[1] = 0;
        keylen = 4;
        if (cdbw_put_key(cdbw, key, keylen, idx) && warndup)
                warnx("duplicate service: `%zu'", port);

        /* add references for service and all aliases */
        for (i = 0; i < sl->sl_cur; i++) {
                len = strlen(sl->sl_str[i]);
                key[0] = len;
                key[1] = protolen;
                memcpy(key + 2, sl->sl_str[i], len);
                memcpy(key + 2 + len, proto, protolen);
                keylen = 2 + len + protolen;
                if (cdbw_put_key(cdbw, key, keylen, idx) && warndup)
                        warnx("duplicate service: `%s/%s'", sl->sl_str[i], proto);

                key[1] = 0;
                keylen = 2 + len;
                if (cdbw_put_key(cdbw, key, keylen, idx) && warndup)
                        warnx("duplicate service: `%s'", sl->sl_str[i]);
        }

        sl_free(sl, 1);
}

int
cdb_close(void)
{
        int rv, serrno;

        rv = 0;
        serrno = errno;

        if (cdbw_output(cdbw, cdbw_fd, "services(5)", NULL)) {
                rv = -1;
                serrno = errno;
        }

        cdbw_close(cdbw);
        cdbw = NULL;

        if (close(cdbw_fd)) {
                if (rv == 0)
                        serrno = errno;
                rv = -1;
        }
        cdbw_fd = -1;

        errno = serrno;
        return rv;
}