/*      $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;
}