/*      $NetBSD: dnssec.c,v 1.6 2025/03/07 15:55:28 christos Exp $      */

/*      $KAME: dnssec.c,v 1.2 2001/08/05 18:46:07 itojun Exp $  */

/*
 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
 * 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 project 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 PROJECT 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 PROJECT 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 "config.h"

#include <sys/types.h>
#include <sys/param.h>
#include <stdlib.h>
#include <string.h>

#include "var.h"
#include "vmbuf.h"
#include "misc.h"
#include "plog.h"
#include "debug.h"

#include "isakmp_var.h"
#include "isakmp.h"
#include "ipsec_doi.h"
#include "oakley.h"
#include "netdb_dnssec.h"
#include "strnames.h"
#include "dnssec.h"
#include "gcmalloc.h"

extern int h_errno;

vchar_t *
dnssec_getcert(vchar_t *id)
{
        vchar_t *cert = NULL;
        struct certinfo *res = NULL;
        struct ipsecdoi_id_b *id_b;
        int type;
        char *name = NULL;
        size_t namelen;
        int error;

        id_b = (struct ipsecdoi_id_b *)id->v;

        namelen = id->l - sizeof(*id_b);
        name = racoon_malloc(namelen + 1);
        if (!name) {
                plog(LLV_ERROR, LOCATION, NULL,
                        "failed to get buffer.\n");
                return NULL;
        }
        memcpy(name, id_b + 1, namelen);
        name[namelen] = '\0';

        switch (id_b->type) {
        case IPSECDOI_ID_FQDN:
                error = getcertsbyname(name, &res);
                if (error != 0) {
                        plog(LLV_ERROR, LOCATION, NULL,
                                "getcertsbyname(\"%s\") failed.\n", name);
                        goto err;
                }
                break;
        case IPSECDOI_ID_IPV4_ADDR:
        case IPSECDOI_ID_IPV6_ADDR:
                /* XXX should be processed to query PTR ? */
        default:
                plog(LLV_ERROR, LOCATION, NULL,
                        "inpropper ID type passed %s "
                        "though getcert method is dnssec.\n",
                        s_ipsecdoi_ident(id_b->type));
                goto err;
        }

        /* check response */
        if (res->ci_next != NULL) {
                plog(LLV_WARNING, LOCATION, NULL,
                        "not supported multiple CERT RR.\n");
        }
        switch (res->ci_type) {
        case DNSSEC_TYPE_PKIX:
                /* XXX is it enough condition to set this type ? */
                type = ISAKMP_CERT_X509SIGN;
                break;
        default:
                plog(LLV_ERROR, LOCATION, NULL,
                        "not supported CERT RR type %d.\n", res->ci_type);
                goto err;
        }

        /* create cert holder */
        cert = vmalloc(res->ci_certlen + 1);
        if (cert == NULL) {
                plog(LLV_ERROR, LOCATION, NULL,
                        "failed to get cert buffer.\n");
                goto err;
        }
        cert->v[0] = type;
        memcpy(&cert->v[1], res->ci_cert, res->ci_certlen);

        plog(LLV_DEBUG, LOCATION, NULL, "created CERT payload:\n");
        plogdump(LLV_DEBUG, cert->v, cert->l);

err:
        if (name)
                racoon_free(name);
        if (res)
                freecertinfo(res);
        return cert;
}