/*-
 * SPDX-License-Identifier: BSD-2-Clause
 *
 * Copyright (c) 2008 Doug Rabson
 * 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.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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/param.h>
#include <sys/systm.h>
#include <sys/kobj.h>
#include <sys/lock.h>
#include <sys/malloc.h>
#include <sys/mutex.h>

#include <rpc/rpc.h>
#include <rpc/rpcsec_gss.h>

#include "rpcsec_gss_int.h"

bool_t
rpc_gss_mech_to_oid(const char *mech, gss_OID *oid_ret)
{
        gss_OID oid = kgss_find_mech_by_name(mech);

        if (oid) {
                *oid_ret = oid;
                return (TRUE);
        }
        _rpc_gss_set_error(RPC_GSS_ER_SYSTEMERROR, ENOENT);
        return (FALSE);
}

bool_t
rpc_gss_oid_to_mech(gss_OID oid, const char **mech_ret)
{
        const char *name = kgss_find_mech_by_oid(oid);

        if (name) {
                *mech_ret = name;
                return (TRUE);
        }
        _rpc_gss_set_error(RPC_GSS_ER_SYSTEMERROR, ENOENT);
        return (FALSE);
}

bool_t
rpc_gss_qop_to_num(const char *qop, const char *mech, u_int *num_ret)
{

        if (!strcmp(qop, "default")) {
                *num_ret = GSS_C_QOP_DEFAULT;
                return (TRUE);
        }
        _rpc_gss_set_error(RPC_GSS_ER_SYSTEMERROR, ENOENT);
        return (FALSE);
}

const char *
_rpc_gss_num_to_qop(const char *mech, u_int num)
{

        if (num == GSS_C_QOP_DEFAULT)
                return "default";

        return (NULL);
}

const char **
rpc_gss_get_mechanisms(void)
{
        static const char **mech_names = NULL;
        struct kgss_mech *km;
        int count;

        if (mech_names)
                return (mech_names);

        count = 0;
        LIST_FOREACH(km, &kgss_mechs, km_link) {
                count++;
        }
        count++;

        mech_names = malloc(count * sizeof(const char *), M_RPC, M_WAITOK);
        count = 0;
        LIST_FOREACH(km, &kgss_mechs, km_link) {
                mech_names[count++] = km->km_mech_name;
        }
        mech_names[count++] = NULL;
        
        return (mech_names);
}

#if 0
const char **
rpc_gss_get_mech_info(const char *mech, rpc_gss_service_t *service)
{
        struct mech_info *info;

        _rpc_gss_load_mech();
        _rpc_gss_load_qop();
        SLIST_FOREACH(info, &mechs, link) {
                if (!strcmp(mech, info->name)) {
                        /*
                         * I'm not sure what to do with service
                         * here. The Solaris manpages are not clear on
                         * the subject and the OpenSolaris code just
                         * sets it to rpc_gss_svc_privacy
                         * unconditionally with a comment noting that
                         * it is bogus.
                         */
                        *service = rpc_gss_svc_privacy;
                        return info->qops;
                }
        }

        _rpc_gss_set_error(RPC_GSS_ER_SYSTEMERROR, ENOENT);
        return (NULL);
}
#endif

bool_t
rpc_gss_get_versions(u_int *vers_hi, u_int *vers_lo)
{

        *vers_hi = 1;
        *vers_lo = 1;
        return (TRUE);
}

bool_t
rpc_gss_is_installed(const char *mech)
{
        gss_OID oid = kgss_find_mech_by_name(mech);

        if (oid)
                return (TRUE);
        else
                return (FALSE);
}