/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License (the "License").
 * You may not use this file except in compliance with the License.
 *
 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
 * or http://www.opensolaris.org/os/licensing.
 * See the License for the specific language governing permissions
 * and limitations under the License.
 *
 * When distributing Covered Code, include this CDDL HEADER in each
 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
 * If applicable, add the following below this CDDL HEADER, with the
 * fields enclosed by brackets "[]" replaced with your own identifying
 * information: Portions Copyright [yyyy] [name of copyright owner]
 *
 * CDDL HEADER END
 */
/*
 * Copyright (c) 1999, 2010, Oracle and/or its affiliates. All rights reserved.
 */

/*
 *  glue routine for gss_export_sec_context
 */
#ifndef LEAN_CLIENT

#include <mechglueP.h>
#include "gssapiP_generic.h"
#include <stdio.h>
#include <errno.h>
#ifdef HAVE_STDLIB_H
#include <stdlib.h>
#endif
#include <string.h>

static OM_uint32 val_exp_sec_ctx_args(
        OM_uint32 *minor_status,
        gss_ctx_id_t *context_handle,
        gss_buffer_t interprocess_token)
{

        /* Initialize outputs. */

        if (minor_status != NULL)
                *minor_status = 0;

        if (interprocess_token != GSS_C_NO_BUFFER) {
                interprocess_token->length = 0;
                interprocess_token->value = NULL;
        }

        /* Validate arguments. */

        if (minor_status == NULL)
                return (GSS_S_CALL_INACCESSIBLE_WRITE);

        if (context_handle == NULL || *context_handle == GSS_C_NO_CONTEXT)
                return (GSS_S_CALL_INACCESSIBLE_READ | GSS_S_NO_CONTEXT);

        if (interprocess_token == GSS_C_NO_BUFFER)
                return (GSS_S_CALL_INACCESSIBLE_WRITE);

        return (GSS_S_COMPLETE);
}

OM_uint32
gss_export_sec_context(minor_status,
                        context_handle,
                        interprocess_token)

OM_uint32 *minor_status;
gss_ctx_id_t *context_handle;
gss_buffer_t interprocess_token;

{
        OM_uint32               status;
        OM_uint32               length;
        gss_union_ctx_id_t      ctx;
        gss_mechanism           mech;
        gss_buffer_desc         token;
        char                    *buf;

        status = val_exp_sec_ctx_args(minor_status,
                                context_handle, interprocess_token);
        if (status != GSS_S_COMPLETE)
                return (status);

        /*
         * select the approprate underlying mechanism routine and
         * call it.
         */

        ctx = (gss_union_ctx_id_t)*context_handle;
        mech = __gss_get_mechanism(ctx->mech_type);
        if (!mech)
                return (GSS_S_BAD_MECH);
        if (!mech->gss_export_sec_context)
                return (GSS_S_UNAVAILABLE);

        status = mech->gss_export_sec_context(mech->context, minor_status,
                                        &ctx->internal_ctx_id, &token);
        if (status != GSS_S_COMPLETE) {
                map_error(minor_status, mech);
                return (status);
        }

        length = token.length + 4 + ctx->mech_type->length;
        interprocess_token->length = length;
        interprocess_token->value = malloc(length);
        if (interprocess_token->value == 0) {
                (void) gss_release_buffer(minor_status, &token);
                return (GSS_S_FAILURE);
        }
        buf = interprocess_token->value;
        length = ctx->mech_type->length;
        buf[3] = (unsigned char) (length & 0xFF);
        length >>= 8;
        buf[2] = (unsigned char) (length & 0xFF);
        length >>= 8;
        buf[1] = (unsigned char) (length & 0xFF);
        length >>= 8;
        buf[0] = (unsigned char) (length & 0xFF);
        (void) memcpy(buf+4, ctx->mech_type->elements,
                        (size_t)ctx->mech_type->length);
        (void) memcpy(buf+4+ctx->mech_type->length, token.value, token.length);

        (void) gss_release_buffer(minor_status, &token);

        free(ctx->mech_type->elements);
        free(ctx->mech_type);
        free(ctx);
        *context_handle = 0;

        return (GSS_S_COMPLETE);
}
#endif /*LEAN_CLIENT */