/* Licensed to the Apache Software Foundation (ASF) under one or more

 * contributor license agreements.  See the NOTICE file distributed with

 * this work for additional information regarding copyright ownership.

 * The ASF licenses this file to You under the Apache License, Version 2.0

 * (the "License"); you may not use this file except in compliance with

 * the License.  You may obtain a copy of the License at

 *

 *     http://www.apache.org/licenses/LICENSE-2.0

 *

 * Unless required by applicable law or agreed to in writing, software

 * distributed under the License is distributed on an "AS IS" BASIS,

 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

 * See the License for the specific language governing permissions and

 * limitations under the License.

 */

/*                      _             _

 *  _ __ ___   ___   __| |    ___ ___| |  mod_ssl

 * | '_ ` _ \ / _ \ / _` |   / __/ __| |  Apache Interface to OpenSSL

 * | | | | | | (_) | (_| |   \__ \__ \ |

 * |_| |_| |_|\___/ \__,_|___|___/___/_|

 *                      |_____|

 *  ssl_engine_mutex.c

 *  Semaphore for Mutual Exclusion

 */

                             /* ``Real programmers confuse

                                  Christmas and Halloween

                                  because DEC 25 = OCT 31.''

                                             -- Unknown     */

#include "ssl_private.h"

int ssl_mutex_init(server_rec *s, apr_pool_t *p)

{

    SSLModConfigRec *mc = myModConfig(s);

    apr_status_t rv;

    /* A mutex is only needed if a session cache is configured, and

     * the provider used is not internally multi-process/thread

     * safe. */

    if (!mc->sesscache

        || (mc->sesscache->flags & AP_SOCACHE_FLAG_NOTMPSAFE) == 0) {

        return TRUE;

    }

    if (mc->pMutex) {

        return TRUE;

    }

    if ((rv = ap_global_mutex_create(&mc->pMutex, NULL, SSL_CACHE_MUTEX_TYPE,

                                     NULL, s, s->process->pool, 0))

            != APR_SUCCESS) {

        return FALSE;

    }

    return TRUE;

}

int ssl_mutex_reinit(server_rec *s, apr_pool_t *p)

{

    SSLModConfigRec *mc = myModConfig(s);

    apr_status_t rv;

    const char *lockfile;

    if (mc->pMutex == NULL || !mc->sesscache

        || (mc->sesscache->flags & AP_SOCACHE_FLAG_NOTMPSAFE) == 0) {

        return TRUE;

    }

    lockfile = apr_global_mutex_lockfile(mc->pMutex);

    if ((rv = apr_global_mutex_child_init(&mc->pMutex,

                                          lockfile,

                                          p)) != APR_SUCCESS) {

        if (lockfile)

            ap_log_error(APLOG_MARK, APLOG_ERR, rv, s, APLOGNO(02024)

                         "Cannot reinit %s mutex with file `%s'",

                         SSL_CACHE_MUTEX_TYPE, lockfile);

        else

            ap_log_error(APLOG_MARK, APLOG_WARNING, rv, s, APLOGNO(02025)

                         "Cannot reinit %s mutex", SSL_CACHE_MUTEX_TYPE);

        return FALSE;

    }

    return TRUE;

}

int ssl_mutex_on(server_rec *s)

{

    SSLModConfigRec *mc = myModConfig(s);

    apr_status_t rv;

    if ((rv = apr_global_mutex_lock(mc->pMutex)) != APR_SUCCESS) {

        ap_log_error(APLOG_MARK, APLOG_WARNING, rv, s, APLOGNO(02026)

                     "Failed to acquire SSL session cache lock");

        return FALSE;

    }

    return TRUE;

}

int ssl_mutex_off(server_rec *s)

{

    SSLModConfigRec *mc = myModConfig(s);

    apr_status_t rv;

    if ((rv = apr_global_mutex_unlock(mc->pMutex)) != APR_SUCCESS) {

        ap_log_error(APLOG_MARK, APLOG_WARNING, rv, s, APLOGNO(02027)

                     "Failed to release SSL session cache lock");

        return FALSE;

    }

    return TRUE;

}