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products/sources/formale Sprachen/C/Apache/modules/ssl/ (Apache Software Stiftung Version 2.4.65^©) Datei vom 5.11.2011 mit Größe 3 kB

Quelle ssl_engine_mutex.c Sprache: C

/* 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;
}

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