gistfile1.c

/* Copyright (c) 2011 Dirk-Willem van Gulik, All Rights Reserved.
 *                    <dirkx(at)webweaving(dot)org>
 * 
 * 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.
 *
 * Binaries available at 
 * 	http://people.apache.org/~dirkx/BINARIES.txt
 * 
 * $Id: mod_rangecnt.c 1004 2011-08-24 14:42:21Z dirkx $
 */

#include "httpd.h"
#include "http_config.h"
#include "http_log.h"
#include "http_protocol.h" // NetWare to get ap_hook_post_read_request() proto;

#ifndef MAXRANGEHEADERS
#define MAXRANGEHEADERS (5)
#endif

module AP_MODULE_DECLARE_DATA rangecnt_module;

static apr_status_t ap_rangecnt_early(request_rec *r)
{
   /* Should we also do  Request-Range and their ilk ?? */
    const char *p = apr_table_get(r->headers_in, "Range"); 
        int c = 0;
    if (p) {
        for (; *p; p++) {
            if (*p == ',')
                c++;
        };
        if (c > MAXRANGEHEADERS) {
            ap_log_rerror(APLOG_MARK, APLOG_WARNING, 0, r,
                          "Rejected on a Range: header with more than "
                          "%d ranges (has %d)", MAXRANGEHEADERS, c);
            return HTTP_RANGE_NOT_SATISFIABLE; 
        };
    };

    return DECLINED;
}

static void register_hooks(apr_pool_t * p)
{
    ap_hook_post_read_request(ap_rangecnt_early, NULL, NULL, APR_HOOK_FIRST);
}

#ifdef AP_DECLARE_MODULE
AP_DECLARE_MODULE(rangecnt) =
#else
module AP_MODULE_DECLARE_DATA rangecnt_module =
#endif
{
    STANDARD20_MODULE_STUFF,
    NULL,                       /* dir config creater */
    NULL,                       /* dir merger --- default is to override */
    NULL,                       /* server config */
    NULL,                       /* merge server configs */
    NULL,                       /* command apr_table_t */
    register_hooks              /* register hooks */
};