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/* 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_bucketeer.c: split buckets whenever we find a control-char
*
* Written by Ian Holsman
*
*/
#include "httpd.h"
#include "http_config.h"
#include "http_log.h"
#include "apr_strings.h"
#include "apr_general.h"
#include "util_filter.h"
#include "apr_buckets.h"
#include "http_request.h"
#include "http_protocol.h"
static const char bucketeerFilterName[] = "BUCKETEER";
module AP_MODULE_DECLARE_DATA bucketeer_module;
typedef struct bucketeer_filter_config_t
{
char bucketdelimiter;
char passdelimiter;
char flushdelimiter;
} bucketeer_filter_config_t;
static void *create_bucketeer_server_config(apr_pool_t *p, server_rec *s)
{
bucketeer_filter_config_t *c = apr_pcalloc(p, sizeof *c);
c->bucketdelimiter = 0x02; /* ^B */
c->passdelimiter = 0x10; /* ^P */
c->flushdelimiter = 0x06; /* ^F */
return c;
}
typedef struct bucketeer_ctx_t
{
apr_bucket_brigade *bb;
} bucketeer_ctx_t;
static apr_status_t bucketeer_out_filter(ap_filter_t *f,
apr_bucket_brigade *bb)
{
apr_bucket *e;
request_rec *r = f->r;
bucketeer_ctx_t *ctx = f->ctx;
bucketeer_filter_config_t *c;
c = ap_get_module_config(r->server->module_config, &bucketeer_module);
/* If have a context, it means we've done this before successfully. */
if (!ctx) {
if (!r->content_type || strncmp(r->content_type, "text/", 5)) {
ap_remove_output_filter(f);
return ap_pass_brigade(f->next, bb);
}
/* We're cool with filtering this. */
ctx = f->ctx = apr_pcalloc(f->r->pool, sizeof(*ctx));
ctx->bb = apr_brigade_create(f->r->pool, f->c->bucket_alloc);
apr_table_unset(f->r->headers_out, "Content-Length");
}
for (e = APR_BRIGADE_FIRST(bb);
e != APR_BRIGADE_SENTINEL(bb);
e = APR_BUCKET_NEXT(e))
{
const char *data;
apr_size_t len, i, lastpos;
if (APR_BUCKET_IS_EOS(e)) {
APR_BUCKET_REMOVE(e);
APR_BRIGADE_INSERT_TAIL(ctx->bb, e);
/* Okay, we've seen the EOS.
* Time to pass it along down the chain.
*/
return ap_pass_brigade(f->next, ctx->bb);
}
if (APR_BUCKET_IS_FLUSH(e)) {
/*
* Ignore flush buckets for the moment..
* we decide what to stream
*/
continue;
}
if (APR_BUCKET_IS_METADATA(e)) {
/* metadata bucket */
apr_bucket *cpy;
apr_bucket_copy(e, &cpy);
APR_BRIGADE_INSERT_TAIL(ctx->bb, cpy);
continue;
}
/* read */
apr_bucket_read(e, &data, &len, APR_BLOCK_READ);
if (len > 0) {
lastpos = 0;
for (i = 0; i < len; i++) {
if (data[i] == c->flushdelimiter ||
data[i] == c->bucketdelimiter ||
data[i] == c->passdelimiter) {
apr_bucket *p;
if (i - lastpos > 0) {
p = apr_bucket_pool_create(apr_pmemdup(f->r->pool,
&data[lastpos],
i - lastpos),
i - lastpos,
f->r->pool,
f->c->bucket_alloc);
APR_BRIGADE_INSERT_TAIL(ctx->bb, p);
}
lastpos = i + 1;
if (data[i] == c->flushdelimiter) {
p = apr_bucket_flush_create(f->c->bucket_alloc);
APR_BRIGADE_INSERT_TAIL(ctx->bb, p);
}
if (data[i] == c->passdelimiter) {
apr_status_t rv;
rv = ap_pass_brigade(f->next, ctx->bb);
if (rv) {
return rv;
}
}
}
}
/* XXX: really should append this to the next 'real' bucket */
if (lastpos < i) {
apr_bucket *p;
p = apr_bucket_pool_create(apr_pmemdup(f->r->pool,
&data[lastpos],
i - lastpos),
i - lastpos,
f->r->pool,
f->c->bucket_alloc);
lastpos = i;
APR_BRIGADE_INSERT_TAIL(ctx->bb, p);
}
}
}
return APR_SUCCESS;
}
static void register_hooks(apr_pool_t * p)
{
ap_register_output_filter(bucketeerFilterName, bucketeer_out_filter,
NULL, AP_FTYPE_RESOURCE-1);
}
static const command_rec bucketeer_filter_cmds[] = {
{NULL}
};
AP_DECLARE_MODULE(bucketeer) = {
STANDARD20_MODULE_STUFF,
NULL,
NULL,
create_bucketeer_server_config,
NULL,
bucketeer_filter_cmds,
register_hooks
};
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