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/* Copyright 2015 greenbytes GmbH (https://www.greenbytes.de)
*
* Licensed 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.
*/
#include <assert.h>
#include <stddef.h>
#include <apr_atomic.h>
#include <apr_thread_cond.h>
#include <apr_strings.h>
#include <httpd.h>
#include <http_core.h>
#include <http_connection.h>
#include <http_protocol.h>
#include <http_request.h>
#include <http_log.h>
#include <http_vhost.h>
#include <util_filter.h>
#include <ap_mpm.h>
#include <mod_core.h>
#include <scoreboard.h>
#include "h2_private.h"
#include "h2_conn.h"
#include "h2_config.h"
#include "h2_from_h1.h"
#include "h2_h2.h"
#include "h2_mplx.h"
#include "h2_request.h"
#include "h2_session.h"
#include "h2_stream.h"
#include "h2_task_input.h"
#include "h2_task_output.h"
#include "h2_task.h"
#include "h2_ctx.h"
#include "h2_worker.h"
static apr_status_t h2_filter_stream_input(ap_filter_t* filter,
apr_bucket_brigade* brigade,
ap_input_mode_t mode,
apr_read_type_e block,
apr_off_t readbytes) {
h2_task *task = filter->ctx;
AP_DEBUG_ASSERT(task);
if (!task->input) {
return APR_ECONNABORTED;
}
return h2_task_input_read(task->input, filter, brigade,
mode, block, readbytes);
}
static apr_status_t h2_filter_stream_output(ap_filter_t* filter,
apr_bucket_brigade* brigade) {
h2_task *task = filter->ctx;
AP_DEBUG_ASSERT(task);
if (!task->output) {
return APR_ECONNABORTED;
}
return h2_task_output_write(task->output, filter, brigade);
}
static apr_status_t h2_filter_read_response(ap_filter_t* f,
apr_bucket_brigade* bb) {
h2_task *task = f->ctx;
AP_DEBUG_ASSERT(task);
if (!task->output || !task->output->from_h1) {
return APR_ECONNABORTED;
}
return h2_from_h1_read_response(task->output->from_h1, f, bb);
}
/*******************************************************************************
* Register various hooks
*/
static const char *const mod_ssl[] = { "mod_ssl.c", NULL};
static int h2_task_pre_conn(conn_rec* c, void *arg);
static int h2_task_process_conn(conn_rec* c);
void h2_task_register_hooks(void)
{
/* This hook runs on new connections before mod_ssl has a say.
* Its purpose is to prevent mod_ssl from touching our pseudo-connections
* for streams.
*/
ap_hook_pre_connection(h2_task_pre_conn,
NULL, mod_ssl, APR_HOOK_FIRST);
/* When the connection processing actually starts, we might to
* take over, if the connection is for a task.
*/
ap_hook_process_connection(h2_task_process_conn,
NULL, NULL, APR_HOOK_FIRST);
ap_register_output_filter("H2_RESPONSE", h2_response_output_filter,
NULL, AP_FTYPE_PROTOCOL);
ap_register_input_filter("H2_TO_H1", h2_filter_stream_input,
NULL, AP_FTYPE_NETWORK);
ap_register_output_filter("H1_TO_H2", h2_filter_stream_output,
NULL, AP_FTYPE_NETWORK);
ap_register_output_filter("H1_TO_H2_RESP", h2_filter_read_response,
NULL, AP_FTYPE_PROTOCOL);
ap_register_output_filter("H2_TRAILERS", h2_response_trailers_filter,
NULL, AP_FTYPE_PROTOCOL);
}
static int h2_task_pre_conn(conn_rec* c, void *arg)
{
h2_ctx *ctx = h2_ctx_get(c);
(void)arg;
if (h2_ctx_is_task(ctx)) {
h2_task *task = h2_ctx_get_task(ctx);
ap_log_cerror(APLOG_MARK, APLOG_TRACE2, 0, c,
"h2_h2, pre_connection, found stream task");
/* Add our own, network level in- and output filters.
*/
ap_add_input_filter("H2_TO_H1", task, NULL, c);
ap_add_output_filter("H1_TO_H2", task, NULL, c);
}
return OK;
}
h2_task *h2_task_create(long session_id, const h2_request *req,
apr_pool_t *pool, h2_mplx *mplx, int eos)
{
h2_task *task = apr_pcalloc(pool, sizeof(h2_task));
if (task == NULL) {
ap_log_perror(APLOG_MARK, APLOG_ERR, APR_ENOMEM, pool,
APLOGNO(02941) "h2_task(%ld-%d): create stream task",
session_id, req->id);
h2_mplx_out_close(mplx, req->id, NULL);
return NULL;
}
task->id = apr_psprintf(pool, "%ld-%d", session_id, req->id);
task->stream_id = req->id;
task->pool = pool;
task->mplx = mplx;
task->c = h2_conn_create(mplx->c, task->pool);
task->request = req;
task->input_eos = eos;
return task;
}
apr_status_t h2_task_destroy(h2_task *task)
{
(void)task;
return APR_SUCCESS;
}
apr_status_t h2_task_do(h2_task *task, h2_worker *worker)
{
apr_status_t status = APR_SUCCESS;
h2_config *cfg = h2_config_get(task->mplx->c);
AP_DEBUG_ASSERT(task);
task->serialize_headers = h2_config_geti(cfg, H2_CONF_SER_HEADERS);
status = h2_worker_setup_task(worker, task);
/* save in connection that this one is a pseudo connection */
h2_ctx_create_for(task->c, task);
if (status == APR_SUCCESS) {
task->input = h2_task_input_create(task, task->pool,
task->c->bucket_alloc);
task->output = h2_task_output_create(task, task->pool);
ap_process_connection(task->c, h2_worker_get_socket(worker));
ap_log_cerror(APLOG_MARK, APLOG_TRACE1, 0, task->c,
"h2_task(%s): processing done", task->id);
}
else {
ap_log_cerror(APLOG_MARK, APLOG_WARNING, status, task->c,
APLOGNO(02957) "h2_task(%s): error setting up h2_task",
task->id);
}
if (task->input) {
h2_task_input_destroy(task->input);
task->input = NULL;
}
if (task->output) {
h2_task_output_close(task->output);
h2_task_output_destroy(task->output);
task->output = NULL;
}
if (task->io) {
apr_thread_cond_signal(task->io);
}
h2_worker_release_task(worker, task);
h2_mplx_task_done(task->mplx, task->stream_id);
return status;
}
static apr_status_t h2_task_process_request(const h2_request *req, conn_rec *c)
{
request_rec *r;
conn_state_t *cs = c->cs;
r = h2_request_create_rec(req, c);
if (r && (r->status == HTTP_OK)) {
ap_update_child_status(c->sbh, SERVER_BUSY_READ, r);
if (cs)
cs->state = CONN_STATE_HANDLER;
ap_process_request(r);
/* After the call to ap_process_request, the
* request pool will have been deleted. We set
* r=NULL here to ensure that any dereference
* of r that might be added later in this function
* will result in a segfault immediately instead
* of nondeterministic failures later.
*/
if (cs)
cs->state = CONN_STATE_WRITE_COMPLETION;
r = NULL;
}
ap_update_child_status(c->sbh, SERVER_BUSY_WRITE, NULL);
c->sbh = NULL;
return APR_SUCCESS;
}
static int h2_task_process_conn(conn_rec* c)
{
h2_ctx *ctx = h2_ctx_get(c);
if (h2_ctx_is_task(ctx)) {
if (!ctx->task->serialize_headers) {
ap_log_cerror(APLOG_MARK, APLOG_TRACE2, 0, c,
"h2_h2, processing request directly");
h2_task_process_request(ctx->task->request, c);
return DONE;
}
ap_log_cerror(APLOG_MARK, APLOG_TRACE2, 0, c,
"h2_task(%s), serialized handling", ctx->task->id);
}
return DECLINED;
}
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