diff options
Diffstat (limited to '')
| -rw-r--r-- | include/http_connection.h | 183 |
1 files changed, 183 insertions, 0 deletions
diff --git a/include/http_connection.h b/include/http_connection.h new file mode 100644 index 0000000..71f02bd --- /dev/null +++ b/include/http_connection.h @@ -0,0 +1,183 @@ +/* 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. + */ + +/** + * @file http_connection.h + * @brief Apache connection library + * + * @defgroup APACHE_CORE_CONNECTION Connection Library + * @ingroup APACHE_CORE + * @{ + */ + +#ifndef APACHE_HTTP_CONNECTION_H +#define APACHE_HTTP_CONNECTION_H + +#include "apr_network_io.h" +#include "apr_buckets.h" + +#ifdef __cplusplus +extern "C" { +#endif + +/** + * This is the protocol module driver. This calls all of the + * pre-connection and connection hooks for all protocol modules. + * @param c The connection on which the request is read + * @param csd The mechanism on which this connection is to be read. + * Most times this will be a socket, but it is up to the module + * that accepts the request to determine the exact type. + */ +AP_CORE_DECLARE(void) ap_process_connection(conn_rec *c, void *csd); + +/** + * Shutdown the connection for writing. + * @param c The connection to shutdown + * @param flush Whether or not to flush pending data before + * @return APR_SUCCESS or the underlying error + */ +AP_CORE_DECLARE(apr_status_t) ap_shutdown_conn(conn_rec *c, int flush); + +/** + * Flushes all remain data in the client send buffer + * @param c The connection to flush + * @remark calls ap_shutdown_conn(c, 1) + */ +AP_CORE_DECLARE(void) ap_flush_conn(conn_rec *c); + +/** + * This function is responsible for the following cases: + * <pre> + * we now proceed to read from the client until we get EOF, or until + * MAX_SECS_TO_LINGER has passed. The reasons for doing this are + * documented in a draft: + * + * http://tools.ietf.org/html/draft-ietf-http-connection-00.txt + * + * in a nutshell -- if we don't make this effort we risk causing + * TCP RST packets to be sent which can tear down a connection before + * all the response data has been sent to the client. + * </pre> + * @param c The connection we are closing + */ +AP_DECLARE(void) ap_lingering_close(conn_rec *c); + +AP_DECLARE(int) ap_prep_lingering_close(conn_rec *c); + +AP_DECLARE(int) ap_start_lingering_close(conn_rec *c); + +/* Hooks */ +/** + * create_connection is a RUN_FIRST hook which allows modules to create + * connections. In general, you should not install filters with the + * create_connection hook. If you require vhost configuration information + * to make filter installation decisions, you must use the pre_connection + * or install_network_transport hook. This hook should close the connection + * if it encounters a fatal error condition. + * + * @param p The pool from which to allocate the connection record + * @param server The server record to create the connection too. + * @param csd The socket that has been accepted + * @param conn_id A unique identifier for this connection. The ID only + * needs to be unique at that time, not forever. + * @param sbh A handle to scoreboard information for this connection. + * @param alloc The bucket allocator to use for all bucket/brigade creations + * @return An allocated connection record or NULL. + */ +AP_DECLARE_HOOK(conn_rec *, create_connection, + (apr_pool_t *p, server_rec *server, apr_socket_t *csd, + long conn_id, void *sbh, apr_bucket_alloc_t *alloc)) + +/** + * This hook gives protocol modules an opportunity to set everything up + * before calling the protocol handler. All pre-connection hooks are + * run until one returns something other than ok or decline + * @param c The connection on which the request has been received. + * @param csd The mechanism on which this connection is to be read. + * Most times this will be a socket, but it is up to the module + * that accepts the request to determine the exact type. + * @return OK or DECLINED + */ +AP_DECLARE_HOOK(int,pre_connection,(conn_rec *c, void *csd)) + +/** + * This hook implements different protocols. After a connection has been + * established, the protocol module must read and serve the request. This + * function does that for each protocol module. The first protocol module + * to handle the request is the last module run. + * @param c The connection on which the request has been received. + * @return OK or DECLINED + */ +AP_DECLARE_HOOK(int,process_connection,(conn_rec *c)) + +/** + * This hook implements different protocols. Before a connection is closed, + * protocols might have to perform some housekeeping actions, such as + * sending one last goodbye packet. The connection is, unless some other + * error already happened before, still open and operational. + * All pre-close-connection hooks are run until one returns something + * other than ok or decline + * @param c The connection on which the request has been received. + * @return OK or DECLINED + */ +AP_DECLARE_HOOK(int,pre_close_connection,(conn_rec *c)) + +/** + * This is a wrapper around ap_run_pre_connection. In case that + * ap_run_pre_connection returns an error it marks the connection as + * aborted and ensures that the basic connection setup normally done + * by the core module is done in case it was not done so far. + * @param c The connection on which the request has been received. + * Same as for the pre_connection hook. + * @param csd The mechanism on which this connection is to be read. + * Most times this will be a socket, but it is up to the module + * that accepts the request to determine the exact type. + * Same as for the pre_connection hook. + * @return The result of ap_run_pre_connection + */ +AP_DECLARE(int) ap_pre_connection(conn_rec *c, void *csd); + +/** End Of Connection (EOC) bucket */ +AP_DECLARE_DATA extern const apr_bucket_type_t ap_bucket_type_eoc; + +/** + * Determine if a bucket is an End Of Connection (EOC) bucket + * @param e The bucket to inspect + * @return true or false + */ +#define AP_BUCKET_IS_EOC(e) (e->type == &ap_bucket_type_eoc) + +/** + * Make the bucket passed in an End Of Connection (EOC) bucket + * @param b The bucket to make into an EOC bucket + * @return The new bucket, or NULL if allocation failed + */ +AP_DECLARE(apr_bucket *) ap_bucket_eoc_make(apr_bucket *b); + +/** + * Create a bucket referring to an End Of Connection (EOC). This indicates + * that the connection will be closed. + * @param list The freelist from which this bucket should be allocated + * @return The new bucket, or NULL if allocation failed + */ +AP_DECLARE(apr_bucket *) ap_bucket_eoc_create(apr_bucket_alloc_t *list); + +#ifdef __cplusplus +} +#endif + +#endif /* !APACHE_HTTP_CONNECTION_H */ +/** @} */ |