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http_connection.h
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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. */ /** * @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 */ /** @} */