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/* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership.
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* The ASF licenses this file to You under the Apache License, Version 2.0
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* (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.apache.org/licenses/LICENSE-2.0
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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#include "apr_strings.h"
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#include "ap_config.h"
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#include "http_connection.h"
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#include "http_request.h"
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#include "http_protocol.h"
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#include "mpm_default.h"
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#include "http_config.h"
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#include "http_core.h"
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#include "http_vhost.h"
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#include "scoreboard.h"
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#include "util_filter.h"
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APR_HOOK_LINK(create_connection)
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APR_HOOK_LINK(process_connection)
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APR_HOOK_LINK(pre_connection)
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AP_IMPLEMENT_HOOK_RUN_FIRST(conn_rec *,create_connection,
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(apr_pool_t *p, server_rec *server, apr_socket_t *csd, long conn_id, void *sbh, apr_bucket_alloc_t *alloc),
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(p, server, csd, conn_id, sbh, alloc), NULL)
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AP_IMPLEMENT_HOOK_RUN_FIRST(int,process_connection,(conn_rec *c),(c),DECLINED)
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AP_IMPLEMENT_HOOK_RUN_ALL(int,pre_connection,(conn_rec *c, void *csd),(c, csd),OK,DECLINED)
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* More machine-dependent networking gooo... on some systems,
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* you've got to be *really* sure that all the packets are acknowledged
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* before closing the connection, since the client will not be able
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* to see the last response if their TCP buffer is flushed by a RST
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* packet from us, which is what the server's TCP stack will send
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* if it receives any request data after closing the connection.
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* In an ideal world, this function would be accomplished by simply
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* setting the socket option SO_LINGER and handling it within the
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* server's TCP stack while the process continues on to the next request.
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* Unfortunately, it seems that most (if not all) operating systems
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* block the server process on close() when SO_LINGER is used.
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* For those that don't, see USE_SO_LINGER below. For the rest,
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* we have created a home-brew lingering_close.
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* Many operating systems tend to block, puke, or otherwise mishandle
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* calls to shutdown only half of the connection. You should define
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* NO_LINGCLOSE in ap_config.h if such is the case for your system.
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#ifndef MAX_SECS_TO_LINGER
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#define MAX_SECS_TO_LINGER 30
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AP_CORE_DECLARE(void) ap_flush_conn(conn_rec *c)
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apr_bucket_brigade *bb;
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bb = apr_brigade_create(c->pool, c->bucket_alloc);
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b = apr_bucket_flush_create(c->bucket_alloc);
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APR_BRIGADE_INSERT_TAIL(bb, b);
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/* End Of Connection bucket */
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b = ap_bucket_eoc_create(c->bucket_alloc);
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APR_BRIGADE_INSERT_TAIL(bb, b);
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ap_pass_brigade(c->output_filters, bb);
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/* we now proceed to read from the client until we get EOF, or until
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* MAX_SECS_TO_LINGER has passed. the reasons for doing this are
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* documented in a draft:
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* http://www.ics.uci.edu/pub/ietf/http/draft-ietf-http-connection-00.txt
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* in a nutshell -- if we don't make this effort we risk causing
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* TCP RST packets to be sent which can tear down a connection before
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* all the response data has been sent to the client.
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#define SECONDS_TO_LINGER 2
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AP_DECLARE(void) ap_lingering_close(conn_rec *c)
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apr_time_t timeup = 0;
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apr_socket_t *csd = ap_get_module_config(c->conn_config, &core_module);
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ap_update_child_status(c->sbh, SERVER_CLOSING, NULL);
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ap_flush_conn(c); /* just close it */
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apr_socket_close(csd);
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/* Close the connection, being careful to send out whatever is still
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* in our buffers. If possible, try to avoid a hard close until the
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* client has ACKed our FIN and/or has stopped sending us data.
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/* Send any leftover data to the client, but never try to again */
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apr_socket_close(csd);
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/* Shut down the socket for write, which will send a FIN
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if (apr_socket_shutdown(csd, APR_SHUTDOWN_WRITE) != APR_SUCCESS
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apr_socket_close(csd);
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/* Read available data from the client whilst it continues sending
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* it, for a maximum time of MAX_SECS_TO_LINGER. If the client
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* does not send any data within 2 seconds (a value pulled from
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* Apache 1.3 which seems to work well), give up.
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apr_socket_timeout_set(csd, apr_time_from_sec(SECONDS_TO_LINGER));
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apr_socket_opt_set(csd, APR_INCOMPLETE_READ, 1);
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/* The common path here is that the initial apr_socket_recv() call
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* will return 0 bytes read; so that case must avoid the expensive
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* apr_time_now() call and time arithmetic. */
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nbytes = sizeof(dummybuf);
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if (apr_socket_recv(csd, dummybuf, &nbytes) || nbytes == 0)
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/* First time through; calculate now + 30 seconds. */
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timeup = apr_time_now() + apr_time_from_sec(MAX_SECS_TO_LINGER);
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} while (apr_time_now() < timeup);
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apr_socket_close(csd);
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AP_CORE_DECLARE(void) ap_process_connection(conn_rec *c, void *csd)
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ap_update_vhost_given_ip(c);
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rc = ap_run_pre_connection(c, csd);
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if (rc != OK && rc != DONE) {
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ap_run_process_connection(c);