1 /* ====================================================================
2 * The Apache Software License, Version 1.1
4 * Copyright (c) 2000-2003 The Apache Software Foundation. All rights
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 * notice, this list of conditions and the following disclaimer in
16 * the documentation and/or other materials provided with the
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20 * if any, must include the following acknowledgment:
21 * "This product includes software developed by the
22 * Apache Software Foundation (http://www.apache.org/)."
23 * Alternately, this acknowledgment may appear in the software itself,
24 * if and wherever such third-party acknowledgments normally appear.
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31 * 5. Products derived from this software may not be called "Apache",
32 * nor may "Apache" appear in their name, without prior written
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35 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
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37 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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39 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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43 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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47 * ====================================================================
49 * This software consists of voluntary contributions made by many
50 * individuals on behalf of the Apache Software Foundation. For more
51 * information on the Apache Software Foundation, please see
52 * <http://www.apache.org/>.
54 * Portions of this software are based upon public domain software
55 * originally written at the National Center for Supercomputing Applications,
56 * University of Illinois, Urbana-Champaign.
60 #include "apr_strings.h"
63 #include "ap_config.h"
65 #include "http_connection.h"
66 #include "http_request.h"
67 #include "http_protocol.h"
69 #include "mpm_default.h"
70 #include "http_config.h"
71 #include "http_core.h"
72 #include "http_vhost.h"
73 #include "scoreboard.h"
75 #include "util_filter.h"
78 APR_HOOK_LINK(create_connection)
79 APR_HOOK_LINK(process_connection)
80 APR_HOOK_LINK(pre_connection)
82 AP_IMPLEMENT_HOOK_RUN_FIRST(conn_rec *,create_connection,
83 (apr_pool_t *p, server_rec *server, apr_socket_t *csd, long conn_id, void *sbh, apr_bucket_alloc_t *alloc),
84 (p, server, csd, conn_id, sbh, alloc), NULL)
85 AP_IMPLEMENT_HOOK_RUN_FIRST(int,process_connection,(conn_rec *c),(c),DECLINED)
86 AP_IMPLEMENT_HOOK_RUN_ALL(int,pre_connection,(conn_rec *c, void *csd),(c, csd),OK,DECLINED)
88 * More machine-dependent networking gooo... on some systems,
89 * you've got to be *really* sure that all the packets are acknowledged
90 * before closing the connection, since the client will not be able
91 * to see the last response if their TCP buffer is flushed by a RST
92 * packet from us, which is what the server's TCP stack will send
93 * if it receives any request data after closing the connection.
95 * In an ideal world, this function would be accomplished by simply
96 * setting the socket option SO_LINGER and handling it within the
97 * server's TCP stack while the process continues on to the next request.
98 * Unfortunately, it seems that most (if not all) operating systems
99 * block the server process on close() when SO_LINGER is used.
100 * For those that don't, see USE_SO_LINGER below. For the rest,
101 * we have created a home-brew lingering_close.
103 * Many operating systems tend to block, puke, or otherwise mishandle
104 * calls to shutdown only half of the connection. You should define
105 * NO_LINGCLOSE in ap_config.h if such is the case for your system.
107 #ifndef MAX_SECS_TO_LINGER
108 #define MAX_SECS_TO_LINGER 30
111 AP_CORE_DECLARE(void) ap_flush_conn(conn_rec *c)
113 apr_bucket_brigade *bb;
116 bb = apr_brigade_create(c->pool, c->bucket_alloc);
117 b = apr_bucket_flush_create(c->bucket_alloc);
118 APR_BRIGADE_INSERT_TAIL(bb, b);
119 ap_pass_brigade(c->output_filters, bb);
122 /* we now proceed to read from the client until we get EOF, or until
123 * MAX_SECS_TO_LINGER has passed. the reasons for doing this are
124 * documented in a draft:
126 * http://www.ics.uci.edu/pub/ietf/http/draft-ietf-http-connection-00.txt
128 * in a nutshell -- if we don't make this effort we risk causing
129 * TCP RST packets to be sent which can tear down a connection before
130 * all the response data has been sent to the client.
132 #define SECONDS_TO_LINGER 2
133 AP_DECLARE(void) ap_lingering_close(conn_rec *c)
136 apr_size_t nbytes = sizeof(dummybuf);
139 apr_int32_t total_linger_time = 0;
140 apr_socket_t *csd = ap_get_module_config(c->conn_config, &core_module);
146 ap_update_child_status(c->sbh, SERVER_CLOSING, NULL);
149 ap_flush_conn(c); /* just close it */
150 apr_socket_close(csd);
154 /* Close the connection, being careful to send out whatever is still
155 * in our buffers. If possible, try to avoid a hard close until the
156 * client has ACKed our FIN and/or has stopped sending us data.
159 /* Send any leftover data to the client, but never try to again */
163 apr_socket_close(csd);
167 /* Shut down the socket for write, which will send a FIN
170 if (apr_socket_shutdown(csd, APR_SHUTDOWN_WRITE) != APR_SUCCESS
172 apr_socket_close(csd);
176 /* Read all data from the peer until we reach "end-of-file" (FIN
177 * from peer) or we've exceeded our overall timeout. If the client does
178 * not send us bytes within 2 seconds (a value pulled from Apache 1.3
179 * which seems to work well), close the connection.
181 timeout = apr_time_from_sec(SECONDS_TO_LINGER);
182 apr_socket_timeout_set(csd, timeout);
183 apr_socket_opt_set(csd, APR_INCOMPLETE_READ, 1);
185 nbytes = sizeof(dummybuf);
186 rc = apr_socket_recv(csd, dummybuf, &nbytes);
187 if (rc != APR_SUCCESS || nbytes == 0)
190 total_linger_time += SECONDS_TO_LINGER;
191 if (total_linger_time >= MAX_SECS_TO_LINGER) {
196 apr_socket_close(csd);
200 AP_CORE_DECLARE(void) ap_process_connection(conn_rec *c, void *csd)
203 ap_update_vhost_given_ip(c);
205 rc = ap_run_pre_connection(c, csd);
206 if (rc != OK && rc != DONE) {
211 ap_run_process_connection(c);