1 /* ====================================================================
2 * The Apache Software License, Version 1.1
4 * Copyright (c) 2000-2001 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.
26 * 4. The names "Apache" and "Apache Software Foundation" must
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29 * permission, please contact apache@apache.org.
31 * 5. Products derived from this software may not be called "Apache",
32 * nor may "Apache" appear in their name, without prior written
33 * permission of the Apache Software Foundation.
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
38 * DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
39 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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41 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
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43 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
44 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
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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(pre_connection)
79 APR_HOOK_LINK(process_connection)
80 APR_HOOK_LINK(create_connection)
83 AP_IMPLEMENT_HOOK_RUN_ALL(int,pre_connection,(conn_rec *c),(c),OK,DECLINED)
84 AP_IMPLEMENT_HOOK_RUN_FIRST(int,process_connection,(conn_rec *c),(c),DECLINED)
85 AP_IMPLEMENT_HOOK_RUN_FIRST(conn_rec *,create_connection,
86 (apr_pool_t *p, server_rec *server, apr_socket_t *csd, int conn_id),
87 (p, server, csd, conn_id), NULL)
90 * More machine-dependent networking gooo... on some systems,
91 * you've got to be *really* sure that all the packets are acknowledged
92 * before closing the connection, since the client will not be able
93 * to see the last response if their TCP buffer is flushed by a RST
94 * packet from us, which is what the server's TCP stack will send
95 * if it receives any request data after closing the connection.
97 * In an ideal world, this function would be accomplished by simply
98 * setting the socket option SO_LINGER and handling it within the
99 * server's TCP stack while the process continues on to the next request.
100 * Unfortunately, it seems that most (if not all) operating systems
101 * block the server process on close() when SO_LINGER is used.
102 * For those that don't, see USE_SO_LINGER below. For the rest,
103 * we have created a home-brew lingering_close.
105 * Many operating systems tend to block, puke, or otherwise mishandle
106 * calls to shutdown only half of the connection. You should define
107 * NO_LINGCLOSE in ap_config.h if such is the case for your system.
109 #ifndef MAX_SECS_TO_LINGER
110 #define MAX_SECS_TO_LINGER 30
114 #define NO_LINGCLOSE /* The two lingering options are exclusive */
116 static void sock_enable_linger(int s)
121 li.l_linger = MAX_SECS_TO_LINGER;
123 if (setsockopt(s, SOL_SOCKET, SO_LINGER,
124 (char *) &li, sizeof(struct linger)) < 0) {
125 ap_log_error(APLOG_MARK, APLOG_WARNING, errno, server_conf,
126 "setsockopt: (SO_LINGER)");
127 /* not a fatal error */
132 #define sock_enable_linger(s) /* NOOP */
133 #endif /* USE_SO_LINGER */
135 AP_CORE_DECLARE(void) ap_flush_conn(conn_rec *c)
137 apr_bucket_brigade *bb;
140 bb = apr_brigade_create(c->pool);
141 b = apr_bucket_flush_create();
142 APR_BRIGADE_INSERT_TAIL(bb, b);
143 ap_pass_brigade(c->output_filters, bb);
146 /* we now proceed to read from the client until we get EOF, or until
147 * MAX_SECS_TO_LINGER has passed. the reasons for doing this are
148 * documented in a draft:
150 * http://www.ics.uci.edu/pub/ietf/http/draft-ietf-http-connection-00.txt
152 * in a nutshell -- if we don't make this effort we risk causing
153 * TCP RST packets to be sent which can tear down a connection before
154 * all the response data has been sent to the client.
156 #define SECONDS_TO_LINGER 2
157 AP_DECLARE(void) ap_lingering_close(conn_rec *c)
160 apr_size_t nbytes = sizeof(dummybuf);
163 apr_int32_t total_linger_time = 0;
164 apr_socket_t *csd = ap_get_module_config(c->conn_config, &core_module);
170 ap_update_child_status(AP_CHILD_THREAD_FROM_ID(c->id), SERVER_CLOSING, NULL);
173 ap_flush_conn(c); /* just close it */
174 apr_socket_close(csd);
178 /* Close the connection, being careful to send out whatever is still
179 * in our buffers. If possible, try to avoid a hard close until the
180 * client has ACKed our FIN and/or has stopped sending us data.
183 /* Send any leftover data to the client, but never try to again */
187 apr_socket_close(csd);
191 /* Shut down the socket for write, which will send a FIN
194 if (apr_shutdown(csd, APR_SHUTDOWN_WRITE) != APR_SUCCESS ||
196 apr_socket_close(csd);
200 /* Read all data from the peer until we reach "end-of-file" (FIN
201 * from peer) or we've exceeded our overall timeout. If the client does
202 * not send us bytes within 2 seconds (a value pulled from Apache 1.3
203 * which seems to work well), close the connection.
205 timeout = SECONDS_TO_LINGER * APR_USEC_PER_SEC;
206 apr_setsocketopt(csd, APR_SO_TIMEOUT, timeout);
207 apr_setsocketopt(csd, APR_INCOMPLETE_READ, 1);
209 nbytes = sizeof(dummybuf);
210 rc = apr_recv(csd, dummybuf, &nbytes);
211 if (rc != APR_SUCCESS || nbytes == 0) break;
213 total_linger_time += SECONDS_TO_LINGER;
214 if (total_linger_time >= MAX_SECS_TO_LINGER) {
219 apr_socket_close(csd);
223 AP_CORE_DECLARE(void) ap_process_connection(conn_rec *c)
225 ap_update_vhost_given_ip(c);
227 ap_run_pre_connection(c);
229 ap_run_process_connection(c);