1 /* ====================================================================
2 * The Apache Software License, Version 1.1
4 * Copyright (c) 2000-2001 The Apache Software Foundation. All rights
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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
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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",
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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
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,
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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_vhost.h"
72 #include "scoreboard.h"
74 #include "util_filter.h"
77 APR_HOOK_LINK(pre_connection)
78 APR_HOOK_LINK(process_connection)
81 AP_IMPLEMENT_HOOK_RUN_ALL(int,pre_connection,(conn_rec *c),(c),OK,DECLINED)
82 AP_IMPLEMENT_HOOK_RUN_FIRST(int,process_connection,(conn_rec *c),(c),DECLINED)
85 * More machine-dependent networking gooo... on some systems,
86 * you've got to be *really* sure that all the packets are acknowledged
87 * before closing the connection, since the client will not be able
88 * to see the last response if their TCP buffer is flushed by a RST
89 * packet from us, which is what the server's TCP stack will send
90 * if it receives any request data after closing the connection.
92 * In an ideal world, this function would be accomplished by simply
93 * setting the socket option SO_LINGER and handling it within the
94 * server's TCP stack while the process continues on to the next request.
95 * Unfortunately, it seems that most (if not all) operating systems
96 * block the server process on close() when SO_LINGER is used.
97 * For those that don't, see USE_SO_LINGER below. For the rest,
98 * we have created a home-brew lingering_close.
100 * Many operating systems tend to block, puke, or otherwise mishandle
101 * calls to shutdown only half of the connection. You should define
102 * NO_LINGCLOSE in ap_config.h if such is the case for your system.
104 #ifndef MAX_SECS_TO_LINGER
105 #define MAX_SECS_TO_LINGER 30
109 #define NO_LINGCLOSE /* The two lingering options are exclusive */
111 static void sock_enable_linger(int s)
116 li.l_linger = MAX_SECS_TO_LINGER;
118 if (setsockopt(s, SOL_SOCKET, SO_LINGER,
119 (char *) &li, sizeof(struct linger)) < 0) {
120 ap_log_error(APLOG_MARK, APLOG_WARNING, errno, server_conf,
121 "setsockopt: (SO_LINGER)");
122 /* not a fatal error */
127 #define sock_enable_linger(s) /* NOOP */
128 #endif /* USE_SO_LINGER */
130 AP_CORE_DECLARE(void) ap_flush_conn(conn_rec *c)
132 apr_bucket_brigade *bb;
135 bb = apr_brigade_create(c->pool);
136 b = apr_bucket_flush_create();
137 APR_BRIGADE_INSERT_TAIL(bb, b);
138 ap_pass_brigade(c->output_filters, bb);
141 /* we now proceed to read from the client until we get EOF, or until
142 * MAX_SECS_TO_LINGER has passed. the reasons for doing this are
143 * documented in a draft:
145 * http://www.ics.uci.edu/pub/ietf/http/draft-ietf-http-connection-00.txt
147 * in a nutshell -- if we don't make this effort we risk causing
148 * TCP RST packets to be sent which can tear down a connection before
149 * all the response data has been sent to the client.
151 #define SECONDS_TO_LINGER 2
152 void ap_lingering_close(conn_rec *c)
155 apr_size_t nbytes = sizeof(dummybuf);
158 apr_int32_t total_linger_time = 0;
160 ap_update_child_status(AP_CHILD_THREAD_FROM_ID(c->id), SERVER_CLOSING, NULL);
163 ap_flush_conn(c); /* just close it */
164 apr_socket_close(c->client_socket);
168 /* Close the connection, being careful to send out whatever is still
169 * in our buffers. If possible, try to avoid a hard close until the
170 * client has ACKed our FIN and/or has stopped sending us data.
173 /* Send any leftover data to the client, but never try to again */
177 apr_socket_close(c->client_socket);
181 /* Shut down the socket for write, which will send a FIN
185 if (apr_shutdown(c->client_socket, APR_SHUTDOWN_WRITE) != APR_SUCCESS ||
187 apr_socket_close(c->client_socket);
191 /* Read all data from the peer until we reach "end-of-file" (FIN
192 * from peer) or we've exceeded our overall timeout. If the client does
193 * not send us bytes within 2 seconds (a value pulled from Apache 1.3
194 * which seems to work well), close the connection.
196 timeout = SECONDS_TO_LINGER * APR_USEC_PER_SEC;
197 apr_setsocketopt(c->client_socket, APR_SO_TIMEOUT, timeout);
198 apr_setsocketopt(c->client_socket, APR_INCOMPLETE_READ, 1);
200 nbytes = sizeof(dummybuf);
201 rc = apr_recv(c->client_socket, dummybuf, &nbytes);
202 if (rc != APR_SUCCESS || nbytes == 0) break;
204 total_linger_time += SECONDS_TO_LINGER;
205 if (total_linger_time >= MAX_SECS_TO_LINGER) {
210 apr_socket_close(c->client_socket);
213 AP_CORE_DECLARE(void) ap_process_connection(conn_rec *c)
215 ap_update_vhost_given_ip(c);
217 ap_run_pre_connection(c);
219 ap_run_process_connection(c);
223 /* Clearly some of this stuff doesn't belong in a generalised connection
224 structure, but for now...
227 AP_CORE_DECLARE(conn_rec *)ap_new_connection(apr_pool_t *p, server_rec *server,
228 apr_socket_t *inout, long id)
230 conn_rec *conn = (conn_rec *) apr_pcalloc(p, sizeof(conn_rec));
233 (void) ap_update_child_status(AP_CHILD_THREAD_FROM_ID(id),
234 SERVER_BUSY_READ, (request_rec *) NULL);
236 /* Got a connection structure, so initialize what fields we can
237 * (the rest are zeroed out by pcalloc).
240 conn->conn_config=ap_create_conn_config(p);
241 conn->notes = apr_table_make(p, 5);
244 if ((rv = apr_socket_addr_get(&conn->local_addr, APR_LOCAL, inout))
246 ap_log_error(APLOG_MARK, APLOG_INFO, rv, server,
247 "apr_socket_addr_get(APR_LOCAL)");
248 apr_socket_close(inout);
251 apr_sockaddr_ip_get(&conn->local_ip, conn->local_addr);
252 if ((rv = apr_socket_addr_get(&conn->remote_addr, APR_REMOTE, inout))
254 ap_log_error(APLOG_MARK, APLOG_INFO, rv, server,
255 "apr_socket_addr_get(APR_REMOTE)");
256 apr_socket_close(inout);
259 apr_sockaddr_ip_get(&conn->remote_ip, conn->remote_addr);
260 conn->base_server = server;
261 conn->client_socket = inout;