1 /* ====================================================================
2 * The Apache Software License, Version 1.1
4 * Copyright (c) 2000 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
19 * 3. The end-user documentation included with the redistribution,
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
27 * not be used to endorse or promote products derived from this
28 * software without prior written permission. For written
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
36 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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,
40 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
41 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
42 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
43 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
44 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
45 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.
152 void ap_lingering_close(conn_rec *c)
161 ap_flush_conn(c); /* just close it */
162 apr_socket_close(c->client_socket);
166 /* Close the connection, being careful to send out whatever is still
167 * in our buffers. If possible, try to avoid a hard close until the
168 * client has ACKed our FIN and/or has stopped sending us data.
171 /* Send any leftover data to the client, but never try to again */
175 apr_socket_close(c->client_socket);
179 /* Shut down the socket for write, which will send a FIN
183 if (apr_shutdown(c->client_socket, APR_SHUTDOWN_WRITE) != APR_SUCCESS ||
185 apr_socket_close(c->client_socket);
189 /* Read all data from the peer until we reach "end-of-file" (FIN
190 * from peer) or we've exceeded our overall timeout.
193 start = apr_time_now();
194 timeout = MAX_SECS_TO_LINGER * APR_USEC_PER_SEC;
196 apr_setsocketopt(c->client_socket, APR_SO_TIMEOUT, timeout);
197 nbytes = sizeof(dummybuf);
198 rc = apr_recv(c->client_socket, dummybuf, &nbytes);
199 if (rc != APR_SUCCESS || nbytes == 0) break;
201 /* how much time has elapsed? */
202 timeout = (int)((apr_time_now() - start) / APR_USEC_PER_SEC);
203 if (timeout >= MAX_SECS_TO_LINGER) break;
205 /* figure out the new timeout */
206 timeout = (int)((MAX_SECS_TO_LINGER - timeout) * APR_USEC_PER_SEC);
209 apr_socket_close(c->client_socket);
212 AP_CORE_DECLARE(void) ap_process_connection(conn_rec *c)
214 ap_update_vhost_given_ip(c);
216 ap_run_pre_connection(c);
218 ap_run_process_connection(c);
222 int ap_pre_http_connection(conn_rec *c)
224 ap_add_input_filter("HTTP_IN", NULL, NULL, c);
225 ap_add_input_filter("CORE_IN", NULL, NULL, c);
226 ap_add_output_filter("CORE", NULL, NULL, c);
230 AP_CORE_DECLARE_NONSTD(int) ap_process_http_connection(conn_rec *c)
235 * Read and process each request found on our connection
236 * until no requests are left or we decide to close.
239 ap_update_child_status(AP_CHILD_THREAD_FROM_ID(c->id), SERVER_BUSY_READ, NULL);
240 while ((r = ap_read_request(c)) != NULL) {
242 /* process the request if it was read without error */
244 ap_update_child_status(AP_CHILD_THREAD_FROM_ID(c->id), SERVER_BUSY_WRITE, NULL);
245 if (r->status == HTTP_OK)
246 ap_process_request(r);
248 if (ap_extended_status)
249 ap_increment_counts(AP_CHILD_THREAD_FROM_ID(c->id), r);
251 if (!c->keepalive || c->aborted)
254 ap_update_child_status(AP_CHILD_THREAD_FROM_ID(c->id), SERVER_BUSY_KEEPALIVE, NULL);
255 apr_pool_destroy(r->pool);
257 if (ap_graceful_stop_signalled())
264 /* Clearly some of this stuff doesn't belong in a generalised connection
265 structure, but for now...
268 conn_rec *ap_new_connection(apr_pool_t *p, server_rec *server,
269 apr_socket_t *inout, long id)
271 conn_rec *conn = (conn_rec *) apr_pcalloc(p, sizeof(conn_rec));
274 (void) ap_update_child_status(AP_CHILD_THREAD_FROM_ID(id),
275 SERVER_BUSY_READ, (request_rec *) NULL);
277 /* Got a connection structure, so initialize what fields we can
278 * (the rest are zeroed out by pcalloc).
281 conn->conn_config=ap_create_conn_config(p);
282 conn->notes = apr_table_make(p, 5);
285 if ((rv = apr_socket_addr_get(&conn->local_addr, APR_LOCAL, inout))
287 ap_log_error(APLOG_MARK, APLOG_INFO, rv, server,
288 "apr_socket_addr_get(APR_LOCAL)");
289 apr_socket_close(inout);
292 apr_sockaddr_ip_get(&conn->local_ip, conn->local_addr);
293 if ((rv = apr_socket_addr_get(&conn->remote_addr, APR_REMOTE, inout))
295 ap_log_error(APLOG_MARK, APLOG_INFO, rv, server,
296 "apr_socket_addr_get(APR_REMOTE)");
297 apr_socket_close(inout);
300 apr_sockaddr_ip_get(&conn->remote_ip, conn->remote_addr);
301 conn->base_server = server;
302 conn->client_socket = inout;