| /* ==================================================================== |
| * The Apache Software License, Version 1.1 |
| * |
| * Copyright (c) 2000-2002 The Apache Software Foundation. All rights |
| * reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions |
| * are met: |
| * |
| * 1. Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * |
| * 2. Redistributions in binary form must reproduce the above copyright |
| * notice, this list of conditions and the following disclaimer in |
| * the documentation and/or other materials provided with the |
| * distribution. |
| * |
| * 3. The end-user documentation included with the redistribution, |
| * if any, must include the following acknowledgment: |
| * "This product includes software developed by the |
| * Apache Software Foundation (http://www.apache.org/)." |
| * Alternately, this acknowledgment may appear in the software itself, |
| * if and wherever such third-party acknowledgments normally appear. |
| * |
| * 4. The names "Apache" and "Apache Software Foundation" must |
| * not be used to endorse or promote products derived from this |
| * software without prior written permission. For written |
| * permission, please contact apache@apache.org. |
| * |
| * 5. Products derived from this software may not be called "Apache", |
| * nor may "Apache" appear in their name, without prior written |
| * permission of the Apache Software Foundation. |
| * |
| * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED |
| * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
| * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE |
| * DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR |
| * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
| * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
| * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF |
| * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND |
| * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, |
| * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT |
| * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
| * SUCH DAMAGE. |
| * ==================================================================== |
| * |
| * This software consists of voluntary contributions made by many |
| * individuals on behalf of the Apache Software Foundation. For more |
| * information on the Apache Software Foundation, please see |
| * <http://www.apache.org/>. |
| * |
| * Portions of this software are based upon public domain software |
| * originally written at the National Center for Supercomputing Applications, |
| * University of Illinois, Urbana-Champaign. |
| */ |
| |
| #include "apr.h" |
| #include "apr_strings.h" |
| |
| #define CORE_PRIVATE |
| #include "ap_config.h" |
| #include "httpd.h" |
| #include "http_connection.h" |
| #include "http_request.h" |
| #include "http_protocol.h" |
| #include "ap_mpm.h" |
| #include "mpm_default.h" |
| #include "http_config.h" |
| #include "http_core.h" |
| #include "http_vhost.h" |
| #include "scoreboard.h" |
| #include "http_log.h" |
| #include "util_filter.h" |
| |
| APR_HOOK_STRUCT( |
| APR_HOOK_LINK(create_connection) |
| APR_HOOK_LINK(process_connection) |
| APR_HOOK_LINK(pre_connection) |
| ) |
| AP_IMPLEMENT_HOOK_RUN_FIRST(conn_rec *,create_connection, |
| (apr_pool_t *p, server_rec *server, apr_socket_t *csd, long conn_id, void *sbh), |
| (p, server, csd, conn_id, sbh), NULL) |
| AP_IMPLEMENT_HOOK_RUN_FIRST(int,process_connection,(conn_rec *c),(c),DECLINED) |
| AP_IMPLEMENT_HOOK_RUN_ALL(int,pre_connection,(conn_rec *c, void *csd),(c, csd),OK,DECLINED) |
| /* |
| * More machine-dependent networking gooo... on some systems, |
| * you've got to be *really* sure that all the packets are acknowledged |
| * before closing the connection, since the client will not be able |
| * to see the last response if their TCP buffer is flushed by a RST |
| * packet from us, which is what the server's TCP stack will send |
| * if it receives any request data after closing the connection. |
| * |
| * In an ideal world, this function would be accomplished by simply |
| * setting the socket option SO_LINGER and handling it within the |
| * server's TCP stack while the process continues on to the next request. |
| * Unfortunately, it seems that most (if not all) operating systems |
| * block the server process on close() when SO_LINGER is used. |
| * For those that don't, see USE_SO_LINGER below. For the rest, |
| * we have created a home-brew lingering_close. |
| * |
| * Many operating systems tend to block, puke, or otherwise mishandle |
| * calls to shutdown only half of the connection. You should define |
| * NO_LINGCLOSE in ap_config.h if such is the case for your system. |
| */ |
| #ifndef MAX_SECS_TO_LINGER |
| #define MAX_SECS_TO_LINGER 30 |
| #endif |
| |
| #ifdef USE_SO_LINGER |
| #define NO_LINGCLOSE /* The two lingering options are exclusive */ |
| |
| static void sock_enable_linger(int s) |
| { |
| struct linger li; |
| |
| li.l_onoff = 1; |
| li.l_linger = MAX_SECS_TO_LINGER; |
| |
| if (setsockopt(s, SOL_SOCKET, SO_LINGER, |
| (char *)&li, sizeof(struct linger)) < 0) { |
| ap_log_error(APLOG_MARK, APLOG_WARNING, errno, server_conf, |
| "setsockopt: (SO_LINGER)"); |
| /* not a fatal error */ |
| } |
| } |
| |
| #else |
| #define sock_enable_linger(s) /* NOOP */ |
| #endif /* USE_SO_LINGER */ |
| |
| AP_CORE_DECLARE(void) ap_flush_conn(conn_rec *c) |
| { |
| apr_bucket_brigade *bb; |
| apr_bucket *b; |
| |
| bb = apr_brigade_create(c->pool); |
| b = apr_bucket_flush_create(); |
| APR_BRIGADE_INSERT_TAIL(bb, b); |
| ap_pass_brigade(c->output_filters, bb); |
| } |
| |
| /* we now proceed to read from the client until we get EOF, or until |
| * MAX_SECS_TO_LINGER has passed. the reasons for doing this are |
| * documented in a draft: |
| * |
| * http://www.ics.uci.edu/pub/ietf/http/draft-ietf-http-connection-00.txt |
| * |
| * in a nutshell -- if we don't make this effort we risk causing |
| * TCP RST packets to be sent which can tear down a connection before |
| * all the response data has been sent to the client. |
| */ |
| #define SECONDS_TO_LINGER 2 |
| AP_DECLARE(void) ap_lingering_close(conn_rec *c) |
| { |
| char dummybuf[512]; |
| apr_size_t nbytes = sizeof(dummybuf); |
| apr_status_t rc; |
| apr_int32_t timeout; |
| apr_int32_t total_linger_time = 0; |
| apr_socket_t *csd = ap_get_module_config(c->conn_config, &core_module); |
| |
| if (!csd) { |
| return; |
| } |
| |
| ap_update_child_status(c->sbh, SERVER_CLOSING, NULL); |
| |
| #ifdef NO_LINGCLOSE |
| ap_flush_conn(c); /* just close it */ |
| apr_socket_close(csd); |
| return; |
| #endif |
| |
| /* Close the connection, being careful to send out whatever is still |
| * in our buffers. If possible, try to avoid a hard close until the |
| * client has ACKed our FIN and/or has stopped sending us data. |
| */ |
| |
| /* Send any leftover data to the client, but never try to again */ |
| ap_flush_conn(c); |
| |
| if (c->aborted) { |
| apr_socket_close(csd); |
| return; |
| } |
| |
| /* Shut down the socket for write, which will send a FIN |
| * to the peer. |
| */ |
| if (apr_shutdown(csd, APR_SHUTDOWN_WRITE) != APR_SUCCESS |
| || c->aborted) { |
| apr_socket_close(csd); |
| return; |
| } |
| |
| /* Read all data from the peer until we reach "end-of-file" (FIN |
| * from peer) or we've exceeded our overall timeout. If the client does |
| * not send us bytes within 2 seconds (a value pulled from Apache 1.3 |
| * which seems to work well), close the connection. |
| */ |
| timeout = SECONDS_TO_LINGER * APR_USEC_PER_SEC; |
| apr_setsocketopt(csd, APR_SO_TIMEOUT, timeout); |
| apr_setsocketopt(csd, APR_INCOMPLETE_READ, 1); |
| while (1) { |
| nbytes = sizeof(dummybuf); |
| rc = apr_recv(csd, dummybuf, &nbytes); |
| if (rc != APR_SUCCESS || nbytes == 0) |
| break; |
| |
| total_linger_time += SECONDS_TO_LINGER; |
| if (total_linger_time >= MAX_SECS_TO_LINGER) { |
| break; |
| } |
| } |
| |
| apr_socket_close(csd); |
| return; |
| } |
| |
| AP_CORE_DECLARE(void) ap_process_connection(conn_rec *c, void *csd) |
| { |
| ap_update_vhost_given_ip(c); |
| |
| ap_run_pre_connection(c, csd); |
| |
| if (!c->aborted) { |
| ap_run_process_connection(c); |
| } |
| } |
| |