/* ==================================================================== * The Apache Software License, Version 1.1 * * Copyright (c) 2000-2001 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. 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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 * . * * 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(install_transport_filters) 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_FIRST(int, install_transport_filters, (conn_rec *c, apr_socket_t *csd),(c, csd), DECLINED) AP_IMPLEMENT_HOOK_RUN_ALL(int,pre_connection,(conn_rec *c),(c),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); for (;;) { 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, apr_socket_t *csd) { ap_update_vhost_given_ip(c); ap_run_install_transport_filters(c, csd); ap_run_pre_connection(c); if (!c->aborted) { ap_run_process_connection(c); } }