diff options
Diffstat (limited to 'rubbos/app/httpd-2.0.64/server/connection.c')
| -rw-r--r-- | rubbos/app/httpd-2.0.64/server/connection.c | 179 |
1 files changed, 179 insertions, 0 deletions
diff --git a/rubbos/app/httpd-2.0.64/server/connection.c b/rubbos/app/httpd-2.0.64/server/connection.c new file mode 100644 index 00000000..52b8908f --- /dev/null +++ b/rubbos/app/httpd-2.0.64/server/connection.c @@ -0,0 +1,179 @@ +/* Licensed to the Apache Software Foundation (ASF) under one or more + * contributor license agreements. See the NOTICE file distributed with + * this work for additional information regarding copyright ownership. + * The ASF licenses this file to You under the Apache License, Version 2.0 + * (the "License"); you may not use this file except in compliance with + * the License. You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + */ + +#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, apr_bucket_alloc_t *alloc), + (p, server, csd, conn_id, sbh, alloc), 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 + +AP_CORE_DECLARE(void) ap_flush_conn(conn_rec *c) +{ + apr_bucket_brigade *bb; + apr_bucket *b; + + bb = apr_brigade_create(c->pool, c->bucket_alloc); + + /* FLUSH bucket */ + b = apr_bucket_flush_create(c->bucket_alloc); + APR_BRIGADE_INSERT_TAIL(bb, b); + + /* End Of Connection bucket */ + b = ap_bucket_eoc_create(c->bucket_alloc); + 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 = apr_time_from_sec(SECONDS_TO_LINGER); + apr_socket_timeout_set(csd, timeout); + apr_socket_opt_set(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) +{ + int rc; + ap_update_vhost_given_ip(c); + + rc = ap_run_pre_connection(c, csd); + if (rc != OK && rc != DONE) { + c->aborted = 1; + } + + if (!c->aborted) { + ap_run_process_connection(c); + } +} + |