| /* 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_strings.h" |
| #include "apr_thread_proc.h" /* for RLIMIT stuff */ |
| |
| #define APR_WANT_STRFUNC |
| #include "apr_want.h" |
| |
| #include "httpd.h" |
| #include "http_config.h" |
| #include "http_connection.h" |
| #include "http_core.h" |
| #include "http_protocol.h" /* For index_of_response(). Grump. */ |
| #include "http_request.h" |
| |
| #include "util_filter.h" |
| #include "util_ebcdic.h" |
| #include "ap_mpm.h" |
| #include "scoreboard.h" |
| |
| #include "mod_core.h" |
| |
| /* Handles for core filters */ |
| AP_DECLARE_DATA ap_filter_rec_t *ap_http_input_filter_handle; |
| AP_DECLARE_DATA ap_filter_rec_t *ap_http_header_filter_handle; |
| AP_DECLARE_DATA ap_filter_rec_t *ap_chunk_filter_handle; |
| AP_DECLARE_DATA ap_filter_rec_t *ap_http_outerror_filter_handle; |
| AP_DECLARE_DATA ap_filter_rec_t *ap_byterange_filter_handle; |
| |
| AP_DECLARE_DATA const char *ap_multipart_boundary; |
| |
| /* If we are using an MPM That Supports Async Connections, |
| * use a different processing function |
| */ |
| static int async_mpm = 0; |
| |
| static const char *set_keep_alive_timeout(cmd_parms *cmd, void *dummy, |
| const char *arg) |
| { |
| apr_interval_time_t timeout; |
| const char *err = ap_check_cmd_context(cmd, NOT_IN_DIR_CONTEXT); |
| if (err != NULL) { |
| return err; |
| } |
| |
| /* Stolen from mod_proxy.c */ |
| if (ap_timeout_parameter_parse(arg, &timeout, "s") != APR_SUCCESS) |
| return "KeepAliveTimeout has wrong format"; |
| cmd->server->keep_alive_timeout = timeout; |
| |
| /* We don't want to take into account whether or not KeepAliveTimeout is |
| * set for the main server, because if no http_module directive is used |
| * for a vhost, it will inherit the http_srv_cfg from the main server. |
| * However keep_alive_timeout_set helps determine whether the vhost should |
| * use its own configured timeout or the one from the vhost declared first |
| * on the same IP:port (ie. c->base_server, and the legacy behaviour). |
| */ |
| if (cmd->server->is_virtual) { |
| cmd->server->keep_alive_timeout_set = 1; |
| } |
| return NULL; |
| } |
| |
| static const char *set_keep_alive(cmd_parms *cmd, void *dummy, |
| int arg) |
| { |
| const char *err = ap_check_cmd_context(cmd, NOT_IN_DIR_CONTEXT); |
| if (err != NULL) { |
| return err; |
| } |
| |
| cmd->server->keep_alive = arg; |
| return NULL; |
| } |
| |
| static const char *set_keep_alive_max(cmd_parms *cmd, void *dummy, |
| const char *arg) |
| { |
| const char *err = ap_check_cmd_context(cmd, NOT_IN_DIR_CONTEXT); |
| if (err != NULL) { |
| return err; |
| } |
| |
| cmd->server->keep_alive_max = atoi(arg); |
| return NULL; |
| } |
| |
| static const command_rec http_cmds[] = { |
| AP_INIT_TAKE1("KeepAliveTimeout", set_keep_alive_timeout, NULL, RSRC_CONF, |
| "Keep-Alive timeout duration (sec)"), |
| AP_INIT_TAKE1("MaxKeepAliveRequests", set_keep_alive_max, NULL, RSRC_CONF, |
| "Maximum number of Keep-Alive requests per connection, " |
| "or 0 for infinite"), |
| AP_INIT_FLAG("KeepAlive", set_keep_alive, NULL, RSRC_CONF, |
| "Whether persistent connections should be On or Off"), |
| { NULL } |
| }; |
| |
| static const char *http_scheme(const request_rec *r) |
| { |
| /* |
| * The http module shouldn't return anything other than |
| * "http" (the default) or "https". |
| */ |
| if (r->server->server_scheme && |
| (strcmp(r->server->server_scheme, "https") == 0)) |
| return "https"; |
| |
| return "http"; |
| } |
| |
| static apr_port_t http_port(const request_rec *r) |
| { |
| if (r->server->server_scheme && |
| (strcmp(r->server->server_scheme, "https") == 0)) |
| return DEFAULT_HTTPS_PORT; |
| |
| return DEFAULT_HTTP_PORT; |
| } |
| |
| static int ap_process_http_async_connection(conn_rec *c) |
| { |
| request_rec *r = NULL; |
| conn_state_t *cs = c->cs; |
| |
| AP_DEBUG_ASSERT(cs != NULL); |
| AP_DEBUG_ASSERT(cs->state == CONN_STATE_READ_REQUEST_LINE); |
| |
| if (cs->state == CONN_STATE_READ_REQUEST_LINE) { |
| ap_update_child_status_from_conn(c->sbh, SERVER_BUSY_READ, c); |
| if (ap_extended_status) { |
| ap_set_conn_count(c->sbh, r, c->keepalives); |
| } |
| if ((r = ap_read_request(c))) { |
| if (r->status == HTTP_OK) { |
| cs->state = CONN_STATE_HANDLER; |
| if (ap_extended_status) { |
| ap_set_conn_count(c->sbh, r, c->keepalives + 1); |
| } |
| ap_update_child_status(c->sbh, SERVER_BUSY_WRITE, r); |
| ap_process_async_request(r); |
| /* After the call to ap_process_request, the |
| * request pool may have been deleted. We set |
| * r=NULL here to ensure that any dereference |
| * of r that might be added later in this function |
| * will result in a segfault immediately instead |
| * of nondeterministic failures later. |
| */ |
| r = NULL; |
| } |
| |
| if (cs->state != CONN_STATE_WRITE_COMPLETION && |
| cs->state != CONN_STATE_SUSPENDED) { |
| /* Something went wrong; close the connection */ |
| cs->state = CONN_STATE_LINGER; |
| } |
| } |
| else { /* ap_read_request failed - client may have closed */ |
| cs->state = CONN_STATE_LINGER; |
| } |
| } |
| |
| return OK; |
| } |
| |
| static int ap_process_http_sync_connection(conn_rec *c) |
| { |
| request_rec *r; |
| conn_state_t *cs = c->cs; |
| apr_socket_t *csd = NULL; |
| int mpm_state = 0; |
| |
| /* |
| * Read and process each request found on our connection |
| * until no requests are left or we decide to close. |
| */ |
| |
| ap_update_child_status_from_conn(c->sbh, SERVER_BUSY_READ, c); |
| while ((r = ap_read_request(c)) != NULL) { |
| apr_interval_time_t keep_alive_timeout = r->server->keep_alive_timeout; |
| |
| /* To preserve legacy behaviour, use the keepalive timeout from the |
| * base server (first on this IP:port) when none is explicitly |
| * configured on this server. |
| */ |
| if (!r->server->keep_alive_timeout_set) { |
| keep_alive_timeout = c->base_server->keep_alive_timeout; |
| } |
| |
| if (r->status == HTTP_OK) { |
| if (cs) |
| cs->state = CONN_STATE_HANDLER; |
| ap_update_child_status(c->sbh, SERVER_BUSY_WRITE, r); |
| ap_process_request(r); |
| /* After the call to ap_process_request, the |
| * request pool will have been deleted. We set |
| * r=NULL here to ensure that any dereference |
| * of r that might be added later in this function |
| * will result in a segfault immediately instead |
| * of nondeterministic failures later. |
| */ |
| r = NULL; |
| } |
| |
| if (c->keepalive != AP_CONN_KEEPALIVE || c->aborted) |
| break; |
| |
| ap_update_child_status(c->sbh, SERVER_BUSY_KEEPALIVE, NULL); |
| |
| if (ap_mpm_query(AP_MPMQ_MPM_STATE, &mpm_state)) { |
| break; |
| } |
| |
| if (mpm_state == AP_MPMQ_STOPPING) { |
| break; |
| } |
| |
| if (!csd) { |
| csd = ap_get_conn_socket(c); |
| } |
| apr_socket_opt_set(csd, APR_INCOMPLETE_READ, 1); |
| apr_socket_timeout_set(csd, keep_alive_timeout); |
| /* Go straight to select() to wait for the next request */ |
| } |
| |
| return OK; |
| } |
| |
| static int ap_process_http_connection(conn_rec *c) |
| { |
| if (async_mpm && !c->clogging_input_filters) { |
| return ap_process_http_async_connection(c); |
| } |
| else { |
| return ap_process_http_sync_connection(c); |
| } |
| } |
| |
| static int http_create_request(request_rec *r) |
| { |
| /* FIXME: we must only add these filters if we are an HTTP request */ |
| if (!r->main && !r->prev) { |
| ap_add_output_filter_handle(ap_byterange_filter_handle, |
| NULL, r, r->connection); |
| ap_add_output_filter_handle(ap_content_length_filter_handle, |
| NULL, r, r->connection); |
| ap_add_output_filter_handle(ap_http_header_filter_handle, |
| NULL, r, r->connection); |
| ap_add_output_filter_handle(ap_http_outerror_filter_handle, |
| NULL, r, r->connection); |
| } |
| |
| return OK; |
| } |
| |
| static int http_send_options(request_rec *r) |
| { |
| if ((r->method_number == M_OPTIONS) && r->uri && (r->uri[0] == '*') && |
| (r->uri[1] == '\0')) { |
| return DONE; /* Send HTTP pong, without Allow header */ |
| } |
| return DECLINED; |
| } |
| |
| static int http_post_config(apr_pool_t *p, apr_pool_t *plog, apr_pool_t *ptemp, server_rec *s) |
| { |
| apr_uint64_t val; |
| if (ap_mpm_query(AP_MPMQ_IS_ASYNC, &async_mpm) != APR_SUCCESS) { |
| async_mpm = 0; |
| } |
| ap_random_insecure_bytes(&val, sizeof(val)); |
| ap_multipart_boundary = apr_psprintf(p, "%0" APR_UINT64_T_HEX_FMT, val); |
| |
| return OK; |
| } |
| |
| static void register_hooks(apr_pool_t *p) |
| { |
| ap_hook_post_config(http_post_config, NULL, NULL, APR_HOOK_MIDDLE); |
| ap_hook_process_connection(ap_process_http_connection, NULL, NULL, |
| APR_HOOK_REALLY_LAST); |
| ap_hook_map_to_storage(ap_send_http_trace,NULL,NULL,APR_HOOK_MIDDLE); |
| ap_hook_map_to_storage(http_send_options,NULL,NULL,APR_HOOK_MIDDLE); |
| ap_hook_http_scheme(http_scheme,NULL,NULL,APR_HOOK_REALLY_LAST); |
| ap_hook_default_port(http_port,NULL,NULL,APR_HOOK_REALLY_LAST); |
| ap_hook_create_request(http_create_request, NULL, NULL, APR_HOOK_REALLY_LAST); |
| ap_http_input_filter_handle = |
| ap_register_input_filter("HTTP_IN", ap_http_filter, |
| NULL, AP_FTYPE_PROTOCOL); |
| ap_http_header_filter_handle = |
| ap_register_output_filter("HTTP_HEADER", ap_http_header_filter, |
| NULL, AP_FTYPE_PROTOCOL); |
| ap_chunk_filter_handle = |
| ap_register_output_filter("CHUNK", ap_http_chunk_filter, |
| NULL, AP_FTYPE_TRANSCODE); |
| ap_http_outerror_filter_handle = |
| ap_register_output_filter("HTTP_OUTERROR", ap_http_outerror_filter, |
| NULL, AP_FTYPE_PROTOCOL); |
| ap_byterange_filter_handle = |
| ap_register_output_filter("BYTERANGE", ap_byterange_filter, |
| NULL, AP_FTYPE_PROTOCOL); |
| ap_method_registry_init(p); |
| } |
| |
| AP_DECLARE_MODULE(http) = { |
| STANDARD20_MODULE_STUFF, |
| NULL, /* create per-directory config structure */ |
| NULL, /* merge per-directory config structures */ |
| NULL, /* create per-server config structure */ |
| NULL, /* merge per-server config structures */ |
| http_cmds, /* command apr_table_t */ |
| register_hooks /* register hooks */ |
| }; |
