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DEFINITIONS
This source file includes following definitions.
- set_keep_alive_timeout
- set_keep_alive
- set_keep_alive_max
- http_scheme
- http_port
- ap_process_http_async_connection
- ap_process_http_connection
- http_create_request
- http_send_options
- register_hooks
/* 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"
#define CORE_PRIVATE
#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;
static int ap_process_http_connection(conn_rec *c);
static const char *set_keep_alive_timeout(cmd_parms *cmd, void *dummy,
const char *arg)
{
const char *err = ap_check_cmd_context(cmd, NOT_IN_DIR_LOC_FILE|NOT_IN_LIMIT);
if (err != NULL) {
return err;
}
cmd->server->keep_alive_timeout = apr_time_from_sec(atoi(arg));
return NULL;
}
static const char *set_keep_alive(cmd_parms *cmd, void *dummy,
const char *arg)
{
const char *err = ap_check_cmd_context(cmd, NOT_IN_DIR_LOC_FILE|NOT_IN_LIMIT);
if (err != NULL) {
return err;
}
/* We've changed it to On/Off, but used to use numbers
* so we accept anything but "Off" or "0" as "On"
*/
if (!strcasecmp(arg, "off") || !strcmp(arg, "0")) {
cmd->server->keep_alive = 0;
}
else {
cmd->server->keep_alive = 1;
}
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_LOC_FILE|NOT_IN_LIMIT);
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_TAKE1("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;
conn_state_t *cs = c->cs;
if (c->clogging_input_filters) {
return ap_process_http_connection(c);
}
AP_DEBUG_ASSERT(cs->state == CONN_STATE_READ_REQUEST_LINE);
while (cs->state == CONN_STATE_READ_REQUEST_LINE) {
ap_update_child_status(c->sbh, SERVER_BUSY_READ, NULL);
if ((r = ap_read_request(c))) {
c->keepalive = AP_CONN_UNKNOWN;
/* process the request if it was read without error */
ap_update_child_status(c->sbh, SERVER_BUSY_WRITE, r);
if (r->status == HTTP_OK)
ap_process_request(r);
if (ap_extended_status)
ap_increment_counts(c->sbh, r);
if (c->keepalive != AP_CONN_KEEPALIVE || c->aborted
|| ap_graceful_stop_signalled()) {
cs->state = CONN_STATE_LINGER;
}
else if (!c->data_in_input_filters) {
cs->state = CONN_STATE_CHECK_REQUEST_LINE_READABLE;
}
/* else we are pipelining. Stay in READ_REQUEST_LINE state
* and stay in the loop
*/
apr_pool_destroy(r->pool);
}
else { /* ap_read_request failed - client may have closed */
cs->state = CONN_STATE_LINGER;
}
}
return OK;
}
static int ap_process_http_connection(conn_rec *c)
{
request_rec *r;
apr_socket_t *csd = NULL;
/*
* Read and process each request found on our connection
* until no requests are left or we decide to close.
*/
ap_update_child_status(c->sbh, SERVER_BUSY_READ, NULL);
while ((r = ap_read_request(c)) != NULL) {
c->keepalive = AP_CONN_UNKNOWN;
/* process the request if it was read without error */
ap_update_child_status(c->sbh, SERVER_BUSY_WRITE, r);
if (r->status == HTTP_OK)
ap_process_request(r);
if (ap_extended_status)
ap_increment_counts(c->sbh, r);
if (c->keepalive != AP_CONN_KEEPALIVE || c->aborted)
break;
ap_update_child_status(c->sbh, SERVER_BUSY_KEEPALIVE, r);
apr_pool_destroy(r->pool);
if (ap_graceful_stop_signalled())
break;
if (!csd) {
csd = ap_get_module_config(c->conn_config, &core_module);
}
apr_socket_opt_set(csd, APR_INCOMPLETE_READ, 1);
apr_socket_timeout_set(csd, c->base_server->keep_alive_timeout);
/* Go straight to select() to wait for the next request */
}
return OK;
}
static int http_create_request(request_rec *r)
{
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 void register_hooks(apr_pool_t *p)
{
/**
* If we ae using an MPM That Supports Async Connections,
* use a different processing function
*/
int async_mpm = 0;
if (ap_mpm_query(AP_MPMQ_IS_ASYNC, &async_mpm) == APR_SUCCESS
&& async_mpm == 1) {
ap_hook_process_connection(ap_process_http_async_connection, NULL,
NULL, APR_HOOK_REALLY_LAST);
}
else {
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);
}
module AP_MODULE_DECLARE_DATA http_module = {
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 */
};