granicus.if.org Git - apache/blob - modules/http/http_core.c

   1 /* Copyright 1999-2005 The Apache Software Foundation or its licensors, as
   2  * applicable.
   3  *
   4  * Licensed under the Apache License, Version 2.0 (the "License");
   5  * you may not use this file except in compliance with the License.
   6  * You may obtain a copy of the License at
   7  *
   8  *     http://www.apache.org/licenses/LICENSE-2.0
   9  *
  10  * Unless required by applicable law or agreed to in writing, software
  11  * distributed under the License is distributed on an "AS IS" BASIS,
  12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  13  * See the License for the specific language governing permissions and
  14  * limitations under the License.
  15  */
  16
  17 #include "apr_strings.h"
  18 #include "apr_thread_proc.h"    /* for RLIMIT stuff */
  19
  20 #define APR_WANT_STRFUNC
  21 #include "apr_want.h"
  22
  23 #define CORE_PRIVATE
  24 #include "httpd.h"
  25 #include "http_config.h"
  26 #include "http_connection.h"
  27 #include "http_core.h"
  28 #include "http_protocol.h"      /* For index_of_response().  Grump. */
  29 #include "http_request.h"
  30
  31 #include "util_filter.h"
  32 #include "util_ebcdic.h"
  33 #include "ap_mpm.h"
  34 #include "scoreboard.h"
  35
  36 #include "mod_core.h"
  37
  38 /* Handles for core filters */
  39 AP_DECLARE_DATA ap_filter_rec_t *ap_http_input_filter_handle;
  40 AP_DECLARE_DATA ap_filter_rec_t *ap_http_header_filter_handle;
  41 AP_DECLARE_DATA ap_filter_rec_t *ap_chunk_filter_handle;
  42 AP_DECLARE_DATA ap_filter_rec_t *ap_byterange_filter_handle;
  43
  44 static const char *set_keep_alive_timeout(cmd_parms *cmd, void *dummy,
  45                                           const char *arg)
  46 {
  47     const char *err = ap_check_cmd_context(cmd, NOT_IN_DIR_LOC_FILE|NOT_IN_LIMIT);
  48     if (err != NULL) {
  49         return err;
  50     }
  51
  52     cmd->server->keep_alive_timeout = apr_time_from_sec(atoi(arg));
  53     return NULL;
  54 }
  55
  56 static const char *set_keep_alive(cmd_parms *cmd, void *dummy,
  57                                   const char *arg)
  58 {
  59     const char *err = ap_check_cmd_context(cmd, NOT_IN_DIR_LOC_FILE|NOT_IN_LIMIT);
  60     if (err != NULL) {
  61         return err;
  62     }
  63
  64     /* We've changed it to On/Off, but used to use numbers
  65      * so we accept anything but "Off" or "0" as "On"
  66      */
  67     if (!strcasecmp(arg, "off") || !strcmp(arg, "0")) {
  68         cmd->server->keep_alive = 0;
  69     }
  70     else {
  71         cmd->server->keep_alive = 1;
  72     }
  73     return NULL;
  74 }
  75
  76 static const char *set_keep_alive_max(cmd_parms *cmd, void *dummy,
  77                                       const char *arg)
  78 {
  79     const char *err = ap_check_cmd_context(cmd, NOT_IN_DIR_LOC_FILE|NOT_IN_LIMIT);
  80     if (err != NULL) {
  81         return err;
  82     }
  83
  84     cmd->server->keep_alive_max = atoi(arg);
  85     return NULL;
  86 }
  87
  88 static const command_rec http_cmds[] = {
  89     AP_INIT_TAKE1("KeepAliveTimeout", set_keep_alive_timeout, NULL, RSRC_CONF,
  90                   "Keep-Alive timeout duration (sec)"),
  91     AP_INIT_TAKE1("MaxKeepAliveRequests", set_keep_alive_max, NULL, RSRC_CONF,
  92                   "Maximum number of Keep-Alive requests per connection, "
  93                   "or 0 for infinite"),
  94     AP_INIT_TAKE1("KeepAlive", set_keep_alive, NULL, RSRC_CONF,
  95                   "Whether persistent connections should be On or Off"),
  96     { NULL }
  97 };
  98
  99 static const char *http_scheme(const request_rec *r)
 100 {
 101     return "http";
 102 }
 103
 104 static apr_port_t http_port(const request_rec *r)
 105 {
 106     return DEFAULT_HTTP_PORT;
 107 }
 108
 109 static int ap_process_http_async_connection(conn_rec *c)
 110 {
 111     request_rec *r;
 112     conn_state_t *cs = c->cs;
 113
 114     AP_DEBUG_ASSERT(cs->state == CONN_STATE_READ_REQUEST_LINE);
 115
 116     while (cs->state == CONN_STATE_READ_REQUEST_LINE) {
 117         ap_update_child_status(c->sbh, SERVER_BUSY_READ, NULL);
 118
 119         if ((r = ap_read_request(c))) {
 120
 121             c->keepalive = AP_CONN_UNKNOWN;
 122             /* process the request if it was read without error */
 123
 124             ap_update_child_status(c->sbh, SERVER_BUSY_WRITE, r);
 125             if (r->status == HTTP_OK) {
 126                 cs->state = CONN_STATE_HANDLER;
 127                 ap_process_async_request(r);
 128             }
 129
 130             if (ap_extended_status)
 131                 ap_increment_counts(c->sbh, r);
 132
 133             if (cs->state != CONN_STATE_WRITE_COMPLETION) {
 134                 /* Something went wrong; close the connection */
 135                 cs->state = CONN_STATE_LINGER;
 136             }
 137         }
 138         else {   /* ap_read_request failed - client may have closed */
 139             cs->state = CONN_STATE_LINGER;
 140         }
 141     }
 142
 143     return OK;
 144 }
 145
 146 static int ap_process_http_connection(conn_rec *c)
 147 {
 148     request_rec *r;
 149     conn_state_t *cs = c->cs;
 150     apr_socket_t *csd = NULL;
 151
 152     /*
 153      * Read and process each request found on our connection
 154      * until no requests are left or we decide to close.
 155      */
 156
 157     ap_update_child_status(c->sbh, SERVER_BUSY_READ, NULL);
 158     while ((r = ap_read_request(c)) != NULL) {
 159
 160         c->keepalive = AP_CONN_UNKNOWN;
 161         /* process the request if it was read without error */
 162
 163         ap_update_child_status(c->sbh, SERVER_BUSY_WRITE, r);
 164         if (r->status == HTTP_OK) {
 165             cs->state = CONN_STATE_HANDLER;
 166             ap_process_request(r);
 167         }
 168
 169         if (ap_extended_status)
 170             ap_increment_counts(c->sbh, r);
 171
 172         if (c->keepalive != AP_CONN_KEEPALIVE || c->aborted)
 173             break;
 174
 175         ap_update_child_status(c->sbh, SERVER_BUSY_KEEPALIVE, r);
 176
 177         if (ap_graceful_stop_signalled())
 178             break;
 179
 180         if (!csd) {
 181             csd = ap_get_module_config(c->conn_config, &core_module);
 182         }
 183         apr_socket_opt_set(csd, APR_INCOMPLETE_READ, 1);
 184         apr_socket_timeout_set(csd, c->base_server->keep_alive_timeout);
 185         /* Go straight to select() to wait for the next request */
 186     }
 187
 188     return OK;
 189 }
 190
 191 static int http_create_request(request_rec *r)
 192 {
 193     if (!r->main && !r->prev) {
 194         ap_add_output_filter_handle(ap_byterange_filter_handle,
 195                                     NULL, r, r->connection);
 196         ap_add_output_filter_handle(ap_content_length_filter_handle,
 197                                     NULL, r, r->connection);
 198         ap_add_output_filter_handle(ap_http_header_filter_handle,
 199                                     NULL, r, r->connection);
 200     }
 201
 202     return OK;
 203 }
 204
 205 static void register_hooks(apr_pool_t *p)
 206 {
 207     /**
 208      * If we ae using an MPM That Supports Async Connections,
 209      * use a different processing function
 210      */
 211     int async_mpm = 0;
 212     if (ap_mpm_query(AP_MPMQ_IS_ASYNC, &async_mpm) == APR_SUCCESS
 213         && async_mpm == 1) {
 214         ap_hook_process_connection(ap_process_http_async_connection, NULL,
 215                                    NULL, APR_HOOK_REALLY_LAST);
 216     }
 217     else {
 218         ap_hook_process_connection(ap_process_http_connection, NULL, NULL,
 219                                    APR_HOOK_REALLY_LAST);
 220     }
 221
 222     ap_hook_map_to_storage(ap_send_http_trace,NULL,NULL,APR_HOOK_MIDDLE);
 223     ap_hook_http_scheme(http_scheme,NULL,NULL,APR_HOOK_REALLY_LAST);
 224     ap_hook_default_port(http_port,NULL,NULL,APR_HOOK_REALLY_LAST);
 225     ap_hook_create_request(http_create_request, NULL, NULL, APR_HOOK_REALLY_LAST);
 226     ap_http_input_filter_handle =
 227         ap_register_input_filter("HTTP_IN", ap_http_filter,
 228                                  NULL, AP_FTYPE_PROTOCOL);
 229     ap_http_header_filter_handle =
 230         ap_register_output_filter("HTTP_HEADER", ap_http_header_filter,
 231                                   NULL, AP_FTYPE_PROTOCOL);
 232     ap_chunk_filter_handle =
 233         ap_register_output_filter("CHUNK", ap_http_chunk_filter,
 234                                   NULL, AP_FTYPE_TRANSCODE);
 235     ap_byterange_filter_handle =
 236         ap_register_output_filter("BYTERANGE", ap_byterange_filter,
 237                                   NULL, AP_FTYPE_PROTOCOL);
 238     ap_method_registry_init(p);
 239 }
 240
 241 module AP_MODULE_DECLARE_DATA http_module = {
 242     STANDARD20_MODULE_STUFF,
 243     NULL,                       /* create per-directory config structure */
 244     NULL,                       /* merge per-directory config structures */
 245     NULL,                       /* create per-server config structure */
 246     NULL,                       /* merge per-server config structures */
 247     http_cmds,                  /* command apr_table_t */
 248     register_hooks              /* register hooks */
 249 };