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/* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership.
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* The ASF licenses this file to You under the Apache License, Version 2.0
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* (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.apache.org/licenses/LICENSE-2.0
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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* http_request.c: functions to get and process requests
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* Thoroughly revamped by rst for Apache. NB this file reads
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* best from the bottom up.
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#include "apr_strings.h"
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#include "apr_file_io.h"
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#include "apr_fnmatch.h"
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#define APR_WANT_STRFUNC
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#include "ap_config.h"
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#include "http_config.h"
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#include "http_request.h"
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#include "http_core.h"
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#include "http_protocol.h"
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#include "http_main.h"
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#include "util_filter.h"
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#include "util_charset.h"
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#include "scoreboard.h"
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/*****************************************************************
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* Mainline request processing...
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/* XXX A cleaner and faster way to do this might be to pass the request_rec
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* down the filter chain as a parameter. It would need to change for
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* subrequest vs. main request filters; perhaps the subrequest filter could
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static void update_r_in_filters(ap_filter_t *f,
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AP_DECLARE(void) ap_die(int type, request_rec *r)
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int error_index = ap_index_of_response(type);
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char *custom_response = ap_response_code_string(r, error_index);
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int recursive_error = 0;
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request_rec *r_1st_err = r;
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if (type == AP_FILTER_ERROR) {
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ap_finalize_request_protocol(r);
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* The following takes care of Apache redirects to custom response URLs
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* Note that if we are already dealing with the response to some other
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* error condition, we just report on the original error, and give up on
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* any attempt to handle the other thing "intelligently"...
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if (r->status != HTTP_OK) {
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recursive_error = type;
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while (r_1st_err->prev && (r_1st_err->prev->status != HTTP_OK))
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r_1st_err = r_1st_err->prev; /* Get back to original error */
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if (r_1st_err != r) {
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/* The recursive error was caused by an ErrorDocument specifying
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* an internal redirect to a bad URI. ap_internal_redirect has
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* changed the filter chains to point to the ErrorDocument's
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* request_rec. Back out those changes so we can safely use the
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* original failing request_rec to send the canned error message.
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* ap_send_error_response gets rid of existing resource filters
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* on the output side, so we can skip those.
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update_r_in_filters(r_1st_err->proto_output_filters, r, r_1st_err);
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update_r_in_filters(r_1st_err->input_filters, r, r_1st_err);
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custom_response = NULL; /* Do NOT retry the custom thing! */
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* This test is done here so that none of the auth modules needs to know
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* about proxy authentication. They treat it like normal auth, and then
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* we tweak the status.
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if (HTTP_UNAUTHORIZED == r->status && PROXYREQ_PROXY == r->proxyreq) {
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r->status = HTTP_PROXY_AUTHENTICATION_REQUIRED;
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/* If we don't want to keep the connection, make sure we mark that the
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* connection is not eligible for keepalive. If we want to keep the
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* connection, be sure that the request body (if any) has been read.
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if (ap_status_drops_connection(r->status)) {
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r->connection->keepalive = AP_CONN_CLOSE;
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* Two types of custom redirects --- plain text, and URLs. Plain text has
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* a leading '"', so the URL code, here, is triggered on its absence
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if (custom_response && custom_response[0] != '"') {
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if (ap_is_url(custom_response)) {
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* The URL isn't local, so lets drop through the rest of this
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* apache code, and continue with the usual REDIRECT handler.
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* But note that the client will ultimately see the wrong
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r->status = HTTP_MOVED_TEMPORARILY;
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apr_table_setn(r->headers_out, "Location", custom_response);
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else if (custom_response[0] == '/') {
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const char *error_notes;
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r->no_local_copy = 1; /* Do NOT send HTTP_NOT_MODIFIED for
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* error documents! */
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* This redirect needs to be a GET no matter what the original
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apr_table_setn(r->subprocess_env, "REQUEST_METHOD", r->method);
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* Provide a special method for modules to communicate
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* more informative (than the plain canned) messages to us.
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* Propagate them to ErrorDocuments via the ERROR_NOTES variable:
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if ((error_notes = apr_table_get(r->notes,
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"error-notes")) != NULL) {
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apr_table_setn(r->subprocess_env, "ERROR_NOTES", error_notes);
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r->method = apr_pstrdup(r->pool, "GET");
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r->method_number = M_GET;
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ap_internal_redirect(custom_response, r);
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* Dumb user has given us a bad url to redirect to --- fake up
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* dying with a recursive server error...
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recursive_error = HTTP_INTERNAL_SERVER_ERROR;
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ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r,
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"Invalid error redirection directive: %s",
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ap_send_error_response(r_1st_err, recursive_error);
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static void check_pipeline_flush(request_rec *r)
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apr_bucket_brigade *bb;
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conn_rec *c = r->connection;
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/* ### if would be nice if we could PEEK without a brigade. that would
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### allow us to defer creation of the brigade to when we actually
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### need to send a FLUSH. */
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bb = apr_brigade_create(r->pool, c->bucket_alloc);
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/* Flush the filter contents if:
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* 1) the connection will be closed
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* 2) there isn't a request ready to be read
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/* ### shouldn't this read from the connection input filters? */
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/* ### is zero correct? that means "read one line" */
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if (r->connection->keepalive != AP_CONN_CLOSE) {
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if (ap_get_brigade(r->input_filters, bb, AP_MODE_EATCRLF,
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APR_NONBLOCK_READ, 0) != APR_SUCCESS) {
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c->data_in_input_filters = 0; /* we got APR_EOF or an error */
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c->data_in_input_filters = 1;
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return; /* don't flush */
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e = apr_bucket_flush_create(c->bucket_alloc);
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/* We just send directly to the connection based filters. At
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* this point, we know that we have seen all of the data
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* (request finalization sent an EOS bucket, which empties all
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* of the request filters). We just want to flush the buckets
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* if something hasn't been sent to the network yet.
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APR_BRIGADE_INSERT_HEAD(bb, e);
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ap_pass_brigade(r->connection->output_filters, bb);
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void ap_process_request(request_rec *r)
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/* Give quick handlers a shot at serving the request on the fast
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* path, bypassing all of the other Apache hooks.
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* This hook was added to enable serving files out of a URI keyed
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* content cache ( e.g., Mike Abbott's Quick Shortcut Cache,
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* described here: http://oss.sgi.com/projects/apache/mod_qsc.html )
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* It may have other uses as well, such as routing requests directly to
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* content handlers that have the ability to grok HTTP and do their
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* own access checking, etc (e.g. servlet engines).
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* Use this hook with extreme care and only if you know what you are
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if (ap_extended_status)
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ap_time_process_request(r->connection->sbh, START_PREQUEST);
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access_status = ap_run_quick_handler(r, 0); /* Not a look-up request */
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if (access_status == DECLINED) {
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access_status = ap_process_request_internal(r);
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if (access_status == OK) {
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access_status = ap_invoke_handler(r);
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if (access_status == DONE) {
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/* e.g., something not in storage like TRACE */
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if (access_status == OK) {
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ap_finalize_request_protocol(r);
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ap_die(access_status, r);
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* We want to flush the last packet if this isn't a pipelining connection
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* *before* we start into logging. Suppose that the logging causes a DNS
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* lookup to occur, which may have a high latency. If we hold off on
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* this packet, then it'll appear like the link is stalled when really
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* it's the application that's stalled.
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check_pipeline_flush(r);
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ap_update_child_status(r->connection->sbh, SERVER_BUSY_LOG, r);
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ap_run_log_transaction(r);
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if (ap_extended_status)
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ap_time_process_request(r->connection->sbh, STOP_PREQUEST);
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static apr_table_t *rename_original_env(apr_pool_t *p, apr_table_t *t)
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const apr_array_header_t *env_arr = apr_table_elts(t);
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const apr_table_entry_t *elts = (const apr_table_entry_t *) env_arr->elts;
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apr_table_t *new = apr_table_make(p, env_arr->nalloc);
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for (i = 0; i < env_arr->nelts; ++i) {
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apr_table_setn(new, apr_pstrcat(p, "REDIRECT_", elts[i].key, NULL),
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static request_rec *internal_internal_redirect(const char *new_uri,
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if (ap_is_recursion_limit_exceeded(r)) {
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ap_die(HTTP_INTERNAL_SERVER_ERROR, r);
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new = (request_rec *) apr_pcalloc(r->pool, sizeof(request_rec));
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new->connection = r->connection;
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new->server = r->server;
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* A whole lot of this really ought to be shared with http_protocol.c...
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* another missing cleanup. It's particularly inappropriate to be
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* setting header_only, etc., here.
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new->method = r->method;
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new->method_number = r->method_number;
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new->allowed_methods = ap_make_method_list(new->pool, 2);
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ap_parse_uri(new, new_uri);
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new->request_config = ap_create_request_config(r->pool);
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new->per_dir_config = r->server->lookup_defaults;
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/* Must have prev and next pointers set before calling create_request
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ap_run_create_request(new);
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/* Inherit the rest of the protocol info... */
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new->the_request = r->the_request;
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new->allowed = r->allowed;
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new->status = r->status;
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new->assbackwards = r->assbackwards;
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new->header_only = r->header_only;
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new->protocol = r->protocol;
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new->proto_num = r->proto_num;
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new->hostname = r->hostname;
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new->request_time = r->request_time;
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new->headers_in = r->headers_in;
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new->headers_out = apr_table_make(r->pool, 12);
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new->err_headers_out = r->err_headers_out;
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new->subprocess_env = rename_original_env(r->pool, r->subprocess_env);
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new->notes = apr_table_make(r->pool, 5);
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new->allowed_methods = ap_make_method_list(new->pool, 2);
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new->htaccess = r->htaccess;
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new->no_cache = r->no_cache;
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new->expecting_100 = r->expecting_100;
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new->no_local_copy = r->no_local_copy;
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new->read_length = r->read_length; /* We can only read it once */
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new->vlist_validator = r->vlist_validator;
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new->proto_output_filters = r->proto_output_filters;
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new->proto_input_filters = r->proto_input_filters;
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new->output_filters = new->proto_output_filters;
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new->input_filters = new->proto_input_filters;
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/* Add back the subrequest filter, which we lost when
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* we set output_filters to include only the protocol
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* output filters from the original request.
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ap_add_output_filter_handle(ap_subreq_core_filter_handle,
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NULL, new, new->connection);
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update_r_in_filters(new->input_filters, r, new);
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update_r_in_filters(new->output_filters, r, new);
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apr_table_setn(new->subprocess_env, "REDIRECT_STATUS",
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apr_itoa(r->pool, r->status));
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* XXX: hmm. This is because mod_setenvif and mod_unique_id really need
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* to do their thing on internal redirects as well. Perhaps this is a
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if ((access_status = ap_run_post_read_request(new))) {
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ap_die(access_status, new);
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/* XXX: Is this function is so bogus and fragile that we deep-6 it? */
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AP_DECLARE(void) ap_internal_fast_redirect(request_rec *rr, request_rec *r)
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/* We need to tell POOL_DEBUG that we're guaranteeing that rr->pool
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* will exist as long as r->pool. Otherwise we run into troubles because
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* some values in this request will be allocated in r->pool, and others in
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apr_pool_join(r->pool, rr->pool);
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r->proxyreq = rr->proxyreq;
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r->no_cache = (r->no_cache && rr->no_cache);
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r->no_local_copy = (r->no_local_copy && rr->no_local_copy);
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r->mtime = rr->mtime;
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r->filename = rr->filename;
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r->canonical_filename = rr->canonical_filename;
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r->path_info = rr->path_info;
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r->finfo = rr->finfo;
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r->handler = rr->handler;
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ap_set_content_type(r, rr->content_type);
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r->content_encoding = rr->content_encoding;
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r->content_languages = rr->content_languages;
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r->per_dir_config = rr->per_dir_config;
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/* copy output headers from subrequest, but leave negotiation headers */
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r->notes = apr_table_overlay(r->pool, rr->notes, r->notes);
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r->headers_out = apr_table_overlay(r->pool, rr->headers_out,
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r->err_headers_out = apr_table_overlay(r->pool, rr->err_headers_out,
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r->subprocess_env = apr_table_overlay(r->pool, rr->subprocess_env,
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r->output_filters = rr->output_filters;
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r->input_filters = rr->input_filters;
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ap_add_output_filter_handle(ap_subreq_core_filter_handle,
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NULL, r, r->connection);
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else if (r->output_filters->frec == ap_subreq_core_filter_handle) {
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ap_remove_output_filter(r->output_filters);
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r->output_filters = r->output_filters->next;
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/* If any filters pointed at the now-defunct rr, we must point them
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* at our "new" instance of r. In particular, some of rr's structures
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* will now be bogus (say rr->headers_out). If a filter tried to modify
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* their f->r structure when it is pointing to rr, the real request_rec
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* will not get updated. Fix that here.
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update_r_in_filters(r->input_filters, rr, r);
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update_r_in_filters(r->output_filters, rr, r);
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AP_DECLARE(void) ap_internal_redirect(const char *new_uri, request_rec *r)
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request_rec *new = internal_internal_redirect(new_uri, r);
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/* ap_die was already called, if an error occured */
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access_status = ap_run_quick_handler(new, 0); /* Not a look-up request */
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if (access_status == DECLINED) {
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access_status = ap_process_request_internal(new);
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if (access_status == OK) {
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access_status = ap_invoke_handler(new);
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if (access_status == OK) {
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ap_finalize_request_protocol(new);
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ap_die(access_status, new);
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/* This function is designed for things like actions or CGI scripts, when
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* using AddHandler, and you want to preserve the content type across
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* an internal redirect.
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AP_DECLARE(void) ap_internal_redirect_handler(const char *new_uri, request_rec *r)
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request_rec *new = internal_internal_redirect(new_uri, r);
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/* ap_die was already called, if an error occured */
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ap_set_content_type(new, r->content_type);
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access_status = ap_process_request_internal(new);
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if (access_status == OK) {
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if ((access_status = ap_invoke_handler(new)) != 0) {
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ap_die(access_status, new);
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ap_finalize_request_protocol(new);
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ap_die(access_status, new);
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AP_DECLARE(void) ap_allow_methods(request_rec *r, int reset, ...)
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* Get rid of any current settings if requested; not just the
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* well-known methods but any extensions as well.
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ap_clear_method_list(r->allowed_methods);
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va_start(methods, reset);
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while ((method = va_arg(methods, const char *)) != NULL) {
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ap_method_list_add(r->allowed_methods, method);
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AP_DECLARE(void) ap_allow_standard_methods(request_rec *r, int reset, ...)
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* Get rid of any current settings if requested; not just the
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* well-known methods but any extensions as well.
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ap_clear_method_list(r->allowed_methods);
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va_start(methods, reset);
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while ((method = va_arg(methods, int)) != -1) {
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mask |= (AP_METHOD_BIT << method);
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r->allowed_methods->method_mask |= mask;
added
removed
modules/http/http_request.c
