--- /dev/null
+/* 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.
+ */
+
+/*
+ * http_request.c: functions to get and process requests
+ *
+ * Rob McCool 3/21/93
+ *
+ * Thoroughly revamped by rst for Apache. NB this file reads
+ * best from the bottom up.
+ *
+ */
+
+#include "apr_strings.h"
+#include "apr_file_io.h"
+#include "apr_fnmatch.h"
+
+#define APR_WANT_STRFUNC
+#include "apr_want.h"
+
+#define CORE_PRIVATE
+#include "ap_config.h"
+#include "httpd.h"
+#include "http_config.h"
+#include "http_request.h"
+#include "http_core.h"
+#include "http_protocol.h"
+#include "http_log.h"
+#include "http_main.h"
+#include "util_filter.h"
+#include "util_charset.h"
+
+#include "mod_core.h"
+#include "scoreboard.h"
+
+#if APR_HAVE_STDARG_H
+#include <stdarg.h>
+#endif
+
+/*****************************************************************
+ *
+ * Mainline request processing...
+ */
+
+/* XXX A cleaner and faster way to do this might be to pass the request_rec
+ * down the filter chain as a parameter. It would need to change for
+ * subrequest vs. main request filters; perhaps the subrequest filter could
+ * make the switch.
+ */
+static void update_r_in_filters(ap_filter_t *f,
+ request_rec *from,
+ request_rec *to)
+{
+ while (f) {
+ if (f->r == from) {
+ f->r = to;
+ }
+ f = f->next;
+ }
+}
+
+AP_DECLARE(void) ap_die(int type, request_rec *r)
+{
+ int error_index = ap_index_of_response(type);
+ char *custom_response = ap_response_code_string(r, error_index);
+ int recursive_error = 0;
+ request_rec *r_1st_err = r;
+
+ if (type == AP_FILTER_ERROR) {
+ return;
+ }
+
+ if (type == DONE) {
+ ap_finalize_request_protocol(r);
+ return;
+ }
+
+ /*
+ * The following takes care of Apache redirects to custom response URLs
+ * Note that if we are already dealing with the response to some other
+ * error condition, we just report on the original error, and give up on
+ * any attempt to handle the other thing "intelligently"...
+ */
+ if (r->status != HTTP_OK) {
+ recursive_error = type;
+
+ while (r_1st_err->prev && (r_1st_err->prev->status != HTTP_OK))
+ r_1st_err = r_1st_err->prev; /* Get back to original error */
+
+ if (r_1st_err != r) {
+ /* The recursive error was caused by an ErrorDocument specifying
+ * an internal redirect to a bad URI. ap_internal_redirect has
+ * changed the filter chains to point to the ErrorDocument's
+ * request_rec. Back out those changes so we can safely use the
+ * original failing request_rec to send the canned error message.
+ *
+ * ap_send_error_response gets rid of existing resource filters
+ * on the output side, so we can skip those.
+ */
+ update_r_in_filters(r_1st_err->proto_output_filters, r, r_1st_err);
+ update_r_in_filters(r_1st_err->input_filters, r, r_1st_err);
+ }
+
+ custom_response = NULL; /* Do NOT retry the custom thing! */
+ }
+
+ r->status = type;
+
+ /*
+ * This test is done here so that none of the auth modules needs to know
+ * about proxy authentication. They treat it like normal auth, and then
+ * we tweak the status.
+ */
+ if (HTTP_UNAUTHORIZED == r->status && PROXYREQ_PROXY == r->proxyreq) {
+ r->status = HTTP_PROXY_AUTHENTICATION_REQUIRED;
+ }
+
+ /* If we don't want to keep the connection, make sure we mark that the
+ * connection is not eligible for keepalive. If we want to keep the
+ * connection, be sure that the request body (if any) has been read.
+ */
+ if (ap_status_drops_connection(r->status)) {
+ r->connection->keepalive = AP_CONN_CLOSE;
+ }
+
+ /*
+ * Two types of custom redirects --- plain text, and URLs. Plain text has
+ * a leading '"', so the URL code, here, is triggered on its absence
+ */
+
+ if (custom_response && custom_response[0] != '"') {
+
+ if (ap_is_url(custom_response)) {
+ /*
+ * The URL isn't local, so lets drop through the rest of this
+ * apache code, and continue with the usual REDIRECT handler.
+ * But note that the client will ultimately see the wrong
+ * status...
+ */
+ r->status = HTTP_MOVED_TEMPORARILY;
+ apr_table_setn(r->headers_out, "Location", custom_response);
+ }
+ else if (custom_response[0] == '/') {
+ const char *error_notes;
+ r->no_local_copy = 1; /* Do NOT send HTTP_NOT_MODIFIED for
+ * error documents! */
+ /*
+ * This redirect needs to be a GET no matter what the original
+ * method was.
+ */
+ apr_table_setn(r->subprocess_env, "REQUEST_METHOD", r->method);
+
+ /*
+ * Provide a special method for modules to communicate
+ * more informative (than the plain canned) messages to us.
+ * Propagate them to ErrorDocuments via the ERROR_NOTES variable:
+ */
+ if ((error_notes = apr_table_get(r->notes,
+ "error-notes")) != NULL) {
+ apr_table_setn(r->subprocess_env, "ERROR_NOTES", error_notes);
+ }
+ r->method = apr_pstrdup(r->pool, "GET");
+ r->method_number = M_GET;
+ ap_internal_redirect(custom_response, r);
+ return;
+ }
+ else {
+ /*
+ * Dumb user has given us a bad url to redirect to --- fake up
+ * dying with a recursive server error...
+ */
+ recursive_error = HTTP_INTERNAL_SERVER_ERROR;
+ ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r,
+ "Invalid error redirection directive: %s",
+ custom_response);
+ }
+ }
+ ap_send_error_response(r_1st_err, recursive_error);
+}
+
+static void check_pipeline_flush(request_rec *r)
+{
+ conn_rec *c = r->connection;
+ /* ### if would be nice if we could PEEK without a brigade. that would
+ ### allow us to defer creation of the brigade to when we actually
+ ### need to send a FLUSH. */
+ apr_bucket_brigade *bb = apr_brigade_create(r->pool, c->bucket_alloc);
+
+ /* Flush the filter contents if:
+ *
+ * 1) the connection will be closed
+ * 2) there isn't a request ready to be read
+ */
+ /* ### shouldn't this read from the connection input filters? */
+ /* ### is zero correct? that means "read one line" */
+ if (r->connection->keepalive == AP_CONN_CLOSE ||
+ ap_get_brigade(r->input_filters, bb, AP_MODE_EATCRLF,
+ APR_NONBLOCK_READ, 0) != APR_SUCCESS) {
+ apr_bucket *e = apr_bucket_flush_create(c->bucket_alloc);
+
+ /* We just send directly to the connection based filters. At
+ * this point, we know that we have seen all of the data
+ * (request finalization sent an EOS bucket, which empties all
+ * of the request filters). We just want to flush the buckets
+ * if something hasn't been sent to the network yet.
+ */
+ APR_BRIGADE_INSERT_HEAD(bb, e);
+ ap_pass_brigade(r->connection->output_filters, bb);
+ }
+}
+
+void ap_process_request(request_rec *r)
+{
+ int access_status;
+
+ /* Give quick handlers a shot at serving the request on the fast
+ * path, bypassing all of the other Apache hooks.
+ *
+ * This hook was added to enable serving files out of a URI keyed
+ * content cache ( e.g., Mike Abbott's Quick Shortcut Cache,
+ * described here: http://oss.sgi.com/projects/apache/mod_qsc.html )
+ *
+ * It may have other uses as well, such as routing requests directly to
+ * content handlers that have the ability to grok HTTP and do their
+ * own access checking, etc (e.g. servlet engines).
+ *
+ * Use this hook with extreme care and only if you know what you are
+ * doing.
+ */
+ if (ap_extended_status)
+ ap_time_process_request(r->connection->sbh, START_PREQUEST);
+ access_status = ap_run_quick_handler(r, 0); /* Not a look-up request */
+ if (access_status == DECLINED) {
+ access_status = ap_process_request_internal(r);
+ if (access_status == OK) {
+ access_status = ap_invoke_handler(r);
+ }
+ }
+
+ if (access_status == DONE) {
+ /* e.g., something not in storage like TRACE */
+ access_status = OK;
+ }
+
+ if (access_status == OK) {
+ ap_finalize_request_protocol(r);
+ }
+ else {
+ r->status = HTTP_OK;
+ ap_die(access_status, r);
+ }
+
+ /*
+ * We want to flush the last packet if this isn't a pipelining connection
+ * *before* we start into logging. Suppose that the logging causes a DNS
+ * lookup to occur, which may have a high latency. If we hold off on
+ * this packet, then it'll appear like the link is stalled when really
+ * it's the application that's stalled.
+ */
+ check_pipeline_flush(r);
+ ap_update_child_status(r->connection->sbh, SERVER_BUSY_LOG, r);
+ ap_run_log_transaction(r);
+ if (ap_extended_status)
+ ap_time_process_request(r->connection->sbh, STOP_PREQUEST);
+}
+
+static apr_table_t *rename_original_env(apr_pool_t *p, apr_table_t *t)
+{
+ const apr_array_header_t *env_arr = apr_table_elts(t);
+ const apr_table_entry_t *elts = (const apr_table_entry_t *) env_arr->elts;
+ apr_table_t *new = apr_table_make(p, env_arr->nalloc);
+ int i;
+
+ for (i = 0; i < env_arr->nelts; ++i) {
+ if (!elts[i].key)
+ continue;
+ apr_table_setn(new, apr_pstrcat(p, "REDIRECT_", elts[i].key, NULL),
+ elts[i].val);
+ }
+
+ return new;
+}
+
+static request_rec *internal_internal_redirect(const char *new_uri,
+ request_rec *r) {
+ int access_status;
+ request_rec *new;
+
+ if (ap_is_recursion_limit_exceeded(r)) {
+ ap_die(HTTP_INTERNAL_SERVER_ERROR, r);
+ return NULL;
+ }
+
+ new = (request_rec *) apr_pcalloc(r->pool, sizeof(request_rec));
+
+ new->connection = r->connection;
+ new->server = r->server;
+ new->pool = r->pool;
+
+ /*
+ * A whole lot of this really ought to be shared with http_protocol.c...
+ * another missing cleanup. It's particularly inappropriate to be
+ * setting header_only, etc., here.
+ */
+
+ new->method = r->method;
+ new->method_number = r->method_number;
+ new->allowed_methods = ap_make_method_list(new->pool, 2);
+ ap_parse_uri(new, new_uri);
+
+ new->request_config = ap_create_request_config(r->pool);
+
+ new->per_dir_config = r->server->lookup_defaults;
+
+ new->prev = r;
+ r->next = new;
+
+ /* Must have prev and next pointers set before calling create_request
+ * hook.
+ */
+ ap_run_create_request(new);
+
+ /* Inherit the rest of the protocol info... */
+
+ new->the_request = r->the_request;
+
+ new->allowed = r->allowed;
+
+ new->status = r->status;
+ new->assbackwards = r->assbackwards;
+ new->header_only = r->header_only;
+ new->protocol = r->protocol;
+ new->proto_num = r->proto_num;
+ new->hostname = r->hostname;
+ new->request_time = r->request_time;
+ new->main = r->main;
+
+ new->headers_in = r->headers_in;
+ new->headers_out = apr_table_make(r->pool, 12);
+ new->err_headers_out = r->err_headers_out;
+ new->subprocess_env = rename_original_env(r->pool, r->subprocess_env);
+ new->notes = apr_table_make(r->pool, 5);
+ new->allowed_methods = ap_make_method_list(new->pool, 2);
+
+ new->htaccess = r->htaccess;
+ new->no_cache = r->no_cache;
+ new->expecting_100 = r->expecting_100;
+ new->no_local_copy = r->no_local_copy;
+ new->read_length = r->read_length; /* We can only read it once */
+ new->vlist_validator = r->vlist_validator;
+
+ new->proto_output_filters = r->proto_output_filters;
+ new->proto_input_filters = r->proto_input_filters;
+
+ new->output_filters = new->proto_output_filters;
+ new->input_filters = new->proto_input_filters;
+
+ if (new->main) {
+ /* Add back the subrequest filter, which we lost when
+ * we set output_filters to include only the protocol
+ * output filters from the original request.
+ */
+ ap_add_output_filter_handle(ap_subreq_core_filter_handle,
+ NULL, new, new->connection);
+ }
+
+ update_r_in_filters(new->input_filters, r, new);
+ update_r_in_filters(new->output_filters, r, new);
+
+ apr_table_setn(new->subprocess_env, "REDIRECT_STATUS",
+ apr_itoa(r->pool, r->status));
+
+ /*
+ * XXX: hmm. This is because mod_setenvif and mod_unique_id really need
+ * to do their thing on internal redirects as well. Perhaps this is a
+ * misnamed function.
+ */
+ if ((access_status = ap_run_post_read_request(new))) {
+ ap_die(access_status, new);
+ return NULL;
+ }
+
+ return new;
+}
+
+/* XXX: Is this function is so bogus and fragile that we deep-6 it? */
+AP_DECLARE(void) ap_internal_fast_redirect(request_rec *rr, request_rec *r)
+{
+ /* We need to tell POOL_DEBUG that we're guaranteeing that rr->pool
+ * will exist as long as r->pool. Otherwise we run into troubles because
+ * some values in this request will be allocated in r->pool, and others in
+ * rr->pool.
+ */
+ apr_pool_join(r->pool, rr->pool);
+ r->proxyreq = rr->proxyreq;
+ r->no_cache = (r->no_cache && rr->no_cache);
+ r->no_local_copy = (r->no_local_copy && rr->no_local_copy);
+ r->mtime = rr->mtime;
+ r->uri = rr->uri;
+ r->filename = rr->filename;
+ r->canonical_filename = rr->canonical_filename;
+ r->path_info = rr->path_info;
+ r->args = rr->args;
+ r->finfo = rr->finfo;
+ r->handler = rr->handler;
+ ap_set_content_type(r, rr->content_type);
+ r->content_encoding = rr->content_encoding;
+ r->content_languages = rr->content_languages;
+ r->per_dir_config = rr->per_dir_config;
+ /* copy output headers from subrequest, but leave negotiation headers */
+ r->notes = apr_table_overlay(r->pool, rr->notes, r->notes);
+ r->headers_out = apr_table_overlay(r->pool, rr->headers_out,
+ r->headers_out);
+ r->err_headers_out = apr_table_overlay(r->pool, rr->err_headers_out,
+ r->err_headers_out);
+ r->subprocess_env = apr_table_overlay(r->pool, rr->subprocess_env,
+ r->subprocess_env);
+
+ r->output_filters = rr->output_filters;
+ r->input_filters = rr->input_filters;
+
+ if (r->main) {
+ ap_add_output_filter_handle(ap_subreq_core_filter_handle,
+ NULL, r, r->connection);
+ }
+ else if (r->output_filters->frec == ap_subreq_core_filter_handle) {
+ ap_remove_output_filter(r->output_filters);
+ r->output_filters = r->output_filters->next;
+ }
+
+ /* If any filters pointed at the now-defunct rr, we must point them
+ * at our "new" instance of r. In particular, some of rr's structures
+ * will now be bogus (say rr->headers_out). If a filter tried to modify
+ * their f->r structure when it is pointing to rr, the real request_rec
+ * will not get updated. Fix that here.
+ */
+ update_r_in_filters(r->input_filters, rr, r);
+ update_r_in_filters(r->output_filters, rr, r);
+}
+
+AP_DECLARE(void) ap_internal_redirect(const char *new_uri, request_rec *r)
+{
+ request_rec *new = internal_internal_redirect(new_uri, r);
+ int access_status;
+
+ /* ap_die was already called, if an error occured */
+ if (!new) {
+ return;
+ }
+
+ access_status = ap_process_request_internal(new);
+ if (access_status == OK) {
+ if ((access_status = ap_invoke_handler(new)) != 0) {
+ ap_die(access_status, new);
+ return;
+ }
+ ap_finalize_request_protocol(new);
+ }
+ else {
+ ap_die(access_status, new);
+ }
+}
+
+/* This function is designed for things like actions or CGI scripts, when
+ * using AddHandler, and you want to preserve the content type across
+ * an internal redirect.
+ */
+AP_DECLARE(void) ap_internal_redirect_handler(const char *new_uri, request_rec *r)
+{
+ int access_status;
+ request_rec *new = internal_internal_redirect(new_uri, r);
+
+ /* ap_die was already called, if an error occured */
+ if (!new) {
+ return;
+ }
+
+ if (r->handler)
+ ap_set_content_type(new, r->content_type);
+ access_status = ap_process_request_internal(new);
+ if (access_status == OK) {
+ if ((access_status = ap_invoke_handler(new)) != 0) {
+ ap_die(access_status, new);
+ return;
+ }
+ ap_finalize_request_protocol(new);
+ }
+ else {
+ ap_die(access_status, new);
+ }
+}
+
+AP_DECLARE(void) ap_allow_methods(request_rec *r, int reset, ...)
+{
+ const char *method;
+ va_list methods;
+
+ /*
+ * Get rid of any current settings if requested; not just the
+ * well-known methods but any extensions as well.
+ */
+ if (reset) {
+ ap_clear_method_list(r->allowed_methods);
+ }
+
+ va_start(methods, reset);
+ while ((method = va_arg(methods, const char *)) != NULL) {
+ ap_method_list_add(r->allowed_methods, method);
+ }
+ va_end(methods);
+}
+
+AP_DECLARE(void) ap_allow_standard_methods(request_rec *r, int reset, ...)
+{
+ int method;
+ va_list methods;
+ apr_int64_t mask;
+
+ /*
+ * Get rid of any current settings if requested; not just the
+ * well-known methods but any extensions as well.
+ */
+ if (reset) {
+ ap_clear_method_list(r->allowed_methods);
+ }
+
+ mask = 0;
+ va_start(methods, reset);
+ while ((method = va_arg(methods, int)) != -1) {
+ mask |= (AP_METHOD_BIT << method);
+ }
+ va_end(methods);
+
+ r->allowed_methods->method_mask |= mask;
+}
Code Review / bottlenecks.git / blobdiff