| /* Copyright 1999-2004 The Apache Software Foundation |
| * |
| * Licensed 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 "scoreboard.h" |
| |
| #include "mod_core.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. |
| */ |
| 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 { |
| 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); |
| } |
| |
| 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_run_quick_handler(new, 0); /* Not a look-up request */ |
| if (access_status == DECLINED) { |
| access_status = ap_process_request_internal(new); |
| if (access_status == OK) { |
| access_status = ap_invoke_handler(new); |
| } |
| } |
| if (access_status == OK) { |
| 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); |
| } |
| } |
| |
| 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; |
| } |
