diff options
Diffstat (limited to 'rubbos/app/httpd-2.0.64/modules/http/http_request.c')
| -rw-r--r-- | rubbos/app/httpd-2.0.64/modules/http/http_request.c | 548 |
1 files changed, 548 insertions, 0 deletions
diff --git a/rubbos/app/httpd-2.0.64/modules/http/http_request.c b/rubbos/app/httpd-2.0.64/modules/http/http_request.c new file mode 100644 index 00000000..c80816d2 --- /dev/null +++ b/rubbos/app/httpd-2.0.64/modules/http/http_request.c @@ -0,0 +1,548 @@ +/* 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; +} |