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92e366007c
git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@1209766 13f79535-47bb-0310-9956-ffa450edef68
555 lines
19 KiB
C
555 lines
19 KiB
C
/* 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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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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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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*/
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/*
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* http_alias.c: Stuff for dealing with directory aliases
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*
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* Original by Rob McCool, rewritten in succession by David Robinson
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* and rst.
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*
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*/
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#include "apr_strings.h"
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#include "apr_lib.h"
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#define APR_WANT_STRFUNC
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#include "apr_want.h"
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#include "ap_config.h"
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#include "httpd.h"
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#include "http_core.h"
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#include "http_config.h"
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#include "http_request.h"
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#include "http_log.h"
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typedef struct {
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const char *real;
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const char *fake;
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char *handler;
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ap_regex_t *regexp;
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int redir_status; /* 301, 302, 303, 410, etc */
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} alias_entry;
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typedef struct {
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apr_array_header_t *aliases;
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apr_array_header_t *redirects;
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} alias_server_conf;
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typedef struct {
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apr_array_header_t *redirects;
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} alias_dir_conf;
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module AP_MODULE_DECLARE_DATA alias_module;
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static void *create_alias_config(apr_pool_t *p, server_rec *s)
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{
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alias_server_conf *a =
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(alias_server_conf *) apr_pcalloc(p, sizeof(alias_server_conf));
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a->aliases = apr_array_make(p, 20, sizeof(alias_entry));
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a->redirects = apr_array_make(p, 20, sizeof(alias_entry));
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return a;
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}
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static void *create_alias_dir_config(apr_pool_t *p, char *d)
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{
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alias_dir_conf *a =
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(alias_dir_conf *) apr_pcalloc(p, sizeof(alias_dir_conf));
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a->redirects = apr_array_make(p, 2, sizeof(alias_entry));
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return a;
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}
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static void *merge_alias_config(apr_pool_t *p, void *basev, void *overridesv)
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{
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alias_server_conf *a =
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(alias_server_conf *) apr_pcalloc(p, sizeof(alias_server_conf));
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alias_server_conf *base = (alias_server_conf *) basev;
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alias_server_conf *overrides = (alias_server_conf *) overridesv;
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a->aliases = apr_array_append(p, overrides->aliases, base->aliases);
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a->redirects = apr_array_append(p, overrides->redirects, base->redirects);
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return a;
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}
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static void *merge_alias_dir_config(apr_pool_t *p, void *basev, void *overridesv)
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{
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alias_dir_conf *a =
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(alias_dir_conf *) apr_pcalloc(p, sizeof(alias_dir_conf));
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alias_dir_conf *base = (alias_dir_conf *) basev;
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alias_dir_conf *overrides = (alias_dir_conf *) overridesv;
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a->redirects = apr_array_append(p, overrides->redirects, base->redirects);
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return a;
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}
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/* need prototype for overlap check */
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static int alias_matches(const char *uri, const char *alias_fakename);
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static const char *add_alias_internal(cmd_parms *cmd, void *dummy,
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const char *fake, const char *real,
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int use_regex)
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{
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server_rec *s = cmd->server;
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alias_server_conf *conf = ap_get_module_config(s->module_config,
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&alias_module);
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alias_entry *new = apr_array_push(conf->aliases);
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alias_entry *entries = (alias_entry *)conf->aliases->elts;
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int i;
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/* XXX: real can NOT be relative to DocumentRoot here... compat bug. */
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if (use_regex) {
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new->regexp = ap_pregcomp(cmd->pool, fake, AP_REG_EXTENDED);
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if (new->regexp == NULL)
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return "Regular expression could not be compiled.";
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new->real = real;
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}
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else {
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/* XXX This may be optimized, but we must know that new->real
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* exists. If so, we can dir merge later, trusing new->real
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* and just canonicalizing the remainder. Not till I finish
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* cleaning out the old ap_canonical stuff first.
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*/
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new->real = real;
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}
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new->fake = fake;
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new->handler = cmd->info;
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/* check for overlapping (Script)Alias directives
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* and throw a warning if found one
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*/
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if (!use_regex) {
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for (i = 0; i < conf->aliases->nelts - 1; ++i) {
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alias_entry *alias = &entries[i];
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if ( (!alias->regexp && alias_matches(fake, alias->fake) > 0)
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|| (alias->regexp && !ap_regexec(alias->regexp, fake, 0, NULL, 0))) {
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ap_log_error(APLOG_MARK, APLOG_WARNING, 0, cmd->server, APLOGNO(00671)
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"The %s directive in %s at line %d will probably "
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"never match because it overlaps an earlier "
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"%sAlias%s.",
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cmd->cmd->name, cmd->directive->filename,
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cmd->directive->line_num,
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alias->handler ? "Script" : "",
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alias->regexp ? "Match" : "");
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break; /* one warning per alias should be sufficient */
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}
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}
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}
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return NULL;
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}
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static const char *add_alias(cmd_parms *cmd, void *dummy, const char *fake,
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const char *real)
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{
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return add_alias_internal(cmd, dummy, fake, real, 0);
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}
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static const char *add_alias_regex(cmd_parms *cmd, void *dummy,
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const char *fake, const char *real)
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{
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return add_alias_internal(cmd, dummy, fake, real, 1);
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}
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static const char *add_redirect_internal(cmd_parms *cmd,
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alias_dir_conf *dirconf,
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const char *arg1, const char *arg2,
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const char *arg3, int use_regex)
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{
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alias_entry *new;
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server_rec *s = cmd->server;
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alias_server_conf *serverconf = ap_get_module_config(s->module_config,
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&alias_module);
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int status = (int) (long) cmd->info;
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int grokarg1 = 1;
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ap_regex_t *regex = NULL;
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const char *fake = arg2;
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const char *url = arg3;
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/*
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* Logic flow:
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* Go ahead and try to grok the 1st arg, in case it is a
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* Redirect status. Now if we have 3 args, we expect that
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* we were able to understand that 1st argument (it's something
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* we expected, so if not, then we bail
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*/
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if (!strcasecmp(arg1, "permanent"))
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status = HTTP_MOVED_PERMANENTLY;
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else if (!strcasecmp(arg1, "temp"))
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status = HTTP_MOVED_TEMPORARILY;
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else if (!strcasecmp(arg1, "seeother"))
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status = HTTP_SEE_OTHER;
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else if (!strcasecmp(arg1, "gone"))
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status = HTTP_GONE;
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else if (apr_isdigit(*arg1))
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status = atoi(arg1);
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else
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grokarg1 = 0;
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if (arg3 && !grokarg1)
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return "Redirect: invalid first argument (of three)";
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/*
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* if we don't have the 3rd arg and we didn't understand the 1st
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* one, then assume URL-path URL. This also handles case, eg, GONE
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* we even though we don't have a 3rd arg, we did understand the 1st
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* one, so we don't want to re-arrange
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*/
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if (!arg3 && !grokarg1) {
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fake = arg1;
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url = arg2;
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}
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if (use_regex) {
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regex = ap_pregcomp(cmd->pool, fake, AP_REG_EXTENDED);
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if (regex == NULL)
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return "Regular expression could not be compiled.";
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}
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if (ap_is_HTTP_REDIRECT(status)) {
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if (!url)
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return "URL to redirect to is missing";
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/* PR#35314: we can allow path components here;
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* they get correctly resolved to full URLs.
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*/
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if (!use_regex && !ap_is_url(url) && (url[0] != '/'))
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return "Redirect to non-URL";
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}
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else {
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if (url)
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return "Redirect URL not valid for this status";
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}
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if (cmd->path)
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new = apr_array_push(dirconf->redirects);
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else
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new = apr_array_push(serverconf->redirects);
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new->fake = fake;
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new->real = url;
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new->regexp = regex;
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new->redir_status = status;
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return NULL;
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}
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static const char *add_redirect(cmd_parms *cmd, void *dirconf,
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const char *arg1, const char *arg2,
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const char *arg3)
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{
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return add_redirect_internal(cmd, dirconf, arg1, arg2, arg3, 0);
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}
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static const char *add_redirect2(cmd_parms *cmd, void *dirconf,
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const char *arg1, const char *arg2)
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{
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return add_redirect_internal(cmd, dirconf, arg1, arg2, NULL, 0);
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}
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static const char *add_redirect_regex(cmd_parms *cmd, void *dirconf,
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const char *arg1, const char *arg2,
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const char *arg3)
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{
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return add_redirect_internal(cmd, dirconf, arg1, arg2, arg3, 1);
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}
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static const command_rec alias_cmds[] =
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{
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AP_INIT_TAKE2("Alias", add_alias, NULL, RSRC_CONF,
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"a fakename and a realname"),
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AP_INIT_TAKE2("ScriptAlias", add_alias, "cgi-script", RSRC_CONF,
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"a fakename and a realname"),
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AP_INIT_TAKE23("Redirect", add_redirect, (void *) HTTP_MOVED_TEMPORARILY,
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OR_FILEINFO,
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"an optional status, then document to be redirected and "
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"destination URL"),
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AP_INIT_TAKE2("AliasMatch", add_alias_regex, NULL, RSRC_CONF,
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"a regular expression and a filename"),
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AP_INIT_TAKE2("ScriptAliasMatch", add_alias_regex, "cgi-script", RSRC_CONF,
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"a regular expression and a filename"),
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AP_INIT_TAKE23("RedirectMatch", add_redirect_regex,
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(void *) HTTP_MOVED_TEMPORARILY, OR_FILEINFO,
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"an optional status, then a regular expression and "
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"destination URL"),
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AP_INIT_TAKE2("RedirectTemp", add_redirect2,
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(void *) HTTP_MOVED_TEMPORARILY, OR_FILEINFO,
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"a document to be redirected, then the destination URL"),
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AP_INIT_TAKE2("RedirectPermanent", add_redirect2,
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(void *) HTTP_MOVED_PERMANENTLY, OR_FILEINFO,
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"a document to be redirected, then the destination URL"),
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{NULL}
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};
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static int alias_matches(const char *uri, const char *alias_fakename)
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{
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const char *aliasp = alias_fakename, *urip = uri;
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while (*aliasp) {
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if (*aliasp == '/') {
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/* any number of '/' in the alias matches any number in
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* the supplied URI, but there must be at least one...
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*/
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if (*urip != '/')
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return 0;
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do {
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++aliasp;
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} while (*aliasp == '/');
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do {
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++urip;
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} while (*urip == '/');
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}
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else {
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/* Other characters are compared literally */
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if (*urip++ != *aliasp++)
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return 0;
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}
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}
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/* Check last alias path component matched all the way */
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if (aliasp[-1] != '/' && *urip != '\0' && *urip != '/')
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return 0;
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/* Return number of characters from URI which matched (may be
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* greater than length of alias, since we may have matched
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* doubled slashes)
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*/
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return urip - uri;
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}
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static char magic_error_value;
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#define PREGSUB_ERROR (&magic_error_value)
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static char *try_alias_list(request_rec *r, apr_array_header_t *aliases,
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int is_redir, int *status)
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{
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alias_entry *entries = (alias_entry *) aliases->elts;
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ap_regmatch_t regm[AP_MAX_REG_MATCH];
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char *found = NULL;
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int i;
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for (i = 0; i < aliases->nelts; ++i) {
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alias_entry *alias = &entries[i];
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int l;
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if (alias->regexp) {
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if (!ap_regexec(alias->regexp, r->uri, AP_MAX_REG_MATCH, regm, 0)) {
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if (alias->real) {
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found = ap_pregsub(r->pool, alias->real, r->uri,
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AP_MAX_REG_MATCH, regm);
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if (found) {
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if (is_redir) {
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apr_uri_t uri;
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apr_uri_parse(r->pool, found, &uri);
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/* Do not escape the query string or fragment. */
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found = apr_uri_unparse(r->pool, &uri,
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APR_URI_UNP_OMITQUERY);
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found = ap_escape_uri(r->pool, found);
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if (uri.query) {
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found = apr_pstrcat(r->pool, found, "?",
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uri.query, NULL);
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}
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if (uri.fragment) {
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found = apr_pstrcat(r->pool, found, "#",
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uri.fragment, NULL);
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}
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}
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else {
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int pathlen = strlen(found) -
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(strlen(r->uri + regm[0].rm_eo));
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AP_DEBUG_ASSERT(pathlen >= 0);
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AP_DEBUG_ASSERT(pathlen <= strlen(found));
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ap_set_context_info(r,
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apr_pstrmemdup(r->pool, r->uri,
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regm[0].rm_eo),
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apr_pstrmemdup(r->pool, found,
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pathlen));
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}
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}
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else {
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ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r, APLOGNO(00672)
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"Regex substitution in '%s' failed. "
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"Replacement too long?", alias->real);
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return PREGSUB_ERROR;
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}
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}
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else {
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/* need something non-null */
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found = "";
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}
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}
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}
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else {
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l = alias_matches(r->uri, alias->fake);
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if (l > 0) {
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ap_set_context_info(r, alias->fake, alias->real);
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if (is_redir) {
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char *escurl;
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escurl = ap_os_escape_path(r->pool, r->uri + l, 1);
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found = apr_pstrcat(r->pool, alias->real, escurl, NULL);
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}
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else
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found = apr_pstrcat(r->pool, alias->real, r->uri + l, NULL);
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}
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}
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if (found) {
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if (alias->handler) { /* Set handler, and leave a note for mod_cgi */
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r->handler = alias->handler;
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apr_table_setn(r->notes, "alias-forced-type", r->handler);
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}
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/* XXX This is as SLOW as can be, next step, we optimize
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* and merge to whatever part of the found path was already
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* canonicalized. After I finish eliminating os canonical.
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* Better fail test for ap_server_root_relative needed here.
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*/
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if (!is_redir) {
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found = ap_server_root_relative(r->pool, found);
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}
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if (found) {
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*status = alias->redir_status;
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}
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return found;
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}
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}
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return NULL;
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}
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static int translate_alias_redir(request_rec *r)
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{
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ap_conf_vector_t *sconf = r->server->module_config;
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alias_server_conf *serverconf = ap_get_module_config(sconf, &alias_module);
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char *ret;
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int status;
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if (r->uri[0] != '/' && r->uri[0] != '\0') {
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return DECLINED;
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}
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if ((ret = try_alias_list(r, serverconf->redirects, 1, &status)) != NULL) {
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if (ret == PREGSUB_ERROR)
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return HTTP_INTERNAL_SERVER_ERROR;
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if (ap_is_HTTP_REDIRECT(status)) {
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if (ret[0] == '/') {
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char *orig_target = ret;
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ret = ap_construct_url(r->pool, ret, r);
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ap_log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r, APLOGNO(00673)
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"incomplete redirection target of '%s' for "
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"URI '%s' modified to '%s'",
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orig_target, r->uri, ret);
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}
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if (!ap_is_url(ret)) {
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status = HTTP_INTERNAL_SERVER_ERROR;
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ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r, APLOGNO(00674)
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"cannot redirect '%s' to '%s'; "
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"target is not a valid absoluteURI or abs_path",
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r->uri, ret);
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}
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else {
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/* append requested query only, if the config didn't
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* supply its own.
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*/
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if (r->args && !ap_strchr(ret, '?')) {
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ret = apr_pstrcat(r->pool, ret, "?", r->args, NULL);
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}
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apr_table_setn(r->headers_out, "Location", ret);
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}
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}
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return status;
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}
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if ((ret = try_alias_list(r, serverconf->aliases, 0, &status)) != NULL) {
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r->filename = ret;
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return OK;
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}
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return DECLINED;
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}
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static int fixup_redir(request_rec *r)
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{
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void *dconf = r->per_dir_config;
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alias_dir_conf *dirconf =
|
|
(alias_dir_conf *) ap_get_module_config(dconf, &alias_module);
|
|
char *ret;
|
|
int status;
|
|
|
|
/* It may have changed since last time, so try again */
|
|
|
|
if ((ret = try_alias_list(r, dirconf->redirects, 1, &status)) != NULL) {
|
|
if (ret == PREGSUB_ERROR)
|
|
return HTTP_INTERNAL_SERVER_ERROR;
|
|
if (ap_is_HTTP_REDIRECT(status)) {
|
|
if (ret[0] == '/') {
|
|
char *orig_target = ret;
|
|
|
|
ret = ap_construct_url(r->pool, ret, r);
|
|
ap_log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r, APLOGNO(00675)
|
|
"incomplete redirection target of '%s' for "
|
|
"URI '%s' modified to '%s'",
|
|
orig_target, r->uri, ret);
|
|
}
|
|
if (!ap_is_url(ret)) {
|
|
status = HTTP_INTERNAL_SERVER_ERROR;
|
|
ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r, APLOGNO(00676)
|
|
"cannot redirect '%s' to '%s'; "
|
|
"target is not a valid absoluteURI or abs_path",
|
|
r->uri, ret);
|
|
}
|
|
else {
|
|
/* append requested query only, if the config didn't
|
|
* supply its own.
|
|
*/
|
|
if (r->args && !ap_strchr(ret, '?')) {
|
|
ret = apr_pstrcat(r->pool, ret, "?", r->args, NULL);
|
|
}
|
|
apr_table_setn(r->headers_out, "Location", ret);
|
|
}
|
|
}
|
|
return status;
|
|
}
|
|
|
|
return DECLINED;
|
|
}
|
|
|
|
static void register_hooks(apr_pool_t *p)
|
|
{
|
|
static const char * const aszSucc[]={ "mod_userdir.c",
|
|
"mod_vhost_alias.c",NULL };
|
|
|
|
ap_hook_translate_name(translate_alias_redir,NULL,aszSucc,APR_HOOK_MIDDLE);
|
|
ap_hook_fixups(fixup_redir,NULL,NULL,APR_HOOK_MIDDLE);
|
|
}
|
|
|
|
AP_DECLARE_MODULE(alias) =
|
|
{
|
|
STANDARD20_MODULE_STUFF,
|
|
create_alias_dir_config, /* dir config creater */
|
|
merge_alias_dir_config, /* dir merger --- default is to override */
|
|
create_alias_config, /* server config */
|
|
merge_alias_config, /* merge server configs */
|
|
alias_cmds, /* command apr_table_t */
|
|
register_hooks /* register hooks */
|
|
};
|