mod_alias.c revision 33510984c759eb3da154ceb0db9b75fa0031d3b4
ad07ed37b6b51ef134d4524edaf2259e19ac984fJan Zeleny/* Licensed to the Apache Software Foundation (ASF) under one or more
ad07ed37b6b51ef134d4524edaf2259e19ac984fJan Zeleny * contributor license agreements. See the NOTICE file distributed with
ad07ed37b6b51ef134d4524edaf2259e19ac984fJan Zeleny * this work for additional information regarding copyright ownership.
ad07ed37b6b51ef134d4524edaf2259e19ac984fJan Zeleny * The ASF licenses this file to You under the Apache License, Version 2.0
ad07ed37b6b51ef134d4524edaf2259e19ac984fJan Zeleny * (the "License"); you may not use this file except in compliance with
ad07ed37b6b51ef134d4524edaf2259e19ac984fJan Zeleny * the License. You may obtain a copy of the License at
ad07ed37b6b51ef134d4524edaf2259e19ac984fJan Zeleny * Unless required by applicable law or agreed to in writing, software
ad07ed37b6b51ef134d4524edaf2259e19ac984fJan Zeleny * distributed under the License is distributed on an "AS IS" BASIS,
ad07ed37b6b51ef134d4524edaf2259e19ac984fJan Zeleny * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
ad07ed37b6b51ef134d4524edaf2259e19ac984fJan Zeleny * See the License for the specific language governing permissions and
ad07ed37b6b51ef134d4524edaf2259e19ac984fJan Zeleny * limitations under the License.
ad07ed37b6b51ef134d4524edaf2259e19ac984fJan Zeleny * http_alias.c: Stuff for dealing with directory aliases
ad07ed37b6b51ef134d4524edaf2259e19ac984fJan Zeleny * Original by Rob McCool, rewritten in succession by David Robinson
ad07ed37b6b51ef134d4524edaf2259e19ac984fJan Zelenytypedef struct {
ad07ed37b6b51ef134d4524edaf2259e19ac984fJan Zeleny const char *real;
ad07ed37b6b51ef134d4524edaf2259e19ac984fJan Zeleny const char *fake;
ad07ed37b6b51ef134d4524edaf2259e19ac984fJan Zelenytypedef struct {
fdab7bbf8933351f6254438c30ff361cd748b15aJan Zelenytypedef struct {
ad07ed37b6b51ef134d4524edaf2259e19ac984fJan Zelenystatic void *create_alias_config(apr_pool_t *p, server_rec *s)
ad07ed37b6b51ef134d4524edaf2259e19ac984fJan Zeleny (alias_server_conf *) apr_pcalloc(p, sizeof(alias_server_conf));
ad07ed37b6b51ef134d4524edaf2259e19ac984fJan Zeleny a->aliases = apr_array_make(p, 20, sizeof(alias_entry));
ad07ed37b6b51ef134d4524edaf2259e19ac984fJan Zeleny a->redirects = apr_array_make(p, 20, sizeof(alias_entry));
fdab7bbf8933351f6254438c30ff361cd748b15aJan Zelenystatic void *create_alias_dir_config(apr_pool_t *p, char *d)
fdab7bbf8933351f6254438c30ff361cd748b15aJan Zeleny (alias_dir_conf *) apr_pcalloc(p, sizeof(alias_dir_conf));
fdab7bbf8933351f6254438c30ff361cd748b15aJan Zeleny a->redirects = apr_array_make(p, 2, sizeof(alias_entry));
ad07ed37b6b51ef134d4524edaf2259e19ac984fJan Zelenystatic void *merge_alias_config(apr_pool_t *p, void *basev, void *overridesv)
ad07ed37b6b51ef134d4524edaf2259e19ac984fJan Zeleny (alias_server_conf *) apr_pcalloc(p, sizeof(alias_server_conf));
ad07ed37b6b51ef134d4524edaf2259e19ac984fJan Zeleny alias_server_conf *base = (alias_server_conf *) basev;
fdab7bbf8933351f6254438c30ff361cd748b15aJan Zeleny alias_server_conf *overrides = (alias_server_conf *) overridesv;
ad07ed37b6b51ef134d4524edaf2259e19ac984fJan Zeleny a->aliases = apr_array_append(p, overrides->aliases, base->aliases);
ad07ed37b6b51ef134d4524edaf2259e19ac984fJan Zeleny a->redirects = apr_array_append(p, overrides->redirects, base->redirects);
ad07ed37b6b51ef134d4524edaf2259e19ac984fJan Zelenystatic void *merge_alias_dir_config(apr_pool_t *p, void *basev, void *overridesv)
ad07ed37b6b51ef134d4524edaf2259e19ac984fJan Zeleny (alias_dir_conf *) apr_pcalloc(p, sizeof(alias_dir_conf));
ad07ed37b6b51ef134d4524edaf2259e19ac984fJan Zeleny alias_dir_conf *overrides = (alias_dir_conf *) overridesv;
ad07ed37b6b51ef134d4524edaf2259e19ac984fJan Zeleny a->redirects = apr_array_append(p, overrides->redirects, base->redirects);
ad07ed37b6b51ef134d4524edaf2259e19ac984fJan Zeleny/* need prototype for overlap check */
ad07ed37b6b51ef134d4524edaf2259e19ac984fJan Zelenystatic int alias_matches(const char *uri, const char *alias_fakename);
ad07ed37b6b51ef134d4524edaf2259e19ac984fJan Zelenystatic const char *add_alias_internal(cmd_parms *cmd, void *dummy,
fdab7bbf8933351f6254438c30ff361cd748b15aJan Zeleny alias_server_conf *conf = ap_get_module_config(s->module_config,
fdab7bbf8933351f6254438c30ff361cd748b15aJan Zeleny alias_entry *new = apr_array_push(conf->aliases);
ad07ed37b6b51ef134d4524edaf2259e19ac984fJan Zeleny alias_entry *entries = (alias_entry *)conf->aliases->elts;
fdab7bbf8933351f6254438c30ff361cd748b15aJan Zeleny /* XXX: real can NOT be relative to DocumentRoot here... compat bug. */
fdab7bbf8933351f6254438c30ff361cd748b15aJan Zeleny new->regexp = ap_pregcomp(cmd->pool, fake, AP_REG_EXTENDED);
fdab7bbf8933351f6254438c30ff361cd748b15aJan Zeleny return "Regular expression could not be compiled.";
ad07ed37b6b51ef134d4524edaf2259e19ac984fJan Zeleny /* XXX This may be optimized, but we must know that new->real
ad07ed37b6b51ef134d4524edaf2259e19ac984fJan Zeleny * exists. If so, we can dir merge later, trusing new->real
ad07ed37b6b51ef134d4524edaf2259e19ac984fJan Zeleny * and just canonicalizing the remainder. Not till I finish
ad07ed37b6b51ef134d4524edaf2259e19ac984fJan Zeleny * cleaning out the old ap_canonical stuff first.
ad07ed37b6b51ef134d4524edaf2259e19ac984fJan Zeleny /* check for overlapping (Script)Alias directives
ad07ed37b6b51ef134d4524edaf2259e19ac984fJan Zeleny * and throw a warning if found one
ad07ed37b6b51ef134d4524edaf2259e19ac984fJan Zeleny if ( (!alias->regexp && alias_matches(fake, alias->fake) > 0)
ad07ed37b6b51ef134d4524edaf2259e19ac984fJan Zeleny || (alias->regexp && !ap_regexec(alias->regexp, fake, 0, NULL, 0))) {
ad07ed37b6b51ef134d4524edaf2259e19ac984fJan Zeleny ap_log_error(APLOG_MARK, APLOG_WARNING, 0, cmd->server,
ad07ed37b6b51ef134d4524edaf2259e19ac984fJan Zeleny "The %s directive in %s at line %d will probably "
ad07ed37b6b51ef134d4524edaf2259e19ac984fJan Zeleny "never match because it overlaps an earlier "
ad07ed37b6b51ef134d4524edaf2259e19ac984fJan Zeleny "%sAlias%s.",
ad07ed37b6b51ef134d4524edaf2259e19ac984fJan Zeleny break; /* one warning per alias should be sufficient */
ad07ed37b6b51ef134d4524edaf2259e19ac984fJan Zelenystatic const char *add_alias(cmd_parms *cmd, void *dummy, const char *fake,
ad07ed37b6b51ef134d4524edaf2259e19ac984fJan Zeleny const char *real)
ad07ed37b6b51ef134d4524edaf2259e19ac984fJan Zeleny return add_alias_internal(cmd, dummy, fake, real, 0);
ad07ed37b6b51ef134d4524edaf2259e19ac984fJan Zelenystatic const char *add_alias_regex(cmd_parms *cmd, void *dummy,
ad07ed37b6b51ef134d4524edaf2259e19ac984fJan Zeleny return add_alias_internal(cmd, dummy, fake, real, 1);
ad07ed37b6b51ef134d4524edaf2259e19ac984fJan Zelenystatic const char *add_redirect_internal(cmd_parms *cmd,
ad07ed37b6b51ef134d4524edaf2259e19ac984fJan Zeleny alias_server_conf *serverconf = ap_get_module_config(s->module_config,
ad07ed37b6b51ef134d4524edaf2259e19ac984fJan Zeleny * Logic flow:
ad07ed37b6b51ef134d4524edaf2259e19ac984fJan Zeleny * Go ahead and try to grok the 1st arg, in case it is a
ad07ed37b6b51ef134d4524edaf2259e19ac984fJan Zeleny * Redirect status. Now if we have 3 args, we expect that
ad07ed37b6b51ef134d4524edaf2259e19ac984fJan Zeleny * we were able to understand that 1st argument (it's something
ad07ed37b6b51ef134d4524edaf2259e19ac984fJan Zeleny * we expected, so if not, then we bail
ad07ed37b6b51ef134d4524edaf2259e19ac984fJan Zeleny return "Redirect: invalid first argument (of three)";
ad07ed37b6b51ef134d4524edaf2259e19ac984fJan Zeleny * if we don't have the 3rd arg and we didn't understand the 1st
ad07ed37b6b51ef134d4524edaf2259e19ac984fJan Zeleny * one, then assume URL-path URL. This also handles case, eg, GONE
ad07ed37b6b51ef134d4524edaf2259e19ac984fJan Zeleny * we even though we don't have a 3rd arg, we did understand the 1st
ad07ed37b6b51ef134d4524edaf2259e19ac984fJan Zeleny * one, so we don't want to re-arrange
ad07ed37b6b51ef134d4524edaf2259e19ac984fJan Zeleny regex = ap_pregcomp(cmd->pool, fake, AP_REG_EXTENDED);
ad07ed37b6b51ef134d4524edaf2259e19ac984fJan Zeleny return "Regular expression could not be compiled.";
fdab7bbf8933351f6254438c30ff361cd748b15aJan Zeleny return "URL to redirect to is missing";
ad07ed37b6b51ef134d4524edaf2259e19ac984fJan Zeleny /* PR#35314: we can allow path components here;
ad07ed37b6b51ef134d4524edaf2259e19ac984fJan Zeleny * they get correctly resolved to full URLs.
ad07ed37b6b51ef134d4524edaf2259e19ac984fJan Zeleny if (!use_regex && !ap_is_url(url) && (url[0] != '/'))
ad07ed37b6b51ef134d4524edaf2259e19ac984fJan Zeleny return "Redirect to non-URL";
ad07ed37b6b51ef134d4524edaf2259e19ac984fJan Zeleny return "Redirect URL not valid for this status";
ad07ed37b6b51ef134d4524edaf2259e19ac984fJan Zelenystatic const char *add_redirect(cmd_parms *cmd, void *dirconf,
ad07ed37b6b51ef134d4524edaf2259e19ac984fJan Zeleny const char *arg3)
ad07ed37b6b51ef134d4524edaf2259e19ac984fJan Zeleny return add_redirect_internal(cmd, dirconf, arg1, arg2, arg3, 0);
ad07ed37b6b51ef134d4524edaf2259e19ac984fJan Zelenystatic const char *add_redirect2(cmd_parms *cmd, void *dirconf,
fdab7bbf8933351f6254438c30ff361cd748b15aJan Zeleny return add_redirect_internal(cmd, dirconf, arg1, arg2, NULL, 0);
ad07ed37b6b51ef134d4524edaf2259e19ac984fJan Zelenystatic const char *add_redirect_regex(cmd_parms *cmd, void *dirconf,
ad07ed37b6b51ef134d4524edaf2259e19ac984fJan Zeleny const char *arg3)
ad07ed37b6b51ef134d4524edaf2259e19ac984fJan Zeleny return add_redirect_internal(cmd, dirconf, arg1, arg2, arg3, 1);
ad07ed37b6b51ef134d4524edaf2259e19ac984fJan Zeleny AP_INIT_TAKE2("Alias", add_alias, NULL, RSRC_CONF,
ad07ed37b6b51ef134d4524edaf2259e19ac984fJan Zeleny "a fakename and a realname"),
ad07ed37b6b51ef134d4524edaf2259e19ac984fJan Zeleny AP_INIT_TAKE2("ScriptAlias", add_alias, "cgi-script", RSRC_CONF,
ad07ed37b6b51ef134d4524edaf2259e19ac984fJan Zeleny "a fakename and a realname"),
ad07ed37b6b51ef134d4524edaf2259e19ac984fJan Zeleny AP_INIT_TAKE23("Redirect", add_redirect, (void *) HTTP_MOVED_TEMPORARILY,
ad07ed37b6b51ef134d4524edaf2259e19ac984fJan Zeleny "an optional status, then document to be redirected and "
ad07ed37b6b51ef134d4524edaf2259e19ac984fJan Zeleny "destination URL"),
ad07ed37b6b51ef134d4524edaf2259e19ac984fJan Zeleny AP_INIT_TAKE2("AliasMatch", add_alias_regex, NULL, RSRC_CONF,
ad07ed37b6b51ef134d4524edaf2259e19ac984fJan Zeleny "a regular expression and a filename"),
ad07ed37b6b51ef134d4524edaf2259e19ac984fJan Zeleny AP_INIT_TAKE2("ScriptAliasMatch", add_alias_regex, "cgi-script", RSRC_CONF,
ad07ed37b6b51ef134d4524edaf2259e19ac984fJan Zeleny "a regular expression and a filename"),
ad07ed37b6b51ef134d4524edaf2259e19ac984fJan Zeleny AP_INIT_TAKE23("RedirectMatch", add_redirect_regex,
ad07ed37b6b51ef134d4524edaf2259e19ac984fJan Zeleny "an optional status, then a regular expression and "
ad07ed37b6b51ef134d4524edaf2259e19ac984fJan Zeleny "destination URL"),
ad07ed37b6b51ef134d4524edaf2259e19ac984fJan Zeleny "a document to be redirected, then the destination URL"),
ad07ed37b6b51ef134d4524edaf2259e19ac984fJan Zeleny AP_INIT_TAKE2("RedirectPermanent", add_redirect2,
ad07ed37b6b51ef134d4524edaf2259e19ac984fJan Zeleny "a document to be redirected, then the destination URL"),
fdab7bbf8933351f6254438c30ff361cd748b15aJan Zelenystatic int alias_matches(const char *uri, const char *alias_fakename)
fdab7bbf8933351f6254438c30ff361cd748b15aJan Zeleny const char *aliasp = alias_fakename, *urip = uri;
ad07ed37b6b51ef134d4524edaf2259e19ac984fJan Zeleny /* any number of '/' in the alias matches any number in
ad07ed37b6b51ef134d4524edaf2259e19ac984fJan Zeleny * the supplied URI, but there must be at least one...
ad07ed37b6b51ef134d4524edaf2259e19ac984fJan Zeleny /* Other characters are compared literally */
ad07ed37b6b51ef134d4524edaf2259e19ac984fJan Zeleny /* Check last alias path component matched all the way */
ad07ed37b6b51ef134d4524edaf2259e19ac984fJan Zeleny if (aliasp[-1] != '/' && *urip != '\0' && *urip != '/')
ad07ed37b6b51ef134d4524edaf2259e19ac984fJan Zeleny /* Return number of characters from URI which matched (may be
ad07ed37b6b51ef134d4524edaf2259e19ac984fJan Zeleny * greater than length of alias, since we may have matched
ad07ed37b6b51ef134d4524edaf2259e19ac984fJan Zeleny * doubled slashes)
ad07ed37b6b51ef134d4524edaf2259e19ac984fJan Zelenystatic char *try_alias_list(request_rec *r, apr_array_header_t *aliases,
ad07ed37b6b51ef134d4524edaf2259e19ac984fJan Zeleny alias_entry *entries = (alias_entry *) aliases->elts;
ad07ed37b6b51ef134d4524edaf2259e19ac984fJan Zeleny if (!ap_regexec(alias->regexp, r->uri, AP_MAX_REG_MATCH, regm, 0)) {
ad07ed37b6b51ef134d4524edaf2259e19ac984fJan Zeleny /* Do not escape the query string or fragment. */
ad07ed37b6b51ef134d4524edaf2259e19ac984fJan Zeleny /* need something non-null */
ad07ed37b6b51ef134d4524edaf2259e19ac984fJan Zeleny if (l > 0) {
ad07ed37b6b51ef134d4524edaf2259e19ac984fJan Zeleny ap_set_context_info(r, alias->fake, alias->real);
ad07ed37b6b51ef134d4524edaf2259e19ac984fJan Zeleny escurl = ap_os_escape_path(r->pool, r->uri + l, 1);
fdab7bbf8933351f6254438c30ff361cd748b15aJan Zeleny found = apr_pstrcat(r->pool, alias->real, escurl, NULL);
ad07ed37b6b51ef134d4524edaf2259e19ac984fJan Zeleny found = apr_pstrcat(r->pool, alias->real, r->uri + l, NULL);
ad07ed37b6b51ef134d4524edaf2259e19ac984fJan Zeleny if (alias->handler) { /* Set handler, and leave a note for mod_cgi */
ad07ed37b6b51ef134d4524edaf2259e19ac984fJan Zeleny apr_table_setn(r->notes, "alias-forced-type", r->handler);
ad07ed37b6b51ef134d4524edaf2259e19ac984fJan Zeleny /* XXX This is as SLOW as can be, next step, we optimize
ad07ed37b6b51ef134d4524edaf2259e19ac984fJan Zeleny * and merge to whatever part of the found path was already
ad07ed37b6b51ef134d4524edaf2259e19ac984fJan Zeleny * canonicalized. After I finish eliminating os canonical.
ad07ed37b6b51ef134d4524edaf2259e19ac984fJan Zeleny * Better fail test for ap_server_root_relative needed here.
ad07ed37b6b51ef134d4524edaf2259e19ac984fJan Zeleny ap_conf_vector_t *sconf = r->server->module_config;
ad07ed37b6b51ef134d4524edaf2259e19ac984fJan Zeleny alias_server_conf *serverconf = ap_get_module_config(sconf, &alias_module);
ad07ed37b6b51ef134d4524edaf2259e19ac984fJan Zeleny if ((ret = try_alias_list(r, serverconf->redirects, 1, &status)) != NULL) {
return status;
return OK;
return DECLINED;
char *ret;
int status;
return status;
return DECLINED;