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- /* ====================================================================
- * Copyright (c) 1995-1999 The Apache Group. All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- *
- * 1. Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- *
- * 2. Redistributions in binary form must reproduce the above copyright
- * notice, this list of conditions and the following disclaimer in
- * the documentation and/or other materials provided with the
- * distribution.
- *
- * 3. All advertising materials mentioning features or use of this
- * software must display the following acknowledgment:
- * "This product includes software developed by the Apache Group
- * for use in the Apache HTTP server project (http://www.apache.org/)."
- *
- * 4. The names "Apache Server" and "Apache Group" must not be used to
- * endorse or promote products derived from this software without
- * prior written permission. For written permission, please contact
- * apache@apache.org.
- *
- * 5. Products derived from this software may not be called "Apache"
- * nor may "Apache" appear in their names without prior written
- * permission of the Apache Group.
- *
- * 6. Redistributions of any form whatsoever must retain the following
- * acknowledgment:
- * "This product includes software developed by the Apache Group
- * for use in the Apache HTTP server project (http://www.apache.org/)."
- *
- * THIS SOFTWARE IS PROVIDED BY THE APACHE GROUP ``AS IS'' AND ANY
- * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
- * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE APACHE GROUP OR
- * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
- * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
- * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
- * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
- * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
- * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
- * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
- * OF THE POSSIBILITY OF SUCH DAMAGE.
- * ====================================================================
- *
- * This software consists of voluntary contributions made by many
- * individuals on behalf of the Apache Group and was originally based
- * on public domain software written at the National Center for
- * Supercomputing Applications, University of Illinois, Urbana-Champaign.
- * For more information on the Apache Group and the Apache HTTP server
- * project, please see <http://www.apache.org/>.
- *
- */
-
- /*
- * http_alias.c: Stuff for dealing with directory aliases
- *
- * Original by Rob McCool, rewritten in succession by David Robinson
- * and rst.
- *
- */
-
- #include "httpd.h"
- #include "http_config.h"
-
- typedef struct {
- char *real;
- char *fake;
- char *handler;
- regex_t *regexp;
- int redir_status; /* 301, 302, 303, 410, etc */
- } alias_entry;
-
- typedef struct {
- array_header *aliases;
- array_header *redirects;
- } alias_server_conf;
-
- typedef struct {
- array_header *redirects;
- } alias_dir_conf;
-
- module MODULE_VAR_EXPORT alias_module;
-
- static void *create_alias_config(pool *p, server_rec *s)
- {
- alias_server_conf *a =
- (alias_server_conf *) ap_pcalloc(p, sizeof(alias_server_conf));
-
- a->aliases = ap_make_array(p, 20, sizeof(alias_entry));
- a->redirects = ap_make_array(p, 20, sizeof(alias_entry));
- return a;
- }
-
- static void *create_alias_dir_config(pool *p, char *d)
- {
- alias_dir_conf *a =
- (alias_dir_conf *) ap_pcalloc(p, sizeof(alias_dir_conf));
- a->redirects = ap_make_array(p, 2, sizeof(alias_entry));
- return a;
- }
-
- static void *merge_alias_config(pool *p, void *basev, void *overridesv)
- {
- alias_server_conf *a =
- (alias_server_conf *) ap_pcalloc(p, sizeof(alias_server_conf));
- alias_server_conf *base = (alias_server_conf *) basev, *overrides = (alias_server_conf *) overridesv;
-
- a->aliases = ap_append_arrays(p, overrides->aliases, base->aliases);
- a->redirects = ap_append_arrays(p, overrides->redirects, base->redirects);
- return a;
- }
-
- static void *merge_alias_dir_config(pool *p, void *basev, void *overridesv)
- {
- alias_dir_conf *a =
- (alias_dir_conf *) ap_pcalloc(p, sizeof(alias_dir_conf));
- alias_dir_conf *base = (alias_dir_conf *) basev, *overrides = (alias_dir_conf *) overridesv;
- a->redirects = ap_append_arrays(p, overrides->redirects, base->redirects);
- return a;
- }
-
- static const char *add_alias_internal(cmd_parms *cmd, void *dummy, char *f, char *r,
- int use_regex)
- {
- server_rec *s = cmd->server;
- alias_server_conf *conf =
- (alias_server_conf *) ap_get_module_config(s->module_config, &alias_module);
- alias_entry *new = ap_push_array(conf->aliases);
-
- /* XX r can NOT be relative to DocumentRoot here... compat bug. */
-
- if (use_regex) {
- new->regexp = ap_pregcomp(cmd->pool, f, REG_EXTENDED);
- if (new->regexp == NULL)
- return "Regular expression could not be compiled.";
- }
-
- new->fake = f;
- new->real = r;
- new->handler = cmd->info;
-
- return NULL;
- }
-
- static const char *add_alias(cmd_parms *cmd, void *dummy, char *f, char *r)
- {
- return add_alias_internal(cmd, dummy, f, r, 0);
- }
-
- static const char *add_alias_regex(cmd_parms *cmd, void *dummy, char *f, char *r)
- {
- return add_alias_internal(cmd, dummy, f, r, 1);
- }
-
- static const char *add_redirect_internal(cmd_parms *cmd, alias_dir_conf * dirconf,
- char *arg1, char *arg2, char *arg3,
- int use_regex)
- {
- alias_entry *new;
- server_rec *s = cmd->server;
- alias_server_conf *serverconf =
- (alias_server_conf *) ap_get_module_config(s->module_config, &alias_module);
- int status = (int) (long) cmd->info;
- regex_t *r = NULL;
- char *f = arg2;
- char *url = arg3;
-
- if (!strcasecmp(arg1, "gone"))
- status = HTTP_GONE;
- else if (!strcasecmp(arg1, "permanent"))
- status = HTTP_MOVED_PERMANENTLY;
- else if (!strcasecmp(arg1, "temp"))
- status = HTTP_MOVED_TEMPORARILY;
- else if (!strcasecmp(arg1, "seeother"))
- status = HTTP_SEE_OTHER;
- else if (ap_isdigit(*arg1))
- status = atoi(arg1);
- else {
- f = arg1;
- url = arg2;
- }
-
- if (use_regex) {
- r = ap_pregcomp(cmd->pool, f, REG_EXTENDED);
- if (r == NULL)
- return "Regular expression could not be compiled.";
- }
-
- if (ap_is_HTTP_REDIRECT(status)) {
- if (!url)
- return "URL to redirect to is missing";
- if (!use_regex && !ap_is_url(url))
- return "Redirect to non-URL";
- }
- else {
- if (url)
- return "Redirect URL not valid for this status";
- }
-
- if (cmd->path)
- new = ap_push_array(dirconf->redirects);
- else
- new = ap_push_array(serverconf->redirects);
-
- new->fake = f;
- new->real = url;
- new->regexp = r;
- new->redir_status = status;
- return NULL;
- }
-
- static const char *add_redirect(cmd_parms *cmd, alias_dir_conf * dirconf, char *arg1,
- char *arg2, char *arg3)
- {
- return add_redirect_internal(cmd, dirconf, arg1, arg2, arg3, 0);
- }
-
- static const char *add_redirect_regex(cmd_parms *cmd, alias_dir_conf * dirconf,
- char *arg1, char *arg2, char *arg3)
- {
- return add_redirect_internal(cmd, dirconf, arg1, arg2, arg3, 1);
- }
-
- static const command_rec alias_cmds[] =
- {
- {"Alias", add_alias, NULL, RSRC_CONF, TAKE2,
- "a fakename and a realname"},
- {"ScriptAlias", add_alias, "cgi-script", RSRC_CONF, TAKE2,
- "a fakename and a realname"},
- {"Redirect", add_redirect, (void *) HTTP_MOVED_TEMPORARILY,
- OR_FILEINFO, TAKE23,
- "an optional status, then document to be redirected and destination URL"},
- {"AliasMatch", add_alias_regex, NULL, RSRC_CONF, TAKE2,
- "a regular expression and a filename"},
- {"ScriptAliasMatch", add_alias_regex, "cgi-script", RSRC_CONF, TAKE2,
- "a regular expression and a filename"},
- {"RedirectMatch", add_redirect_regex, (void *) HTTP_MOVED_TEMPORARILY,
- OR_FILEINFO, TAKE23,
- "an optional status, then a regular expression and destination URL"},
- {"RedirectTemp", add_redirect, (void *) HTTP_MOVED_TEMPORARILY,
- OR_FILEINFO, TAKE2,
- "a document to be redirected, then the destination URL"},
- {"RedirectPermanent", add_redirect, (void *) HTTP_MOVED_PERMANENTLY,
- OR_FILEINFO, TAKE2,
- "a document to be redirected, then the destination URL"},
- {NULL}
- };
-
- static int alias_matches(const char *uri, const char *alias_fakename)
- {
- const char *end_fakename = alias_fakename + strlen(alias_fakename);
- const char *aliasp = alias_fakename, *urip = uri;
-
- while (aliasp < end_fakename) {
- if (*aliasp == '/') {
- /* any number of '/' in the alias matches any number in
- * the supplied URI, but there must be at least one...
- */
- if (*urip != '/')
- return 0;
-
- while (*aliasp == '/')
- ++aliasp;
- while (*urip == '/')
- ++urip;
- }
- else {
- /* Other characters are compared literally */
- if (*urip++ != *aliasp++)
- return 0;
- }
- }
-
- /* Check last alias path component matched all the way */
-
- if (aliasp[-1] != '/' && *urip != '\0' && *urip != '/')
- return 0;
-
- /* Return number of characters from URI which matched (may be
- * greater than length of alias, since we may have matched
- * doubled slashes)
- */
-
- return urip - uri;
- }
-
- static char *try_alias_list(request_rec *r, array_header *aliases, int doesc, int *status)
- {
- alias_entry *entries = (alias_entry *) aliases->elts;
- regmatch_t regm[10];
- char *found = NULL;
- int i;
-
- for (i = 0; i < aliases->nelts; ++i) {
- alias_entry *p = &entries[i];
- int l;
-
- if (p->regexp) {
- if (!regexec(p->regexp, r->uri, p->regexp->re_nsub + 1, regm, 0)) {
- if (p->real) {
- found = ap_pregsub(r->pool, p->real, r->uri,
- p->regexp->re_nsub + 1, regm);
- if (found && doesc) {
- found = ap_escape_uri(r->pool, found);
- }
- }
- else {
- /* need something non-null */
- found = ap_pstrdup(r->pool, "");
- }
- }
- }
- else {
- l = alias_matches(r->uri, p->fake);
-
- if (l > 0) {
- if (doesc) {
- char *escurl;
- escurl = ap_os_escape_path(r->pool, r->uri + l, 1);
-
- found = ap_pstrcat(r->pool, p->real, escurl, NULL);
- }
- else
- found = ap_pstrcat(r->pool, p->real, r->uri + l, NULL);
- }
- }
-
- if (found) {
- if (p->handler) { /* Set handler, and leave a note for mod_cgi */
- r->handler = p->handler;
- ap_table_setn(r->notes, "alias-forced-type", r->handler);
- }
-
- *status = p->redir_status;
-
- return found;
- }
-
- }
-
- return NULL;
- }
-
- static int translate_alias_redir(request_rec *r)
- {
- void *sconf = r->server->module_config;
- alias_server_conf *serverconf =
- (alias_server_conf *) ap_get_module_config(sconf, &alias_module);
- char *ret;
- int status;
-
- if (r->uri[0] != '/' && r->uri[0] != '\0')
- return DECLINED;
-
- if ((ret = try_alias_list(r, serverconf->redirects, 1, &status)) != NULL) {
- if (ap_is_HTTP_REDIRECT(status)) {
- /* include QUERY_STRING if any */
- if (r->args) {
- ret = ap_pstrcat(r->pool, ret, "?", r->args, NULL);
- }
- ap_table_setn(r->headers_out, "Location", ret);
- }
- return status;
- }
-
- if ((ret = try_alias_list(r, serverconf->aliases, 0, &status)) != NULL) {
- r->filename = ret;
- return OK;
- }
-
- return DECLINED;
- }
-
- static int fixup_redir(request_rec *r)
- {
- void *dconf = r->per_dir_config;
- 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 (ap_is_HTTP_REDIRECT(status))
- ap_table_setn(r->headers_out, "Location", ret);
- return status;
- }
-
- return DECLINED;
- }
-
- module MODULE_VAR_EXPORT alias_module =
- {
- STANDARD_MODULE_STUFF,
- NULL, /* initializer */
- 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 table */
- NULL, /* handlers */
- translate_alias_redir, /* filename translation */
- NULL, /* check_user_id */
- NULL, /* check auth */
- NULL, /* check access */
- NULL, /* type_checker */
- fixup_redir, /* fixups */
- NULL, /* logger */
- NULL, /* header parser */
- NULL, /* child_init */
- NULL, /* child_exit */
- NULL /* post read-request */
- };
-