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* Copyright (c) 1995-1997 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
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*
* 1. Redistributions of source code must retain the above copyright
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*
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* 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/)."
*
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* endorse or promote products derived from this software without
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*
* 5. 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/)."
*
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* ====================================================================
*
* 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;
void *create_alias_config (pool *p, server_rec *s)
{
alias_server_conf *a =
(alias_server_conf *)pcalloc (p, sizeof(alias_server_conf));
a->aliases = make_array (p, 20, sizeof(alias_entry));
a->redirects = make_array (p, 20, sizeof(alias_entry));
return a;
}
void *create_alias_dir_config (pool *p, char *d)
{
alias_dir_conf *a =
(alias_dir_conf *)pcalloc (p, sizeof(alias_dir_conf));
a->redirects = make_array (p, 2, sizeof(alias_entry));
return a;
}
void *merge_alias_config (pool *p, void *basev, void *overridesv)
{
alias_server_conf *a =
(alias_server_conf *)pcalloc (p, sizeof(alias_server_conf));
alias_server_conf *base = (alias_server_conf *)basev,
*overrides = (alias_server_conf *)overridesv;
a->aliases = append_arrays (p, overrides->aliases, base->aliases);
a->redirects = append_arrays (p, overrides->redirects, base->redirects);
return a;
}
void *merge_alias_dir_config (pool *p, void *basev, void *overridesv)
{
alias_dir_conf *a =
(alias_dir_conf *)pcalloc (p, sizeof(alias_dir_conf));
alias_dir_conf *base = (alias_dir_conf *)basev,
*overrides = (alias_dir_conf *)overridesv;
a->redirects = append_arrays (p, overrides->redirects, base->redirects);
return a;
}
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 *)get_module_config(s->module_config,&alias_module);
alias_entry *new = push_array (conf->aliases);
/* XX r can NOT be relative to DocumentRoot here... compat bug. */
if (use_regex) {
new->regexp = 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;
}
const char *add_alias(cmd_parms *cmd, void *dummy, char *f, char *r) {
return add_alias_internal(cmd, dummy, f, r, 0);
}
const char *add_alias_regex(cmd_parms *cmd, void *dummy, char *f, char *r) {
return add_alias_internal(cmd, dummy, f, r, 1);
}
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 *)get_module_config(s->module_config,&alias_module);
int status = (int)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 (isdigit(*arg1))
status = atoi(arg1);
else {
f = arg1;
url = arg2;
}
if (use_regex) {
r = pregcomp(cmd->pool, f, REG_EXTENDED);
if (r == NULL)
return "Regular expression could not be compiled.";
}
if (is_HTTP_REDIRECT(status)) {
if (!url) return "URL to redirect to is missing";
if (!is_url (url)) return "Redirect to non-URL";
}
else {
if (url) return "Redirect URL not valid for this status";
}
if ( cmd->path )
new = push_array (dirconf->redirects);
else
new = push_array (serverconf->redirects);
new->fake = f; new->real = url; new->regexp = r;
new->redir_status = status;
return NULL;
}
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);
}
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);
}
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 }
};
int alias_matches (char *uri, char *alias_fakename)
{
char *end_fakename = alias_fakename + strlen (alias_fakename);
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;
}
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))
found = pregsub(r->pool, p->real, r->uri,
p->regexp->re_nsub+1, regm);
}
else {
l = alias_matches (r->uri, p->fake);
if (l > 0) {
if (doesc) {
char *escurl;
escurl = os_escape_path(r->pool, r->uri + l, 1);
found = pstrcat(r->pool, p->real, escurl, NULL);
} else
found = 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 = pstrdup(r->pool, p->handler);
table_set (r->notes, "alias-forced-type", p->handler);
}
*status = p->redir_status;
return found;
}
}
return NULL;
}
int translate_alias_redir(request_rec *r)
{
void *sconf = r->server->module_config;
alias_server_conf *serverconf =
(alias_server_conf *)get_module_config(sconf, &alias_module);
char *ret;
int status;
#if defined(__EMX__) || defined(WIN32)
/* Add support for OS/2 drive names */
if ((r->uri[0] != '/' && r->uri[0] != '\0') && r->uri[1] != ':')
#else
if (r->uri[0] != '/' && r->uri[0] != '\0')
#endif
return DECLINED;
if ((ret = try_alias_list (r, serverconf->redirects, 1, &status)) != NULL) {
if (is_HTTP_REDIRECT(status)) {
/* include QUERY_STRING if any */
if (r->args) {
ret = pstrcat (r->pool, ret, "?", r->args, NULL);
}
table_set (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;
}
int fixup_redir(request_rec *r)
{
void *dconf = r->per_dir_config;
alias_dir_conf *dirconf =
(alias_dir_conf *)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 (is_HTTP_REDIRECT(status))
table_set (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 */
};
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