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/* Copyright 1999-2005 The Apache Software Foundation or its licensors, as
* applicable.
*
* Licensed 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.
*/
/*
* mod_actions.c: executes scripts based on MIME type or HTTP method
*
* by Alexei Kosut; based on mod_cgi.c, mod_mime.c and mod_includes.c,
* adapted by rst from original NCSA code by Rob McCool
*
* Usage instructions:
*
* Action mime/type /cgi-bin/script
*
* will activate /cgi-bin/script when a file of content type mime/type is
* requested. It sends the URL and file path of the requested document using
* the standard CGI PATH_INFO and PATH_TRANSLATED environment variables.
*
* Script PUT /cgi-bin/script
*
* will activate /cgi-bin/script when a request is received with the
* HTTP method "PUT". The available method names are defined in httpd.h.
* If the method is GET, the script will only be activated if the requested
* URI includes query information (stuff after a ?-mark).
*/
#include "apr_strings.h"
#define APR_WANT_STRFUNC
#include "apr_want.h"
#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_main.h"
#include "http_log.h"
#include "util_script.h"
typedef struct {
apr_table_t *action_types; /* Added with Action... */
const char *scripted[METHODS]; /* Added with Script... */
int configured; /* True if Action or Script has been
* called at least once
*/
} action_dir_config;
module AP_MODULE_DECLARE_DATA actions_module;
static void *create_action_dir_config(apr_pool_t *p, char *dummy)
{
action_dir_config *new =
(action_dir_config *) apr_pcalloc(p, sizeof(action_dir_config));
new->action_types = apr_table_make(p, 4);
return new;
}
static void *merge_action_dir_configs(apr_pool_t *p, void *basev, void *addv)
{
action_dir_config *base = (action_dir_config *) basev;
action_dir_config *add = (action_dir_config *) addv;
action_dir_config *new = (action_dir_config *) apr_palloc(p,
sizeof(action_dir_config));
int i;
new->action_types = apr_table_overlay(p, add->action_types,
base->action_types);
for (i = 0; i < METHODS; ++i) {
new->scripted[i] = add->scripted[i] ? add->scripted[i]
: base->scripted[i];
}
new->configured = (base->configured || add->configured);
return new;
}
static const char *add_action(cmd_parms *cmd, void *m_v,
const char *type, const char *script,
const char *option)
{
action_dir_config *m = (action_dir_config *)m_v;
if (option && strcasecmp(option, "virtual")) {
return apr_pstrcat(cmd->pool,
"unrecognized option '", option, "'", NULL);
}
apr_table_setn(m->action_types, type,
apr_pstrcat(cmd->pool, option ? "1" : "0", script, NULL));
m->configured = 1;
return NULL;
}
static const char *set_script(cmd_parms *cmd, void *m_v,
const char *method, const char *script)
{
action_dir_config *m = (action_dir_config *)m_v;
/* ap_method_register recognizes already registered methods,
* so don't bother to check its previous existence explicitely.
*/
int methnum = ap_method_register(cmd->pool, method);
if (methnum == M_TRACE) {
return "TRACE not allowed for Script";
}
else if (methnum == M_INVALID) {
return apr_pstrcat(cmd->pool, "Could not register method '", method,
"' for Script", NULL);
}
m->scripted[methnum] = script;
m->configured = 1;
return NULL;
}
static const command_rec action_cmds[] =
{
AP_INIT_TAKE23("Action", add_action, NULL, OR_FILEINFO,
"a media type followed by a script name"),
AP_INIT_TAKE2("Script", set_script, NULL, ACCESS_CONF | RSRC_CONF,
"a method followed by a script name"),
{NULL}
};
static int action_handler(request_rec *r)
{
action_dir_config *conf = (action_dir_config *)
ap_get_module_config(r->per_dir_config, &actions_module);
const char *t, *action;
const char *script;
int i;
if (!conf->configured) {
return DECLINED;
}
/* Note that this handler handles _all_ types, so handler is unchecked */
/* Set allowed stuff */
for (i = 0; i < METHODS; ++i) {
if (conf->scripted[i])
r->allowed |= (AP_METHOD_BIT << i);
}
/* First, check for the method-handling scripts */
if (r->method_number == M_GET) {
if (r->args)
script = conf->scripted[M_GET];
else
script = NULL;
}
else {
script = conf->scripted[r->method_number];
}
/* Check for looping, which can happen if the CGI script isn't */
if (script && r->prev && r->prev->prev)
return DECLINED;
/* Second, check for actions (which override the method scripts) */
action = r->handler ? r->handler :
ap_field_noparam(r->pool, r->content_type);
action = action ? action : ap_default_type(r);
if ((t = apr_table_get(conf->action_types, action))) {
if (*t++ == '0' && r->finfo.filetype == 0) {
ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r,
"File does not exist: %s", r->filename);
return HTTP_NOT_FOUND;
}
script = t;
/* propagate the handler name to the script
* (will be REDIRECT_HANDLER there)
*/
apr_table_setn(r->subprocess_env, "HANDLER", action);
}
if (script == NULL)
return DECLINED;
ap_internal_redirect_handler(apr_pstrcat(r->pool, script,
ap_escape_uri(r->pool, r->uri),
r->args ? "?" : NULL,
r->args, NULL), r);
return OK;
}
static void register_hooks(apr_pool_t *p)
{
ap_hook_handler(action_handler,NULL,NULL,APR_HOOK_LAST);
}
module AP_MODULE_DECLARE_DATA actions_module =
{
STANDARD20_MODULE_STUFF,
create_action_dir_config, /* dir config creater */
merge_action_dir_configs, /* dir merger --- default is to override */
NULL, /* server config */
NULL, /* merge server config */
action_cmds, /* command apr_table_t */
register_hooks /* register hooks */
};
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