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/* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You 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.
*/
#include "apr.h"
#include "apr_strings.h"
#if APR_HAVE_STDLIB_H
#include <stdlib.h>
#endif
#include "ap_config.h"
#include "httpd.h"
#include "http_config.h"
#include "http_request.h"
#include "http_log.h"
typedef struct {
apr_table_t *vars;
apr_table_t *unsetenv;
} env_dir_config_rec;
module AP_MODULE_DECLARE_DATA env_module;
static void *create_env_dir_config(apr_pool_t *p, char *dummy)
{
env_dir_config_rec *conf = apr_palloc(p, sizeof(*conf));
conf->vars = apr_table_make(p, 10);
conf->unsetenv = apr_table_make(p, 10);
return conf;
}
static void *merge_env_dir_configs(apr_pool_t *p, void *basev, void *addv)
{
env_dir_config_rec *base = basev;
env_dir_config_rec *add = addv;
env_dir_config_rec *res = apr_palloc(p, sizeof(*res));
const apr_table_entry_t *elts;
const apr_array_header_t *arr;
int i;
/*
* res->vars = copy_table( p, base->vars );
* foreach $unsetenv ( @add->unsetenv )
* table_unset( res->vars, $unsetenv );
* foreach $element ( @add->vars )
* table_set( res->vars, $element.key, $element.val );
*
* add->unsetenv already removed the vars from add->vars,
* if they preceeded the UnsetEnv directive.
*/
res->vars = apr_table_copy(p, base->vars);
res->unsetenv = NULL;
arr = apr_table_elts(add->unsetenv);
if (arr) {
elts = (const apr_table_entry_t *)arr->elts;
for (i = 0; i < arr->nelts; ++i) {
apr_table_unset(res->vars, elts[i].key);
}
}
arr = apr_table_elts(add->vars);
if (arr) {
elts = (const apr_table_entry_t *)arr->elts;
for (i = 0; i < arr->nelts; ++i) {
apr_table_setn(res->vars, elts[i].key, elts[i].val);
}
}
return res;
}
static const char *add_env_module_vars_passed(cmd_parms *cmd, void *sconf_,
const char *arg)
{
env_dir_config_rec *sconf = sconf_;
apr_table_t *vars = sconf->vars;
const char *env_var;
env_var = getenv(arg);
if (env_var != NULL) {
apr_table_setn(vars, arg, apr_pstrdup(cmd->pool, env_var));
}
else {
ap_log_error(APLOG_MARK, APLOG_WARNING, 0, cmd->server,
"PassEnv variable %s was undefined", arg);
}
return NULL;
}
static const char *add_env_module_vars_set(cmd_parms *cmd, void *sconf_,
const char *name, const char *value)
{
env_dir_config_rec *sconf = sconf_;
/* name is mandatory, value is optional. no value means
* set the variable to an empty string
*/
apr_table_setn(sconf->vars, name, value ? value : "");
return NULL;
}
static const char *add_env_module_vars_unset(cmd_parms *cmd, void *sconf_,
const char *arg)
{
env_dir_config_rec *sconf = sconf_;
/* Always UnsetEnv FOO in the same context as {Set,Pass}Env FOO
* only if this UnsetEnv follows the {Set,Pass}Env. The merge
* will only apply unsetenv to the parent env (main server).
*/
apr_table_set(sconf->unsetenv, arg, NULL);
apr_table_unset(sconf->vars, arg);
return NULL;
}
static const command_rec env_module_cmds[] =
{
AP_INIT_ITERATE("PassEnv", add_env_module_vars_passed, NULL,
OR_FILEINFO, "a list of environment variables to pass to CGI."),
AP_INIT_TAKE12("SetEnv", add_env_module_vars_set, NULL,
OR_FILEINFO, "an environment variable name and optional value to pass to CGI."),
AP_INIT_ITERATE("UnsetEnv", add_env_module_vars_unset, NULL,
OR_FILEINFO, "a list of variables to remove from the CGI environment."),
{NULL},
};
static int fixup_env_module(request_rec *r)
{
apr_table_t *e = r->subprocess_env;
env_dir_config_rec *sconf = ap_get_module_config(r->per_dir_config,
&env_module);
apr_table_t *vars = sconf->vars;
if (!apr_table_elts(sconf->vars)->nelts)
return DECLINED;
r->subprocess_env = apr_table_overlay(r->pool, e, vars);
return OK;
}
static void register_hooks(apr_pool_t *p)
{
ap_hook_fixups(fixup_env_module, NULL, NULL, APR_HOOK_MIDDLE);
}
module AP_MODULE_DECLARE_DATA env_module =
{
STANDARD20_MODULE_STUFF,
create_env_dir_config, /* dir config creater */
merge_env_dir_configs, /* dir merger --- default is to override */
NULL, /* server config */
NULL, /* merge server configs */
env_module_cmds, /* command apr_table_t */
register_hooks /* register hooks */
};
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