diff options
Diffstat (limited to 'modules/metadata/mod_env.c')
| -rw-r--r-- | modules/metadata/mod_env.c | 189 |
1 files changed, 189 insertions, 0 deletions
diff --git a/modules/metadata/mod_env.c b/modules/metadata/mod_env.c new file mode 100644 index 0000000..52594e9 --- /dev/null +++ b/modules/metadata/mod_env.c @@ -0,0 +1,189 @@ +/* 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 preceded 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, APLOGNO(01506) + "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_; + + if (ap_strchr_c(name, '=')) { + char *env, *plast; + + env = apr_strtok(apr_pstrdup(cmd->temp_pool, name), "=", &plast); + + ap_log_error(APLOG_MARK, APLOG_WARNING, 0, cmd->server, APLOGNO(10032) + "Spurious usage of '=' in an environment variable name. " + "'%s %s %s' expected instead?", cmd->cmd->name, env, plast); + } + + /* 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) +{ + env_dir_config_rec *sconf = ap_get_module_config(r->per_dir_config, + &env_module); + + if (apr_is_empty_table(sconf->vars)) { + return DECLINED; + } + + r->subprocess_env = apr_table_overlay(r->pool, r->subprocess_env, + sconf->vars); + + return OK; +} + +static void register_hooks(apr_pool_t *p) +{ + ap_hook_fixups(fixup_env_module, NULL, NULL, APR_HOOK_MIDDLE); +} + +AP_DECLARE_MODULE(env) = +{ + 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 */ +}; |