50044fdc15
Many uses of stasis_unsubscribe in modules can be reached through unload. These have been switched to stasis_unsubscribe_and_join. Some subscription callbacks do nothing, for these I've created a noop callback function in stasis.c. This is used by some modules that monitor MWI topics in order to enable cache, since the callback does not become invalid after dlclose it is safe to use stasis_unsubscribe on these, even during module unload. ASTERISK-25121 #close Change-Id: Ifc2549fbd8eef7d703c222978e8f452e2972189c
166 lines
4 KiB
C
166 lines
4 KiB
C
/*
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* Asterisk -- An open source telephony toolkit.
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*
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* Copyright (C) 2009, Digium, Inc.
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*
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* Russell Bryant <russell@digium.com>
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*
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* See http://www.asterisk.org for more information about
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* the Asterisk project. Please do not directly contact
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* any of the maintainers of this project for assistance;
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* the project provides a web site, mailing lists and IRC
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* channels for your use.
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*
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* This program is free software, distributed under the terms of
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* the GNU General Public License Version 2. See the LICENSE file
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* at the top of the source tree.
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*/
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/*!
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* \file
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*
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* \author Russell Bryant <russell@digium.com>
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*
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* \brief Security Event Logging
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*
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* \todo Make informational security events optional
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* \todo Escape quotes in string payload IE contents
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*/
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/*** MODULEINFO
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<support_level>core</support_level>
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***/
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#include "asterisk.h"
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ASTERISK_REGISTER_FILE();
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#include "asterisk/module.h"
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#include "asterisk/logger.h"
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#include "asterisk/threadstorage.h"
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#include "asterisk/strings.h"
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#include "asterisk/security_events.h"
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#include "asterisk/stasis.h"
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#include "asterisk/json.h"
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static const char LOG_SECURITY_NAME[] = "SECURITY";
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static int LOG_SECURITY;
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static struct stasis_subscription *security_stasis_sub;
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AST_THREADSTORAGE(security_event_buf);
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static const size_t SECURITY_EVENT_BUF_INIT_LEN = 256;
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enum ie_required {
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NOT_REQUIRED,
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REQUIRED
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};
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static void append_json_single(struct ast_str **str, struct ast_json *json,
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const enum ast_event_ie_type ie_type, enum ie_required required)
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{
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const char *ie_type_key = ast_event_get_ie_type_name(ie_type);
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struct ast_json *json_string;
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json_string = ast_json_object_get(json, ie_type_key);
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if (!required && !json_string) {
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/* Optional IE isn't present. Ignore. */
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return;
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}
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/* At this point, it _better_ be there! */
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ast_assert(json_string != NULL);
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ast_str_append(str, 0, ",%s=\"%s\"",
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ie_type_key,
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ast_json_string_get(json_string));
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}
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static void append_json(struct ast_str **str, struct ast_json *json,
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const struct ast_security_event_ie_type *ies, enum ie_required required)
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{
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unsigned int i;
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for (i = 0; ies[i].ie_type != AST_EVENT_IE_END; i++) {
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append_json_single(str, json, ies[i].ie_type, required);
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}
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}
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static void security_event_stasis_cb(struct ast_json *json)
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{
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struct ast_str *str;
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struct ast_json *event_type_json;
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enum ast_security_event_type event_type;
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event_type_json = ast_json_object_get(json, "SecurityEvent");
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event_type = ast_json_integer_get(event_type_json);
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ast_assert((unsigned int)event_type < AST_SECURITY_EVENT_NUM_TYPES);
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if (!(str = ast_str_thread_get(&security_event_buf,
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SECURITY_EVENT_BUF_INIT_LEN))) {
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return;
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}
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ast_str_set(&str, 0, "SecurityEvent=\"%s\"",
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ast_security_event_get_name(event_type));
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append_json(&str, json,
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ast_security_event_get_required_ies(event_type), REQUIRED);
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append_json(&str, json,
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ast_security_event_get_optional_ies(event_type), NOT_REQUIRED);
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ast_log_dynamic_level(LOG_SECURITY, "%s\n", ast_str_buffer(str));
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}
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static void security_stasis_cb(void *data, struct stasis_subscription *sub,
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struct stasis_message *message)
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{
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struct ast_json_payload *payload = stasis_message_data(message);
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if (stasis_message_type(message) != ast_security_event_type()) {
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return;
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}
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if (!payload) {
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return;
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}
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security_event_stasis_cb(payload->json);
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}
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static int load_module(void)
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{
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if ((LOG_SECURITY = ast_logger_register_level(LOG_SECURITY_NAME)) == -1) {
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return AST_MODULE_LOAD_DECLINE;
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}
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if (!(security_stasis_sub = stasis_subscribe(ast_security_topic(), security_stasis_cb, NULL))) {
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ast_logger_unregister_level(LOG_SECURITY_NAME);
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LOG_SECURITY = -1;
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return AST_MODULE_LOAD_DECLINE;
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}
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ast_verb(3, "Security Logging Enabled\n");
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return AST_MODULE_LOAD_SUCCESS;
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}
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static int unload_module(void)
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{
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if (security_stasis_sub) {
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security_stasis_sub = stasis_unsubscribe_and_join(security_stasis_sub);
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}
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ast_logger_unregister_level(LOG_SECURITY_NAME);
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ast_verb(3, "Security Logging Disabled\n");
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return 0;
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}
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AST_MODULE_INFO_STANDARD(ASTERISK_GPL_KEY, "Security Event Logging");
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