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/*
* Copyright (C) 2006 Voop as
* Thorsten Lockert <tholo@voop.as>
*
* This program is free software, distributed under the terms of
* the GNU General Public License Version 2. See the LICENSE file
* at the top of the source tree.
*/
/*! \file
*
* \brief SNMP Agent / SubAgent support for Asterisk
*
* \author Thorsten Lockert <tholo@voop.as>
*
* Uses the Net-SNMP libraries available at
* http://net-snmp.sourceforge.net/
*/
/*! \li \ref res_snmp.c uses the configuration file \ref res_snmp.conf
* \addtogroup configuration_file Configuration Files
*/
/*!
* \page res_snmp.conf res_snmp.conf
* \verbinclude res_snmp.conf.sample
*/
/*** MODULEINFO
<depend>netsnmp</depend>
<support_level>extended</support_level>
***/
#include "asterisk.h"
#include "asterisk/channel.h"
#include "asterisk/module.h"
#include "snmp/agent.h"
#define MODULE_DESCRIPTION "SNMP [Sub]Agent for Asterisk"
int res_snmp_agentx_subagent;
int res_snmp_dont_stop;
static int res_snmp_enabled;
static pthread_t thread = AST_PTHREADT_NULL;
/*!
* \brief Load res_snmp.conf config file
* \return 1 on load, 0 file does not exist
*/
static int load_config(void)
{
struct ast_variable *var;
struct ast_config *cfg;
struct ast_flags config_flags = { 0 };
char *cat;
res_snmp_enabled = 0;
res_snmp_agentx_subagent = 1;
cfg = ast_config_load("res_snmp.conf", config_flags);
if (cfg == CONFIG_STATUS_FILEMISSING || cfg == CONFIG_STATUS_FILEINVALID) {
ast_log(LOG_WARNING, "Could not load res_snmp.conf\n");
return 0;
}
cat = ast_category_browse(cfg, NULL);
while (cat) {
var = ast_variable_browse(cfg, cat);
if (strcasecmp(cat, "general") == 0) {
while (var) {
if (strcasecmp(var->name, "subagent") == 0) {
if (ast_true(var->value))
res_snmp_agentx_subagent = 1;
else if (ast_false(var->value))
res_snmp_agentx_subagent = 0;
else {
ast_log(LOG_ERROR, "Value '%s' does not evaluate to true or false.\n", var->value);
ast_config_destroy(cfg);
return 1;
}
} else if (strcasecmp(var->name, "enabled") == 0) {
res_snmp_enabled = ast_true(var->value);
} else {
ast_log(LOG_ERROR, "Unrecognized variable '%s' in category '%s'\n", var->name, cat);
ast_config_destroy(cfg);
return 1;
}
var = var->next;
}
} else {
ast_log(LOG_ERROR, "Unrecognized category '%s'\n", cat);
ast_config_destroy(cfg);
return 1;
}
cat = ast_category_browse(cfg, cat);
}
ast_config_destroy(cfg);
return 1;
}
/*!
* \brief Load the module
*
* Module loading including tests for configuration or dependencies.
* This function can return AST_MODULE_LOAD_FAILURE, AST_MODULE_LOAD_DECLINE,
* or AST_MODULE_LOAD_SUCCESS. If a dependency or environment variable fails
* tests return AST_MODULE_LOAD_FAILURE. If the module can not load the
* configuration file or other non-critical problem return
* AST_MODULE_LOAD_DECLINE. On success return AST_MODULE_LOAD_SUCCESS.
*/
static int load_module(void)
{
if(!load_config())
return AST_MODULE_LOAD_DECLINE;
ast_verb(1, "Loading [Sub]Agent Module\n");
res_snmp_dont_stop = 1;
if (res_snmp_enabled)
return ast_pthread_create_background(&thread, NULL, agent_thread, NULL);
else
return 0;
}
static int unload_module(void)
{
ast_verb(1, "Unloading [Sub]Agent Module\n");
res_snmp_dont_stop = 0;
return ((thread != AST_PTHREADT_NULL) ? pthread_join(thread, NULL) : 0);
}
AST_MODULE_INFO(ASTERISK_GPL_KEY, AST_MODFLAG_DEFAULT, "SNMP [Sub]Agent for Asterisk",
.support_level = AST_MODULE_SUPPORT_EXTENDED,
.load = load_module,
.unload = unload_module,
);
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