Fri Aug 17 00:17:19 2018

Asterisk developer's documentation


res_snmp.c

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00001 /*
00002  * Copyright (C) 2006 Voop as
00003  * Thorsten Lockert <tholo@voop.as>
00004  *
00005  * This program is free software, distributed under the terms of
00006  * the GNU General Public License Version 2. See the LICENSE file
00007  * at the top of the source tree.
00008  */
00009 
00010 /*! \file
00011  *
00012  * \brief SNMP Agent / SubAgent support for Asterisk
00013  *
00014  * \author Thorsten Lockert <tholo@voop.as>
00015  *
00016  * \extref Uses the Net-SNMP libraries available at
00017  *  http://net-snmp.sourceforge.net/
00018  */
00019 
00020 /*** MODULEINFO
00021    <depend>netsnmp</depend>
00022    <support_level>extended</support_level>
00023  ***/
00024 
00025 #include "asterisk.h"
00026 
00027 ASTERISK_FILE_VERSION(__FILE__, "$Revision: 328209 $")
00028 
00029 #include "asterisk/channel.h"
00030 #include "asterisk/module.h"
00031 
00032 #include "snmp/agent.h"
00033 
00034 #define  MODULE_DESCRIPTION   "SNMP [Sub]Agent for Asterisk"
00035 
00036 int res_snmp_agentx_subagent;
00037 int res_snmp_dont_stop;
00038 static int res_snmp_enabled;
00039 
00040 static pthread_t thread = AST_PTHREADT_NULL;
00041 
00042 /*!
00043  * \brief Load res_snmp.conf config file
00044  * \return 1 on load, 0 file does not exist
00045 */
00046 static int load_config(void)
00047 {
00048    struct ast_variable *var;
00049    struct ast_config *cfg;
00050    struct ast_flags config_flags = { 0 };
00051    char *cat;
00052 
00053    res_snmp_enabled = 0;
00054    res_snmp_agentx_subagent = 1;
00055    cfg = ast_config_load("res_snmp.conf", config_flags);
00056    if (cfg == CONFIG_STATUS_FILEMISSING || cfg == CONFIG_STATUS_FILEINVALID) {
00057       ast_log(LOG_WARNING, "Could not load res_snmp.conf\n");
00058       return 0;
00059    }
00060    cat = ast_category_browse(cfg, NULL);
00061    while (cat) {
00062       var = ast_variable_browse(cfg, cat);
00063 
00064       if (strcasecmp(cat, "general") == 0) {
00065          while (var) {
00066             if (strcasecmp(var->name, "subagent") == 0) {
00067                if (ast_true(var->value))
00068                   res_snmp_agentx_subagent = 1;
00069                else if (ast_false(var->value))
00070                   res_snmp_agentx_subagent = 0;
00071                else {
00072                   ast_log(LOG_ERROR, "Value '%s' does not evaluate to true or false.\n", var->value);
00073                   ast_config_destroy(cfg);
00074                   return 1;
00075                }
00076             } else if (strcasecmp(var->name, "enabled") == 0) {
00077                res_snmp_enabled = ast_true(var->value);
00078             } else {
00079                ast_log(LOG_ERROR, "Unrecognized variable '%s' in category '%s'\n", var->name, cat);
00080                ast_config_destroy(cfg);
00081                return 1;
00082             }
00083             var = var->next;
00084          }
00085       } else {
00086          ast_log(LOG_ERROR, "Unrecognized category '%s'\n", cat);
00087          ast_config_destroy(cfg);
00088          return 1;
00089       }
00090 
00091       cat = ast_category_browse(cfg, cat);
00092    }
00093    ast_config_destroy(cfg);
00094    return 1;
00095 }
00096 
00097 static int load_module(void)
00098 {
00099    if(!load_config())
00100       return AST_MODULE_LOAD_DECLINE;
00101 
00102    ast_verb(1, "Loading [Sub]Agent Module\n");
00103 
00104    res_snmp_dont_stop = 1;
00105    if (res_snmp_enabled)
00106       return ast_pthread_create_background(&thread, NULL, agent_thread, NULL);
00107    else
00108       return 0;
00109 }
00110 
00111 static int unload_module(void)
00112 {
00113    ast_verb(1, "Unloading [Sub]Agent Module\n");
00114 
00115    res_snmp_dont_stop = 0;
00116    return ((thread != AST_PTHREADT_NULL) ? pthread_join(thread, NULL) : 0);
00117 }
00118 
00119 AST_MODULE_INFO(ASTERISK_GPL_KEY, AST_MODFLAG_DEFAULT, "SNMP [Sub]Agent for Asterisk",
00120       .load = load_module,
00121       .unload = unload_module,
00122       );

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