res/res_snmp.c

   1 /*
   2  * Copyright (C) 2006 Voop as
   3  * Thorsten Lockert <tholo@voop.as>
   4  *
   5  * This program is free software, distributed under the terms of
   6  * the GNU General Public License Version 2. See the LICENSE file
   7  * at the top of the source tree.
   8  */
   9
  10 /*! \file
  11  *
  12  * \brief SNMP Agent / SubAgent support for Asterisk
  13  *
  14  * \author Thorsten Lockert <tholo@voop.as>
  15  *
  16  * \extref Uses the Net-SNMP libraries available at
  17  *       http://net-snmp.sourceforge.net/
  18  */
  19
  20 /*** MODULEINFO
  21         <depend>netsnmp</depend>
  22  ***/
  23
  24 #include "asterisk.h"
  25
  26 ASTERISK_FILE_VERSION(__FILE__, "$Revision$")
  27
  28 #include "asterisk/channel.h"
  29 #include "asterisk/module.h"
  30
  31 #include "snmp/agent.h"
  32
  33 #define MODULE_DESCRIPTION      "SNMP [Sub]Agent for Asterisk"
  34
  35 int res_snmp_agentx_subagent;
  36 int res_snmp_dont_stop;
  37 int res_snmp_enabled;
  38
  39 static pthread_t thread = AST_PTHREADT_NULL;
  40
  41 /*!
  42  * \brief Load res_snmp.conf config file
  43  * \return 1 on load, 0 file does not exist
  44 */
  45 static int load_config(void)
  46 {
  47         struct ast_variable *var;
  48         struct ast_config *cfg;
  49         struct ast_flags config_flags = { 0 };
  50         char *cat;
  51
  52         res_snmp_enabled = 0;
  53         res_snmp_agentx_subagent = 1;
  54         cfg = ast_config_load("res_snmp.conf", config_flags);
  55         if (!cfg) {
  56                 ast_log(LOG_WARNING, "Could not load res_snmp.conf\n");
  57                 return 0;
  58         }
  59         cat = ast_category_browse(cfg, NULL);
  60         while (cat) {
  61                 var = ast_variable_browse(cfg, cat);
  62
  63                 if (strcasecmp(cat, "general") == 0) {
  64                         while (var) {
  65                                 if (strcasecmp(var->name, "subagent") == 0) {
  66                                         if (ast_true(var->value))
  67                                                 res_snmp_agentx_subagent = 1;
  68                                         else if (ast_false(var->value))
  69                                                 res_snmp_agentx_subagent = 0;
  70                                         else {
  71                                                 ast_log(LOG_ERROR, "Value '%s' does not evaluate to true or false.\n", var->value);
  72                                                 ast_config_destroy(cfg);
  73                                                 return 1;
  74                                         }
  75                                 } else if (strcasecmp(var->name, "enabled") == 0) {
  76                                         res_snmp_enabled = ast_true(var->value);
  77                                 } else {
  78                                         ast_log(LOG_ERROR, "Unrecognized variable '%s' in category '%s'\n", var->name, cat);
  79                                         ast_config_destroy(cfg);
  80                                         return 1;
  81                                 }
  82                                 var = var->next;
  83                         }
  84                 } else {
  85                         ast_log(LOG_ERROR, "Unrecognized category '%s'\n", cat);
  86                         ast_config_destroy(cfg);
  87                         return 1;
  88                 }
  89
  90                 cat = ast_category_browse(cfg, cat);
  91         }
  92         ast_config_destroy(cfg);
  93         return 1;
  94 }
  95
  96 static int load_module(void)
  97 {
  98         if(!load_config())
  99                 return AST_MODULE_LOAD_DECLINE;
 100
 101         ast_verb(1, "Loading [Sub]Agent Module\n");
 102
 103         res_snmp_dont_stop = 1;
 104         if (res_snmp_enabled)
 105                 return ast_pthread_create_background(&thread, NULL, agent_thread, NULL);
 106         else
 107                 return 0;
 108 }
 109
 110 static int unload_module(void)
 111 {
 112         ast_verb(1, "Unloading [Sub]Agent Module\n");
 113
 114         res_snmp_dont_stop = 0;
 115         return ((thread != AST_PTHREADT_NULL) ? pthread_join(thread, NULL) : 0);
 116 }
 117
 118 AST_MODULE_INFO(ASTERISK_GPL_KEY, AST_MODFLAG_GLOBAL_SYMBOLS, "SNMP [Sub]Agent for Asterisk",
 119                 .load = load_module,
 120                 .unload = unload_module,
 121                 );