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
  17 /*** MODULEINFO
  18         <depend>netsnmp</depend>
  19  ***/
  20
  21 #include "asterisk.h"
  22
  23 ASTERISK_FILE_VERSION(__FILE__, "$Revision$")
  24
  25 #include "asterisk/channel.h"
  26 #include "asterisk/module.h"
  27 #include "asterisk/logger.h"
  28 #include "asterisk/options.h"
  29
  30 #include "snmp/agent.h"
  31
  32 #define MODULE_DESCRIPTION      "SNMP [Sub]Agent for Asterisk"
  33
  34 int res_snmp_agentx_subagent;
  35 int res_snmp_dont_stop;
  36 int res_snmp_enabled;
  37
  38 static pthread_t thread = AST_PTHREADT_NULL;
  39
  40 static int load_config(void)
  41 {
  42         struct ast_variable *var;
  43         struct ast_config *cfg;
  44         char *cat;
  45
  46         res_snmp_enabled = 0;
  47         res_snmp_agentx_subagent = 1;
  48         cfg = ast_config_load("res_snmp.conf");
  49         if (!cfg) {
  50                 ast_log(LOG_WARNING, "Could not load res_snmp.conf\n");
  51                 return 0;
  52         }
  53         cat = ast_category_browse(cfg, NULL);
  54         while (cat) {
  55                 var = ast_variable_browse(cfg, cat);
  56
  57                 if (strcasecmp(cat, "general") == 0) {
  58                         while (var) {
  59                                 if (strcasecmp(var->name, "subagent") == 0) {
  60                                         if (ast_true(var->value))
  61                                                 res_snmp_agentx_subagent = 1;
  62                                         else if (ast_false(var->value))
  63                                                 res_snmp_agentx_subagent = 0;
  64                                         else {
  65                                                 ast_log(LOG_ERROR, "Value '%s' does not evaluate to true or false.\n", var->value);
  66                                                 ast_config_destroy(cfg);
  67                                                 return 1;
  68                                         }
  69                                 } else if (strcasecmp(var->name, "enabled") == 0) {
  70                                         res_snmp_enabled = ast_true(var->value);
  71                                 } else {
  72                                         ast_log(LOG_ERROR, "Unrecognized variable '%s' in category '%s'\n", var->name, cat);
  73                                         ast_config_destroy(cfg);
  74                                         return 1;
  75                                 }
  76                                 var = var->next;
  77                         }
  78                 } else {
  79                         ast_log(LOG_ERROR, "Unrecognized category '%s'\n", cat);
  80                         ast_config_destroy(cfg);
  81                         return 1;
  82                 }
  83
  84                 cat = ast_category_browse(cfg, cat);
  85         }
  86         ast_config_destroy(cfg);
  87         return 1;
  88 }
  89
  90 static int load_module(void)
  91 {
  92         if(!load_config())
  93                 return AST_MODULE_LOAD_DECLINE;
  94
  95         ast_verbose(VERBOSE_PREFIX_1 "Loading [Sub]Agent Module\n");
  96
  97         res_snmp_dont_stop = 1;
  98         if (res_snmp_enabled)
  99                 return ast_pthread_create_background(&thread, NULL, agent_thread, NULL);
 100         else
 101                 return 0;
 102 }
 103
 104 static int unload_module(void)
 105 {
 106         ast_verbose(VERBOSE_PREFIX_1 "Unloading [Sub]Agent Module\n");
 107
 108         res_snmp_dont_stop = 0;
 109         return ((thread != AST_PTHREADT_NULL) ? pthread_join(thread, NULL) : 0);
 110 }
 111
 112 AST_MODULE_INFO(ASTERISK_GPL_KEY, AST_MODFLAG_GLOBAL_SYMBOLS, "SNMP [Sub]Agent for Asterisk",
 113                 .load = load_module,
 114                 .unload = unload_module,
 115                 );