Wed Aug 15 01:24:24 2007

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 
00017 /*** MODULEINFO
00018    <depend>netsnmp</depend>
00019  ***/
00020 
00021 #include "asterisk.h"
00022 
00023 ASTERISK_FILE_VERSION(__FILE__, "$Revision: 67872 $")
00024 
00025 #include "asterisk/channel.h"
00026 #include "asterisk/module.h"
00027 #include "asterisk/logger.h"
00028 #include "asterisk/options.h"
00029 
00030 #include "snmp/agent.h"
00031 
00032 #define  MODULE_DESCRIPTION   "SNMP [Sub]Agent for Asterisk"
00033 
00034 int res_snmp_agentx_subagent;
00035 int res_snmp_dont_stop;
00036 int res_snmp_enabled;
00037 
00038 static pthread_t thread = AST_PTHREADT_NULL;
00039 
00040 static int load_config(void)
00041 {
00042    struct ast_variable *var;
00043    struct ast_config *cfg;
00044    char *cat;
00045 
00046    res_snmp_enabled = 0;
00047    res_snmp_agentx_subagent = 1;
00048    cfg = ast_config_load("res_snmp.conf");
00049    if (!cfg) {
00050       ast_log(LOG_WARNING, "Could not load res_snmp.conf\n");
00051       return 0;
00052    }
00053    cat = ast_category_browse(cfg, NULL);
00054    while (cat) {
00055       var = ast_variable_browse(cfg, cat);
00056 
00057       if (strcasecmp(cat, "general") == 0) {
00058          while (var) {
00059             if (strcasecmp(var->name, "subagent") == 0) {
00060                if (ast_true(var->value))
00061                   res_snmp_agentx_subagent = 1;
00062                else if (ast_false(var->value))
00063                   res_snmp_agentx_subagent = 0;
00064                else {
00065                   ast_log(LOG_ERROR, "Value '%s' does not evaluate to true or false.\n", var->value);
00066                   ast_config_destroy(cfg);
00067                   return 1;
00068                }
00069             } else if (strcasecmp(var->name, "enabled") == 0) {
00070                res_snmp_enabled = ast_true(var->value);
00071             } else {
00072                ast_log(LOG_ERROR, "Unrecognized variable '%s' in category '%s'\n", var->name, cat);
00073                ast_config_destroy(cfg);
00074                return 1;
00075             }
00076             var = var->next;
00077          }
00078       } else {
00079          ast_log(LOG_ERROR, "Unrecognized category '%s'\n", cat);
00080          ast_config_destroy(cfg);
00081          return 1;
00082       }
00083 
00084       cat = ast_category_browse(cfg, cat);
00085    }
00086    ast_config_destroy(cfg);
00087    return 1;
00088 }
00089 
00090 static int load_module(void)
00091 {
00092    if(!load_config())
00093       return AST_MODULE_LOAD_DECLINE;
00094 
00095    ast_verbose(VERBOSE_PREFIX_1 "Loading [Sub]Agent Module\n");
00096 
00097    res_snmp_dont_stop = 1;
00098    if (res_snmp_enabled)
00099       return ast_pthread_create_background(&thread, NULL, agent_thread, NULL);
00100    else
00101       return 0;
00102 }
00103 
00104 static int unload_module(void)
00105 {
00106    ast_verbose(VERBOSE_PREFIX_1 "Unloading [Sub]Agent Module\n");
00107 
00108    res_snmp_dont_stop = 0;
00109    return ((thread != AST_PTHREADT_NULL) ? pthread_join(thread, NULL) : 0);
00110 }
00111 
00112 AST_MODULE_INFO(ASTERISK_GPL_KEY, AST_MODFLAG_GLOBAL_SYMBOLS, "SNMP [Sub]Agent for Asterisk",
00113       .load = load_module,
00114       .unload = unload_module,
00115       );

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