res_pjsip_session: properly handle SDP from a forked call with early media
[asterisk/asterisk.git] / 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  * Uses the Net-SNMP libraries available at
17  *       http://net-snmp.sourceforge.net/
18  */
19
20 /*! \li \ref res_snmp.c uses the configuration file \ref res_snmp.conf
21  * \addtogroup configuration_file Configuration Files
22  */
23
24 /*!
25  * \page res_snmp.conf res_snmp.conf
26  * \verbinclude res_snmp.conf.sample
27  */
28
29 /*** MODULEINFO
30         <depend>netsnmp</depend>
31         <support_level>extended</support_level>
32  ***/
33
34 #include "asterisk.h"
35
36 #include "asterisk/channel.h"
37 #include "asterisk/module.h"
38
39 #include "snmp/agent.h"
40
41 #define MODULE_DESCRIPTION      "SNMP [Sub]Agent for Asterisk"
42
43 int res_snmp_agentx_subagent;
44 int res_snmp_dont_stop;
45 static int res_snmp_enabled;
46
47 static pthread_t thread = AST_PTHREADT_NULL;
48
49 /*!
50  * \brief Load res_snmp.conf config file
51  * \return 1 on load, 0 file does not exist
52 */
53 static int load_config(void)
54 {
55         struct ast_variable *var;
56         struct ast_config *cfg;
57         struct ast_flags config_flags = { 0 };
58         char *cat;
59
60         res_snmp_enabled = 0;
61         res_snmp_agentx_subagent = 1;
62         cfg = ast_config_load("res_snmp.conf", config_flags);
63         if (cfg == CONFIG_STATUS_FILEMISSING || cfg == CONFIG_STATUS_FILEINVALID) {
64                 ast_log(LOG_WARNING, "Could not load res_snmp.conf\n");
65                 return 0;
66         }
67         cat = ast_category_browse(cfg, NULL);
68         while (cat) {
69                 var = ast_variable_browse(cfg, cat);
70
71                 if (strcasecmp(cat, "general") == 0) {
72                         while (var) {
73                                 if (strcasecmp(var->name, "subagent") == 0) {
74                                         if (ast_true(var->value))
75                                                 res_snmp_agentx_subagent = 1;
76                                         else if (ast_false(var->value))
77                                                 res_snmp_agentx_subagent = 0;
78                                         else {
79                                                 ast_log(LOG_ERROR, "Value '%s' does not evaluate to true or false.\n", var->value);
80                                                 ast_config_destroy(cfg);
81                                                 return 1;
82                                         }
83                                 } else if (strcasecmp(var->name, "enabled") == 0) {
84                                         res_snmp_enabled = ast_true(var->value);
85                                 } else {
86                                         ast_log(LOG_ERROR, "Unrecognized variable '%s' in category '%s'\n", var->name, cat);
87                                         ast_config_destroy(cfg);
88                                         return 1;
89                                 }
90                                 var = var->next;
91                         }
92                 } else {
93                         ast_log(LOG_ERROR, "Unrecognized category '%s'\n", cat);
94                         ast_config_destroy(cfg);
95                         return 1;
96                 }
97
98                 cat = ast_category_browse(cfg, cat);
99         }
100         ast_config_destroy(cfg);
101         return 1;
102 }
103
104 /*!
105  * \brief Load the module
106  *
107  * Module loading including tests for configuration or dependencies.
108  * This function can return AST_MODULE_LOAD_FAILURE, AST_MODULE_LOAD_DECLINE,
109  * or AST_MODULE_LOAD_SUCCESS. If a dependency or environment variable fails
110  * tests return AST_MODULE_LOAD_FAILURE. If the module can not load the
111  * configuration file or other non-critical problem return
112  * AST_MODULE_LOAD_DECLINE. On success return AST_MODULE_LOAD_SUCCESS.
113  */
114 static int load_module(void)
115 {
116         if(!load_config())
117                 return AST_MODULE_LOAD_DECLINE;
118
119         ast_verb(1, "Loading [Sub]Agent Module\n");
120
121         res_snmp_dont_stop = 1;
122         if (res_snmp_enabled)
123                 return ast_pthread_create_background(&thread, NULL, agent_thread, NULL);
124         else
125                 return 0;
126 }
127
128 static int unload_module(void)
129 {
130         ast_verb(1, "Unloading [Sub]Agent Module\n");
131
132         res_snmp_dont_stop = 0;
133         return ((thread != AST_PTHREADT_NULL) ? pthread_join(thread, NULL) : 0);
134 }
135
136 AST_MODULE_INFO(ASTERISK_GPL_KEY, AST_MODFLAG_DEFAULT, "SNMP [Sub]Agent for Asterisk",
137         .support_level = AST_MODULE_SUPPORT_EXTENDED,
138         .load = load_module,
139         .unload = unload_module,
140 );