res/res_pjsip/config_global.c

   1 /*
   2  * Asterisk -- An open source telephony toolkit.
   3  *
   4  * Copyright (C) 2013, Digium, Inc.
   5  *
   6  * Mark Michelson <mmichelson@digium.com>
   7  *
   8  * See http://www.asterisk.org for more information about
   9  * the Asterisk project. Please do not directly contact
  10  * any of the maintainers of this project for assistance;
  11  * the project provides a web site, mailing lists and IRC
  12  * channels for your use.
  13  *
  14  * This program is free software, distributed under the terms of
  15  * the GNU General Public License Version 2. See the LICENSE file
  16  * at the top of the source tree.
  17  */
  18
  19 #include "asterisk.h"
  20
  21 #include <pjsip.h>
  22 #include <pjlib.h>
  23
  24 #include "asterisk/res_pjsip.h"
  25 #include "asterisk/sorcery.h"
  26 #include "asterisk/ast_version.h"
  27
  28 #define DEFAULT_MAX_FORWARDS 70
  29 #define DEFAULT_USERAGENT_PREFIX "Asterisk PBX"
  30
  31 static char default_useragent[128];
  32
  33 struct global_config {
  34         SORCERY_OBJECT(details);
  35         AST_DECLARE_STRING_FIELDS(
  36                 AST_STRING_FIELD(useragent);
  37         );
  38         /* Value to put in Max-Forwards header */
  39         unsigned int max_forwards;
  40 };
  41
  42 static void global_destructor(void *obj)
  43 {
  44         struct global_config *cfg = obj;
  45
  46         ast_string_field_free_memory(cfg);
  47 }
  48
  49 static void *global_alloc(const char *name)
  50 {
  51         struct global_config *cfg = ast_sorcery_generic_alloc(sizeof(*cfg), global_destructor);
  52
  53         if (!cfg || ast_string_field_init(cfg, 64)) {
  54                 return NULL;
  55         }
  56
  57         return cfg;
  58 }
  59
  60 static int global_apply(const struct ast_sorcery *sorcery, void *obj)
  61 {
  62         struct global_config *cfg = obj;
  63         char max_forwards[10];
  64
  65         snprintf(max_forwards, sizeof(max_forwards), "%u", cfg->max_forwards);
  66
  67         ast_sip_add_global_request_header("Max-Forwards", max_forwards, 1);
  68         ast_sip_add_global_request_header("User-Agent", cfg->useragent, 1);
  69         ast_sip_add_global_response_header("Server", cfg->useragent, 1);
  70         return 0;
  71 }
  72
  73 int ast_sip_initialize_sorcery_global(struct ast_sorcery *sorcery)
  74 {
  75         snprintf(default_useragent, sizeof(default_useragent), "%s %s", DEFAULT_USERAGENT_PREFIX, ast_get_version());
  76
  77         ast_sorcery_apply_default(sorcery, "global", "config", "pjsip.conf,criteria=type=global");
  78
  79         if (ast_sorcery_object_register(sorcery, "global", global_alloc, NULL, global_apply)) {
  80                 return -1;
  81         }
  82
  83         ast_sorcery_object_field_register(sorcery, "global", "type", "", OPT_NOOP_T, 0, 0);
  84         ast_sorcery_object_field_register(sorcery, "global", "maxforwards", __stringify(DEFAULT_MAX_FORWARDS),
  85                         OPT_UINT_T, 0, FLDSET(struct global_config, max_forwards));
  86         ast_sorcery_object_field_register(sorcery, "global", "useragent", default_useragent,
  87                         OPT_STRINGFIELD_T, 0, STRFLDSET(struct global_config, useragent));
  88
  89         return 0;
  90 }