res/res_pjsip/config_system.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 "include/res_pjsip_private.h"
  27 #include "asterisk/threadpool.h"
  28 #include "asterisk/dns.h"
  29
  30 #define TIMER_T1_MIN 100
  31 #define DEFAULT_TIMER_T1 500
  32 #define DEFAULT_TIMER_B 32000
  33
  34 struct system_config {
  35         SORCERY_OBJECT(details);
  36         /*! Transaction Timer T1 value */
  37         unsigned int timert1;
  38         /*! Transaction Timer B value */
  39         unsigned int timerb;
  40         /*! Should we use short forms for headers? */
  41         unsigned int compactheaders;
  42         struct {
  43                 /*! Initial number of threads in the threadpool */
  44                 int initial_size;
  45                 /*! The amount by which the number of threads is incremented when necessary */
  46                 int auto_increment;
  47                 /*! Thread idle timeout in seconds */
  48                 int idle_timeout;
  49                 /*! Maxumum number of threads in the threadpool */
  50                 int max_size;
  51         } threadpool;
  52 };
  53
  54 static struct ast_threadpool_options sip_threadpool_options = {
  55         .version = AST_THREADPOOL_OPTIONS_VERSION,
  56 };
  57
  58 void sip_get_threadpool_options(struct ast_threadpool_options *threadpool_options)
  59 {
  60         *threadpool_options = sip_threadpool_options;
  61 }
  62
  63 static struct ast_sorcery *system_sorcery;
  64
  65 static void *system_alloc(const char *name)
  66 {
  67         struct system_config *system = ast_sorcery_generic_alloc(sizeof(*system), NULL);
  68
  69         if (!system) {
  70                 return NULL;
  71         }
  72
  73         return system;
  74 }
  75
  76 static int system_apply(const struct ast_sorcery *system_sorcery, void *obj)
  77 {
  78         struct system_config *system = obj;
  79         int min_timerb;
  80
  81         if (system->timert1 < TIMER_T1_MIN) {
  82                 ast_log(LOG_WARNING, "Timer T1 setting is too low. Setting to %d\n", TIMER_T1_MIN);
  83                 system->timert1 = TIMER_T1_MIN;
  84         }
  85
  86         min_timerb = 64 * system->timert1;
  87
  88         if (system->timerb < min_timerb) {
  89                 ast_log(LOG_WARNING, "Timer B setting is too low. Setting to %d\n", min_timerb);
  90                 system->timerb = min_timerb;
  91         }
  92
  93         pjsip_cfg()->tsx.t1 = system->timert1;
  94         pjsip_cfg()->tsx.td = system->timerb;
  95
  96         if (system->compactheaders) {
  97                 extern pj_bool_t pjsip_use_compact_form;
  98                 pjsip_use_compact_form = PJ_TRUE;
  99         }
 100
 101         sip_threadpool_options.initial_size = system->threadpool.initial_size;
 102         sip_threadpool_options.auto_increment = system->threadpool.auto_increment;
 103         sip_threadpool_options.idle_timeout = system->threadpool.idle_timeout;
 104         sip_threadpool_options.max_size = system->threadpool.max_size;
 105
 106         return 0;
 107 }
 108
 109 int ast_sip_initialize_system(void)
 110 {
 111         RAII_VAR(struct ao2_container *, system_configs, NULL, ao2_cleanup);
 112         RAII_VAR(struct system_config *, system, NULL, ao2_cleanup);
 113
 114         system_sorcery = ast_sorcery_open();
 115         if (!system_sorcery) {
 116                 ast_log(LOG_ERROR, "Failed to open SIP system sorcery\n");
 117                 return -1;
 118         }
 119
 120         ast_sorcery_apply_config(system_sorcery, "res_pjsip");
 121
 122         ast_sorcery_apply_default(system_sorcery, "system", "config", "pjsip.conf,criteria=type=system");
 123
 124         if (ast_sorcery_object_register_no_reload(system_sorcery, "system", system_alloc, NULL, system_apply)) {
 125                 ast_log(LOG_ERROR, "Failed to register with sorcery (is res_sorcery_config loaded?)\n");
 126                 ast_sorcery_unref(system_sorcery);
 127                 system_sorcery = NULL;
 128                 return -1;
 129         }
 130
 131         ast_sorcery_object_field_register(system_sorcery, "system", "type", "", OPT_NOOP_T, 0, 0);
 132         ast_sorcery_object_field_register(system_sorcery, "system", "timer_t1", __stringify(DEFAULT_TIMER_T1),
 133                         OPT_UINT_T, 0, FLDSET(struct system_config, timert1));
 134         ast_sorcery_object_field_register(system_sorcery, "system", "timer_b", __stringify(DEFAULT_TIMER_B),
 135                         OPT_UINT_T, 0, FLDSET(struct system_config, timerb));
 136         ast_sorcery_object_field_register(system_sorcery, "system", "compact_headers", "no",
 137                         OPT_BOOL_T, 1, FLDSET(struct system_config, compactheaders));
 138         ast_sorcery_object_field_register(system_sorcery, "system", "threadpool_initial_size", "0",
 139                         OPT_UINT_T, 0, FLDSET(struct system_config, threadpool.initial_size));
 140         ast_sorcery_object_field_register(system_sorcery, "system", "threadpool_auto_increment", "5",
 141                         OPT_UINT_T, 0, FLDSET(struct system_config, threadpool.auto_increment));
 142         ast_sorcery_object_field_register(system_sorcery, "system", "threadpool_idle_timeout", "60",
 143                         OPT_UINT_T, 0, FLDSET(struct system_config, threadpool.idle_timeout));
 144         ast_sorcery_object_field_register(system_sorcery, "system", "threadpool_max_size", "0",
 145                         OPT_UINT_T, 0, FLDSET(struct system_config, threadpool.max_size));
 146
 147         ast_sorcery_load(system_sorcery);
 148
 149         system_configs = ast_sorcery_retrieve_by_fields(system_sorcery, "system",
 150                 AST_RETRIEVE_FLAG_MULTIPLE | AST_RETRIEVE_FLAG_ALL, NULL);
 151
 152         if (ao2_container_count(system_configs)) {
 153                 return 0;
 154         }
 155
 156         /* No config present, allocate one and apply defaults */
 157         system = ast_sorcery_alloc(system_sorcery, "system", NULL);
 158         if (!system) {
 159                 ast_log(LOG_ERROR, "Unable to allocate default system config.\n");
 160                 ast_sorcery_unref(system_sorcery);
 161                 return -1;
 162         }
 163
 164         if (system_apply(system_sorcery, system)) {
 165                 ast_log(LOG_ERROR, "Failed to apply default system config.\n");
 166                 ast_sorcery_unref(system_sorcery);
 167                 return -1;
 168         }
 169
 170         return 0;
 171 }
 172
 173 void ast_sip_destroy_system(void)
 174 {
 175         ast_sorcery_unref(system_sorcery);
 176 }
 177
 178 static int system_create_resolver_and_set_nameservers(void *data)
 179 {
 180         struct ao2_container *discovered_nameservers;
 181         struct ao2_iterator it_nameservers;
 182         char *nameserver;
 183         pj_status_t status;
 184         pj_dns_resolver *resolver;
 185         pj_str_t nameservers[PJ_DNS_RESOLVER_MAX_NS];
 186         unsigned int count = 0;
 187
 188         discovered_nameservers = ast_dns_get_nameservers();
 189         if (!discovered_nameservers) {
 190                 ast_log(LOG_ERROR, "Could not retrieve local system nameservers, resorting to system resolution\n");
 191                 return 0;
 192         }
 193
 194         if (!ao2_container_count(discovered_nameservers)) {
 195                 ast_log(LOG_ERROR, "There are no local system nameservers configured, resorting to system resolution\n");
 196                 ao2_ref(discovered_nameservers, -1);
 197                 return -1;
 198         }
 199
 200         if (!(resolver = pjsip_endpt_get_resolver(ast_sip_get_pjsip_endpoint()))) {
 201                 status = pjsip_endpt_create_resolver(ast_sip_get_pjsip_endpoint(), &resolver);
 202                 if (status != PJ_SUCCESS) {
 203                         ast_log(LOG_ERROR, "Could not create DNS resolver(%d), resorting to system resolution\n", status);
 204                         return 0;
 205                 }
 206         }
 207
 208         it_nameservers = ao2_iterator_init(discovered_nameservers, 0);
 209         while ((nameserver = ao2_iterator_next(&it_nameservers))) {
 210                 pj_strset2(&nameservers[count++], nameserver);
 211                 ao2_ref(nameserver, -1);
 212
 213                 if (count == (PJ_DNS_RESOLVER_MAX_NS - 1)) {
 214                         break;
 215                 }
 216         }
 217         ao2_iterator_destroy(&it_nameservers);
 218
 219         status = pj_dns_resolver_set_ns(resolver, count, nameservers, NULL);
 220
 221         /* Since we no longer need the nameservers we can drop the list of them */
 222         ao2_ref(discovered_nameservers, -1);
 223
 224         if (status != PJ_SUCCESS) {
 225                 ast_log(LOG_ERROR, "Could not set nameservers on DNS resolver in PJSIP(%d), resorting to system resolution\n",
 226                         status);
 227                 return 0;
 228         }
 229
 230         if (!pjsip_endpt_get_resolver(ast_sip_get_pjsip_endpoint())) {
 231                 status = pjsip_endpt_set_resolver(ast_sip_get_pjsip_endpoint(), resolver);
 232                 if (status != PJ_SUCCESS) {
 233                         ast_log(LOG_ERROR, "Could not set DNS resolver in PJSIP(%d), resorting to system resolution\n", status);
 234                         return 0;
 235                 }
 236         }
 237
 238         return 0;
 239 }
 240
 241 void ast_sip_initialize_dns(void)
 242 {
 243         ast_sip_push_task_synchronous(NULL, system_create_resolver_and_set_nameservers, NULL);
 244 }