#include <sys/types.h>
#include <netinet/in.h>
#include <sys/socket.h>
#include <arpa/inet.h>
#include <resolv.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include <stdlib.h>
#include <regex.h>
#include <signal.h>
#include "asterisk.h"
#include "asterisk/dnsmgr.h"
#include "asterisk/linkedlists.h"
#include "asterisk/utils.h"
#include "asterisk/config.h"
#include "asterisk/logger.h"
#include "asterisk/sched.h"
#include "asterisk/options.h"
#include "asterisk/cli.h"
Include dependency graph for dnsmgr.c:
Go to the source code of this file.
Defines | |
| #define | REFRESH_DEFAULT 300 |
Functions | |
| ast_dnsmgr_entry * | ast_dnsmgr_get (const char *name, struct in_addr *result) |
| int | ast_dnsmgr_lookup (const char *name, struct in_addr *result, struct ast_dnsmgr_entry **dnsmgr) |
| void | ast_dnsmgr_release (struct ast_dnsmgr_entry *entry) |
| static | AST_LIST_HEAD_STATIC (entry_list, ast_dnsmgr_entry) |
| AST_MUTEX_DEFINE_STATIC (refresh_lock) | |
| int | dnsmgr_init (void) |
| void | dnsmgr_reload (void) |
| void | dnsmgr_start_refresh (void) |
| static void * | do_refresh (void *data) |
| static int | do_reload (int loading) |
| static int | handle_cli_refresh (int fd, int argc, char *argv[]) |
| static int | handle_cli_reload (int fd, int argc, char *argv[]) |
| static int | handle_cli_status (int fd, int argc, char *argv[]) |
| static int | refresh_list (void *data) |
Variables | |
| static struct ast_cli_entry | cli_refresh |
| static struct ast_cli_entry | cli_reload |
| static struct ast_cli_entry | cli_status |
| static int | enabled = 0 |
| static struct refresh_info | master_refresh_info |
| static int | refresh_interval |
| static int | refresh_sched = -1 |
| static pthread_t | refresh_thread = AST_PTHREADT_NULL |
| static struct sched_context * | sched |
Definition in file dnsmgr.c.
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Definition at line 64 of file dnsmgr.c. Referenced by do_reload(). |
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Definition at line 81 of file dnsmgr.c. References AST_LIST_INSERT_HEAD, AST_LIST_LOCK, AST_LIST_UNLOCK, ast_strlen_zero(), calloc, and list. Referenced by ast_dnsmgr_lookup(). 00082 {
00083 struct ast_dnsmgr_entry *entry;
00084
00085 if (!result || ast_strlen_zero(name))
00086 return NULL;
00087
00088 entry = calloc(1, sizeof(*entry) + strlen(name));
00089 if (!entry)
00090 return NULL;
00091
00092 entry->result = result;
00093 strcpy(entry->name, name);
00094
00095 AST_LIST_LOCK(&entry_list);
00096 AST_LIST_INSERT_HEAD(&entry_list, entry, list);
00097 AST_LIST_UNLOCK(&entry_list);
00098
00099 return entry;
00100 }
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Definition at line 113 of file dnsmgr.c. References ast_dnsmgr_get(), ast_gethostbyname(), ast_strlen_zero(), ast_verbose(), enabled, hp, option_verbose, VERBOSE_PREFIX_2, and VERBOSE_PREFIX_3. Referenced by build_peer(). 00114 {
00115 if (ast_strlen_zero(name) || !result || !dnsmgr)
00116 return -1;
00117
00118 if (*dnsmgr && !strcasecmp((*dnsmgr)->name, name))
00119 return 0;
00120
00121 if (option_verbose > 3)
00122 ast_verbose(VERBOSE_PREFIX_3 "doing lookup for '%s'\n", name);
00123
00124 /* if it's actually an IP address and not a name,
00125 there's no need for a managed lookup */
00126 if (inet_aton(name, result))
00127 return 0;
00128
00129 /* if the manager is disabled, do a direct lookup and return the result,
00130 otherwise register a managed lookup for the name */
00131 if (!enabled) {
00132 struct ast_hostent ahp;
00133 struct hostent *hp;
00134
00135 if ((hp = ast_gethostbyname(name, &ahp)))
00136 memcpy(result, hp->h_addr, sizeof(result));
00137 return 0;
00138 } else {
00139 if (option_verbose > 2)
00140 ast_verbose(VERBOSE_PREFIX_2 "adding manager for '%s'\n", name);
00141 *dnsmgr = ast_dnsmgr_get(name, result);
00142 return !*dnsmgr;
00143 }
00144 }
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Definition at line 102 of file dnsmgr.c. References AST_LIST_LOCK, AST_LIST_REMOVE, AST_LIST_UNLOCK, free, and list. Referenced by destroy_peer(), and sip_destroy_peer(). 00103 {
00104 if (!entry)
00105 return;
00106
00107 AST_LIST_LOCK(&entry_list);
00108 AST_LIST_REMOVE(&entry_list, entry, list);
00109 AST_LIST_UNLOCK(&entry_list);
00110 free(entry);
00111 }
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Definition at line 285 of file dnsmgr.c. References ast_cli_register(), ast_log(), do_reload(), LOG_ERROR, and sched_context_create(). Referenced by main(). 00286 {
00287 sched = sched_context_create();
00288 if (!sched) {
00289 ast_log(LOG_ERROR, "Unable to create schedule context.\n");
00290 return -1;
00291 }
00292 ast_cli_register(&cli_reload);
00293 ast_cli_register(&cli_status);
00294 return do_reload(1);
00295 }
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Definition at line 297 of file dnsmgr.c. References do_reload(). Referenced by ast_module_reload(). 00298 {
00299 do_reload(0);
00300 }
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Definition at line 194 of file dnsmgr.c. References ast_sched_add_variable(), ast_sched_del(), refresh_list(), and refresh_sched. Referenced by main(). 00195 {
00196 if (refresh_sched > -1) {
00197 ast_sched_del(sched, refresh_sched);
00198 refresh_sched = ast_sched_add_variable(sched, 100, refresh_list, &master_refresh_info, 1);
00199 }
00200 }
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Definition at line 146 of file dnsmgr.c. References ast_sched_runq(), and ast_sched_wait(). Referenced by do_reload(). 00147 {
00148 for (;;) {
00149 pthread_testcancel();
00150 usleep(ast_sched_wait(sched));
00151 pthread_testcancel();
00152 ast_sched_runq(sched);
00153 }
00154 return NULL;
00155 }
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Definition at line 302 of file dnsmgr.c. References ast_cli_register(), ast_cli_unregister(), ast_config_destroy(), ast_config_load(), ast_log(), ast_mutex_lock(), ast_mutex_unlock(), ast_pthread_create, AST_PTHREADT_NULL, ast_sched_add_variable(), ast_sched_del(), ast_true(), ast_variable_retrieve(), config, do_refresh(), enabled, LOG_ERROR, LOG_NOTICE, LOG_WARNING, REFRESH_DEFAULT, refresh_interval, refresh_list(), refresh_sched, and refresh_thread. 00303 {
00304 struct ast_config *config;
00305 const char *interval_value;
00306 const char *enabled_value;
00307 int interval;
00308 int was_enabled;
00309 int res = -1;
00310
00311 /* ensure that no refresh cycles run while the reload is in progress */
00312 ast_mutex_lock(&refresh_lock);
00313
00314 /* reset defaults in preparation for reading config file */
00315 refresh_interval = REFRESH_DEFAULT;
00316 was_enabled = enabled;
00317 enabled = 0;
00318
00319 if (refresh_sched > -1)
00320 ast_sched_del(sched, refresh_sched);
00321
00322 if ((config = ast_config_load("dnsmgr.conf"))) {
00323 if ((enabled_value = ast_variable_retrieve(config, "general", "enable"))) {
00324 enabled = ast_true(enabled_value);
00325 }
00326 if ((interval_value = ast_variable_retrieve(config, "general", "refreshinterval"))) {
00327 if (sscanf(interval_value, "%d", &interval) < 1)
00328 ast_log(LOG_WARNING, "Unable to convert '%s' to a numeric value.\n", interval_value);
00329 else if (interval < 0)
00330 ast_log(LOG_WARNING, "Invalid refresh interval '%d' specified, using default\n", interval);
00331 else
00332 refresh_interval = interval;
00333 }
00334 ast_config_destroy(config);
00335 }
00336
00337 if (enabled && refresh_interval)
00338 ast_log(LOG_NOTICE, "Managed DNS entries will be refreshed every %d seconds.\n", refresh_interval);
00339
00340 /* if this reload enabled the manager, create the background thread
00341 if it does not exist */
00342 if (enabled && !was_enabled && (refresh_thread == AST_PTHREADT_NULL)) {
00343 if (ast_pthread_create(&refresh_thread, NULL, do_refresh, NULL) < 0) {
00344 ast_log(LOG_ERROR, "Unable to start refresh thread.\n");
00345 }
00346 else {
00347 ast_cli_register(&cli_refresh);
00348 /* make a background refresh happen right away */
00349 refresh_sched = ast_sched_add_variable(sched, 100, refresh_list, &master_refresh_info, 1);
00350 res = 0;
00351 }
00352 }
00353 /* if this reload disabled the manager and there is a background thread,
00354 kill it */
00355 else if (!enabled && was_enabled && (refresh_thread != AST_PTHREADT_NULL)) {
00356 /* wake up the thread so it will exit */
00357 pthread_cancel(refresh_thread);
00358 pthread_kill(refresh_thread, SIGURG);
00359 pthread_join(refresh_thread, NULL);
00360 refresh_thread = AST_PTHREADT_NULL;
00361 ast_cli_unregister(&cli_refresh);
00362 res = 0;
00363 }
00364 else
00365 res = 0;
00366
00367 ast_mutex_unlock(&refresh_lock);
00368
00369 return res;
00370 }
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Definition at line 213 of file dnsmgr.c. References refresh_info::entries, refresh_info::filter, refresh_list(), refresh_info::regex_present, and RESULT_SHOWUSAGE. 00214 {
00215 struct refresh_info info = {
00216 .entries = &entry_list,
00217 .verbose = 1,
00218 };
00219
00220 if (argc > 3)
00221 return RESULT_SHOWUSAGE;
00222
00223 if (argc == 3) {
00224 if (regcomp(&info.filter, argv[2], REG_EXTENDED | REG_NOSUB))
00225 return RESULT_SHOWUSAGE;
00226 else
00227 info.regex_present = 1;
00228 }
00229
00230 refresh_list(&info);
00231
00232 if (info.regex_present)
00233 regfree(&info.filter);
00234
00235 return 0;
00236 }
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Definition at line 204 of file dnsmgr.c. References do_reload(), and RESULT_SHOWUSAGE. 00205 {
00206 if (argc > 2)
00207 return RESULT_SHOWUSAGE;
00208
00209 do_reload(0);
00210 return 0;
00211 }
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Definition at line 238 of file dnsmgr.c. References ast_cli(), AST_LIST_LOCK, AST_LIST_TRAVERSE, AST_LIST_UNLOCK, enabled, list, refresh_interval, and RESULT_SHOWUSAGE. 00239 {
00240 int count = 0;
00241 struct ast_dnsmgr_entry *entry;
00242
00243 if (argc > 2)
00244 return RESULT_SHOWUSAGE;
00245
00246 ast_cli(fd, "DNS Manager: %s\n", enabled ? "enabled" : "disabled");
00247 ast_cli(fd, "Refresh Interval: %d seconds\n", refresh_interval);
00248 AST_LIST_LOCK(&entry_list);
00249 AST_LIST_TRAVERSE(&entry_list, entry, list)
00250 count++;
00251 AST_LIST_UNLOCK(&entry_list);
00252 ast_cli(fd, "Number of entries: %d\n", count);
00253
00254 return 0;
00255 }
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Definition at line 157 of file dnsmgr.c. References ast_gethostbyname(), AST_LIST_LOCK, AST_LIST_TRAVERSE, AST_LIST_UNLOCK, ast_log(), ast_mutex_trylock(), ast_mutex_unlock(), ast_verbose(), refresh_info::entries, refresh_info::filter, hp, list, LOG_WARNING, option_verbose, refresh_interval, refresh_info::regex_present, ast_dnsmgr_entry::result, refresh_info::verbose, and VERBOSE_PREFIX_2. Referenced by dnsmgr_start_refresh(), do_reload(), and handle_cli_refresh(). 00158 {
00159 struct refresh_info *info = data;
00160 struct ast_dnsmgr_entry *entry;
00161 struct ast_hostent ahp;
00162 struct hostent *hp;
00163
00164 /* if a refresh or reload is already in progress, exit now */
00165 if (ast_mutex_trylock(&refresh_lock)) {
00166 if (info->verbose)
00167 ast_log(LOG_WARNING, "DNS Manager refresh already in progress.\n");
00168 return -1;
00169 }
00170
00171 if (option_verbose > 2)
00172 ast_verbose(VERBOSE_PREFIX_2 "Refreshing DNS lookups.\n");
00173 AST_LIST_LOCK(info->entries);
00174 AST_LIST_TRAVERSE(info->entries, entry, list) {
00175 if (info->regex_present && regexec(&info->filter, entry->name, 0, NULL, 0))
00176 continue;
00177
00178 if (info->verbose && (option_verbose > 2))
00179 ast_verbose(VERBOSE_PREFIX_2 "refreshing '%s'\n", entry->name);
00180
00181 if ((hp = ast_gethostbyname(entry->name, &ahp))) {
00182 /* check to see if it has changed, do callback if requested */
00183 memcpy(entry->result, hp->h_addr, sizeof(entry->result));
00184 }
00185 }
00186 AST_LIST_UNLOCK(info->entries);
00187
00188 ast_mutex_unlock(&refresh_lock);
00189
00190 /* automatically reschedule based on the interval */
00191 return refresh_interval * 1000;
00192 }
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Initial value: {
.entries = &entry_list,
.verbose = 0,
}
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Definition at line 67 of file dnsmgr.c. Referenced by do_reload(), handle_cli_status(), and refresh_list(). |
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Definition at line 51 of file dnsmgr.c. Referenced by dnsmgr_start_refresh(), and do_reload(). |
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Definition at line 52 of file dnsmgr.c. Referenced by do_reload(). |
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1.4.2