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res_rtp_asterisk: Automatically refresh stunaddr from DNS

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This allows the STUN server to change its IP address without having to
reload the res_rtp_asterisk module.

The refresh of the name resolution occurs first when the module is
loaded, then recurringly, slightly after the previous DNS answer TTL
expires.

ASTERISK-29508 #close

Change-Id: I7955a046293f913ba121bbd82153b04439e3465f
This commit is contained in:
Sebastien Duthil
2021-04-05 15:06:38 -04:00
committed by George Joseph
parent f01a0398f8
commit 6fbf55ac11
4 changed files with 137 additions and 9 deletions
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9
main/dns_recurring.c
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@@ -39,6 +39,11 @@
#include <arpa/nameser.h>
/* \brief Delay between TTL expiration and the next DNS query, to make sure the
resolver cache really expired. */
#define EXTRA_TTL 2
#define MAX_TTL ((INT_MAX - EXTRA_TTL) / 1000)
/*! \brief Destructor for a DNS query */
static void dns_query_recurring_destroy(void *data)
{
@@ -91,10 +96,10 @@ static void dns_query_recurring_resolution_callback(const struct ast_dns_query *
/* So.. if something has not externally cancelled this we can reschedule based on the TTL */
if (!recurring->cancelled) {
const struct ast_dns_result *result = ast_dns_query_get_result(query);
int ttl = MIN(ast_dns_result_get_lowest_ttl(result), INT_MAX / 1000);
int ttl = MIN(ast_dns_result_get_lowest_ttl(result), MAX_TTL);
if (ttl) {
recurring->timer = ast_sched_add(ast_dns_get_sched(), ttl * 1000, dns_query_recurring_scheduled_callback, ao2_bump(recurring));
recurring->timer = ast_sched_add(ast_dns_get_sched(), (ttl + EXTRA_TTL) * 1000, dns_query_recurring_scheduled_callback, ao2_bump(recurring));
if (recurring->timer < 0) {
/* It is impossible for this to be the last reference as the query has a reference to it */
ao2_ref(recurring, -1);