Enable DNS NAPTR+SRV+A

DNS lookup for proxy: Works for NAPTR+SRV+A. Socket transport address:port updated according to the DNS lookup.

res/res_pjsip/pjsip_resolver.c

@@ -544,49 +544,47 @@ static void sip_resolve(pjsip_resolver_t *resolver, pj_pool_t *pool, const pjsip
 
 	ast_debug(2, "[%p] Created resolution tracking for target '%s'\n", resolve, host);
 
-	/* If no port has been specified we can do NAPTR + SRV */
-	if (!target->addr.port) {
-		char srv[NI_MAXHOST];
-
-		/* When resolving addresses PJSIP can request an explicit transport type. It will explicitly
-		 * request an IPv6 transport if a message has been tagged to use an explicitly IPv6 transport.
-		 * For other cases it can be left unspecified OR an explicit non-IPv6 transport can be requested.
-		 * In the case where a non-IPv6 transport is requested there is no way to differentiate between
-		 * a transport being requested as part of a SIP URI (sip:test.com;transport=tcp) and a message
-		 * being tagged with a specific IPv4 transport. In this case we look for both IPv4 and IPv6 addresses.
-		 * If a message has been tagged with a specific IPv4 transport the IPv6 addresses will simply
-		 * be discarded. The code below and elsewhere handles the case where we know they requested IPv6
-		 * explicitly and only looks for IPv6 records.
-		 */
+	/* NAPTR + SRV */
+	char srv[NI_MAXHOST];
+
+	/* When resolving addresses PJSIP can request an explicit transport type. It will explicitly
+	 * request an IPv6 transport if a message has been tagged to use an explicitly IPv6 transport.
+	 * For other cases it can be left unspecified OR an explicit non-IPv6 transport can be requested.
+	 * In the case where a non-IPv6 transport is requested there is no way to differentiate between
+	 * a transport being requested as part of a SIP URI (sip:test.com;transport=tcp) and a message
+	 * being tagged with a specific IPv4 transport. In this case we look for both IPv4 and IPv6 addresses.
+	 * If a message has been tagged with a specific IPv4 transport the IPv6 addresses will simply
+	 * be discarded. The code below and elsewhere handles the case where we know they requested IPv6
+	 * explicitly and only looks for IPv6 records.
+	 */
 
-		res |= sip_resolve_add(resolve, host, T_NAPTR, C_IN, type, 0);
+	res |= sip_resolve_add(resolve, host, T_NAPTR, C_IN, type, 0);
 
-		if (type == PJSIP_TRANSPORT_UNSPECIFIED ||
-			(type == PJSIP_TRANSPORT_TLS && sip_transport_is_available(PJSIP_TRANSPORT_TLS)) ||
-			(type == PJSIP_TRANSPORT_TLS6 && sip_transport_is_available(PJSIP_TRANSPORT_TLS6))) {
-			if (snprintf(srv, sizeof(srv), "_sips._tcp.%s", host) < NI_MAXHOST) {
-				res |= sip_resolve_add(resolve, srv, T_SRV, C_IN,
-					type == PJSIP_TRANSPORT_UNSPECIFIED ? PJSIP_TRANSPORT_TLS : type, 0);
-			}
+	if (type == PJSIP_TRANSPORT_UNSPECIFIED ||
+		(type == PJSIP_TRANSPORT_TLS && sip_transport_is_available(PJSIP_TRANSPORT_TLS)) ||
+		(type == PJSIP_TRANSPORT_TLS6 && sip_transport_is_available(PJSIP_TRANSPORT_TLS6))) {
+		if (snprintf(srv, sizeof(srv), "_sips._tcp.%s", host) < NI_MAXHOST) {
+			res |= sip_resolve_add(resolve, srv, T_SRV, C_IN,
+				type == PJSIP_TRANSPORT_UNSPECIFIED ? PJSIP_TRANSPORT_TLS : type, 0);
 		}
-		if (type == PJSIP_TRANSPORT_UNSPECIFIED ||
-			(type == PJSIP_TRANSPORT_TCP && sip_transport_is_available(PJSIP_TRANSPORT_TCP)) ||
-			(type == PJSIP_TRANSPORT_TCP6 && sip_transport_is_available(PJSIP_TRANSPORT_TCP6))) {
-			if (snprintf(srv, sizeof(srv), "_sip._tcp.%s", host) < NI_MAXHOST) {
-				res |= sip_resolve_add(resolve, srv, T_SRV, C_IN,
-					type == PJSIP_TRANSPORT_UNSPECIFIED ? PJSIP_TRANSPORT_TCP : type, 0);
-			}
+	}
+	if (type == PJSIP_TRANSPORT_UNSPECIFIED ||
+		(type == PJSIP_TRANSPORT_TCP && sip_transport_is_available(PJSIP_TRANSPORT_TCP)) ||
+		(type == PJSIP_TRANSPORT_TCP6 && sip_transport_is_available(PJSIP_TRANSPORT_TCP6))) {
+		if (snprintf(srv, sizeof(srv), "_sip._tcp.%s", host) < NI_MAXHOST) {
+			res |= sip_resolve_add(resolve, srv, T_SRV, C_IN,
+				type == PJSIP_TRANSPORT_UNSPECIFIED ? PJSIP_TRANSPORT_TCP : type, 0);
 		}
-		if (type == PJSIP_TRANSPORT_UNSPECIFIED ||
-			(type == PJSIP_TRANSPORT_UDP && sip_transport_is_available(PJSIP_TRANSPORT_UDP)) ||
-			(type == PJSIP_TRANSPORT_UDP6 && sip_transport_is_available(PJSIP_TRANSPORT_UDP6))) {
-			if (snprintf(srv, sizeof(srv), "_sip._udp.%s", host) < NI_MAXHOST) {
-				res |= sip_resolve_add(resolve, srv, T_SRV, C_IN,
-					type == PJSIP_TRANSPORT_UNSPECIFIED ? PJSIP_TRANSPORT_UDP : type, 0);
-			}
+	}
+	if (type == PJSIP_TRANSPORT_UNSPECIFIED ||
+		(type == PJSIP_TRANSPORT_UDP && sip_transport_is_available(PJSIP_TRANSPORT_UDP)) ||
+		(type == PJSIP_TRANSPORT_UDP6 && sip_transport_is_available(PJSIP_TRANSPORT_UDP6))) {
+		if (snprintf(srv, sizeof(srv), "_sip._udp.%s", host) < NI_MAXHOST) {
+			res |= sip_resolve_add(resolve, srv, T_SRV, C_IN,
+				type == PJSIP_TRANSPORT_UNSPECIFIED ? PJSIP_TRANSPORT_UDP : type, 0);
 		}
 	}
-
+	/* AAAA + A */
 	if ((type == PJSIP_TRANSPORT_UNSPECIFIED && sip_transport_is_available(PJSIP_TRANSPORT_UDP6)) ||
 		((type & PJSIP_TRANSPORT_IPV6) && sip_transport_is_available(type))) {
 		res |= sip_resolve_add(resolve, host, T_AAAA, C_IN, (type == PJSIP_TRANSPORT_UNSPECIFIED ? PJSIP_TRANSPORT_UDP6 : type), target->addr.port);