fix res_getservers search for mac/ios \n refresher always retry even in case of 403

configure.ac

@@ -105,9 +105,17 @@ AC_CHECK_DECL([antlr3StringStreamNew]
 		,[#include <antlr3.h>])
 libresolv_have_res_get_servers=no
 resolv_h_hav_res_ndestroy=no
-AC_CHECK_LIB([resolv], [res_getservers]
-		,[libresolv_have_res_get_servers=yes]
-		,[foo=bar])
+LIBS_save=$LIBS
+
+LIBS="$LIBS -lresolv"
+	
+AC_LINK_IFELSE([AC_LANG_PROGRAM([[#include <resolv.h>]],
+                      			[[res_getservers(NULL,NULL,0)]])]
+								,[libresolv_have_res_get_servers=yes
+									AC_MSG_NOTICE([res_getservers usable])]
+								,[LIBS=$LIBS_save
+									AC_MSG_WARN([res_getservers not usable])])
+			
 AC_CHECK_DECL([res_ndestroy]
 		,[resolv_h_hav_res_ndestroy=yes]
 		,[foo=bar]

src/refresher.c

@@ -233,7 +233,7 @@ static void process_response_event(belle_sip_listener_t *user_ctx, const belle_s
 	case 401:
 	case 407:
 		refresher->auth_failures++;
-		if (refresher->auth_failures>3){
+		if (refresher->auth_failures>1){
 			/*avoid looping with 407 or 401 */
 			belle_sip_warning("Authentication is failing constantly, %s",(refresher->target_expires>0)? "will retry later":"giving up.");
 			if (refresher->target_expires>0) retry_later(refresher);
@@ -245,6 +245,10 @@ static void process_response_event(belle_sip_listener_t *user_ctx, const belle_s
 		if (belle_sip_refresher_refresh_internal(refresher,refresher->target_expires,TRUE,&refresher->auth_events,NULL)==0)
 			return; /*ok, keep 401 internal*/
 		break; /*Else notify user of registration failure*/
+	case 403:
+		/*In case of 403, we will retry later, just in case*/
+		if (refresher->target_expires>0) retry_later(refresher);
+		break;
 	case 423:{
 		belle_sip_header_extension_t *min_expires=BELLE_SIP_HEADER_EXTENSION(belle_sip_message_get_header((belle_sip_message_t*)response,"Min-Expires"));
 		if (min_expires){