Use system ephemeral ports for default portset

In dispatch, use system ephemeral ports for default portset instead of
hardcoded <1024,65535> range.

diff --git a/lib/dns/dispatch.c b/lib/dns/dispatch.c
index 3e0daa02f2cbaad4f4eaaed078f22b0d39e92f9b..633915cd30dc91dc9f5e75410e9cac42fe0be5a3 100644 (file)
--- a/lib/dns/dispatch.c
+++ b/lib/dns/dispatch.c
@@ -20,6 +20,7 @@
 #include <isc/atomic.h>
 #include <isc/mem.h>
 #include <isc/mutex.h>
+#include <isc/net.h>
 #include <isc/netmgr.h>
 #include <isc/portset.h>
 #include <isc/print.h>
@@ -749,14 +750,18 @@ done:
 
 /*%
  * Create a temporary port list to set the initial default set of dispatch
- * ports: [1024, 65535].  This is almost meaningless as the application will
+ * ephemeral ports.  This is almost meaningless as the application will
  * normally set the ports explicitly, but is provided to fill some minor corner
  * cases.
  */
 static void
-create_default_portset(isc_mem_t *mctx, isc_portset_t **portsetp) {
+create_default_portset(isc_mem_t *mctx, int family, isc_portset_t **portsetp) {
+       in_port_t low, high;
+
+       isc_net_getudpportrange(family, &low, &high);
+
        isc_portset_create(mctx, portsetp);
-       isc_portset_addrange(*portsetp, 1024, 65535);
+       isc_portset_addrange(*portsetp, low, high);
 }
 
 static isc_result_t
@@ -832,8 +837,8 @@ dns_dispatchmgr_create(isc_mem_t *mctx, isc_nm_t *nm,
 
        ISC_LIST_INIT(mgr->list);
 
-       create_default_portset(mctx, &v4portset);
-       create_default_portset(mctx, &v6portset);
+       create_default_portset(mctx, AF_INET, &v4portset);
+       create_default_portset(mctx, AF_INET6, &v6portset);
 
        setavailports(mgr, v4portset, v6portset);