Use port number 0 for ephemeral port

Hopefully RFC-6056 is being applied. Fixes #63.
ruby · Jan 20, 2025 · 49681ed · 49681ed
1 parent 5880fd4
commit 49681ed
Showing 1 changed file with 2 additions and 2 deletions.
diff --git a/lib/resolv.rb b/lib/resolv.rb
@@ -661,8 +661,8 @@ def self.free_request_id(host, port, id) # :nodoc:
 
     def self.bind_random_port(udpsock, bind_host="0.0.0.0") # :nodoc:
       begin
-        port = random(1024..65535)
-        udpsock.bind(bind_host, port)
+        # Simply use 0 with assuming RFC-6056 is applied.
+        udpsock.bind(bind_host, 0)
       rescue Errno::EADDRINUSE, # POSIX
              Errno::EACCES, # SunOS: See PRIV_SYS_NFS in privileges(5)
              Errno::EPERM # FreeBSD: security.mac.portacl.port_high is configurable.  See mac_portacl(4).