https://git.ruby-lang.org/ruby.git/commit/?id=f37cc1c719

From f37cc1c719f12d2cad6032aa4e6f4236f0604992 Mon Sep 17 00:00:00 2001
From: Jeremy Evans <code@j...>
Date: Sun, 7 Jul 2019 18:51:42 -0700
Subject: Fallback to TCP in resolv if UDP bind raises EACCES

Original patch from Andy Grimm.

Fixes [Bug #10747]

diff --git a/lib/resolv.rb b/lib/resolv.rb
index 2b81c05..3d401cc 100644
--- a/lib/resolv.rb
+++ b/lib/resolv.rb
@@ -514,10 +514,15 @@ class Resolv https://github.com/ruby/ruby/blob/trunk/lib/resolv.rb#L514
 
     def fetch_resource(name, typeclass)
       lazy_initialize
-      requester = make_udp_requester
+      begin
+        requester = make_udp_requester
+      rescue Errno::EACCES
+        # fall back to TCP
+      end
       senders = {}
       begin
         @config.resolv(name) {|candidate, tout, nameserver, port|
+          requester ||= make_tcp_requester(nameserver, port)
           msg = Message.new
           msg.rd = 1
           msg.add_question(candidate, typeclass)
@@ -550,7 +555,7 @@ class Resolv https://github.com/ruby/ruby/blob/trunk/lib/resolv.rb#L555
           end
         }
       ensure
-        requester.close
+        requester&.close
       end
     end
 
-- 
cgit v0.10.2


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