From a7ca9aba7bc31c5071d39191aa96b9d6740769a8 Mon Sep 17 00:00:00 2001
From: dmiller <dmiller@e0a8ed71-7df4-0310-8962-fdc924857419>
Date: Fri, 9 May 2025 22:47:07 +0000
Subject: [PATCH] Also try system resolver for unqualified (no-dot) DNS names

---
 nmap_dns.cc | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/nmap_dns.cc b/nmap_dns.cc
index 3b63e783c..e3021d0bf 100644
--- a/nmap_dns.cc
+++ b/nmap_dns.cc
@@ -802,6 +802,11 @@ static void read_evt_handler(nsock_pool nsp, nsock_event evt, void *) {
           break;
         }
       }
+      if (!processing_successful && reqt->name.find('.') == std::string::npos) {
+        // Names without a dot: system resolver may do better.
+          process_request(ACTION_SYSTEM_RESOLVE, reqinfo);
+          processing_successful = true;
+      }
     }
 
     if (!processing_successful) {