From 2564f0bf03da742b7dee74a882949894479b6a03 Mon Sep 17 00:00:00 2001
From: aca <aca@e0a8ed71-7df4-0310-8962-fdc924857419>
Date: Thu, 14 Jun 2012 17:19:03 +0000
Subject: [PATCH] added Daniel's patch

---
 scripts/dns-nsec3-enum.nse | 21 ++++++++++++---------
 1 file changed, 12 insertions(+), 9 deletions(-)

diff --git a/scripts/dns-nsec3-enum.nse b/scripts/dns-nsec3-enum.nse
index bc92c917a..84e8f4e73 100644
--- a/scripts/dns-nsec3-enum.nse
+++ b/scripts/dns-nsec3-enum.nse
@@ -216,16 +216,19 @@ local function query_for_hashes(host,subdomain,domain)
 	local result
 	local ranges = {}
 	status, result = dns.query(subdomain, {host = host.ip, dtype='NSEC3', retAll=true, retPkt=true, dnssec=true})
-	for _, nsec3 in ipairs(auth_filter(result, "NSEC3")) do
-		h1 = string.lower(remove_suffix(nsec3.dname,domain))
-		h2 = string.lower(nsec3.hash.base32)
-		if not table_contains(all_results,"nexthash " .. h1 .. " " .. h2) then
-			table.insert(all_results, "nexthash " .. h1 .. " " .. h2)
-			stdnse.print_debug("nexthash " .. h1 .. " " .. h2)
+	if status then 
+		for _, nsec3 in ipairs(auth_filter(result, "NSEC3")) do
+			h1 = string.lower(remove_suffix(nsec3.dname,domain))
+			h2 = string.lower(nsec3.hash.base32)
+			if not table_contains(all_results,"nexthash " .. h1 .. " " .. h2) then
+				table.insert(all_results, "nexthash " .. h1 .. " " .. h2)
+				stdnse.print_debug("nexthash " .. h1 .. " " .. h2)
+			end
+			ranges[h1] = h2
 		end
-		ranges[h1] = h2
-	end
-	
+	else 
+		stdnse.print_debug(1, "DNS error: %s", result)
+	end 
 	return ranges
 end