From 05b7e4bf0d2fa8fa50746c752af33a1c6b41173b Mon Sep 17 00:00:00 2001
From: Matthias Schiffer <mschiffer@universe-factory.net>
Date: Sun, 13 May 2012 07:41:38 +0200
Subject: Don't reuse query packet for reply

---
 mdns-resolver | 21 +++++++++++----------
 1 file changed, 11 insertions(+), 10 deletions(-)

diff --git a/mdns-resolver b/mdns-resolver
index 592c754..c78e9f3 100755
--- a/mdns-resolver
+++ b/mdns-resolver
@@ -8,7 +8,7 @@ require 'net/dns/packet'
 ### Config ###
 $domain = 'mesh.ffhl'
 $port   = 53
-$ttl    = 0
+$ttl    = 10
 $ns     = ['mesh.ffhl. 3600 IN NS paul.ffhl.']
 $soa    = 'mesh.ffhl. 3600 IN SOA paul.ffhl. freifunk\.luebeck.asta.uni-luebeck.de. 1 3600 180 600 60'
 ### Config end ###
@@ -71,20 +71,21 @@ while run do
     end
     return if pktinfo.nil?
 
-    packet = Net::DNS::Packet::parse(data)
+    query = Net::DNS::Packet::parse(data)
 
-    return unless packet.header.opCode == Net::DNS::Header::QUERY
-    return unless packet.header.query?
+    return unless query.header.opCode == Net::DNS::Header::QUERY
+    return unless query.header.query?
 
+    packet = Net::DNS::Packet.new
+    packet.header.id = query.header.id
+    packet.header.opCode = Net::DNS::Header::QUERY
     packet.header.qr = 1
     packet.header.aa = 1
-    packet.header.tc = 0
-    packet.header.ra = 0
-    packet.header.cd = 0
-    packet.header.ad = 0
-    packet.header.rCode = Net::DNS::Header::RCode::NOERROR
+    packet.header.rd = query.header.recursive?
+
+    query.question.each do |q|
+      packet.question << q
 
-    packet.question.each do |q|
       next unless q.qClass.to_i == Net::DNS::IN
 
       if q.qName == $domain+'.'
-- 
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