deadwood-2.9.01-edgecastcdn.net.patch

Deadwood was getting confused by packets like this:

$ askmara Awac.0B2D.edgecastcdn.net. 72.21.80.5
# Querying the server with the IP 72.21.80.5
# Question: Awac.0B2D.edgecastcdn.net.
wac.0B2D.edgecastcdn.net. +3600 cname ne.wac.edgecastcdn.net.
#ne1.wac.edgecastcdn.net. +14400 a 72.21.91.19
# NS replies:
#wac.edgecastcdn.net. +14400 ns ns1.edgecastcdn.net.
#wac.edgecastcdn.net. +14400 ns ns2.edgecastcdn.net.
# AR replies:
#ne.wac.edgecastcdn.net. +3600 cname ne1.wac.edgecastcdn.net.
#ns1.edgecastcdn.net. +172800 a 72.21.80.5
#ns2.edgecastcdn.net. +172800 a 72.21.80.6

This patch fixes the problem.

--- deadwood-2.9.02/src/DwRecurse.c.orig	2010-07-29 01:56:26.000000000 -0700
+++ deadwood-2.9.02/src/DwRecurse.c	2010-07-29 01:56:58.000000000 -0700
@@ -943,6 +943,9 @@
         }
 
         for(counter = 0; counter < view->look->ancount * 2; counter += 2) {
+		if(view->an_types[(counter >> 1)] == RRX_IGNORE) {
+			break;
+		}
                 if(view->an_types[(counter >> 1)] != RR_CNAME) {
                         goto catch_dwx_make_cname_refer;
                 }
@@ -1421,7 +1424,8 @@
                                                dwx_rrtype_number(query_type)) {
                                         return TYPE_ANSWER;
                                 }
-                                if(view->an_types[counter] != RR_CNAME) {
+                                if(view->an_types[counter] != RR_CNAME &&
+				   view->an_types[counter] != RRX_IGNORE) {
                                         return TYPE_NO_USEFUL_DATA;
                                 }
                         }