Improve filter-AAAA and filter-A

Resolves: RHEL-105367

dnsmasq-2.89-filter-AAAA-improve.patch

@@ -0,0 +1,56 @@
+From fe965ba1e477ed9f5933d01771ae1174aafb8359 Mon Sep 17 00:00:00 2001
+From: Simon Kelley <simon@thekelleys.org.uk>
+Date: Mon, 20 Mar 2023 15:16:29 +0000
+Subject: [PATCH] Improve cache use with --filter-A and --filter-AAAA
+
+If --filter-AAAA is set and we have cached entry for
+the domain in question fpr any RR type that allows us to
+return a NODATA reply when --filter-AAAA is set without
+going upstream. Similarly for --filter-A.
+
+(cherry picked from commit 5a9eae429a7d0680d606f03f2759d7dde0bbe3f0)
+---
+ src/rfc1035.c | 20 ++++++++++++++++++++
+ 1 file changed, 20 insertions(+)
+
+diff --git a/src/rfc1035.c b/src/rfc1035.c
+index 0e251c7..dd8b549 100644
+--- a/src/rfc1035.c
++++ b/src/rfc1035.c
+@@ -1741,6 +1741,25 @@ size_t answer_request(struct dns_header *header, char *limit, size_t qlen,
+ 			anscount++;
+ 		    }
+ 		}
++	      else if (((flag & F_IPV4) && option_bool(OPT_FILTER_A)) || ((flag & F_IPV6) && option_bool(OPT_FILTER_AAAA)))
++		{
++		  /* We don't have a cached answer and when we get an answer from upstream we're going to
++		     filter it anyway. If we have a cached answer for the domain for another RRtype then
++		     that may be enough to tell us if the answer should be NODATA and save the round trip.
++		     Cached NXDOMAIN has already been handled, so here we look for any record for the domain,
++		     since its existence allows us to return a NODATA answer. Note that we never set the AD flag,
++		     since we didn't authentucate the record. We do set the AA flag since this answer comes from
++		     local config. */
++
++		  if (cache_find_by_name(NULL, name, now, F_IPV4 | F_IPV6 | F_SRV))
++		    {
++		      ans = 1;
++		      sec_data = 0;
++
++		      if (!dryrun)
++			log_query(F_NEG | F_CONFIG | flag, name, NULL, 0);
++		    }
++		}
+ 	    }
+ 
+ 	  if (qtype == T_MX || qtype == T_ANY)
+@@ -1751,6 +1770,7 @@ size_t answer_request(struct dns_header *header, char *limit, size_t qlen,
+ 		  {
+ 		    ans = found = 1;
+ 		    sec_data = 0;
++		    
+ 		    if (!dryrun)
+ 		      {
+ 			int offset;
+-- 
+2.50.1
+

dnsmasq.spec

@@ -76,6 +76,8 @@ Patch17:	dnsmasq-2.90-CVE-2023-50387-CVE-2023-50868.patch
 # https://lists.thekelleys.org.uk/pipermail/dnsmasq-discuss/2021q2/015107.html
 # http://thekelleys.org.uk/gitweb/?p=dnsmasq.git;a=commit;h=eb1fe15ca80b6bc43cd6bfdf309ec6c590aff811
 Patch18:        dnsmasq-2.87-filter-AAAA.patch
+# http://thekelleys.org.uk/gitweb/?p=dnsmasq.git;a=commit;h=5a9eae429a7d0680d606f03f2759d7dde0bbe3f0
+Patch19:        dnsmasq-2.89-filter-AAAA-improve.patch
 
 # This is workaround to nettle bug #1549190
 # https://bugzilla.redhat.com/show_bug.cgi?id=1549190