From d040cb869d63d78a34e9efe9f517fa8829fbf6d9 Mon Sep 17 00:00:00 2001
From: Peter van Dijk <peter.van.dijk@powerdns.com>
Date: Fri, 1 Jul 2022 12:24:13 +0200
Subject: [PATCH] auth 2136: match autosplit TXT correctly

---
 modules/tinydnsbackend/data                   |   1 +
 modules/tinydnsbackend/data.cdb               | Bin 1355665 -> 1356068 bytes
 pdns/rfc2136handler.cc                        |  13 ++++++++++++-
 .../1dyndns-update-add-delete-txt/command     |  18 +++++++++++++++++-
 .../expected_result                           |  12 ++++++++++++
 regression-tests/zones/test.dyndns.orig       |   3 +++
 6 files changed, 45 insertions(+), 2 deletions(-)

diff --git a/modules/tinydnsbackend/data b/modules/tinydnsbackend/data
index f8adb95c3d..b5120a79c7 100644
--- a/modules/tinydnsbackend/data
+++ b/modules/tinydnsbackend/data
@@ -20219,6 +20219,7 @@ Ztest.com:ns1.test.com.:ahu.example.com.:2005092501:28800:7200:604800:86400:3600
 +ttl.test.dyndns:127.0.0.1:3600
 :delete-add.test.dyndns:16:\034Should\040be\040gone\040after\040a\040while:3600
 :txt.test.dyndns:16:\021This\040is\040some\040text:3600
+:xautosplit.test.dyndns:16:\377They\040fixed\040up\040the\040corner\040store\040like\040it\040was\040a\040nightclub\040-\040It\047s\040permanently\040disco\040-\040Everyone\040is\040dressed\040so\040oddly\040I\040can\047t\040recognize\040them\040-\040I\040can\047t\040tell\040the\040staff\040from\040the\040customers\040-\040Baby\040check\040this\040out\054\040I\047ve\040got\040something\040to\040say\040-\040Man\054\040it\047s\040so\040loud\040in\040here\040S-\040When\040they\040stop\040the\040drum\040machine\040and\040I\040can\040think\040again\040-\040I\047ll\040remember\040what\040it\040was:3600
 @test.dyndns::host-1.test.dyndns.:10:3600
 @test.dyndns::host-2.test.dyndns.:20:3600
 Ccname1.test.dyndns:host-1.test.dyndns.:3600
diff --git a/modules/tinydnsbackend/data.cdb b/modules/tinydnsbackend/data.cdb
index 5460277209efc0e6299c0e6564158ef252e271ba..bdaff5fd8d0e22a0a8c16c569963b2673f53991d 100644
GIT binary patch
delta 4433
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diff --git a/pdns/rfc2136handler.cc b/pdns/rfc2136handler.cc
index ea985b35c0..24763517b4 100644
--- a/pdns/rfc2136handler.cc
+++ b/pdns/rfc2136handler.cc
@@ -1,3 +1,4 @@
+#include "dnswriter.hh"
 #ifdef HAVE_CONFIG_H
 #include "config.h"
 #endif
@@ -398,7 +399,17 @@ uint PacketHandler::performUpdate(const string &msgPrefix, const DNSRecord *rr,
           recordsToDelete.push_back(rec);
       }
       if (rr->d_class == QClass::NONE) { // 3.4.2.4
-        if (rrType == rec.qtype && rec.getZoneRepresentation() == rr->d_content->getZoneRepresentation())
+        auto repr = rec.getZoneRepresentation();
+        if (rec.qtype == QType::TXT) {
+          DLOG(g_log<<msgPrefix<<"Adjusting TXT content from ["<<repr<<"]"<<endl);
+          auto drc = DNSRecordContent::mastermake(rec.qtype.getCode(), QClass::IN, repr);
+          auto ser = drc->serialize(rec.qname, true, true);
+          auto rc = DNSRecordContent::deserialize(rec.qname, rec.qtype.getCode(), ser);
+          repr = rc->getZoneRepresentation(true);
+          DLOG(g_log<<msgPrefix<<"Adjusted TXT content to ["<<repr<<"]"<<endl);
+        }
+        DLOG(g_log<<msgPrefix<<"Matching RR in RRset - (adjusted) representation from request=["<<repr<<"], rr->d_content->getZoneRepresentation()=["<<rr->d_content->getZoneRepresentation()<<"]"<<endl);
+        if (rrType == rec.qtype && repr == rr->d_content->getZoneRepresentation())
           recordsToDelete.push_back(rec);
         else
           rrset.push_back(rec);
diff --git a/regression-tests/tests/1dyndns-update-add-delete-txt/command b/regression-tests/tests/1dyndns-update-add-delete-txt/command
index 05d1f88f29..02b50e052d 100755
--- a/regression-tests/tests/1dyndns-update-add-delete-txt/command
+++ b/regression-tests/tests/1dyndns-update-add-delete-txt/command
@@ -1,4 +1,4 @@
-#!/bin/sh
+#!/bin/sh -x
 
 ## add + delete with explicit data
 
@@ -130,3 +130,19 @@ answer
 # check if the record was deleted.
 cleandig test.dyndns TXT
 
+## now remove the overly long entry that was autosplit
+
+# check that it exists now
+cleandig xautosplit.test.dyndns TXT
+
+# delete it
+cleannsupdate <<!
+server $nameserver $port
+zone test.dyndns
+update delete xautosplit.test.dyndns. TXT "They fixed up the corner store like it was a nightclub - It's permanently disco - Everyone is dressed so oddly I can't recognize them - I can't tell the staff from the customers - Baby check this out, I've got something to say - Man, it's so loud in here " "- When they stop the drum machine and I can think again - I'll remember what it was"
+send
+answer
+!
+
+# check that it is gone
+cleandig xautosplit.test.dyndns TXT
diff --git a/regression-tests/tests/1dyndns-update-add-delete-txt/expected_result b/regression-tests/tests/1dyndns-update-add-delete-txt/expected_result
index 14b69e04ae..802d760874 100644
--- a/regression-tests/tests/1dyndns-update-add-delete-txt/expected_result
+++ b/regression-tests/tests/1dyndns-update-add-delete-txt/expected_result
@@ -91,3 +91,15 @@ Answer:
 1	test.dyndns.	IN	SOA	3600	ns1.test.dyndns. ahu.example.dyndns. 2022070136 28800 7200 604800 86400
 Rcode: 0 (No Error), RD: 0, QR: 1, TC: 0, AA: 1, opcode: 0
 Reply to question for qname='test.dyndns.', qtype=TXT
+0	xautosplit.test.dyndns.	IN	TXT	3600	"They fixed up the corner store like it was a nightclub - It's permanently disco - Everyone is dressed so oddly I can't recognize them - I can't tell the staff from the customers - Baby check this out, I've got something to say - Man, it's so loud in here " "- When they stop the drum machine and I can think again - I'll remember what it was"
+Rcode: 0 (No Error), RD: 0, QR: 1, TC: 0, AA: 1, opcode: 0
+Reply to question for qname='xautosplit.test.dyndns.', qtype=TXT
+Answer:
+;; ->>HEADER<<- opcode: UPDATE, status: NOERROR, id: [id]
+;; flags: qr aa; ZONE: 1, PREREQ: 0, UPDATE: 0, ADDITIONAL: 0
+;; ZONE SECTION:
+;test.dyndns.			IN	SOA
+
+1	test.dyndns.	IN	SOA	3600	ns1.test.dyndns. ahu.example.dyndns. 2022070137 28800 7200 604800 86400
+Rcode: 3 (Non-Existent domain), RD: 0, QR: 1, TC: 0, AA: 1, opcode: 0
+Reply to question for qname='xautosplit.test.dyndns.', qtype=TXT
diff --git a/regression-tests/zones/test.dyndns.orig b/regression-tests/zones/test.dyndns.orig
index 3f843c5916..823bb03500 100644
--- a/regression-tests/zones/test.dyndns.orig
+++ b/regression-tests/zones/test.dyndns.orig
@@ -32,3 +32,6 @@ e.host			IN	A	1.1.1.1
 
 sub				IN NS ns1.test.dyndns.
 sub				IN NS ns2.test.dyndns.
+
+; unlike other records in this zone, the record below will actually disappear during the 1dyndns-update-add-delete-txt test
+xautosplit       IN TXT "They fixed up the corner store like it was a nightclub - It's permanently disco - Everyone is dressed so oddly I can't recognize them - I can't tell the staff from the customers - Baby check this out, I've got something to say - Man, it's so loud in here - When they stop the drum machine and I can think again - I'll remember what it was"
-- 
2.47.2