[nsd-users] NSD seems to force PTR RDATA to lower-case

[Niall O'Reilly]

Hello, NSD Developers.

I'm seeing, to my surprise, that NSD seems to be forcing PTR RDATA
to lower case when loading zone data from a file. Details follow
further on below.

Data specified in mixed case as "SSID-ORselves" appears in a DNS
response as "ssid-orselves".  Packet capture seems to confirm that what
I am seeing is not an artefact of the third-party test tool (dig) used.

This seems to be at odds with at least the spirit of both RFCs 1034 and
4343. It seems to me that transferring a zone from a master file to the
database should (even SHOULD) follow as thoroughly as possible the
same rules as apply to an over-the-wire transfer.

Perhaps I'm missing some configuration option, or just have a peculiar
reading of the scriptures, but I think this behaviour is erroneous.

Best regards,

Niall O'Reilly

```
$ uname -a
FreeBSD sand.no8.be 12.1-RELEASE-p6 FreeBSD 12.1-RELEASE-p6 GENERIC  
amd64


$ nsd -v
NSD version 4.3.1
Written by NLnet Labs.

Copyright (C) 2001-2006 NLnet Labs.  This is free software.
There is NO warranty; not even for MERCHANTABILITY or FITNESS
FOR A PARTICULAR PURPOSE.


$ grep -i '\.f\.ip6.* ssid' /usr/local/etc/nsd/no8.be.internal-zone
*.0.2.e.d.3.f.6.2.7.8.0.0.b.1.d.f.ip6 IN PTR SSID-ORselves
*.0.1.e.d.3.f.6.2.7.8.0.0.b.1.d.f.ip6 IN PTR SSID-ORguests
$ echo ${SSH_CLIENT%% *}
fd1b:87:26f3:de20:c4c:c229:aaf9:f66a


$ dig @::1 +norec -x ${SSH_CLIENT%% *}

; <<>> DiG 9.16.4 <<>> @::1 +norec -x 
fd1b:87:26f3:de20:c4c:c229:aaf9:f66a
; (1 server found)
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 53140
;; flags: qr aa; QUERY: 1, ANSWER: 3, AUTHORITY: 1, ADDITIONAL: 4

;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 4096
;; QUESTION SECTION:
;a.6.6.f.9.f.a.a.9.2.2.c.c.4.c.0.0.2.e.d.3.f.6.2.7.8.0.0.b.1.d.f.ip6.arpa. 
IN PTR

;; ANSWER SECTION:
3.f.6.2.7.8.0.0.b.1.d.f.ip6.arpa. 300 IN 
DNAME	3.f.6.2.7.8.0.0.b.1.d.f.ip6.no8.be.
a.6.6.f.9.f.a.a.9.2.2.c.c.4.c.0.0.2.e.d.3.f.6.2.7.8.0.0.b.1.d.f.ip6.arpa. 
300 IN CNAME 
a.6.6.f.9.f.a.a.9.2.2.c.c.4.c.0.0.2.e.d.3.f.6.2.7.8.0.0.b.1.d.f.ip6.no8.be.
a.6.6.f.9.f.a.a.9.2.2.c.c.4.c.0.0.2.e.d.3.f.6.2.7.8.0.0.b.1.d.f.ip6.no8.be. 
300	IN PTR ssid-orselves.no8.be.

;; AUTHORITY SECTION:
no8.be.			300	IN	NS	int-ns1.no8.be.

;; ADDITIONAL SECTION:
int-ns1.no8.be.		300	IN	AAAA	2001:bb6:572:b800::35:d
int-ns1.no8.be.		300	IN	AAAA	fd1b:87:26f3:de00::35:d
int-ns1.no8.be.		300	IN	A	10.0.16.13

;; Query time: 0 msec
;; SERVER: ::1#53(::1)
;; WHEN: Sun Jul 05 08:01:20 UTC 2020
;; MSG SIZE  rcvd: 359

$
```
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