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Bug#1000787: dig: Underscores in domain get unexpectedly removed from query

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  Bug#1000787: dig: Underscores in domain get unexpectedly removed from query Felix <felix@felix-zauberer.de> - 2021-11-28 23:00 +0100
    Bug#1000787: host: Names that start with an underscore are no longer resolved Frédéric MASSOT <frederic@juliana-multimedia.com> - 2021-12-16 15:20 +0100

#1083429 — Bug#1000787: dig: Underscores in domain get unexpectedly removed from query

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Package: bind9-dnsutils
Version: 1:9.17.20-3
Severity: normal
Tags: upstream

Dear Maintainer,

While checking some of my DNS records I got NXDOMAIN responses for all
SRV queries.

I found out, that it has nothing to do with SRV, but with the underscore
in the domain.
The current behaviour is the following (note the missing underscores in
the QUESTION SECTION):

```
$ dig _xmpp-client._tcp.debian.org srv
...
;; QUESTION SECTION:
;xmpp-client.tcp.debian.org.	IN	SRV
...
```

The expected result (tested on another machine on Debian Bullseye, DiG
9.16.22-Debian) is:

```
$ dig _xmpp-client._tcp.debian.org srv
...
;; QUESTION SECTION:
;_xmpp-client._tcp.debian.org.	IN	SRV
...
```

Underscores simply get removed from the query.

-- System Information:
Debian Release: bookworm/sid
  APT prefers unstable
  APT policy: (500, 'unstable')
Architecture: amd64 (x86_64)

Kernel: Linux 5.15.0-2-amd64 (SMP w/4 CPU threads)
Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8), LANGUAGE=en_US:en
Shell: /bin/sh linked to /usr/bin/dash
Init: systemd (via /run/systemd/system)
LSM: AppArmor: enabled

Versions of packages bind9-dnsutils depends on:
ii  bind9-host [host]  1:9.17.20-3
ii  bind9-libs         1:9.17.20-3
ii  libc6              2.32-4
ii  libedit2           3.1-20210910-1
ii  libidn2-0          2.3.2-2
ii  libkrb5-3          1.18.3-7
ii  libprotobuf-c1     1.3.3-1+b2

bind9-dnsutils recommends no packages.

bind9-dnsutils suggests no packages.

-- no debconf information

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#1085931 — Bug#1000787: host: Names that start with an underscore are no longer resolved

Package: bind9-host
Version: 1:9.17.20-3
Followup-For: Bug #1000787

Dear Maintainer,

There is the same problem with the host command from the bind9-host package.

Since the last updates the host command no longer resolves names that start with an underscore.

Names that start with underscores are used by SRV types or with CNAME types to validate SSL certificates.

I can no longer verify that the addition was done correctly in the DNS zones.


Regards.


-- System Information:
Debian Release: bookworm/sid
  APT prefers stable-updates
  APT policy: (500, 'stable-updates'), (500, 'stable-security'), (500, 'testing'), (500, 'stable')
Architecture: amd64 (x86_64)

Kernel: Linux 5.15.0-2-amd64 (SMP w/8 CPU threads)
Locale: LANG=fr_FR.UTF-8, LC_CTYPE=fr_FR.UTF-8 (charmap=UTF-8), LANGUAGE not set
Shell: /bin/sh linked to /usr/bin/dash
Init: systemd (via /run/systemd/system)
LSM: AppArmor: enabled

Versions of packages bind9-host depends on:
ii  bind9-libs  1:9.17.20-3
ii  libc6       2.32-5
ii  libidn2-0   2.3.2-2

bind9-host recommends no packages.

bind9-host suggests no packages.

-- no debconf information

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