Provide dnssec capabilities about docker-dnsmasq

[andyshinn]

Are there features that would change or be lost from switching to the dnsmasq-dnssec package?

[bjmi]

$ docker run --rm -it alpine:3.12 sh -c "apk add dnsmasq-dnssec; /usr/sbin/dnsmasq -v"
fetch http://dl-cdn.alpinelinux.org/alpine/v3.12/main/x86_64/APKINDEX.tar.gz
fetch http://dl-cdn.alpinelinux.org/alpine/v3.12/community/x86_64/APKINDEX.tar.gz
(1/3) Installing gmp (6.2.0-r0)
(2/3) Installing nettle (3.5.1-r1)
(3/3) Installing dnsmasq-dnssec (2.81-r0)
Executing dnsmasq-dnssec-2.81-r0.pre-install
Executing busybox-1.31.1-r19.trigger
OK: 7 MiB in 17 packages
Dnsmasq version 2.81  Copyright (c) 2000-2020 Simon Kelley
Compile time options: IPv6 GNU-getopt no-DBus no-UBus no-i18n no-IDN DHCP DHCPv6 no-Lua TFTP no-conntrack ipset auth DNSSEC loop-detect inotify dumpfile

The compile options
IPv6 GNU-getopt no-DBus no-UBus no-i18n no-IDN DHCP DHCPv6 no-Lua TFTP no-conntrack ipset auth DNSSEC loop-detect inotify dumpfile
and
IPv6 GNU-getopt no-DBus no-UBus no-i18n no-IDN DHCP DHCPv6 no-Lua TFTP no-conntrack ipset auth no-DNSSEC loop-detect inotify dumpfile
differs in DNSSEC and no-DNSSEC only.

• https://pkgs.alpinelinux.org/contents?file=&path=&name=dnsmasq-dnssec&branch=v3.12&repo=main&arch=x86_64 additionally contains /usr/share/dnsmasq/trust-anchors.conf towards
• https://pkgs.alpinelinux.org/contents?file=&path=&name=dnsmasq&branch=v3.12&repo=main&arch=x86_64

I checked the content of both apks and the configuration files are identical.

[andyshinn]

Are you able to open a pull request for this? I think we could add it to master branch and I can create a edge tag you can try until we release a new version. That way it can get some testing to make sure it doesn't affect other stuff. I don't know if the addition could affect latency or something like that.

[bjmi]

DNSSEC validation is disabled by default therefore it shouldn't affect existing configurations and can be activated as follows:

dnssec
conf-file=/usr/share/dnsmasq/trust-anchors.conf