#DNS devroom. Because it's always DNS when it works.

#FOSDEM

We start with #Rust: last news of the domain crate.

First big user of this library is #Cascade, the #DNSSEC signer.

#FOSDEM #DNS

For #DNSSEC, the domain crate can use different crypto backends such as the ring crate or the #OpenSSL bindings. (But there are more.)

There is now a common-line tool to query the DNS, dnsi. And a CLI tool to do misc. manipulations, dnst ("people are using the ldns library example programs in production"). And a key manager, keyset.

#FOSDEM

The #DNS devroom is full. Stop trying to enter!

#FOSDEM

Now, no longer Rust, we switch to a real language, Erlang. The authoritative name server erldns at DNSimple.

#FOSDEM

A good mission statement for DNS Tapir "Breaking the bad, stopping the ugly"

#FOSDEM

DNS Tapir analyzes #DNS query data. Among the challenges, privacy, if you want to give access to these data.

Obviously, "anonymization" is a joke and so is pseudonymization. DNS Tapir aggregates instead.

https://www.dnstapir.se/

#FOSDEM

Checking software updates with the #DNS https://mastodon.gougere.fr/@DNSresolver/115995030018880844

Go has a transparency log of its software, for supply-chains security https://www.gopherwatch.org/

#FOSDEM

And this log can now be queried through #DNS https://mastodon.gougere.fr/@DNSresolver/115995045484678683

(and with #DNSSEC authentication)

Built with the excellent Go DNS library https://github.com/miekg/dns

#FOSDEM

And then on top of that, you can implement automatic software updates. No more unpatched vulnerabilities.

With a real live demo, complete with an error message (No space left on device)

#FOSDEM

"#DNS, a love affair with lovecraftian horrors"

Nice horrible font on the titles at the slides.

https://mastodon.gougere.fr/@DNSresolver/115995180261693055

#FOSDEM

Checking email addresses in SOA records of .se: lot of funny things.

#FOSDEM #DNS

Now in the retrocomputing devroom, learning how to translate binaries of the game console NES to modern processors. (Not JIT, static translation)

Going to LLVM which then produces the real code.

Cannot yet run all the NES games. But it can run #Pacman

#FOSDEM

Now, let's hack a Z80. The "Mail station" ("email without a PC").
"Internet appliances" were common at this time.

#FOSDEM

Software updates were done by email, carrying arbitrary Z80 code.

The only protection was... SimpleDES (10 bits key).

Since the original infrastructure for the machine no longer exists, hack is needed.

#FOSDEM

Digging into an old Belgian computer, MMIF (1952-1962).

Inaugurated by the king.

At the end, 13 meters, 5000 vacuum tubes, 25 kW of power.

Harvard architecture (code and data were completely separated).

#FOSDEM

Biquinary encoding. Unlike binary, there are more 0 and less 1 because 1 used more power (and 1 which were too close could interfere).

#FOSDEM

Now, creating an Internet access provider, with modems. Make 1990 great again.

Why doing it? Because it is fun but also because in some cases, it can circumvent censorship (Egypt, 2011).

On Linux, with ppp and mgetty (and systemd!).

https://neo146.net/

#FOSDEM