search

anima-wg / brski-discovery

0 stars 1 forks source link

Allow an empty TXT record when using DNS-SD encoding? #8

Open EskoDijk opened 5 days ago

EskoDijk commented 5 days ago

Current draft mentions that DNS-SD does not allow an empty TXT record

A variation may have the option of being represented by the empty string "". This is not allowed in the DNS-SD encoding, and instead the alternative variation string MUST always be used for DNS-SD.

However, an empty string is allowed - just use a single byte 0 in the TXT record as defined by https://datatracker.ietf.org/doc/html/rfc6763#autoid-13 which makes the TXT keys set empty.

Even if other TXT keys would be defined such as

mynicekey=hello world abc=42

then the absence of a specific variation string implies that the default variation "" is used, I think.

EskoDijk commented 5 days ago

@toerless to comment on this!

toerless commented 5 days ago

Thanks, Esko. I also recently stumbled across this but would have forgotten to fix it. Let me keep it open until i fix this for DNS...

But there is also the question of how to deal with "" in CORE-LF. Right now the encoding is to have only a space contatenated string of variations. This format would not permit an empty string.

So i wonder if we want to still say "We can never be sure that some future encoding may not support an empty string, so we should always have an alternative to it...

Opinions ?