[dns-operations] creeping TXT records

John Levine johnl at taugh.com
Sat Mar 14 21:02:44 UTC 2020


In article <20200314203823.37938.qmail at f3-external.bushwire.net> you write:
>On 14Mar20, Paul Vixie allegedly wrote:
>
>> yes. this code had to run on a PDP-11.
>
>Bummer. Based on this, is it reasonable to assume a TXT only holds
>7-bit ASCII then? Not until the Experimental RFC1464 do we finally
>find explicit mention of a code set for the contents of a TXT in a
>very specific use-case.

If you stuff arbitrary octal escapes into your txt records, it works
with all of the DNS software I know.

Back when I was trying to figure out how to do IPv6 DNSBLs efficiently
I did an overclever design that stored the ranges in a B-tree with
each node being a large TXT record full of binary glop.  It worked OK.



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