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Add --no-0x20-encode config option.

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The "bit 0x20 encoding" implemented in 995a16ca0c
can interact badly with (hopefully) rare broken upstream servers. Provide
an option to turn it off and a log message to give a clue as to why DNS service
is non-functional.
This commit is contained in:
Simon Kelley
2025-02-03 21:02:12 +00:00
parent 1f84cde024
commit 5226b712a3
6 changed files with 62 additions and 19 deletions
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@@ -109,7 +109,12 @@ version 2.91
on the number of a-z and A-Z characters in the query, and this
implementation puts a hard limit of 32 bits to make rescource
allocation easy. This about doubles entropy over the standard
random ID and random port combination.
random ID and random port combination. This technique can interact
badly with rare broken DNS servers which don't preserve the case
of the query in their reply. The first time a reply is returned
which matches the query in all respects except case, a warning
will be logged. If this coincides with DNS not functioning, it
is necessary to disable bit 0x20 encoding with --no-0x20-encode.
version 2.90