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Documentation for --do-0x20-encode.

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Simon Kelley
2025-03-09 16:15:16 +00:00
parent e427d4b0e6
commit fc9135ca9f
2 changed files with 12 additions and 6 deletions
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8
CHANGELOG
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@@ -113,9 +113,11 @@ version 2.91
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.
will be logged. In this release, 0x020-encoding is default-off
and must be explicitly enabled with --do-0x20-encoding. In future
releases it may default on. You can avoid a future release
changing the behaviour of an installation with --no-x20-encode.
Fix a long-standing problem when two queries which are identical
in every repect _except_ case, get combined by dnsmasq. If
dnsmasq gets eg, two queries for example.com and Example.com

10
man/dnsmasq.8
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@@ -852,13 +852,17 @@ name on successive queries, for load-balancing. This turns off that
behaviour, so that the records are always returned in the order
that they are received from upstream.
.TP
.B --no-0x20-encode
By default, dnsmasq scrambles the case of letters in DNS queries it sends upstream as a security feature.
.B --do-0x20-encode, --no-0x20-encode
Dnsmasq can scramble the case of letters in DNS queries it sends upstream as a security feature.
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 this scrambling with --no-0x20-encode.
is necessary to disable the feature. As at version 2.91, 0x20 encoding
is disabled by default, and must be enabled with --do-0x20-encode. The default
may change in the future, so to be sure of its status after an upgrade, set --do-0x20-encode
or --no-0x20-encode in your config. --no-0x20-encode overrides --do-x20-encode or a future default
0x20-encode enable.
.TP
.B --use-stale-cache[=<max TTL excess in s>]
When set, if a DNS name exists in the cache, but its time-to-live has expired, dnsmasq will return the data anyway. (It attempts to refresh the