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Impove cache behaviour for TCP connections.

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For ease of implementaion, dnsmasq has always forked a new process to
handle each incoming TCP connection. A side-effect of this is that any
DNS queries answered from TCP connections are not cached: when TCP
connections were rare, this was not a problem.  With the coming of
DNSSEC, it's now the case that some DNSSEC queries have answers which
spill to TCP, and if, for instance, this applies to the keys for the
root then those never get cached, and performance is very bad.  This
fix passes cache entries back from the TCP child process to the main
server process, and fixes the problem.
This commit is contained in:
Simon Kelley
2018-10-18 19:35:29 +01:00
parent 91421cb757
commit a799ca0c63
5 changed files with 291 additions and 19 deletions
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14
CHANGELOG
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@@ -1,3 +1,17 @@
version 2.81
Impove cache behaviour for TCP connections. For ease of
implementaion, dnsmasq has always forked a new process to handle
each incoming TCP connection. A side-effect of this is that
any DNS queries answered from TCP connections are not cached:
when TCP connections were rare, this was not a problem.
With the coming of DNSSEC, it's now the case that some
DNSSEC queries have answers which spill to TCP, and if,
for instance, this applies to the keys for the root then
those never get cached, and performance is very bad.
This fix passes cache entries back from the TCP child process to
the main server process, and fixes the problem.
version 2.80
Add support for RFC 4039 DHCP rapid commit. Thanks to Ashram Method
for the initial patch and motivation.