#24498: add configurables for eventdns settings
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Reporter: Dhalgren | Owner: (none)
Type: enhancement | Status: new
Priority: Medium | Milestone:
Component: Core Tor | Version: Tor: unspecified
Severity: Normal | Keywords:
Actual Points: | Parent ID:
Points: | Reviewer:
Sponsor: |
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Scenarios exist where relay operators may wish to tune libevent evdns.c
(eventdns) for specific exit relay requirements. For example ideal values
on a high-performance exit where a local instance of Unbound is utilized
might be attempts=1 timeout=15, max-inflight=16384, but these settings are
inappropriate when bind9/named or non-local Unbound are employed.
Target settings:
max-inflight
max-timeouts
timeout
attempts
Settings already configurable:
randomize-case
Other evdns.c settings exist that are not set in src/or/dns.c and it seems
reasonable to omit them here as these can be adjusted via resolv.conf.
The settings targeted here are under the control of the Tor daemon such
that resolv.conf "options" have no effect.
Predecessor tickets: #18580 #21394
I am willing to contribute a patch for this and unless I am advised
otherwise will prepare and submit one in the next two or three weeks.
A behavior I'm inclined to implement is to have the value -1 signify that
dns.c should not touch the settings, permitting resolv.conf "options" to
control.
--
Ticket URL: <https://trac.torproject.org/projects/tor/ticket/24498>
Tor Bug Tracker & Wiki <https://trac.torproject.org/>
The Tor Project: anonymity online
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