[tor-bugs] #449 [Core Tor/Tor]: dns failures prevent legitimate options being set

Tor Bug Tracker & Wiki blackhole at torproject.org
Tue May 23 18:34:45 UTC 2017


#449: dns failures prevent legitimate options being set
------------------------------------------------+--------------------------
 Reporter:  mwenge                              |          Owner:  nickm
     Type:  defect                              |         Status:  accepted
 Priority:  Low                                 |      Milestone:  Tor:
                                                |  unspecified
Component:  Core Tor/Tor                        |        Version:
                                                |  0.2.0.2-alpha
 Severity:  Normal                              |     Resolution:  None
 Keywords:  dns, tor-hs, tor-client, tor-relay  |  Actual Points:
Parent ID:                                      |         Points:  4
 Reviewer:                                      |        Sponsor:
------------------------------------------------+--------------------------

Comment (by nickm):

 So, what can we do here?  One option is to cache the results of DNS
 lookups that we did as part of the torrc parse, and then later to treat a
 failed lookup for the same hostname as meaning that we should use the
 cached address.

 I don't think we'd want to do this for DNS lookups in general -- we'd want
 to audit every place that we do a DNS lookup (except evdns.c) to see
 whether this is the behavior we want or not.

--
Ticket URL: <https://trac.torproject.org/projects/tor/ticket/449#comment:12>
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