[tor-bugs] #18489 [Tor]: Fallback directories don't serve extrainfo descriptors

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#18489: Fallback directories don't serve extrainfo descriptors
------------------------+-----------------
     Reporter:  atagar  |      Owner:
         Type:  defect  |     Status:  new
     Priority:  Medium  |  Milestone:
    Component:  Tor     |    Version:
     Severity:  Normal  |   Keywords:
Actual Points:          |  Parent ID:
       Points:          |    Sponsor:
------------------------+-----------------
 Guess not too surprising, but most relays do not fetch extrainfo
 descriptors and as a result don't provide them when used as a fallback
 directory. For example...

 {{{
 # use Doedel26
 % curl
 http://178.254.20.134:80/tor/extra/fp/9695DFC35FFEB861329B9F1AB04C46397020CE31
 <no results>

 # use moria1
 curl
 http://128.31.0.39:9131/tor/extra/fp/9695DFC35FFEB861329B9F1AB04C46397020CE31
 extra-info moria1 9695DFC35FFEB861329B9F1AB04C46397020CE31
 published 2016-03-06 10:40:50
 write-history 2016-03-06 06:56:34 (14400 s)
 25821065216,26561069056,27690179584,25304364032,21429001216,15790654464
 read-history 2016-03-06 06:56:34 (14400 s)
 3077893120,3154214912,3207265280,3199601664,3018620928,2618984448
 ... etc...
 }}}

 Couple options come to mind...

 * Only pick fallbacks that serve extrainfo descriptors.
 * Don't use fallbacks when  'DownloadExtraInfo 1' is set.

 Of those I suspect we want to opt for the second since few relays probably
 mirror this information.

--
Ticket URL: <https://trac.torproject.org/projects/tor/ticket/18489>
Tor Bug Tracker & Wiki <https://trac.torproject.org/>
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