[tor-bugs] #12389 [Tor]: Should we warn when exit nodes are using opendns or google dns?

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#12389: Should we warn when exit nodes are using opendns or google dns?
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     Reporter:  nickm   |      Owner:
         Type:  defect  |     Status:  needs_revision
     Priority:  normal  |  Milestone:  Tor: 0.2.6.x-final
    Component:  Tor     |    Version:
   Resolution:          |   Keywords:  tor-relay 026-triaged-1
Actual Points:          |  Parent ID:
       Points:          |
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Changes (by nickm):

 * status:  needs_review => needs_revision


Comment:

 It's a good start; let me make a few suggestions.

  * There should be one table; it should probably list stuff like {
 "8.8.8.8", "Google" }, ...
  * The message should be something more like, "it looks like you're using
 a public %s nameserver for your Tor exit node. This can be a problem for
 the network: please see (URL)" and then link to some URL.
  * I think we need to detect whether the function is present using
 autoconf, and not just check for libevent 2.  After all, many libevent 2.0
 versions are out there already, without this new function.
  * In the new Libevent function, you extract started_at from the
 evdns_base before you lock the evdns_base.  That's a potential race
 condition, I think.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/12389#comment:3>
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