[tor-bugs] #4771 [BridgeDB]: bridgedb should make clearer in its logs which addresses it knows are from bulk-exitlist

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#4771: bridgedb should make clearer in its logs which addresses it knows are from
bulk-exitlist
--------------------------+--------------------------------------------
     Reporter:  arma      |      Owner:  isis
         Type:  defect    |     Status:  needs_review
     Priority:  minor     |  Milestone:
    Component:  BridgeDB  |    Version:
   Resolution:            |   Keywords:  isis2015Q1Q2, isisExB, isisExC
Actual Points:            |  Parent ID:
       Points:            |
--------------------------+--------------------------------------------

Comment (by isis):

 Replying to [comment:17 isis]:
 > Replying to [comment:16 isis]:
 > > Replying to an email from Robert Ransom:
 > > > Replying to [comment:15 isis]:
 > > > > This fixes the issue with confusing logging, and also fixes the
 issue that changing your Tor exit gets you different bridges.
 > > >
 > > > That was intentional, and (at least back in 2011) arma/Roger
 considered it a good feature.
 > > >
 > > > At least it should spread out the load due to honest users who
 obtain bridges by HTTPS-over-Tor better than serving the same small set to
 all HTTPS-over-Tor bridge users.
 > >
 > > Ah, that is a good point!  But it also means that the whole
 subhashring for Tor users can be super easily scraped, meaning that if a
 user in China has already gotten their Tor working, and then they ask for
 bridges over Tor, they'll likely get bridges that are already blocked. :(
 >
 > If we want to spread out the load more, we could do something like
 `int(ip) % 4` and put that into the HMACed data, in order to split the
 Tor/proxy users into four groups, with separate bridges for each one. That
 would still make it impossible to get the whole subhashring in one go.

 Okay, I went with doing the `int(ip) % 4` thing.  See
 [https://gitweb.torproject.org/user/isis/bridgedb.git/commit?id=6cfee6452ac63fa019cdf08c1f633dcb9aba8c81
 commit] 6cfee6452ac63fa019cdf08c1f633dcb9aba8c81 in my `fix/4771-log-tor-
 exits`
 [https://gitweb.torproject.org/user/isis/bridgedb.git/log/?h=fix/4771-log-
 tor-exits branch].

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/4771#comment:19>
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