[tor-bugs] #19997 [Obfuscation/BridgeDB]: BridgeDB's get-tor-exits script doesn't account for IPv6

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#19997: BridgeDB's get-tor-exits script doesn't account for IPv6
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     Reporter:  isis                  |      Owner:  isis
         Type:  defect                |     Status:  new
     Priority:  Medium                |  Milestone:
    Component:  Obfuscation/BridgeDB  |    Version:
     Severity:  Major                 |   Keywords:  bridge-enumeration
Actual Points:                        |  Parent ID:
       Points:                        |   Reviewer:
      Sponsor:                        |
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 As Arlo pointed out [https://lists.torproject.org/pipermail/tor-
 dev/2016-August/011318.html on the tor-dev mailing list], the `exit-
 addresses` script running on check.torproject.org doesn't include IPv6
 exit addresses, making anything that relies upon the list unreliable.
 BridgeDB's `scripts/get-tor-exits` downloads the output of `exit-
 addresses`, and uses it to treat clients using Tor to request bridges as
 coming from the same address. Not taking IPv6 addresses into account will
 allow an adversary to use IPv6-capable tor exits to get additional bridges
 during a time period.

 Some new script should be written to generate a list of IPv6 (optionally
 also IPv4 addresses, so that everything is in one document) exit addresses
 to fix this issue.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/19997>
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