[tor-bugs] #26542 [Circumvention/BridgeDB]: Distribute IPv6 bridges though bridges.torproject.org

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#26542: Distribute IPv6 bridges though bridges.torproject.org
---------------------------------------------+-----------------------------
 Reporter:  teor                             |          Owner:  phw
     Type:  defect                           |         Status:
                                             |  needs_review
 Priority:  High                             |      Milestone:
Component:  Circumvention/BridgeDB           |        Version:
 Severity:  Normal                           |     Resolution:
 Keywords:  anti-censorship-roadmap-october  |  Actual Points:
Parent ID:  #24264                           |         Points:  3
 Reviewer:  sysrqb                           |        Sponsor:
                                             |  Sponsor30-must
---------------------------------------------+-----------------------------
Changes (by phw):

 * status:  assigned => needs_review
 * reviewer:   => sysrqb


Comment:

 Yes, this is a problem in BridgeDB. I fixed the distribution of vanilla
 IPv6 bridges in my
 [https://github.com/NullHypothesis/bridgedb/tree/fix/14065 fix/14065
 branch].

 Note that this patch doesn't fix the distribution of IPv6 PT bridges. The
 issue is that bridges currently cannot advertise both an IPv4 and an IPv6
 address for pluggable transports (see #11211), which is why a bridge's
 `transport` line always contains an IPv4 address.

 In theory, we could work around this issue by assuming that a PT bridge
 that has an IPv6 OR address also has an IPv6 PT address. This assumption
 may not always hold and BridgeDB is currently unable to do active scans to
 confirm if this is the case for a given bridge.

--
Ticket URL: <https://trac.torproject.org/projects/tor/ticket/26542#comment:15>
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