[tor-bugs] #10468 [Tor]: Make DnsPort, IPv6, and AutomapHostsOnResolve work tother.

[Tor Bug Tracker & Wiki]

#10468: Make DnsPort, IPv6, and AutomapHostsOnResolve work tother.
-------------------------+-------------------------------------------------
     Reporter:  nickm    |      Owner:
         Type:  defect   |     Status:  needs_review
     Priority:  major    |  Milestone:  Tor: 0.2.5.x-final
    Component:  Tor      |    Version:
   Resolution:           |   Keywords:  tor-client 024-backport automap dns
Actual Points:           |  ipv6
       Points:           |  Parent ID:
-------------------------+-------------------------------------------------

Comment (by nickm):

 So the question is, what happens when we have automaphostsonresolve set to
 return A records, and we're connecting to foo.bar.com that only has an
 AAAA record?

 The answer is, nothing bad, I believe.  Locally, when the resolve happens,
 we pick a new 127.192.x.y address, and map that address to foo.bar.com.
 We store the mapping bidirectionally; see addressmap.c for the details.
 Then later when we get a connection attempt to 127.192.x.y, we rewrite
 that as foo.bar.com, and send a BEGIN cell with foo.bar.com in it.  The
 parameters for whether that connection is allowed to be IPv4 or IPv6
 depend on the settings of the port used to connect to 127.192.x.y, not the
 one that resolved foo.bar.com.

--
Ticket URL: <https://trac.torproject.org/projects/tor/ticket/10468#comment:4>
Tor Bug Tracker & Wiki <https://trac.torproject.org/>
The Tor Project: anonymity online