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

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#10468: Make DnsPort, IPv6, and AutomapHostsOnResolve work tother.
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     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:
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Comment (by andrea):

 I think this looks okay, but lemme make sure I understand all this:

 1.) We get a request for an A or AAAA record

 2.) We need to make sure the answer is the same record type and the local
 transparent proxy IP we return is the right address family.

 3.) We need to set up mapping so that when we get incoming TCP connections
 on that IPv4 or IPv6 address we just returned, we send it the right place.

 4.) Now here's the slightly tricky case that I'm not 100% sure what we
 actually do without looking deeper: does the address family of the local
 transparent proxy IP and the original DNS request have to match the
 address family on the exit side?
  - I.e., suppose a server (say, bar.foo.com) somewhere is IPv6 only and
 offers only AAAA records, not A records.  Suppose we have transparent
 proxying and a client only supports IPv4, and requests an A record for
 bar.foo.com from our DNSPort.
  - What do we return, and what does the mapping we set up remember about
 it?  How would the behavior differ if the server had both A and AAAA
 records?

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/10468#comment:3>
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