[tor-bugs] #33235 [Core Tor/Tor]: Proposal 312: 3.2.1. Test Address torrc Option Configurations

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#33235: Proposal 312: 3.2.1. Test Address torrc Option Configurations
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     Reporter:  teor            |      Owner:  teor
         Type:  task            |     Status:  assigned
     Priority:  Medium          |  Milestone:  Tor: 0.4.4.x-final
    Component:  Core Tor/Tor    |    Version:
     Severity:  Normal          |   Keywords:  prop312, ipv6
Actual Points:                  |  Parent ID:  #33049
       Points:  1               |   Reviewer:
      Sponsor:  Sponsor55-must  |
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 Tor should support the following Address configurations:
   A. IPv4 Address / hostname (for IPv6 only),
   B. IPv6 Address / hostname (for IPv4 only),
   C. IPv4 Address only / try to guess IPv6, then check its reachability
      (see section 4.3.1 in [Proposal 311: Relay IPv6 Reachability]), and
   D. IPv6 Address only / guess IPv4, then its reachability must succeed.
 There are also similar configurations where a hostname is configured, but
 it only provides IPv4 or IPv6 addresses.

 Combination C is the most common legacy configuration. We want to
 support the following outcomes for legacy configurations:
   * automatic upgrades to guessed and reachable IPv6 addresses,
   * continuing to operate on IPv4 when the IPv6 address can't be guessed,
     and
   * continuing to operate on IPv4 when the IPv6 address has been guessed,
     but it is unreachable.

 See proposal 312, section 3.2.1, testing notes:
 ​https://gitweb.torproject.org/torspec.git/tree/proposals/312-relay-auto-
 ipv6-addr.txt#n270

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/33235>
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