[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
---------------------------+------------------------------------
 Reporter:  teor           |          Owner:  teor
     Type:  task           |         Status:  assigned
 Priority:  Medium         |      Milestone:  Tor: 0.4.4.x-final
Component:  Core Tor/Tor   |        Version:
 Severity:  Normal         |     Resolution:
 Keywords:  prop312, ipv6  |  Actual Points:
Parent ID:  #33049         |         Points:  1
 Reviewer:                 |        Sponsor:  Sponsor55-must
---------------------------+------------------------------------

Old description:

> 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

New description:

 Once we have implemented IPv6 Addresses in #33233, and automatic IPv6
 ORPorts in #33246, 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

--

Comment (by teor):

 Note dependencies on #33233 and #33246.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/33235#comment:1>
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