[tor-bugs] #33240 [Core Tor/Tor]: Prop 312: 3.2.4. Use Own Hostname IPv6 Addresses

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#33240: Prop 312: 3.2.4. Use Own Hostname IPv6 Addresses
---------------------------+------------------------------------
 Reporter:  teor           |          Owner:  teor
     Type:  enhancement    |         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
---------------------------+------------------------------------
Description changed by teor:

Old description:

> If they don't have usable Address, ORPort, or interface addresses, relays
> (and bridges) should get their local hostname, look
> up its addresses, and use them as its IPv4 and IPv6 addresses.
>
> We propose to use the same underlying lookup functions to look up the
> IPv4
> and IPv6 addresses for:
>   * the Address torrc option (see section 3.2.1), and
>   * the local hostname.
> However, OS APIs typically only return a single hostname. (Rather than a
> separate hostname for IPv4 and IPv6.)
>
> The hostname lookup should ignore private addresses on public relays. If
> multiple IPv4 or IPv6 addresses are returned, the first public address
> from
> each family should be used.
>
> See proposal 312, section 3.2.4:
> https://gitweb.torproject.org/torspec.git/tree/proposals/312-relay-auto-
> ipv6-addr.txt#n408

New description:

 This ticket depends on `Address IPv6` support in #33233 and IPv6
 resolution support in #33234.

 If they don't have usable Address, ORPort, or interface addresses, relays
 (and bridges) should get their local hostname, look
 up its addresses, and use them as its IPv4 and IPv6 addresses.

 We propose to use the same underlying lookup functions to look up the IPv4
 and IPv6 addresses for:
   * the Address torrc option (see section 3.2.1), and
   * the local hostname.
 However, OS APIs typically only return a single hostname. (Rather than a
 separate hostname for IPv4 and IPv6.)

 The hostname lookup should ignore private addresses on public relays. If
 multiple IPv4 or IPv6 addresses are returned, the first public address
 from
 each family should be used.

 See proposal 312, section 3.2.4:
 https://gitweb.torproject.org/torspec.git/tree/proposals/312-relay-auto-
 ipv6-addr.txt#n408

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/33240#comment:4>
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