[tor-bugs] #23588 [Core Tor/Tor]: Write fascist_firewall_choose_address_ls() and use it in hs_get_extend_info_from_lspecs()

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#23588: Write fascist_firewall_choose_address_ls() and use it in
hs_get_extend_info_from_lspecs()
-------------------------------------------------+-------------------------
 Reporter:  teor                                 |          Owner:  neel
     Type:  defect                               |         Status:
                                                 |  needs_revision
 Priority:  Medium                               |      Milestone:  Tor:
                                                 |  0.3.5.x-final
Component:  Core Tor/Tor                         |        Version:
 Severity:  Normal                               |     Resolution:
 Keywords:  prop224, tor-hs, single-onion,       |  Actual Points:
  ipv6, 034-triage-20180328,                     |
  034-removed-20180328                           |
Parent ID:  #23493                               |         Points:  1
 Reviewer:  teor                                 |        Sponsor:
-------------------------------------------------+-------------------------

Comment (by teor):

 Replying to [comment:36 neel]:
 > I think I know what the bug for `hs-v23-ipv6-md` is: some addresses are
 being marked as invalid as they don't make it through
 `fascist_firewall_allows_address_ap()` (I believe the main Tor codebase
 does not make addresses go though this now, nor does my old "simplified"
 address choosing code that got abandoned).

 This issue sounds like a bug in fascist_firewall_allows_address_ap(), or a
 bug in how we're using fascist_firewall_allows_address_ap().

 (The v2 onion service code uses fascist_firewall_allows_address_ap() and
 it works.)

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/23588#comment:44>
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