[tor-bugs] #11211 [Core Tor/Tor]: Multiple ServerTransportListenAddr entries should be allowed per transport.

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#11211: Multiple ServerTransportListenAddr entries should be allowed per transport.
-------------------------------------------------+-------------------------
 Reporter:  yawning                              |          Owner:  kaie
     Type:  enhancement                          |         Status:
                                                 |  needs_revision
 Priority:  Medium                               |      Milestone:  Tor:
                                                 |  0.3.0.x-final
Component:  Core Tor/Tor                         |        Version:  Tor:
                                                 |  unspecified
 Severity:  Normal                               |     Resolution:
 Keywords:  tor-bridge, pt, needs-proposal,      |  Actual Points:
  tor-pt, bridgedb-parsers, 028-triage, ipv6,    |
  tor-03-unspecified-201612                      |
Parent ID:  #10629                               |         Points:
 Reviewer:                                       |        Sponsor:  T/U
-------------------------------------------------+-------------------------

Comment (by dcf):

 Replying to [comment:10 kaie]:
 > I'm trying to contribute a fix for this issue.
 >
 > Would it be acceptable to use a different configuration syntax, that
 uses only a single line for each transport type, and allows multiple
 address:port combinations to be listed on the line, separated by space, as
 in the following example?
 >
 >   ServerTransportListenAddr obfs3 0.0.0.0:443 [::]:443

 This is a good idea, but I think it's more complicated than just giving a
 list to ServerTransportListenAddr. You would need to also make
 ServerTransportOptions be similarly split, which would probably require
 new syntax in torrc. It would also require a change to pt-spec, because
 there would need to be a rule or something that states which options
 pertain to which listening address when there are multiple ones.

 I've been frustrated by this in the past, too. For example, in
 comment:10:ticket:20348, I wanted to run three obfs4 bridges with slightly
 different configuration on the same IP address, and there's just no way to
 do it other than to run three instances of tor. It was probably a mistake
 for torrc to use the transport name as a key that links
 ServerTransportListenAddr and ServerTransportOptions, because that makes a
 built-in assumption that there's only one thing identified by that
 transport.

 Incidentally, it might be the the case that using only the IPv6 syntax
 already does what you want. On some systems `[::]` will listen on both
 IPv6 and IPv4, so you don't need to separately list 0.0.0.0.

--
Ticket URL: <https://trac.torproject.org/projects/tor/ticket/11211#comment:22>
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