[tor-bugs] #17948 [Tor]: HiddenServicePort should connect to localhost by default

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#17948: HiddenServicePort should connect to localhost by default
-------------------------+------------------------------------
 Reporter:  teor         |          Owner:  teor
     Type:  enhancement  |         Status:  assigned
 Priority:  Medium       |      Milestone:  Tor: 0.2.8.x-final
Component:  Tor          |        Version:
 Severity:  Normal       |     Resolution:
 Keywords:  ipv6         |  Actual Points:
Parent ID:               |         Points:
  Sponsor:               |
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Changes (by teor):

 * owner:   => teor
 * status:  new => assigned


Comment:

 I think there's a better algorithm here that doesn't require address
 resolution:
 * check for interface addresses in 127/8 and ::1
 * try to connect to an address in 127/8
   * if there are multiple addresses, choose the one closest to 127.0.0.1
   * if no IPv4 or IPv6 addresses can be discovered on the system, try
 127.0.0.1
 * if the first connection fails , try to connect to ::1 if
   * ::1 is present on the system, or
   * no IPv4 or IPv6 addresses can be discovered on the system

 This supports IPv4 and IPv6, and preserves the existing IPv4 127.0.0.1
 default behaviour, and the existing preference for IPv4 over IPv6, yet
 also supports IPv6-only systems.

 See https://trac.torproject.org/projects/tor/ticket/17901#comment:16 for
 the related behaviour in #17901.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/17948#comment:1>
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