[tor-bugs] #16774 [Tor]: Add fallback directories to GETINFO

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#16774: Add fallback directories to GETINFO
-------------------------------------+------------------------------------
 Reporter:  teor                     |          Owner:
     Type:  enhancement              |         Status:  new
 Priority:  Medium                   |      Milestone:  Tor: 0.2.8.x-final
Component:  Tor                      |        Version:  Tor: 0.2.7.2-alpha
 Severity:  Normal                   |     Resolution:
 Keywords:  lorax, easy, 028-triage  |  Actual Points:
Parent ID:                           |         Points:  medium
  Sponsor:                           |
-------------------------------------+------------------------------------
Changes (by gtank):

 * severity:   => Normal


Comment:

 Not sure how close #15775 is, but I wrote some code on top of teor's
 `feature15775-fallback-v9` branch to add FallbackDir lines in
 `config/defaults`.

 With the most recently posted //fallback_dirs.inc// it looks like
 {{{
 [...]
 DirAuthority "longclaw orport=443
 v3ident=23D15D965BC35114467363C165C4F724B64B4F66 199.254.238.52:80 74A9
 1064 6BCE EFBC D2E8 74FC 1DC9 9743 0F96 8145"
 FallbackDir "orport=9001 E9C8154418544764619D2CCD0596B355D7DFF236
 5.9.123.81:9030"
 FallbackDir "orport=9010 BF0FB582E37F738CD33C3651125F2772705BB8E8
 148.251.190.229:9030"
 FallbackDir "orport=443 963ADC0137505151C1AFA6757DD2367EDEEC7B62
 124.6.36.193:80"
 [...]
 }}}

 https://github.com/gtank/tor.git on branch `feature16774`

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/16774#comment:4>
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