[tor-bugs] #14219 [Tor]: Visiting a down hidden service that was recently up results in many hsdesc fetches

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#14219: Visiting a down hidden service that was recently up results in many hsdesc
fetches
------------------------------+------------------------------
 Reporter:  arma              |          Owner:
     Type:  defect            |         Status:  new
 Priority:  normal            |      Milestone:  Tor: 0.2.???
Component:  Tor               |        Version:
 Keywords:  SponsorR, tor-hs  |  Actual Points:
Parent ID:                    |         Points:
------------------------------+------------------------------
 Run a hidden service, so it correctly establishes intro points and uploads
 its descriptor correctly. Then shut off the hidden service.

 Then try to visit it, and watch your HS_DESC control events. You get
 something like:
 {{{
 1421275707.240294 [torctl-log] localhost:9051 650 HS_DESC REQUESTED
 yjiqkj6p7drpiwyq NO_AUTH
 $0011BD2485AD45D984EC4159C88FC066E5E3300E~CalyxInstitute14
 776oil3sjfhbxkj6eewqu3mtzrsnesm2
 1421275708.081418 [torctl-log] localhost:9051 650 HS_DESC RECEIVED
 yjiqkj6p7drpiwyq NO_AUTH
 $0011BD2485AD45D984EC4159C88FC066E5E3300E~CalyxInstitute14
 1421275710.275964 [torctl-log] localhost:9051 650 HS_DESC REQUESTED
 yjiqkj6p7drpiwyq NO_AUTH
 $1D6A27AED313662E35F550B212335D4797DCCDF6~CriptoLabTORRelay3
 dvcsya66ae4vvzekabjojyrgkdcttnfh
 1421275711.550731 [torctl-log] localhost:9051 650 HS_DESC RECEIVED
 yjiqkj6p7drpiwyq NO_AUTH
 $1D6A27AED313662E35F550B212335D4797DCCDF6~CriptoLabTORRelay3
 1421275713.156023 [torctl-log] localhost:9051 650 HS_DESC REQUESTED
 yjiqkj6p7drpiwyq NO_AUTH
 $002121252467538C9DA1BC2378997E64629814F6~metroholografix
 776oil3sjfhbxkj6eewqu3mtzrsnesm2
 1421275713.767901 [torctl-log] localhost:9051 650 HS_DESC RECEIVED
 yjiqkj6p7drpiwyq NO_AUTH
 $002121252467538C9DA1BC2378997E64629814F6~metroholografix
 1421275716.254822 [torctl-log] localhost:9051 650 HS_DESC REQUESTED
 yjiqkj6p7drpiwyq NO_AUTH
 $000F18AC2CDAE4C710BA0898DC9E21E72E0117D8~TorNinurtaName
 776oil3sjfhbxkj6eewqu3mtzrsnesm2
 1421275717.405024 [torctl-log] localhost:9051 650 HS_DESC RECEIVED
 yjiqkj6p7drpiwyq NO_AUTH
 $000F18AC2CDAE4C710BA0898DC9E21E72E0117D8~TorNinurtaName
 }}}

 In this case I fetched the hsdesc four times for the service. According to
 the original design, I was supposed to fetch it twice: that is, I fetch it
 once, try all the intro points, once they've all failed, I fetch it once
 more just to see if it changed, and if it didn't change, I should stop and
 fail right then.

 So: is there a bug where we continue rather than failing? Or is the
 descriptor that I receive different in each case? What's going on?

--
Ticket URL: <https://trac.torproject.org/projects/tor/ticket/14219>
Tor Bug Tracker & Wiki <https://trac.torproject.org/>
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