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[tor-bugs] #11044 [Tor]: No consensus results in empty 'GETINFO ns/name/*' responses

#11044: No consensus results in empty 'GETINFO ns/name/*' responses
--------------------+---------------------
 Reporter:  atagar  |          Owner:
     Type:  defect  |         Status:  new
 Priority:  minor   |      Milestone:
Component:  Tor     |        Version:
 Keywords:          |  Actual Points:
Parent ID:          |         Points:
--------------------+---------------------
 Hi Nick, spotted an interesting tor oddity during my flight (due to not
 having any network connectivity). When calling 'GETINFO ns/name/blarg'
 without a cached consensus it returns an empty string rather than the
 expected "Unrecognized key" response.

 Repro details...

 1. With a data directory containing a cached consensus things work as
 expected...

 {{{
 % telnet localhost 9051
 Trying 127.0.0.1...
 Connected to localhost.
 Escape character is '^]'.
 AUTHENTICATE
 250 OK
 GETINFO ns/all
 [ ... lots of output... ]
 GETINFO ns/name/blarg
 552 Unrecognized key "ns/name/blarg"
 }}}

 2. Blow away your data directory when you lack network connectivity.

 {{{
 % mv ~/.tor ~/.tor_bak
 % mkdir ~/.tor
 % cp ~/.tor_bak/torrc ~/.tor
 % cat ~/.tor/torrc
 ControlPort 9051
 % tor -f ~/.tor/torrc
 ...
 }}}

 3. Now GETINFO for 'ns/all' and any requrest for a relay returns an empty
 response.

 {{{
 % telnet localhost 9051
 Trying 127.0.0.1...
 Connected to localhost.
 Escape character is '^]'.
 AUTHENTICATE
 250 OK
 GETINFO ns/all
 250-ns/all=
 250 OK
 GETINFO ns/name/blarg
 250-ns/name/blarg=
 250 OK
 }}}

 Interestingly this only seems to concern router status entries. Server
 descriptors and microdescriptors give us a 'Unrecognized key'...

 {{{
 GETINFO desc/name/blarg
 552 Unrecognized key "desc/name/blarg"
 GETINFO md/name/blarg
 552 Unrecognized key "md/name/blarg"
 }}}

 For my part I noticed this because it caused an integ testing failure
 during my flight...

 {{{
 ======================================================================
 ERROR: test_get_network_status
 ----------------------------------------------------------------------
 Traceback (most recent call last):
   File "/home/atagar/Desktop/stem/test/integ/control/controller.py", line
 977, in test_get_network_status
     self.assertRaises(stem.ControllerError, controller.get_network_status,
 "blargg")
   File "/usr/lib/python2.7/unittest/case.py", line 471, in assertRaises
     callableObj(*args, **kwargs)
   File "/home/atagar/Desktop/stem/stem/control.py", line 1427, in
 get_network_status
     raise exc
 ValueError: Router status entries (v3) must have a 'r' line:
 }}}

 This doesn't seem like the right tor behavior but if you think it is I can
 simply have stem check for the empty string. :)

 Cheers! -Damian

--
Ticket URL: <https://trac.torproject.org/projects/tor/ticket/11044>
Tor Bug Tracker & Wiki <https://trac.torproject.org/>
The Tor Project: anonymity online
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