[tor-bugs] #17773 [Core Tor/Tor]: Should clients avoid using guards that lost the Guard flag?

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#17773: Should clients avoid using guards that lost the Guard flag?
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 Reporter:  arma               |          Owner:  arma
     Type:  enhancement        |         Status:  accepted
 Priority:  Medium             |      Milestone:  Tor: 0.2.???
Component:  Core Tor/Tor       |        Version:
 Severity:  Normal             |     Resolution:
 Keywords:  TorCoreTeam201606  |  Actual Points:
Parent ID:                     |         Points:  medium?
 Reviewer:                     |        Sponsor:
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Comment (by arma):

 Replying to [comment:18 cypherpunks]:
 > What is supposed to happen if the guard flag is dropped while the client
 is connected?

 I'm not sure what the code does, but I expect that it would leave existing
 circuits alone, and opt to use a different first hop when making future
 circuits.

 > What is supposed to happen if the guard is set manually? Will tor refuse
 to build circuits?

 If you put a relay in your EntryNodes list, Tor should never care whether
 it has the Guard flag. See the code snippet from asn above where it checks
 {{{routerset_contains_node(options->EntryNodes,node)}}}.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/17773#comment:21>
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