[tor-bugs] #6411 [Tor]: Adding hidden services through control socket

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#6411: Adding hidden services through control socket
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     Reporter:           |      Owner:  yawning
  kevinevans             |     Status:  needs_review
         Type:           |  Milestone:  Tor: 0.2.7.x-final
  enhancement            |    Version:  Tor: 0.2.3.19-rc
     Priority:  normal   |   Keywords:  hidden-service control maybe-
    Component:  Tor      |  proposal tor-hs globalleaks-wants
   Resolution:           |  Parent ID:  #8993
Actual Points:           |
       Points:           |
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Comment (by special):

 There's no way to change the target ports for a service other than calling
 DEL_ONION and ADD_ONION again, which has side effects (like getting all
 new IPs, disruptions). This becomes even more relevant if we add client
 authentication data later, for example.

 Use case: I was thinking about modifying onionwrap[1] to monitor ports
 bound by its child process and forward all of them. It would sometimes
 need to add new ports.

 The obvious option is to allow ADD_ONION to update the properties (ports,
 detach?) of an existing service, but this is a problem for fully ephemeral
 services where the controller didn't even get a PK.

 But, it seems excessive to add CHANGE_ONION just for this case.

 It's also acceptable to ignore this problem, and if someone later thinks
 that we need a better solution than DEL/ADD, they can discuss and
 implement it.

 Thoughts?

 [1] https://github.com/Yawning/onionwrap

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/6411#comment:50>
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