[tor-bugs] #11727 [Torsocks]: Support shared onion pool for DNS resolution in separate process

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#11727: Support shared onion pool for DNS resolution in separate process
-------------------------+-------------------------
 Reporter:  dgoulet      |          Owner:  dgoulet
     Type:  enhancement  |         Status:  new
 Priority:  normal       |      Milestone:
Component:  Torsocks     |        Version:
 Keywords:               |  Actual Points:
Parent ID:               |         Points:
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 So it turns out that in irssi is doing DNS resolution in an other process
 and passing the result back to the first process which will make the
 connection.

 This means that the two process have two distinct onion pools so the
 process doing the DNS resolution will store the onion address with the
 reserved cookie but the other process, when connecting using that cookie,
 will be unable to find the onion address in its pool.

 One solution I have in mind is to create that onion pool in a shared
 memory (SHM) and hijack the clone/fork symbol so when we detect a new
 process we can set the onion pool reference in it thus sharing the pool
 across processes that have a common parent.

 I have a PoC that works but maybe there could be an IPC approach instead.

--
Ticket URL: <https://trac.torproject.org/projects/tor/ticket/11727>
Tor Bug Tracker & Wiki <https://trac.torproject.org/>
The Tor Project: anonymity online
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