[tor-bugs] #11810 [Torsocks]: Connection through torsocks(1) impossible

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#11810: Connection through torsocks(1) impossible
----------------------+-------------------------------
 Reporter:  michael   |          Owner:  dgoulet
     Type:  defect    |         Status:  new
 Priority:  normal    |      Milestone:
Component:  Torsocks  |        Version:  Tor: 0.2.4.20
 Keywords:            |  Actual Points:
Parent ID:            |         Points:
----------------------+-------------------------------
 After installing the recent Ubuntu 14.04 AMD64 desktop release (LTS) I
 went about testing tor(1) and torsocks(1) and saw this:

 WITHOUT TOR

 $svn co http://svn.apache.org/repos/asf/subversion/trunk subversion
 A    subversion/notes
 A    subversion/notes/commit-access-templates
 A    subversion/notes/api-errata
 A    subversion/notes/api-errata/1.7
 A    subversion/notes/api-errata/1.8
 [...]

 WITH TOR

 $torsocks svn co http://svn.apache.org/repos/asf/subversion/trunk
 subversion
 svn: E120108: Unable to connect to a repository at URL
 'http://svn.apache.org/repos/asf/subversion/trunk'
 svn: E120108: Error running context: The server unexpectedly closed the
 connection.

 Since the OS installation is brand new and plain vanilla (no network
 bridges, VPNs, custom routing, or even a single service configured except
 for Tor) it seems a problem lies in the Tor software (either the service
 itself or the Socks wrapper.)

 IMPORTANT CLUE

 The svn(1) symptom above does not appear when replacing with git(1).

 DIAGNOSIS

 Running commands through torsocks(1) showing the symptom while inspecting
 with strace(1) reveals typical socket(2), fcntl(2), fstat(2),
 setsockopt(2), getpeername(2), and connect(2) to a tor(1) service running
 on localhost:9050 as usual. What might be atypical is that ENOTCONN and
 EINPROGRESS are returned in the way indicated by bug #8066 [1]. A late
 comment in #8066 refers in turn to #3711 [2], which are both leads.

 [1] https://trac.torproject.org/projects/tor/ticket/8066/
 [2] https://trac.torproject.org/projects/tor/ticket/3711/

 LINUX DISTROS

 Due to time constraints, I wasn't able to build tor(1) and torsocks(1)
 from source (at git.torproject.org) so there's a small chance that the bug
 has been fixed although no bug report exists to support this theory. It
 doesn't solve the problem of integrating whichever solution exists into
 leading Linux distributions however, which are still bundling the flawed
 version.

--
Ticket URL: <https://trac.torproject.org/projects/tor/ticket/11810>
Tor Bug Tracker & Wiki <https://trac.torproject.org/>
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