[tor-bugs] #32034 [Core Tor/Tor]: tor reads PT protocol messages from stderr

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#32034: tor reads PT protocol messages from stderr
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 Reporter:  dcf           |          Owner:  neel
     Type:  defect        |         Status:  new
 Priority:  Medium        |      Milestone:  Tor: 0.4.3.x-final
Component:  Core Tor/Tor  |        Version:  Tor: 0.4.2.2-alpha
 Severity:  Normal        |     Resolution:
 Keywords:  tor-pt        |  Actual Points:
Parent ID:                |         Points:
 Reviewer:                |        Sponsor:
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Comment (by ahf):

 I think the example script have a bug: The `echo`'s in the subshell writes
 to standard out and you redirect all output from the subshell from
 standard error to standard out, where instead it should be redirect all
 output from the subshell's standard out to standard error, so `1>&2`
 instead of `2>&1`.

 The example with `wc` also shows this, as the redirect to `/dev/null`
 should still show the three lines to standard error:

 {{{
 user at tor-dev:~$ ./test-fake-pt.sh > /dev/null | wc -l
 0
 VERSION 1
 SMETHOD testpt 127.0.0.1:9999
 SMETHODS DONE
 }}}

 Tor's PT standard error handler does not send the standard error messages
 into the PT state machine handler and logs the errors with the warning log
 level. I do think that's a bit higher than what we want for this kind of
 event, so I'm submitting a patch in a moment that lowers the log level for
 PT standard error messages from warning to debug.

--
Ticket URL: <https://trac.torproject.org/projects/tor/ticket/32034#comment:5>
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