[Bug 1656785] Re: nc -d -l does not return data (only empty strings)

[Stefan Bader]

Added to the Debian bug report. Basically the output problem is related to a Debian add-on patch to introduce the -q# option (delayed exit) which has been incorrectly adapted to the new code.
However while testing a possible solution I found that upstream changed the default behaviour of nc to not shutdown the net socket when the local input stream closes. Now this requires using -N to get this back.

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Title:
  nc -d -l does not return data (only empty strings)

Status in netcat-openbsd package in Ubuntu:
  New
Status in netcat-openbsd package in Debian:
  New

Bug description:
  The Zesty (17.04) version of nc (1.130-1ubuntu1) no longer returns the
  received data when using the '-d' (do not listen on stdin) flag
  together with the '-l' (listen on socket) flag. This used to work in
  previous releases (1.105-7ubuntu1 Trusty-Yakkety). In fact, in the
  previous version, the '-d' flag seems to be required to make the data
  transfer more reliable in scripts.

  Testcase: Attached script passes on older versions, fails with the
  current version of nc.

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