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

[Stefan Bader]

Public bug reported:

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.

** Affects: netcat-openbsd (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: zesty

** Attachment added: "Testscript"
   https://bugs.launchpad.net/bugs/1656785/+attachment/4804928/+files/nc-test

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https://bugs.launchpad.net/bugs/1656785

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

Status in netcat-openbsd package in Ubuntu:
  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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