[Bug 1772014] Re: netcat-openbsd does not allow setting source port

[Aki Rossi]

Oh, and this is Ubuntu 18.04, and package version 1.187-1.

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https://bugs.launchpad.net/bugs/1772014

Title:
  netcat-openbsd does not allow setting source port

Status in netcat-openbsd package in Ubuntu:
  New

Bug description:
  When connecting to a remote host, both the command-line help and man-
  page state that specifying `-p` will set the local port number.
  However, when I actually attempt to do it, only the usage text is
  printed:

  $ nc.openbsd -p 12345 localhost 12345
  usage: nc [-46CDdFhklNnrStUuvZz] [-I length] [-i interval] [-M ttl]
     [-m minttl] [-O length] [-P proxy_username] [-p source_port]
     [-q seconds] [-s source] [-T keyword] [-V rtable] [-W recvlimit] [-w timeout]
     [-X proxy_protocol] [-x proxy_address[:port]] 	  [destination] [port]

  This appears to be caused by an erroneous check on line 541 of
  netcat.c, introduced by `misc-failures-and-features.patch`. If I
  remove the check or undo the patch completely, the source port is set
  correctly, but remains bound after I close the connection. Meanwhile,
  netcat-traditional works as expected.

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