[Bug 1953014] Re: Return code for unsolicited arping is 1 instead of 0

[Sebastien Bacher]

** Changed in: iputils (Ubuntu Focal)
       Status: Incomplete => New

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Title:
  Return code for unsolicited arping is 1 instead of 0

Status in iputils package in Ubuntu:
  Fix Released
Status in iputils source package in Focal:
  New

Bug description:
  When running a gratuitous / unsolicited arp via "arping -U" on Ubuntu Focal
  a return code of 1 is given, instead of always 0 (as there is no arp reply expected).

  Focal:
  --- cut ---
  # arping -U -c1 -I eth0 127.0.0.1; echo "ReturnCode: $?"
  ARPING 127.0.0.1 from 127.0.0.1 eth0
  Sent 1 probes (1 broadcast(s))
  Received 0 response(s)
  ReturnCode: 1

  # arping -V
  arping from iputils s20190709
  --- cut ---

  see corresponding source at
  https://github.com/iputils/iputils/blob/13e00847176aa23683d68fce1d17ffb523510946/arping.c#L302.


  On Ubuntu Bionic this worked fine (and also does on Ubuntu Hirsute again BTW):
  --- cut ---
  arping -U -c 1 -I eth0 127.0.0.1; echo "ReturnCode: $?"
  ARPING 127.0.0.1 from 127.0.0.1 eth0
  Sent 1 probes (1 broadcast(s))
  Received 0 response(s)
  ReturnCode: 0

  # arping -V
  arping utility, iputils-s20161105
  --- cut ---

  see corresponding source for that version at
  https://github.com/iputils/iputils/blob/bffc0e957b98d626ab4cea218c89251201425442/arping.c#L329
  or for the version on Hirsute at
  https://github.com/iputils/iputils/blob/cc16da6b574ce6637f3e6e9ab3c1a728663006ff/arping.c#L302


  As you can see by looking at the source arping always statically
  returns a "0" for unsolicited.

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