** Tags added: server-todo

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https://bugs.launchpad.net/bugs/2042587

Title:
  jammy's version breaks existing dhcp scripts with relay

Status in dnsmasq package in Ubuntu:
  New
Status in dnsmasq source package in Jammy:
  Triaged

Bug description:
  When upgrading from focal to jammy, existing dnsmasq dhcp-scripts
  stopped working in an environment where a DHCP relay is in use.
  Instead of the expected client IP address, the script gets the _relay_
  IP address as an argument. From dnsmasq documentation for --dhcp-
  script:

  > The arguments to the process are "add", "old" or "del", the MAC
  address of the host (or DUID for IPv6) , the IP address, and the
  hostname, if known.

  I believe the change has been inadverently made in upstream commit
  527c3c7d0d3bb4bf5fad699f10cf0d1a45a54692
  
(https://thekelleys.org.uk/gitweb/?p=dnsmasq.git;a=blobdiff;f=src/helper.c;h=02340a01c00031db0cc682c8a4a279cfc1db574e;hp=d81de9622e6d484a264496b2cd3638b4e15e9677;hb=527c3c7d0d3bb4bf5fad699f10cf0d1a45a54692;hpb=fcb4dcaf7cc8a86ac2533b933161b6455f75bf8f)
  as the commit message only speaks about inet_ntoa replacement and not
  the behavioral change it also introduces (previously the relay address
  was only set to the environment variable, now it effectively overrides
  the prevoiusly set client's IP address).

  dnsmasq 2.86-1.1ubuntu0.3 / Ubuntu 22.04

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