[Bug 1104675] Re: Bad handling of multiple domainname options

[Chris Carlin]

This is actually a longstanding issue I've been having for years. At the
moment I have computers running 12.04 and 12.10, both showing the
behavior. The 12.10 computer is running isc-dhcp-client v.
4.2.4-1ubuntu10.1 for what it's worth.

But that made me realize I had a little server running Debian Wheezy,
and the problem is there too. That answers my question about whether
this behavior might be related to a Ubuntu-specific script.

The bug linked doesn't specifically address this. The bug seems to point
to a single dhcp option containing multiple domains, while what I have
is multiple dhcp options each with a single domain.

The bug did give a pointer to where in the code this stuff is parsed,
though, so maybe I can figure it out based on that.

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https://bugs.launchpad.net/bugs/1104675

Title:
  Bad handling of multiple domainname options

Status in “isc-dhcp” package in Ubuntu:
  New

Bug description:
  As far as I know, the dhcp standards do not allow for multiple
  Domainnames to be set through Option 15. My LInksys router doesn't
  care, though, and sends both the Domainname I gave it AND the
  Domainname my ISP gives it. Maybe this is non-standard, but it is what
  it is.

  isc-dhcp-client handles this in the worst possible way. It could
  choose one name or the other, or it could ignore both names when it
  sees the malfunction. Instead, it concatenates the names together,
  assuring that it ends up with an invalid name.

  From the below excerpt of dhcpdump I would end up with the domain name
  my.comhr.remote.com.

  OPTION:   6 (  4) DNS server                192.168.0.1
  OPTION:  15 ( 6) Domainname                my.com
  OPTION:  15 ( 13) Domainname                hr.remote.com
  ---------------------------------------------------------------------------

  In the end this gives me an invalid domain in search in resolv.conf.
  Ideally I'd end up with "search my.com hr.remote.com" there, but from
  scanning the scripts I can see how that wouldn't really work. Still,
  the concated domainname seems like a bad idea.

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