Ubuntu update to isc-dhcp-server seems to have broken config file processing

[Glenn Satchell]

They seem to have fixed that bug on Launchpad 
(https://bugs.launchpad.net/bugs/1930917), so good news for those that 
like to use the absolute latest releases :)

This bug was fixed in the package isc-dhcp - 4.4.1-2.2ubuntu8

---------------
isc-dhcp (4.4.1-2.2ubuntu8) impish; urgency=medium
   * Fix regression caused by rebuild with newer toolchain (LP: #1930917)
     - debian/rules: build with -fno-strict-aliasing.

regards,
Glenn

On 2021-06-07 23:52, bls s wrote:
> Response from Ubuntu on Launchpad 
> (https://bugs.launchpad.net/bugs/1930917):
> 
> I can confirm the update introduced a regression on Hirsute (and
> Impish I presume). Focal and Groovy work properly. Unfortunately, it's
> not related to the security patch, but it stems from the package being
> rebuilt with the newer toolchain in Hirsute, so removing the patch
> won't fix the issue.
> 
> I am currently investigating how to fix this.
> 
> ** Also affects: isc-dhcp (Ubuntu Hirsute)
>    Importance: Undecided
>        Status: New
> 
> ** Also affects: isc-dhcp (Ubuntu Impish)
>    Importance: Undecided
>        Status: Confirmed
> 
> ** Changed in: isc-dhcp (Ubuntu Hirsute)
>        Status: New => Confirmed
> 
> ** Changed in: isc-dhcp (Ubuntu Hirsute)
>      Assignee: (unassigned) => Marc Deslauriers (mdeslaur)
> 
> ** Changed in: isc-dhcp (Ubuntu Impish)
>      Assignee: (unassigned) => Marc Deslauriers (mdeslaur)
> 
> ** Changed in: isc-dhcp (Ubuntu Hirsute)
>    Importance: Undecided => Critical
> 
> ** Changed in: isc-dhcp (Ubuntu Impish)
>    Importance: Undecided => Critical
> 
> -----Original Message-----
> From: dhcp-users <dhcp-users-bounces at lists.isc.org> On Behalf Of bls s
> Sent: Friday, June 4, 2021 7:02 AM
> To: Users of ISC DHCP <dhcp-users at lists.isc.org>
> Subject: RE: Ubuntu update to isc-dhcp-server seems to have broken
> config file processing
> 
> Thanks, Simon for confirming my understanding.
> 
> Yes, have backed off to the previous version and it works, so there's
> a workaround.
> 
> I'm off to sort out how to file an actual bug report on Ubuntu in the
> hope that they revert the change (whatever it is!).
> 
> Benn
> 
> -----Original Message-----
> From: dhcp-users <dhcp-users-bounces at lists.isc.org> On Behalf Of Simon 
> Hobson
> Sent: Friday, June 4, 2021 5:03 AM
> To: Users of ISC DHCP <dhcp-users at lists.isc.org>
> Subject: Re: Ubuntu update to isc-dhcp-server seems to have broken
> config file processing
> 
> bls s <bls3427 at outlook.com> wrote:
> 
>> I'm using isc-dhcp-server 4.4.1-2 on RasPiOS Buster, and it's working 
>> fine with the following subnet declaration:
>> 
>> subnet 192.168.92.0 netmask 255.255.255.0 {
>>     option domain-search "foo.com", "dyn.foo.com";
>>     option broadcast-address 192.168.92.255;
>>     allow duplicates;
>>     ddns-updates off;
>>     pool {
>>         ddns-updates on;
>>         allow unknown-clients;
>>         option domain-name "dyn.foo.com";
>>         ddns-rev-domainname "dhcp";
>>         default-lease-time 86400;
>>         max-lease-time 86400;
>>         range 192.168.92.101 192.168.92.127;
>>     }
>> }
> 
> That looks fine
> 
>> This same subnet config worked on Ubuntu 21.04 a couple of weeks ago, 
>> with isc-dhcp-server V4.4.1-2.2-ubuntu6 on it. Today I updated on 
>> Ubuntu, got isc-dhcp-server V4.4.1-2.2ubuntu6.1 and now 
>> isc-dhcp-server complains about "Can't clone pool group".
>> 
>> I found that I can put the pool declaration outside of the subnet 
>> declaration on Ubuntu, and it works correctly. Unfortunately, doing 
>> this on RasPiOS fails!
> 
> Having a pool outside of a subnet isn't a valid config. It may appear
> to work, as do some other config errors, but may cause some really
> "interesting" issues.
> 
>> Am I totally using subnet and pool incorrectly, or is this an 
>> incompatible change in isc-dhcp-server? And, is it an intended change 
>> coming to mainline isc-dhcp-server or did Ubuntu bork it?
> 
> I'd be thinking that there's something changed in the Ubuntu version.
> Can you roll-back to the earlier version and try it again ?
> 
> Simon
> 
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