[Dnsmasq-discuss] dnsmasq proxydhcp and UEFI [PATCH]

[Jarek Polok]

Hello

On 03/04/2016 10:41 PM, Simon Kelley wrote:
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> Didn't want to ignore this, so this is just to acknowledge your patch.
> I need some more time to work back into PXE internals and undertsnad
> exactly what's going on. Will return soon with questions.

Sure, it would be nice to have this proxy DHCP problem solved
in dnsmasq since now it cannot be used for PXE booting (only in
proxy DHCP mode of course) of UEFI platforms.

In mean time I've been able to test the patch on ~ 30 more hardware
models: BIOS/UEFI (including UEFI on arm64) and it seems to
work as expected.


Best Regards

Jarek

>
>
>
> Cheers,
>
> Simon.
>
>
>
> On 02/03/16 09:17, Jarek Polok wrote:
>> Hello
>>
>> I've seen in list mail archives that the problem of UEFI systems
>> not booting while using PXE boot menu has been discussed in the
>> past already:
>>
>> http://lists.thekelleys.org.uk/pipermail/dnsmasq-discuss/2015q4/010007
> .html
>>
>>   and a patch was proposed.
>>
>> I tried that patch but for some UEFI firmwares it did not work for
>> me.
>>
>> Tracing reply proxyDHCP packet from a Microsoft WDS server I was
>> able to change the patch a little and it seems to make proxyDHCP
>> work for all clients I've been able to test with (4 different
>> hardware models and qemu-kvm with OVMF (Tianocore) firmware).
>>
>> In addition to filling in siaddr and bootfile in the reply header
>> my version fills also sname then avoids adding option 43 (some
>> clients did not boot without sname set..)
>>
>> This is how WDS replies on 4011 for PXE requests for all BIOS/EFI
>> clients ..
>>
>> (WDS also adds option 252, filled with text representation of data
>> possibly needed by WDS bootloader , seems to contain architecture
>> path, some (G)UUID and BCD location ?)
>>
>> In the attachment you will find my version of the patch, adding
>> 'pxe-menu-skip=<CSA>' option which makes dnsmasq to 'shortcut' boot
>> process sending back to pxe client first matching (by tag and CSA)
>> pxe-service when acting in proxy-DHCP mode.
>>
>> Dear maintainer: would you please consider adding this patch to
>> dnsmasq ?
>>
>>
>> Best Regards
>>
>> Jarek
>>
>> __ ------------------------------------------------------- _
>> Jaroslaw_Polok ___________________ CERN - IT/CM/LCS _ _
>> http://cern.ch/~jpolok ________ tel_+41_22_767_1834 _
>> ______________________________________+41_75_411_9487 _
>>
>>
>>
>>
>> _______________________________________________ Dnsmasq-discuss
>> mailing list Dnsmasq-discuss at lists.thekelleys.org.uk
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-- 
__
-------------------------------------------------------
_ Jaroslaw_Polok ___________________ CERN - IT/CM/LCS _
_ http://cern.ch/~jpolok ________ tel_+41_22_767_1834 _
______________________________________+41_75_411_9487 _