[Dnsmasq-discuss] Support for DHCP option 125

~ Kunal Sharma ~ koolkunal at gmail.com
Fri Sep 14 17:03:03 BST 2007

Hi Simon,

Many thanks for replying. Basically, I'm trying to add support for the
DHCP requirements that are needed for DSL Forum's TR-111 standard,
in my gateway device.

>The existing support for non-vendor-identifying encapsulated options is
>in two places. The data gets laid out in the packet in the second half
>of do_options() in src/rfc2131.c.

I hope you're talking about do_opt() or do_req_options() because I don't
find do_options() in the code.

And yes, I'm aware of GNU GPL. I just meant to make sure the author
does not place any proprietary licence. So. I'll definitely share the source
once I'm done with this.

Thanks again,

On 9/14/07, Simon Kelley <simon at thekelleys.org.uk> wrote:
> ~ Kunal Sharma ~ wrote:
> > Hi Friends,
> >
> > I'm new to this list and I'm new to DNSMASQ. Hence, this query !
> >
> > I need to be able to add/enable support for DHCP option number 125 in
> > my current implementation. At this point, since I've not had a look
> > in, I'm not even aware that this is already there or not.
> >
> > Would anyone here be generous to help me with the following -
> >
> > 1) How to find out if this option is supported and/or enabled ?
> Asking here is good. The answer is that it's not supported, except in
> the sense that you can code absolutely any option as a sequence of hex
> octets. Since RFC3925 options are fairly complex, that's probably not a
> good solution unless you have one, very simple option to encapsulate.
> > 2) If this is supported but disabled, how do I enable it (some
> compilation
> > flag etc) ?
> N/A
> > 3) If I need to add support, how to go about it e.g.
> > general directions needed, not the spoon-feeding stuff.
> The existing support for non-vendor-identifying encapsulated options is
> in two places. The data gets laid out in the packet in the second half
> of do_options() in src/rfc2131.c. That's quite hairy code, but it should
> be extendable to option 125 without too many problems.
> dhcp-option lines in the config file and command line are parsed into a
> linked-list of struct dhcp_opt in parse_dhcp_opt() in src/option.c.
> That's hairy too (sorry!). option-60 encapsulated options look like:
> dhcp-option=vendor:<some vendor string>,<option data>
> That could be extended to cope with something like
> dhcp-option=vendor-id:<enterprise-number>,<option data>
> > Also, am I
> > freely allowed to make my own changes to DNSMASQ ?
> >
> dnsmasq is licensed under the GNU GPL, in the unlikely event that you're
> not familiar with that, Googling will find you several decades worth of
> reading very quickly. The deal is basically this: you can make changes
> to dnsmasq for your own use: if you sell/give the changed binary to
> anyone outside your organisation, you have to make the changed source
> code available as well (and under the same terms).
> If you add this functionality, I'd appreciate getting a copy of the patch.
> Cheers,
> Simon.
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