[Kea-users] Is KEA trying to do some smart caching?

Marcin Siodelski marcin at isc.org
Mon Apr 25 12:29:13 UTC 2016


Hi Ola,

In this POC, do you have option 43 configured in Kea configuration file?

Marcin Siodelski
ISC

On 20.04.2016 11:48, Ola Thoresen wrote:
> Just did some more debugging, and made a minimal "proof of concept":
> 
> int pkt4_send(CalloutHandle& handle) {
>         Pkt4Ptr response4_ptr;
>         handle.getArgument("response4", response4_ptr);
> 
>         interesting << "Got argument " << "\n";
>         flush(interesting);
> 
>         OptionPtr x_opt_ptr = response4_ptr->getOption(43);
>         interesting << "Got 43 " << "\n";
>         flush(interesting);
> 
>         if (x_opt_ptr) {
>                 interesting << "Val " << x_opt_ptr->toString() << "\n";
>                 flush(interesting);
> 
>                 OptionPtr x_sub_ptr = x_opt_ptr->getOption(1);
>                 interesting << "Got 01 " << "\n";
>                 flush(interesting);
> 
>                 if (x_sub_ptr) {
>                         interesting << "Val " << x_sub_ptr->toString()
> << "\n";
>                         flush(interesting);
> 
>                         interesting << "Straight from the argument: " <<
> x_sub_ptr->toString() << "\n";
>                         flush(interesting);
> 
> 
>                         x_opt_ptr->delOption(1);
>                         x_sub_ptr.reset(new OptionString(Option::V4, 1,
> "MyValue"));
>                         x_opt_ptr->addOption(x_sub_ptr);
> 
>                         interesting << "And now it is: " <<
> x_opt_ptr->toString() << "\n";
>                         flush(interesting);
>                 }
>         }
> }
> 
> 
> 
> This gives me the following output:
> 
> ====== 1. DHCP-packet after restart of kea-dhcp4: =====
> 
> Got argument
> Got 43
> Val type=043, len=041:,
> options:
>   type=001, len=033: "cpe/config?hostname=@OPTION_82_2@" (string)
>   type=003, len=004: "http" (string)
> Got 01
> Val cpe/config?hostname=@OPTION_82_2@
> Straight from the argument: cpe/config?hostname=@OPTION_82_2@
> And now it is: type=043, len=015:,
> options:
>   type=001, len=007: "MyValue" (string)
>   type=003, len=004: "http" (string)
> 
> 
> 
> ====== 2. DHCP-packet =====
> 
> Got argument
> Got 43
> Val type=043, len=015:,
> options:
>   type=001, len=007: "MyValue" (string)
>   type=003, len=004: "http" (string)
> Got 01
> Val MyValue
> Straight from the argument: MyValue
> And now it is: type=043, len=015:,
> options:
>   type=001, len=007: "MyValue" (string)
>   type=003, len=004: "http" (string)
> 
> 
> 
> 
> I am no C++-expert, so it is probably me who are changing a value I
> should not change, but to me it looks like what I get from
>  handle.getArgument("response4", response4_ptr);
> still contains data from the previous DHCP-packet is sent.
> 
> 
> 
> Rgds.
> 
> Ola Thoresen
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> Kea-users at lists.isc.org
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