[reSIProcate] resip, ares, and IPv6

[Adam Roach]

To be clear, Brad Spencer actually took the effort to add conditional 
code to resip so that it can use c-ares. This was back in 2008 (although 
it looks like Byron did some fix-up earlier this year), so there might 
be some slight interface drift, but it shouldn't be major work to get 
things to work with the most recent c-ares library.

If you're using the Makefile-based build system, you simply add 
"--with-resolver=c-ares" to the ./configure script (or find and set the 
corresponding option when you run the script). I'm not certain if 
there's any support in the Visual Studio projects, but the basic idea is 
that you need to:

   1. Make sure USE_CARES is defined
   2. Make sure USE_ARES is *not* defined
   3. Make sure the c-ares headers and libraries are part of your build
      and link setup
   4. Make sure resip-ares headers and libraries are *not* part of your
      build and link setup

/a

On 5/11/11 10:08 AM, Byron Campen wrote:
> 	The ares code in resip is a fork of the original (and defunct) ares, as I understand it. c-ares is also a fork of the original ares project, and there was some work on resip a while back to make it compatible with c-ares 1.6. I am not sure how easy it would be to rebase our resip-ares code on the latest c-ares, but it is probably a good thing to do.
>
> Best regards,
> Byron Campen
>
>> I haven't tried it, no ..
>>
>> Though I did notice on the c-ares page that IPv6 support was recently added.
>>
>> I'm kind of new to this area, what is the history around ares vs. c-ares
>> anyways? Is c-ares a fork? Do you think it would be easily integratable
>> with resip?
>>
>> And what happened to vanilla ares? I can't find a webpage anywhere..
>>
>>
>> On 11-05-10 08:53 PM, Byron Campen wrote:
>>> 	Have you tried with c-ares? I know that you guys need the modifications in contrib/ares, but maybe we can patch up the most recent c-ares to suit your needs.
>>>
>>> Best regards,
>>> Byron Campen
>>>
>>>> Hello,
>>>>
>>>> I recently found a problem with our version of ares which is used by
>>>> resip. I'll try to explain.
>>>>
>>>> I am working on IPv6 testcases. One of my testcases involves switching
>>>> off IPv4 stack support and going to IPv6 only configuration.
>>>>
>>>> When I do this, I notice that ares does not recognize any DNS servers
>>>> which are configured for IPv6.
>>>>
>>>> After a lengthy debugging session, I traced the fault to a method
>>>> "init_by_default" inside of ares_init.c. In that method, the technique
>>>> of calling "GetNetworkParams" is used in order to query windows for its
>>>> DNS configuration. But, as the following website suggests:
>>>>
>>>> http://www.winsocketdotnetworkprogramming.com/winsock2programming/winsock2advancediphelperfunction13.html
>>>>
>>>> The GetNetworkParams probably does not return IPv6 related configuration
>>>> information. Instead, they recommend using GetAdaptersAddresses() instead.
>>>>
>>>> So, I'm wondering if anyone else has found this problem, if there is a
>>>> patch that was submitted, or .. if there is just a newer version of ares
>>>> somewhere that we need to update to?
>>>>
>>>> Awaiting your advice,
>>>> -- 
>>>> David Stuart, CounterPath
>>>> Email: dstuart (at) counterpath (dot) com
>>>> Phone: (613) 254-8886 x2234  Web: http://www.counterpath.com/
>>>> Address: 310 - 350 Terry Fox Drive, Kanata Ontario, K2K 2P5
>>>> _______________________________________________
>>>> resiprocate-devel mailing list
>>>> resiprocate-devel at resiprocate.org
>>>> https://list.resiprocate.org/mailman/listinfo/resiprocate-devel
>> -- 
>> David Stuart, CounterPath
>> Email: dstuart (at) counterpath (dot) com
>> Phone: (613) 254-8886 x2234  Web: http://www.counterpath.com/
>> Address: 310 - 350 Terry Fox Drive, Kanata Ontario, K2K 2P5
> _______________________________________________
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