[Serdev] rtpproxy patch for checking src and ruri has the same ip address

[Maxim Sobolev]

Thanks, I'll take a look at it later.

-Maxim

Richard wrote:
> Hi,
> 
> This is a patch of nathelper.c to check if src ip of a
> message is the same of the destination uri. A new
> function "same_nated_device" is used to check if two
> IP phones are behind the same NAT and nated to the
> same address. If they are, no need to use rtpproxy or
> mediaproxy, they can see each other's media port. It
> can be called everywhere, but for an normal INVITE, it
> only makes sense to be called after
> lookup("location"), i.e. the ruri is changed to the
> callee phone's ip address.
> 
> There is a thread about the limitation of this test.
> http://lists.iptel.org/pipermail/serusers/2004-July/009547.html
> 
> If it deems useful, it can extended to support more
> complex setup. For example, a netmask can be used to
> compare the src and ruri ip address. So it can support
> if the phones are assigned a block of external ip
> address, not just a single one. This mask can be saved
> in the table "domain" in mysql. So each domain can
> have its own netmask. A 32 bit mask checks the same ip
> address. A mask of >=33 may indicate that two domains
> can have same nated IP, so it always return false.
> 
> The implementation may not be the optimal way due to
> my limited understanding of ser. It should support
> ipv6 though.
> 
> Thanks,
> Richard
> 
> 
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