[reSIProcate] Windows Name Resolution in reSIP

[Scott Godin]

I've been looking into a way to get reSIP to use windows name resolution
along side with ares.  This would allow reSIP to resolve names using
Netbios, WINS and hosts file on windows systems.  The problem is that these
functions are synchronous and can block the stack.  
 
For now I've committed a solution that is synchronous - it works as follows:
-          to enable on a WIN32 system - add compile flag:
WIN32_SYNCRONOUS_RESOLUTION_ON_ARES_FAILURE
-          if ares DNS lookup fails then we fallback to Windows name
resolution
 
Another draw back of this is that if a name really doesn't exist then it
will take twice as long to detect it.  Ie. Ares needs to timeout then Win
API needs to timeout.
 
If anyone has any bright idea's on a slick way to make these windows name
resolution API's synchronous, then please share it.  Until I can find a good
solution it will remain a compile flag.
 
Thanks,
 
Scott
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