[reSIProcate] WinCompat::determineSourceInterfaceWithoutIPv6(const GenericIPAddress& destination)

[Dmytro Bogovych]

Greetings.

I tried to run simple user agent on the local interface 192.168.0.1 (MS  
Loopback adapter)
I have running asteriskwin32 on the same interface but another port.
User agent uses one UDP transport bound to 192.168.0.1 interface.

When resip uses determineSourceInterfaceWithoutIPv6 - IPhlp's GetBestRoute  
returns index of 127.0.0.1 interface. But there is no transport bound to  
this IP.

I did small workaround - check if destination interface is local before  
calling GetBestRoute. May this code be included to resiprocate?

bool WinCompat::IsLocalIf(const GenericIPAddress& addr)
{
   PMIB_IPADDRTABLE  pIpAddrTable = NULL;
   ULONG addrSize = 0;

   if (ERROR_INSUFFICIENT_BUFFER == GetIpAddrTable(NULL, &addrSize, FALSE))
     pIpAddrTable = (PMIB_IPADDRTABLE) new char [addrSize];
   else
     throw Exception("Can't load interface table", __FILE__,__LINE__);

   if (NO_ERROR == GetIpAddrTable(pIpAddrTable, &addrSize, FALSE))
   {
     // try to find a match
     DWORD i = 0;
     while (i<pIpAddrTable->dwNumEntries &&
       pIpAddrTable->table[i].dwAddr != addr.v4Address.sin_addr.S_un.S_addr)
       i++;
     bool res = i < pIpAddrTable->dwNumEntries;

     delete [] (char *) pIpAddrTable;
     return res;
   }
   return false;

}

GenericIPAddress
WinCompat::determineSourceInterfaceWithoutIPv6(const GenericIPAddress&  
destination)
{
    // check if destination is local address?
    if (IsLocalIf(destination))
      return destination;

    [skipped]
}



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