[reSIProcate] Windows Name Resolution

[Dario Bozzali]

Hello,
I'm using SVN head of Resiprocate stack and I'm facing a problem using
Windows Name Resolution.
I defined WIN32_SYNCRONOUS_RESOLUTION_ON_ARES_FAILURE in the project, so in
DnsResult.cxx WSALookupService functions are used to resolve names:
void DnsResult::onDnsResult(const DNSResult<DnsHostRecord>& result)
{
...
#ifdef WIN32_SYNCRONOUS_RESOLUTION_ON_ARES_FAILURE
	// Try Windows Name Resolution (not asyncronous)
	WSAQUERYSET QuerySet = { 0 };
	GUID guidServiceTypeUDP = SVCID_UDP(mPort);
	GUID guidServiceTypeTCP = SVCID_TCP(mPort);
	HANDLE hQuery;
	QuerySet.dwSize = sizeof(WSAQUERYSET);
	QuerySet.lpServiceClassId = mTransport == UDP ? &guidServiceTypeUDP
: &guidServiceTypeTCP;
	QuerySet.dwNameSpace = NS_ALL;
	QuerySet.lpszServiceInstanceName = (char *)mTarget.c_str();
	if(WSALookupServiceBegin(&QuerySet, LUP_RETURN_ADDR, &hQuery) == 0)
	{
		DWORD dwQuerySize = 256;   // Starting size
		int iRet = 0;
		bool fDone = false;
		LPWSAQUERYSET pQueryResult = (LPWSAQUERYSET) new
char[dwQuerySize];
		while(iRet == 0 && pQueryResult)
		{
			iRet = WSALookupServiceNext(hQuery, 0, &dwQuerySize,
pQueryResult);
...


If mTarget is the host name (without DNS suffixes) on which my applicaton is
running, then WSALookupServiceNext() fails and WSAGetLastError is 10108.
I changed onDnsResult() method using SVCID_HOSTNAME as service class id (see
below) and in this way I'm able to resolve host names:
void DnsResult::onDnsResult(const DNSResult<DnsHostRecord>& result)
{
...
#ifdef WIN32_SYNCRONOUS_RESOLUTION_ON_ARES_FAILURE
	// Try Windows Name Resolution (not asyncronous)
	WSAQUERYSET QuerySet = { 0 };
	HANDLE hQuery;
	QuerySet.dwSize = sizeof(WSAQUERYSET);
	GUID guidServiceTypeHostName = SVCID_HOSTNAME;
	QuerySet.lpServiceClassId = &guidServiceTypeHostName;
	QuerySet.dwNameSpace = NS_ALL;
	QuerySet.lpszServiceInstanceName = (char *)mTarget.c_str();
...

What is your opinion regarding this change?
Is that correct?

Thanks and regards,
Dario.

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