Composing the SPNs for a Service with an SCP

The following code example composes an SPN for a service that uses a service connection point (SCP). The returned SPN has the following format.

ServiceClass/host/ServiceName

where ServiceClass and ServiceName correspond to the pszDNofSCP and pszServiceClass parameters. In this example, host defaults to the DNS name of the local computer.

DWORD
SpnCompose(
	TCHAR ***pspn, 	// Output: an array of SPNs
	unsigned long *pulSpn,  // Output: the number of SPNs returned
	TCHAR *pszDNofSCP, // Input: DN of the service's SCP
	TCHAR* pszServiceClass) // Input: the name of the service class
{
DWORD   dwStatus; 
 
dwStatus = DsGetSpn(
	DS_SPN_SERVICE,   // Type of SPN to create (enumerated type)
	pszServiceClass,  // Service class - a name in this case
	pszDNofSCP,  // Service name - DN of the service SCP
	0, 			// Default: omit port component of SPN
	0, 			// Number of entries in hostnames and ports arrays
	NULL, 		 // Array of hostnames. Default is local computer
	NULL, 		 // Array of ports. Default omits port component
	pulSpn, 	 // Receives number of SPNs returned in array
	pspn			// Receives array of SPN(s)
	);
 
return dwStatus;
}