179 lines
4.3 KiB
C++
179 lines
4.3 KiB
C++
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/////////////////////////////////////////////////////////////////////////////
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//
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// Copyright (c) 2000 Microsoft Corporation
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//
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// Module Name:
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// GetComputerName.cpp
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//
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// Description:
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// Getting and setting the computer name.
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//
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// Maintained By:
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// Galen Barbee (GalenB) 31-MAR-2000
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//
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// Revision History:
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//
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// Notes:
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//
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/////////////////////////////////////////////////////////////////////////////
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#include "pch.h"
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/////////////////////////////////////////////////////////////////////////////
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//++
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//
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// HrGetComputerName()
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//
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// Description:
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// Get name of the computer on which this object is present.
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//
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// Arguments:
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// None.
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//
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// Return Value:
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// S_OK
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// Success.
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//
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// Remarks:
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// None.
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//
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//--
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//////////////////////////////////////////////////////////////////////////////
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HRESULT
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WINAPI
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HrGetComputerName(
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COMPUTER_NAME_FORMAT cnfIn,
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BSTR * pbstrComputerNameOut
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)
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{
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TraceFunc( "" );
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HRESULT hr = S_OK;
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PWCHAR pszCompName = NULL;
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DWORD cchCompName = 0;
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DWORD sc;
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DWORD dwErr;
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BOOL fAppendDomain = FALSE;
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PDOMAIN_CONTROLLER_INFO pdci = NULL;
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int idx;
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if ( pbstrComputerNameOut == NULL )
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{
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hr = THR( E_POINTER );
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goto CleanUp;
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} // if:
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//
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// DsGetDcName will give us access to a usable domain name, regardless of whether we are
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// currently in a W2k or a NT4 domain. On W2k and above, it will return a DNS domain name,
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// on NT4 it will return a NetBIOS name.
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//
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dwErr = TW32( DsGetDcName(
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NULL
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, NULL
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, NULL
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, NULL
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, DS_DIRECTORY_SERVICE_PREFERRED
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, &pdci
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) );
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if ( dwErr != ERROR_SUCCESS )
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{
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goto CleanUp;
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} // if: DsGetDcName failed
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//
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// This handles the case when we are a member of a legacy (pre-W2k) Domain.
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// In this case, both FQDN and DnsDomain will not receive useful data from GetComputerNameEx.
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// What we actually want to get is <computername>.<DomainName> in every case
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//
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switch( cnfIn )
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{
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case ComputerNameDnsFullyQualified:
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fAppendDomain = TRUE;
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cnfIn = ComputerNameDnsHostname;
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break;
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case ComputerNamePhysicalDnsFullyQualified:
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fAppendDomain = TRUE;
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cnfIn = ComputerNamePhysicalDnsHostname;
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break;
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case ComputerNameDnsDomain:
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case ComputerNamePhysicalDnsDomain:
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*pbstrComputerNameOut = TraceSysAllocString( pdci->DomainName );
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if ( *pbstrComputerNameOut == NULL )
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{
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goto OutOfMemory;
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} // if:
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goto CleanUp;
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}
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pszCompName = NULL;
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for ( idx = 0; ; idx++ )
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{
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Assert( idx < 2 );
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if ( !GetComputerNameEx( cnfIn, pszCompName, &cchCompName ) )
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{
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sc = GetLastError();
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if ( sc == ERROR_MORE_DATA )
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{
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if ( fAppendDomain )
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{
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cchCompName += (DWORD)( wcslen( pdci->DomainName ) + 1 );
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} // if:
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pszCompName = new WCHAR[ cchCompName ];
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if ( pszCompName == NULL )
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{
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goto OutOfMemory;
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} // if: new failed
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continue;
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} // if: more data...
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TW32( sc );
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hr = HRESULT_FROM_WIN32( sc );
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LogMsg( "GetComputerNameEx failed. hr = 0x%08x", hr );
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goto CleanUp;
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} // if: GetComputerNameEx() failed
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if ( fAppendDomain )
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{
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wcscat( pszCompName, L"." );
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wcscat( pszCompName, pdci->DomainName );
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}
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*pbstrComputerNameOut = TraceSysAllocString( pszCompName );
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if ( *pbstrComputerNameOut == NULL )
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{
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goto OutOfMemory;
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} // if:
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hr = S_OK;
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break;
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} // for: loop to retry the operation.
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goto CleanUp;
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OutOfMemory:
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hr = THR( E_OUTOFMEMORY );
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LogMsg( "HrGetComputerName: out of memory." );
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CleanUp:
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delete [] pszCompName;
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if ( pdci != NULL )
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{
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NetApiBufferFree( pdci );
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}
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HRETURN( hr );
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} //*** HrGetComputerName()
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