You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
714 lines
20 KiB
714 lines
20 KiB
// Tranx.cpp: implementation of the transaction support
|
|
//
|
|
// Copyright (c)1997-2001 Microsoft Corporation
|
|
//
|
|
//////////////////////////////////////////////////////////////////////
|
|
|
|
#include "Tranx.h"
|
|
#include "persistmgr.h"
|
|
#include "requestobject.h"
|
|
|
|
//
|
|
// this is a file scope global constant, representing the string length needed for a guid
|
|
// Our string guid is in this form as what StringFromGUID2 returns (includint braces):
|
|
// {ab1ff71d-fff7-4162-818f-13d6e30c3110}
|
|
|
|
const DWORD GUID_STRING_LENGTH = 39;
|
|
|
|
/*
|
|
Routine Description:
|
|
|
|
Name:
|
|
|
|
CTranxID::CTranxID
|
|
|
|
Functionality:
|
|
|
|
This is the constructor. Pass along the parameters to the base class
|
|
|
|
Virtual:
|
|
|
|
No (you know that, constructor won't be virtual!)
|
|
|
|
Arguments:
|
|
|
|
pKeyChain - Pointer to the ISceKeyChain COM interface which is prepared
|
|
by the caller who constructs this instance.
|
|
|
|
pNamespace - Pointer to WMI namespace of our provider (COM interface).
|
|
Passed along by the caller. Must not be NULL.
|
|
|
|
pCtx - Pointer to WMI context object (COM interface). Passed along
|
|
by the caller. It's up to WMI whether this interface pointer is NULL or not.
|
|
|
|
Return Value:
|
|
|
|
None as any constructor
|
|
|
|
Notes:
|
|
if you create any local members, think about initialize them here
|
|
|
|
*/
|
|
|
|
CTranxID::CTranxID (
|
|
IN ISceKeyChain * pKeyChain,
|
|
IN IWbemServices * pNamespace,
|
|
IN IWbemContext * pCtx
|
|
)
|
|
:
|
|
CGenericClass(pKeyChain, pNamespace, pCtx)
|
|
{
|
|
}
|
|
|
|
/*
|
|
Routine Description:
|
|
|
|
Name:
|
|
|
|
CTranxID::~CTranxID
|
|
|
|
Functionality:
|
|
|
|
Destructor. Necessary as good C++ discipline since we have virtual functions.
|
|
|
|
Virtual:
|
|
|
|
Yes.
|
|
|
|
Arguments:
|
|
|
|
none as any destructor
|
|
|
|
Return Value:
|
|
|
|
None as any destructor
|
|
|
|
Notes:
|
|
if you create any local members, think about whether
|
|
there is any need for a non-trivial destructor
|
|
|
|
*/
|
|
CTranxID::~CTranxID ()
|
|
{
|
|
}
|
|
|
|
/*
|
|
Routine Description:
|
|
|
|
Name:
|
|
|
|
CTranxID::PutInst
|
|
|
|
Functionality:
|
|
|
|
Put an instance as instructed by WMI. Since this class implements
|
|
Sce_TransactionID, which is persistence oriented, this will cause
|
|
the Sce_TransactionID object's property information to be saved
|
|
in our store.
|
|
|
|
Virtual:
|
|
|
|
Yes.
|
|
|
|
Arguments:
|
|
|
|
pInst - COM interface pointer to the WMI class (Sce_TransactionID) object.
|
|
|
|
pHandler - COM interface pointer for notifying WMI of any events.
|
|
|
|
pCtx - COM interface pointer. This interface is just something we pass around.
|
|
WMI may mandate it (not now) in the future. But we never construct
|
|
such an interface and so, we just pass around for various WMI API's
|
|
|
|
Return Value:
|
|
|
|
Success: it must return success code (use SUCCEEDED to test). It is
|
|
not guaranteed to return WBEM_NO_ERROR.
|
|
|
|
Failure: Various errors may occurs. Any such error should indicate the failure of persisting
|
|
the instance.
|
|
|
|
Notes:
|
|
|
|
*/
|
|
HRESULT
|
|
CTranxID::PutInst (
|
|
IN IWbemClassObject * pInst,
|
|
IN IWbemObjectSink * pHandler,
|
|
IN IWbemContext * pCtx
|
|
)
|
|
{
|
|
//
|
|
// CScePropertyMgr helps us to access WMI object's properties
|
|
// create an instance and attach the WMI object to it.
|
|
// This will always succeed.
|
|
//
|
|
|
|
CScePropertyMgr ScePropMgr;
|
|
ScePropMgr.Attach(pInst);
|
|
|
|
//
|
|
// need to get the storepath property from the WMI object
|
|
//
|
|
|
|
CComBSTR vbstrStorePath;
|
|
HRESULT hr = ScePropMgr.GetProperty(pStorePath, &vbstrStorePath);
|
|
//
|
|
// if storepath is missing, we can't continue because we don't know where to store the info
|
|
//
|
|
|
|
if (SUCCEEDED(hr))
|
|
{
|
|
//
|
|
// get the transaction guid (we actually use string)
|
|
//
|
|
CComBSTR bstrToken;
|
|
hr = ScePropMgr.GetProperty(pTranxGuid, &bstrToken);
|
|
|
|
//
|
|
// we will allow the object not to have a guid. In that case, we will create one ourselves
|
|
//
|
|
|
|
if (FAILED(hr) || WBEM_S_RESET_TO_DEFAULT == hr)
|
|
{
|
|
GUID guid = GUID_NULL;
|
|
hr = ::CoCreateGuid(&guid);
|
|
|
|
if (SUCCEEDED(hr))
|
|
{
|
|
//
|
|
// allocate buffer for the guid's string representation
|
|
// warning: don't blindly free this memory, it will be done by CComBSTR automatically!
|
|
//
|
|
bstrToken.m_str = ::SysAllocStringLen(NULL, GUID_STRING_LENGTH);
|
|
if (bstrToken.m_str == NULL)
|
|
{
|
|
hr = WBEM_E_OUT_OF_MEMORY;
|
|
}
|
|
else
|
|
{
|
|
//
|
|
// the only possibility for failure is that our buffer is too small
|
|
// which should not happen!
|
|
//
|
|
if (::StringFromGUID2(guid, bstrToken.m_str, GUID_STRING_LENGTH) == 0)
|
|
{
|
|
hr = WBEM_E_BUFFER_TOO_SMALL;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
//
|
|
// ready to save if everything is fine
|
|
//
|
|
|
|
if (SUCCEEDED(hr))
|
|
{
|
|
//
|
|
// this store will be responsible for persisting the instance
|
|
//
|
|
|
|
CSceStore SceStore;
|
|
|
|
//
|
|
// the persistence is for having a storepath and on behalf of the instance
|
|
//
|
|
|
|
SceStore.SetPersistProperties(pInst, pStorePath);
|
|
|
|
//
|
|
// write the template header for inf files. For databases, this is a no-op
|
|
//
|
|
DWORD dwDump;
|
|
hr = SceStore.WriteSecurityProfileInfo(AreaBogus, (PSCE_PROFILE_INFO)&dwDump, NULL, false);
|
|
|
|
//
|
|
// also, we need to write it to attachment section because it's not a native core object
|
|
// without an entry in the attachment section, inf file tempalte can't be imported to
|
|
// database stores. For database store, this is no-op
|
|
//
|
|
|
|
if (SUCCEEDED(hr))
|
|
{
|
|
hr = SceStore.WriteAttachmentSection(SCEWMI_TRANSACTION_ID_CLASS, pszAttachSectionValue);
|
|
}
|
|
|
|
//
|
|
// Save all the properties
|
|
//
|
|
if (SUCCEEDED(hr))
|
|
{
|
|
hr = SceStore.SavePropertyToStore(SCEWMI_TRANSACTION_ID_CLASS, pTranxGuid, (LPCWSTR)bstrToken);
|
|
}
|
|
}
|
|
}
|
|
|
|
return hr;
|
|
}
|
|
|
|
/*
|
|
Routine Description:
|
|
|
|
Name:
|
|
|
|
CTranxID::CreateObject
|
|
|
|
Functionality:
|
|
|
|
Create WMI objects (Sce_TransactionID). Depending on parameter atAction,
|
|
this creation may mean:
|
|
(a) Get a single instance (atAction == ACTIONTYPE_GET)
|
|
(b) Get several instances satisfying some criteria (atAction == ACTIONTYPE_QUERY)
|
|
(c) Delete an instance (atAction == ACTIONTYPE_DELETE)
|
|
|
|
Virtual:
|
|
|
|
Yes.
|
|
|
|
Arguments:
|
|
|
|
pHandler - COM interface pointer for notifying WMI for creation result.
|
|
atAction - Get single instance ACTIONTYPE_GET
|
|
Get several instances ACTIONTYPE_QUERY
|
|
Delete a single instance ACTIONTYPE_DELETE
|
|
|
|
Return Value:
|
|
|
|
Success: it must return success code (use SUCCEEDED to test). It is
|
|
not guaranteed to return WBEM_NO_ERROR. The returned objects are indicated to WMI,
|
|
not directly passed back via parameters.
|
|
|
|
Failure: Various errors may occurs. Except WBEM_E_NOT_FOUND, any such error should indicate
|
|
the failure of getting the wanted instance. If WBEM_E_NOT_FOUND is returned in querying
|
|
situations, this may not be an error depending on caller's intention.
|
|
|
|
Notes:
|
|
|
|
*/
|
|
|
|
HRESULT
|
|
CTranxID::CreateObject (
|
|
IN IWbemObjectSink * pHandler,
|
|
IN ACTIONTYPE atAction
|
|
)
|
|
{
|
|
//
|
|
// we know how to:
|
|
// Get single instance ACTIONTYPE_GET
|
|
// Delete a single instance ACTIONTYPE_DELETE
|
|
// Get several instances ACTIONTYPE_QUERY
|
|
//
|
|
|
|
if ( ACTIONTYPE_GET != atAction &&
|
|
ACTIONTYPE_DELETE != atAction &&
|
|
ACTIONTYPE_QUERY != atAction )
|
|
{
|
|
return WBEM_E_NOT_SUPPORTED;
|
|
}
|
|
|
|
//
|
|
// need to know where to look for the instance(s), i.e., the store path!
|
|
//
|
|
CComVariant varStorePath;
|
|
|
|
HRESULT hr = m_srpKeyChain->GetKeyPropertyValue(pStorePath, &varStorePath);
|
|
|
|
//
|
|
// GetKeyPropertyValue returns WBEM_S_FALSE if the key is not recognized.
|
|
// WMI may return success code with empty variant. So, we won't proceed
|
|
// unless we know that we get a bstr
|
|
//
|
|
|
|
if (SUCCEEDED(hr) && hr != WBEM_S_FALSE && varStorePath.vt == VT_BSTR)
|
|
{
|
|
//
|
|
// our store knows needs to know where to read instances.
|
|
// If this fails, it doesn't make sense to continue.
|
|
//
|
|
|
|
CSceStore SceStore;
|
|
hr = SceStore.SetPersistPath(varStorePath.bstrVal);
|
|
|
|
if ( SUCCEEDED(hr) )
|
|
{
|
|
//
|
|
// make sure the store (just a file) really exists. The raw path
|
|
// may contain env variables, so we need the expanded path
|
|
//
|
|
|
|
DWORD dwAttrib = GetFileAttributes(SceStore.GetExpandedPath());
|
|
|
|
if ( dwAttrib == -1 )
|
|
{
|
|
//
|
|
// if store is not there, we indicate that the instance can't be found
|
|
//
|
|
hr = WBEM_E_NOT_FOUND;
|
|
}
|
|
else
|
|
{
|
|
if ( ACTIONTYPE_DELETE == atAction )
|
|
{
|
|
//
|
|
// since we will only ever have one instance,
|
|
// deleting the one means to remove the entire section
|
|
//
|
|
|
|
hr = SceStore.DeleteSectionFromStore(SCEWMI_TRANSACTION_ID_CLASS);
|
|
}
|
|
else
|
|
{
|
|
//
|
|
// Will hold the transation ID.
|
|
// Warning! Need to free this memory! So, don't blindly return!
|
|
//
|
|
|
|
LPWSTR pszTranxID = NULL;
|
|
|
|
DWORD dwRead = 0;
|
|
hr = SceStore.GetPropertyFromStore(SCEWMI_TRANSACTION_ID_CLASS, pTranxGuid, &pszTranxID, &dwRead);
|
|
|
|
//
|
|
// If successful, then fill in the tranx guid and store path properties.
|
|
// If transaction id can't be found, the object will be useless. So, should abort.
|
|
//
|
|
|
|
if (SUCCEEDED(hr))
|
|
{
|
|
//
|
|
// get from WMI a blank instance. See function definition for details.
|
|
// Smart pointer srpObj will automatically release interface pointer.
|
|
//
|
|
|
|
CComPtr<IWbemClassObject> srpObj;
|
|
hr = SpawnAnInstance(&srpObj);
|
|
|
|
if (SUCCEEDED(hr))
|
|
{
|
|
//
|
|
// use property manager to put the properties for this instance srpObj,
|
|
// Attach will always succeed.
|
|
//
|
|
|
|
CScePropertyMgr ScePropMgr;
|
|
ScePropMgr.Attach(srpObj);
|
|
|
|
//
|
|
// we have two properties to put: pStorePath, and pTranxGuid
|
|
//
|
|
|
|
hr = ScePropMgr.PutProperty(pStorePath, SceStore.GetExpandedPath());
|
|
if (SUCCEEDED(hr))
|
|
{
|
|
hr = ScePropMgr.PutProperty(pTranxGuid, pszTranxID);
|
|
}
|
|
|
|
//
|
|
// everything alright, pass to WMI the newly created instance!
|
|
//
|
|
|
|
if (SUCCEEDED(hr))
|
|
{
|
|
hr = pHandler->Indicate(1, &srpObj);
|
|
}
|
|
}
|
|
}
|
|
|
|
//
|
|
// we promise to release this memory
|
|
//
|
|
|
|
delete [] pszTranxID;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
if (SUCCEEDED(hr))
|
|
{
|
|
//
|
|
// do the necessary gestures to WMI.
|
|
// the use of WBEM_STATUS_REQUIREMENTS in SetStatus is not documented by WMI
|
|
// at this point. Consult WMI team for detail if you suspect problems with
|
|
// the use of WBEM_STATUS_REQUIREMENTS
|
|
//
|
|
|
|
if ( ACTIONTYPE_QUERY == atAction )
|
|
{
|
|
pHandler->SetStatus(WBEM_STATUS_REQUIREMENTS, S_FALSE, NULL, NULL);
|
|
}
|
|
else if (ACTIONTYPE_GET == atAction)
|
|
{
|
|
pHandler->SetStatus(WBEM_STATUS_REQUIREMENTS, S_OK, NULL, NULL);
|
|
}
|
|
}
|
|
|
|
return hr;
|
|
}
|
|
|
|
/*
|
|
Routine Description:
|
|
|
|
Name:
|
|
|
|
static CTranxID::BeginTransaction
|
|
|
|
Functionality:
|
|
|
|
Given a store path (file to the template), this function will start a transaction
|
|
by creating our transaction token (an ID).
|
|
|
|
Virtual:
|
|
|
|
no.
|
|
|
|
Arguments:
|
|
|
|
pszStorePath - 0 terminated string as the tempalte file's path
|
|
|
|
Return Value:
|
|
|
|
Success: it must return success code (use SUCCEEDED to test). It is
|
|
not guaranteed to return WBEM_NO_ERROR.
|
|
|
|
Failure: Various errors may occurs. Except WBEM_E_NOT_AVAILABLE, any such error should indicate
|
|
the serious failure. WBEM_E_NOT_AVAILABLE is used to indicate that this template does
|
|
not have any transaction related information, and therefore the template won't be able
|
|
to have its own transaction context. This may or may not be an error
|
|
|
|
Notes:
|
|
Our transction token (Sce_TransactionToken) is not persisted. Our provider provides that
|
|
instance on bases of the validility of our global BSTR varialbe g_bstrTranxID. Due to
|
|
the global nature of g_bstrTranxID, its access should be protected from different threads.
|
|
For that purpose, we use a global critical section g_CS, which is an instance of
|
|
CCriticalSection. CCriticalSection is a very simple wrapper of CRITICAL_SECTION to simply
|
|
its creation/destruction time.
|
|
|
|
*/
|
|
HRESULT
|
|
CTranxID::BeginTransaction (
|
|
IN LPCWSTR pszStorePath
|
|
)
|
|
{
|
|
//
|
|
// we don't allow NULL path or zero length path
|
|
//
|
|
|
|
if (pszStorePath == NULL || *pszStorePath == L'\0')
|
|
return WBEM_E_INVALID_PARAMETER;
|
|
|
|
//
|
|
// Inform the store that all its reading action will take place inside this template
|
|
//
|
|
|
|
CSceStore SceStore;
|
|
HRESULT hr = SceStore.SetPersistPath(pszStorePath);
|
|
|
|
if ( SUCCEEDED(hr) )
|
|
{
|
|
//
|
|
// make sure that the template really exists!
|
|
// Since passed-in parameter of store path may contain env varaibles, we need to use its
|
|
// expanded path for file access!
|
|
//
|
|
|
|
DWORD dwAttrib = ::GetFileAttributes(SceStore.GetExpandedPath());
|
|
|
|
//
|
|
// if the file exist
|
|
//
|
|
if ( dwAttrib != -1 )
|
|
{
|
|
DWORD dwRead = 0;
|
|
|
|
//
|
|
// GetPropertyFromStore will allocate memory for the property read.
|
|
// We are responsible to free it.
|
|
//
|
|
LPWSTR pszTranxID = NULL;
|
|
|
|
//
|
|
// Read the transaction id property, dwRead will contain the bytes read from the store.
|
|
// Since we have no minimum length requirement, dwRead is ignored as long as something is read!
|
|
//
|
|
|
|
hr = SceStore.GetPropertyFromStore(SCEWMI_TRANSACTION_ID_CLASS, pTranxGuid, &pszTranxID, &dwRead);
|
|
if (SUCCEEDED(hr))
|
|
{
|
|
//
|
|
// To flag ourselves that a transaction is in place, we set our global
|
|
// varialbe b_bstrTranxID to a valid value (non-empty means valid). Since it's
|
|
// global, we need thread protection!
|
|
//
|
|
g_CS.Enter();
|
|
g_bstrTranxID.Empty();
|
|
g_bstrTranxID = pszTranxID;
|
|
g_CS.Leave();
|
|
}
|
|
delete [] pszTranxID;
|
|
}
|
|
else
|
|
{
|
|
// indicate that the store doesn't exists
|
|
hr = WBEM_E_NOT_AVAILABLE;
|
|
}
|
|
}
|
|
|
|
return hr;
|
|
}
|
|
|
|
/*
|
|
Routine Description:
|
|
|
|
Name:
|
|
|
|
static CTranxID::EndTransaction
|
|
|
|
Functionality:
|
|
|
|
Terminate the transaction. Unlike real transaction management, we don't
|
|
have a commit function because without the user initiated the rollback, we
|
|
can't do a rollback. Therefore, our "transaction" only has a begin and end
|
|
to define its range of action.
|
|
|
|
Virtual:
|
|
|
|
no.
|
|
|
|
Arguments:
|
|
|
|
none
|
|
|
|
Return Value:
|
|
|
|
WBEM_NO_ERROR
|
|
|
|
Notes:
|
|
See CTranxID::BeginTransaction
|
|
|
|
*/
|
|
HRESULT
|
|
CTranxID::EndTransaction()
|
|
{
|
|
//
|
|
// now the transaction is over, we will remove the Sce_TransactionToken instance.
|
|
// We do that by invalidating our global variable g_bstrTranxID. An empty g_bstrTranxID
|
|
// means it's invalid.
|
|
//
|
|
|
|
g_CS.Enter();
|
|
g_bstrTranxID.Empty();
|
|
g_CS.Leave();
|
|
return WBEM_NO_ERROR;
|
|
}
|
|
|
|
/*
|
|
Routine Description:
|
|
|
|
Name:
|
|
|
|
static CTranxID::SpawnTokenInstance
|
|
|
|
Functionality:
|
|
|
|
Caller gives us the transaction ID, we will make a WMI object (Sce_TransactionToken)
|
|
to the caller.
|
|
|
|
Virtual:
|
|
|
|
no.
|
|
|
|
Arguments:
|
|
|
|
pNamespace - COM interface pointer to IWbemServices. This is the namespace.
|
|
Can't be NULL.
|
|
|
|
pszTranxID - caller supplied string representing the transactio id.
|
|
|
|
pCtx - COM interface pointer to IWbemContext. Need to pass this around in
|
|
various WMI calls.
|
|
|
|
pSink - COM interface pointer to IWbemObjectSink. Used to notify WMI for newly
|
|
created instance. Must not be NULL.
|
|
|
|
Return Value:
|
|
|
|
Success: it must return success code (use SUCCEEDED to test). It is
|
|
not guaranteed to return WBEM_NO_ERROR (up to WMI)
|
|
|
|
Failure: Various errors may occurs. Any such error should indicate failure to create the
|
|
Sce_TransactionToken instance for the caller.
|
|
|
|
Notes:
|
|
Call this function with a transaction ID string will cause an instance of
|
|
Sce_TransactionToken being created.
|
|
|
|
*/
|
|
|
|
HRESULT
|
|
CTranxID::SpawnTokenInstance (
|
|
IN IWbemServices * pNamespace,
|
|
IN LPCWSTR pszTranxID,
|
|
IN IWbemContext * pCtx,
|
|
IN IWbemObjectSink * pSink
|
|
)
|
|
{
|
|
//
|
|
// minimu requirement for the parameters:
|
|
// (1) non-NULL namepsace
|
|
// (2) a valid id string (length greater than 0)
|
|
// (3) a valid sink (so that we can notify WMI)
|
|
//
|
|
|
|
if (pNamespace == NULL || pszTranxID == NULL || *pszTranxID == L'\0' || pSink == NULL)
|
|
{
|
|
return WBEM_E_INVALID_PARAMETER;
|
|
}
|
|
|
|
//
|
|
// GetObject (WMI defined) requires a BSTR. We use a CComBSTR for auto releasing of memory
|
|
//
|
|
CComBSTR bstrClassName(SCEWMI_TRANSACTION_TOKEN_CLASS);
|
|
|
|
//
|
|
// What returned from pNamespace->GetObject can't be used to fill in properties.
|
|
// It's only good for spawn a blank instance which can be used to fill in properties!
|
|
// Some weird WMI protocol!
|
|
//
|
|
CComPtr<IWbemClassObject> srpSpawnObj;
|
|
HRESULT hr = pNamespace->GetObject(bstrClassName, 0, NULL, &srpSpawnObj, NULL);
|
|
|
|
//
|
|
// This one will be good to fill in properties
|
|
//
|
|
|
|
CComPtr<IWbemClassObject> srpBlankObj;
|
|
if (SUCCEEDED(hr))
|
|
{
|
|
hr = srpSpawnObj->SpawnInstance(0, &srpBlankObj);
|
|
}
|
|
|
|
if (SUCCEEDED(hr))
|
|
{
|
|
//
|
|
// Use our property manager to fill in property for this newly spawned instance
|
|
//
|
|
|
|
CScePropertyMgr ScePropMgr;
|
|
ScePropMgr.Attach(srpBlankObj);
|
|
hr = ScePropMgr.PutProperty(pTranxGuid, pszTranxID);
|
|
|
|
//
|
|
// we never want to hand out a Sce_TransactionToken object without
|
|
// its critical property of transaction id. So, only when we have successfully
|
|
// put in that property will we inform WMI for the object.
|
|
//
|
|
if (SUCCEEDED(hr))
|
|
{
|
|
hr = pSink->Indicate(1, &srpBlankObj);
|
|
}
|
|
}
|
|
|
|
return hr;
|
|
}
|