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the Args parameter would contain
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Because our goal is to be able to read memory at the specified address, we cannot accept this parameter to be of type PCSTR (string pointer); rather, we would ideally want this value to be converted into a pointer that we can pass to the memory access API(s) The API that allows us to achieve this is the GetExpression API, which is declared as
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ULONG_PTR GetExpression ( PCSTR expression )
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When called, the GetExpression API takes the parameter passed in and tries to evaluate the parameter into a ULONG_PTR If the evaluation succeeds, the API returns a ULONG_PTR The pointer can then be used when calling memory access API(s) If the API fails, null is returned The dumptree implementations usage of GetExpression is shown below
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HRESULT CALLBACK dumptree(PDEBUG_CLIENT pClient, PCSTR szArgs) { HRESULT hRes=S_OK; ULONG_PTR pAddress=(ULONG_PTR) GetExpression(szArgs); if(!pAddress) { dprintf( Invalid head pointer address specified: %s\n , szArgs); return E_FAIL; } InOrderTraversal(pAddress); return hRes; }
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The preceding code is pretty straightforward We simply pass the szArgs parameter to the GetExpression API If the return value is non-null, we continue; otherwise, we print out a message to the debug console window stating that an invalid address was specified and returned an error Now that we have extracted and verified the address specified as part of our dumptree command, we can proceed by calling the helper function InOrderTraversal, which performs the bulk of the work when traversing and displaying the tree node information The InOrderTraversal function recursively traverses the tree and prints out tree node information by using a helper function called GetNodeValues GetNodeValues performs the interesting work of actually reading the memory contents associated with a tree node The implementation of GetNodeValues is shown here
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HRESULT GetNodeValues(ULONG64 pNode, ULONG* pulData, ULONG* pulLeft, ULONG* pulRight) { if(FAILED(hRes=pDataSpaces->ReadVirtual((ULONG_PTR) pNode+ulDataOffset, pulData,
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sizeof(ULONG), NULL))) { dprintf( Failed to read memory at address: 0x%X\n , pNode+ulDataOffset); return E_FAIL; } if(FAILED(hRes=pDataSpaces->ReadVirtual((ULONG_PTR) pNode+ulLeftOffset, pulLeft, sizeof(ULONG), NULL))) { dprintf( Failed to read memory at address: 0x%X\n , pNode+ulLeftOffset); return E_FAIL; }
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if(FAILED(hRes=pDataSpaces->ReadVirtual((ULONG_PTR) pNode+ulRightOffset, pulRight, sizeof(ULONG), NULL))) { dprintf( Failed to read memory at address: 0x%X\n , pNode+ulRightOffset); return E_FAIL; } return S_OK; }
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At a high level, the function reads in the memory associated with each of the data members by using the IDataSpaces::ReadVirtual API Please note that we are using the offsets previously initialized to get the correct data members The ReadVirtual API is defined as follows It enables reading memory from the debugger targets virtual address space:
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HRESULT IDataSpaces::ReadVirtual ( IN ULONG64 Offset, OUT PVOID Buffer, IN ULONG BufferSize, OUT OPTIONAL PULONG BytesRead ) ;
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The Offset parameter is the address we want to read from, the Buffer parameter contains the read data upon a successful read, the BufferSize parameter indicates the size of the data buffer we passed in, and BytesRead, upon completion, contains the actual number of bytes read by the API If the function is successful, S_OK is returned The final helper function in our extension is PrintNode, which simply prints out the data the left child pointer and right child pointer members of the tree node You can now use the extension to dump trees of arbitrary size in a very simple and convenient fashion Let s try it out Run the bstreeexe application under the debugger and set the breakpoint at the Traverse function Get the head pointer (as shown previously) and invoke the dumptree command:
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0:000> load C:\AWDBIN\WinXPx86chk\sysextsdll 0:000> dv this = 0x00262c20 0:000> dt this Local var @ 0x6ff1c Type CBinaryTree* 0x00262c20 +0x000 m_pHead : 0x00262c40 +0x004 m_dwDepth : 3 +0x008 m_dwNumNodes : 5 0:000> !sysextsdumptree 0x00262c40 ** Node ** Data: 5 Left child pointer: 0x0 Right child pointer: 0x262cb8 ** Node ** Data: 7 Left child pointer: 0x0 Right child pointer: 0x0 ** Node ** Data: 10 Left child pointer: 0x262c68 Right child pointer: 0x262c90 ** Node ** Data: 13 Left child pointer: 0x0 Right child pointer: 0x0 ** Node ** Data: 15 Left child pointer: 0x262ce0