132 lines
3.2 KiB
C++
132 lines
3.2 KiB
C++
//+-------------------------------------------------------------------------
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//
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// Microsoft Windows
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// Copyright (C) Microsoft Corporation, 1995
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//
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// File: dvtbl.cxx
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//
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// Contents: Ole NTSD extension routines to dump a vtbl
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//
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// Functions: displayVtbl
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//
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//
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// History: 06-01-95 BruceMa Created
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//
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//
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//--------------------------------------------------------------------------
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#include <ole2int.h>
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#include <windows.h>
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#include "ole.h"
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//+-------------------------------------------------------------------------
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//
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// Function: vtblHelp
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//
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// Synopsis: Display a menu for the command 'vt'
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//
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// Arguments: -
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//
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// Returns: -
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//
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// History: 07-Mar-95 BruceMa Created
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//
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//--------------------------------------------------------------------------
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void vtblHelp(PNTSD_EXTENSION_APIS lpExtensionApis)
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{
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Printf("vt obj - Interpret vtbl for object obj:\n");
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}
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//+-------------------------------------------------------------------------
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//
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// Function: displayVtbl
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//
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// Synopsis: Given an object interpret its vtbl
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//
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// Arguments: [hProcess] - Handle of this process
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// [lpExtensionApis] - Table of extension functions
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//
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// Returns: -
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//
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// History: 01-Jun-95 BruceMa Created
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//
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//--------------------------------------------------------------------------
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void displayVtbl(HANDLE hProcess,
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PNTSD_EXTENSION_APIS lpExtensionApis,
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void *lpObj)
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{
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DWORD lpVtbl = 0xdeaddead;
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DWORD dwVtblOffset;
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char achSymbol[256];
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// Get the address of the vtbl
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ReadMem(&lpVtbl, lpObj, sizeof(LPVOID));
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// Check for some reasonableness
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if (lpVtbl == 0 || lpVtbl == 0xdededede || lpVtbl == 0xedededed ||
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lpVtbl == 0xdeaddead)
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{
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if (lpVtbl == 0xdeaddead)
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{
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Printf("...vtbl pointer could not be read\n");
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}
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else
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{
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Printf("...vtbl pointer == 0x%x is unreasonable\n", lpVtbl);
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}
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return;
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}
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// vtbl entries should always point at functions. Therefore, we should
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// always have a displacement of zero. To check for the end of the table
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// we will reevaluate the vtbl pointer. If the offset isn't what we
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// expected, then we are done.
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DWORD dwIndex;
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for (dwIndex = 0 ; dwIndex < 512 ; dwIndex += 4, lpVtbl += 4)
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{
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DWORD dwVtblEntry;
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// Just in case the loop gets away from us
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if (CheckControlC())
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{
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return;
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}
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// Read the next vtbl entry
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ReadMem(&dwVtblEntry, lpVtbl, sizeof(dwVtblEntry));
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// If the function is at zero, then must be at end of table
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if (dwVtblEntry == 0)
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{
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return;
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}
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// Now, determine the symbol for the entry in the vtbl
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GetSymbol((LPVOID) dwVtblEntry, (UCHAR *) achSymbol, &dwVtblOffset);
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// If it doesn't point to the start of a routine, then it
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// probably isn't part of the vtbl
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if (dwVtblOffset != 0)
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{
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return;
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}
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// Print the vtbl entry symbolically
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Printf(" 0x%08x %s\n", dwVtblEntry, achSymbol);
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}
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}
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