68 lines
2.3 KiB
C
68 lines
2.3 KiB
C
#include "pch.h"
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#pragma hdrstop
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// External function prototypes
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FARPROC
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WINAPI
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DelayLoadFailureHook (
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LPCSTR pszDllName,
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LPCSTR pszProcName
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);
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//
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// This function is for people who statically link to dload.lib so that
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// the can get all of kernel32's dload error stubs on any os <= Whistler.
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//
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// !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
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//
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// NOTE: You should ONLY use this if you have a binary that must run on NT4, win2k, win9x, etc.
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// If your binary is whistler or greater, use DLOAD_ERROR_HANDLER=kernel32 in your
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// sources file instead.
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//
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// !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
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FARPROC
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WINAPI
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Downlevel_DelayLoadFailureHook(
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UINT unReason,
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PDelayLoadInfo pDelayInfo
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)
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{
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FARPROC ReturnValue = NULL;
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// For a failed LoadLibrary, we will return the HINSTANCE of this DLL.
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// This will cause the loader to try a GetProcAddress on our DLL for the
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// function. This will subsequently fail and then we will be called
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// for dliFailGetProc below.
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if (dliFailLoadLib == unReason)
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{
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// HACKHACK (reinerf)
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//
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// For ORDINAL delayload failures we cannot just return our base addr and be done with everything. The problem
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// is that the linker stub code will turn around and call GetProcAddress() some random ordinal which probably
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// exists and is definately NOT the correct function.
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//
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// So to get around this problem we return -1 for a the hModule, which should cause GetProcAddress(-1, ...) to
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// always fail. This is good, because the linker code will call us back for the GetProcAddress failure and we
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// can then return the stub error handler proc.
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ReturnValue = (FARPROC)-1;
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}
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else if (dliFailGetProc == unReason)
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{
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// The loader is asking us to return a pointer to a procedure.
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// Lookup the handler for this DLL/procedure and, if found, return it.
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ReturnValue = DelayLoadFailureHook(pDelayInfo->szDll, pDelayInfo->dlp.szProcName);
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if (ReturnValue)
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{
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// Do this on behalf of the handler now that it is about to
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// be called.
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SetLastError(ERROR_MOD_NOT_FOUND);
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}
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}
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return ReturnValue;
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}
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