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ILRewriting for beginners

, 27 Sep 2012 Ms-PL
Runtime IL-Rewriting can be used to add behavior such as logging to applications, or redirect calls from one API to another. This article and accompanying source code explains how to substitute a method call at runtime.
ILRewriting_demo-noexe.zip
ILRewriting_demo
ILRewriting_demo.zip
ILRewriteProfiler.dll
InterceptApp.exe
InterceptLib.dll
SampleApp1.exe
ILRewriting_src.zip
ILRewriting_src
ILEmitTest
Properties
ILRewriteProfiler
exports.def
ILRewriteProfiler.vcxproj.filters
ILRewriteProfiler.vcxproj.user
InterceptApp
app.aps
app.ico
InterceptApp.vcxproj.filters
InterceptApp.vcxproj.user
InterceptLib
InterceptLib.snk
Properties
SampleApp1
Properties
SampleApp1.snk
// ----------------------------------------------------------------------------------------------
// Copyright (c) Mattias H�gstr�m.
// ----------------------------------------------------------------------------------------------
// This source code is subject to terms and conditions of the Microsoft Public License. A 
// copy of the license can be found in the License.html file at the root of this distribution. 
// If you cannot locate the Microsoft Public License, please send an email to 
// dlr@microsoft.com. By using this source code in any fashion, you are agreeing to be bound 
// by the terms of the Microsoft Public License.
// ----------------------------------------------------------------------------------------------
// You must not remove this notice, or any other, from this software.
// ----------------------------------------------------------------------------------------------

#include "Stdafx.h"

#include "ProfilerStarter.h"
#include <Windows.h>
#include <metahost.h>

#include <cor.h>
#include <corprof.h>

#include <list>
#include <string>
#include <iostream>
#include <string>
#include <sstream>
#include <tchar.h>
#include <strsafe.h>

#include "ClrHelper.h"

using namespace std;

static std::string ConvertStlString(std::wstring& text)
{    
   const std::string narrow(text.begin(), text.end());
   return narrow;
}

ProfilerStarter::ProfilerStarter()
{
   ZeroAll();
}

ProfilerStarter::~ProfilerStarter()
{
   ReleaseAll();
}

void ProfilerStarter::ReleaseAll()
{
   if (m_metahost != nullptr)
      m_metahost->Release();	
   if (m_runtimeInfo != nullptr)
      m_runtimeInfo->Release();
   if (m_clrProfiling != nullptr)
      m_clrProfiling->Release();
   ZeroAll();
}

void ProfilerStarter::ZeroAll()
{
   m_metahost = nullptr;
   m_clrProfiling = nullptr;
   m_runtimeInfo = nullptr;
   m_isAttached = false;
   m_processId = 0;
}	

HRESULT ProfilerStarter::Initialize()
{
   std::wstring version;
   if (!ClrHelper::GetV4RunTime(version))
      return E_FAIL;

   HRESULT hr = S_OK;
   do
   {
      hr = CLRCreateInstance(CLSID_CLRMetaHost, IID_ICLRMetaHost, (LPVOID*)&m_metahost);
      if (hr != S_OK) break;
      hr = m_metahost->GetRuntime(version.c_str(), IID_ICLRRuntimeInfo, (LPVOID*)&m_runtimeInfo);
      if (hr != S_OK) break;
      hr = m_runtimeInfo->GetInterface(CLSID_CLRProfiling, IID_ICLRProfiling, (LPVOID *)&m_clrProfiling);
      if (hr != S_OK) break;
      return S_OK;
   } while (false);

   // We end up here only if we have errors
   ReleaseAll();
   return hr;
}	

DWORD ProfilerStarter::GetProcessId()
{
   return m_processId;
}

BOOL ProfilerStarter::StartProcess(const WCHAR* exePath)
{
   return StartProcess(exePath, NULL);
}

BOOL ProfilerStarter::StartProcess(const WCHAR* exePath, std::list<std::wstring>& environmentVars)
{	
   std::wstring envString;
   WCHAR separator[] = L"\0";
   for(std::list<std::wstring>::iterator iter = environmentVars.begin();iter != environmentVars.end();iter++)
   {
      std::wstring envText = *iter;
      envString += envText + std::wstring(separator, 1);
   }
   envString += std::wstring(separator, 1);
   WCHAR* envPtrTemp = const_cast<WCHAR*>(envString.c_str());
   LPVOID envPtr = reinterpret_cast<LPVOID>(envPtrTemp);
   return this->StartProcess(exePath, envPtr);
}

BOOL ProfilerStarter::StartProcess(const WCHAR* exePath, LPVOID environmentVars)
{

   STARTUPINFO si;
   PROCESS_INFORMATION pi;
   ZeroMemory( &si, sizeof(si) );
   si.cb = sizeof(si);
   ZeroMemory( &pi, sizeof(pi) );
   BOOL created = ::CreateProcessW(NULL // Application Name
      , const_cast<LPWSTR>(exePath) // CommandLine
      , NULL // Process Attributes
      , NULL // Thread Attributes
      , FALSE // Inherit Handles
      , CREATE_NEW_CONSOLE | CREATE_UNICODE_ENVIRONMENT // Creation Flags
      , environmentVars // Environment
      , NULL // Current Directory
      , &si // Startup info
      , &pi);

   if (!created)
      return FALSE;
   m_processId = pi.dwProcessId;
   return m_processId != 0;
}

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License

This article, along with any associated source code and files, is licensed under The Microsoft Public License (Ms-PL)

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About the Author

Mattias Högström
Architect Visma Software AB
Sweden Sweden
Mattias works at Visma, a leading Nordic ERP solution provider. He has good knowledge in C++/.Net development, test tool development, and debugging. His great passion is memory dump analysis. He likes giving talks and courses.
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