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/*
* Win32 EntropySource
* (C) 1999-2009 Jack Lloyd
*
* Distributed under the terms of the Botan license
*/
#include <botan/internal/es_win32.h>
#include <windows.h>
#include <tlhelp32.h>
namespace Botan {
/**
* Win32 poll using stats functions including Tooltip32
*/
void Win32_EntropySource::poll(Entropy_Accumulator& accum)
{
/*
First query a bunch of basic statistical stuff, though
don't count it for much in terms of contributed entropy.
*/
accum.add(GetTickCount(), 0);
accum.add(GetMessagePos(), 0);
accum.add(GetMessageTime(), 0);
accum.add(GetInputState(), 0);
accum.add(GetCurrentProcessId(), 0);
accum.add(GetCurrentThreadId(), 0);
SYSTEM_INFO sys_info;
GetSystemInfo(&sys_info);
accum.add(sys_info, 1);
MEMORYSTATUS mem_info;
GlobalMemoryStatus(&mem_info);
accum.add(mem_info, 1);
POINT point;
GetCursorPos(&point);
accum.add(point, 1);
GetCaretPos(&point);
accum.add(point, 1);
LARGE_INTEGER perf_counter;
QueryPerformanceCounter(&perf_counter);
accum.add(perf_counter, 0);
/*
Now use the Tooltip library to iterate throug various objects on
the system, including processes, threads, and heap objects.
*/
HANDLE snapshot = CreateToolhelp32Snapshot(TH32CS_SNAPALL, 0);
#define TOOLHELP32_ITER(DATA_TYPE, FUNC_FIRST, FUNC_NEXT) \
if(!accum.polling_goal_achieved()) \
{ \
DATA_TYPE info; \
info.dwSize = sizeof(DATA_TYPE); \
if(FUNC_FIRST(snapshot, &info)) \
{ \
do \
{ \
accum.add(info, 1); \
} while(FUNC_NEXT(snapshot, &info)); \
} \
}
TOOLHELP32_ITER(MODULEENTRY32, Module32First, Module32Next);
TOOLHELP32_ITER(PROCESSENTRY32, Process32First, Process32Next);
TOOLHELP32_ITER(THREADENTRY32, Thread32First, Thread32Next);
#undef TOOLHELP32_ITER
if(!accum.polling_goal_achieved())
{
size_t heap_lists_found = 0;
HEAPLIST32 heap_list;
heap_list.dwSize = sizeof(HEAPLIST32);
const size_t HEAP_LISTS_MAX = 32;
const size_t HEAP_OBJS_PER_LIST = 128;
if(Heap32ListFirst(snapshot, &heap_list))
{
do
{
accum.add(heap_list, 1);
if(++heap_lists_found > HEAP_LISTS_MAX)
break;
size_t heap_objs_found = 0;
HEAPENTRY32 heap_entry;
heap_entry.dwSize = sizeof(HEAPENTRY32);
if(Heap32First(&heap_entry, heap_list.th32ProcessID,
heap_list.th32HeapID))
{
do
{
if(heap_objs_found++ > HEAP_OBJS_PER_LIST)
break;
accum.add(heap_entry, 1);
} while(Heap32Next(&heap_entry));
}
if(accum.polling_goal_achieved())
break;
} while(Heap32ListNext(snapshot, &heap_list));
}
}
CloseHandle(snapshot);
}
}
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