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#include "Patcher.h"
void Patcher::PatchBytes(BYTE* address, BYTE* shellcode, const int shellCodeSize, bool modifyPageProtection, DWORD newPageProtection, bool restorePageProtection)
{
DWORD oldProtection;
if (modifyPageProtection)
{
//apply new page protection
VirtualProtect(address, shellCodeSize, newPageProtection, &oldProtection);
}
else
{
//there is nothing to restore if page protection wasn't changed
restorePageProtection = false;
}
//apply patch
memcpy(address, shellcode, shellCodeSize);
if (restorePageProtection)
{
//restore page protection
VirtualProtect(address, shellCodeSize, oldProtection, &oldProtection);
}
}
void Patcher::NOPBytes(BYTE* address, const int amount, bool modifyPageProtection, DWORD newPageProtection, bool restorePageProtection)
{
DWORD oldProtection;
if (modifyPageProtection)
{
//apply new page protection
VirtualProtect(address, amount, newPageProtection, &oldProtection);
}
else
{
//there is nothing to restore if page protection wasn't changed
restorePageProtection = false;
}
//apply patch
for (int i = 0; i < amount; i++)
{
address[i] = 0x90; //NOP
}
if (restorePageProtection)
{
//restore page protection
VirtualProtect(address, amount, oldProtection, &oldProtection);
}
}
//Writes a 1 byte value using local endianess
void Patcher::Patch(BYTE* address, int8_t value)
{
DWORD oldProtection;
//apply new page protection
VirtualProtect(address, sizeof(value), PAGE_EXECUTE_READWRITE, &oldProtection);
//write value
*(int8_t*)address = value;
//restore page protection
VirtualProtect(address, sizeof(value), oldProtection, &oldProtection);
}
//Writes a 2 byte value using local endianess
void Patcher::Patch(BYTE* address, int16_t value)
{
DWORD oldProtection;
//apply new page protection
VirtualProtect(address, sizeof(value), PAGE_EXECUTE_READWRITE, &oldProtection);
//write value
*(int16_t*)address = value;
//restore page protection
VirtualProtect(address, sizeof(value), oldProtection, &oldProtection);
}
//Writes a 4 byte value using local endianess
void Patcher::Patch(BYTE* address, int32_t value)
{
DWORD oldProtection;
//apply new page protection
VirtualProtect(address, sizeof(value), PAGE_EXECUTE_READWRITE, &oldProtection);
//write value
*(int32_t*)address = value;
//restore page protection
VirtualProtect(address, sizeof(value), oldProtection, &oldProtection);
}
//Writes a 8 byte value using local endianess
void Patcher::Patch(BYTE* address, int64_t value)
{
DWORD oldProtection;
//apply new page protection
VirtualProtect(address, sizeof(value), PAGE_EXECUTE_READWRITE, &oldProtection);
//write value
*(int64_t*)address = value;
//restore page protection
VirtualProtect(address, sizeof(value), oldProtection, &oldProtection);
}
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