void CopySections(byte[] data, IMAGE_NT_HEADERS32 *ntHeader)
{
if (data == null)
{
throw new ArgumentNullException("data");
}
if (ntHeader->Signature != NativeDeclarations.IMAGE_NT_SIGNATURE)
{
throw new BadImageFormatException("Inavlid PE-Header");
}
uint size;
int *dest;
IMAGE_SECTION_HEADER *section = NativeDeclarations.IMAGE_FIRST_SECTION(this.headers);
for (int i = 0; i < this.headers->FileHeader.NumberOfSections; i++, section++)
{
if (section->SizeOfRawData == 0)
{
// section doesn't contain data in the dll itself, but may define
// uninitialized data
size = ntHeader->OptionalHeader.SectionAlignment;
if (size > 0)
{
dest = (int *)NativeDeclarations.VirtualAlloc(
new IntPtr(this.codeBase + section->VirtualAddress),
size,
AllocationType.COMMIT,
MemoryProtection.READWRITE).ToPointer();
section->PhysicalAddress = (uint)dest;
NativeDeclarations.MemSet(new IntPtr(dest), 0, new IntPtr(size));
}
continue;
}
dest = (int *)NativeDeclarations.VirtualAlloc(
new IntPtr((int)this.codeBase + section->VirtualAddress),
section->SizeOfRawData,
AllocationType.COMMIT,
MemoryProtection.READWRITE).ToPointer();
Marshal.Copy(data, (int)section->PointerToRawData, new IntPtr(dest), (int)section->SizeOfRawData);
section->PhysicalAddress = (uint)dest;
}
}
private void MemoryLoadLibrary(byte[] data)
{
IMAGE_DOS_HEADER32 *dosHeader;
IMAGE_NT_HEADERS32 *ntHeader;
IntPtr dllEntryPtr;
byte * code, headers, dataPtr;
uint locationDelta;
this.dataHandle = GCHandle.Alloc(data, GCHandleType.Pinned);
dataPtr = (byte *)this.dataHandle.AddrOfPinnedObject().ToPointer();
dosHeader = (IMAGE_DOS_HEADER32 *)dataPtr;
if (dosHeader->e_magic != NativeDeclarations.IMAGE_DOS_SIGNATURE)
{
throw new BadImageFormatException("Not a valid executable file.");
}
ntHeader = (IMAGE_NT_HEADERS32 *)(dataPtr + dosHeader->e_lfanew);
if (ntHeader->Signature != NativeDeclarations.IMAGE_NT_SIGNATURE)
{
throw new BadImageFormatException("Not a valid PE file.");
}
code = (byte *)NativeDeclarations.VirtualAlloc(
new IntPtr(ntHeader->OptionalHeader.ImageBase),
ntHeader->OptionalHeader.SizeOfImage,
AllocationType.RESERVE,
MemoryProtection.READWRITE).ToPointer();
if (code == null)
{
code = (byte *)NativeDeclarations.VirtualAlloc(
IntPtr.Zero,
ntHeader->OptionalHeader.SizeOfImage,
AllocationType.RESERVE,
MemoryProtection.READWRITE).ToPointer();
}
if (code == null)
{
throw new Win32Exception();
}
NativeDeclarations.VirtualAlloc(
new IntPtr(code),
ntHeader->OptionalHeader.SizeOfImage,
AllocationType.COMMIT,
MemoryProtection.READWRITE);
this.codeBase = code;
headers = (byte *)NativeDeclarations.VirtualAlloc(
new IntPtr(code),
ntHeader->OptionalHeader.SizeOfHeaders,
AllocationType.COMMIT,
MemoryProtection.READWRITE).ToPointer();
if (headers == null)
{
throw new Win32Exception();
}
Marshal.Copy(data, 0, new IntPtr(headers), (int)(dosHeader->e_lfanew + ntHeader->OptionalHeader.SizeOfHeaders));
this.headers = (IMAGE_NT_HEADERS32 *)&((byte *)(headers))[dosHeader->e_lfanew];
this.headers->OptionalHeader.ImageBase = (uint)code;
this.CopySections(data, ntHeader);
locationDelta = (uint)(code - ntHeader->OptionalHeader.ImageBase);
if (locationDelta != 0)
{
PerformBaseRelocation(locationDelta);
}
this.BuildImportTable();
this.FinalizeSections();
if (this.headers->OptionalHeader.AddressOfEntryPoint == 0)
{
throw new NativeDllLoadException("DLL has no entry point");
}
dllEntryPtr = new IntPtr(code + this.headers->OptionalHeader.AddressOfEntryPoint);
this.dllEntry = (DllEntryDelegate)Marshal.GetDelegateForFunctionPointer(dllEntryPtr, typeof(DllEntryDelegate));
if (dllEntry(new IntPtr(code), DllReason.DLL_PROCESS_ATTACH, IntPtr.Zero))
{
this.initialized = true;
}
else
{
this.initialized = false;
throw new NativeDllLoadException("Can't attach DLL to process.");
}
}
