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#include <stdafx.h>
#include "context.h"
#include <libcommon/string.h>
#include <windows.h>
#include <nsis/pluginapi.h>
#include <string>
#include <vector>
Context g_context;
namespace
{
std::wstring PopString()
{
//
// NSIS functions popstring() and popstringn() require that you definitely size the buffer
// before popping the string. Let's do it ourselves instead.
//
if (!g_stacktop || !*g_stacktop)
{
throw std::runtime_error("NSIS variable stack is corrupted");
}
stack_t *th = *g_stacktop;
std::wstring copy(th->text);
*g_stacktop = th->next;
GlobalFree((HGLOBAL)th);
return copy;
}
EXTERN_C IMAGE_DOS_HEADER __ImageBase;
void PinDll()
{
//
// Apparently NSIS loads and unloads the plugin module for EVERY call it makes to the plugin.
// This makes it kind of difficult to maintain state.
//
// We can work around this by incrementing the module reference count.
// When NSIS calls FreeLibrary() the reference count decrements and becomes one.
//
wchar_t self[MAX_PATH];
if (0 == GetModuleFileNameW((HINSTANCE)&__ImageBase, self, _countof(self)))
{
throw std::runtime_error("Failed to pin plugin module");
}
LoadLibraryW(self);
}
} // anonymous namespace
//
// EstablishBaseline
//
// Invoke with the output from "tapinstall hwids tap0901"
// e.g.: driverlogic::EstablishBaseline $1
//
enum class EstablishBaselineStatus
{
GENERAL_ERROR = 0,
NO_INTERFACES_PRESENT,
SOME_INTERFACES_PRESENT,
MULLVAD_INTERFACE_PRESENT
};
void __declspec(dllexport) NSISCALL EstablishBaseline
(
HWND hwndParent,
int string_size,
LPTSTR variables,
stack_t **stacktop,
extra_parameters *extra,
...
)
{
EXDLL_INIT();
try
{
PinDll();
auto status = EstablishBaselineStatus::GENERAL_ERROR;
switch (g_context.establishBaseline(PopString()))
{
case Context::BaselineStatus::NO_INTERFACES_PRESENT:
{
status = EstablishBaselineStatus::NO_INTERFACES_PRESENT;
break;
}
case Context::BaselineStatus::SOME_INTERFACES_PRESENT:
{
status = EstablishBaselineStatus::SOME_INTERFACES_PRESENT;
break;
}
case Context::BaselineStatus::MULLVAD_INTERFACE_PRESENT:
{
status = EstablishBaselineStatus::MULLVAD_INTERFACE_PRESENT;
break;
}
default:
{
throw std::runtime_error("Missing case handler in switch clause");
}
}
pushstring(L"");
pushint(status);
}
catch (std::exception &err)
{
pushstring(common::string::ToWide(err.what()).c_str());
pushint(EstablishBaselineStatus::GENERAL_ERROR);
}
}
//
// IdentifyNewInterface
//
// Invoke with the output from "tapinstall hwids tap0901"
// e.g.: driverlogic::IdentifyNewInterface $1
//
enum class IdentifyNewInterfaceStatus
{
GENERAL_ERROR = 0,
SUCCESS
};
void __declspec(dllexport) NSISCALL IdentifyNewInterface
(
HWND hwndParent,
int string_size,
LPTSTR variables,
stack_t **stacktop,
extra_parameters *extra,
...
)
{
EXDLL_INIT();
try
{
g_context.recordCurrentState(PopString());
auto nic = g_context.getNewAdapter();
pushstring(nic.alias.c_str());
pushint(IdentifyNewInterfaceStatus::SUCCESS);
}
catch (std::exception &err)
{
pushstring(common::string::ToWide(err.what()).c_str());
pushint(IdentifyNewInterfaceStatus::GENERAL_ERROR);
}
}
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