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#include "stdafx.h"
#include "logger.h"
#include <libcommon/string.h>
#include <libcommon/filesystem.h>
#include <windows.h>
#include <nsis/pluginapi.h>
#include <string>
#include <vector>
#include <memory>
#include <experimental/filesystem>
Logger *g_logger = nullptr;
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");
}
//
// For some reason, NSIS frees this particular DLL more times than it loads it
// so we have to up the reference count significantly.
//
for (int i = 0; i < 100; ++i)
{
LoadLibraryW(self);
}
}
std::vector<std::wstring> BlockToRows(const std::wstring &textBlock)
{
//
// This is such a hack :-(
//
// It only works because the tokenizer is greedy and because we don't care about
// empty lines for this usage.
//
return common::string::Tokenize(textBlock, L"\r\n");
}
} // anonymous namespace
//
// Initialize
//
// Opens and maintains an open handle to the log file.
//
void __declspec(dllexport) NSISCALL Initialize
(
HWND hwndParent,
int string_size,
LPTSTR variables,
stack_t **stacktop,
extra_parameters *extra,
...
)
{
EXDLL_INIT();
try
{
PinDll();
auto logfile = std::experimental::filesystem::path(common::fs::GetKnownFolderPath(
FOLDERID_ProgramData, 0, nullptr));
logfile.append(L"Mullvad VPN").append(L"install.log");
g_logger = new Logger(std::make_unique<AnsiFileLogSink>(logfile));
}
catch (...)
{
}
}
//
// Log
//
// Writes a message to the log file.
//
void __declspec(dllexport) NSISCALL Log
(
HWND hwndParent,
int string_size,
LPTSTR variables,
stack_t **stacktop,
extra_parameters *extra,
...
)
{
EXDLL_INIT();
try
{
const auto message = PopString();
if (g_logger != nullptr)
{
g_logger->log(message);
}
}
catch (...)
{
}
}
//
// LogWithDetails
//
// Writes a message to the log file.
//
void __declspec(dllexport) NSISCALL LogWithDetails
(
HWND hwndParent,
int string_size,
LPTSTR variables,
stack_t **stacktop,
extra_parameters *extra,
...
)
{
EXDLL_INIT();
try
{
const auto message = PopString();
const auto details = PopString();
if (g_logger != nullptr)
{
g_logger->log(message, BlockToRows(details));
}
}
catch (...)
{
}
}
//
// PluginLog
//
// Writes a message to the log file.
// Use from other plugins to avoid passing messages like this:
// other plugin -> NSIS -> log plugin
//
void __declspec(dllexport) NSISCALL PluginLog
(
const std::wstring &message
)
{
try
{
if (g_logger != nullptr)
{
g_logger->log(message);
}
}
catch (...)
{
}
}
//
// PluginLogWithDetails
//
void __declspec(dllexport) NSISCALL PluginLogWithDetails
(
const std::wstring &message,
const std::vector<std::wstring> &details
)
{
try
{
if (g_logger != nullptr)
{
g_logger->log(message, details);
}
}
catch (...)
{
}
}
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