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/* SPDX-License-Identifier: GPL-2.0
*
* Copyright (C) 2018-2021 WireGuard LLC. All Rights Reserved.
*/
#include "../driver/ioctl.h"
#include "logger.h"
#include "adapter.h"
#include "ntdll.h"
#include <Windows.h>
#include <iphlpapi.h>
#include <winternl.h>
#include <wchar.h>
#include <stdlib.h>
static BOOL CALLBACK
NopLogger(_In_ WIREGUARD_LOGGER_LEVEL Level, _In_ DWORD64 Timestamp, _In_z_ LPCWSTR LogLine)
{
return TRUE;
}
WIREGUARD_LOGGER_CALLBACK Logger = NopLogger;
static DWORD64 Now(VOID)
{
LARGE_INTEGER Timestamp;
NtQuerySystemTime(&Timestamp);
return Timestamp.QuadPart;
}
_Use_decl_annotations_
VOID WINAPI
WireGuardSetLogger(WIREGUARD_LOGGER_CALLBACK NewLogger)
{
if (!NewLogger)
NewLogger = NopLogger;
Logger = NewLogger;
}
static VOID
StrTruncate(_Inout_count_(StrChars) LPWSTR Str, _In_ SIZE_T StrChars)
{
Str[StrChars - 2] = L'\u2026'; /* Horizontal Ellipsis */
Str[StrChars - 1] = 0;
}
_Use_decl_annotations_
DWORD
LoggerLog(WIREGUARD_LOGGER_LEVEL Level, LPCWSTR LogLine)
{
DWORD LastError = GetLastError();
Logger(Level, Now(), LogLine);
SetLastError(LastError);
return LastError;
}
_Use_decl_annotations_
DWORD
LoggerLogV(WIREGUARD_LOGGER_LEVEL Level, LPCWSTR Format, va_list Args)
{
DWORD LastError = GetLastError();
WCHAR LogLine[0x400];
if (_vsnwprintf_s(LogLine, _countof(LogLine), _TRUNCATE, Format, Args) == -1)
StrTruncate(LogLine, _countof(LogLine));
Logger(Level, Now(), LogLine);
SetLastError(LastError);
return LastError;
}
_Use_decl_annotations_
DWORD
LoggerError(DWORD Error, LPCWSTR Prefix)
{
LPWSTR SystemMessage = NULL, FormattedMessage = NULL;
FormatMessageW(
FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_ALLOCATE_BUFFER | FORMAT_MESSAGE_MAX_WIDTH_MASK,
NULL,
HRESULT_FROM_SETUPAPI(Error),
MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT),
(VOID *)&SystemMessage,
0,
NULL);
FormatMessageW(
FORMAT_MESSAGE_FROM_STRING | FORMAT_MESSAGE_ALLOCATE_BUFFER | FORMAT_MESSAGE_ARGUMENT_ARRAY |
FORMAT_MESSAGE_MAX_WIDTH_MASK,
SystemMessage ? L"%1: %3(Code 0x%2!08X!)" : L"%1: Code 0x%2!08X!",
0,
0,
(VOID *)&FormattedMessage,
0,
(va_list *)(DWORD_PTR[]){ (DWORD_PTR)Prefix, (DWORD_PTR)Error, (DWORD_PTR)SystemMessage });
if (FormattedMessage)
Logger(WIREGUARD_LOG_ERR, Now(), FormattedMessage);
LocalFree(FormattedMessage);
LocalFree(SystemMessage);
return Error;
}
_Use_decl_annotations_
DWORD
LoggerErrorV(DWORD Error, LPCWSTR Format, va_list Args)
{
WCHAR LogLine[0x400];
if (_vsnwprintf_s(LogLine, _countof(LogLine), _TRUNCATE, Format, Args) == -1)
StrTruncate(LogLine, _countof(LogLine));
return LoggerError(Error, LogLine);
}
_Use_decl_annotations_
VOID
LoggerGetRegistryKeyPath(HKEY Key, LPWSTR Path)
{
DWORD LastError = GetLastError();
if (Key == NULL)
{
wcsncpy_s(Path, MAX_REG_PATH, L"<null>", _TRUNCATE);
goto out;
}
if (_snwprintf_s(Path, MAX_REG_PATH, _TRUNCATE, L"0x%p", Key) == -1)
StrTruncate(Path, MAX_REG_PATH);
union
{
KEY_NAME_INFORMATION KeyNameInfo;
WCHAR Data[offsetof(KEY_NAME_INFORMATION, Name) + MAX_REG_PATH];
} Buffer;
DWORD Size;
if (!NT_SUCCESS(NtQueryKey(Key, 3, &Buffer, sizeof(Buffer), &Size)) ||
Size < offsetof(KEY_NAME_INFORMATION, Name) || Buffer.KeyNameInfo.NameLength >= MAX_REG_PATH * sizeof(WCHAR))
goto out;
Buffer.KeyNameInfo.NameLength /= sizeof(WCHAR);
wmemcpy_s(Path, MAX_REG_PATH, Buffer.KeyNameInfo.Name, Buffer.KeyNameInfo.NameLength);
Path[Buffer.KeyNameInfo.NameLength] = L'\0';
out:
SetLastError(LastError);
}
static DWORD WINAPI
LogReaderThread(_In_ LPVOID Parameter)
{
WIREGUARD_ADAPTER *Adapter = Parameter;
HANDLE ControlFile = AdapterOpenDeviceObject(Adapter);
if (ControlFile == INVALID_HANDLE_VALUE)
{
LOG_LAST_ERROR(L"Unable to enable logging");
WriteULongNoFence(&Adapter->LogState, WIREGUARD_ADAPTER_LOG_OFF);
return 0;
}
while (ReadULongNoFence(&Adapter->LogState) != WIREGUARD_ADAPTER_LOG_OFF)
{
WG_IOCTL_LOG_ENTRY Entry = { 0 };
WCHAR WideLine[sizeof(Entry.Msg) + 32] = { 0 };
DWORD Bytes = sizeof(Entry);
if (!DeviceIoControl(ControlFile, WG_IOCTL_READ_LOG_LINE, NULL, 0, &Entry, Bytes, &Bytes, NULL))
{
BOOL IsAbort = GetLastError() == ERROR_OPERATION_ABORTED;
CloseHandle(ControlFile);
if (ReadULongNoFence(&Adapter->LogState) == WIREGUARD_ADAPTER_LOG_OFF)
return 0;
if (IsAbort)
Sleep(5000);
for (DWORD i = 0;; ++i)
{
ControlFile = AdapterOpenDeviceObject(Adapter);
if (ControlFile == INVALID_HANDLE_VALUE)
{
if (i < 10 && ReadULongNoFence(&Adapter->LogState) != WIREGUARD_ADAPTER_LOG_OFF)
{
Sleep(1000);
continue;
}
LOG_LAST_ERROR(L"Failed to reopen handle for logging after adapter disappeared");
WriteULongNoFence(&Adapter->LogState, WIREGUARD_ADAPTER_LOG_OFF);
return 0;
}
else
break;
}
continue;
}
WIREGUARD_LOGGER_LEVEL Level;
if (Entry.Msg[0] == '1')
Level = WIREGUARD_LOG_ERR;
else if (Entry.Msg[0] == '2')
Level = WIREGUARD_LOG_WARN;
else if (Entry.Msg[0] == '3')
Level = WIREGUARD_LOG_INFO;
else
continue;
DWORD Offset = 0;
if (ReadULongNoFence(&Adapter->LogState) == WIREGUARD_ADAPTER_LOG_ON_WITH_PREFIX)
{
if (!Adapter->IfIndex)
{
NET_LUID Luid;
WireGuardGetAdapterLUID(Adapter, &Luid);
ConvertInterfaceLuidToIndex(&Luid, &Adapter->IfIndex);
}
Offset = swprintf_s(WideLine, _countof(WideLine), L"%u: ", Adapter->IfIndex);
}
if (!MultiByteToWideChar(CP_UTF8, 0, &Entry.Msg[1], -1, WideLine + Offset, _countof(WideLine) - Offset))
continue;
Logger(Level, Entry.Timestamp, WideLine);
}
CloseHandle(ControlFile);
return 0;
}
_Use_decl_annotations_
BOOL WINAPI
WireGuardSetAdapterLogging(WIREGUARD_ADAPTER *Adapter, WIREGUARD_ADAPTER_LOG_STATE LogState)
{
DWORD CurrentState = ReadULongNoFence(&Adapter->LogState);
if (CurrentState == (DWORD)LogState)
return TRUE;
WriteULongNoFence(&Adapter->LogState, LogState);
if (CurrentState != WIREGUARD_ADAPTER_LOG_OFF && LogState == WIREGUARD_ADAPTER_LOG_OFF && Adapter->LogThread)
{
CancelSynchronousIo(Adapter->LogThread);
BOOL Ret = WaitForSingleObject(Adapter->LogThread, INFINITE);
CloseHandle(Adapter->LogThread);
Adapter->LogThread = NULL;
return Ret;
}
if (CurrentState == WIREGUARD_ADAPTER_LOG_OFF && LogState != WIREGUARD_ADAPTER_LOG_OFF && !Adapter->LogThread)
{
Adapter->LogThread = CreateThread(NULL, 0, LogReaderThread, Adapter, 0, NULL);
return Adapter->LogThread != NULL;
}
return TRUE;
}
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