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@ssrlive
Created June 11, 2022 10:00
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/* SPDX-License-Identifier: GPL-2.0
*
* Copyright (C) 2018-2021 WireGuard LLC. All Rights Reserved.
*/
#include <winsock2.h>
#include <Windows.h>
#include <ws2ipdef.h>
#include <iphlpapi.h>
#include <mstcpip.h>
//#include <ip2string.h>
#include <in6addr.h>
#include <winternl.h>
#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>
#if !defined(_Must_inspect_result_)
#define _Must_inspect_result_
#endif
#if !defined(_Return_type_success_)
#define _Return_type_success_(x)
#endif
#if !defined(_Post_writable_byte_size_)
#define _Post_writable_byte_size_(x)
#endif
#if !defined(_In_reads_bytes_)
#define _In_reads_bytes_(x)
#endif
#if !defined(_Out_writes_bytes_all_)
#define _Out_writes_bytes_all_(x)
#endif
#if !defined(LOAD_LIBRARY_SEARCH_APPLICATION_DIR)
#define LOAD_LIBRARY_SEARCH_APPLICATION_DIR 0x00000200
#endif
#if !defined(LOAD_LIBRARY_SEARCH_SYSTEM32)
#define LOAD_LIBRARY_SEARCH_SYSTEM32 0x00000800
#endif
#include "wintun.h"
#pragma comment(lib, "iphlpapi.lib")
#pragma comment(lib, "ws2_32.lib")
static WINTUN_CREATE_ADAPTER_FUNC *WintunCreateAdapter;
static WINTUN_CLOSE_ADAPTER_FUNC *WintunCloseAdapter;
static WINTUN_OPEN_ADAPTER_FUNC *WintunOpenAdapter;
static WINTUN_GET_ADAPTER_LUID_FUNC *WintunGetAdapterLUID;
static WINTUN_GET_RUNNING_DRIVER_VERSION_FUNC *WintunGetRunningDriverVersion;
static WINTUN_DELETE_DRIVER_FUNC *WintunDeleteDriver;
static WINTUN_SET_LOGGER_FUNC *WintunSetLogger;
static WINTUN_START_SESSION_FUNC *WintunStartSession;
static WINTUN_END_SESSION_FUNC *WintunEndSession;
static WINTUN_GET_READ_WAIT_EVENT_FUNC *WintunGetReadWaitEvent;
static WINTUN_RECEIVE_PACKET_FUNC *WintunReceivePacket;
static WINTUN_RELEASE_RECEIVE_PACKET_FUNC *WintunReleaseReceivePacket;
static WINTUN_ALLOCATE_SEND_PACKET_FUNC *WintunAllocateSendPacket;
static WINTUN_SEND_PACKET_FUNC *WintunSendPacket;
static HMODULE
InitializeWintun(void)
{
HMODULE Wintun =
LoadLibraryExW(L"wintun.dll", NULL, LOAD_LIBRARY_SEARCH_APPLICATION_DIR | LOAD_LIBRARY_SEARCH_SYSTEM32);
if (!Wintun)
return NULL;
#define X(Name) ((*(FARPROC *)&Name = GetProcAddress(Wintun, #Name)) == NULL)
if (X(WintunCreateAdapter) || X(WintunCloseAdapter) || X(WintunOpenAdapter) || X(WintunGetAdapterLUID) ||
X(WintunGetRunningDriverVersion) || X(WintunDeleteDriver) || X(WintunSetLogger) || X(WintunStartSession) ||
X(WintunEndSession) || X(WintunGetReadWaitEvent) || X(WintunReceivePacket) || X(WintunReleaseReceivePacket) ||
X(WintunAllocateSendPacket) || X(WintunSendPacket))
#undef X
{
DWORD LastError = GetLastError();
FreeLibrary(Wintun);
SetLastError(LastError);
return NULL;
}
return Wintun;
}
static void CALLBACK
ConsoleLogger(_In_ WINTUN_LOGGER_LEVEL Level, _In_ DWORD64 Timestamp, _In_z_ const WCHAR *LogLine)
{
WCHAR LevelMarker;
SYSTEMTIME SystemTime;
FileTimeToSystemTime((FILETIME *)&Timestamp, &SystemTime);
switch (Level)
{
case WINTUN_LOG_INFO:
LevelMarker = L'+';
break;
case WINTUN_LOG_WARN:
LevelMarker = L'-';
break;
case WINTUN_LOG_ERR:
LevelMarker = L'!';
break;
default:
return;
}
fwprintf(
stderr,
L"%04u-%02u-%02u %02u:%02u:%02u.%04u [%c] %s\n",
SystemTime.wYear,
SystemTime.wMonth,
SystemTime.wDay,
SystemTime.wHour,
SystemTime.wMinute,
SystemTime.wSecond,
SystemTime.wMilliseconds,
LevelMarker,
LogLine);
}
static DWORD64 Now(VOID)
{
HMODULE hNtDll = GetModuleHandleA("ntdll.dll");
NTSTATUS(WINAPI * NtQuerySystemTime)(PLARGE_INTEGER) =
(NTSTATUS(WINAPI*)(PLARGE_INTEGER))GetProcAddress(hNtDll, "NtQuerySystemTime");
LARGE_INTEGER Timestamp;
NtQuerySystemTime(&Timestamp);
return Timestamp.QuadPart;
}
static DWORD
LogError(_In_z_ const WCHAR *Prefix, _In_ DWORD Error)
{
WCHAR *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),
(LPWSTR)&SystemMessage,
0,
NULL);
{
DWORD_PTR valist[] = {
(DWORD_PTR)Prefix, (DWORD_PTR)Error, (DWORD_PTR)SystemMessage
};
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,
(LPWSTR)&FormattedMessage,
0,
(va_list*)valist);
}
if (FormattedMessage)
ConsoleLogger(WINTUN_LOG_ERR, Now(), FormattedMessage);
LocalFree(FormattedMessage);
LocalFree(SystemMessage);
return Error;
}
static DWORD
LogLastError(_In_z_ const WCHAR *Prefix)
{
DWORD LastError = GetLastError();
LogError(Prefix, LastError);
SetLastError(LastError);
return LastError;
}
static void
Log(_In_ WINTUN_LOGGER_LEVEL Level, _In_z_ const WCHAR *Format, ...)
{
WCHAR LogLine[0x200];
va_list args;
va_start(args, Format);
_vsnwprintf_s(LogLine, _countof(LogLine), _TRUNCATE, Format, args);
va_end(args);
ConsoleLogger(Level, Now(), LogLine);
}
static HANDLE QuitEvent;
static volatile BOOL HaveQuit;
static BOOL WINAPI
CtrlHandler(_In_ DWORD CtrlType)
{
switch (CtrlType)
{
case CTRL_C_EVENT:
case CTRL_BREAK_EVENT:
case CTRL_CLOSE_EVENT:
case CTRL_LOGOFF_EVENT:
case CTRL_SHUTDOWN_EVENT:
Log(WINTUN_LOG_INFO, L"Cleaning up and shutting down...");
HaveQuit = TRUE;
SetEvent(QuitEvent);
return TRUE;
}
return FALSE;
}
static void
PrintPacket(_In_ const BYTE *Packet, _In_ DWORD PacketSize)
{
BYTE IpVersion, Proto;
WCHAR Src[46], Dst[46];
if (PacketSize < 20)
{
Log(WINTUN_LOG_INFO, L"Received packet without room for an IP header");
return;
}
IpVersion = Packet[0] >> 4;
if (IpVersion == 4)
{
HMODULE hNtDll = GetModuleHandleA("ntdll.dll");
PWSTR(WINAPI * RtlIpv4AddressToStringW)(const struct in_addr*, PWSTR) =
(PWSTR(WINAPI*)(const struct in_addr*, PWSTR))GetProcAddress(hNtDll, "RtlIpv4AddressToStringW");
RtlIpv4AddressToStringW((struct in_addr *)&Packet[12], Src);
RtlIpv4AddressToStringW((struct in_addr *)&Packet[16], Dst);
Proto = Packet[9];
Packet += 20, PacketSize -= 20;
}
else if (IpVersion == 6 && PacketSize < 40)
{
Log(WINTUN_LOG_INFO, L"Received packet without room for an IP header");
return;
}
else if (IpVersion == 6)
{
HMODULE hNtDll = GetModuleHandleA("ntdll.dll");
PWSTR(WINAPI * RtlIpv6AddressToStringW)(const struct in6_addr*, PWSTR) =
(PWSTR(WINAPI*)(const struct in6_addr*, PWSTR))GetProcAddress(hNtDll, "RtlIpv6AddressToStringW");
RtlIpv6AddressToStringW((struct in6_addr *)&Packet[8], Src);
RtlIpv6AddressToStringW((struct in6_addr *)&Packet[24], Dst);
Proto = Packet[6];
Packet += 40, PacketSize -= 40;
}
else
{
Log(WINTUN_LOG_INFO, L"Received packet that was not IP");
return;
}
if (Proto == 1 && PacketSize >= 8 && Packet[0] == 0) {
Log(WINTUN_LOG_INFO, L"Received IPv%d ICMP echo reply from %s to %s", IpVersion, Src, Dst);
}
else {
Log(WINTUN_LOG_INFO, L"Received IPv%d proto 0x%x packet from %s to %s", IpVersion, Proto, Src, Dst);
}
}
static USHORT
IPChecksum(_In_reads_bytes_(Len) BYTE *Buffer, _In_ DWORD Len)
{
ULONG Sum = 0;
for (; Len > 1; Len -= 2, Buffer += 2)
Sum += *(USHORT *)Buffer;
if (Len)
Sum += *Buffer;
Sum = (Sum >> 16) + (Sum & 0xffff);
Sum += (Sum >> 16);
return (USHORT)(~Sum);
}
static void
MakeICMP(_Out_writes_bytes_all_(28) BYTE Packet[28])
{
memset(Packet, 0, 28);
Packet[0] = 0x45;
*(USHORT *)&Packet[2] = htons(28);
Packet[8] = 255;
Packet[9] = 1;
*(ULONG *)&Packet[12] = htonl((10 << 24) | (6 << 16) | (7 << 8) | (8 << 0)); /* 10.6.7.8 */
*(ULONG *)&Packet[16] = htonl((10 << 24) | (6 << 16) | (7 << 8) | (7 << 0)); /* 10.6.7.7 */
*(USHORT *)&Packet[10] = IPChecksum(Packet, 20);
Packet[20] = 8;
*(USHORT *)&Packet[22] = IPChecksum(&Packet[20], 8);
Log(WINTUN_LOG_INFO, L"Sending IPv4 ICMP echo request to 10.6.7.8 from 10.6.7.7");
}
static DWORD WINAPI
ReceivePackets(_Inout_ DWORD_PTR SessionPtr)
{
WINTUN_SESSION_HANDLE Session = (WINTUN_SESSION_HANDLE)SessionPtr;
HANDLE WaitHandles[] = { WintunGetReadWaitEvent(Session), QuitEvent };
while (!HaveQuit)
{
DWORD PacketSize;
BYTE *Packet = WintunReceivePacket(Session, &PacketSize);
if (Packet)
{
PrintPacket(Packet, PacketSize);
WintunReleaseReceivePacket(Session, Packet);
}
else
{
DWORD LastError = GetLastError();
switch (LastError)
{
case ERROR_NO_MORE_ITEMS:
if (WaitForMultipleObjects(_countof(WaitHandles), WaitHandles, FALSE, INFINITE) == WAIT_OBJECT_0)
continue;
return ERROR_SUCCESS;
default:
LogError(L"Packet read failed", LastError);
return LastError;
}
}
}
return ERROR_SUCCESS;
}
static DWORD WINAPI
SendPackets(_Inout_ DWORD_PTR SessionPtr)
{
WINTUN_SESSION_HANDLE Session = (WINTUN_SESSION_HANDLE)SessionPtr;
while (!HaveQuit)
{
BYTE *Packet = WintunAllocateSendPacket(Session, 28);
if (Packet)
{
MakeICMP(Packet);
WintunSendPacket(Session, Packet);
}
else if (GetLastError() != ERROR_BUFFER_OVERFLOW)
return LogLastError(L"Packet write failed");
switch (WaitForSingleObject(QuitEvent, 1000 /* 1 second */))
{
case WAIT_ABANDONED:
case WAIT_OBJECT_0:
return ERROR_SUCCESS;
}
}
return ERROR_SUCCESS;
}
int __cdecl main(void)
{
DWORD LastError;
GUID ExampleGuid = { 0xdeadbabe, 0xcafe, 0xbeef, { 0x01, 0x23, 0x45, 0x67, 0x89, 0xab, 0xcd, 0xef } };
WINTUN_ADAPTER_HANDLE Adapter;
DWORD Version;
MIB_UNICASTIPADDRESS_ROW AddressRow;
WINTUN_SESSION_HANDLE Session;
HMODULE Wintun = InitializeWintun();
if (!Wintun)
return LogError(L"Failed to initialize Wintun", GetLastError());
WintunSetLogger(ConsoleLogger);
Log(WINTUN_LOG_INFO, L"Wintun library loaded");
HaveQuit = FALSE;
QuitEvent = CreateEventW(NULL, TRUE, FALSE, NULL);
if (!QuitEvent)
{
LastError = LogError(L"Failed to create event", GetLastError());
goto cleanupWintun;
}
if (!SetConsoleCtrlHandler(CtrlHandler, TRUE))
{
LastError = LogError(L"Failed to set console handler", GetLastError());
goto cleanupQuit;
}
Adapter = WintunCreateAdapter(L"Demo", L"Example", &ExampleGuid);
if (!Adapter)
{
LastError = GetLastError();
LogError(L"Failed to create adapter", LastError);
goto cleanupQuit;
}
Version = WintunGetRunningDriverVersion();
Log(WINTUN_LOG_INFO, L"Wintun v%u.%u loaded", (Version >> 16) & 0xff, (Version >> 0) & 0xff);
InitializeUnicastIpAddressEntry(&AddressRow);
WintunGetAdapterLUID(Adapter, &AddressRow.InterfaceLuid);
AddressRow.Address.Ipv4.sin_family = AF_INET;
AddressRow.Address.Ipv4.sin_addr.S_un.S_addr = htonl((10 << 24) | (6 << 16) | (7 << 8) | (7 << 0)); /* 10.6.7.7 */
AddressRow.OnLinkPrefixLength = 24; /* This is a /24 network */
AddressRow.DadState = IpDadStatePreferred;
LastError = CreateUnicastIpAddressEntry(&AddressRow);
if (LastError != ERROR_SUCCESS && LastError != ERROR_OBJECT_ALREADY_EXISTS)
{
LogError(L"Failed to set IP address", LastError);
goto cleanupAdapter;
}
Session = WintunStartSession(Adapter, 0x400000);
if (!Session)
{
LastError = LogLastError(L"Failed to create adapter");
goto cleanupAdapter;
}
Log(WINTUN_LOG_INFO, L"Launching threads and mangling packets...");
{
size_t i;
HANDLE Workers[] = { CreateThread(NULL, 0, (LPTHREAD_START_ROUTINE)ReceivePackets, (LPVOID)Session, 0, NULL),
CreateThread(NULL, 0, (LPTHREAD_START_ROUTINE)SendPackets, (LPVOID)Session, 0, NULL) };
if (!Workers[0] || !Workers[1])
{
LastError = LogError(L"Failed to create threads", GetLastError());
goto cleanupWorkers;
}
WaitForMultipleObjectsEx(_countof(Workers), Workers, TRUE, INFINITE, TRUE);
LastError = ERROR_SUCCESS;
cleanupWorkers:
HaveQuit = TRUE;
SetEvent(QuitEvent);
for (i = 0; i < _countof(Workers); ++i)
{
if (Workers[i])
{
WaitForSingleObject(Workers[i], INFINITE);
CloseHandle(Workers[i]);
}
}
}
WintunEndSession(Session);
cleanupAdapter:
WintunCloseAdapter(Adapter);
cleanupQuit:
SetConsoleCtrlHandler(CtrlHandler, FALSE);
CloseHandle(QuitEvent);
cleanupWintun:
FreeLibrary(Wintun);
return LastError;
}
@Nikhiladiga
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Thank you for the code! Is there any way to use multiple Wintun Sessions? I need to create a Wintun interface in one program and access the adapter's session from multiple programs. Is this possible?

@ssrlive
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ssrlive commented Jun 21, 2022

meybe you can create adapter with WintunCreateAdapter in one process, and use WintunGetAdapterLUID to get adaper in anohter process. I have no experencies on it. just a advance.

@Nikhiladiga
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meybe you can create adapter with WintunCreateAdapter in one process, and use WintunGetAdapterLUID to get adaper in anohter process. I have no experencies on it. just a advance.

Thank you for replying, I was able to get the adapter using a function from the Wintun library called WintunOpenAdapter, but when trying to start a new Wintun Session I end up getting error code 1247
An attempt was made to perform an initialization operation when initialization has already been performed

@ssrlive
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ssrlive commented Jun 21, 2022

I think, there need not initialization before WintunOpenAdapter in another proess.

@Nikhiladiga
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We need to initialize to use Wintun functions.

@tristandmelli
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When I run this code, I get a slew of errors.

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