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ZeroTierOne/osdep/WindowsEthernetTap.cpp

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/*
* Copyright (c)2019 ZeroTier, Inc.
*
* Use of this software is governed by the Business Source License included
* in the LICENSE.TXT file in the project's root directory.
*
* Change Date: 2026-01-01
*
* On the date above, in accordance with the Business Source License, use
* of this software will be governed by version 2.0 of the Apache License.
*/
/****/
#include <stdio.h>
#include <stdlib.h>
#include <stdint.h>
#include <string.h>
#include <winsock2.h>
#include <windows.h>
#include <tchar.h>
#include <malloc.h>
#include <winreg.h>
#include <wchar.h>
#include <ws2ipdef.h>
#include <ws2tcpip.h>
#include <IPHlpApi.h>
#include <nldef.h>
#include <netioapi.h>
#include <atlbase.h>
#include <netlistmgr.h>
#include <nldef.h>
#include <SetupAPI.h>
#include <newdev.h>
#include <cfgmgr32.h>
#include <iostream>
#include <set>
#include "../node/Constants.hpp"
#include "../node/Utils.hpp"
#include "../node/Mutex.hpp"
#include "WindowsEthernetTap.hpp"
#include "OSUtils.hpp"
#include "..\windows\TapDriver6\tap-windows.h"
#include "WinDNSHelper.hpp"
#include <netcon.h>
// Create a fake unused default route to force detection of network type on networks without gateways
#define ZT_WINDOWS_CREATE_FAKE_DEFAULT_ROUTE
// Function signatures of dynamically loaded functions, from newdev.h, setupapi.h, and cfgmgr32.h
typedef BOOL (WINAPI *UpdateDriverForPlugAndPlayDevicesA_t)(_In_opt_ HWND hwndParent,_In_ LPCSTR HardwareId,_In_ LPCSTR FullInfPath,_In_ DWORD InstallFlags,_Out_opt_ PBOOL bRebootRequired);
typedef BOOL (WINAPI *SetupDiGetINFClassA_t)(_In_ PCSTR InfName,_Out_ LPGUID ClassGuid,_Out_writes_(ClassNameSize) PSTR ClassName,_In_ DWORD ClassNameSize,_Out_opt_ PDWORD RequiredSize);
typedef HDEVINFO (WINAPI *SetupDiCreateDeviceInfoList_t)(_In_opt_ CONST GUID *ClassGuid,_In_opt_ HWND hwndParent);
typedef BOOL (WINAPI *SetupDiCreateDeviceInfoA_t)(_In_ HDEVINFO DeviceInfoSet,_In_ PCSTR DeviceName,_In_ CONST GUID *ClassGuid,_In_opt_ PCSTR DeviceDescription,_In_opt_ HWND hwndParent,_In_ DWORD CreationFlags,_Out_opt_ PSP_DEVINFO_DATA DeviceInfoData);
typedef BOOL (WINAPI *SetupDiSetDeviceRegistryPropertyA_t)(_In_ HDEVINFO DeviceInfoSet,_Inout_ PSP_DEVINFO_DATA DeviceInfoData,_In_ DWORD Property,_In_reads_bytes_opt_(PropertyBufferSize) CONST BYTE *PropertyBuffer,_In_ DWORD PropertyBufferSize);
typedef BOOL (WINAPI *SetupDiCallClassInstaller_t)(_In_ DI_FUNCTION InstallFunction,_In_ HDEVINFO DeviceInfoSet,_In_opt_ PSP_DEVINFO_DATA DeviceInfoData);
typedef BOOL (WINAPI *SetupDiDestroyDeviceInfoList_t)(_In_ HDEVINFO DeviceInfoSet);
typedef HDEVINFO (WINAPI *SetupDiGetClassDevsExA_t)(_In_opt_ CONST GUID *ClassGuid,_In_opt_ PCSTR Enumerator,_In_opt_ HWND hwndParent,_In_ DWORD Flags,_In_opt_ HDEVINFO DeviceInfoSet,_In_opt_ PCSTR MachineName,_Reserved_ PVOID Reserved);
typedef BOOL (WINAPI *SetupDiOpenDeviceInfoA_t)(_In_ HDEVINFO DeviceInfoSet,_In_ PCSTR DeviceInstanceId,_In_opt_ HWND hwndParent,_In_ DWORD OpenFlags,_Out_opt_ PSP_DEVINFO_DATA DeviceInfoData);
typedef BOOL (WINAPI *SetupDiEnumDeviceInfo_t)(_In_ HDEVINFO DeviceInfoSet,_In_ DWORD MemberIndex,_Out_ PSP_DEVINFO_DATA DeviceInfoData);
typedef BOOL (WINAPI *SetupDiSetClassInstallParamsA_t)(_In_ HDEVINFO DeviceInfoSet,_In_opt_ PSP_DEVINFO_DATA DeviceInfoData,_In_reads_bytes_opt_(ClassInstallParamsSize) PSP_CLASSINSTALL_HEADER ClassInstallParams,_In_ DWORD ClassInstallParamsSize);
typedef CONFIGRET (WINAPI *CM_Get_Device_ID_ExA_t)(_In_ DEVINST dnDevInst,_Out_writes_(BufferLen) PSTR Buffer,_In_ ULONG BufferLen,_In_ ULONG ulFlags,_In_opt_ HMACHINE hMachine);
typedef BOOL (WINAPI *SetupDiGetDeviceInstanceIdA_t)(_In_ HDEVINFO DeviceInfoSet,_In_ PSP_DEVINFO_DATA DeviceInfoData,_Out_writes_opt_(DeviceInstanceIdSize) PSTR DeviceInstanceId,_In_ DWORD DeviceInstanceIdSize,_Out_opt_ PDWORD RequiredSize);
namespace ZeroTier {
namespace {
// Static/singleton class that when initialized loads a bunch of environment information and a few dynamically loaded DLLs
class WindowsEthernetTapEnv
{
public:
WindowsEthernetTapEnv()
{
#ifdef _WIN64
is64Bit = TRUE;
//tapDriverPath = "\\tap-windows\\x64\\zttap300.inf";
#else
is64Bit = FALSE;
IsWow64Process(GetCurrentProcess(),&is64Bit);
if (is64Bit) {
fprintf(stderr,"FATAL: you must use the 64-bit ZeroTier One service on 64-bit Windows systems\r\n");
_exit(1);
}
//tapDriverPath = "\\tap-windows\\x86\\zttap300.inf";
#endif
tapDriverName = "zttap300";
tapDriverPath = "\\zttap300.inf";
setupApiMod = LoadLibraryA("setupapi.dll");
if (!setupApiMod) {
fprintf(stderr,"FATAL: unable to dynamically load setupapi.dll\r\n");
_exit(1);
}
if (!(this->SetupDiGetINFClassA = (SetupDiGetINFClassA_t)GetProcAddress(setupApiMod,"SetupDiGetINFClassA"))) {
fprintf(stderr,"FATAL: SetupDiGetINFClassA not found in setupapi.dll\r\n");
_exit(1);
}
if (!(this->SetupDiCreateDeviceInfoList = (SetupDiCreateDeviceInfoList_t)GetProcAddress(setupApiMod,"SetupDiCreateDeviceInfoList"))) {
fprintf(stderr,"FATAL: SetupDiCreateDeviceInfoList not found in setupapi.dll\r\n");
_exit(1);
}
if (!(this->SetupDiCreateDeviceInfoA = (SetupDiCreateDeviceInfoA_t)GetProcAddress(setupApiMod,"SetupDiCreateDeviceInfoA"))) {
fprintf(stderr,"FATAL: SetupDiCreateDeviceInfoA not found in setupapi.dll\r\n");
_exit(1);
}
if (!(this->SetupDiSetDeviceRegistryPropertyA = (SetupDiSetDeviceRegistryPropertyA_t)GetProcAddress(setupApiMod,"SetupDiSetDeviceRegistryPropertyA"))) {
fprintf(stderr,"FATAL: SetupDiSetDeviceRegistryPropertyA not found in setupapi.dll\r\n");
_exit(1);
}
if (!(this->SetupDiCallClassInstaller = (SetupDiCallClassInstaller_t)GetProcAddress(setupApiMod,"SetupDiCallClassInstaller"))) {
fprintf(stderr,"FATAL: SetupDiCallClassInstaller not found in setupapi.dll\r\n");
_exit(1);
}
if (!(this->SetupDiDestroyDeviceInfoList = (SetupDiDestroyDeviceInfoList_t)GetProcAddress(setupApiMod,"SetupDiDestroyDeviceInfoList"))) {
fprintf(stderr,"FATAL: SetupDiDestroyDeviceInfoList not found in setupapi.dll\r\n");
_exit(1);
}
if (!(this->SetupDiGetClassDevsExA = (SetupDiGetClassDevsExA_t)GetProcAddress(setupApiMod,"SetupDiGetClassDevsExA"))) {
fprintf(stderr,"FATAL: SetupDiGetClassDevsExA not found in setupapi.dll\r\n");
_exit(1);
}
if (!(this->SetupDiOpenDeviceInfoA = (SetupDiOpenDeviceInfoA_t)GetProcAddress(setupApiMod,"SetupDiOpenDeviceInfoA"))) {
fprintf(stderr,"FATAL: SetupDiOpenDeviceInfoA not found in setupapi.dll\r\n");
_exit(1);
}
if (!(this->SetupDiEnumDeviceInfo = (SetupDiEnumDeviceInfo_t)GetProcAddress(setupApiMod,"SetupDiEnumDeviceInfo"))) {
fprintf(stderr,"FATAL: SetupDiEnumDeviceInfo not found in setupapi.dll\r\n");
_exit(1);
}
if (!(this->SetupDiSetClassInstallParamsA = (SetupDiSetClassInstallParamsA_t)GetProcAddress(setupApiMod,"SetupDiSetClassInstallParamsA"))) {
fprintf(stderr,"FATAL: SetupDiSetClassInstallParamsA not found in setupapi.dll\r\n");
_exit(1);
}
if (!(this->SetupDiGetDeviceInstanceIdA = (SetupDiGetDeviceInstanceIdA_t)GetProcAddress(setupApiMod,"SetupDiGetDeviceInstanceIdA"))) {
fprintf(stderr,"FATAL: SetupDiGetDeviceInstanceIdA not found in setupapi.dll\r\n");
_exit(1);
}
newDevMod = LoadLibraryA("newdev.dll");
if (!newDevMod) {
fprintf(stderr,"FATAL: unable to dynamically load newdev.dll\r\n");
_exit(1);
}
if (!(this->UpdateDriverForPlugAndPlayDevicesA = (UpdateDriverForPlugAndPlayDevicesA_t)GetProcAddress(newDevMod,"UpdateDriverForPlugAndPlayDevicesA"))) {
fprintf(stderr,"FATAL: UpdateDriverForPlugAndPlayDevicesA not found in newdev.dll\r\n");
_exit(1);
}
cfgMgrMod = LoadLibraryA("cfgmgr32.dll");
if (!cfgMgrMod) {
fprintf(stderr,"FATAL: unable to dynamically load cfgmgr32.dll\r\n");
_exit(1);
}
if (!(this->CM_Get_Device_ID_ExA = (CM_Get_Device_ID_ExA_t)GetProcAddress(cfgMgrMod,"CM_Get_Device_ID_ExA"))) {
fprintf(stderr,"FATAL: CM_Get_Device_ID_ExA not found in cfgmgr32.dll\r\n");
_exit(1);
}
}
BOOL is64Bit; // is the system 64-bit, regardless of whether this binary is or not
std::string tapDriverPath;
std::string tapDriverName;
UpdateDriverForPlugAndPlayDevicesA_t UpdateDriverForPlugAndPlayDevicesA;
SetupDiGetINFClassA_t SetupDiGetINFClassA;
SetupDiCreateDeviceInfoList_t SetupDiCreateDeviceInfoList;
SetupDiCreateDeviceInfoA_t SetupDiCreateDeviceInfoA;
SetupDiSetDeviceRegistryPropertyA_t SetupDiSetDeviceRegistryPropertyA;
SetupDiCallClassInstaller_t SetupDiCallClassInstaller;
SetupDiDestroyDeviceInfoList_t SetupDiDestroyDeviceInfoList;
SetupDiGetClassDevsExA_t SetupDiGetClassDevsExA;
SetupDiOpenDeviceInfoA_t SetupDiOpenDeviceInfoA;
SetupDiEnumDeviceInfo_t SetupDiEnumDeviceInfo;
SetupDiSetClassInstallParamsA_t SetupDiSetClassInstallParamsA;
SetupDiGetDeviceInstanceIdA_t SetupDiGetDeviceInstanceIdA;
CM_Get_Device_ID_ExA_t CM_Get_Device_ID_ExA;
private:
HMODULE setupApiMod;
HMODULE newDevMod;
HMODULE cfgMgrMod;
};
static const WindowsEthernetTapEnv WINENV;
// Only create or delete devices one at a time
static Mutex _systemTapInitLock;
// Only perform installation or uninstallation options one at a time
static Mutex _systemDeviceManagementLock;
} // anonymous namespace
std::string WindowsEthernetTap::addNewPersistentTapDevice(const char *pathToInf,std::string &deviceInstanceId)
{
Mutex::Lock _l(_systemDeviceManagementLock);
GUID classGuid;
char className[1024];
if (!WINENV.SetupDiGetINFClassA(pathToInf,&classGuid,className,sizeof(className),(PDWORD)0)) {
return std::string("SetupDiGetINFClassA() failed -- unable to read zttap driver INF file");
}
HDEVINFO deviceInfoSet = WINENV.SetupDiCreateDeviceInfoList(&classGuid,(HWND)0);
if (deviceInfoSet == INVALID_HANDLE_VALUE) {
return std::string("SetupDiCreateDeviceInfoList() failed");
}
SP_DEVINFO_DATA deviceInfoData;
memset(&deviceInfoData,0,sizeof(deviceInfoData));
deviceInfoData.cbSize = sizeof(deviceInfoData);
if (!WINENV.SetupDiCreateDeviceInfoA(deviceInfoSet,className,&classGuid,(PCSTR)0,(HWND)0,DICD_GENERATE_ID,&deviceInfoData)) {
WINENV.SetupDiDestroyDeviceInfoList(deviceInfoSet);
return std::string("SetupDiCreateDeviceInfoA() failed");
}
if (!WINENV.SetupDiSetDeviceRegistryPropertyA(deviceInfoSet,&deviceInfoData,SPDRP_HARDWAREID,(const BYTE *)WINENV.tapDriverName.c_str(),(DWORD)(WINENV.tapDriverName.length() + 1))) {
WINENV.SetupDiDestroyDeviceInfoList(deviceInfoSet);
return std::string("SetupDiSetDeviceRegistryPropertyA() failed");
}
if (!WINENV.SetupDiCallClassInstaller(DIF_REGISTERDEVICE,deviceInfoSet,&deviceInfoData)) {
WINENV.SetupDiDestroyDeviceInfoList(deviceInfoSet);
return std::string("SetupDiCallClassInstaller(DIF_REGISTERDEVICE) failed");
}
// HACK: During upgrades, this can fail while the installer is still running. So make 60 attempts
// with a 1s delay between each attempt.
bool driverInstalled = false;
for(int retryCounter=0;retryCounter<60;++retryCounter) {
BOOL rebootRequired = FALSE;
if (WINENV.UpdateDriverForPlugAndPlayDevicesA((HWND)0,WINENV.tapDriverName.c_str(),pathToInf,INSTALLFLAG_FORCE|INSTALLFLAG_NONINTERACTIVE,&rebootRequired)) {
driverInstalled = true;
break;
} else Sleep(1000);
}
if (!driverInstalled) {
WINENV.SetupDiDestroyDeviceInfoList(deviceInfoSet);
return std::string("UpdateDriverForPlugAndPlayDevices() failed (made 60 attempts)");
}
char iidbuf[1024];
DWORD iidReqSize = sizeof(iidbuf);
if (WINENV.SetupDiGetDeviceInstanceIdA(deviceInfoSet,&deviceInfoData,iidbuf,sizeof(iidbuf),&iidReqSize)) {
deviceInstanceId = iidbuf;
} // failure here is not fatal since we only need this on Vista and 2008 -- other versions fill it into the registry automatically
WINENV.SetupDiDestroyDeviceInfoList(deviceInfoSet);
return std::string();
}
std::string WindowsEthernetTap::destroyAllLegacyPersistentTapDevices()
{
char subkeyName[1024];
char subkeyClass[1024];
char data[1024];
std::set<std::string> instanceIdPathsToRemove;
{
HKEY nwAdapters;
if (RegOpenKeyExA(HKEY_LOCAL_MACHINE,"SYSTEM\\CurrentControlSet\\Control\\Class\\{4D36E972-E325-11CE-BFC1-08002BE10318}",0,KEY_READ|KEY_WRITE,&nwAdapters) != ERROR_SUCCESS)
return std::string("Could not open registry key");
for(DWORD subkeyIndex=0;;++subkeyIndex) {
DWORD type;
DWORD dataLen;
DWORD subkeyNameLen = sizeof(subkeyName);
DWORD subkeyClassLen = sizeof(subkeyClass);
FILETIME lastWriteTime;
if (RegEnumKeyExA(nwAdapters,subkeyIndex,subkeyName,&subkeyNameLen,(DWORD *)0,subkeyClass,&subkeyClassLen,&lastWriteTime) == ERROR_SUCCESS) {
type = 0;
dataLen = sizeof(data);
if (RegGetValueA(nwAdapters,subkeyName,"ComponentId",RRF_RT_ANY,&type,(PVOID)data,&dataLen) == ERROR_SUCCESS) {
data[dataLen] = '\0';
if ((!strnicmp(data,"zttap",5))&&(WINENV.tapDriverName != data)) {
std::string instanceIdPath;
type = 0;
dataLen = sizeof(data);
if (RegGetValueA(nwAdapters,subkeyName,"DeviceInstanceID",RRF_RT_ANY,&type,(PVOID)data,&dataLen) == ERROR_SUCCESS)
instanceIdPath.assign(data,dataLen);
if (instanceIdPath.length() != 0)
instanceIdPathsToRemove.insert(instanceIdPath);
}
}
} else break; // end of list or failure
}
RegCloseKey(nwAdapters);
}
std::string errlist;
for(std::set<std::string>::iterator iidp(instanceIdPathsToRemove.begin());iidp!=instanceIdPathsToRemove.end();++iidp) {
std::string err = deletePersistentTapDevice(iidp->c_str());
if (err.length() > 0) {
if (errlist.length() > 0)
errlist.push_back(',');
errlist.append(err);
}
}
return errlist;
}
std::string WindowsEthernetTap::destroyAllPersistentTapDevices()
{
char subkeyName[1024];
char subkeyClass[1024];
char data[1024];
std::set<std::string> instanceIdPathsToRemove;
{
HKEY nwAdapters;
if (RegOpenKeyExA(HKEY_LOCAL_MACHINE,"SYSTEM\\CurrentControlSet\\Control\\Class\\{4D36E972-E325-11CE-BFC1-08002BE10318}",0,KEY_READ|KEY_WRITE,&nwAdapters) != ERROR_SUCCESS)
return std::string("Could not open registry key");
for(DWORD subkeyIndex=0;;++subkeyIndex) {
DWORD type;
DWORD dataLen;
DWORD subkeyNameLen = sizeof(subkeyName);
DWORD subkeyClassLen = sizeof(subkeyClass);
FILETIME lastWriteTime;
if (RegEnumKeyExA(nwAdapters,subkeyIndex,subkeyName,&subkeyNameLen,(DWORD *)0,subkeyClass,&subkeyClassLen,&lastWriteTime) == ERROR_SUCCESS) {
type = 0;
dataLen = sizeof(data);
if (RegGetValueA(nwAdapters,subkeyName,"ComponentId",RRF_RT_ANY,&type,(PVOID)data,&dataLen) == ERROR_SUCCESS) {
data[dataLen] = '\0';
if (!strnicmp(data,"zttap",5)) {
std::string instanceIdPath;
type = 0;
dataLen = sizeof(data);
if (RegGetValueA(nwAdapters,subkeyName,"DeviceInstanceID",RRF_RT_ANY,&type,(PVOID)data,&dataLen) == ERROR_SUCCESS)
instanceIdPath.assign(data,dataLen);
if (instanceIdPath.length() != 0)
instanceIdPathsToRemove.insert(instanceIdPath);
}
}
} else break; // end of list or failure
}
RegCloseKey(nwAdapters);
}
std::string errlist;
for(std::set<std::string>::iterator iidp(instanceIdPathsToRemove.begin());iidp!=instanceIdPathsToRemove.end();++iidp) {
std::string err = deletePersistentTapDevice(iidp->c_str());
if (err.length() > 0) {
if (errlist.length() > 0)
errlist.push_back(',');
errlist.append(err);
}
}
return errlist;
}
std::string WindowsEthernetTap::deletePersistentTapDevice(const char *instanceId)
{
char iid[256];
SP_REMOVEDEVICE_PARAMS rmdParams;
memset(&rmdParams,0,sizeof(rmdParams));
rmdParams.ClassInstallHeader.cbSize = sizeof(SP_CLASSINSTALL_HEADER);
rmdParams.ClassInstallHeader.InstallFunction = DIF_REMOVE;
rmdParams.Scope = DI_REMOVEDEVICE_GLOBAL;
rmdParams.HwProfile = 0;
Mutex::Lock _l(_systemDeviceManagementLock);
HDEVINFO devInfo = WINENV.SetupDiGetClassDevsExA((const GUID *)0,(PCSTR)0,(HWND)0,DIGCF_ALLCLASSES,(HDEVINFO)0,(PCSTR)0,(PVOID)0);
if (devInfo == INVALID_HANDLE_VALUE)
return std::string("SetupDiGetClassDevsExA() failed");
WINENV.SetupDiOpenDeviceInfoA(devInfo,instanceId,(HWND)0,0,(PSP_DEVINFO_DATA)0);
SP_DEVINFO_DATA devInfoData;
memset(&devInfoData,0,sizeof(devInfoData));
devInfoData.cbSize = sizeof(devInfoData);
for(DWORD devIndex=0;WINENV.SetupDiEnumDeviceInfo(devInfo,devIndex,&devInfoData);devIndex++) {
if ((WINENV.CM_Get_Device_ID_ExA(devInfoData.DevInst,iid,sizeof(iid),0,(HMACHINE)0) == CR_SUCCESS)&&(!strcmp(iid,instanceId))) {
if (!WINENV.SetupDiSetClassInstallParamsA(devInfo,&devInfoData,&rmdParams.ClassInstallHeader,sizeof(rmdParams))) {
WINENV.SetupDiDestroyDeviceInfoList(devInfo);
return std::string("SetupDiSetClassInstallParams() failed");
}
if (!WINENV.SetupDiCallClassInstaller(DIF_REMOVE,devInfo,&devInfoData)) {
WINENV.SetupDiDestroyDeviceInfoList(devInfo);
return std::string("SetupDiCallClassInstaller(DIF_REMOVE) failed");
}
WINENV.SetupDiDestroyDeviceInfoList(devInfo);
return std::string();
}
}
WINENV.SetupDiDestroyDeviceInfoList(devInfo);
return std::string("instance ID not found");
}
bool WindowsEthernetTap::setPersistentTapDeviceState(const char *instanceId,bool enabled)
{
char iid[256];
SP_PROPCHANGE_PARAMS params;
Mutex::Lock _l(_systemDeviceManagementLock);
HDEVINFO devInfo = WINENV.SetupDiGetClassDevsExA((const GUID *)0,(PCSTR)0,(HWND)0,DIGCF_ALLCLASSES,(HDEVINFO)0,(PCSTR)0,(PVOID)0);
if (devInfo == INVALID_HANDLE_VALUE)
return false;
WINENV.SetupDiOpenDeviceInfoA(devInfo,instanceId,(HWND)0,0,(PSP_DEVINFO_DATA)0);
SP_DEVINFO_DATA devInfoData;
memset(&devInfoData,0,sizeof(devInfoData));
devInfoData.cbSize = sizeof(devInfoData);
for(DWORD devIndex=0;WINENV.SetupDiEnumDeviceInfo(devInfo,devIndex,&devInfoData);devIndex++) {
if ((WINENV.CM_Get_Device_ID_ExA(devInfoData.DevInst,iid,sizeof(iid),0,(HMACHINE)0) == CR_SUCCESS)&&(!strcmp(iid,instanceId))) {
memset(&params,0,sizeof(params));
params.ClassInstallHeader.cbSize = sizeof(SP_CLASSINSTALL_HEADER);
params.ClassInstallHeader.InstallFunction = DIF_PROPERTYCHANGE;
params.StateChange = enabled ? DICS_ENABLE : DICS_DISABLE;
params.Scope = DICS_FLAG_GLOBAL;
params.HwProfile = 0;
WINENV.SetupDiSetClassInstallParamsA(devInfo,&devInfoData,&params.ClassInstallHeader,sizeof(params));
WINENV.SetupDiCallClassInstaller(DIF_PROPERTYCHANGE,devInfo,&devInfoData);
memset(&params,0,sizeof(params));
params.ClassInstallHeader.cbSize = sizeof(SP_CLASSINSTALL_HEADER);
params.ClassInstallHeader.InstallFunction = DIF_PROPERTYCHANGE;
params.StateChange = enabled ? DICS_ENABLE : DICS_DISABLE;
params.Scope = DICS_FLAG_CONFIGSPECIFIC;
params.HwProfile = 0;
WINENV.SetupDiSetClassInstallParamsA(devInfo,&devInfoData,&params.ClassInstallHeader,sizeof(params));
WINENV.SetupDiCallClassInstaller(DIF_PROPERTYCHANGE,devInfo,&devInfoData);
WINENV.SetupDiDestroyDeviceInfoList(devInfo);
return true;
}
}
WINENV.SetupDiDestroyDeviceInfoList(devInfo);
return false;
}
WindowsEthernetTap::WindowsEthernetTap(
const char *hp,
const MAC &mac,
unsigned int mtu,
unsigned int metric,
uint64_t nwid,
const char *friendlyName,
void (*handler)(void *,void *,uint64_t,const MAC &,const MAC &,unsigned int,unsigned int,const void *,unsigned int),
void *arg) :
_handler(handler),
_arg(arg),
_mac(mac),
_nwid(nwid),
_mtu(mtu),
_tap(INVALID_HANDLE_VALUE),
_friendlyName(friendlyName),
_injectSemaphore(INVALID_HANDLE_VALUE),
_pathToHelpers(hp),
_run(true),
_initialized(false),
_enabled(true),
_lastIfAddrsUpdate(0)
{
char subkeyName[1024];
char subkeyClass[1024];
char data[1024];
char tag[24];
// We "tag" registry entries with the network ID to identify persistent devices
OSUtils::ztsnprintf(tag,sizeof(tag),"%.16llx",(unsigned long long)nwid);
Mutex::Lock _l(_systemTapInitLock);
HKEY nwAdapters;
if (RegOpenKeyExA(HKEY_LOCAL_MACHINE,"SYSTEM\\CurrentControlSet\\Control\\Class\\{4D36E972-E325-11CE-BFC1-08002BE10318}",0,KEY_READ|KEY_WRITE,&nwAdapters) != ERROR_SUCCESS)
throw std::runtime_error("unable to open registry key for network adapter enumeration");
// Look for the tap instance that corresponds with this network
for(DWORD subkeyIndex=0;;++subkeyIndex) {
DWORD type;
DWORD dataLen;
DWORD subkeyNameLen = sizeof(subkeyName);
DWORD subkeyClassLen = sizeof(subkeyClass);
FILETIME lastWriteTime;
if (RegEnumKeyExA(nwAdapters,subkeyIndex,subkeyName,&subkeyNameLen,(DWORD *)0,subkeyClass,&subkeyClassLen,&lastWriteTime) == ERROR_SUCCESS) {
type = 0;
dataLen = sizeof(data);
if (RegGetValueA(nwAdapters,subkeyName,"ComponentId",RRF_RT_ANY,&type,(PVOID)data,&dataLen) == ERROR_SUCCESS) {
data[dataLen] = (char)0;
if (WINENV.tapDriverName == data) {
std::string instanceId;
type = 0;
dataLen = sizeof(data);
if (RegGetValueA(nwAdapters,subkeyName,"NetCfgInstanceId",RRF_RT_ANY,&type,(PVOID)data,&dataLen) == ERROR_SUCCESS)
instanceId.assign(data,dataLen);
std::string instanceIdPath;
type = 0;
dataLen = sizeof(data);
if (RegGetValueA(nwAdapters,subkeyName,"DeviceInstanceID",RRF_RT_ANY,&type,(PVOID)data,&dataLen) == ERROR_SUCCESS)
instanceIdPath.assign(data,dataLen);
if ((_netCfgInstanceId.length() == 0)&&(instanceId.length() != 0)&&(instanceIdPath.length() != 0)) {
type = 0;
dataLen = sizeof(data);
if (RegGetValueA(nwAdapters,subkeyName,"_ZeroTierTapIdentifier",RRF_RT_ANY,&type,(PVOID)data,&dataLen) == ERROR_SUCCESS) {
data[dataLen] = '\0';
if (!strcmp(data,tag)) {
_netCfgInstanceId = instanceId;
_deviceInstanceId = instanceIdPath;
_mySubkeyName = subkeyName;
break; // found it!
}
}
}
}
}
} else break; // no more subkeys or error occurred enumerating them
}
// If there is no device, try to create one
bool creatingNewDevice = (_netCfgInstanceId.length() == 0);
std::string newDeviceInstanceId;
if (creatingNewDevice) {
for(int getNewAttemptCounter=0;getNewAttemptCounter<2;++getNewAttemptCounter) {
for(DWORD subkeyIndex=0;;++subkeyIndex) {
DWORD type;
DWORD dataLen;
DWORD subkeyNameLen = sizeof(subkeyName);
DWORD subkeyClassLen = sizeof(subkeyClass);
FILETIME lastWriteTime;
if (RegEnumKeyExA(nwAdapters,subkeyIndex,subkeyName,&subkeyNameLen,(DWORD *)0,subkeyClass,&subkeyClassLen,&lastWriteTime) == ERROR_SUCCESS) {
type = 0;
dataLen = sizeof(data);
if (RegGetValueA(nwAdapters,subkeyName,"ComponentId",RRF_RT_ANY,&type,(PVOID)data,&dataLen) == ERROR_SUCCESS) {
data[dataLen] = '\0';
if (WINENV.tapDriverName == data) {
type = 0;
dataLen = sizeof(data);
if ((RegGetValueA(nwAdapters,subkeyName,"_ZeroTierTapIdentifier",RRF_RT_ANY,&type,(PVOID)data,&dataLen) != ERROR_SUCCESS)||(dataLen <= 0)) {
type = 0;
dataLen = sizeof(data);
if (RegGetValueA(nwAdapters,subkeyName,"NetCfgInstanceId",RRF_RT_ANY,&type,(PVOID)data,&dataLen) == ERROR_SUCCESS) {
RegSetKeyValueA(nwAdapters,subkeyName,"_ZeroTierTapIdentifier",REG_SZ,tag,(DWORD)(strlen(tag)+1));
_netCfgInstanceId.assign(data,dataLen);
type = 0;
dataLen = sizeof(data);
if (RegGetValueA(nwAdapters,subkeyName,"DeviceInstanceID",RRF_RT_ANY,&type,(PVOID)data,&dataLen) == ERROR_SUCCESS)
_deviceInstanceId.assign(data,dataLen);
_mySubkeyName = subkeyName;
// Disable DHCP by default on new devices
HKEY tcpIpInterfaces;
if (RegOpenKeyExA(HKEY_LOCAL_MACHINE,"SYSTEM\\CurrentControlSet\\services\\Tcpip\\Parameters\\Interfaces",0,KEY_READ|KEY_WRITE,&tcpIpInterfaces) == ERROR_SUCCESS) {
DWORD enable = 0;
RegSetKeyValueA(tcpIpInterfaces,_netCfgInstanceId.c_str(),"EnableDHCP",REG_DWORD,&enable,sizeof(enable));
RegCloseKey(tcpIpInterfaces);
}
break; // found an unused zttap device
}
}
}
}
} else break; // no more keys or error occurred
}
if (_netCfgInstanceId.length() > 0) {
break; // found an unused zttap device
} else {
// no unused zttap devices, so create one
std::string errm = addNewPersistentTapDevice((std::string(_pathToHelpers) + WINENV.tapDriverPath).c_str(),newDeviceInstanceId);
if (errm.length() > 0)
throw std::runtime_error(std::string("unable to create new device instance: ")+errm);
}
}
}
if (_netCfgInstanceId.length() > 0) {
char tmps[64];
unsigned int tmpsl = OSUtils::ztsnprintf(tmps,sizeof(tmps),"%.2X-%.2X-%.2X-%.2X-%.2X-%.2X",(unsigned int)mac[0],(unsigned int)mac[1],(unsigned int)mac[2],(unsigned int)mac[3],(unsigned int)mac[4],(unsigned int)mac[5]) + 1;
RegSetKeyValueA(nwAdapters,_mySubkeyName.c_str(),"NetworkAddress",REG_SZ,tmps,tmpsl);
RegSetKeyValueA(nwAdapters,_mySubkeyName.c_str(),"MAC",REG_SZ,tmps,tmpsl);
tmpsl = OSUtils::ztsnprintf(tmps, sizeof(tmps), "%d", mtu);
RegSetKeyValueA(nwAdapters,_mySubkeyName.c_str(),"MTU",REG_SZ,tmps,tmpsl);
DWORD tmp = 0;
RegSetKeyValueA(nwAdapters,_mySubkeyName.c_str(),"*NdisDeviceType",REG_DWORD,(LPCVOID)&tmp,sizeof(tmp));
tmp = IF_TYPE_ETHERNET_CSMACD;
RegSetKeyValueA(nwAdapters,_mySubkeyName.c_str(),"*IfType",REG_DWORD,(LPCVOID)&tmp,sizeof(tmp));
if (creatingNewDevice) {
// Vista/2008 does not set this
if (newDeviceInstanceId.length() > 0)
RegSetKeyValueA(nwAdapters,_mySubkeyName.c_str(),"DeviceInstanceID",REG_SZ,newDeviceInstanceId.c_str(),(DWORD)newDeviceInstanceId.length());
// Set EnableDHCP to 0 by default on new devices
tmp = 0;
RegSetKeyValueA(nwAdapters,_mySubkeyName.c_str(),"EnableDHCP",REG_DWORD,(LPCVOID)&tmp,sizeof(tmp));
}
RegCloseKey(nwAdapters);
} else {
RegCloseKey(nwAdapters);
throw std::runtime_error("unable to find or create tap adapter");
}
{
char nobraces[128]; // strip braces from GUID before converting it, because Windows
const char *nbtmp1 = _netCfgInstanceId.c_str();
char *nbtmp2 = nobraces;
while (*nbtmp1) {
if ((*nbtmp1 != '{')&&(*nbtmp1 != '}'))
*nbtmp2++ = *nbtmp1;
++nbtmp1;
}
*nbtmp2 = (char)0;
if (UuidFromStringA((RPC_CSTR)nobraces,&_deviceGuid) != RPC_S_OK)
throw std::runtime_error("unable to convert instance ID GUID to native GUID (invalid NetCfgInstanceId in registry?)");
}
// Get the LUID, which is one of like four fucking ways to refer to a network device in Windows
if (ConvertInterfaceGuidToLuid(&_deviceGuid,&_deviceLuid) != NO_ERROR)
throw std::runtime_error("unable to convert device interface GUID to LUID");
//_initialized = true;
if (friendlyName)
setFriendlyName(friendlyName);
_injectSemaphore = CreateSemaphore(NULL,0,1,NULL);
_thread = Thread::start(this);
}
WindowsEthernetTap::~WindowsEthernetTap()
{
WinDNSHelper::removeDNS(_nwid);
_run = false;
ReleaseSemaphore(_injectSemaphore,1,NULL);
Thread::join(_thread);
CloseHandle(_injectSemaphore);
setPersistentTapDeviceState(_deviceInstanceId.c_str(),false);
}
void WindowsEthernetTap::setEnabled(bool en)
{
_enabled = en;
}
bool WindowsEthernetTap::enabled() const
{
return _enabled;
}
bool WindowsEthernetTap::addIp(const InetAddress &ip)
{
if (!ip.netmaskBits()) // sanity check... netmask of 0.0.0.0 is WUT?
return false;
Mutex::Lock _l(_assignedIps_m);
if (std::find(_assignedIps.begin(),_assignedIps.end(),ip) != _assignedIps.end())
return true;
_assignedIps.push_back(ip);
_syncIps();
return true;
}
bool WindowsEthernetTap::removeIp(const InetAddress &ip)
{
if (ip.isV6())
return true;
{
Mutex::Lock _l(_assignedIps_m);
std::vector<InetAddress>::iterator aip(std::find(_assignedIps.begin(),_assignedIps.end(),ip));
if (aip != _assignedIps.end())
_assignedIps.erase(aip);
}
if (!_initialized)
return false;
try {
MIB_UNICASTIPADDRESS_TABLE *ipt = (MIB_UNICASTIPADDRESS_TABLE *)0;
if (GetUnicastIpAddressTable(AF_UNSPEC,&ipt) == NO_ERROR) {
if ((ipt)&&(ipt->NumEntries > 0)) {
for(DWORD i=0;i<(DWORD)ipt->NumEntries;++i) {
if (ipt->Table[i].InterfaceLuid.Value == _deviceLuid.Value) {
InetAddress addr;
switch(ipt->Table[i].Address.si_family) {
case AF_INET:
addr.set(&(ipt->Table[i].Address.Ipv4.sin_addr.S_un.S_addr),4,ipt->Table[i].OnLinkPrefixLength);
break;
case AF_INET6:
addr.set(ipt->Table[i].Address.Ipv6.sin6_addr.u.Byte,16,ipt->Table[i].OnLinkPrefixLength);
if (addr.ipScope() == InetAddress::IP_SCOPE_LINK_LOCAL)
continue; // can't remove link-local IPv6 addresses
break;
}
if (addr == ip) {
DeleteUnicastIpAddressEntry(&(ipt->Table[i]));
FreeMibTable(ipt);
if (ip.isV4()) {
std::vector<std::string> regIps(_getRegistryIPv4Value("IPAddress"));
std::vector<std::string> regSubnetMasks(_getRegistryIPv4Value("SubnetMask"));
char ipbuf[64];
std::string ipstr(ip.toIpString(ipbuf));
for (std::vector<std::string>::iterator rip(regIps.begin()), rm(regSubnetMasks.begin()); ((rip != regIps.end()) && (rm != regSubnetMasks.end())); ++rip, ++rm) {
if (*rip == ipstr) {
regIps.erase(rip);
regSubnetMasks.erase(rm);
_setRegistryIPv4Value("IPAddress", regIps);
_setRegistryIPv4Value("SubnetMask", regSubnetMasks);
break;
}
}
}
return true;
}
}
}
}
FreeMibTable((PVOID)ipt);
}
} catch ( ... ) {}
return false;
}
std::vector<InetAddress> WindowsEthernetTap::ips() const
{
static const InetAddress linkLocalLoopback("fe80::1/64"); // what is this and why does Windows assign it?
std::vector<InetAddress> addrs;
if (!_initialized)
return addrs;
uint64_t now = OSUtils::now();
if ((now - _lastIfAddrsUpdate) <= GETIFADDRS_CACHE_TIME) {
return _ifaddrs;
}
_lastIfAddrsUpdate = now;
try {
MIB_UNICASTIPADDRESS_TABLE *ipt = (MIB_UNICASTIPADDRESS_TABLE *)0;
if (GetUnicastIpAddressTable(AF_UNSPEC,&ipt) == NO_ERROR) {
if ((ipt)&&(ipt->NumEntries > 0)) {
for(DWORD i=0;i<(DWORD)ipt->NumEntries;++i) {
if (ipt->Table[i].InterfaceLuid.Value == _deviceLuid.Value) {
switch(ipt->Table[i].Address.si_family) {
case AF_INET: {
InetAddress ip(&(ipt->Table[i].Address.Ipv4.sin_addr.S_un.S_addr),4,ipt->Table[i].OnLinkPrefixLength);
if (ip != InetAddress::LO4)
addrs.push_back(ip);
} break;
case AF_INET6: {
InetAddress ip(ipt->Table[i].Address.Ipv6.sin6_addr.u.Byte,16,ipt->Table[i].OnLinkPrefixLength);
if ((ip != linkLocalLoopback)&&(ip != InetAddress::LO6))
addrs.push_back(ip);
} break;
}
}
}
}
FreeMibTable(ipt);
}
} catch ( ... ) {} // sanity check, shouldn't happen unless out of memory
std::sort(addrs.begin(),addrs.end());
addrs.erase(std::unique(addrs.begin(),addrs.end()),addrs.end());
_ifaddrs = addrs;
return addrs;
}
void WindowsEthernetTap::put(const MAC &from,const MAC &to,unsigned int etherType,const void *data,unsigned int len)
{
if ((!_initialized)||(!_enabled)||(_tap == INVALID_HANDLE_VALUE)||(len > _mtu))
return;
Mutex::Lock _l(_injectPending_m);
_injectPending.emplace();
_injectPending.back().len = len + 14;
char *const d = _injectPending.back().data;
to.copyTo(d,6);
from.copyTo(d + 6,6);
d[12] = (char)((etherType >> 8) & 0xff);
d[13] = (char)(etherType & 0xff);
memcpy(d + 14,data,len);
ReleaseSemaphore(_injectSemaphore,1,NULL);
}
std::string WindowsEthernetTap::deviceName() const
{
char tmp[1024];
if (ConvertInterfaceLuidToNameA(&_deviceLuid,tmp,sizeof(tmp)) != NO_ERROR)
return std::string("[ConvertInterfaceLuidToName() failed]");
return std::string(tmp);
}
void WindowsEthernetTap::setFriendlyName(const char *dn)
{
if (!_initialized)
return;
HKEY ifp;
if (RegOpenKeyExA(HKEY_LOCAL_MACHINE,(std::string("SYSTEM\\CurrentControlSet\\Control\\Network\\{4D36E972-E325-11CE-BFC1-08002BE10318}\\") + _netCfgInstanceId).c_str(),0,KEY_READ|KEY_WRITE,&ifp) == ERROR_SUCCESS) {
RegSetKeyValueA(ifp,"Connection","Name",REG_SZ,(LPCVOID)dn,(DWORD)(strlen(dn)+1));
RegCloseKey(ifp);
}
HRESULT hr = S_OK;
INetSharingManager *nsm;
hr = CoCreateInstance(__uuidof(NetSharingManager), NULL, CLSCTX_ALL, __uuidof(INetSharingManager), (void**)&nsm);
if (hr != S_OK) return;
bool found = false;
INetSharingEveryConnectionCollection *nsecc = nullptr;
hr = nsm->get_EnumEveryConnection(&nsecc);
if (!nsecc) {
fprintf(stderr, "Failed to get NSM connections");
return;
}
IEnumVARIANT *ev = nullptr;
IUnknown *unk = nullptr;
hr = nsecc->get__NewEnum(&unk);
if (unk) {
hr = unk->QueryInterface(__uuidof(IEnumVARIANT), (void**)&ev);
unk->Release();
}
if (ev) {
VARIANT v;
VariantInit(&v);
while ((S_OK == ev->Next(1, &v, NULL)) && found == FALSE) {
if (V_VT(&v) == VT_UNKNOWN) {
INetConnection *nc = nullptr;
V_UNKNOWN(&v)->QueryInterface(__uuidof(INetConnection), (void**)&nc);
if (nc) {
NETCON_PROPERTIES *ncp = nullptr;
nc->GetProperties(&ncp);
if (ncp != nullptr) {
GUID curId = ncp->guidId;
if (curId == _deviceGuid) {
wchar_t wtext[255];
mbstowcs(wtext, dn, strlen(dn)+1);
nc->Rename(wtext);
found = true;
}
}
nc->Release();
}
}
VariantClear(&v);
}
ev->Release();
}
nsecc->Release();
_friendlyName_m.lock();
_friendlyName = dn;
_friendlyName_m.unlock();
}
std::string WindowsEthernetTap::friendlyName() const
{
Mutex::Lock l(_friendlyName_m);
return _friendlyName;
}
void WindowsEthernetTap::scanMulticastGroups(std::vector<MulticastGroup> &added,std::vector<MulticastGroup> &removed)
{
if (!_initialized)
return;
HANDLE t = _tap;
if (t == INVALID_HANDLE_VALUE)
return;
std::vector<MulticastGroup> newGroups;
// The ZT1 tap driver supports an IOCTL to get multicast memberships at the L2
// level... something Windows does not seem to expose ordinarily. This lets
// pretty much anything work... IPv4, IPv6, IPX, oldskool Netbios, who knows...
unsigned char mcastbuf[TAP_WIN_IOCTL_GET_MULTICAST_MEMBERSHIPS_OUTPUT_BUF_SIZE];
DWORD bytesReturned = 0;
if (DeviceIoControl(t,TAP_WIN_IOCTL_GET_MULTICAST_MEMBERSHIPS,(LPVOID)mcastbuf,sizeof(mcastbuf),(LPVOID)mcastbuf,sizeof(mcastbuf),&bytesReturned,NULL)) {
if ((bytesReturned > 0)&&(bytesReturned <= TAP_WIN_IOCTL_GET_MULTICAST_MEMBERSHIPS_OUTPUT_BUF_SIZE)) { // sanity check
MAC mac;
DWORD i = 0;
while ((i + 6) <= bytesReturned) {
mac.setTo(mcastbuf + i,6);
i += 6;
if ((mac.isMulticast())&&(!mac.isBroadcast())) {
// exclude the nulls that may be returned or any other junk Windows puts in there
newGroups.push_back(MulticastGroup(mac,0));
}
}
}
}
std::vector<InetAddress> allIps(ips());
for(std::vector<InetAddress>::iterator ip(allIps.begin());ip!=allIps.end();++ip)
newGroups.push_back(MulticastGroup::deriveMulticastGroupForAddressResolution(*ip));
std::sort(newGroups.begin(),newGroups.end());
newGroups.erase(std::unique(newGroups.begin(),newGroups.end()),newGroups.end());
for(std::vector<MulticastGroup>::iterator m(newGroups.begin());m!=newGroups.end();++m) {
if (!std::binary_search(_multicastGroups.begin(),_multicastGroups.end(),*m))
added.push_back(*m);
}
for(std::vector<MulticastGroup>::iterator m(_multicastGroups.begin());m!=_multicastGroups.end();++m) {
if (!std::binary_search(newGroups.begin(),newGroups.end(),*m))
removed.push_back(*m);
}
_multicastGroups.swap(newGroups);
}
void WindowsEthernetTap::setMtu(unsigned int mtu)
{
if (mtu != _mtu) {
_mtu = mtu;
HKEY nwAdapters;
if (RegOpenKeyExA(HKEY_LOCAL_MACHINE, "SYSTEM\\CurrentControlSet\\Control\\Class\\{4D36E972-E325-11CE-BFC1-08002BE10318}", 0, KEY_READ | KEY_WRITE, &nwAdapters) == ERROR_SUCCESS) {
char tmps[64];
unsigned int tmpsl = OSUtils::ztsnprintf(tmps, sizeof(tmps), "%d", mtu);
RegSetKeyValueA(nwAdapters, _mySubkeyName.c_str(), "MTU", REG_SZ, tmps, tmpsl);
RegCloseKey(nwAdapters);
}
}
}
NET_IFINDEX WindowsEthernetTap::interfaceIndex() const
{
NET_IFINDEX idx = -1;
if (ConvertInterfaceLuidToIndex(&_deviceLuid,&idx) == NO_ERROR)
return idx;
return -1;
}
void WindowsEthernetTap::threadMain()
throw()
{
HRESULT hres = CoInitializeEx(0, COINIT_MULTITHREADED);
if (FAILED(hres)) {
fprintf(stderr, "WinEthernetTap: COM initialization failed");
return;
}
char tapReadBuf[ZT_MAX_MTU + 32];
char tapPath[128];
HANDLE wait4[3];
OVERLAPPED tapOvlRead,tapOvlWrite;
OSUtils::ztsnprintf(tapPath,sizeof(tapPath),"\\\\.\\Global\\%s.tap",_netCfgInstanceId.c_str());
try {
while (_run) {
// Because Windows
Sleep(250);
setPersistentTapDeviceState(_deviceInstanceId.c_str(),false);
Sleep(250);
setPersistentTapDeviceState(_deviceInstanceId.c_str(),true);
Sleep(250);
setPersistentTapDeviceState(_deviceInstanceId.c_str(),false);
Sleep(250);
setPersistentTapDeviceState(_deviceInstanceId.c_str(),true);
Sleep(250);
_tap = CreateFileA(tapPath,GENERIC_READ|GENERIC_WRITE,0,NULL,OPEN_EXISTING,FILE_ATTRIBUTE_SYSTEM|FILE_FLAG_OVERLAPPED,NULL);
if (_tap == INVALID_HANDLE_VALUE) {
Sleep(250);
continue;
}
{
uint32_t tmpi = 1;
DWORD bytesReturned = 0;
DeviceIoControl(_tap,TAP_WIN_IOCTL_SET_MEDIA_STATUS,&tmpi,sizeof(tmpi),&tmpi,sizeof(tmpi),&bytesReturned,NULL);
}
#ifdef ZT_WINDOWS_CREATE_FAKE_DEFAULT_ROUTE
{
/* This inserts a fake default route and a fake ARP entry, forcing
* Windows to detect this as a "real" network and apply proper
* firewall rules.
*
* This hack is completely stupid, but Windows made me do it
* by being broken and insane.
*
* Background: Windows tries to detect its network location by
* matching it to the ARP address of the default route. Networks
* without default routes are "unidentified networks" and cannot
* have their firewall classification changed by the user (easily).
*
* Yes, you read that right.
*
* The common workaround is to set *NdisDeviceType to 1, which
* totally disables all Windows firewall functionality. This is
* the answer you'll find on most forums for things like OpenVPN.
*
* Yes, you read that right.
*
* The default route workaround is also known, but for this to
* work there must be a known default IP that resolves to a known
* ARP address. This works for an OpenVPN tunnel, but not here
* because this isn't a tunnel. It's a mesh. There is no "other
* end," or any other known always on IP.
*
* So let's make a fake one and shove it in there along with its
* fake static ARP entry. Also makes it instant-on and static.
*
* We'll have to see what DHCP does with this. In the future we
* probably will not want to do this on DHCP-enabled networks, so
* when we enable DHCP we will go in and yank this wacko hacko from
* the routing table before doing so.
*
* Like Jesse Pinkman would say: "YEEEEAAH BITCH!" */
const uint32_t fakeIp = htonl(0x19fffffe); // 25.255.255.254 -- unrouted IPv4 block
for(int i=0;i<8;++i) {
MIB_IPNET_ROW2 ipnr;
memset(&ipnr,0,sizeof(ipnr));
ipnr.Address.si_family = AF_INET;
ipnr.Address.Ipv4.sin_addr.s_addr = fakeIp;
ipnr.InterfaceLuid.Value = _deviceLuid.Value;
ipnr.PhysicalAddress[0] = _mac[0] ^ 0x10; // just make something up that's consistent and not part of this net
ipnr.PhysicalAddress[1] = 0x00;
ipnr.PhysicalAddress[2] = (UCHAR)((_deviceGuid.Data1 >> 24) & 0xff);
ipnr.PhysicalAddress[3] = (UCHAR)((_deviceGuid.Data1 >> 16) & 0xff);
ipnr.PhysicalAddress[4] = (UCHAR)((_deviceGuid.Data1 >> 8) & 0xff);
ipnr.PhysicalAddress[5] = (UCHAR)(_deviceGuid.Data1 & 0xff);
ipnr.PhysicalAddressLength = 6;
ipnr.State = NlnsPermanent;
ipnr.IsRouter = 1;
ipnr.IsUnreachable = 0;
ipnr.ReachabilityTime.LastReachable = 0x0fffffff;
ipnr.ReachabilityTime.LastUnreachable = 1;
DWORD result = CreateIpNetEntry2(&ipnr);
if (result != NO_ERROR)
Sleep(250);
else break;
}
for(int i=0;i<8;++i) {
MIB_IPFORWARD_ROW2 nr;
memset(&nr,0,sizeof(nr));
InitializeIpForwardEntry(&nr);
nr.InterfaceLuid.Value = _deviceLuid.Value;
nr.DestinationPrefix.Prefix.si_family = AF_INET; // rest is left as 0.0.0.0/0
nr.NextHop.si_family = AF_INET;
nr.NextHop.Ipv4.sin_addr.s_addr = fakeIp;
nr.Metric = 9999; // do not use as real default route
nr.Protocol = MIB_IPPROTO_NETMGMT;
DWORD result = CreateIpForwardEntry2(&nr);
if (result != NO_ERROR)
Sleep(250);
else break;
}
}
#endif
// Assign or re-assign any should-be-assigned IPs in case we have restarted
{
Mutex::Lock _l(_assignedIps_m);
_syncIps();
}
memset(&tapOvlRead,0,sizeof(tapOvlRead));
tapOvlRead.hEvent = CreateEvent(NULL,TRUE,FALSE,NULL);
memset(&tapOvlWrite,0,sizeof(tapOvlWrite));
tapOvlWrite.hEvent = CreateEvent(NULL,TRUE,FALSE,NULL);
wait4[0] = _injectSemaphore;
wait4[1] = tapOvlRead.hEvent;
wait4[2] = tapOvlWrite.hEvent; // only included if writeInProgress is true
ReadFile(_tap,tapReadBuf,sizeof(tapReadBuf),NULL,&tapOvlRead);
bool writeInProgress = false;
ULONGLONG timeOfLastBorkCheck = GetTickCount64();
_initialized = true;
unsigned int oldmtu = _mtu;
setFriendlyName(_friendlyName.c_str());
while (_run) {
DWORD waitResult = WaitForMultipleObjectsEx(writeInProgress ? 3 : 2,wait4,FALSE,2500,TRUE);
if (!_run) break; // will also break outer while(_run) since _run is false
// Check for changes in MTU and break to restart tap device to reconfigure in this case
if (_mtu != oldmtu)
break;
// Check for issues with adapter and close/reopen if any are detected. This
// check fixes a while boatload of Windows adapter 'coma' issues after
// sleep/wake and when adapters are added/removed. Basically if the tap
// device is borked, whack it.
{
ULONGLONG tc = GetTickCount64();
if ((tc - timeOfLastBorkCheck) >= 2500) {
timeOfLastBorkCheck = tc;
char aabuf[16384];
ULONG aalen = sizeof(aabuf);
if (GetAdaptersAddresses(AF_UNSPEC,GAA_FLAG_SKIP_UNICAST|GAA_FLAG_SKIP_ANYCAST|GAA_FLAG_SKIP_MULTICAST|GAA_FLAG_SKIP_DNS_SERVER|GAA_FLAG_SKIP_FRIENDLY_NAME,(void *)0,reinterpret_cast<PIP_ADAPTER_ADDRESSES>(aabuf),&aalen) == NO_ERROR) {
bool isBorked = false;
PIP_ADAPTER_ADDRESSES aa = reinterpret_cast<PIP_ADAPTER_ADDRESSES>(aabuf);
while (aa) {
if (_deviceLuid.Value == aa->Luid.Value) {
isBorked = (aa->OperStatus != IfOperStatusUp);
break;
}
aa = aa->Next;
}
if (isBorked) {
// Close and reopen tap device if there's an issue (outer loop)
break;
}
}
}
}
if ((waitResult == WAIT_TIMEOUT)||(waitResult == WAIT_FAILED)) {
Sleep(250); // guard against spinning under some conditions
continue;
}
if (HasOverlappedIoCompleted(&tapOvlRead)) {
DWORD bytesRead = 0;
if (GetOverlappedResult(_tap,&tapOvlRead,&bytesRead,FALSE)) {
if ((bytesRead > 14)&&(_enabled)) {
MAC to(tapReadBuf,6);
MAC from(tapReadBuf + 6,6);
unsigned int etherType = ((((unsigned int)tapReadBuf[12]) & 0xff) << 8) | (((unsigned int)tapReadBuf[13]) & 0xff);
try {
_handler(_arg,(void *)0,_nwid,from,to,etherType,0,tapReadBuf + 14,bytesRead - 14);
} catch ( ... ) {} // handlers should not throw
}
}
ReadFile(_tap,tapReadBuf,ZT_MAX_MTU + 32,NULL,&tapOvlRead);
}
if (writeInProgress) {
if (HasOverlappedIoCompleted(&tapOvlWrite)) {
writeInProgress = false;
_injectPending_m.lock();
_injectPending.pop();
} else continue; // still writing, so skip code below and wait
} else _injectPending_m.lock();
if (!_injectPending.empty()) {
WriteFile(_tap,_injectPending.front().data,_injectPending.front().len,NULL,&tapOvlWrite);
writeInProgress = true;
}
_injectPending_m.unlock();
}
CancelIo(_tap);
CloseHandle(tapOvlRead.hEvent);
CloseHandle(tapOvlWrite.hEvent);
CloseHandle(_tap);
_tap = INVALID_HANDLE_VALUE;
// We will restart and re-open the tap unless _run == false
}
} catch ( ... ) {} // catch unexpected exceptions -- this should not happen but would prevent program crash or other weird issues since threads should not throw
CoUninitialize();
}
NET_IFINDEX WindowsEthernetTap::_getDeviceIndex()
{
MIB_IF_TABLE2 *ift = (MIB_IF_TABLE2 *)0;
if (GetIfTable2Ex(MibIfTableRaw,&ift) != NO_ERROR)
throw std::runtime_error("GetIfTable2Ex() failed");
if (ift->NumEntries > 0) {
for(ULONG i=0;i<ift->NumEntries;++i) {
if (ift->Table[i].InterfaceLuid.Value == _deviceLuid.Value) {
NET_IFINDEX idx = ift->Table[i].InterfaceIndex;
FreeMibTable(ift);
return idx;
}
}
}
FreeMibTable(&ift);
throw std::runtime_error("interface not found");
}
std::vector<std::string> WindowsEthernetTap::_getRegistryIPv4Value(const char *regKey)
{
std::vector<std::string> value;
HKEY tcpIpInterfaces;
if (RegOpenKeyExA(HKEY_LOCAL_MACHINE,"SYSTEM\\CurrentControlSet\\services\\Tcpip\\Parameters\\Interfaces",0,KEY_READ|KEY_WRITE,&tcpIpInterfaces) == ERROR_SUCCESS) {
char buf[16384];
DWORD len = sizeof(buf);
DWORD kt = REG_MULTI_SZ;
if (RegGetValueA(tcpIpInterfaces,_netCfgInstanceId.c_str(),regKey,0,&kt,&buf,&len) == ERROR_SUCCESS) {
switch(kt) {
case REG_SZ:
if (len > 0)
value.push_back(std::string(buf));
break;
case REG_MULTI_SZ: {
for(DWORD k=0,s=0;k<len;++k) {
if (!buf[k]) {
if (s < k) {
value.push_back(std::string(buf + s));
s = k + 1;
} else break;
}
}
} break;
}
}
RegCloseKey(tcpIpInterfaces);
}
return value;
}
void WindowsEthernetTap::_setRegistryIPv4Value(const char *regKey,const std::vector<std::string> &value)
{
std::string regMulti;
for(std::vector<std::string>::const_iterator s(value.begin());s!=value.end();++s) {
regMulti.append(*s);
regMulti.push_back((char)0);
}
HKEY tcpIpInterfaces;
if (RegOpenKeyExA(HKEY_LOCAL_MACHINE,"SYSTEM\\CurrentControlSet\\services\\Tcpip\\Parameters\\Interfaces",0,KEY_READ|KEY_WRITE,&tcpIpInterfaces) == ERROR_SUCCESS) {
if (regMulti.length() > 0) {
regMulti.push_back((char)0);
RegSetKeyValueA(tcpIpInterfaces,_netCfgInstanceId.c_str(),regKey,REG_MULTI_SZ,regMulti.data(),(DWORD)regMulti.length());
} else {
RegDeleteKeyValueA(tcpIpInterfaces,_netCfgInstanceId.c_str(),regKey);
}
RegCloseKey(tcpIpInterfaces);
}
}
void WindowsEthernetTap::_syncIps()
{
// assumes _assignedIps_m is locked
if (!_initialized)
return;
std::vector<InetAddress> haveIps(ips());
for(std::vector<InetAddress>::const_iterator aip(_assignedIps.begin());aip!=_assignedIps.end();++aip) {
if (std::find(haveIps.begin(),haveIps.end(),*aip) == haveIps.end()) {
MIB_UNICASTIPADDRESS_ROW ipr;
InitializeUnicastIpAddressEntry(&ipr);
if (aip->isV4()) {
ipr.Address.Ipv4.sin_family = AF_INET;
ipr.Address.Ipv4.sin_addr.S_un.S_addr = *((const uint32_t *)aip->rawIpData());
ipr.OnLinkPrefixLength = aip->netmaskBits();
if (ipr.OnLinkPrefixLength >= 32)
continue;
} else if (aip->isV6()) {
ipr.Address.Ipv6.sin6_family = AF_INET6;
memcpy(ipr.Address.Ipv6.sin6_addr.u.Byte,aip->rawIpData(),16);
ipr.OnLinkPrefixLength = aip->netmaskBits();
if (ipr.OnLinkPrefixLength >= 128)
continue;
} else continue;
ipr.PrefixOrigin = IpPrefixOriginManual;
ipr.SuffixOrigin = IpSuffixOriginManual;
ipr.ValidLifetime = 0xffffffff;
ipr.PreferredLifetime = 0xffffffff;
ipr.InterfaceLuid = _deviceLuid;
ipr.InterfaceIndex = _getDeviceIndex();
CreateUnicastIpAddressEntry(&ipr);
}
if (aip->isV4()) {
char ipbuf[64];
std::string ipStr(aip->toIpString(ipbuf));
std::vector<std::string> regIps(_getRegistryIPv4Value("IPAddress"));
if (std::find(regIps.begin(), regIps.end(), ipStr) == regIps.end()) {
std::vector<std::string> regSubnetMasks(_getRegistryIPv4Value("SubnetMask"));
regIps.push_back(ipStr);
regSubnetMasks.push_back(aip->netmask().toIpString(ipbuf));
_setRegistryIPv4Value("IPAddress", regIps);
_setRegistryIPv4Value("SubnetMask", regSubnetMasks);
}
}
}
}
void WindowsEthernetTap::setDns(const char* domain, const std::vector<InetAddress>& servers)
{
WinDNSHelper::setDNS(_nwid, domain, servers);
}
} // namespace ZeroTier
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