Move OS-dependent implementations of generic interfaces to osdep/ in preparation for TapFactory refactor.

1 files changed, 0 insertions, 839 deletions

diff --git a/node/WindowsEthernetTap.cpp b/node/WindowsEthernetTap.cpp
deleted file mode 100644
index 5ea3d2a9..00000000
--- a/node/WindowsEthernetTap.cpp
+++ /dev/null
@@ -1,839 +0,0 @@
-/*
- * ZeroTier One - Global Peer to Peer Ethernet
- * Copyright (C) 2011-2014  ZeroTier Networks LLC
- *
- * This program is free software: you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation, either version 3 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program.  If not, see <http://www.gnu.org/licenses/>.
- *
- * --
- *
- * ZeroTier may be used and distributed under the terms of the GPLv3, which
- * are available at: http://www.gnu.org/licenses/gpl-3.0.html
- *
- * If you would like to embed ZeroTier into a commercial application or
- * redistribute it in a modified binary form, please contact ZeroTier Networks
- * LLC. Start here: http://www.zerotier.com/
- */
-
-#include "Constants.hpp"
-
-#include <stdio.h>
-#include <stdlib.h>
-#include <stdint.h>
-#include <string.h>
-#include <WinSock2.h>
-#include <Windows.h>
-#include <tchar.h>
-#include <winreg.h>
-#include <wchar.h>
-#include <ws2ipdef.h>
-#include <WS2tcpip.h>
-#include <IPHlpApi.h>
-#include <nldef.h>
-#include <netioapi.h>
-
-#include "EthernetTap.hpp"
-#include "WindowsEthernetTap.hpp"
-#include "Logger.hpp"
-#include "RuntimeEnvironment.hpp"
-#include "Utils.hpp"
-#include "Mutex.hpp"
-
-#include "..\windows\TapDriver\tap-windows.h"
-
-// ff:ff:ff:ff:ff:ff with no ADI
-static const ZeroTier::MulticastGroup _blindWildcardMulticastGroup(ZeroTier::MAC(0xff),0);
-
-namespace ZeroTier {
-
-// Helper function to get an adapter's LUID and index from its GUID. The LUID is
-// constant but the index can change, so go ahead and just look them both up by
-// the GUID which is constant. (The GUID is the instance ID in the registry.)
-static inline std::pair<NET_LUID,NET_IFINDEX> _findAdapterByGuid(const GUID &guid)
-	throw(std::runtime_error)
-{
-	MIB_IF_TABLE2 *ift = (MIB_IF_TABLE2 *)0;
-
-	if (GetIfTable2Ex(MibIfTableRaw,&ift) != NO_ERROR)
-		throw std::runtime_error("GetIfTable2Ex() failed");
-
-	for(ULONG i=0;i<ift->NumEntries;++i) {
-		if (ift->Table[i].InterfaceGuid == guid) {
-			std::pair<NET_LUID,NET_IFINDEX> tmp(ift->Table[i].InterfaceLuid,ift->Table[i].InterfaceIndex);
-			FreeMibTable(ift);
-			return tmp;
-		}
-	}
-
-	FreeMibTable(&ift);
-
-	throw std::runtime_error("interface not found");
-}
-
-// Only create or delete devices one at a time
-static Mutex _systemTapInitLock;
-
-// Compute some basic environment stuff on startup
-class _WinSysEnv
-{
-public:
-	_WinSysEnv()
-	{
-#ifdef _WIN64
-		is64Bit = TRUE;
-		devcon = "\\devcon_x64.exe";
-		tapDriver = "\\tap-windows\\x64\\zttap200.inf";
-#else
-		is64Bit = FALSE;
-		IsWow64Process(GetCurrentProcess(),&is64Bit);
-		devcon = ((is64Bit == TRUE) ? "\\devcon_x64.exe" : "\\devcon_x86.exe");
-		tapDriver = ((is64Bit == TRUE) ? "\\tap-windows\\x64\\zttap200.inf" : "\\tap-windows\\x86\\zttap200.inf");
-#endif
-	}
-	BOOL is64Bit;
-	const char *devcon;
-	const char *tapDriver;
-};
-static const _WinSysEnv _winEnv;
-
-static bool _disableTapDevice(const RuntimeEnvironment *_r,const std::string deviceInstanceId)
-{
-	HANDLE devconLog = CreateFileA((_r->homePath + "\\devcon.log").c_str(),GENERIC_WRITE,FILE_SHARE_READ|FILE_SHARE_WRITE,NULL,OPEN_ALWAYS,FILE_ATTRIBUTE_NORMAL,NULL);
-	if (devconLog != INVALID_HANDLE_VALUE)
-		SetFilePointer(devconLog,0,0,FILE_END);
-
-	STARTUPINFOA startupInfo;
-	startupInfo.cb = sizeof(startupInfo);
-	if (devconLog != INVALID_HANDLE_VALUE) {
-		startupInfo.hStdOutput = devconLog;
-		startupInfo.hStdError = devconLog;
-	}
-	PROCESS_INFORMATION processInfo;
-	memset(&startupInfo,0,sizeof(STARTUPINFOA));
-	memset(&processInfo,0,sizeof(PROCESS_INFORMATION));
-	if (!CreateProcessA(NULL,(LPSTR)(std::string("\"") + _r->homePath + _winEnv.devcon + "\" disable @" + deviceInstanceId).c_str(),NULL,NULL,FALSE,0,NULL,NULL,&startupInfo,&processInfo)) {
-		if (devconLog != INVALID_HANDLE_VALUE)
-			CloseHandle(devconLog);
-		return false;
-	}
-	WaitForSingleObject(processInfo.hProcess,INFINITE);
-	CloseHandle(processInfo.hProcess);
-	CloseHandle(processInfo.hThread);
-
-	if (devconLog != INVALID_HANDLE_VALUE)
-		CloseHandle(devconLog);
-
-	return true;
-}
-static bool _enableTapDevice(const RuntimeEnvironment *_r,const std::string deviceInstanceId)
-{
-	HANDLE devconLog = CreateFileA((_r->homePath + "\\devcon.log").c_str(),GENERIC_WRITE,FILE_SHARE_READ|FILE_SHARE_WRITE,NULL,OPEN_ALWAYS,FILE_ATTRIBUTE_NORMAL,NULL);
-	if (devconLog != INVALID_HANDLE_VALUE)
-		SetFilePointer(devconLog,0,0,FILE_END);
-
-	STARTUPINFOA startupInfo;
-	startupInfo.cb = sizeof(startupInfo);
-	if (devconLog != INVALID_HANDLE_VALUE) {
-		startupInfo.hStdOutput = devconLog;
-		startupInfo.hStdError = devconLog;
-	}
-	PROCESS_INFORMATION processInfo;
-	memset(&startupInfo,0,sizeof(STARTUPINFOA));
-	memset(&processInfo,0,sizeof(PROCESS_INFORMATION));
-	if (!CreateProcessA(NULL,(LPSTR)(std::string("\"") + _r->homePath + _winEnv.devcon + "\" enable @" + deviceInstanceId).c_str(),NULL,NULL,FALSE,0,NULL,NULL,&startupInfo,&processInfo)) {
-		if (devconLog != INVALID_HANDLE_VALUE)
-			CloseHandle(devconLog);
-		return false;
-	}
-	WaitForSingleObject(processInfo.hProcess,INFINITE);
-	CloseHandle(processInfo.hProcess);
-	CloseHandle(processInfo.hThread);
-
-	if (devconLog != INVALID_HANDLE_VALUE)
-		CloseHandle(devconLog);
-
-	return true;
-}
-
-static void _syncIpsWithRegistry(const std::set<InetAddress> &haveIps,const std::string netCfgInstanceId)
-{
-	// Update registry to contain all non-link-local IPs for this interface
-	std::string regMultiIps,regMultiNetmasks;
-	for(std::set<InetAddress>::const_iterator i(haveIps.begin());i!=haveIps.end();++i) {
-		if (!i->isLinkLocal()) {
-			regMultiIps.append(i->toIpString());
-			regMultiIps.push_back((char)0);
-			regMultiNetmasks.append(i->netmask().toIpString());
-			regMultiNetmasks.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 (regMultiIps.length()) {
-			regMultiIps.push_back((char)0);
-			regMultiNetmasks.push_back((char)0);
-			RegSetKeyValueA(tcpIpInterfaces,netCfgInstanceId.c_str(),"IPAddress",REG_MULTI_SZ,regMultiIps.data(),(DWORD)regMultiIps.length());
-			RegSetKeyValueA(tcpIpInterfaces,netCfgInstanceId.c_str(),"SubnetMask",REG_MULTI_SZ,regMultiNetmasks.data(),(DWORD)regMultiNetmasks.length());
-		} else {
-			RegDeleteKeyValueA(tcpIpInterfaces,netCfgInstanceId.c_str(),"IPAddress");
-			RegDeleteKeyValueA(tcpIpInterfaces,netCfgInstanceId.c_str(),"SubnetMask");
-		}
-	}
-	RegCloseKey(tcpIpInterfaces);
-}
-
-WindowsEthernetTap::WindowsEthernetTap(
-	const RuntimeEnvironment *renv,
-	const char *tag,
-	const MAC &mac,
-	unsigned int mtu,
-	void (*handler)(void *,const MAC &,const MAC &,unsigned int,const Buffer<4096> &),
-	void *arg)
-	throw(std::runtime_error) :
-	EthernetTap("WindowsEthernetTap",mac,mtu),
-	_r(renv),
-	_handler(handler),
-	_arg(arg),
-	_tap(INVALID_HANDLE_VALUE),
-	_injectSemaphore(INVALID_HANDLE_VALUE),
-	_run(true),
-	_initialized(false),
-	_enabled(true)
-{
-	char subkeyName[4096];
-	char subkeyClass[4096];
-	char data[4096];
-
-	if (mtu > ZT_IF_MTU)
-		throw std::runtime_error("MTU too large for Windows tap");
-
-	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");
-
-	std::set<std::string> existingDeviceInstances;
-	std::string mySubkeyName;
-
-	// Look for the tap instance that corresponds with our interface tag (network ID)
-	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 instanceId;
-					type = 0;
-					dataLen = sizeof(data);
-					if (RegGetValueA(nwAdapters,subkeyName,"NetCfgInstanceId",RRF_RT_ANY,&type,(PVOID)data,&dataLen) == ERROR_SUCCESS) {
-						instanceId.assign(data,dataLen);
-						existingDeviceInstances.insert(instanceId);
-					}
-
-					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
-	if (_netCfgInstanceId.length() == 0) {
-		// Log devcon output to a file
-		HANDLE devconLog = CreateFileA((_r->homePath + "\\devcon.log").c_str(),GENERIC_WRITE,FILE_SHARE_READ|FILE_SHARE_WRITE,NULL,OPEN_ALWAYS,FILE_ATTRIBUTE_NORMAL,NULL);
-		if (devconLog == INVALID_HANDLE_VALUE) {
-			LOG("WARNING: unable to open devcon.log");
-		} else {
-			SetFilePointer(devconLog,0,0,FILE_END);
-		}
-
-		// Execute devcon to install an instance of the Microsoft Loopback Adapter
-		STARTUPINFOA startupInfo;
-		startupInfo.cb = sizeof(startupInfo);
-		if (devconLog != INVALID_HANDLE_VALUE) {
-			SetFilePointer(devconLog,0,0,FILE_END);
-			startupInfo.hStdOutput = devconLog;
-			startupInfo.hStdError = devconLog;
-		}
-		PROCESS_INFORMATION processInfo;
-		memset(&startupInfo,0,sizeof(STARTUPINFOA));
-		memset(&processInfo,0,sizeof(PROCESS_INFORMATION));
-		if (!CreateProcessA(NULL,(LPSTR)(std::string("\"") + _r->homePath + _winEnv.devcon + "\" install \"" + _r->homePath + _winEnv.tapDriver + "\" zttap200").c_str(),NULL,NULL,FALSE,0,NULL,NULL,&startupInfo,&processInfo)) {
-			RegCloseKey(nwAdapters);
-			if (devconLog != INVALID_HANDLE_VALUE)
-				CloseHandle(devconLog);
-			throw std::runtime_error(std::string("unable to find or execute devcon at ") + _winEnv.devcon);
-		}
-		WaitForSingleObject(processInfo.hProcess,INFINITE);
-		CloseHandle(processInfo.hProcess);
-		CloseHandle(processInfo.hThread);
-
-		if (devconLog != INVALID_HANDLE_VALUE)
-			CloseHandle(devconLog);
-
-		// Scan for the new instance by simply looking for taps that weren't
-		// there originally. The static mutex we lock ensures this can't step
-		// on its own toes.
-		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)) {
-						type = 0;
-						dataLen = sizeof(data);
-						if (RegGetValueA(nwAdapters,subkeyName,"NetCfgInstanceId",RRF_RT_ANY,&type,(PVOID)data,&dataLen) == ERROR_SUCCESS) {
-							if (existingDeviceInstances.count(std::string(data,dataLen)) == 0) {
-								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 newly created 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 it!
-							}
-						}
-					}
-				}
-			} else break; // no more keys or error occurred
-		}
-	}
-
-	if (_netCfgInstanceId.length() > 0) {
-		char tmps[4096];
-		unsigned int tmpsl = Utils::snprintf(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);
-		DWORD tmp = mtu;
-		RegSetKeyValueA(nwAdapters,mySubkeyName.c_str(),"MTU",REG_DWORD,(LPCVOID)&tmp,sizeof(tmp));
-		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");
-	}
-
-	// Convert device GUID junk... blech... is there an easier way to do this?
-	{
-		char nobraces[128];
-		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?)");
-	}
-
-	// Start background thread that actually performs I/O
-	_injectSemaphore = CreateSemaphore(NULL,0,1,NULL);
-	_thread = Thread::start(this);
-
-	// Certain functions can now work (e.g. ips())
-	_initialized = true;
-}
-
-WindowsEthernetTap::~WindowsEthernetTap()
-{
-	_run = false;
-	ReleaseSemaphore(_injectSemaphore,1,NULL);
-	Thread::join(_thread);
-	CloseHandle(_injectSemaphore);
-	_disableTapDevice(_r,_deviceInstanceId);
-}
-
-void WindowsEthernetTap::setEnabled(bool en)
-{
-	_enabled = en;
-}
-
-bool WindowsEthernetTap::enabled() const
-{
-	return _enabled;
-}
-
-void WindowsEthernetTap::setDisplayName(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);
-	}
-}
-
-bool WindowsEthernetTap::addIP(const InetAddress &ip)
-{
-	if (!_initialized)
-		return false;
-	if (!ip.netmaskBits()) // sanity check... netmask of 0.0.0.0 is WUT?
-		return false;
-
-	std::set<InetAddress> haveIps(ips());
-
-	try {
-		// Add IP to interface at the netlink level if not already assigned.
-		if (!haveIps.count(ip)) {
-			std::pair<NET_LUID,NET_IFINDEX> ifidx = _findAdapterByGuid(_deviceGuid);
-			MIB_UNICASTIPADDRESS_ROW ipr;
-
-			InitializeUnicastIpAddressEntry(&ipr);
-			if (ip.isV4()) {
-				ipr.Address.Ipv4.sin_family = AF_INET;
-				ipr.Address.Ipv4.sin_addr.S_un.S_addr = *((const uint32_t *)ip.rawIpData());
-				ipr.OnLinkPrefixLength = ip.port();
-				if (ipr.OnLinkPrefixLength >= 32)
-					return false;
-			} else if (ip.isV6()) {
-				ipr.Address.Ipv6.sin6_family = AF_INET6;
-				memcpy(ipr.Address.Ipv6.sin6_addr.u.Byte,ip.rawIpData(),16);
-				ipr.OnLinkPrefixLength = ip.port();
-				if (ipr.OnLinkPrefixLength >= 128)
-					return false;
-			} else return false;
-
-			ipr.PrefixOrigin = IpPrefixOriginManual;
-			ipr.SuffixOrigin = IpSuffixOriginManual;
-			ipr.ValidLifetime = 0xffffffff;
-			ipr.PreferredLifetime = 0xffffffff;
-
-			ipr.InterfaceLuid = ifidx.first;
-			ipr.InterfaceIndex = ifidx.second;
-
-			if (CreateUnicastIpAddressEntry(&ipr) == NO_ERROR) {
-				haveIps.insert(ip);
-			} else {
-				LOG("unable to add IP address %s to interface %s: %d",ip.toString().c_str(),deviceName().c_str(),(int)GetLastError());
-				return false;
-			}
-		}
-
-		_syncIpsWithRegistry(haveIps,_netCfgInstanceId);
-	} catch (std::exception &exc) {
-		LOG("unexpected exception adding IP address %s to %s: %s",ip.toString().c_str(),deviceName().c_str(),exc.what());
-		return false;
-	} catch ( ... ) {
-		LOG("unexpected exception adding IP address %s to %s: unknown exception",ip.toString().c_str(),deviceName().c_str());
-		return false;
-	}
-	return true;
-}
-
-bool WindowsEthernetTap::removeIP(const InetAddress &ip)
-{
-	if (!_initialized)
-		return false;
-	try {
-		MIB_UNICASTIPADDRESS_TABLE *ipt = (MIB_UNICASTIPADDRESS_TABLE *)0;
-		std::pair<NET_LUID,NET_IFINDEX> ifidx = _findAdapterByGuid(_deviceGuid);
-		if (GetUnicastIpAddressTable(AF_UNSPEC,&ipt) == NO_ERROR) {
-			for(DWORD i=0;i<ipt->NumEntries;++i) {
-				if ((ipt->Table[i].InterfaceLuid.Value == ifidx.first.Value)&&(ipt->Table[i].InterfaceIndex == ifidx.second)) {
-					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.isLinkLocal())
-								continue; // can't remove link-local IPv6 addresses
-							break;
-					}
-					if (addr == ip) {
-						DeleteUnicastIpAddressEntry(&(ipt->Table[i]));
-						FreeMibTable(ipt);
-						_syncIpsWithRegistry(ips(),_netCfgInstanceId);
-						return true;
-					}
-				}
-			}
-			FreeMibTable((PVOID)ipt);
-		}
-	} catch (std::exception &exc) {
-		LOG("unexpected exception removing IP address %s from %s: %s",ip.toString().c_str(),deviceName().c_str(),exc.what());
-	} catch ( ... ) {
-		LOG("unexpected exception removing IP address %s from %s: unknown exception",ip.toString().c_str(),deviceName().c_str());
-	}
-	return false;
-}
-
-std::set<InetAddress> WindowsEthernetTap::ips() const
-{
-	static const InetAddress linkLocalLoopback("fe80::1",64); // what is this and why does Windows assign it?
-	std::set<InetAddress> addrs;
-
-	if (!_initialized)
-		return addrs;
-
-	try {
-		MIB_UNICASTIPADDRESS_TABLE *ipt = (MIB_UNICASTIPADDRESS_TABLE *)0;
-		std::pair<NET_LUID,NET_IFINDEX> ifidx = _findAdapterByGuid(_deviceGuid);
-
-		if (GetUnicastIpAddressTable(AF_UNSPEC,&ipt) == NO_ERROR) {
-			for(DWORD i=0;i<ipt->NumEntries;++i) {
-				if ((ipt->Table[i].InterfaceLuid.Value == ifidx.first.Value)&&(ipt->Table[i].InterfaceIndex == ifidx.second)) {
-					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.insert(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.insert(ip);
-						}	break;
-					}
-				}
-			}
-			FreeMibTable(ipt);
-		}
-	} catch ( ... ) {} // sanity check, shouldn't happen unless out of memory
-
-	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 > (ZT_IF_MTU)))
-		return;
-	{
-		Mutex::Lock _l(_injectPending_m);
-		_injectPending.push( std::pair<Array<char,ZT_IF_MTU + 32>,unsigned int>(Array<char,ZT_IF_MTU + 32>(),len + 14) );
-		char *d = _injectPending.back().first.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
-{
-	return _netCfgInstanceId;
-}
-
-std::string WindowsEthernetTap::persistentId() const
-{
-	return _deviceInstanceId;
-}
-
-bool WindowsEthernetTap::updateMulticastGroups(std::set<MulticastGroup> &groups)
-{
-	if (!_initialized)
-		return false;
-	HANDLE t = _tap;
-	if (t == INVALID_HANDLE_VALUE)
-		return false;
-
-	std::set<MulticastGroup> newGroups;
-
-	// Ensure that groups are added for each IP... this handles the MAC:ADI
-	// groups that are created from IPv4 addresses. Some of these may end
-	// up being duplicates of what the IOCTL returns but that's okay since
-	// the set<> will filter that.
-	std::set<InetAddress> ipaddrs(ips());
-	for(std::set<InetAddress>::const_iterator i(ipaddrs.begin());i!=ipaddrs.end();++i)
-		newGroups.insert(MulticastGroup::deriveMulticastGroupForAddressResolution(*i));
-
-	// 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)0,0,(LPVOID)mcastbuf,sizeof(mcastbuf),&bytesReturned,NULL)) {
-		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.insert(MulticastGroup(mac,0));
-			}
-		}
-	}
-
-	bool changed = false;
-
-	for(std::set<MulticastGroup>::iterator mg(newGroups.begin());mg!=newGroups.end();++mg) {
-		if (!groups.count(*mg)) {
-			groups.insert(*mg);
-			changed = true;
-		}
-	}
-	for(std::set<MulticastGroup>::iterator mg(groups.begin());mg!=groups.end();) {
-		if ((!newGroups.count(*mg))&&(*mg != _blindWildcardMulticastGroup)) {
-			groups.erase(mg++);
-			changed = true;
-		} else ++mg;
-	}
-
-	return changed;
-}
-
-void WindowsEthernetTap::threadMain()
-	throw()
-{
-	char tapPath[256];
-	OVERLAPPED tapOvlRead,tapOvlWrite;
-	HANDLE wait4[3];
-	char *tapReadBuf = (char *)0;
-
-	// Shouldn't be needed, but Windows does not overcommit. This Windows
-	// tap code is defensive to schizoid paranoia degrees.
-	while (!tapReadBuf) {
-		tapReadBuf = (char *)::malloc(ZT_IF_MTU + 32);
-		if (!tapReadBuf)
-			Sleep(1000);
-	}
-
-	// Tap is in this weird Windows global pseudo file space
-	Utils::snprintf(tapPath,sizeof(tapPath),"\\\\.\\Global\\%s.tap",_netCfgInstanceId.c_str());
-
-	// More insanity: repetatively try to enable/disable tap device. The first
-	// time we succeed, close it and do it again. This is to fix a driver init
-	// bug that seems to be extremely non-deterministic and to only occur after
-	// headless MSI upgrade. It cannot be reproduced in any other circumstance.
-	bool throwOneAway = true;
-	while (_run) {
-		_disableTapDevice(_r,_deviceInstanceId);
-		Sleep(250);
-		if (!_enableTapDevice(_r,_deviceInstanceId)) {
-			::free(tapReadBuf);
-			_enabled = false;
-			return; // only happens if devcon is missing or totally fails
-		}
-		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(500);
-			continue;
-		}
-
-		uint32_t tmpi = 1;
-		DWORD bytesReturned = 0;
-		DeviceIoControl(_tap,TAP_WIN_IOCTL_SET_MEDIA_STATUS,&tmpi,sizeof(tmpi),&tmpi,sizeof(tmpi),&bytesReturned,NULL);
-
-		if (throwOneAway) {
-			throwOneAway = false;
-			CloseHandle(_tap);
-			_tap = INVALID_HANDLE_VALUE;
-			Sleep(250);
-			continue;
-		} else break;
-	}
-
-	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
-
-	// Start overlapped read, which is always active
-	ReadFile(_tap,tapReadBuf,sizeof(tapReadBuf),NULL,&tapOvlRead);
-	bool writeInProgress = false;
-
-	for(;;) {
-		if (!_run) break;
-		DWORD r = WaitForMultipleObjectsEx(writeInProgress ? 3 : 2,wait4,FALSE,5000,TRUE);
-		if (!_run) break;
-
-		if ((r == WAIT_TIMEOUT)||(r == WAIT_FAILED))
-			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 {
-						Buffer<4096> tmp(tapReadBuf + 14,bytesRead - 14);
-						_handler(_arg,from,to,etherType,tmp);
-					} catch ( ... ) {} // handlers should not throw
-				}
-			}
-			ReadFile(_tap,tapReadBuf,ZT_IF_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().first.data,_injectPending.front().second,NULL,&tapOvlWrite);
-			writeInProgress = true;
-		}
-
-		_injectPending_m.unlock();
-	}
-
-	CancelIo(_tap);
-
-	CloseHandle(tapOvlRead.hEvent);
-	CloseHandle(tapOvlWrite.hEvent);
-	CloseHandle(_tap);
-	_tap = INVALID_HANDLE_VALUE;
-
-	::free(tapReadBuf);
-}
-
-bool WindowsEthernetTap::deletePersistentTapDevice(const RuntimeEnvironment *_r,const char *pid)
-{
-	Mutex::Lock _l(_systemTapInitLock); // only one thread may mess with taps at a time, process-wide
-
-	HANDLE devconLog = CreateFileA((_r->homePath + "\\devcon.log").c_str(),GENERIC_WRITE,FILE_SHARE_READ|FILE_SHARE_WRITE,NULL,OPEN_ALWAYS,FILE_ATTRIBUTE_NORMAL,NULL);
-	STARTUPINFOA startupInfo;
-	startupInfo.cb = sizeof(startupInfo);
-	if (devconLog != INVALID_HANDLE_VALUE) {
-		SetFilePointer(devconLog,0,0,FILE_END);
-		startupInfo.hStdOutput = devconLog;
-		startupInfo.hStdError = devconLog;
-	}
-	PROCESS_INFORMATION processInfo;
-	memset(&startupInfo,0,sizeof(STARTUPINFOA));
-	memset(&processInfo,0,sizeof(PROCESS_INFORMATION));
-	if (CreateProcessA(NULL,(LPSTR)(std::string("\"") + _r->homePath + _winEnv.devcon + "\" remove @" + pid).c_str(),NULL,NULL,FALSE,0,NULL,NULL,&startupInfo,&processInfo)) {
-		WaitForSingleObject(processInfo.hProcess,INFINITE);
-		CloseHandle(processInfo.hProcess);
-		CloseHandle(processInfo.hThread);
-		if (devconLog != INVALID_HANDLE_VALUE)
-			CloseHandle(devconLog);
-		return true;
-	}
-	if (devconLog != INVALID_HANDLE_VALUE)
-		CloseHandle(devconLog);
-
-	return false;
-}
-
-int WindowsEthernetTap::cleanPersistentTapDevices(const RuntimeEnvironment *_r,const std::set<std::string> &exceptThese,bool alsoRemoveUnassociatedDevices)
-{
-	char subkeyName[4096];
-	char subkeyClass[4096];
-	char data[4096];
-
-	std::set<std::string> instanceIdPathsToRemove;
-	{
-		Mutex::Lock _l(_systemTapInitLock); // only one thread may mess with taps at a time, process-wide
-
-		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 -1;
-
-		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) {
-							type = 0;
-							dataLen = sizeof(data);
-							if (RegGetValueA(nwAdapters,subkeyName,"_ZeroTierTapIdentifier",RRF_RT_ANY,&type,(PVOID)data,&dataLen) == ERROR_SUCCESS) {
-								if (dataLen <= 0) {
-									if (alsoRemoveUnassociatedDevices)
-										instanceIdPathsToRemove.insert(instanceIdPath);
-								} else {
-									if (!exceptThese.count(std::string(data,dataLen)))
-										instanceIdPathsToRemove.insert(instanceIdPath);
-								}
-							} else if (alsoRemoveUnassociatedDevices)
-								instanceIdPathsToRemove.insert(instanceIdPath);
-						}
-					}
-				}
-			} else break; // end of list or failure
-		}
-
-		RegCloseKey(nwAdapters);
-	}
-
-	int removed = 0;
-	for(std::set<std::string>::iterator iidp(instanceIdPathsToRemove.begin());iidp!=instanceIdPathsToRemove.end();++iidp) {
-		if (deletePersistentTapDevice(_r,iidp->c_str()))
-			++removed;
-	}
-	return removed;
-}
-
-} // namespace ZeroTier