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Windows: disable and enable tap to allow changes to take effect.

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This commit is contained in:
Adam Ierymenko 2013-08-26 17:48:47 -04:00
parent 487eb17ec0
commit 4a370c5f3f
2 changed files with 52 additions and 8 deletions
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57
node/EthernetTap.cpp
View File

@ -750,6 +750,13 @@ EthernetTap::EthernetTap(
if (mtu > ZT_IF_MTU)
throw std::runtime_error("MTU too large for Windows tap");
#ifdef _WIN64
const char *devcon = "\\devcon64.exe";
#else
BOOL f64 = FALSE;
const char *devcon = ((IsWow64Process(GetCurrentProcess(),&f64) == TRUE) ? "\\devcon64.exe" : "\\devcon32.exe");
#endif
Mutex::Lock _l(_systemTapInitLock); // only init one tap at a time, process-wide
HKEY nwAdapters;
@ -782,13 +789,20 @@ EthernetTap::EthernetTap(
existingDeviceInstances.insert(instanceId);
}
if ((_myDeviceInstanceId.length() == 0)&&(instanceId.length() != 0)) {
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 ((_myDeviceInstanceId.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)) {
_myDeviceInstanceId = instanceId;
_myDeviceInstanceIdPath = instanceIdPath;
mySubkeyName = subkeyName;
subkeyIndex = -1; // break outer loop
}
@ -803,12 +817,6 @@ EthernetTap::EthernetTap(
// If there is no device, try to create one
if (_myDeviceInstanceId.length() == 0) {
// Execute devcon to install an instance of the Microsoft Loopback Adapter
#ifdef _WIN64
const char *devcon = "\\devcon64.exe";
#else
BOOL f64 = FALSE;
const char *devcon = ((IsWow64Process(GetCurrentProcess(),&f64) == TRUE) ? "\\devcon64.exe" : "\\devcon32.exe");
#endif
STARTUPINFOA startupInfo;
startupInfo.cb = sizeof(startupInfo);
PROCESS_INFORMATION processInfo;
@ -844,6 +852,10 @@ EthernetTap::EthernetTap(
if (existingDeviceInstances.count(std::string(data,dataLen)) == 0) {
RegSetKeyValueA(nwAdapters,subkeyName,"_ZeroTierTapIdentifier",REG_SZ,tag,(DWORD)(strlen(tag)+1));
_myDeviceInstanceId.assign(data,dataLen);
type = 0;
dataLen = sizeof(data);
if (RegGetValueA(nwAdapters,subkeyName,"DeviceInstanceID",RRF_RT_ANY,&type,(PVOID)data,&dataLen) == ERROR_SUCCESS)
_myDeviceInstanceIdPath.assign(data,dataLen);
mySubkeyName = subkeyName;
subkeyIndex = -1; // break outer loop
}
@ -885,6 +897,37 @@ EthernetTap::EthernetTap(
throw std::runtime_error("unable to convert instance ID GUID to native GUID (invalid NetCfgInstanceId in registry?)");
}
// Disable and enable interface to ensure settings take effect
{
STARTUPINFOA startupInfo;
startupInfo.cb = sizeof(startupInfo);
PROCESS_INFORMATION processInfo;
memset(&startupInfo,0,sizeof(STARTUPINFOA));
memset(&processInfo,0,sizeof(PROCESS_INFORMATION));
if (!CreateProcessA(NULL,(LPSTR)(std::string("\"") + _r->homePath + devcon + "\" disable @" + _myDeviceInstanceIdPath).c_str(),NULL,NULL,FALSE,0,NULL,NULL,&startupInfo,&processInfo)) {
RegCloseKey(nwAdapters);
throw std::runtime_error(std::string("unable to find or execute devcon at ")+devcon);
}
WaitForSingleObject(processInfo.hProcess,INFINITE);
CloseHandle(processInfo.hProcess);
CloseHandle(processInfo.hThread);
}
{
STARTUPINFOA startupInfo;
startupInfo.cb = sizeof(startupInfo);
PROCESS_INFORMATION processInfo;
memset(&startupInfo,0,sizeof(STARTUPINFOA));
memset(&processInfo,0,sizeof(PROCESS_INFORMATION));
if (!CreateProcessA(NULL,(LPSTR)(std::string("\"") + _r->homePath + devcon + "\" enable @" + _myDeviceInstanceIdPath).c_str(),NULL,NULL,FALSE,0,NULL,NULL,&startupInfo,&processInfo)) {
RegCloseKey(nwAdapters);
throw std::runtime_error(std::string("unable to find or execute devcon at ")+devcon);
}
WaitForSingleObject(processInfo.hProcess,INFINITE);
CloseHandle(processInfo.hProcess);
CloseHandle(processInfo.hThread);
}
// Open the tap, which is in this weird Windows analog of /dev
#ifdef UNICODE
wchar_t tapPath[4096];
swprintf_s(tapPath,L"\\\\.\\Global\\%S.tap",_myDeviceInstanceId.c_str());

3
node/EthernetTap.hpp
View File

@ -219,7 +219,8 @@ private:
char _tapReadBuf[ZT_IF_MTU + 32];
HANDLE _injectSemaphore;
GUID _deviceGuid;
std::string _myDeviceInstanceId;
std::string _myDeviceInstanceId; // NetCfgInstanceId, a GUID
std::string _myDeviceInstanceIdPath; // DeviceInstanceID, another kind of "instance ID"
std::queue< std::pair< Array<char,ZT_IF_MTU + 32>,unsigned int > > _injectPending;
Mutex _injectPending_m;
volatile bool _run;