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/*
* anytun
*
* The secure anycast tunneling protocol (satp) defines a protocol used
* for communication between any combination of unicast and anycast
* tunnel endpoints. It has less protocol overhead than IPSec in Tunnel
* mode and allows tunneling of every ETHER TYPE protocol (e.g.
* ethernet, ip, arp ...). satp directly includes cryptography and
* message authentication based on the methodes used by SRTP. It is
* intended to deliver a generic, scaleable and secure solution for
* tunneling and relaying of packets of any protocol.
*
*
* Copyright (C) 2007-2008 Othmar Gsenger, Erwin Nindl,
* Christian Pointner <satp@wirdorange.org>
*
* This file is part of Anytun.
*
* Anytun is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 3 as
* published by the Free Software Foundation.
*
* Anytun 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 anytun. If not, see <http://www.gnu.org/licenses/>.
*/
#include <string.h>
#include <sstream>
#include <windows.h>
#include <winioctl.h>
#include "../endian.h"
#include "../tunDevice.h"
#include "../threadUtils.hpp"
#include "../log.h"
#include "registryKey.h"
#include "common.h"
#define MIN_TAP_VER_MAJOR 8
#define MIN_TAP_VER_MINOR 2
TunDevice::TunDevice(std::string dev_name, std::string dev_type, std::string ifcfg_addr, u_int16_t ifcfg_prefix) : conf_(dev_name, dev_type, ifcfg_addr, ifcfg_prefix, 1400)
{
if(conf_.type_ != TYPE_TUN && conf_.type_ != TYPE_TAP)
throw std::runtime_error("unable to recognize type of device (tun or tap)");
handle_ = INVALID_HANDLE_VALUE;
if(!getAdapter(dev_name))
throw std::runtime_error("can't find any suitable device");
if(handle_ == INVALID_HANDLE_VALUE) {
std::stringstream tapname;
tapname << USERMODEDEVICEDIR << actual_node_ << TAPSUFFIX;
handle_ = CreateFileA(tapname.str().c_str(), GENERIC_WRITE | GENERIC_READ, 0, 0, OPEN_EXISTING, FILE_ATTRIBUTE_SYSTEM | FILE_FLAG_OVERLAPPED, 0);
if(handle_ == INVALID_HANDLE_VALUE) {
std::stringstream msg;
msg << "Unable to open device: " << actual_node_ << " (" << actual_name_ << "): " << LogErrno(GetLastError());
throw std::runtime_error(msg.str());
}
}
DWORD err;
u_long info[3];
info[0] = info[1] = info[2] = 0;
err = performIoControl(TAP_IOCTL_GET_VERSION, info, sizeof(info), info, sizeof(info));
if(err != ERROR_SUCCESS) {
CloseHandle(handle_);
std::stringstream msg;
msg << "Unable to get device version: " << LogErrno(err);
throw std::runtime_error(msg.str());
}
cLog.msg(Log::PRIO_NOTICE) << "Windows TAP Driver Version " << info[0] << "." << info[1] << " " << (info[2] ? "(DEBUG)" : "");
if(!(info[0] > MIN_TAP_VER_MAJOR || (info[0] == MIN_TAP_VER_MAJOR && info[1] >= MIN_TAP_VER_MINOR))) {
CloseHandle(handle_);
std::stringstream msg;
msg << "need a higher Version of TAP Driver (at least " << MIN_TAP_VER_MAJOR << "." << MIN_TAP_VER_MINOR << ")";
throw std::runtime_error(msg.str());
}
if(conf_.type_ == TYPE_TUN) {
u_long ep[3];
ep[0] = htonl(conf_.addr_.getNetworkAddressV4().to_ulong());
ep[1] = htonl(conf_.addr_.getNetworkAddressV4().to_ulong() & conf_.netmask_.getNetworkAddressV4().to_ulong());
ep[2] = htonl(conf_.netmask_.getNetworkAddressV4().to_ulong());
err = performIoControl(TAP_IOCTL_CONFIG_TUN, ep, sizeof(ep), ep, sizeof(ep));
if(err != ERROR_SUCCESS) {
CloseHandle(handle_);
std::stringstream msg;
msg << "Unable to set device tun mode: " << LogErrno(err);
throw std::runtime_error(msg.str());
}
}
if(ifcfg_addr != "")
do_ifconfig();
int status = true;
err = performIoControl(TAP_IOCTL_SET_MEDIA_STATUS, &status, sizeof(status), &status, sizeof(status));
if(err != ERROR_SUCCESS) {
CloseHandle(handle_);
std::stringstream msg;
msg << "Unable to set device media status: " << LogErrno(err);
throw std::runtime_error(msg.str());
}
roverlapped_.hEvent = CreateEvent(NULL, TRUE, FALSE, NULL);
woverlapped_.hEvent = CreateEvent(NULL, TRUE, FALSE, NULL);
}
bool TunDevice::getAdapter(std::string const& dev_name)
{
RegistryKey akey;
DWORD err = akey.open(HKEY_LOCAL_MACHINE, ADAPTER_KEY, KEY_ENUMERATE_SUB_KEYS);
if(err != ERROR_SUCCESS) {
std::stringstream msg;
msg << "Unable to open registry key (HKLM\\" << ADAPTER_KEY << "): " << LogErrno(err);
throw std::runtime_error(msg.str());
}
bool found = false;
for(int i=0; ; ++i) {
RegistryKey ckey;
DWORD err = akey.getSubKey(i, ckey, KEY_QUERY_VALUE);
if(err == ERROR_NO_MORE_ITEMS)
break;
if(err != ERROR_SUCCESS)
continue;
try {
if(ckey["ComponentId"] != TAP_COMPONENT_ID)
continue;
actual_node_ = ckey["NetCfgInstanceId"];
RegistryKey nkey;
std::stringstream keyname;
keyname << NETWORK_CONNECTIONS_KEY << "\\" << actual_node_ << "\\Connection";
err = nkey.open(HKEY_LOCAL_MACHINE, keyname.str().c_str(), KEY_QUERY_VALUE);;
if(err != ERROR_SUCCESS)
continue;
actual_name_ = nkey["Name"];
} catch(LogErrno& e) { continue; }
if(dev_name != "") {
if(dev_name == actual_name_) {
found = true;
break;
}
}
else {
std::stringstream tapname;
tapname << USERMODEDEVICEDIR << actual_node_ << TAPSUFFIX;
handle_ = CreateFileA(tapname.str().c_str(), GENERIC_WRITE | GENERIC_READ, 0, 0, OPEN_EXISTING, FILE_ATTRIBUTE_SYSTEM | FILE_FLAG_OVERLAPPED, 0);
if(handle_ == INVALID_HANDLE_VALUE)
continue;
found = true;
break;
}
}
if(!found) {
actual_node_ = "";
actual_name_ = "";
}
return found;
}
DWORD TunDevice::performIoControl(DWORD controlCode, LPVOID inBuffer, DWORD inBufferSize, LPVOID outBuffer, DWORD outBufferSize)
{
OVERLAPPED overlapped;
overlapped.hEvent = CreateEvent(NULL, TRUE, FALSE, NULL);
overlapped.Offset = 0;
overlapped.OffsetHigh = 0;
DWORD len;
if(!DeviceIoControl(handle_, controlCode, inBuffer, inBufferSize, outBuffer, outBufferSize, &len, &overlapped)) {
DWORD err = GetLastError();
if(err == ERROR_IO_PENDING) {
WaitForSingleObject(overlapped.hEvent, INFINITE);
if(!GetOverlappedResult(handle_, &overlapped, &len, FALSE))
return GetLastError();
}
else
return GetLastError();
}
return ERROR_SUCCESS;
}
TunDevice::~TunDevice()
{
if(handle_ != INVALID_HANDLE_VALUE)
CloseHandle(handle_);
if(roverlapped_.hEvent != INVALID_HANDLE_VALUE)
CloseHandle(roverlapped_.hEvent);
if(woverlapped_.hEvent != INVALID_HANDLE_VALUE)
CloseHandle(woverlapped_.hEvent);
}
int TunDevice::fix_return(int ret, size_t pi_length)
{
// nothing to be done here
return 0;
}
int TunDevice::read(u_int8_t* buf, u_int32_t len)
{
DWORD lenout;
roverlapped_.Offset = 0;
roverlapped_.OffsetHigh = 0;
ResetEvent(roverlapped_.hEvent);
if(!ReadFile(handle_, buf, len, &lenout, &roverlapped_)) {
DWORD err = GetLastError();
if(err == ERROR_IO_PENDING) {
WaitForSingleObject(roverlapped_.hEvent, INFINITE);
if(!GetOverlappedResult(handle_, &roverlapped_, &lenout, FALSE)) {
cLog.msg(Log::PRIO_ERR) << "Error while trying to get overlapped result: " << LogErrno(GetLastError());
return -1;
}
}
else {
cLog.msg(Log::PRIO_ERR) << "Error while reading from device: " << LogErrno(GetLastError());
return -1;
}
}
return lenout;
}
int TunDevice::write(u_int8_t* buf, u_int32_t len)
{
DWORD lenout;
woverlapped_.Offset = 0;
woverlapped_.OffsetHigh = 0;
ResetEvent(woverlapped_.hEvent);
if(!WriteFile(handle_, buf, len, &lenout, &woverlapped_)) {
DWORD err = GetLastError();
if(err == ERROR_IO_PENDING) {
WaitForSingleObject(woverlapped_.hEvent, INFINITE);
if(!GetOverlappedResult(handle_, &woverlapped_, &lenout, FALSE)) {
cLog.msg(Log::PRIO_ERR) << "Error while trying to get overlapped result: " << LogErrno(GetLastError());
return -1;
}
}
else {
cLog.msg(Log::PRIO_ERR) << "Error while writing to device: " << LogErrno(GetLastError());
return -1;
}
}
return lenout;
}
void TunDevice::init_post()
{
// nothing to be done here
}
void TunDevice::do_ifconfig()
{
u_long ep[4];
ep[0] = htonl(conf_.addr_.getNetworkAddressV4().to_ulong());
ep[1] = htonl(conf_.netmask_.getNetworkAddressV4().to_ulong());
ep[2] = htonl(conf_.addr_.getNetworkAddressV4().to_ulong() & conf_.netmask_.getNetworkAddressV4().to_ulong());
ep[3] = 365 * 24 * 3600; // lease time in seconds
DWORD err = performIoControl(TAP_IOCTL_CONFIG_DHCP_MASQ, ep, sizeof(ep), ep, sizeof(ep));
if(err != ERROR_SUCCESS) {
CloseHandle(handle_);
std::stringstream msg;
msg << "Unable to set device dhcp masq mode: " << LogErrno(err);
throw std::runtime_error(msg.str());
}
}
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