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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 "../tunDevice.h"
#include "../threadUtils.hpp"
#include "../log.h"
#include "common.h"
#include <windows.h>
#include <winioctl.h>
#define REG_KEY_LENGTH 256
#define REG_NAME_LENGTH 256
TunDevice::TunDevice(std::string dev_name, std::string dev_type, std::string ifcfg_lp, std::string ifcfg_rnmp) : conf_(dev_name, dev_type, ifcfg_lp, ifcfg_rnmp, 1400)
{
// if(conf_.type_ != TYPE_TUN && conf_.type_ != TYPE_TAP)
// throw std::runtime_error("unable to recognize type of device (tun or tap)");
if(conf_.type_ != TYPE_TAP)
throw std::runtime_error("currently only support for typ devices on windows");
HKEY key, key2;
LONG err = RegOpenKeyEx(HKEY_LOCAL_MACHINE, NETWORK_CONNECTIONS_KEY, 0, KEY_ENUMERATE_SUB_KEYS, &key);
if(err != ERROR_SUCCESS) {
std::stringstream msg;
msg << "Unable to open registry key: " << LogErrno(err);
throw std::runtime_error(msg.str());
}
handle_ = INVALID_HANDLE_VALUE;
bool found = false;
DWORD len;
char adapterid[REG_KEY_LENGTH];
char adaptername[REG_NAME_LENGTH];
for(int i=0; ; ++i) {
len = sizeof(adapterid);
err = RegEnumKeyEx(key, i, adapterid, &len, NULL, NULL, NULL, NULL);
if(err == ERROR_NO_MORE_ITEMS)
break;
if(err != ERROR_SUCCESS) {
RegCloseKey(key);
std::stringstream msg;
msg << "Unable to read registry: " << LogErrno(err);
throw std::runtime_error(msg.str());
}
std::stringstream regpath;
regpath << NETWORK_CONNECTIONS_KEY << "\\" << adapterid << "\\Connection";
err = RegOpenKeyEx(HKEY_LOCAL_MACHINE, regpath.str().c_str(), 0, KEY_QUERY_VALUE, &key2);
if(err != ERROR_SUCCESS)
continue;
len = sizeof(adaptername);
err = RegQueryValueEx(key2, "Name", NULL, NULL, (LPBYTE)adaptername, &len);
RegCloseKey(key2);
if(err != ERROR_SUCCESS) // || len >= sizeof(adaptername))
continue;
if(adaptername[len-1] != 0) {
if(len < sizeof(adaptername))
adaptername[len++] = 0;
else
continue;
}
if(dev_name != "") {
if(!dev_name.compare(0, len-1, adaptername)) {
found = true;
break;
}
}
else {
std::stringstream tapname;
tapname << USERMODEDEVICEDIR << adapterid << TAPSUFFIX;
handle_ = CreateFile(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;
}
}
RegCloseKey(key);
if(!found)
throw std::runtime_error("can't find any suitable device");
if(handle_ == INVALID_HANDLE_VALUE) {
std::stringstream tapname;
tapname << USERMODEDEVICEDIR << adapterid << TAPSUFFIX;
handle_ = CreateFile(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: " << adapterid << " (" << adaptername << "): " << LogErrno(GetLastError());
throw std::runtime_error(msg.str());
}
}
actual_node_ = adapterid;
actual_name_ = adaptername;
int status = true;
if(!DeviceIoControl(handle_, TAP_IOCTL_SET_MEDIA_STATUS, &status, sizeof(status), &status, sizeof(status), &len, NULL)) {
CloseHandle(handle_);
std::stringstream msg;
msg << "Unable to set device media status: " << LogErrno(GetLastError());
throw std::runtime_error(msg.str());
}
if(ifcfg_lp != "" && ifcfg_rnmp != "")
do_ifconfig();
roverlapped_.hEvent = CreateEvent(NULL, TRUE, FALSE, NULL);
woverlapped_.hEvent = CreateEvent(NULL, TRUE, FALSE, NULL);
}
TunDevice::~TunDevice()
{
CloseHandle(handle_);
CloseHandle(roverlapped_.hEvent);
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()
{
}
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