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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 anytun.org <satp@wirdorange.org>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2
* as published by the Free Software Foundation.
*
* 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 (see the file COPYING included with this
* distribution); if not, write to the Free Software Foundation, Inc.,
* 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include <fcntl.h>
#include <net/if.h>
#include <sys/ioctl.h>
#include <linux/if_tun.h>
#define DEFAULT_DEVICE "/dev/net/tun"
#include "tunDevice.h"
#include "threadUtils.hpp"
TunDevice::TunDevice(const char* dev_name, const char* dev_type, const char* ifcfg_lp, const char* ifcfg_rnmp)
{
fd_ = -1;
type_ = TYPE_UNDEF;
fd_ = ::open(DEFAULT_DEVICE, O_RDWR | O_NONBLOCK);
if(fd_ < 0)
throw std::runtime_error("can't init tun/tap device");
struct ifreq ifr;
memset(&ifr, 0, sizeof(ifr));
// tun device
ifr.ifr_flags = IFF_TUN;
type_ = TYPE_TUN;
// tap device
// ifr.ifr_flags = IFF_TAP | IFF_NO_PI;
// type_ = TYPE_TAP;
if(dev_name)
strncpy(ifr.ifr_name, dev_name, IFNAMSIZ);
if(!ioctl(fd_, TUNSETIFF, &ifr)) {
actual_name_ = ifr.ifr_name;
} else if(!ioctl(fd_, (('T' << 8) | 202), &ifr)) {
actual_name_ = ifr.ifr_name;
} else
throw std::runtime_error("can't init tun/tap device");
}
TunDevice::~TunDevice()
{
if(fd_ > 0)
::close(fd_);
}
short TunDevice::read(u_int8_t* buf, u_int32_t len)
{
if(fd_ < 0)
return -1;
return ::read(fd_, buf, len);
}
int TunDevice::write(u_int8_t* buf, u_int32_t len)
{
if(fd_ < 0)
return -1;
return ::write(fd_, buf, len);
}
const char* TunDevice::getActualName()
{
return actual_name_.c_str();
}
u_int32_t TunDevice::getType()
{
return type_;
}
const char* TunDevice::getTypeString()
{
if(fd_ < 0)
return NULL;
switch(type_)
{
case TYPE_UNDEF: return "undef"; break;
case TYPE_TUN: return "tun"; break;
case TYPE_TAP: return "tap"; break;
}
return NULL;
}
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