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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 <string.h>
#include <sstream>
#include <fcntl.h>
#include <sys/ioctl.h>
#include <arpa/inet.h>
#include <errno.h>
#include <net/if.h>
#include <linux/ip.h>
#include <linux/if_ether.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) : conf_(dev_name, dev_type, ifcfg_lp, ifcfg_rnmp, 1400)
{
fd_ = ::open(DEFAULT_DEVICE, O_RDWR);
if(fd_ < 0) {
std::string msg("can't open device file (");
msg.append(DEFAULT_DEVICE);
msg.append("): ");
char buf[STERROR_TEXT_MAX];
buf[0] = 0;
strerror_r(errno, buf, STERROR_TEXT_MAX);
msg.append(buf);
throw std::runtime_error(msg);
}
struct ifreq ifr;
memset(&ifr, 0, sizeof(ifr));
if(conf_.type_ == TYPE_TUN) {
ifr.ifr_flags = IFF_TUN;
with_pi_ = true;
}
else if(conf_.type_ == TYPE_TAP) {
ifr.ifr_flags = IFF_TAP | IFF_NO_PI;
with_pi_ = false;
}
else
throw std::runtime_error("unable to recognize type of device (tun or 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 {
std::string msg("tun/tap device ioctl failed: ");
char buf[STERROR_TEXT_MAX];
buf[0] = 0;
strerror_r(errno, buf, STERROR_TEXT_MAX);
msg.append(buf);
throw std::runtime_error(msg);
}
if(ifcfg_lp && ifcfg_rnmp)
do_ifconfig();
}
TunDevice::~TunDevice()
{
if(fd_ > 0)
::close(fd_);
}
int TunDevice::fix_return(int ret, size_t pi_length)
{
if(ret < 0)
return ret;
return (static_cast<size_t>(ret) > pi_length ? (ret - pi_length) : 0);
}
int TunDevice::read(u_int8_t* buf, u_int32_t len)
{
if(fd_ < 0)
return -1;
if(with_pi_)
{
struct iovec iov[2];
struct tun_pi tpi;
iov[0].iov_base = &tpi;
iov[0].iov_len = sizeof(tpi);
iov[1].iov_base = buf;
iov[1].iov_len = len;
return(fix_return(::readv(fd_, iov, 2), sizeof(tpi)));
}
else
return(::read(fd_, buf, len));
}
int TunDevice::write(u_int8_t* buf, u_int32_t len)
{
if(fd_ < 0)
return -1;
if(with_pi_)
{
struct iovec iov[2];
struct tun_pi tpi;
struct iphdr *hdr = reinterpret_cast<struct iphdr *>(buf);
tpi.flags = 0;
if(hdr->version == 4)
tpi.proto = htons(ETH_P_IP);
else
tpi.proto = htons(ETH_P_IPV6);
iov[0].iov_base = &tpi;
iov[0].iov_len = sizeof(tpi);
iov[1].iov_base = buf;
iov[1].iov_len = len;
return(fix_return(::writev(fd_, iov, 2), sizeof(tpi)));
}
else
return(::write(fd_, buf, len));
}
const char* TunDevice::getActualName()
{
return actual_name_.c_str();
}
device_type_t TunDevice::getType()
{
return conf_.type_;
}
const char* TunDevice::getTypeString()
{
if(fd_ < 0)
return NULL;
switch(conf_.type_)
{
case TYPE_UNDEF: return "undef"; break;
case TYPE_TUN: return "tun"; break;
case TYPE_TAP: return "tap"; break;
}
return NULL;
}
void TunDevice::do_ifconfig()
{
std::ostringstream command;
command << "/sbin/ifconfig " << actual_name_ << " " << conf_.local_.toString();
if(conf_.type_ == TYPE_TUN)
command << " pointopoint ";
else
command << " netmask ";
command << conf_.remote_netmask_.toString() << " mtu " << conf_.mtu_;
system(command.str().c_str());
}
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