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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 <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"
#include "log.h"
#include "anytunError.h"
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)
{
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
AnytunError::throwErr() << "unable to recognize type of device (tun or tap)";
if(dev_name != "")
strncpy(ifr.ifr_name, dev_name.c_str(), IFNAMSIZ);
fd_ = ::open(DEFAULT_DEVICE, O_RDWR);
if(fd_ < 0)
AnytunError::throwErr() << "can't open device file (" << DEFAULT_DEVICE << "): " << AnytunErrno(errno);
if(!ioctl(fd_, TUNSETIFF, &ifr)) {
actual_name_ = ifr.ifr_name;
} else if(!ioctl(fd_, (('T' << 8) | 202), &ifr)) {
actual_name_ = ifr.ifr_name;
} else {
::close(fd_);
AnytunError::throwErr() << "tun/tap device ioctl failed: " << AnytunErrno(errno);
}
actual_node_ = DEFAULT_DEVICE;
if(ifcfg_addr != "")
do_ifconfig();
}
TunDevice::~TunDevice()
{
if(fd_ > 0)
::close(fd_);
}
int TunDevice::fix_return(int ret, size_t pi_length) const
{
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) const
{
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) const
{
if(fd_ < 0)
return -1;
if(!buf)
return 0;
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));
}
void TunDevice::init_post()
{
// nothing to be done here
}
void TunDevice::do_ifconfig()
{
std::ostringstream command;
command << "/sbin/ifconfig " << actual_name_ << " " << conf_.addr_.toString()
<< " netmask " << conf_.netmask_.toString() << " mtu " << conf_.mtu_;
int result = system(command.str().c_str());
if(result == -1)
cLog.msg(Log::PRIO_ERROR) << "Execution of ifconfig failed: " << AnytunErrno(errno);
else {
if(WIFEXITED(result))
cLog.msg(Log::PRIO_NOTICE) << "ifconfig returned " << WEXITSTATUS(result);
else if(WIFSIGNALED(result))
cLog.msg(Log::PRIO_NOTICE) << "ifconfig terminated after signal " << WTERMSIG(result);
else
cLog.msg(Log::PRIO_ERROR) << "Execution of ifconfig: unkown error";
}
}
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