/* * 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 * * 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 . */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include "tunDevice.h" #include "threadUtils.hpp" #define DEVICE_FILE_MAX 255 #include 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) { std::string device_file = "/dev/"; bool dynamic = true; if(dev_name != "") { device_file.append(dev_name); dynamic = false; } else if(conf_.type_ == TYPE_TUN) { device_file.append("tun"); actual_name_ = "tun"; } else if(conf_.type_ == TYPE_TAP) { device_file.append("tap"); actual_name_ = "tap"; } else throw std::runtime_error("unable to recognize type of device (tun or tap)"); u_int32_t dev_id=0; if(dynamic) { for(; dev_id <= DEVICE_FILE_MAX; ++dev_id) { std::ostringstream ds; ds << device_file; ds << dev_id; fd_ = ::open(ds.str().c_str(), O_RDWR); if(fd_ >= 0) break; } } else fd_ = ::open(device_file.c_str(), O_RDWR); if(fd_ < 0) { std::string msg; if(dynamic) msg = "can't open device file dynamically: no unused node left"; else { msg = "can't open device file ("; msg.append(device_file); 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); } if(dynamic) { std::stringstream s; s << actual_name_; s << dev_id; actual_name_ = s.str(); } else actual_name_ = dev_name; init_post(); if(ifcfg_lp != "" && ifcfg_rnmp != "") do_ifconfig(); } TunDevice::~TunDevice() { if(fd_ > 0) ::close(fd_); } #if defined(__GNUC__) && defined(__OpenBSD__) void TunDevice::init_post() { with_pi_ = true; if(conf_.type_ == TYPE_TAP) with_pi_ = false; struct tuninfo ti; if (ioctl(fd_, TUNGIFINFO, &ti) < 0) throw std::runtime_error("can't enable multicast for interface"); ti.flags |= IFF_MULTICAST; if (ioctl(fd_, TUNSIFINFO, &ti) < 0) throw std::runtime_error("can't enable multicast for interface"); } #elif defined(__GNUC__) && defined(__FreeBSD__) void TunDevice::init_post() { with_pi_ = true; if(conf_.type_ == TYPE_TAP) with_pi_ = false; int arg = 0; ioctl(fd_, TUNSLMODE, &arg); arg = 1; ioctl(fd_, TUNSIFHEAD, &arg); } #elif defined(__GNUC__) && defined(__NetBSD__) void TunDevice::init_post() { with_pi_ = false; int arg = IFF_POINTOPOINT|IFF_MULTICAST; ioctl(fd_, TUNSIFMODE, &arg); arg = 0; ioctl(fd_, TUNSLMODE, &arg); } #else #error This Device works just for OpenBSD, FreeBSD or NetBSD #endif int TunDevice::fix_return(int ret, size_t pi_length) { if(ret < 0) return ret; return (static_cast(ret) > type_length ? (ret - type_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]; u_int32_t type; iov[0].iov_base = &type; iov[0].iov_len = sizeof(type); iov[1].iov_base = buf; iov[1].iov_len = len; return(fix_return(::readv(fd_, iov, 2), sizeof(type))); } 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]; u_int32_t type; struct ip *hdr = reinterpret_cast(buf); type = 0; if(hdr->ip_v == 4) type = htonl(AF_INET); else type = htonl(AF_INET6); iov[0].iov_base = &type; iov[0].iov_len = sizeof(type); iov[1].iov_base = buf; iov[1].iov_len = len; return(fix_return(::writev(fd_, iov, 2), sizeof(type))); } else return(::write(fd_, buf, len)); } void TunDevice::do_ifconfig() { std::ostringstream command; command << "/sbin/ifconfig " << actual_name_ << " " << conf_.local_.toString(); if(conf_.type_ == TYPE_TAP) command << " netmask "; else command << " "; command << conf_.remote_netmask_.toString() << " mtu " << conf_.mtu_; if(conf_.type_ == TYPE_TUN) command << " netmask 255.255.255.255 up"; else { #if defined(__GNUC__) && defined(__OpenBSD__) command << " link0"; #elif defined(__GNUC__) && defined(__FreeBSD__) command << " up"; #elif defined(__GNUC__) && defined(__NetBSD__) command << ""; #else #error This Device works just for OpenBSD, FreeBSD or NetBSD #endif } system(command.str().c_str()); }