tunDevice.cpp

   1 /*
   2  *  anytun
   3  *
   4  *  The secure anycast tunneling protocol (satp) defines a protocol used
   5  *  for communication between any combination of unicast and anycast
   6  *  tunnel endpoints.  It has less protocol overhead than IPSec in Tunnel
   7  *  mode and allows tunneling of every ETHER TYPE protocol (e.g.
   8  *  ethernet, ip, arp ...). satp directly includes cryptography and
   9  *  message authentication based on the methodes used by SRTP.  It is
  10  *  intended to deliver a generic, scaleable and secure solution for
  11  *  tunneling and relaying of packets of any protocol.
  12  *
  13  *
  14  *  Copyright (C) 2007 anytun.org <satp@wirdorange.org>
  15  *
  16  *  This program is free software; you can redistribute it and/or modify
  17  *  it under the terms of the GNU General Public License version 2
  18  *  as published by the Free Software Foundation.
  19  *
  20  *  This program is distributed in the hope that it will be useful,
  21  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  22  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  23  *  GNU General Public License for more details.
  24  *
  25  *  You should have received a copy of the GNU General Public License
  26  *  along with this program (see the file COPYING included with this
  27  *  distribution); if not, write to the Free Software Foundation, Inc.,
  28  *  59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  29  */
  30
  31 #include <stdexcept>
  32 #include <poll.h>
  33
  34 extern "C" {
  35 #include "openvpn/config.h"
  36 #include "openvpn/syshead.h"
  37 #include "openvpn/tun.h"
  38 }
  39
  40 #include "tunDevice.h"
  41 #include "threadUtils.hpp"
  42
  43
  44 TunDevice::TunDevice(const char* dev_name,const char* dev_type, const char* ifcfg_lp, const char* ifcfg_rnmp)
  45 {
  46   dev_ = NULL;
  47
  48 // init_tun (const char *dev,       /* --dev option */
  49 //               const char *dev_type,  /* --dev-type option */
  50 //               const char *ifconfig_local_parm,          /* --ifconfig parm 1 */
  51 //               const char *ifconfig_remote_netmask_parm, /* --ifconfig parm 2 */
  52 //               in_addr_t local_public,
  53 //               in_addr_t remote_public,
  54 //               const bool strict_warn,
  55 //               struct env_set *es)
  56
  57 // init_tun_post (struct tuntap *tt,
  58 //                    const struct frame *frame,
  59 //                    const struct tuntap_options *options)
  60
  61 // open_tun (const char *dev,
  62 //           const char *dev_type,
  63 //           const char *dev_node,
  64 //           bool ipv6,
  65 //           struct tuntap *tt)
  66
  67 // -------------------------------------------
  68
  69 // c->c1.tuntap = init_tun (c->options.dev,
  70 //                          c->options.dev_type,
  71 //                          c->options.ifconfig_local,
  72 //                          c->options.ifconfig_remote_netmask,
  73 //                          addr_host (&c->c1.link_socket_addr.local),
  74 //                          addr_host (&c->c1.link_socket_addr.remote),
  75 //                          !c->options.ifconfig_nowarn,
  76 //                          c->c2.es);
  77
  78 // init_tun_post (c->c1.tuntap,
  79 //                &c->c2.frame,
  80 //                &c->options.tuntap_options);
  81
  82 // open_tun (c->options.dev,
  83 //           c->options.dev_type,
  84 //           c->options.dev_node,
  85 //           c->options.tun_ipv6,
  86 //           c->c1.tuntap);
  87
  88
  89
  90   in_addr_t lp, rp;
  91
  92 //   lp = inet_addr("192.168.198.1");
  93 //   rp = inet_addr("192.168.199.1");
  94
  95   dev_ = init_tun(dev_name, dev_type, ifcfg_lp, ifcfg_rnmp, lp, rp, 0, NULL);
  96   struct frame frame; // just for win32
  97   struct tuntap_options options; // win32 & linux
  98   options.txqueuelen = 100; // just for linux
  99   init_tun_post(dev_, &frame, &options);
 100   if(!dev_)
 101     throw std::runtime_error("can't init tun/tap device");
 102
 103   open_tun (dev_name, NULL, NULL, false, dev_);
 104   do_ifconfig(dev_, dev_->actual_name, 1000, NULL);
 105 }
 106
 107 TunDevice::~TunDevice()
 108 {
 109   if(dev_)
 110     close_tun(dev_);
 111 }
 112
 113 short TunDevice::read(u_int8_t* buf, u_int32_t len)
 114 {
 115   if(!dev_)
 116     return -1;
 117
 118   struct pollfd pfd[1];
 119   pfd[0].fd = tun_event_handle(dev_);
 120   pfd[0].events = POLLIN | POLLPRI;
 121   pfd[0].revents = 0;
 122   poll(pfd, 1, -1);
 123   Lock lock(io_mutex_);
 124   return read_tun(dev_, buf, len);
 125 }
 126
 127 int TunDevice::write(u_int8_t* buf, u_int32_t len)
 128 {
 129   if(!dev_)
 130     return -1;
 131   Lock lock(io_mutex_);
 132   return write_tun(dev_, buf, len);
 133 }
 134
 135 char* TunDevice::getActualName()
 136 {
 137   if(!dev_)
 138     return NULL;
 139
 140   return dev_->actual_name;
 141 }
 142
 143 u_int32_t TunDevice::getType()
 144 {
 145   if(!dev_)
 146     return TYPE_UNDEF;
 147
 148   switch(dev_->type)
 149   {
 150   case DEV_TYPE_TUN: return TYPE_TUN;
 151   case DEV_TYPE_TAP: return TYPE_TAP;
 152   }
 153   return TYPE_UNDEF;
 154 }
 155
 156 const char* TunDevice::getTypeString()
 157 {
 158   if(!dev_)
 159     return NULL;
 160
 161   switch(dev_->type)
 162   {
 163   case DEV_TYPE_UNDEF: return "undef"; break;
 164   case DEV_TYPE_TUN: return "tun"; break;
 165   case DEV_TYPE_TAP: return "tap"; break;
 166   }
 167   return NULL;
 168 }