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
  42
  43 TunDevice::TunDevice(const char* dev_name, const char* ifcfg_lp, const char* ifcfg_rnmp)
  44 {
  45   dev_ = NULL;
  46
  47 // init_tun (const char *dev,       /* --dev option */
  48 //               const char *dev_type,  /* --dev-type option */
  49 //               const char *ifconfig_local_parm,          /* --ifconfig parm 1 */
  50 //               const char *ifconfig_remote_netmask_parm, /* --ifconfig parm 2 */
  51 //               in_addr_t local_public,
  52 //               in_addr_t remote_public,
  53 //               const bool strict_warn,
  54 //               struct env_set *es)
  55
  56 // init_tun_post (struct tuntap *tt,
  57 //                    const struct frame *frame,
  58 //                    const struct tuntap_options *options)
  59
  60 // open_tun (const char *dev,
  61 //           const char *dev_type,
  62 //           const char *dev_node,
  63 //           bool ipv6,
  64 //           struct tuntap *tt)
  65
  66 // -------------------------------------------
  67
  68 // c->c1.tuntap = init_tun (c->options.dev,
  69 //                          c->options.dev_type,
  70 //                          c->options.ifconfig_local,
  71 //                          c->options.ifconfig_remote_netmask,
  72 //                          addr_host (&c->c1.link_socket_addr.local),
  73 //                          addr_host (&c->c1.link_socket_addr.remote),
  74 //                          !c->options.ifconfig_nowarn,
  75 //                          c->c2.es);
  76
  77 // init_tun_post (c->c1.tuntap,
  78 //                &c->c2.frame,
  79 //                &c->options.tuntap_options);
  80
  81 // open_tun (c->options.dev,
  82 //           c->options.dev_type,
  83 //           c->options.dev_node,
  84 //           c->options.tun_ipv6,
  85 //           c->c1.tuntap);
  86
  87
  88
  89   in_addr_t lp, rp;
  90
  91 //   lp = inet_addr("192.168.198.1");
  92 //   rp = inet_addr("192.168.199.1");
  93
  94   dev_ = init_tun(dev_name, NULL, ifcfg_lp, ifcfg_rnmp, lp, rp, 0, NULL);
  95       //init_tun_post(dev_, NULL, NULL);
  96   if(!dev_)
  97     throw std::runtime_error("can't init tun/tap device");
  98
  99   open_tun (dev_name, NULL, NULL, false, dev_);
 100   do_ifconfig(dev_, dev_->actual_name, 1500, NULL);
 101 }
 102
 103 TunDevice::~TunDevice()
 104 {
 105   if(dev_)
 106     close_tun(dev_);
 107 }
 108
 109 short TunDevice::read(Buffer& buf)
 110 {
 111   if(!dev_)
 112     return -1;
 113
 114   struct pollfd pfd[1];
 115   pfd[0].fd = tun_event_handle(dev_);
 116 //  pfd[0].events = POLLIN | POLLRDNORM | POLLRDBAND | POLLPRI | POLLOUT | POLLWRNORM | POLLWRBAND | POLLERR | POLLHUP | POLLNVAL;
 117   pfd[0].events = POLLIN | POLLRDNORM | POLLRDBAND | POLLPRI;
 118   poll(pfd, 1, -1);
 119   return pfd[0].revents;//read_tun(dev_, buf, buf.getLength());
 120 }
 121
 122 int TunDevice::write(Buffer& buf)
 123 {
 124   if(!dev_)
 125     return -1;
 126
 127   return write_tun(dev_, buf, buf.getLength());
 128 }
 129
 130 char* TunDevice::getActualName()
 131 {
 132   if(!dev_)
 133     return NULL;
 134
 135   return dev_->actual_name;
 136 }
 137
 138 char* TunDevice::getType()
 139 {
 140   if(!dev_)
 141     return NULL;
 142
 143   switch(dev_->type)
 144   {
 145   case DEV_TYPE_UNDEF: return "undef"; break;
 146   case DEV_TYPE_TUN: return "tun"; break;
 147   case DEV_TYPE_TAP: return "tap"; break;
 148   }
 149   return NULL;
 150 }