/*
 *  ľAnytun
 *
 *  ľAnytun is a tiny implementation of SATP. Unlike Anytun which is a full
 *  featured implementation ľAnytun has no support for multiple connections
 *  or synchronisation. It is a small single threaded implementation intended
 *  to act as a client on small platforms.
 *  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 Christian Pointner <equinox@anytun.org>
 *
 *  This file is part of ľAnytun.
 *
 *  ľAnytun 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.
 *
 *  ľAnytun 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 ľAnytun. If not, see <http://www.gnu.org/licenses/>.
 */

#include "datatypes.h"

#include "tun.h"

#include "tun_helper.h"

#include "log.h"

void tun_init(tun_device_t** dev, const char* dev_name, const char* dev_type, const char* ifcfg_lp, const char* ifcfg_rnmp)
{
  if(!dev) 
    return;
 
  *dev = malloc(sizeof(tun_device_t));
  if(!*dev) 
    return;

  tun_conf(*dev, dev_name, dev_type, ifcfg_lp, ifcfg_rnmp, 1400);


  if(ifcfg_lp && ifcfg_rnmp)
    tun_do_ifconfig(*dev);
}

void tun_init_post(tun_device_t* dev)
{
// nothing yet
}

void tun_close(tun_device_t** dev)
{
  if(!dev || !(*dev))
    return;

  if((*dev)->fd_ > 0)
    close((*dev)->fd_);

  if((*dev)->actual_name_)
    free((*dev)->actual_name_);

  if((*dev)->local_)
    free((*dev)->local_);

  if((*dev)->remote_netmask_)
    free((*dev)->remote_netmask_);

  free(*dev);
  *dev = NULL;
}

int tun_read(tun_device_t* dev, u_int8_t* buf, u_int32_t len)
{
/*   if(!dev || dev->fd_ < 0) */
/*     return -1; */

/*   if(dev->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(tun_fix_return(readv(dev->fd_, iov, 2), sizeof(tpi))); */
/*   } */
/*   else */
/*     return(read(dev->fd_, buf, len)); */
  return -1;
}

int tun_write(tun_device_t* dev, u_int8_t* buf, u_int32_t len)
{
/*   if(!dev || dev->fd_ < 0) */
/*     return -1; */

/*   if(dev->with_pi_) */
/*   { */
/*     struct iovec iov[2]; */
/*     struct tun_pi tpi; */
/*     struct iphdr *hdr = (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(tun_fix_return(writev(dev->fd_, iov, 2), sizeof(tpi))); */
/*   } */
/*   else */
/*     return(write(dev->fd_, buf, len)); */
  return -1;
}

void tun_do_ifconfig(tun_device_t* dev)
{
/*   if(!dev || !dev->actual_name_ || !dev->local_ || !dev->remote_netmask_) */
/*     return; */

/*   char* command = NULL; */
/*   if(dev->type_ == TYPE_TUN) */
/*     asprintf(&command, "/sbin/ifconfig %s %s pointopoint %s mtu %d", dev->actual_name_, dev->local_, dev->remote_netmask_, dev->mtu_); */
/*   else */
/*     asprintf(&command, "/sbin/ifconfig %s %s netmask %s mtu %d", dev->actual_name_, dev->local_, dev->remote_netmask_, dev->mtu_); */

/*   if(!command) { */
/*     log_printf(ERR, "Execution of ifconfig failed"); */
/*     return; */
/*   } */

/*   int result = system(command); */
/*   if(result == -1) */
/*     log_printf(ERR, "Execution of ifconfig failed"); */
/*   else */
/*     log_printf(NOTICE, "ifconfig returned %d", WEXITSTATUS(result)); */

/*   free(command); */
}