skyeye_net_tuntap.c

这是Skyeye 0.9 版本的源代码

//zzc:
#ifndef __CYGWIN__
/*
	skyeye_net_tuntap.c - tuntap net device file support functions
	Copyright (C) 2003 Skyeye Develop Group
	for help please send mail to <[e-mail]> 
	
	This program is free software; you can redistribute it and/or modify
	it under the terms of the GNU General Public License as published by
	the Free Software Foundation; either version 2 of the License, or
	(at your option) any later version.

	This program 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 this program; if not, write to the Free Software
	Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA 
 
*/

/*
 * 04/27/2003 	initial version
 *			chenyu <[e-mail]>
 */

#include <sys/ioctl.h>
#include "armdefs.h"

#ifdef __linux__
#include <net/if.h>
#include <linux/if_tun.h>
#endif

#ifdef __FreeBSD__
#include <sys/types.h>
#include <sys/socket.h>
#include <net/if.h>
#include <net/if_tun.h>
#include <fcntl.h>
#endif

#define DEBUG 0
#if DEBUG
#define DBG_PRINT(a...) fprintf(stderr, ##a)
#else
#define DBG_PRINT(a...)
#endif

#define DEFAULT_TUNTAP_IF_NAME "tap"
static name_index = 0;

int
tuntap_open (struct net_device *net_dev)
{
  int tapif_fd;
  struct ifreq ifr;
  char buf[128];
  char if_name[10];


  DBG_PRINT ("tapif_init begin\n");

#ifdef __linux__
  tapif_fd = open ("/dev/net/tun", O_RDWR);
  DBG_PRINT ("tapif_init: fd %d\n", tapif_fd);
  if (tapif_fd < 0)
    {
      perror ("tapif_init:open");
      printf
	("-----------------------------------------------------------\n");
      printf ("NOTICE: you should be root at first !!!\n");
      printf ("NOTICE: you should inmod linux kernel net driver tun.o!!!\n");
      printf
	("NOTICE: if you don't make device node, you should do commands:\n");
      printf ("NOTICE:    mkdir /dev/net; mknod /dev/net/tun c 10 200\n");
      printf ("NOTICE: now the net simulation function can not support!!!\n");
      printf ("NOTICE: Please read SkyEye.README and try again!!!\n");
      printf
	("-----------------------------------------------------------\n");
      return 1;
    }
#endif
#ifdef __FreeBSD__
    tapif_fd = open("/dev/tap", O_RDWR);
    DBG_PRINT("tapif_init: fd %d\n", tapif_fd);
    if(tapif_fd == -1) {
	      perror("tapif_init:open");
	      printf("-----------------------------------------------------------\n");
	      printf("NOTICE: You should run as root if you require network\n");
	      printf("NOTICE: load the kernel tap module with 'kldload if_tap'\n");
	      printf("NOTICE: and execute 'cat /dev/tap'. there should be a \n");
	      printf("NOTICE: device node under /dev/ (e.g. /dev/tap0).\n");
	      printf("-----------------------------------------------------------\n");
      return 1;
    }
#endif
#if !defined(__FreeBSD__)&&!defined(__linux__)
    printf("NOTICE: No network support for your OS(yet). Bugging out!\n");
    return 1;
#endif

  snprintf (if_name, sizeof (if_name), "%s%d", DEFAULT_TUNTAP_IF_NAME,
	    name_index);

#ifdef __linux__
  memset (&ifr, 0, sizeof (ifr));
  ifr.ifr_flags = IFF_TAP | IFF_NO_PI;
  strncpy (ifr.ifr_name, if_name, IFNAMSIZ);

  if (ioctl (tapif_fd, TUNSETIFF, (void *) &ifr) < 0)
    {
      printf ("tapif_init: icotl TUNSETIFF error");
      return 1;
    }
#endif

  snprintf (buf, sizeof (buf), "ifconfig %s inet %d.%d.%d.%d",
	    if_name, net_dev->hostip[0], net_dev->hostip[1],
	    net_dev->hostip[2], net_dev->hostip[3]);

  DBG_PRINT ("tapif_init: system(\"%s\");\n", buf);

  system (buf);
  net_dev->net_fd = tapif_fd;

  name_index++;

  DBG_PRINT ("tapif_init end\n");

  return 0;
}

int
tuntap_close (struct net_device *net_dev)
{
  close (net_dev->net_fd);
  return 0;
}

int
tuntap_read (struct net_device *net_dev, void *buf, size_t count)
{
  return read (net_dev->net_fd, buf, count);
}

int
tuntap_write (struct net_device *net_dev, void *buf, size_t count)
{
  return write (net_dev->net_fd, buf, count);
}

//zzc: #endif __CYGWIN__
#endif