/*
 * ipforward value get function for solaris.
 * Copyright (C) 1997 Kunihiro Ishiguro
 *
 * This file is part of GNU Zebra.
 *
 * GNU Zebra 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, or (at your option) any
 * later version.
 *
 * GNU Zebra 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 GNU Zebra; see the file COPYING.  If not, write to the Free
 * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
 * 02111-1307, USA.  
 */

#include <zebra.h>
#include "log.h"
#include "prefix.h"

#include "privs.h"
#include "zebra/ipforward.h"

/*
** Solaris should define IP_DEV_NAME in <inet/ip.h>, but we'll save
** configure.in changes for another day.  We can use the same device
** for both IPv4 and IPv6.
*/
/* #include <inet/ip.h> */
#ifndef IP_DEV_NAME
#define IP_DEV_NAME "/dev/ip"
#endif


extern struct zebra_privs_t zserv_privs;

/* This is a limited ndd style function that operates one integer
** value only.  Errors return -1. ND_SET commands return 0 on
** success. ND_GET commands return the value on success (which could
** be -1 and be confused for an error).  The parameter is the string
** name of the parameter being referenced.
*/

static int
solaris_nd(const int cmd, const char* parameter, const int value)
{
#define ND_BUFFER_SIZE 1024
  int fd;
  char nd_buf[ND_BUFFER_SIZE];
  struct strioctl strioctl;
  const char* device = IP_DEV_NAME;
  int retval;
  memset(nd_buf, '\0', ND_BUFFER_SIZE);
  /*
  ** ND_SET takes a NULL delimited list of strings further terminated
  ** buy a NULL.  ND_GET returns a list in a similar layout, although
  ** here we only use the first result.
  */
  if (cmd == ND_SET)
    snprintf(nd_buf, ND_BUFFER_SIZE, "%s%c%d%c", parameter, '\0', value,'\0');
  else if (cmd == ND_GET)
    snprintf(nd_buf, ND_BUFFER_SIZE, "%s", parameter);
  else {
    zlog_err("internal error - inappropriate command given to "
             "solaris_nd()%s:%d", __FILE__, __LINE__);
    return -1;
  }

  strioctl.ic_cmd = cmd;
  strioctl.ic_timout = 0;
  strioctl.ic_len = ND_BUFFER_SIZE;
  strioctl.ic_dp = nd_buf;
  
  if ( zserv_privs.change (ZPRIVS_RAISE) )
       zlog_err ("solaris_nd: Can't raise privileges");
  if ((fd = open (device, O_RDWR)) < 0) 
    {
      zlog_warn("failed to open device %s - %s", device, safe_strerror(errno));
      if ( zserv_privs.change (ZPRIVS_LOWER) )
        zlog_err ("solaris_nd: Can't lower privileges");
      return -1;
    }
  if (ioctl (fd, I_STR, &strioctl) < 0) 
    {
      int save_errno = errno;
      if ( zserv_privs.change (ZPRIVS_LOWER) )
        zlog_err ("solaris_nd: Can't lower privileges");
      close (fd);
      zlog_warn("ioctl I_STR failed on device %s - %s",
      		device, safe_strerror(save_errno));
      return -1;
    }
  close(fd);
  if ( zserv_privs.change (ZPRIVS_LOWER) )
         zlog_err ("solaris_nd: Can't lower privileges");
  
  if (cmd == ND_GET) 
    {
      errno = 0;
      retval = atoi(nd_buf);
      if (errno) 
        {
          zlog_warn("failed to convert returned value to integer - %s",
                    safe_strerror(errno));
          retval = -1;
        }
    } 
  else 
    {
      retval = 0;
    }
  return retval;
}

static int
solaris_nd_set(const char* parameter, const int value) {
  return solaris_nd(ND_SET, parameter, value);
}
static int
solaris_nd_get(const char* parameter) {
  return solaris_nd(ND_GET, parameter, 0);
}
int
ipforward(void)
{
  return solaris_nd_get("ip_forwarding");
}

int
ipforward_on (void)
{
  (void) solaris_nd_set("ip_forwarding", 1);
  return ipforward();
}

int
ipforward_off (void)
{
  (void) solaris_nd_set("ip_forwarding", 0);
  return ipforward();
}
#ifdef HAVE_IPV6
int ipforward_ipv6(void)
{
  return solaris_nd_get("ip6_forwarding");
}
int
ipforward_ipv6_on (void)
{
  (void) solaris_nd_set("ip6_forwarding", 1);
  return ipforward_ipv6();
}
int
ipforward_ipv6_off (void)
{
  (void) solaris_nd_set("ip6_forwarding", 0);
  return ipforward_ipv6();
}
#endif /* HAVE_IPV6 */