nis.c

linux下远程启动服务/bootp服务器源代码

/*
 *
 *   bootpd_nis: simple BOOTP server with NIS maps support
 *   Copyright (C) 2005 <[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
 *
 *
 *  $Id: nis.c,v 1.3 2005/03/02 21:10:50 bfleisch Exp $
 *
 */


#include "nis.h"


host_info*
get_host_info_nis(const char* hwaddr)
{

  int err;
  char *nisdomain;
  char hw[3 * 6];
  int i;
  char *tmp;
  int tmp_len;
  static host_info hinfo;
  char ip[4*3+3+1];
  
  
  memset(&hinfo, 0, sizeof(hinfo));
  
  err = yp_get_default_domain (&nisdomain);
  if (err || !nisdomain)
  {
    log_msg(LOG_ERR, "NIS domain undefined");    
    return NULL;
  }
  
  if (g_flags & F_DEBUG)
      log_msg(LOG_DEBUG, "NIS domain name : %s", nisdomain);

  memset (hw, 0, 3 * 6);
  for (i = 0; i < 6; i++)
    sprintf (hw + strlen (hw), "%0x:", (unsigned char)hwaddr[i]);

  hw[strlen (hw) - 1] = '\0';
  
  
  if ( g_flags & F_DEBUG)
      log_msg(LOG_DEBUG, "Querying NIS table %s for %s", ETHERS_NISTABLE, hw);

  err =  yp_match (nisdomain, ETHERS_NISTABLE, hw, strlen (hw), &tmp, &tmp_len);
  if (err ||!tmp)
  {
    log_msg(LOG_NOTICE, "%s: no such key in %s (err=%s)\n", hw, ETHERS_NISTABLE, yperr_string(err));
    if (tmp) free(tmp);
    return NULL;
  }

  sscanf (tmp, "%*s %256s", hinfo.hostname);
  free(tmp);  

  if ( g_flags & F_DEBUG)
      log_msg(LOG_DEBUG, "Querying NIS table %s for %s ", HOSTS_NISTABLE, hinfo.hostname );
  
  err = yp_match (nisdomain, HOSTS_NISTABLE, hinfo.hostname, strlen (hinfo.hostname), &tmp, &tmp_len);

  
  if (err || ! tmp)
  {
    log_msg (LOG_NOTICE, "%s: no such key in %s (err=%s)\n", hinfo.hostname, HOSTS_NISTABLE, yperr_string(err));
    if (tmp) free(tmp);
    return NULL;
  }

  sscanf(tmp, "%16s", ip);
  
  free(tmp);
  
  log_msg(LOG_INFO, "HW=%s, HOST=%s, IP=%s\n", hw, hinfo.hostname, ip);

  hinfo.addr.s_addr = inet_addr(ip);
  return &hinfo;  
}