source/nmbd/nmbd_lmhosts.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3    NBT netbios routines and daemon - version 2
   4    Copyright (C) Jeremy Allison 1994-1998
   5
   6    This program is free software; you can redistribute it and/or modify
   7    it under the terms of the GNU General Public License as published by
   8    the Free Software Foundation; either version 2 of the License, or
   9    (at your option) any later version.
  10
  11    This program is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14    GNU General Public License for more details.
  15
  16    You should have received a copy of the GNU General Public License
  17    along with this program; if not, write to the Free Software
  18    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  19
  20    Revision History:
  21
  22    Handle lmhosts file reading.
  23
  24 */
  25
  26 #include "includes.h"
  27
  28 /****************************************************************************
  29 Load a lmhosts file.
  30 ****************************************************************************/
  31 void load_lmhosts_file(char *fname)
  32 {
  33   pstring name;
  34   int name_type;
  35   struct in_addr ipaddr;
  36   XFILE *fp = startlmhosts( fname );
  37
  38   if (!fp) {
  39     DEBUG(2,("load_lmhosts_file: Can't open lmhosts file %s. Error was %s\n",
  40              fname, strerror(errno)));
  41     return;
  42   }
  43
  44   while (getlmhostsent(fp, name, &name_type, &ipaddr) )
  45   {
  46     struct subnet_record *subrec = NULL;
  47     enum name_source source = LMHOSTS_NAME;
  48
  49     /* We find a relevent subnet to put this entry on, then add it. */
  50     /* Go through all the broadcast subnets and see if the mask matches. */
  51     for (subrec = FIRST_SUBNET; subrec ; subrec = NEXT_SUBNET_EXCLUDING_UNICAST(subrec))
  52     {
  53       if(same_net(ipaddr, subrec->bcast_ip, subrec->mask_ip))
  54         break;
  55     }
  56
  57     /* If none match add the name to the remote_broadcast_subnet. */
  58     if(subrec == NULL)
  59       subrec = remote_broadcast_subnet;
  60
  61     if(name_type == -1)
  62     {
  63       /* Add the (0) and (0x20) names directly into the namelist for this subnet. */
  64       (void)add_name_to_subnet(subrec,name,0x00,(uint16)NB_ACTIVE,PERMANENT_TTL,source,1,&ipaddr);
  65       (void)add_name_to_subnet(subrec,name,0x20,(uint16)NB_ACTIVE,PERMANENT_TTL,source,1,&ipaddr);
  66     }
  67     else
  68     {
  69       /* Add the given name type to the subnet namelist. */
  70       (void)add_name_to_subnet(subrec,name,name_type,(uint16)NB_ACTIVE,PERMANENT_TTL,source,1,&ipaddr);
  71     }
  72   }
  73
  74   endlmhosts(fp);
  75 }
  76
  77 /****************************************************************************
  78   Find a name read from the lmhosts file. We secretly check the names on
  79   the remote_broadcast_subnet as if the name was added to a regular broadcast
  80   subnet it will be found by normal name query processing.
  81 ****************************************************************************/
  82
  83 BOOL find_name_in_lmhosts(struct nmb_name *nmbname, struct name_record **namerecp)
  84 {
  85   struct name_record *namerec;
  86
  87   *namerecp = NULL;
  88
  89   if((namerec = find_name_on_subnet(remote_broadcast_subnet, nmbname,
  90                                  FIND_ANY_NAME))==NULL)
  91     return False;
  92
  93   if(!NAME_IS_ACTIVE(namerec) || (namerec->data.source != LMHOSTS_NAME))
  94     return False;
  95
  96   *namerecp = namerec;
  97   return True;
  98 }