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 3 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, see <http://www.gnu.org/licenses/>.
  18
  19    Revision History:
  20
  21    Handle lmhosts file reading.
  22
  23 */
  24
  25 #include "includes.h"
  26
  27 /****************************************************************************
  28 Load a lmhosts file.
  29 ****************************************************************************/
  30
  31 void load_lmhosts_file(const char *fname)
  32 {
  33         char *name = NULL;
  34         int name_type;
  35         struct sockaddr_storage ss;
  36         TALLOC_CTX *ctx = talloc_init("load_lmhosts_file");
  37         XFILE *fp = startlmhosts( fname );
  38
  39         if (!fp) {
  40                 DEBUG(2,("load_lmhosts_file: Can't open lmhosts file %s. Error was %s\n",
  41                         fname, strerror(errno)));
  42                 TALLOC_FREE(ctx);
  43                 return;
  44         }
  45
  46         while (getlmhostsent(ctx, fp, &name, &name_type, &ss) ) {
  47                 struct in_addr ipaddr;
  48                 struct subnet_record *subrec = NULL;
  49                 enum name_source source = LMHOSTS_NAME;
  50
  51                 if (ss.ss_family != AF_INET) {
  52                         TALLOC_FREE(name);
  53                         continue;
  54                 }
  55
  56                 ipaddr = ((struct sockaddr_in *)&ss)->sin_addr;
  57
  58                 /* We find a relevent subnet to put this entry on, then add it. */
  59                 /* Go through all the broadcast subnets and see if the mask matches. */
  60                 for (subrec = FIRST_SUBNET; subrec ; subrec = NEXT_SUBNET_EXCLUDING_UNICAST(subrec)) {
  61                         if(same_net_v4(ipaddr, subrec->bcast_ip, subrec->mask_ip))
  62                                 break;
  63                 }
  64
  65                 /* If none match add the name to the remote_broadcast_subnet. */
  66                 if(subrec == NULL)
  67                         subrec = remote_broadcast_subnet;
  68
  69                 if(name_type == -1) {
  70                         /* Add the (0) and (0x20) names directly into the namelist for this subnet. */
  71                         (void)add_name_to_subnet(subrec,name,0x00,(uint16)NB_ACTIVE,PERMANENT_TTL,source,1,&ipaddr);
  72                         (void)add_name_to_subnet(subrec,name,0x20,(uint16)NB_ACTIVE,PERMANENT_TTL,source,1,&ipaddr);
  73                 } else {
  74                         /* Add the given name type to the subnet namelist. */
  75                         (void)add_name_to_subnet(subrec,name,name_type,(uint16)NB_ACTIVE,PERMANENT_TTL,source,1,&ipaddr);
  76                 }
  77         }
  78
  79         TALLOC_FREE(ctx);
  80         endlmhosts(fp);
  81 }
  82
  83 /****************************************************************************
  84   Find a name read from the lmhosts file. We secretly check the names on
  85   the remote_broadcast_subnet as if the name was added to a regular broadcast
  86   subnet it will be found by normal name query processing.
  87 ****************************************************************************/
  88
  89 bool find_name_in_lmhosts(struct nmb_name *nmbname, struct name_record **namerecp)
  90 {
  91         struct name_record *namerec;
  92
  93         *namerecp = NULL;
  94
  95         if((namerec = find_name_on_subnet(remote_broadcast_subnet, nmbname, FIND_ANY_NAME))==NULL)
  96                 return False;
  97
  98         if(!NAME_IS_ACTIVE(namerec) || (namerec->data.source != LMHOSTS_NAME))
  99                 return False;
 100
 101         *namerecp = namerec;
 102         return True;
 103 }