source3/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 #include "../libcli/nbt/libnbt.h"
  27
  28 /****************************************************************************
  29 Load a lmhosts file.
  30 ****************************************************************************/
  31
  32 void load_lmhosts_file(const char *fname)
  33 {
  34         char *name = NULL;
  35         int name_type;
  36         struct sockaddr_storage ss;
  37         TALLOC_CTX *ctx = talloc_init("load_lmhosts_file");
  38         XFILE *fp = startlmhosts( fname );
  39
  40         if (!fp) {
  41                 DEBUG(2,("load_lmhosts_file: Can't open lmhosts file %s. Error was %s\n",
  42                         fname, strerror(errno)));
  43                 TALLOC_FREE(ctx);
  44                 return;
  45         }
  46
  47         while (getlmhostsent(ctx, fp, &name, &name_type, &ss) ) {
  48                 struct in_addr ipaddr;
  49                 struct subnet_record *subrec = NULL;
  50                 enum name_source source = LMHOSTS_NAME;
  51
  52                 if (ss.ss_family != AF_INET) {
  53                         TALLOC_FREE(name);
  54                         continue;
  55                 }
  56
  57                 ipaddr = ((struct sockaddr_in *)&ss)->sin_addr;
  58
  59                 /* We find a relevent subnet to put this entry on, then add it. */
  60                 /* Go through all the broadcast subnets and see if the mask matches. */
  61                 for (subrec = FIRST_SUBNET; subrec ; subrec = NEXT_SUBNET_EXCLUDING_UNICAST(subrec)) {
  62                         if(same_net_v4(ipaddr, subrec->bcast_ip, subrec->mask_ip))
  63                                 break;
  64                 }
  65
  66                 /* If none match add the name to the remote_broadcast_subnet. */
  67                 if(subrec == NULL)
  68                         subrec = remote_broadcast_subnet;
  69
  70                 if(name_type == -1) {
  71                         /* Add the (0) and (0x20) names directly into the namelist for this subnet. */
  72                         (void)add_name_to_subnet(subrec,name,0x00,(uint16)NB_ACTIVE,PERMANENT_TTL,source,1,&ipaddr);
  73                         (void)add_name_to_subnet(subrec,name,0x20,(uint16)NB_ACTIVE,PERMANENT_TTL,source,1,&ipaddr);
  74                 } else {
  75                         /* Add the given name type to the subnet namelist. */
  76                         (void)add_name_to_subnet(subrec,name,name_type,(uint16)NB_ACTIVE,PERMANENT_TTL,source,1,&ipaddr);
  77                 }
  78         }
  79
  80         TALLOC_FREE(ctx);
  81         endlmhosts(fp);
  82 }
  83
  84 /****************************************************************************
  85   Find a name read from the lmhosts file. We secretly check the names on
  86   the remote_broadcast_subnet as if the name was added to a regular broadcast
  87   subnet it will be found by normal name query processing.
  88 ****************************************************************************/
  89
  90 bool find_name_in_lmhosts(struct nmb_name *nmbname, struct name_record **namerecp)
  91 {
  92         struct name_record *namerec;
  93
  94         *namerecp = NULL;
  95
  96         if((namerec = find_name_on_subnet(remote_broadcast_subnet, nmbname, FIND_ANY_NAME))==NULL)
  97                 return False;
  98
  99         if(!NAME_IS_ACTIVE(namerec) || (namerec->data.source != LMHOSTS_NAME))
 100                 return False;
 101
 102         *namerecp = namerec;
 103         return True;
 104 }