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 #include "nmbd/nmbd.h"
  28
  29 /****************************************************************************
  30 Load a lmhosts file.
  31 ****************************************************************************/
  32
  33 void load_lmhosts_file(const char *fname)
  34 {
  35         char *name = NULL;
  36         int name_type;
  37         struct sockaddr_storage ss;
  38         TALLOC_CTX *ctx = talloc_init("load_lmhosts_file");
  39         FILE *fp = startlmhosts( fname );
  40
  41         if (!fp) {
  42                 DEBUG(2,("load_lmhosts_file: Can't open lmhosts file %s. Error was %s\n",
  43                         fname, strerror(errno)));
  44                 TALLOC_FREE(ctx);
  45                 return;
  46         }
  47
  48         while (getlmhostsent(ctx, fp, &name, &name_type, &ss) ) {
  49                 struct in_addr ipaddr;
  50                 struct subnet_record *subrec = NULL;
  51                 enum name_source source = LMHOSTS_NAME;
  52
  53                 if (ss.ss_family != AF_INET) {
  54                         TALLOC_FREE(name);
  55                         continue;
  56                 }
  57
  58                 ipaddr = ((struct sockaddr_in *)&ss)->sin_addr;
  59
  60                 /* We find a relevant subnet to put this entry on, then add it. */
  61                 /* Go through all the broadcast subnets and see if the mask matches. */
  62                 for (subrec = FIRST_SUBNET; subrec ; subrec = NEXT_SUBNET_EXCLUDING_UNICAST(subrec)) {
  63                         if(same_net_v4(ipaddr, subrec->bcast_ip, subrec->mask_ip))
  64                                 break;
  65                 }
  66
  67                 /* If none match add the name to the remote_broadcast_subnet. */
  68                 if(subrec == NULL)
  69                         subrec = remote_broadcast_subnet;
  70
  71                 if(name_type == -1) {
  72                         /* Add the (0) and (0x20) names directly into the namelist for this subnet. */
  73                         (void)add_name_to_subnet(subrec,name,0x00,(uint16_t)NB_ACTIVE,PERMANENT_TTL,source,1,&ipaddr);
  74                         (void)add_name_to_subnet(subrec,name,0x20,(uint16_t)NB_ACTIVE,PERMANENT_TTL,source,1,&ipaddr);
  75                 } else {
  76                         /* Add the given name type to the subnet namelist. */
  77                         (void)add_name_to_subnet(subrec,name,name_type,(uint16_t)NB_ACTIVE,PERMANENT_TTL,source,1,&ipaddr);
  78                 }
  79         }
  80
  81         TALLOC_FREE(ctx);
  82         endlmhosts(fp);
  83 }
  84
  85 /****************************************************************************
  86   Find a name read from the lmhosts file. We secretly check the names on
  87   the remote_broadcast_subnet as if the name was added to a regular broadcast
  88   subnet it will be found by normal name query processing.
  89 ****************************************************************************/
  90
  91 bool find_name_in_lmhosts(struct nmb_name *nmbname, struct name_record **namerecp)
  92 {
  93         struct name_record *namerec;
  94
  95         *namerecp = NULL;
  96
  97         if((namerec = find_name_on_subnet(remote_broadcast_subnet, nmbname, FIND_ANY_NAME))==NULL)
  98                 return False;
  99
 100         if(!NAME_IS_ACTIVE(namerec) || (namerec->data.source != LMHOSTS_NAME))
 101                 return False;
 102
 103         *namerecp = namerec;
 104         return True;
 105 }