source4/nbt_server/wins/wins_ldb.c

   1 /*
   2    ldb database module
   3
   4    Copyright (C) Stefan Metzmacher 2006
   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
  20 /*
  21  *  Name: ldb
  22  *
  23  *  Component: ldb winsdb module
  24  *
  25  *  Description: verify winsdb records before they're written to disk
  26  *
  27  *  Author: Stefan Metzmacher
  28  */
  29
  30 #include "includes.h"
  31 #include "lib/events/events.h"
  32 #include "nbt_server/nbt_server.h"
  33 #include "nbt_server/wins/winsdb.h"
  34 #include <ldb_module.h>
  35 #include "system/network.h"
  36 #include "lib/socket/netif.h"
  37 #include "param/param.h"
  38
  39 static int wins_ldb_verify(struct ldb_module *module, struct ldb_request *req)
  40 {
  41         struct ldb_context *ldb = ldb_module_get_ctx(module);
  42         struct winsdb_handle *h = talloc_get_type(ldb_get_opaque(ldb, "winsdb_handle"),
  43                                                   struct winsdb_handle);
  44         const struct ldb_message *msg;
  45
  46         switch (req->operation) {
  47         case LDB_ADD:
  48                 msg = req->op.add.message;
  49                 break;
  50
  51         case LDB_MODIFY:
  52                 msg = req->op.mod.message;
  53                 break;
  54
  55         default:
  56                 return ldb_next_request(module, req);
  57         }
  58
  59         /* do not manipulate our control entries */
  60         if (ldb_dn_is_special(msg->dn)) {
  61                 return ldb_next_request(module, req);
  62         }
  63
  64         if (!h) {
  65                 ldb_debug_set(ldb, LDB_DEBUG_FATAL, "%s", "WINS_LDB: INTERNAL ERROR: no winsdb_handle present!");
  66                 return LDB_ERR_OTHER;
  67         }
  68
  69         switch (h->caller) {
  70         case WINSDB_HANDLE_CALLER_NBTD:
  71         case WINSDB_HANDLE_CALLER_WREPL:
  72                 /* we trust our nbt and wrepl code ... */
  73                 return ldb_next_request(module, req);
  74
  75         case WINSDB_HANDLE_CALLER_ADMIN:
  76                 ldb_debug(ldb, LDB_DEBUG_WARNING, "%s\n", "WINS_LDB: TODO verify add/modify for WINSDB_HANDLE_CALLER_ADMIN");
  77                 return ldb_next_request(module, req);
  78         }
  79
  80         return LDB_ERR_OTHER;
  81 }
  82
  83 static int wins_ldb_init(struct ldb_module *module)
  84 {
  85         struct ldb_context *ldb = ldb_module_get_ctx(module);
  86         struct winsdb_handle *h;
  87         const char *owner;
  88         struct loadparm_context *lp_ctx = ldb_get_opaque(ldb, "loadparm");
  89
  90         ldb_module_set_private(module, NULL);
  91
  92         owner = lpcfg_parm_string(lp_ctx, NULL, "winsdb", "local_owner");
  93         if (!owner) {
  94                 struct interface *ifaces;
  95                 load_interface_list(module, lp_ctx, &ifaces);
  96                 owner = iface_list_first_v4(ifaces);
  97                 if (!owner) {
  98                         owner = "0.0.0.0";
  99                 }
 100         }
 101
 102         h = talloc_zero(module, struct winsdb_handle);
 103         if (!h) goto failed;
 104         h->ldb          = ldb;
 105         h->caller       = WINSDB_HANDLE_CALLER_ADMIN;
 106         h->local_owner  = talloc_strdup(h, owner);
 107         if (!h->local_owner) goto failed;
 108
 109         return ldb_set_opaque(ldb, "winsdb_handle", h);
 110
 111 failed:
 112         talloc_free(h);
 113         return LDB_ERR_OTHER;
 114 }
 115
 116 static const struct ldb_module_ops ldb_wins_ldb_module_ops = {
 117         .name          = "wins_ldb",
 118         .add           = wins_ldb_verify,
 119         .modify        = wins_ldb_verify,
 120         .init_context  = wins_ldb_init
 121 };
 122
 123 int ldb_wins_ldb_module_init(const char *version)
 124 {
 125         LDB_MODULE_CHECK_VERSION(version);
 126         return ldb_register_module(&ldb_wins_ldb_module_ops);
 127 }