source3/lib/conn_tdb.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3    Low-level connections.tdb access functions
   4    Copyright (C) Volker Lendecke 2007
   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 #include "includes.h"
  21 #include "system/filesys.h"
  22 #include "smbd/globals.h"
  23 #include "dbwrap/dbwrap.h"
  24 #include "dbwrap/dbwrap_open.h"
  25 #include "messages.h"
  26 #include "lib/conn_tdb.h"
  27
  28 static struct db_context *connections_db_ctx(bool rw)
  29 {
  30         static struct db_context *db_ctx;
  31         int open_flags;
  32
  33         if (db_ctx != NULL) {
  34                 return db_ctx;
  35         }
  36
  37         open_flags = rw ? (O_RDWR|O_CREAT) : O_RDONLY;
  38
  39         db_ctx = db_open(NULL, lock_path("connections.tdb"), 0,
  40                          TDB_CLEAR_IF_FIRST|TDB_INCOMPATIBLE_HASH|TDB_DEFAULT,
  41                          open_flags, 0644, DBWRAP_LOCK_ORDER_1);
  42         return db_ctx;
  43 }
  44
  45 static struct db_record *connections_fetch_record(TALLOC_CTX *mem_ctx,
  46                                                   TDB_DATA key)
  47 {
  48         struct db_context *ctx = connections_db_ctx(True);
  49
  50         if (ctx == NULL) {
  51                 return NULL;
  52         }
  53
  54         return dbwrap_fetch_locked(ctx, mem_ctx, key);
  55 }
  56
  57 struct db_record *connections_fetch_entry(TALLOC_CTX *mem_ctx,
  58                                           connection_struct *conn,
  59                                           const char *name)
  60 {
  61         struct connections_key ckey;
  62         TDB_DATA key;
  63
  64         ZERO_STRUCT(ckey);
  65         ckey.pid = messaging_server_id(conn->sconn->msg_ctx);
  66         ckey.cnum = conn->cnum;
  67         strlcpy(ckey.name, name, sizeof(ckey.name));
  68
  69         key.dsize = sizeof(ckey);
  70         key.dptr = (uint8 *)&ckey;
  71
  72         return connections_fetch_record(mem_ctx, key);
  73 }
  74
  75 struct conn_traverse_state {
  76         int (*fn)(struct db_record *rec,
  77                   const struct connections_key *key,
  78                   const struct connections_data *data,
  79                   void *private_data);
  80         void *private_data;
  81 };
  82
  83 static int conn_traverse_fn(struct db_record *rec, void *private_data)
  84 {
  85         TDB_DATA key;
  86         TDB_DATA value;
  87         struct conn_traverse_state *state =
  88                 (struct conn_traverse_state *)private_data;
  89
  90         key = dbwrap_record_get_key(rec);
  91         value = dbwrap_record_get_value(rec);
  92
  93         if ((key.dsize != sizeof(struct connections_key))
  94             || (value.dsize != sizeof(struct connections_data))) {
  95                 return 0;
  96         }
  97
  98         return state->fn(rec, (const struct connections_key *)key.dptr,
  99                          (const struct connections_data *)value.dptr,
 100                          state->private_data);
 101 }
 102
 103 int connections_traverse(int (*fn)(struct db_record *rec,
 104                                    void *private_data),
 105                          void *private_data)
 106 {
 107         NTSTATUS status;
 108         int count;
 109         struct db_context *ctx = connections_db_ctx(False);
 110
 111         if (ctx == NULL) {
 112                 return -1;
 113         }
 114
 115         status = dbwrap_traverse(ctx, fn, private_data, &count);
 116         if (!NT_STATUS_IS_OK(status)) {
 117                 return -1;
 118         }
 119
 120         return count;
 121 }
 122
 123 int connections_forall(int (*fn)(struct db_record *rec,
 124                                  const struct connections_key *key,
 125                                  const struct connections_data *data,
 126                                  void *private_data),
 127                        void *private_data)
 128 {
 129         struct db_context *ctx;
 130         struct conn_traverse_state state;
 131         NTSTATUS status;
 132         int count;
 133
 134         ctx = connections_db_ctx(true);
 135         if (ctx == NULL) {
 136                 return -1;
 137         }
 138
 139         state.fn = fn;
 140         state.private_data = private_data;
 141
 142         status = dbwrap_traverse(ctx, conn_traverse_fn, (void *)&state, &count);
 143         if (!NT_STATUS_IS_OK(status)) {
 144                 return -1;
 145         }
 146
 147         return count;
 148 }
 149
 150 struct conn_traverse_read_state {
 151         int (*fn)(const struct connections_key *key,
 152                   const struct connections_data *data,
 153                   void *private_data);
 154         void *private_data;
 155 };
 156
 157 static int connections_forall_read_fn(struct db_record *rec,
 158                                       void *private_data)
 159 {
 160         TDB_DATA key;
 161         TDB_DATA value;
 162         struct conn_traverse_read_state *state =
 163                 (struct conn_traverse_read_state *)private_data;
 164
 165         key = dbwrap_record_get_key(rec);
 166         value = dbwrap_record_get_value(rec);
 167
 168         if ((key.dsize != sizeof(struct connections_key))
 169             || (value.dsize != sizeof(struct connections_data))) {
 170                 return 0;
 171         }
 172         return state->fn((const struct connections_key *)key.dptr,
 173                          (const struct connections_data *)value.dptr,
 174                          state->private_data);
 175 }
 176
 177 int connections_forall_read(int (*fn)(const struct connections_key *key,
 178                                       const struct connections_data *data,
 179                                       void *private_data),
 180                             void *private_data)
 181 {
 182         struct db_context *ctx;
 183         struct conn_traverse_read_state state;
 184         NTSTATUS status;
 185         int count;
 186
 187         ctx = connections_db_ctx(false);
 188         if (ctx == NULL) {
 189                 return -1;
 190         }
 191
 192         state.fn = fn;
 193         state.private_data = private_data;
 194
 195         status = dbwrap_traverse_read(ctx, connections_forall_read_fn,
 196                                       (void *)&state, &count);
 197
 198         if (!NT_STATUS_IS_OK(status)) {
 199                 return -1;
 200         }
 201
 202         return count;
 203 }
 204
 205 bool connections_init(bool rw)
 206 {
 207         return (connections_db_ctx(rw) != NULL);
 208 }