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