source/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
  22 static struct db_context *connections_db_ctx(bool rw)
  23 {
  24         static struct db_context *db_ctx;
  25
  26         if (db_ctx != NULL) {
  27                 return db_ctx;
  28         }
  29
  30         if (rw) {
  31                 db_ctx = db_open(NULL, lock_path("connections.tdb"), 0,
  32                                  TDB_CLEAR_IF_FIRST|TDB_DEFAULT,
  33                                  O_RDWR | O_CREAT, 0644);
  34         }
  35         else {
  36                 db_ctx = db_open(NULL, lock_path("connections.tdb"), 0,
  37                                  TDB_CLEAR_IF_FIRST|TDB_DEFAULT, O_RDONLY, 0);
  38         }
  39
  40         return db_ctx;
  41 }
  42
  43 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 ctx->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 = procid_self();
  64         ckey.cnum = conn ? conn->cnum : -1;
  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         struct conn_traverse_state *state =
  84                 (struct conn_traverse_state *)private_data;
  85
  86         if ((rec->key.dsize != sizeof(struct connections_key))
  87             || (rec->value.dsize != sizeof(struct connections_data))) {
  88                 return 0;
  89         }
  90
  91         return state->fn(rec, (const struct connections_key *)rec->key.dptr,
  92                          (const struct connections_data *)rec->value.dptr,
  93                          state->private_data);
  94 }
  95
  96 int connections_traverse(int (*fn)(struct db_record *rec,
  97                                    void *private_data),
  98                          void *private_data)
  99 {
 100         struct db_context *ctx = connections_db_ctx(False);
 101
 102         if (ctx == NULL) {
 103                 return -1;
 104         }
 105
 106         return ctx->traverse(ctx, fn, private_data);
 107 }
 108
 109 int connections_forall(int (*fn)(struct db_record *rec,
 110                                  const struct connections_key *key,
 111                                  const struct connections_data *data,
 112                                  void *private_data),
 113                        void *private_data)
 114 {
 115         struct conn_traverse_state state;
 116
 117         state.fn = fn;
 118         state.private_data = private_data;
 119
 120         return connections_traverse(conn_traverse_fn, (void *)&state);
 121 }
 122
 123 bool connections_init(bool rw)
 124 {
 125         return (connections_db_ctx(rw) != NULL);
 126 }