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, write to the Free Software
  18    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  19 */
  20
  21 #include "includes.h"
  22
  23 static struct db_context *connections_db_ctx(BOOL rw)
  24 {
  25         static struct db_context *db_ctx;
  26
  27         if (db_ctx != NULL) {
  28                 return db_ctx;
  29         }
  30
  31         if (rw) {
  32                 db_ctx = db_open(NULL, lock_path("connections.tdb"), 0,
  33                                  TDB_CLEAR_IF_FIRST|TDB_DEFAULT,
  34                                  O_RDWR | O_CREAT, 0644);
  35         }
  36         else {
  37                 db_ctx = db_open(NULL, lock_path("connections.tdb"), 0,
  38                                  TDB_DEFAULT, O_RDONLY, 0);
  39         }
  40
  41         return db_ctx;
  42 }
  43
  44 struct db_record *connections_fetch_record(TALLOC_CTX *mem_ctx,
  45                                            TDB_DATA key)
  46 {
  47         struct db_context *ctx = connections_db_ctx(True);
  48
  49         if (ctx == NULL) {
  50                 return NULL;
  51         }
  52
  53         return ctx->fetch_locked(ctx, mem_ctx, key);
  54 }
  55
  56 struct db_record *connections_fetch_entry(TALLOC_CTX *mem_ctx,
  57                                           connection_struct *conn,
  58                                           const char *name)
  59 {
  60         struct connections_key ckey;
  61         TDB_DATA key;
  62
  63         ZERO_STRUCT(ckey);
  64         ckey.pid = procid_self();
  65         ckey.cnum = conn ? conn->cnum : -1;
  66         strlcpy(ckey.name, name, sizeof(ckey.name));
  67
  68         key.dsize = sizeof(ckey);
  69         key.dptr = (uint8 *)&ckey;
  70
  71         return connections_fetch_record(mem_ctx, key);
  72 }
  73
  74 struct conn_traverse_state {
  75         int (*fn)(struct db_record *rec,
  76                   const struct connections_key *key,
  77                   const struct connections_data *data,
  78                   void *private_data);
  79         void *private_data;
  80 };
  81
  82 static int conn_traverse_fn(struct db_record *rec, void *private_data)
  83 {
  84         struct conn_traverse_state *state =
  85                 (struct conn_traverse_state *)private_data;
  86
  87         if ((rec->key.dsize != sizeof(struct connections_key))
  88             || (rec->value.dsize != sizeof(struct connections_data))) {
  89                 return 0;
  90         }
  91
  92         return state->fn(rec, (const struct connections_key *)rec->key.dptr,
  93                          (const struct connections_data *)rec->value.dptr,
  94                          state->private_data);
  95 }
  96
  97 int connections_traverse(int (*fn)(struct db_record *rec,
  98                                    void *private_data),
  99                          void *private_data)
 100 {
 101         struct db_context *ctx = connections_db_ctx(False);
 102
 103         if (ctx == NULL) {
 104                 return -1;
 105         }
 106
 107         return ctx->traverse(ctx, fn, private_data);
 108 }
 109
 110 int connections_forall(int (*fn)(struct db_record *rec,
 111                                  const struct connections_key *key,
 112                                  const struct connections_data *data,
 113                                  void *private_data),
 114                        void *private_data)
 115 {
 116         struct conn_traverse_state state;
 117
 118         state.fn = fn;
 119         state.private_data = private_data;
 120
 121         return connections_traverse(conn_traverse_fn, (void *)&state);
 122 }
 123
 124 BOOL connections_init(BOOL rw)
 125 {
 126         return (connections_db_ctx(rw) != NULL);
 127 }