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 "smbd/globals.h"
  22 #include "dbwrap.h"
  23
  24 static struct db_context *connections_db_ctx(bool rw)
  25 {
  26         static struct db_context *db_ctx;
  27         int open_flags;
  28
  29         if (db_ctx != NULL) {
  30                 return db_ctx;
  31         }
  32
  33         open_flags = rw ? (O_RDWR|O_CREAT) : O_RDONLY;
  34
  35         db_ctx = db_open(NULL, lock_path("connections.tdb"), 0,
  36                          TDB_CLEAR_IF_FIRST|TDB_INCOMPATIBLE_HASH|TDB_DEFAULT, open_flags, 0644);
  37         return db_ctx;
  38 }
  39
  40 static struct db_record *connections_fetch_record(TALLOC_CTX *mem_ctx,
  41                                                   TDB_DATA key)
  42 {
  43         struct db_context *ctx = connections_db_ctx(True);
  44
  45         if (ctx == NULL) {
  46                 return NULL;
  47         }
  48
  49         return ctx->fetch_locked(ctx, mem_ctx, key);
  50 }
  51
  52 struct db_record *connections_fetch_entry(TALLOC_CTX *mem_ctx,
  53                                           connection_struct *conn,
  54                                           const char *name)
  55 {
  56         struct connections_key ckey;
  57         TDB_DATA key;
  58
  59         ZERO_STRUCT(ckey);
  60         ckey.pid = sconn_server_id(conn->sconn);
  61         ckey.cnum = conn->cnum;
  62         strlcpy(ckey.name, name, sizeof(ckey.name));
  63
  64         key.dsize = sizeof(ckey);
  65         key.dptr = (uint8 *)&ckey;
  66
  67         return connections_fetch_record(mem_ctx, key);
  68 }
  69
  70 struct conn_traverse_state {
  71         int (*fn)(struct db_record *rec,
  72                   const struct connections_key *key,
  73                   const struct connections_data *data,
  74                   void *private_data);
  75         void *private_data;
  76 };
  77
  78 static int conn_traverse_fn(struct db_record *rec, void *private_data)
  79 {
  80         struct conn_traverse_state *state =
  81                 (struct conn_traverse_state *)private_data;
  82
  83         if ((rec->key.dsize != sizeof(struct connections_key))
  84             || (rec->value.dsize != sizeof(struct connections_data))) {
  85                 return 0;
  86         }
  87
  88         return state->fn(rec, (const struct connections_key *)rec->key.dptr,
  89                          (const struct connections_data *)rec->value.dptr,
  90                          state->private_data);
  91 }
  92
  93 int connections_traverse(int (*fn)(struct db_record *rec,
  94                                    void *private_data),
  95                          void *private_data)
  96 {
  97         struct db_context *ctx = connections_db_ctx(False);
  98
  99         if (ctx == NULL) {
 100                 return -1;
 101         }
 102
 103         return ctx->traverse(ctx, fn, private_data);
 104 }
 105
 106 int connections_forall(int (*fn)(struct db_record *rec,
 107                                  const struct connections_key *key,
 108                                  const struct connections_data *data,
 109                                  void *private_data),
 110                        void *private_data)
 111 {
 112         struct db_context *ctx;
 113         struct conn_traverse_state state;
 114
 115         ctx = connections_db_ctx(true);
 116         if (ctx == NULL) {
 117                 return -1;
 118         }
 119
 120         state.fn = fn;
 121         state.private_data = private_data;
 122
 123         return ctx->traverse(ctx, conn_traverse_fn, (void *)&state);
 124 }
 125
 126 struct conn_traverse_read_state {
 127         int (*fn)(const struct connections_key *key,
 128                   const struct connections_data *data,
 129                   void *private_data);
 130         void *private_data;
 131 };
 132
 133 static int connections_forall_read_fn(struct db_record *rec,
 134                                       void *private_data)
 135 {
 136         struct conn_traverse_read_state *state =
 137                 (struct conn_traverse_read_state *)private_data;
 138
 139         if ((rec->key.dsize != sizeof(struct connections_key))
 140             || (rec->value.dsize != sizeof(struct connections_data))) {
 141                 return 0;
 142         }
 143         return state->fn((const struct connections_key *)rec->key.dptr,
 144                          (const struct connections_data *)rec->value.dptr,
 145                          state->private_data);
 146 }
 147
 148 int connections_forall_read(int (*fn)(const struct connections_key *key,
 149                                       const struct connections_data *data,
 150                                       void *private_data),
 151                             void *private_data)
 152 {
 153         struct db_context *ctx;
 154         struct conn_traverse_read_state state;
 155
 156         ctx = connections_db_ctx(false);
 157         if (ctx == NULL) {
 158                 return -1;
 159         }
 160
 161         state.fn = fn;
 162         state.private_data = private_data;
 163
 164         return ctx->traverse_read(ctx, connections_forall_read_fn,
 165                                   (void *)&state);
 166 }
 167
 168 bool connections_init(bool rw)
 169 {
 170         return (connections_db_ctx(rw) != NULL);
 171 }