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