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,
  40                          open_flags, 0644, DBWRAP_LOCK_ORDER_1);
  41         return db_ctx;
  42 }
  43
  44 static 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 dbwrap_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 = messaging_server_id(conn->sconn->msg_ctx);
  65         ckey.cnum = conn->cnum;
  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         TDB_DATA key;
  85         TDB_DATA value;
  86         struct conn_traverse_state *state =
  87                 (struct conn_traverse_state *)private_data;
  88
  89         key = dbwrap_record_get_key(rec);
  90         value = dbwrap_record_get_value(rec);
  91
  92         if ((key.dsize != sizeof(struct connections_key))
  93             || (value.dsize != sizeof(struct connections_data))) {
  94                 return 0;
  95         }
  96
  97         return state->fn(rec, (const struct connections_key *)key.dptr,
  98                          (const struct connections_data *)value.dptr,
  99                          state->private_data);
 100 }
 101
 102 int connections_traverse(int (*fn)(struct db_record *rec,
 103                                    void *private_data),
 104                          void *private_data)
 105 {
 106         NTSTATUS status;
 107         int count;
 108         struct db_context *ctx = connections_db_ctx(False);
 109
 110         if (ctx == NULL) {
 111                 return -1;
 112         }
 113
 114         status = dbwrap_traverse(ctx, fn, private_data, &count);
 115         if (!NT_STATUS_IS_OK(status)) {
 116                 return -1;
 117         }
 118
 119         return count;
 120 }
 121
 122 int connections_forall(int (*fn)(struct db_record *rec,
 123                                  const struct connections_key *key,
 124                                  const struct connections_data *data,
 125                                  void *private_data),
 126                        void *private_data)
 127 {
 128         struct db_context *ctx;
 129         struct conn_traverse_state state;
 130         NTSTATUS status;
 131         int count;
 132
 133         ctx = connections_db_ctx(true);
 134         if (ctx == NULL) {
 135                 return -1;
 136         }
 137
 138         state.fn = fn;
 139         state.private_data = private_data;
 140
 141         status = dbwrap_traverse(ctx, conn_traverse_fn, (void *)&state, &count);
 142         if (!NT_STATUS_IS_OK(status)) {
 143                 return -1;
 144         }
 145
 146         return count;
 147 }
 148
 149 struct conn_traverse_read_state {
 150         int (*fn)(const struct connections_key *key,
 151                   const struct connections_data *data,
 152                   void *private_data);
 153         void *private_data;
 154 };
 155
 156 static int connections_forall_read_fn(struct db_record *rec,
 157                                       void *private_data)
 158 {
 159         TDB_DATA key;
 160         TDB_DATA value;
 161         struct conn_traverse_read_state *state =
 162                 (struct conn_traverse_read_state *)private_data;
 163
 164         key = dbwrap_record_get_key(rec);
 165         value = dbwrap_record_get_value(rec);
 166
 167         if ((key.dsize != sizeof(struct connections_key))
 168             || (value.dsize != sizeof(struct connections_data))) {
 169                 return 0;
 170         }
 171         return state->fn((const struct connections_key *)key.dptr,
 172                          (const struct connections_data *)value.dptr,
 173                          state->private_data);
 174 }
 175
 176 int connections_forall_read(int (*fn)(const struct connections_key *key,
 177                                       const struct connections_data *data,
 178                                       void *private_data),
 179                             void *private_data)
 180 {
 181         struct db_context *ctx;
 182         struct conn_traverse_read_state state;
 183         NTSTATUS status;
 184         int count;
 185
 186         ctx = connections_db_ctx(false);
 187         if (ctx == NULL) {
 188                 return -1;
 189         }
 190
 191         state.fn = fn;
 192         state.private_data = private_data;
 193
 194         status = dbwrap_traverse_read(ctx, connections_forall_read_fn,
 195                                       (void *)&state, &count);
 196
 197         if (!NT_STATUS_IS_OK(status)) {
 198                 return -1;
 199         }
 200
 201         return count;
 202 }
 203
 204 bool connections_init(bool rw)
 205 {
 206         return (connections_db_ctx(rw) != NULL);
 207 }