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 #include "lib/conn_tdb.h"
  27
  28 static struct db_context *connections_db_ctx(bool rw)
  29 {
  30         static struct db_context *db_ctx;
  31         int open_flags;
  32
  33         if (db_ctx != NULL) {
  34                 return db_ctx;
  35         }
  36
  37         open_flags = rw ? (O_RDWR|O_CREAT) : O_RDONLY;
  38
  39         db_ctx = db_open(NULL, lock_path("connections.tdb"), 0,
  40                          TDB_CLEAR_IF_FIRST|TDB_INCOMPATIBLE_HASH|TDB_DEFAULT,
  41                          open_flags, 0644, DBWRAP_LOCK_ORDER_1);
  42         return db_ctx;
  43 }
  44
  45 static struct db_record *connections_fetch_record(TALLOC_CTX *mem_ctx,
  46                                                   TDB_DATA key)
  47 {
  48         struct db_context *ctx = connections_db_ctx(True);
  49
  50         if (ctx == NULL) {
  51                 return NULL;
  52         }
  53
  54         return dbwrap_fetch_locked(ctx, mem_ctx, key);
  55 }
  56
  57 struct db_record *connections_fetch_entry_ext(TALLOC_CTX *mem_ctx,
  58                                               struct server_id id,
  59                                               int cnum,
  60                                               const char *name)
  61 {
  62         struct connections_key ckey;
  63         TDB_DATA key;
  64
  65         ZERO_STRUCT(ckey);
  66         ckey.pid = id;
  67         ckey.cnum = cnum;
  68         strlcpy(ckey.name, name, sizeof(ckey.name));
  69
  70         key.dsize = sizeof(ckey);
  71         key.dptr = (uint8 *)&ckey;
  72
  73         return connections_fetch_record(mem_ctx, key);
  74 }
  75
  76 struct db_record *connections_fetch_entry(TALLOC_CTX *mem_ctx,
  77                                           connection_struct *conn,
  78                                           const char *name)
  79 {
  80         struct server_id id = messaging_server_id(conn->sconn->msg_ctx);
  81         return connections_fetch_entry_ext(mem_ctx, id, conn->cnum, name);
  82 }
  83
  84
  85 struct conn_traverse_state {
  86         int (*fn)(struct db_record *rec,
  87                   const struct connections_key *key,
  88                   const struct connections_data *data,
  89                   void *private_data);
  90         void *private_data;
  91 };
  92
  93 static int conn_traverse_fn(struct db_record *rec, void *private_data)
  94 {
  95         TDB_DATA key;
  96         TDB_DATA value;
  97         struct conn_traverse_state *state =
  98                 (struct conn_traverse_state *)private_data;
  99
 100         key = dbwrap_record_get_key(rec);
 101         value = dbwrap_record_get_value(rec);
 102
 103         if ((key.dsize != sizeof(struct connections_key))
 104             || (value.dsize != sizeof(struct connections_data))) {
 105                 return 0;
 106         }
 107
 108         return state->fn(rec, (const struct connections_key *)key.dptr,
 109                          (const struct connections_data *)value.dptr,
 110                          state->private_data);
 111 }
 112
 113 int connections_forall(int (*fn)(struct db_record *rec,
 114                                  const struct connections_key *key,
 115                                  const struct connections_data *data,
 116                                  void *private_data),
 117                        void *private_data)
 118 {
 119         struct db_context *ctx;
 120         struct conn_traverse_state state;
 121         NTSTATUS status;
 122         int count;
 123
 124         ctx = connections_db_ctx(true);
 125         if (ctx == NULL) {
 126                 return -1;
 127         }
 128
 129         state.fn = fn;
 130         state.private_data = private_data;
 131
 132         status = dbwrap_traverse(ctx, conn_traverse_fn, (void *)&state, &count);
 133         if (!NT_STATUS_IS_OK(status)) {
 134                 return -1;
 135         }
 136
 137         return count;
 138 }
 139
 140 struct conn_traverse_read_state {
 141         int (*fn)(const struct connections_key *key,
 142                   const struct connections_data *data,
 143                   void *private_data);
 144         void *private_data;
 145 };
 146
 147 static int connections_forall_read_fn(struct db_record *rec,
 148                                       void *private_data)
 149 {
 150         TDB_DATA key;
 151         TDB_DATA value;
 152         struct conn_traverse_read_state *state =
 153                 (struct conn_traverse_read_state *)private_data;
 154
 155         key = dbwrap_record_get_key(rec);
 156         value = dbwrap_record_get_value(rec);
 157
 158         if ((key.dsize != sizeof(struct connections_key))
 159             || (value.dsize != sizeof(struct connections_data))) {
 160                 return 0;
 161         }
 162         return state->fn((const struct connections_key *)key.dptr,
 163                          (const struct connections_data *)value.dptr,
 164                          state->private_data);
 165 }
 166
 167 int connections_forall_read(int (*fn)(const struct connections_key *key,
 168                                       const struct connections_data *data,
 169                                       void *private_data),
 170                             void *private_data)
 171 {
 172         struct db_context *ctx;
 173         struct conn_traverse_read_state state;
 174         NTSTATUS status;
 175         int count;
 176
 177         ctx = connections_db_ctx(false);
 178         if (ctx == NULL) {
 179                 return -1;
 180         }
 181
 182         state.fn = fn;
 183         state.private_data = private_data;
 184
 185         status = dbwrap_traverse_read(ctx, connections_forall_read_fn,
 186                                       (void *)&state, &count);
 187
 188         if (!NT_STATUS_IS_OK(status)) {
 189                 return -1;
 190         }
 191
 192         return count;
 193 }
 194
 195 bool connections_init(bool rw)
 196 {
 197         return (connections_db_ctx(rw) != NULL);
 198 }