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 struct conn_traverse_read_state {
  85         int (*fn)(const struct connections_key *key,
  86                   const struct connections_data *data,
  87                   void *private_data);
  88         void *private_data;
  89 };
  90
  91 static int connections_forall_read_fn(struct db_record *rec,
  92                                       void *private_data)
  93 {
  94         TDB_DATA key;
  95         TDB_DATA value;
  96         struct conn_traverse_read_state *state =
  97                 (struct conn_traverse_read_state *)private_data;
  98
  99         key = dbwrap_record_get_key(rec);
 100         value = dbwrap_record_get_value(rec);
 101
 102         if ((key.dsize != sizeof(struct connections_key))
 103             || (value.dsize != sizeof(struct connections_data))) {
 104                 return 0;
 105         }
 106         return state->fn((const struct connections_key *)key.dptr,
 107                          (const struct connections_data *)value.dptr,
 108                          state->private_data);
 109 }
 110
 111 int connections_forall_read(int (*fn)(const struct connections_key *key,
 112                                       const struct connections_data *data,
 113                                       void *private_data),
 114                             void *private_data)
 115 {
 116         struct db_context *ctx;
 117         struct conn_traverse_read_state state;
 118         NTSTATUS status;
 119         int count;
 120
 121         ctx = connections_db_ctx(false);
 122         if (ctx == NULL) {
 123                 return -1;
 124         }
 125
 126         state.fn = fn;
 127         state.private_data = private_data;
 128
 129         status = dbwrap_traverse_read(ctx, connections_forall_read_fn,
 130                                       (void *)&state, &count);
 131
 132         if (!NT_STATUS_IS_OK(status)) {
 133                 return -1;
 134         }
 135
 136         return count;
 137 }
 138
 139 bool connections_init(bool rw)
 140 {
 141         return (connections_db_ctx(rw) != NULL);
 142 }