source3/lib/sessionid_tdb.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3    Low-level sessionid.tdb access functions
   4    Copyright (C) Volker Lendecke 2010
   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 "dbwrap/dbwrap.h"
  23 #include "dbwrap/dbwrap_open.h"
  24 #include "session.h"
  25 #include "util_tdb.h"
  26
  27 static struct db_context *session_db_ctx(void)
  28 {
  29         static struct db_context *session_db_ctx_ptr;
  30
  31         if (session_db_ctx_ptr != NULL) {
  32                 return session_db_ctx_ptr;
  33         }
  34
  35         session_db_ctx_ptr = db_open(NULL, lock_path("sessionid.tdb"), 0,
  36                                      TDB_CLEAR_IF_FIRST|TDB_DEFAULT|TDB_INCOMPATIBLE_HASH,
  37                                      O_RDWR | O_CREAT, 0644);
  38         return session_db_ctx_ptr;
  39 }
  40
  41 bool sessionid_init(void)
  42 {
  43         if (session_db_ctx() == NULL) {
  44                 DEBUG(1,("session_init: failed to open sessionid tdb\n"));
  45                 return False;
  46         }
  47
  48         return True;
  49 }
  50
  51 struct db_record *sessionid_fetch_record(TALLOC_CTX *mem_ctx, const char *key)
  52 {
  53         struct db_context *db;
  54
  55         db = session_db_ctx();
  56         if (db == NULL) {
  57                 return NULL;
  58         }
  59         return dbwrap_fetch_locked(db, mem_ctx, string_term_tdb_data(key));
  60 }
  61
  62 struct sessionid_traverse_state {
  63         int (*fn)(struct db_record *rec, const char *key,
  64                   struct sessionid *session, void *private_data);
  65         void *private_data;
  66 };
  67
  68 static int sessionid_traverse_fn(struct db_record *rec, void *private_data)
  69 {
  70         TDB_DATA key;
  71         TDB_DATA value;
  72         struct sessionid_traverse_state *state =
  73                 (struct sessionid_traverse_state *)private_data;
  74         struct sessionid session;
  75
  76         key = dbwrap_record_get_key(rec);
  77         value = dbwrap_record_get_value(rec);
  78         if ((key.dptr[key.dsize-1] != '\0')
  79             || (value.dsize != sizeof(struct sessionid))) {
  80                 DEBUG(1, ("Found invalid record in sessionid.tdb\n"));
  81                 return 0;
  82         }
  83
  84         memcpy(&session, value.dptr, sizeof(session));
  85
  86         return state->fn(rec, (char *)key.dptr, &session,
  87                          state->private_data);
  88 }
  89
  90 NTSTATUS sessionid_traverse(int (*fn)(struct db_record *rec, const char *key,
  91                                       struct sessionid *session,
  92                                       void *private_data),
  93                             void *private_data)
  94 {
  95         struct db_context *db;
  96         struct sessionid_traverse_state state;
  97         NTSTATUS status;
  98
  99         db = session_db_ctx();
 100         if (db == NULL) {
 101                 return NT_STATUS_UNSUCCESSFUL;
 102         }
 103         state.fn = fn;
 104         state.private_data = private_data;
 105         status = dbwrap_traverse(db, sessionid_traverse_fn, &state, NULL);
 106         return status;
 107 }
 108
 109 struct sessionid_traverse_read_state {
 110         int (*fn)(const char *key, struct sessionid *session,
 111                   void *private_data);
 112         void *private_data;
 113 };
 114
 115 static int sessionid_traverse_read_fn(struct db_record *rec,
 116                                       void *private_data)
 117 {
 118         TDB_DATA key;
 119         TDB_DATA value;
 120         struct sessionid_traverse_read_state *state =
 121                 (struct sessionid_traverse_read_state *)private_data;
 122         struct sessionid session;
 123
 124         key = dbwrap_record_get_key(rec);
 125         value = dbwrap_record_get_value(rec);
 126
 127         if ((key.dptr[key.dsize-1] != '\0')
 128             || (value.dsize != sizeof(struct sessionid))) {
 129                 DEBUG(1, ("Found invalid record in sessionid.tdb\n"));
 130                 return 0;
 131         }
 132
 133         memcpy(&session, value.dptr, sizeof(session));
 134
 135         return state->fn((char *)key.dptr, &session,
 136                          state->private_data);
 137 }
 138
 139 NTSTATUS sessionid_traverse_read(int (*fn)(const char *key,
 140                                           struct sessionid *session,
 141                                           void *private_data),
 142                                  void *private_data)
 143 {
 144         struct db_context *db;
 145         struct sessionid_traverse_read_state state;
 146         NTSTATUS status;
 147
 148         db = session_db_ctx();
 149         if (db == NULL) {
 150                 return NT_STATUS_UNSUCCESSFUL;
 151         }
 152         state.fn = fn;
 153         state.private_data = private_data;
 154         status = dbwrap_traverse_read(db, sessionid_traverse_read_fn, &state,
 155                                       NULL);
 156         return status;
 157 }