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 db->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         struct sessionid_traverse_state *state =
  71                 (struct sessionid_traverse_state *)private_data;
  72         struct sessionid session;
  73
  74         if ((rec->key.dptr[rec->key.dsize-1] != '\0')
  75             || (rec->value.dsize != sizeof(struct sessionid))) {
  76                 DEBUG(1, ("Found invalid record in sessionid.tdb\n"));
  77                 return 0;
  78         }
  79
  80         memcpy(&session, rec->value.dptr, sizeof(session));
  81
  82         return state->fn(rec, (char *)rec->key.dptr, &session,
  83                          state->private_data);
  84 }
  85
  86 int sessionid_traverse(int (*fn)(struct db_record *rec, const char *key,
  87                                  struct sessionid *session,
  88                                  void *private_data),
  89                        void *private_data)
  90 {
  91         struct db_context *db;
  92         struct sessionid_traverse_state state;
  93
  94         db = session_db_ctx();
  95         if (db == NULL) {
  96                 return -1;
  97         }
  98         state.fn = fn;
  99         state.private_data = private_data;
 100         return db->traverse(db, sessionid_traverse_fn, &state);
 101 }
 102
 103 struct sessionid_traverse_read_state {
 104         int (*fn)(const char *key, struct sessionid *session,
 105                   void *private_data);
 106         void *private_data;
 107 };
 108
 109 static int sessionid_traverse_read_fn(struct db_record *rec,
 110                                       void *private_data)
 111 {
 112         struct sessionid_traverse_read_state *state =
 113                 (struct sessionid_traverse_read_state *)private_data;
 114         struct sessionid session;
 115
 116         if ((rec->key.dptr[rec->key.dsize-1] != '\0')
 117             || (rec->value.dsize != sizeof(struct sessionid))) {
 118                 DEBUG(1, ("Found invalid record in sessionid.tdb\n"));
 119                 return 0;
 120         }
 121
 122         memcpy(&session, rec->value.dptr, sizeof(session));
 123
 124         return state->fn((char *)rec->key.dptr, &session,
 125                          state->private_data);
 126 }
 127
 128 int sessionid_traverse_read(int (*fn)(const char *key,
 129                                       struct sessionid *session,
 130                                       void *private_data),
 131                             void *private_data)
 132 {
 133         struct db_context *db;
 134         struct sessionid_traverse_read_state state;
 135
 136         db = session_db_ctx();
 137         if (db == NULL) {
 138                 return -1;
 139         }
 140         state.fn = fn;
 141         state.private_data = private_data;
 142         return db->traverse(db, sessionid_traverse_read_fn, &state);
 143 }