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