lib/dbwrap/dbwrap_local_open.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3    Database interface wrapper: local open code.
   4
   5    Copyright (C) Rusty Russell 2012
   6
   7    This program is free software; you can redistribute it and/or modify
   8    it under the terms of the GNU General Public License as published by
   9    the Free Software Foundation; either version 3 of the License, or
  10    (at your option) any later version.
  11
  12    This program is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15    GNU General Public License for more details.
  16
  17    You should have received a copy of the GNU General Public License
  18    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  19 */
  20
  21 #include "includes.h"
  22 #include "dbwrap/dbwrap.h"
  23 #include "dbwrap/dbwrap_tdb.h"
  24 #include "dbwrap/dbwrap_ntdb.h"
  25 #include "tdb.h"
  26 #ifndef DISABLE_NTDB
  27 #include "lib/util/util_ntdb.h"
  28 #endif
  29 #include "lib/param/param.h"
  30 #include "system/filesys.h"
  31 #include "ccan/str/str.h"
  32
  33 #ifndef DISABLE_NTDB
  34 struct flag_map {
  35         int tdb_flag;
  36         int ntdb_flag;
  37 };
  38
  39 static const struct flag_map tdb_ntdb_flags[] = {
  40         { TDB_CLEAR_IF_FIRST, NTDB_CLEAR_IF_FIRST },
  41         { TDB_INTERNAL, NTDB_INTERNAL },
  42         { TDB_NOLOCK, NTDB_NOLOCK },
  43         { TDB_NOMMAP, NTDB_NOMMAP },
  44         { TDB_CONVERT, NTDB_CONVERT },
  45         { TDB_NOSYNC, NTDB_NOSYNC },
  46         { TDB_SEQNUM, NTDB_SEQNUM },
  47         { TDB_VOLATILE, 0 },
  48         { TDB_ALLOW_NESTING, NTDB_ALLOW_NESTING },
  49         { TDB_DISALLOW_NESTING, 0 },
  50         { TDB_INCOMPATIBLE_HASH, 0 }
  51 };
  52
  53 static int tdb_flags_to_ntdb_flags(int tdb_flags)
  54 {
  55         unsigned int i;
  56         int ntdb_flags = 0;
  57
  58         /* TDB allows nesting unless told not to. */
  59         if (!(tdb_flags & TDB_DISALLOW_NESTING))
  60                 ntdb_flags |= NTDB_ALLOW_NESTING;
  61
  62         for (i = 0; i < sizeof(tdb_ntdb_flags)/sizeof(tdb_ntdb_flags[0]); i++) {
  63                 if (tdb_flags & tdb_ntdb_flags[i].tdb_flag) {
  64                         tdb_flags &= ~tdb_ntdb_flags[i].tdb_flag;
  65                         ntdb_flags |= tdb_ntdb_flags[i].ntdb_flag;
  66                 }
  67         }
  68
  69         SMB_ASSERT(tdb_flags == 0);
  70         return ntdb_flags;
  71 }
  72
  73 struct trav_data {
  74         struct db_context *ntdb;
  75         NTSTATUS status;
  76 };
  77
  78 static int write_to_ntdb(struct db_record *rec, void *_tdata)
  79 {
  80         struct trav_data *tdata = _tdata;
  81         TDB_DATA key, value;
  82
  83         key = dbwrap_record_get_key(rec);
  84         value = dbwrap_record_get_value(rec);
  85
  86         tdata->status = dbwrap_store(tdata->ntdb, key, value, TDB_INSERT);
  87         if (!NT_STATUS_IS_OK(tdata->status)) {
  88                 return 1;
  89         }
  90         return 0;
  91 }
  92
  93 static bool tdb_to_ntdb(TALLOC_CTX *ctx, struct loadparm_context *lp_ctx,
  94                         const char *tdbname, const char *ntdbname)
  95 {
  96         struct db_context *ntdb, *tdb;
  97         char *bakname;
  98         const char *tdbbase, *bakbase;
  99         struct trav_data tdata;
 100         struct stat st;
 101
 102         /* We need permissions from the tdb file. */
 103         if (stat(tdbname, &st) == -1) {
 104                 DEBUG(0, ("tdb_to_ntdb: fstat %s failed: %s\n",
 105                           tdbname, strerror(errno)));
 106                 return false;
 107         }
 108         tdb = db_open_tdb(ctx, lp_ctx, tdbname, 0,
 109                           TDB_DEFAULT, O_RDONLY, 0, 0);
 110         if (!tdb) {
 111                 DEBUG(0, ("tdb_to_ntdb: could not open %s: %s\n",
 112                           tdbname, strerror(errno)));
 113                 return false;
 114         }
 115         ntdb = db_open_ntdb(ctx, lp_ctx, ntdbname, dbwrap_hash_size(tdb),
 116                             TDB_DEFAULT, O_RDWR|O_CREAT|O_EXCL,
 117                             st.st_mode & 0777, 0);
 118         if (!ntdb) {
 119                 DEBUG(0, ("tdb_to_ntdb: could not create %s: %s\n",
 120                           ntdbname, strerror(errno)));
 121                 return false;
 122         }
 123         bakname = talloc_asprintf(ctx, "%s.bak", tdbname);
 124         if (!bakname) {
 125                 DEBUG(0, ("tdb_to_ntdb: could not allocate\n"));
 126                 return false;
 127         }
 128
 129         tdata.status = NT_STATUS_OK;
 130         tdata.ntdb = ntdb;
 131         if (!NT_STATUS_IS_OK(dbwrap_traverse_read(tdb, write_to_ntdb, &tdata,
 132                                                   NULL))) {
 133                 return false;
 134         }
 135         if (!NT_STATUS_IS_OK(tdata.status)) {
 136                 return false;
 137         }
 138
 139         if (rename(tdbname, bakname) != 0) {
 140                 DEBUG(0, ("tdb_to_ntdb: could not rename %s to %s\n",
 141                           tdbname, bakname));
 142                 unlink(ntdbname);
 143                 return false;
 144         }
 145
 146         /* Make sure it's never accidentally used. */
 147         symlink("This is now in an NTDB", tdbname);
 148
 149         /* Make message a bit shorter by using basenames. */
 150         tdbbase = strrchr(tdbname, '/');
 151         if (!tdbbase)
 152                 tdbbase = tdbname;
 153         bakbase = strrchr(bakname, '/');
 154         if (!bakbase)
 155                 bakbase = bakname;
 156         DEBUG(1, ("Upgraded %s from %s (which moved to %s)\n",
 157                   ntdbname, tdbbase, bakbase));
 158         return true;
 159 }
 160 #endif /* !DISABLE_NTDB */
 161
 162 struct db_context *dbwrap_local_open(TALLOC_CTX *mem_ctx,
 163                                      struct loadparm_context *lp_ctx,
 164                                      const char *name,
 165                                      int hash_size, int tdb_flags,
 166                                      int open_flags, mode_t mode,
 167                                      enum dbwrap_lock_order lock_order)
 168 {
 169         TALLOC_CTX *tmp_ctx = talloc_new(mem_ctx);
 170         const char *ntdbname, *tdbname;
 171         struct db_context *db = NULL;
 172
 173         /* Get both .ntdb and .tdb variants of the name. */
 174         if (!name) {
 175                 tdbname = ntdbname = "unnamed database";
 176         } else if (strends(name, ".tdb")) {
 177                 tdbname = name;
 178                 ntdbname = talloc_asprintf(tmp_ctx,
 179                                            "%.*s.ntdb",
 180                                            (int)strlen(name) - 4, name);
 181         } else if (strends(name, ".ntdb")) {
 182                 ntdbname = name;
 183                 tdbname = talloc_asprintf(tmp_ctx,
 184                                           "%.*s.tdb",
 185                                           (int)strlen(name) - 5, name);
 186         } else {
 187                 DEBUG(1, ("WARNING: database '%s' does not end in .[n]tdb:"
 188                           " treating it as a TDB file!\n", name));
 189                 ntdbname = talloc_strdup(tmp_ctx, name);
 190                 tdbname = name;
 191         }
 192
 193         if (ntdbname == NULL || tdbname == NULL) {
 194                 DEBUG(0, ("talloc failed\n"));
 195                 goto out;
 196         }
 197
 198         if (name == ntdbname) {
 199 #ifdef DISABLE_NTDB
 200                 DEBUG(1, ("WARNING: no ntdb support to open '%s'\n", name));
 201 #else
 202                 int ntdb_flags = tdb_flags_to_ntdb_flags(tdb_flags);
 203
 204                 /* For non-internal databases, we upgrade on demand. */
 205                 if (!(tdb_flags & TDB_INTERNAL)) {
 206                         if (!file_exist(ntdbname) && file_exist(tdbname)) {
 207                                 if (!tdb_to_ntdb(tmp_ctx, lp_ctx,
 208                                                  tdbname, ntdbname)) {
 209                                         goto out;
 210                                 }
 211                         }
 212                 }
 213                 db = db_open_ntdb(mem_ctx, lp_ctx, ntdbname, hash_size,
 214                                   ntdb_flags, open_flags, mode, lock_order);
 215 #endif
 216         } else {
 217                 if (!streq(ntdbname, tdbname) && file_exist(ntdbname)) {
 218                         DEBUG(0, ("Refusing to open '%s' when '%s' exists\n",
 219                                   tdbname, ntdbname));
 220                         goto out;
 221                 }
 222                 db = db_open_tdb(mem_ctx, lp_ctx, tdbname, hash_size,
 223                                  tdb_flags, open_flags, mode,
 224                                  lock_order);
 225         }
 226 out:
 227         talloc_free(tmp_ctx);
 228         return db;
 229 }