src/src/dbstuff.h

   1 /*************************************************
   2 *     Exim - an Internet mail transport agent    *
   3 *************************************************/
   4
   5 /* Copyright (c) University of Cambridge 1995 - 2018 */
   6 /* Copyright (c) The Exim Maintainers 2020 */
   7 /* See the file NOTICE for conditions of use and distribution. */
   8
   9 /* This header file contains macro definitions so that a variety of DBM
  10 libraries can be used by Exim. Nigel Metheringham provided the original set for
  11 Berkeley DB 1.x in native mode and ndbm. Subsequently, versions for Berkeley DB
  12 2.x and 3.x were added. Later still, support for tdb was added, courtesy of
  13 James Antill. Most recently, support for native mode gdbm was added, with code
  14 from Pierre A. Humblet, so Exim could be made to work with Cygwin.
  15
  16 For convenience, the definitions of the structures used in the various hints
  17 databases are also kept in this file, which is used by the maintenance
  18 utilities as well as the main Exim binary. */
  19
  20
  21 # ifdef USE_TDB
  22
  23 /* ************************* tdb interface ************************ */
  24
  25 #include <tdb.h>
  26
  27 /* Basic DB type */
  28 #define EXIM_DB TDB_CONTEXT
  29
  30 /* Cursor type: tdb uses the previous "key" in _nextkey() (really it wants
  31 tdb_traverse to be called) */
  32 #define EXIM_CURSOR TDB_DATA
  33
  34 /* The datum type used for queries */
  35 #define EXIM_DATUM TDB_DATA
  36
  37 /* Some text for messages */
  38 #define EXIM_DBTYPE "tdb"
  39
  40 /* Access functions */
  41
  42 /* EXIM_DBOPEN - sets *dbpp to point to an EXIM_DB, NULL if failed */
  43 #define EXIM_DBOPEN__(name, dirname, flags, mode, dbpp) \
  44        *(dbpp) = tdb_open(CS name, 0, TDB_DEFAULT, flags, mode)
  45
  46 /* EXIM_DBGET - returns TRUE if successful, FALSE otherwise */
  47 #define EXIM_DBGET(db, key, data)      \
  48        (data = tdb_fetch(db, key), data.dptr != NULL)
  49
  50 /* EXIM_DBPUT - returns nothing useful, assumes replace mode */
  51 #define EXIM_DBPUT(db, key, data)      \
  52        tdb_store(db, key, data, TDB_REPLACE)
  53
  54 /* EXIM_DBPUTB - non-overwriting for use by dbmbuild */
  55 #define EXIM_DBPUTB(db, key, data)      \
  56        tdb_store(db, key, data, TDB_INSERT)
  57
  58 /* Returns from EXIM_DBPUTB */
  59
  60 #define EXIM_DBPUTB_OK  0
  61 #define EXIM_DBPUTB_DUP (-1)
  62
  63 /* EXIM_DBDEL */
  64 #define EXIM_DBDEL(db, key) tdb_delete(db, key)
  65
  66 /* EXIM_DBCREATE_CURSOR - initialize for scanning operation */
  67 #define EXIM_DBCREATE_CURSOR(db, cursor) { \
  68    *(cursor) = store_malloc(sizeof(TDB_DATA)); (*(cursor))->dptr = NULL; }
  69
  70 /* EXIM_DBSCAN - This is complicated because we have to free the last datum
  71 free() must not die when passed NULL */
  72 #define EXIM_DBSCAN(db, key, data, first, cursor)      \
  73        (key = (first ? tdb_firstkey(db) : tdb_nextkey(db, *(cursor))), \
  74         free((cursor)->dptr), *(cursor) = key, \
  75         key.dptr != NULL)
  76
  77 /* EXIM_DBDELETE_CURSOR - terminate scanning operation. */
  78 #define EXIM_DBDELETE_CURSOR(cursor) free(cursor)
  79
  80 /* EXIM_DBCLOSE */
  81 #define EXIM_DBCLOSE__(db)        tdb_close(db)
  82
  83 /* Datum access types - these are intended to be assignable */
  84
  85 #define EXIM_DATUM_SIZE(datum)  (datum).dsize
  86 #define EXIM_DATUM_DATA(datum)  (datum).dptr
  87
  88 /* Free the stuff inside the datum. */
  89
  90 #define EXIM_DATUM_FREE(datum)  (free((datum).dptr), (datum).dptr = NULL)
  91
  92 /* No initialization is needed. */
  93
  94 #define EXIM_DATUM_INIT(datum)
  95
  96
  97
  98 /********************* Berkeley db native definitions **********************/
  99
 100 #elif defined USE_DB
 101
 102 #include <db.h>
 103
 104
 105 /* We can distinguish between versions 1.x and 2.x/3.x by looking for a
 106 definition of DB_VERSION_STRING, which is present in versions 2.x onwards. */
 107
 108 #ifdef DB_VERSION_STRING
 109
 110 # if DB_VERSION_MAJOR >= 6
 111 #  error Version 6 and later BDB API is not supported
 112 # endif
 113
 114 /* The API changed (again!) between the 2.x and 3.x versions */
 115
 116 #if DB_VERSION_MAJOR >= 3
 117
 118 /***************** Berkeley db 3.x/4.x native definitions ******************/
 119
 120 /* Basic DB type */
 121 # if DB_VERSION_MAJOR > 4 || (DB_VERSION_MAJOR == 4 && DB_VERSION_MINOR >= 1)
 122 #  define EXIM_DB       DB_ENV
 123 /* Cursor type, for scanning */
 124 #  define EXIM_CURSOR   DBC
 125
 126 /* The datum type used for queries */
 127 #  define EXIM_DATUM    DBT
 128
 129 /* Some text for messages */
 130 #  define EXIM_DBTYPE   "db (v4.1+)"
 131
 132 /* Only more-recent versions.  5+ ? */
 133 #  ifndef DB_FORCESYNC
 134 #   define DB_FORCESYNC 0
 135 #  endif
 136
 137
 138 /* Access functions */
 139
 140 /* EXIM_DBOPEN - sets *dbpp to point to an EXIM_DB, NULL if failed. The
 141 API changed for DB 4.1. - and we also starting using the "env" with a
 142 specified working dir, to avoid the DBCONFIG file trap. */
 143
 144 #  define ENV_TO_DB(env) ((DB *)((env)->app_private))
 145
 146 #  define EXIM_DBOPEN__(name, dirname, flags, mode, dbpp) \
 147   if (  db_env_create(dbpp, 0) != 0                                             \
 148      || ((*dbpp)->set_errcall(*dbpp, dbfn_bdb_error_callback), 0)               \
 149      || (*dbpp)->open(*dbpp, CS dirname, DB_CREATE|DB_INIT_MPOOL|DB_PRIVATE, 0) != 0\
 150      )                                                                          \
 151     *dbpp = NULL;                                       \
 152   else if (db_create((DB **) &((*dbpp)->app_private), *dbpp, 0) != 0)           \
 153     {                                                   \
 154     ((DB_ENV *)(*dbpp))->close((DB_ENV *)(*dbpp), 0);   \
 155     *dbpp = NULL;                                       \
 156     }                                                   \
 157   else if (ENV_TO_DB(*dbpp)->open(ENV_TO_DB(*dbpp), NULL, CS name, NULL,        \
 158               (flags) == O_RDONLY ? DB_UNKNOWN : DB_HASH,                       \
 159               (flags) == O_RDONLY ? DB_RDONLY : DB_CREATE,                      \
 160               mode) != 0                                                        \
 161           )                                                                     \
 162     {                                                   \
 163     ENV_TO_DB(*dbpp)->close(ENV_TO_DB(*dbpp), 0);       \
 164     ((DB_ENV *)(*dbpp))->close((DB_ENV *)(*dbpp), 0);   \
 165     *dbpp = NULL;                                       \
 166     }
 167
 168 /* EXIM_DBGET - returns TRUE if successful, FALSE otherwise */
 169 #  define EXIM_DBGET(db, key, data)      \
 170        (ENV_TO_DB(db)->get(ENV_TO_DB(db), NULL, &key, &data, 0) == 0)
 171
 172 /* EXIM_DBPUT - returns nothing useful, assumes replace mode */
 173 #  define EXIM_DBPUT(db, key, data)      \
 174        ENV_TO_DB(db)->put(ENV_TO_DB(db), NULL, &key, &data, 0)
 175
 176 /* EXIM_DBPUTB - non-overwriting for use by dbmbuild */
 177 #  define EXIM_DBPUTB(db, key, data)      \
 178        ENV_TO_DB(db)->put(ENV_TO_DB(db), NULL, &key, &data, DB_NOOVERWRITE)
 179
 180 /* Return values from EXIM_DBPUTB */
 181
 182 #  define EXIM_DBPUTB_OK  0
 183 #  define EXIM_DBPUTB_DUP DB_KEYEXIST
 184
 185 /* EXIM_DBDEL */
 186 #  define EXIM_DBDEL(db, key)     ENV_TO_DB(db)->del(ENV_TO_DB(db), NULL, &key, 0)
 187
 188 /* EXIM_DBCREATE_CURSOR - initialize for scanning operation */
 189
 190 #  define EXIM_DBCREATE_CURSOR(db, cursor) \
 191        ENV_TO_DB(db)->cursor(ENV_TO_DB(db), NULL, cursor, 0)
 192
 193 /* EXIM_DBSCAN - returns TRUE if data is returned, FALSE at end */
 194 #  define EXIM_DBSCAN(db, key, data, first, cursor)      \
 195        ((cursor)->c_get(cursor, &key, &data,         \
 196          (first? DB_FIRST : DB_NEXT)) == 0)
 197
 198 /* EXIM_DBDELETE_CURSOR - terminate scanning operation */
 199 #  define EXIM_DBDELETE_CURSOR(cursor) \
 200        (cursor)->c_close(cursor)
 201
 202 /* EXIM_DBCLOSE */
 203 #  define EXIM_DBCLOSE__(db) \
 204         (ENV_TO_DB(db)->close(ENV_TO_DB(db), 0) , ((DB_ENV *)(db))->close((DB_ENV *)(db), DB_FORCESYNC))
 205
 206 /* Datum access types - these are intended to be assignable. */
 207
 208 #  define EXIM_DATUM_SIZE(datum)  (datum).size
 209 #  define EXIM_DATUM_DATA(datum)  (datum).data
 210
 211 /* The whole datum structure contains other fields that must be cleared
 212 before use, but we don't have to free anything after reading data. */
 213
 214 #  define EXIM_DATUM_INIT(datum)   memset(&datum, 0, sizeof(datum))
 215 #  define EXIM_DATUM_FREE(datum)
 216
 217 # else  /* pre- 4.1 */
 218
 219 #  define EXIM_DB       DB
 220
 221 /* Cursor type, for scanning */
 222 #  define EXIM_CURSOR   DBC
 223
 224 /* The datum type used for queries */
 225 #  define EXIM_DATUM    DBT
 226
 227 /* Some text for messages */
 228 #  define EXIM_DBTYPE   "db (v3/4)"
 229
 230 /* Access functions */
 231
 232 /* EXIM_DBOPEN - sets *dbpp to point to an EXIM_DB, NULL if failed. */
 233
 234 #  define EXIM_DBOPEN__(name, dirname, flags, mode, dbpp) \
 235        if (db_create(dbpp, NULL, 0) != 0 || \
 236          ((*dbpp)->set_errcall(*dbpp, dbfn_bdb_error_callback), \
 237          ((*dbpp)->open)(*dbpp, CS name, NULL, \
 238          ((flags) == O_RDONLY)? DB_UNKNOWN : DB_HASH, \
 239          ((flags) == O_RDONLY)? DB_RDONLY : DB_CREATE, \
 240          mode)) != 0) *(dbpp) = NULL
 241
 242 /* EXIM_DBGET - returns TRUE if successful, FALSE otherwise */
 243 #  define EXIM_DBGET(db, key, data)      \
 244        ((db)->get(db, NULL, &key, &data, 0) == 0)
 245
 246 /* EXIM_DBPUT - returns nothing useful, assumes replace mode */
 247 #  define EXIM_DBPUT(db, key, data)      \
 248        (db)->put(db, NULL, &key, &data, 0)
 249
 250 /* EXIM_DBPUTB - non-overwriting for use by dbmbuild */
 251 #  define EXIM_DBPUTB(db, key, data)      \
 252        (db)->put(db, NULL, &key, &data, DB_NOOVERWRITE)
 253
 254 /* Return values from EXIM_DBPUTB */
 255
 256 #  define EXIM_DBPUTB_OK  0
 257 #  define EXIM_DBPUTB_DUP DB_KEYEXIST
 258
 259 /* EXIM_DBDEL */
 260 #  define EXIM_DBDEL(db, key)     (db)->del(db, NULL, &key, 0)
 261
 262 /* EXIM_DBCREATE_CURSOR - initialize for scanning operation */
 263
 264 #  define EXIM_DBCREATE_CURSOR(db, cursor) \
 265        (db)->cursor(db, NULL, cursor, 0)
 266
 267 /* EXIM_DBSCAN - returns TRUE if data is returned, FALSE at end */
 268 #  define EXIM_DBSCAN(db, key, data, first, cursor)      \
 269        ((cursor)->c_get(cursor, &key, &data,         \
 270          (first? DB_FIRST : DB_NEXT)) == 0)
 271
 272 /* EXIM_DBDELETE_CURSOR - terminate scanning operation */
 273 #  define EXIM_DBDELETE_CURSOR(cursor) \
 274        (cursor)->c_close(cursor)
 275
 276 /* EXIM_DBCLOSE */
 277 #  define EXIM_DBCLOSE__(db)        (db)->close(db, 0)
 278
 279 /* Datum access types - these are intended to be assignable. */
 280
 281 #  define EXIM_DATUM_SIZE(datum)  (datum).size
 282 #  define EXIM_DATUM_DATA(datum)  (datum).data
 283
 284 /* The whole datum structure contains other fields that must be cleared
 285 before use, but we don't have to free anything after reading data. */
 286
 287 #  define EXIM_DATUM_INIT(datum)   memset(&datum, 0, sizeof(datum))
 288 #  define EXIM_DATUM_FREE(datum)
 289
 290 # endif
 291
 292
 293 #else /* DB_VERSION_MAJOR >= 3 */
 294
 295 /******************* Berkeley db 2.x native definitions ********************/
 296
 297 /* Basic DB type */
 298 #define EXIM_DB       DB
 299
 300 /* Cursor type, for scanning */
 301 #define EXIM_CURSOR   DBC
 302
 303 /* The datum type used for queries */
 304 #define EXIM_DATUM    DBT
 305
 306 /* Some text for messages */
 307 #define EXIM_DBTYPE   "db (v2)"
 308
 309 /* Access functions */
 310
 311 /* EXIM_DBOPEN - sets *dbpp to point to an EXIM_DB, NULL if failed */
 312 #define EXIM_DBOPEN__(name, dirname, flags, mode, dbpp)         \
 313        if ((errno = db_open(CS name, DB_HASH,           \
 314          ((flags) == O_RDONLY)? DB_RDONLY : DB_CREATE, \
 315          mode, NULL, NULL, dbpp)) != 0) *(dbpp) = NULL
 316
 317 /* EXIM_DBGET - returns TRUE if successful, FALSE otherwise */
 318 #define EXIM_DBGET(db, key, data)      \
 319        ((db)->get(db, NULL, &key, &data, 0) == 0)
 320
 321 /* EXIM_DBPUT - returns nothing useful, assumes replace mode */
 322 #define EXIM_DBPUT(db, key, data)      \
 323        (db)->put(db, NULL, &key, &data, 0)
 324
 325 /* EXIM_DBPUTB - non-overwriting for use by dbmbuild */
 326 #define EXIM_DBPUTB(db, key, data)      \
 327        (db)->put(db, NULL, &key, &data, DB_NOOVERWRITE)
 328
 329 /* Return values from EXIM_DBPUTB */
 330
 331 #define EXIM_DBPUTB_OK  0
 332 #define EXIM_DBPUTB_DUP DB_KEYEXIST
 333
 334 /* EXIM_DBDEL */
 335 #define EXIM_DBDEL(db, key)     (db)->del(db, NULL, &key, 0)
 336
 337 /* EXIM_DBCREATE_CURSOR - initialize for scanning operation */
 338
 339 /* The API of this function was changed between releases 2.4.14 and 2.7.3. I do
 340 not know exactly where the change happened, but the Change Log for 2.5.9 lists
 341 the new option that is available, so I guess that it happened at 2.5.x. */
 342
 343 #if DB_VERSION_MINOR >= 5
 344 #define EXIM_DBCREATE_CURSOR(db, cursor) \
 345        (db)->cursor(db, NULL, cursor, 0)
 346 #else
 347 #define EXIM_DBCREATE_CURSOR(db, cursor) \
 348        (db)->cursor(db, NULL, cursor)
 349 #endif
 350
 351 /* EXIM_DBSCAN - returns TRUE if data is returned, FALSE at end */
 352 #define EXIM_DBSCAN(db, key, data, first, cursor)      \
 353        ((cursor)->c_get(cursor, &key, &data,         \
 354          (first? DB_FIRST : DB_NEXT)) == 0)
 355
 356 /* EXIM_DBDELETE_CURSOR - terminate scanning operation */
 357 #define EXIM_DBDELETE_CURSOR(cursor) \
 358        (cursor)->c_close(cursor)
 359
 360 /* EXIM_DBCLOSE */
 361 #define EXIM_DBCLOSE__(db)        (db)->close(db, 0)
 362
 363 /* Datum access types - these are intended to be assignable. */
 364
 365 #define EXIM_DATUM_SIZE(datum)  (datum).size
 366 #define EXIM_DATUM_DATA(datum)  (datum).data
 367
 368 /* The whole datum structure contains other fields that must be cleared
 369 before use, but we don't have to free anything after reading data. */
 370
 371 #define EXIM_DATUM_INIT(datum)   memset(&datum, 0, sizeof(datum))
 372 #define EXIM_DATUM_FREE(datum)
 373
 374 #endif /* DB_VERSION_MAJOR >= 3 */
 375
 376
 377 /* If DB_VERSION_TYPE is not defined, we have version 1.x */
 378
 379 #else  /* DB_VERSION_TYPE */
 380
 381 /******************* Berkeley db 1.x native definitions ********************/
 382
 383 /* Basic DB type */
 384 #define EXIM_DB       DB
 385
 386 /* Cursor type, not used with DB 1.x: just set up a dummy */
 387 #define EXIM_CURSOR   int
 388
 389 /* The datum type used for queries */
 390 #define EXIM_DATUM    DBT
 391
 392 /* Some text for messages */
 393 #define EXIM_DBTYPE   "db (v1)"
 394
 395 /* When scanning, for the non-first case we historically just passed 0
 396 as the flags field and it worked.  On FreeBSD 8 it no longer works and
 397 instead leads to memory exhaustion.  The man-page on FreeBSD says to use
 398 R_NEXT, but this 1.x is a historical fallback and I've no idea how portable
 399 the use of that flag is; so the solution is to define R_NEXT here if it's not
 400 already defined, with a default value of 0 because that's what we've always
 401 before been able to pass successfully. */
 402 #ifndef R_NEXT
 403 #define R_NEXT 0
 404 #endif
 405
 406 /* Access functions */
 407
 408 /* EXIM_DBOPEN - sets *dbpp to point to an EXIM_DB, NULL if failed */
 409 #define EXIM_DBOPEN__(name, dirname, flags, mode, dbpp) \
 410        *(dbpp) = dbopen(CS name, flags, mode, DB_HASH, NULL)
 411
 412 /* EXIM_DBGET - returns TRUE if successful, FALSE otherwise */
 413 #define EXIM_DBGET(db, key, data)      \
 414        ((db)->get(db, &key, &data, 0) == 0)
 415
 416 /* EXIM_DBPUT - returns nothing useful, assumes replace mode */
 417 #define EXIM_DBPUT(db, key, data)      \
 418        (db)->put(db, &key, &data, 0)
 419
 420 /* EXIM_DBPUTB - non-overwriting for use by dbmbuild */
 421 #define EXIM_DBPUTB(db, key, data)      \
 422        (db)->put(db, &key, &data, R_NOOVERWRITE)
 423
 424 /* Returns from EXIM_DBPUTB */
 425
 426 #define EXIM_DBPUTB_OK  0
 427 #define EXIM_DBPUTB_DUP 1
 428
 429 /* EXIM_DBDEL */
 430 #define EXIM_DBDEL(db, key)     (db)->del(db, &key, 0)
 431
 432 /* EXIM_DBCREATE_CURSOR - initialize for scanning operation (null) */
 433 #define EXIM_DBCREATE_CURSOR(db, cursor) {}
 434
 435 /* EXIM_DBSCAN - returns TRUE if data is returned, FALSE at end */
 436 #define EXIM_DBSCAN(db, key, data, first, cursor)      \
 437        ((db)->seq(db, &key, &data, (first? R_FIRST : R_NEXT)) == 0)
 438
 439 /* EXIM_DBDELETE_CURSOR - terminate scanning operation (null). Make it
 440 refer to cursor, to keep picky compilers happy. */
 441 #define EXIM_DBDELETE_CURSOR(cursor) { cursor = cursor; }
 442
 443 /* EXIM_DBCLOSE */
 444 #define EXIM_DBCLOSE__(db)        (db)->close(db)
 445
 446 /* Datum access types - these are intended to be assignable */
 447
 448 #define EXIM_DATUM_SIZE(datum)  (datum).size
 449 #define EXIM_DATUM_DATA(datum)  (datum).data
 450
 451 /* There's no clearing required before use, and we don't have to free anything
 452 after reading data. */
 453
 454 #define EXIM_DATUM_INIT(datum)
 455 #define EXIM_DATUM_FREE(datum)
 456
 457 #endif /* DB_VERSION_STRING */
 458
 459
 460
 461 /********************* gdbm interface definitions **********************/
 462
 463 #elif defined USE_GDBM
 464
 465 #include <gdbm.h>
 466
 467 /* Basic DB type */
 468 typedef struct {
 469        GDBM_FILE gdbm;  /* Database */
 470        datum lkey;      /* Last key, for scans */
 471 } EXIM_DB;
 472
 473 /* Cursor type, not used with gdbm: just set up a dummy */
 474 #define EXIM_CURSOR int
 475
 476 /* The datum type used for queries */
 477 #define EXIM_DATUM datum
 478
 479 /* Some text for messages */
 480
 481 #define EXIM_DBTYPE "gdbm"
 482
 483 /* Access functions */
 484
 485 /* EXIM_DBOPEN - returns a EXIM_DB *, NULL if failed */
 486 #define EXIM_DBOPEN__(name, dirname, flags, mode, dbpp) \
 487      { (*(dbpp)) = (EXIM_DB *) malloc(sizeof(EXIM_DB));\
 488        if (*(dbpp) != NULL) { \
 489          (*(dbpp))->lkey.dptr = NULL;\
 490          (*(dbpp))->gdbm = gdbm_open(CS name, 0, (((flags) & O_CREAT))?GDBM_WRCREAT:(((flags) & (O_RDWR|O_WRONLY))?GDBM_WRITER:GDBM_READER), mode, 0);\
 491           if ((*(dbpp))->gdbm == NULL) {\
 492               free(*(dbpp));\
 493               *(dbpp) = NULL;\
 494           }\
 495        }\
 496      }
 497
 498 /* EXIM_DBGET - returns TRUE if successful, FALSE otherwise */
 499 #define EXIM_DBGET(db, key, data)      \
 500        (data = gdbm_fetch(db->gdbm, key), data.dptr != NULL)
 501
 502 /* EXIM_DBPUT - returns nothing useful, assumes replace mode */
 503 #define EXIM_DBPUT(db, key, data)      \
 504        gdbm_store(db->gdbm, key, data, GDBM_REPLACE)
 505
 506 /* EXIM_DBPUTB - non-overwriting for use by dbmbuild */
 507 #define EXIM_DBPUTB(db, key, data)      \
 508        gdbm_store(db->gdbm, key, data, GDBM_INSERT)
 509
 510 /* Returns from EXIM_DBPUTB */
 511
 512 #define EXIM_DBPUTB_OK  0
 513 #define EXIM_DBPUTB_DUP 1
 514
 515 /* EXIM_DBDEL */
 516 #define EXIM_DBDEL(db, key) gdbm_delete(db->gdbm, key)
 517
 518 /* EXIM_DBCREATE_CURSOR - initialize for scanning operation (null) */
 519 #define EXIM_DBCREATE_CURSOR(db, cursor) {}
 520
 521 /* EXIM_DBSCAN */
 522 #define EXIM_DBSCAN(db, key, data, first, cursor)      \
 523   ( key = ((first)? gdbm_firstkey(db->gdbm) : gdbm_nextkey(db->gdbm, db->lkey)), \
 524     (((db)->lkey.dptr != NULL)? (free((db)->lkey.dptr),1) : 1),\
 525     db->lkey = key, key.dptr != NULL)
 526
 527 /* EXIM_DBDELETE_CURSOR - terminate scanning operation (null). Make it
 528 refer to cursor, to keep picky compilers happy. */
 529 #define EXIM_DBDELETE_CURSOR(cursor) { cursor = cursor; }
 530
 531 /* EXIM_DBCLOSE */
 532 #define EXIM_DBCLOSE__(db) \
 533 { gdbm_close((db)->gdbm);\
 534   if ((db)->lkey.dptr != NULL) free((db)->lkey.dptr);\
 535   free(db); }
 536
 537 /* Datum access types - these are intended to be assignable */
 538
 539 #define EXIM_DATUM_SIZE(datum) (datum).dsize
 540 #define EXIM_DATUM_DATA(datum) (datum).dptr
 541
 542 /* There's no clearing required before use, but we have to free the dptr
 543 after reading data. */
 544
 545 #define EXIM_DATUM_INIT(datum)
 546 #define EXIM_DATUM_FREE(datum) free(datum.dptr)
 547
 548 #else  /* USE_GDBM */
 549
 550
 551 /* If none of USE_DB, USG_GDBM, or USE_TDB are set, the default is the NDBM
 552 interface */
 553
 554
 555 /********************* ndbm interface definitions **********************/
 556
 557 #include <ndbm.h>
 558
 559 /* Basic DB type */
 560 #define EXIM_DB DBM
 561
 562 /* Cursor type, not used with ndbm: just set up a dummy */
 563 #define EXIM_CURSOR int
 564
 565 /* The datum type used for queries */
 566 #define EXIM_DATUM datum
 567
 568 /* Some text for messages */
 569
 570 #define EXIM_DBTYPE "ndbm"
 571
 572 /* Access functions */
 573
 574 /* EXIM_DBOPEN - returns a EXIM_DB *, NULL if failed */
 575 #define EXIM_DBOPEN__(name, dirname, flags, mode, dbpp) \
 576        *(dbpp) = dbm_open(CS name, flags, mode)
 577
 578 /* EXIM_DBGET - returns TRUE if successful, FALSE otherwise */
 579 #define EXIM_DBGET(db, key, data)      \
 580        (data = dbm_fetch(db, key), data.dptr != NULL)
 581
 582 /* EXIM_DBPUT - returns nothing useful, assumes replace mode */
 583 #define EXIM_DBPUT(db, key, data)      \
 584        dbm_store(db, key, data, DBM_REPLACE)
 585
 586 /* EXIM_DBPUTB - non-overwriting for use by dbmbuild */
 587 #define EXIM_DBPUTB(db, key, data)      \
 588        dbm_store(db, key, data, DBM_INSERT)
 589
 590 /* Returns from EXIM_DBPUTB */
 591
 592 #define EXIM_DBPUTB_OK  0
 593 #define EXIM_DBPUTB_DUP 1
 594
 595 /* EXIM_DBDEL */
 596 #define EXIM_DBDEL(db, key) dbm_delete(db, key)
 597
 598 /* EXIM_DBCREATE_CURSOR - initialize for scanning operation (null) */
 599 #define EXIM_DBCREATE_CURSOR(db, cursor) {}
 600
 601 /* EXIM_DBSCAN */
 602 #define EXIM_DBSCAN(db, key, data, first, cursor)      \
 603        (key = (first? dbm_firstkey(db) : dbm_nextkey(db)), key.dptr != NULL)
 604
 605 /* EXIM_DBDELETE_CURSOR - terminate scanning operation (null). Make it
 606 refer to cursor, to keep picky compilers happy. */
 607 #define EXIM_DBDELETE_CURSOR(cursor) { cursor = cursor; }
 608
 609 /* EXIM_DBCLOSE */
 610 #define EXIM_DBCLOSE__(db) dbm_close(db)
 611
 612 /* Datum access types - these are intended to be assignable */
 613
 614 #define EXIM_DATUM_SIZE(datum) (datum).dsize
 615 #define EXIM_DATUM_DATA(datum) (datum).dptr
 616
 617 /* There's no clearing required before use, and we don't have to free anything
 618 after reading data. */
 619
 620 #define EXIM_DATUM_INIT(datum)
 621 #define EXIM_DATUM_FREE(datum)
 622
 623 #endif /* USE_GDBM */
 624
 625
 626
 627
 628
 629 # ifdef COMPILE_UTILITY
 630
 631 #  define EXIM_DBOPEN(name, dirname, flags, mode, dbpp) \
 632   EXIM_DBOPEN__(name, dirname, flags, mode, dbpp)
 633 #  define EXIM_DBCLOSE(db) EXIM_DBCLOSE__(db)
 634
 635 # else
 636
 637 #  define EXIM_DBOPEN(name, dirname, flags, mode, dbpp) \
 638   do { \
 639   DEBUG(D_hints_lookup) \
 640     debug_printf_indent("EXIM_DBOPEN: file <%s> dir <%s> flags=%s\n", \
 641       (name), (dirname),                \
 642       (flags) == O_RDONLY ? "O_RDONLY"  \
 643       : (flags) == O_RDWR ? "O_RDWR"    \
 644       : (flags) == (O_RDWR|O_CREAT) ? "O_RDWR|O_CREAT"  \
 645       : "??");  \
 646   if (is_tainted(name) || is_tainted(dirname)) \
 647     { \
 648     log_write(0, LOG_MAIN|LOG_PANIC, "Tainted name for DB file not permitted"); \
 649     *dbpp = NULL; \
 650     } \
 651   else \
 652     { EXIM_DBOPEN__(name, dirname, flags, mode, dbpp); } \
 653   DEBUG(D_hints_lookup) debug_printf_indent("returned from EXIM_DBOPEN: %p\n", *dbpp); \
 654   } while(0)
 655 #  define EXIM_DBCLOSE(db) \
 656   do { \
 657   DEBUG(D_hints_lookup) debug_printf_indent("EXIM_DBCLOSE(%p)\n", db); \
 658   EXIM_DBCLOSE__(db); \
 659   } while(0)
 660
 661 #  endif
 662
 663 /********************* End of dbm library definitions **********************/
 664
 665
 666 /* Structure for carrying around an open DBM file, and an open locking file
 667 that relates to it. */
 668
 669 typedef struct {
 670   EXIM_DB *dbptr;
 671   int lockfd;
 672 } open_db;
 673
 674
 675 /* Structures for records stored in exim database dbm files. They all
 676 start with the same fields, described in the generic type. */
 677
 678
 679 typedef struct {
 680   time_t time_stamp;      /* Timestamp of writing */
 681 } dbdata_generic;
 682
 683
 684 /* This structure keeps track of retry information for a host or a local
 685 address. */
 686
 687 typedef struct {
 688   time_t time_stamp;
 689   /*************/
 690   time_t first_failed;    /* Time of first failure */
 691   time_t last_try;        /* Time of last try */
 692   time_t next_try;        /* Time of next try */
 693   BOOL   expired;         /* Retry time has expired */
 694   int    basic_errno;     /* Errno of last failure */
 695   int    more_errno;      /* Additional information */
 696   uschar text[1];         /* Text message for last failure */
 697 } dbdata_retry;
 698
 699 /* These structures keep track of addresses that have had callout verification
 700 performed on them. There are two groups of records:
 701
 702 1. keyed by localpart@domain -
 703      Full address was tested and record holds result
 704
 705 2. keyed by domain -
 706      Domain response upto MAIL FROM:<>, postmaster, random local part;
 707
 708 If a record exists, the result field is either ccache_accept or ccache_reject,
 709 or, for a domain record only, ccache_reject_mfnull when MAIL FROM:<> was
 710 rejected. The other fields, however, (which are only relevant to domain
 711 records) may also contain ccache_unknown if that particular test has not been
 712 done.
 713
 714 Originally, there was only one structure, used for both types. However, it got
 715 expanded for domain records, so it got split. To make it possible for Exim to
 716 handle the old type of record, we retain the old definition. The different
 717 kinds of record can be distinguished by their different lengths. */
 718
 719 typedef struct {
 720   time_t time_stamp;
 721   /*************/
 722   int   result;
 723   int   postmaster_result; /* Postmaster is accepted */
 724   int   random_result;     /* Random local part was accepted */
 725 } dbdata_callout_cache_obs;
 726
 727 typedef struct {
 728   time_t time_stamp;       /* Timestamp of last address check */
 729   /*************/
 730   int   result;            /* accept or reject */
 731 } dbdata_callout_cache_address;
 732
 733 /* For this new layout, we put the additional fields (the timestamps)
 734 last so that if somebody reverts to an older Exim, the new records will
 735 still make sense because they match the old layout. */
 736
 737 typedef struct {
 738   time_t time_stamp;       /* Time stamp of last connection */
 739   /*************/
 740   int   result;            /* Domain reject or accept */
 741   int   postmaster_result; /* Postmaster result */
 742   int   random_result;     /* Random result */
 743   time_t postmaster_stamp; /* Timestamp of postmaster check */
 744   time_t random_stamp;     /* Timestamp of random check */
 745 } dbdata_callout_cache;
 746
 747 /* This structure keeps track of messages that are waiting for a particular
 748 host for a particular transport. */
 749
 750 typedef struct {
 751   time_t time_stamp;
 752   /*************/
 753   int    count;           /* Count of message ids */
 754   int    sequence;        /* Sequence for continued records */
 755   uschar text[1];         /* One long character string */
 756 } dbdata_wait;
 757
 758
 759 /* The contents of the "misc" database are a mixture of different kinds of
 760 record, as defined below. The keys used for a specific type all start with a
 761 given string such as "etrn-" or "host-serialize-". */
 762
 763
 764 /* This structure records a connection to a particular host, for the
 765 purpose of serializing access to certain hosts. For possible future extension,
 766 a field is defined for holding the count of connections, but it is not
 767 at present in use. The same structure is used for recording a running ETRN
 768 process. */
 769
 770 typedef struct {
 771   time_t time_stamp;
 772   /*************/
 773   int    count;           /* Reserved for possible connection count */
 774 } dbdata_serialize;
 775
 776
 777 /* This structure records the information required for the ratelimit
 778 ACL condition. */
 779
 780 typedef struct {
 781   time_t time_stamp;
 782   /*************/
 783   int    time_usec;       /* Fractional part of time, from gettimeofday() */
 784   double rate;            /* Smoothed sending rate at that time */
 785 } dbdata_ratelimit;
 786
 787 /* Same as above, plus a Bloom filter for uniquifying events. */
 788
 789 typedef struct {
 790   dbdata_ratelimit dbd;
 791   time_t   bloom_epoch;   /* When the Bloom filter was last reset */
 792   unsigned bloom_size;    /* Number of bytes in the Bloom filter */
 793   uschar   bloom[40];     /* Bloom filter which may be larger than this */
 794 } dbdata_ratelimit_unique;
 795
 796 #ifndef DISABLE_PIPE_CONNECT
 797 /* This structure records the EHLO responses, cleartext and crypted,
 798 for an IP, as bitmasks (cf. OPTION_TLS) */
 799
 800 typedef struct {
 801   unsigned short cleartext_features;
 802   unsigned short crypted_features;
 803   unsigned short cleartext_auths;
 804   unsigned short crypted_auths;
 805 } ehlo_resp_precis;
 806
 807 typedef struct {
 808   time_t time_stamp;
 809   /*************/
 810   ehlo_resp_precis data;
 811 } dbdata_ehlo_resp;
 812 #endif
 813
 814 typedef struct {
 815   time_t time_stamp;
 816   /*************/
 817   uschar verify_override:1;
 818   uschar ocsp:3;
 819   uschar session[1];
 820 } dbdata_tls_session;
 821
 822
 823 /* End of dbstuff.h */