xref: /titanic_44/usr/src/cmd/sendmail/libsmdb/smndbm.c (revision 7eea693d6b672899726e75993fddc4e95b52647f) 
1 /*
2 ** Copyright (c) 1999-2002 Sendmail, Inc. and its suppliers.
3 **	All rights reserved.
4 **
5 ** By using this file, you agree to the terms and conditions set
6 ** forth in the LICENSE file which can be found at the top level of
7 ** the sendmail distribution.
8 */
9 
10 #pragma ident	"%Z%%M%	%I%	%E% SMI"
11 
12 #include <sm/gen.h>
13 SM_RCSID("@(#)$Id: smndbm.c,v 8.52 2002/05/21 22:30:30 gshapiro Exp $")
14 
15 #include <fcntl.h>
16 #include <stdlib.h>
17 #include <unistd.h>
18 
19 #include <sendmail/sendmail.h>
20 #include <libsmdb/smdb.h>
21 
22 #ifdef NDBM
23 
24 # define SMNDB_DIR_FILE_EXTENSION "dir"
25 # define SMNDB_PAG_FILE_EXTENSION "pag"
26 
27 struct smdb_dbm_database_struct
28 {
29 	DBM	*smndbm_dbm;
30 	int	smndbm_lock_fd;
31 	bool	smndbm_cursor_in_use;
32 };
33 typedef struct smdb_dbm_database_struct SMDB_DBM_DATABASE;
34 
35 struct smdb_dbm_cursor_struct
36 {
37 	SMDB_DBM_DATABASE	*smndbmc_db;
38 	datum			smndbmc_current_key;
39 };
40 typedef struct smdb_dbm_cursor_struct SMDB_DBM_CURSOR;
41 
42 /*
43 **  SMDB_PUT_FLAGS_TO_NDBM_FLAGS -- Translates smdb put flags to ndbm put flags.
44 **
45 **	Parameters:
46 **		flags -- The flags to translate.
47 **
48 **	Returns:
49 **		The ndbm flags that are equivalent to the smdb flags.
50 **
51 **	Notes:
52 **		Any invalid flags are ignored.
53 **
54 */
55 
56 int
57 smdb_put_flags_to_ndbm_flags(flags)
58 	SMDB_FLAG flags;
59 {
60 	int return_flags;
61 
62 	return_flags = 0;
63 	if (bitset(SMDBF_NO_OVERWRITE, flags))
64 		return_flags = DBM_INSERT;
65 	else
66 		return_flags = DBM_REPLACE;
67 
68 	return return_flags;
69 }
70 
71 /*
72 **  Except for smdb_ndbm_open, the rest of these function correspond to the
73 **  interface laid out in smdb.h.
74 */
75 
76 SMDB_DBM_DATABASE *
77 smdbm_malloc_database()
78 {
79 	SMDB_DBM_DATABASE *db;
80 
81 	db = (SMDB_DBM_DATABASE *) malloc(sizeof(SMDB_DBM_DATABASE));
82 	if (db != NULL)
83 	{
84 		db->smndbm_dbm = NULL;
85 		db->smndbm_lock_fd = -1;
86 		db->smndbm_cursor_in_use = false;
87 	}
88 
89 	return db;
90 }
91 
92 int
93 smdbm_close(database)
94 	SMDB_DATABASE *database;
95 {
96 	SMDB_DBM_DATABASE *db = (SMDB_DBM_DATABASE *) database->smdb_impl;
97 	DBM *dbm = ((SMDB_DBM_DATABASE *) database->smdb_impl)->smndbm_dbm;
98 
99 	dbm_close(dbm);
100 	if (db->smndbm_lock_fd != -1)
101 		close(db->smndbm_lock_fd);
102 
103 	free(db);
104 	database->smdb_impl = NULL;
105 
106 	return SMDBE_OK;
107 }
108 
109 int
110 smdbm_del(database, key, flags)
111 	SMDB_DATABASE *database;
112 	SMDB_DBENT *key;
113 	unsigned int flags;
114 {
115 	int result;
116 	DBM *dbm = ((SMDB_DBM_DATABASE *) database->smdb_impl)->smndbm_dbm;
117 	datum dbkey;
118 
119 	(void) memset(&dbkey, '\0', sizeof dbkey);
120 	dbkey.dptr = key->data;
121 	dbkey.dsize = key->size;
122 
123 	errno = 0;
124 	result = dbm_delete(dbm, dbkey);
125 	if (result != 0)
126 	{
127 		int save_errno = errno;
128 
129 		if (dbm_error(dbm))
130 			return SMDBE_IO_ERROR;
131 
132 		if (save_errno != 0)
133 			return save_errno;
134 
135 		return SMDBE_NOT_FOUND;
136 	}
137 	return SMDBE_OK;
138 }
139 
140 int
141 smdbm_fd(database, fd)
142 	SMDB_DATABASE *database;
143 	int *fd;
144 {
145 	DBM *dbm = ((SMDB_DBM_DATABASE *) database->smdb_impl)->smndbm_dbm;
146 
147 	*fd = dbm_dirfno(dbm);
148 	if (*fd <= 0)
149 		return EINVAL;
150 
151 	return SMDBE_OK;
152 }
153 
154 int
155 smdbm_lockfd(database)
156 	SMDB_DATABASE *database;
157 {
158 	SMDB_DBM_DATABASE *db = (SMDB_DBM_DATABASE *) database->smdb_impl;
159 
160 	return db->smndbm_lock_fd;
161 }
162 
163 int
164 smdbm_get(database, key, data, flags)
165 	SMDB_DATABASE *database;
166 	SMDB_DBENT *key;
167 	SMDB_DBENT *data;
168 	unsigned int flags;
169 {
170 	DBM *dbm = ((SMDB_DBM_DATABASE *) database->smdb_impl)->smndbm_dbm;
171 	datum dbkey, dbdata;
172 
173 	(void) memset(&dbkey, '\0', sizeof dbkey);
174 	(void) memset(&dbdata, '\0', sizeof dbdata);
175 	dbkey.dptr = key->data;
176 	dbkey.dsize = key->size;
177 
178 	errno = 0;
179 	dbdata = dbm_fetch(dbm, dbkey);
180 	if (dbdata.dptr == NULL)
181 	{
182 		int save_errno = errno;
183 
184 		if (dbm_error(dbm))
185 			return SMDBE_IO_ERROR;
186 
187 		if (save_errno != 0)
188 			return save_errno;
189 
190 		return SMDBE_NOT_FOUND;
191 	}
192 	data->data = dbdata.dptr;
193 	data->size = dbdata.dsize;
194 	return SMDBE_OK;
195 }
196 
197 int
198 smdbm_put(database, key, data, flags)
199 	SMDB_DATABASE *database;
200 	SMDB_DBENT *key;
201 	SMDB_DBENT *data;
202 	unsigned int flags;
203 {
204 	int result;
205 	int save_errno;
206 	DBM *dbm = ((SMDB_DBM_DATABASE *) database->smdb_impl)->smndbm_dbm;
207 	datum dbkey, dbdata;
208 
209 	(void) memset(&dbkey, '\0', sizeof dbkey);
210 	(void) memset(&dbdata, '\0', sizeof dbdata);
211 	dbkey.dptr = key->data;
212 	dbkey.dsize = key->size;
213 	dbdata.dptr = data->data;
214 	dbdata.dsize = data->size;
215 
216 	errno = 0;
217 	result = dbm_store(dbm, dbkey, dbdata,
218 			   smdb_put_flags_to_ndbm_flags(flags));
219 	switch (result)
220 	{
221 	  case 1:
222 		return SMDBE_DUPLICATE;
223 
224 	  case 0:
225 		return SMDBE_OK;
226 
227 	  default:
228 		save_errno = errno;
229 
230 		if (dbm_error(dbm))
231 			return SMDBE_IO_ERROR;
232 
233 		if (save_errno != 0)
234 			return save_errno;
235 
236 		return SMDBE_IO_ERROR;
237 	}
238 	/* NOTREACHED */
239 }
240 
241 int
242 smndbm_set_owner(database, uid, gid)
243 	SMDB_DATABASE *database;
244 	uid_t uid;
245 	gid_t gid;
246 {
247 # if HASFCHOWN
248 	int fd;
249 	int result;
250 	DBM *dbm = ((SMDB_DBM_DATABASE *) database->smdb_impl)->smndbm_dbm;
251 
252 	fd = dbm_dirfno(dbm);
253 	if (fd <= 0)
254 		return EINVAL;
255 
256 	result = fchown(fd, uid, gid);
257 	if (result < 0)
258 		return errno;
259 
260 	fd = dbm_pagfno(dbm);
261 	if (fd <= 0)
262 		return EINVAL;
263 
264 	result = fchown(fd, uid, gid);
265 	if (result < 0)
266 		return errno;
267 # endif /* HASFCHOWN */
268 
269 	return SMDBE_OK;
270 }
271 
272 int
273 smdbm_sync(database, flags)
274 	SMDB_DATABASE *database;
275 	unsigned int flags;
276 {
277 	return SMDBE_UNSUPPORTED;
278 }
279 
280 int
281 smdbm_cursor_close(cursor)
282 	SMDB_CURSOR *cursor;
283 {
284 	SMDB_DBM_CURSOR *dbm_cursor = (SMDB_DBM_CURSOR *) cursor->smdbc_impl;
285 	SMDB_DBM_DATABASE *db = dbm_cursor->smndbmc_db;
286 
287 	if (!db->smndbm_cursor_in_use)
288 		return SMDBE_NOT_A_VALID_CURSOR;
289 
290 	db->smndbm_cursor_in_use = false;
291 	free(dbm_cursor);
292 	free(cursor);
293 
294 	return SMDBE_OK;
295 }
296 
297 int
298 smdbm_cursor_del(cursor, flags)
299 	SMDB_CURSOR *cursor;
300 	unsigned int flags;
301 {
302 	int result;
303 	SMDB_DBM_CURSOR *dbm_cursor = (SMDB_DBM_CURSOR *) cursor->smdbc_impl;
304 	SMDB_DBM_DATABASE *db = dbm_cursor->smndbmc_db;
305 	DBM *dbm = db->smndbm_dbm;
306 
307 	errno = 0;
308 	result = dbm_delete(dbm, dbm_cursor->smndbmc_current_key);
309 	if (result != 0)
310 	{
311 		int save_errno = errno;
312 
313 		if (dbm_error(dbm))
314 			return SMDBE_IO_ERROR;
315 
316 		if (save_errno != 0)
317 			return save_errno;
318 
319 		return SMDBE_NOT_FOUND;
320 	}
321 	return SMDBE_OK;
322 }
323 
324 int
325 smdbm_cursor_get(cursor, key, value, flags)
326 	SMDB_CURSOR *cursor;
327 	SMDB_DBENT *key;
328 	SMDB_DBENT *value;
329 	SMDB_FLAG flags;
330 {
331 	SMDB_DBM_CURSOR *dbm_cursor = (SMDB_DBM_CURSOR *) cursor->smdbc_impl;
332 	SMDB_DBM_DATABASE *db = dbm_cursor->smndbmc_db;
333 	DBM *dbm = db->smndbm_dbm;
334 	datum dbkey, dbdata;
335 
336 	(void) memset(&dbkey, '\0', sizeof dbkey);
337 	(void) memset(&dbdata, '\0', sizeof dbdata);
338 
339 	if (flags == SMDB_CURSOR_GET_RANGE)
340 		return SMDBE_UNSUPPORTED;
341 
342 	if (dbm_cursor->smndbmc_current_key.dptr == NULL)
343 	{
344 		dbm_cursor->smndbmc_current_key = dbm_firstkey(dbm);
345 		if (dbm_cursor->smndbmc_current_key.dptr == NULL)
346 		{
347 			if (dbm_error(dbm))
348 				return SMDBE_IO_ERROR;
349 			return SMDBE_LAST_ENTRY;
350 		}
351 	}
352 	else
353 	{
354 		dbm_cursor->smndbmc_current_key = dbm_nextkey(dbm);
355 		if (dbm_cursor->smndbmc_current_key.dptr == NULL)
356 		{
357 			if (dbm_error(dbm))
358 				return SMDBE_IO_ERROR;
359 			return SMDBE_LAST_ENTRY;
360 		}
361 	}
362 
363 	errno = 0;
364 	dbdata = dbm_fetch(dbm, dbm_cursor->smndbmc_current_key);
365 	if (dbdata.dptr == NULL)
366 	{
367 		int save_errno = errno;
368 
369 		if (dbm_error(dbm))
370 			return SMDBE_IO_ERROR;
371 
372 		if (save_errno != 0)
373 			return save_errno;
374 
375 		return SMDBE_NOT_FOUND;
376 	}
377 	value->data = dbdata.dptr;
378 	value->size = dbdata.dsize;
379 	key->data = dbm_cursor->smndbmc_current_key.dptr;
380 	key->size = dbm_cursor->smndbmc_current_key.dsize;
381 
382 	return SMDBE_OK;
383 }
384 
385 int
386 smdbm_cursor_put(cursor, key, value, flags)
387 	SMDB_CURSOR *cursor;
388 	SMDB_DBENT *key;
389 	SMDB_DBENT *value;
390 	SMDB_FLAG flags;
391 {
392 	int result;
393 	int save_errno;
394 	SMDB_DBM_CURSOR *dbm_cursor = (SMDB_DBM_CURSOR *) cursor->smdbc_impl;
395 	SMDB_DBM_DATABASE *db = dbm_cursor->smndbmc_db;
396 	DBM *dbm = db->smndbm_dbm;
397 	datum dbdata;
398 
399 	(void) memset(&dbdata, '\0', sizeof dbdata);
400 	dbdata.dptr = value->data;
401 	dbdata.dsize = value->size;
402 
403 	errno = 0;
404 	result = dbm_store(dbm, dbm_cursor->smndbmc_current_key, dbdata,
405 			   smdb_put_flags_to_ndbm_flags(flags));
406 	switch (result)
407 	{
408 	  case 1:
409 		return SMDBE_DUPLICATE;
410 
411 	  case 0:
412 		return SMDBE_OK;
413 
414 	  default:
415 		save_errno = errno;
416 
417 		if (dbm_error(dbm))
418 			return SMDBE_IO_ERROR;
419 
420 		if (save_errno != 0)
421 			return save_errno;
422 
423 		return SMDBE_IO_ERROR;
424 	}
425 	/* NOTREACHED */
426 }
427 
428 int
429 smdbm_cursor(database, cursor, flags)
430 	SMDB_DATABASE *database;
431 	SMDB_CURSOR **cursor;
432 	SMDB_FLAG flags;
433 {
434 	SMDB_DBM_DATABASE *db = (SMDB_DBM_DATABASE *) database->smdb_impl;
435 	SMDB_CURSOR *cur;
436 	SMDB_DBM_CURSOR *dbm_cursor;
437 
438 	if (db->smndbm_cursor_in_use)
439 		return SMDBE_ONLY_SUPPORTS_ONE_CURSOR;
440 
441 	db->smndbm_cursor_in_use = true;
442 	dbm_cursor = (SMDB_DBM_CURSOR *) malloc(sizeof(SMDB_DBM_CURSOR));
443 	dbm_cursor->smndbmc_db = db;
444 	dbm_cursor->smndbmc_current_key.dptr = NULL;
445 	dbm_cursor->smndbmc_current_key.dsize = 0;
446 
447 	cur = (SMDB_CURSOR*) malloc(sizeof(SMDB_CURSOR));
448 	if (cur == NULL)
449 		return SMDBE_MALLOC;
450 
451 	cur->smdbc_impl = dbm_cursor;
452 	cur->smdbc_close = smdbm_cursor_close;
453 	cur->smdbc_del = smdbm_cursor_del;
454 	cur->smdbc_get = smdbm_cursor_get;
455 	cur->smdbc_put = smdbm_cursor_put;
456 	*cursor = cur;
457 
458 	return SMDBE_OK;
459 }
460 /*
461 **  SMDB_NDBM_OPEN -- Opens a ndbm database.
462 **
463 **	Parameters:
464 **		database -- An unallocated database pointer to a pointer.
465 **		db_name -- The name of the database without extension.
466 **		mode -- File permisions on a created database.
467 **		mode_mask -- Mode bits that much match on an opened database.
468 **		sff -- Flags to safefile.
469 **		type -- The type of database to open.
470 **			Only SMDB_NDBM is supported.
471 **		user_info -- Information on the user to use for file
472 **			    permissions.
473 **		db_params -- No params are supported.
474 **
475 **	Returns:
476 **		SMDBE_OK -- Success, otherwise errno:
477 **		SMDBE_MALLOC -- Cannot allocate memory.
478 **		SMDBE_UNSUPPORTED -- The type is not supported.
479 **		SMDBE_GDBM_IS_BAD -- We have detected GDBM and we don't
480 **				    like it.
481 **		SMDBE_BAD_OPEN -- dbm_open failed and errno was not set.
482 **		Anything else: errno
483 */
484 
485 int
486 smdb_ndbm_open(database, db_name, mode, mode_mask, sff, type, user_info,
487 	       db_params)
488 	SMDB_DATABASE **database;
489 	char *db_name;
490 	int mode;
491 	int mode_mask;
492 	long sff;
493 	SMDB_DBTYPE type;
494 	SMDB_USER_INFO *user_info;
495 	SMDB_DBPARAMS *db_params;
496 {
497 	bool lockcreated = false;
498 	int result;
499 	int lock_fd;
500 	SMDB_DATABASE *smdb_db;
501 	SMDB_DBM_DATABASE *db;
502 	DBM *dbm = NULL;
503 	struct stat dir_stat_info;
504 	struct stat pag_stat_info;
505 
506 	result = SMDBE_OK;
507 	*database = NULL;
508 
509 	if (type == NULL)
510 		return SMDBE_UNKNOWN_DB_TYPE;
511 
512 	result = smdb_setup_file(db_name, SMNDB_DIR_FILE_EXTENSION, mode_mask,
513 				 sff, user_info, &dir_stat_info);
514 	if (result != SMDBE_OK)
515 		return result;
516 
517 	result = smdb_setup_file(db_name, SMNDB_PAG_FILE_EXTENSION, mode_mask,
518 				 sff, user_info, &pag_stat_info);
519 	if (result != SMDBE_OK)
520 		return result;
521 
522 	if ((dir_stat_info.st_mode == ST_MODE_NOFILE ||
523 	     pag_stat_info.st_mode == ST_MODE_NOFILE) &&
524 	    bitset(mode, O_CREAT))
525 		lockcreated = true;
526 
527 	lock_fd = -1;
528 	result = smdb_lock_file(&lock_fd, db_name, mode, sff,
529 				SMNDB_DIR_FILE_EXTENSION);
530 	if (result != SMDBE_OK)
531 		return result;
532 
533 	if (lockcreated)
534 	{
535 		int pag_fd;
536 
537 		/* Need to pre-open the .pag file as well with O_EXCL */
538 		result = smdb_lock_file(&pag_fd, db_name, mode, sff,
539 					SMNDB_PAG_FILE_EXTENSION);
540 		if (result != SMDBE_OK)
541 		{
542 			(void) close(lock_fd);
543 			return result;
544 		}
545 		(void) close(pag_fd);
546 
547 		mode |= O_TRUNC;
548 		mode &= ~(O_CREAT|O_EXCL);
549 	}
550 
551 	smdb_db = smdb_malloc_database();
552 	if (smdb_db == NULL)
553 		result = SMDBE_MALLOC;
554 
555 	db = smdbm_malloc_database();
556 	if (db == NULL)
557 		result = SMDBE_MALLOC;
558 
559 	/* Try to open database */
560 	if (result == SMDBE_OK)
561 	{
562 		db->smndbm_lock_fd = lock_fd;
563 
564 		errno = 0;
565 		dbm = dbm_open(db_name, mode, DBMMODE);
566 		if (dbm == NULL)
567 		{
568 			if (errno == 0)
569 				result = SMDBE_BAD_OPEN;
570 			else
571 				result = errno;
572 		}
573 		db->smndbm_dbm = dbm;
574 	}
575 
576 	/* Check for GDBM */
577 	if (result == SMDBE_OK)
578 	{
579 		if (dbm_dirfno(dbm) == dbm_pagfno(dbm))
580 			result = SMDBE_GDBM_IS_BAD;
581 	}
582 
583 	/* Check for filechanged */
584 	if (result == SMDBE_OK)
585 	{
586 		result = smdb_filechanged(db_name, SMNDB_DIR_FILE_EXTENSION,
587 					  dbm_dirfno(dbm), &dir_stat_info);
588 		if (result == SMDBE_OK)
589 		{
590 			result = smdb_filechanged(db_name,
591 						  SMNDB_PAG_FILE_EXTENSION,
592 						  dbm_pagfno(dbm),
593 						  &pag_stat_info);
594 		}
595 	}
596 
597 	/* XXX Got to get fchown stuff in here */
598 
599 	/* Setup driver if everything is ok */
600 	if (result == SMDBE_OK)
601 	{
602 		*database = smdb_db;
603 
604 		smdb_db->smdb_close = smdbm_close;
605 		smdb_db->smdb_del = smdbm_del;
606 		smdb_db->smdb_fd = smdbm_fd;
607 		smdb_db->smdb_lockfd = smdbm_lockfd;
608 		smdb_db->smdb_get = smdbm_get;
609 		smdb_db->smdb_put = smdbm_put;
610 		smdb_db->smdb_set_owner = smndbm_set_owner;
611 		smdb_db->smdb_sync = smdbm_sync;
612 		smdb_db->smdb_cursor = smdbm_cursor;
613 
614 		smdb_db->smdb_impl = db;
615 
616 		return SMDBE_OK;
617 	}
618 
619 	/* If we're here, something bad happened, clean up */
620 	if (dbm != NULL)
621 		dbm_close(dbm);
622 
623 	smdb_unlock_file(db->smndbm_lock_fd);
624 	free(db);
625 	smdb_free_database(smdb_db);
626 
627 	return result;
628 }
629 #endif /* NDBM */
630