summaryrefslogtreecommitdiff
path: root/usr.sbin/ypserv/common/ypdb.c
blob: f166473431938721ffc21af8dfcd5676bea68b68 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
/*	$NetBSD: ypdb.c,v 1.12 2017/01/10 21:06:17 christos Exp $	*/

/*
 * Copyright (c) 1990, 1993
 *	The Regents of the University of California.  All rights reserved.
 * All rights reserved.
 *
 * This code is derived from software contributed to Berkeley by
 * Margo Seltzer.
 *
 * This code is derived from ndbm module of BSD4.4 db (hash) by
 * Mats O Jansson
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS
 * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#include <sys/cdefs.h>
#ifndef lint
__RCSID("$NetBSD: ypdb.c,v 1.12 2017/01/10 21:06:17 christos Exp $");
#endif

#include <sys/param.h>
#include <sys/types.h>
#include <sys/stat.h>

#include <db.h>
#include <err.h>
#include <errno.h>
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>

#include <rpcsvc/yp.h>

#include "ypdb.h"

static DBM	*_ypdb_dbopen(const char *, int, mode_t);

/*
 * ypdb_open --
 *	dbopen(3) file, read-only.
 *	First ensure that file has a suffix of YPDB_SUFFIX.
 *	Try opening as a DB_BTREE first, then DB_HASH.
 *
 * Returns:
 *	*DBM on success
 *	 NULL on failure
 */

DBM *
ypdb_open(const char *file)
{
	char path[MAXPATHLEN];
	const char *cp, *suffix;

	cp = strrchr(file, '.');
	if (cp != NULL && strcmp(cp, YPDB_SUFFIX) == 0)
		suffix = "";
	else
		suffix = YPDB_SUFFIX;
	if (strlen(file) + strlen(suffix) > (sizeof(path) - 1)) {
		warnx("File name `%s' is too long", file);
		return (NULL);
	}
	snprintf(path, sizeof(path), "%s%s", file, suffix);
	return _ypdb_dbopen(path, O_RDONLY, 0444);
}

/*
 * ypdb_mktemp --
 *	Create a temporary file using mkstemp(3) based on the
 *	template provided in file.
 *	dbopen(3) file, read-write, 0644 (modified by umask(2)).
 *	Try opening as a DB_BTREE first, then DB_HASH.
 *	file won't have YPDB_SUFFIX.
 *
 * Returns:
 *	*DBM on success; file now exists.
 *	 NULL on failure
 */

DBM *
ypdb_mktemp(char *file)
{
	int fd = -1;
	DBM *db = NULL;
	mode_t myumask;
	int save_errno;

	if ((fd = mkstemp(file)) == -1)
		return NULL;

	myumask = umask(0);
	(void)umask(myumask);
	if (fchmod(fd, 0644 & ~myumask) == -1)
		goto bad;

	(void) close(fd);
	fd = -1;

	if ((db = _ypdb_dbopen(file, O_RDWR, 0644)) == NULL)
		goto bad;

	return db;

 bad:
	save_errno = errno;
	if (fd != 1)
		(void) close(fd);
	(void) unlink(file);
	errno = save_errno;
	return NULL;
}

/*
 * _ypdb_dbopen --
 *	dbopen(3) path with the flags & mode.
 *	Try opening as a DB_BTREE first, then DB_HASH.
 */

static DBM *
_ypdb_dbopen(const char *path, int flags, mode_t mode)
{
	DBM *db;
	BTREEINFO info;

		/* try our btree format first */
	info.flags = 0;
	info.cachesize = 0;
	info.maxkeypage = 0;
	info.minkeypage = 0;
	info.psize = 0;
	info.compare = NULL;
	info.prefix = NULL;
	info.lorder = 0;
	db = (DBM *)dbopen(path, flags, mode, DB_BTREE, (void *)&info);
	if (db != NULL || errno != EFTYPE)
		return (db);

		/* fallback to standard hash (for sendmail's aliases.db) */
	db = (DBM *)dbopen(path, flags, mode, DB_HASH, NULL);
	return (db);
}

/*
 * ypdb_close --
 *	Close the db
 */

void
ypdb_close(DBM *db)
{
	(void)(db->close)(db);
}

/*
 * Returns:
 *	DATUM on success
 *	NULL on failure
 */

datum
ypdb_fetch(DBM *db, datum key)
{
	datum retkey;
	DBT nk, nd;
	int status;

	nk.data = key.dptr;
	nk.size = key.dsize;
	status = (db->get)(db, &nk, &nd, 0);
	if (status) {
		retkey.dptr = NULL;
		retkey.dsize = 0;
	} else {
		retkey.dptr = nd.data;
		retkey.dsize = nd.size;
	}
	return (retkey);
}

/*
 * Returns:
 *	DATUM on success
 *	NULL on failure
 */

datum
ypdb_firstkey(DBM *db)
{
	int status;
	datum retkey;
	DBT nk, nd;

	status = (db->seq)(db, &nk, &nd, R_FIRST);
	if (status) {
		retkey.dptr = NULL;
		retkey.dsize = 0;
	} else {
		retkey.dptr = nk.data;
		retkey.dsize = nk.size;
	}
	return (retkey);
}

/*
 * Returns:
 *	DATUM on success
 *	NULL on failure
 */

datum
ypdb_nextkey(DBM *db)
{
	int status;
	datum retkey;
	DBT nk, nd;

	status = (db->seq)(db, &nk, &nd, R_NEXT);
	if (status) {
		retkey.dptr = NULL;
		retkey.dsize = 0;
	} else {
		retkey.dptr = nk.data;
		retkey.dsize = nk.size;
	}
	return (retkey);
}

/*
 * Returns:
 *	DATUM on success
 *	NULL on failure
 */

datum
ypdb_setkey(DBM *db, datum key)
{
	int status;
	DBT nk, nd;

	nk.data = key.dptr;
	nk.size = key.dsize;
	status = (db->seq)(db, &nk, &nd, R_CURSOR);
	if (status) {
		key.dptr = NULL;
		key.dsize = 0;
	}
	return (key);
}

/*
 * Returns:
 *	 0 on success
 *	<0 failure
 */

int
ypdb_delete(DBM *db, datum key)
{
	int status;
	DBT nk;

	nk.data = key.dptr;
	nk.size = key.dsize;
	status = (db->del)(db, &nk, 0);
	if (status)
		return (-1);
	else
		return (0);
}

/*
 * Returns:
 *	 0 on success
 *	<0 failure
 *	 1 if YPDB_INSERT and entry exists
 */

int
ypdb_store(DBM *db, datum key, datum content, int flags)
{
	DBT nk, nd;

	if (key.dsize > YPMAXRECORD || content.dsize > YPMAXRECORD)
		return -1;
	nk.data = key.dptr;
	nk.size = key.dsize;
	nd.data = content.dptr;
	nd.size = content.dsize;
	return ((db->put)(db, &nk, &nd,
	    (flags == YPDB_INSERT) ? R_NOOVERWRITE : 0));
}