1/*-
2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
3 *
4 * Copyright (c) 2007 Diomidis Spinellis
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 *    notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 *    notice, this list of conditions and the following disclaimer in the
14 *    documentation and/or other materials provided with the distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * SUCH DAMAGE.
27 *
28 */
29
30#include <sys/cdefs.h>
31__FBSDID("$FreeBSD$");
32
33#include <sys/types.h>
34#include <sys/acct.h>
35
36#include <ctype.h>
37#include <err.h>
38#include <errno.h>
39#include <db.h>
40#include <fcntl.h>
41#include <stdio.h>
42#include <stdlib.h>
43#include <string.h>
44#include <limits.h>
45
46#include "extern.h"
47
48/* Key used to store the version of the database data elements. */
49static char VERSION_KEY[] = "\0VERSION";
50
51/*
52 * Create the in-memory database, *mdb.
53 * If iflag is not set, fill-in mdb with the records of the disk-based
54 * database dbname.
55 * Upgrade old-version records by calling v1_to_v2.
56 * Return 0 if OK, -1 on error.
57 */
58int
59db_copy_in(DB **mdb, const char *dbname, const char *uname, BTREEINFO *bti,
60    int (*v1_to_v2)(DBT *key, DBT *data))
61{
62	DBT key, data;
63	DB *ddb;
64	int error, rv, version;
65
66	if ((*mdb = dbopen(NULL, O_RDWR, 0, DB_BTREE, bti)) == NULL)
67		return (-1);
68
69	if (iflag)
70		return (0);
71
72	if ((ddb = dbopen(dbname, O_RDONLY, 0, DB_BTREE, bti)) == NULL) {
73		if (errno == ENOENT)
74			return (0);
75		warn("retrieving %s summary", uname);
76		db_destroy(*mdb, uname);
77		return (-1);
78	}
79
80	error = 0;
81
82	/* Obtain/set version. */
83	version = 1;
84	key.data = (void*)&VERSION_KEY;
85	key.size = sizeof(VERSION_KEY);
86
87	rv = DB_GET(ddb, &key, &data, 0);
88	if (rv < 0) {
89		warn("get version key from %s stats", uname);
90		error = -1;
91		goto closeout;
92	} else if (rv == 0) {	/* It's there; verify version. */
93		if (data.size != sizeof(version)) {
94			warnx("invalid version size %zd in %s",
95			    data.size, uname);
96			error = -1;
97			goto closeout;
98		}
99		memcpy(&version, data.data, data.size);
100		if (version != 2) {
101			warnx("unsupported version %d in %s",
102			    version, uname);
103			error = -1;
104			goto closeout;
105		}
106	}
107
108	for (rv = DB_SEQ(ddb, &key, &data, R_FIRST); rv == 0;
109	    rv = DB_SEQ(ddb, &key, &data, R_NEXT)) {
110
111		/* See if this is a version record. */
112		if (key.size == sizeof(VERSION_KEY) &&
113		    memcmp(key.data, VERSION_KEY, sizeof(VERSION_KEY)) == 0)
114			continue;
115
116		/* Convert record from v1, if needed. */
117		if (version == 1 && v1_to_v2(&key, &data) < 0) {
118			warn("converting %s stats", uname);
119			error = -1;
120			goto closeout;
121		}
122
123		/* Copy record to the in-memory database. */
124		if ((rv = DB_PUT(*mdb, &key, &data, 0)) < 0) {
125			warn("initializing %s stats", uname);
126			error = -1;
127			goto closeout;
128		}
129	}
130	if (rv < 0) {
131		warn("retrieving %s summary", uname);
132		error = -1;
133	}
134
135closeout:
136	if (DB_CLOSE(ddb) < 0) {
137		warn("closing %s summary", uname);
138		error = -1;
139	}
140
141	if (error)
142		db_destroy(*mdb, uname);
143	return (error);
144}
145
146/*
147 * Save the in-memory database mdb to the disk database dbname.
148 * Return 0 if OK, -1 on error.
149 */
150int
151db_copy_out(DB *mdb, const char *dbname, const char *uname, BTREEINFO *bti)
152{
153	DB *ddb;
154	DBT key, data;
155	int error, rv, version;
156
157	if ((ddb = dbopen(dbname, O_RDWR|O_CREAT|O_TRUNC, 0644,
158	    DB_BTREE, bti)) == NULL) {
159		warn("creating %s summary", uname);
160		return (-1);
161	}
162
163	error = 0;
164
165	for (rv = DB_SEQ(mdb, &key, &data, R_FIRST);
166	    rv == 0; rv = DB_SEQ(mdb, &key, &data, R_NEXT)) {
167		if ((rv = DB_PUT(ddb, &key, &data, 0)) < 0) {
168			warn("saving %s summary", uname);
169			error = -1;
170			goto out;
171		}
172	}
173	if (rv < 0) {
174		warn("retrieving %s stats", uname);
175		error = -1;
176	}
177
178out:
179	/* Add a version record. */
180	key.data = (void*)&VERSION_KEY;
181	key.size = sizeof(VERSION_KEY);
182	version = 2;
183	data.data = &version;
184	data.size = sizeof(version);
185	if ((rv = DB_PUT(ddb, &key, &data, 0)) < 0) {
186		warn("add version record to %s stats", uname);
187		error = -1;
188	} else if (rv == 1) {
189		warnx("duplicate version record in %s stats", uname);
190		error = -1;
191	}
192
193	if (DB_SYNC(ddb, 0) < 0) {
194		warn("syncing %s summary", uname);
195		error = -1;
196	}
197	if (DB_CLOSE(ddb) < 0) {
198		warn("closing %s summary", uname);
199		error = -1;
200	}
201	return error;
202}
203
204void
205db_destroy(DB *db, const char *uname)
206{
207	if (DB_CLOSE(db) < 0)
208		warn("destroying %s stats", uname);
209}
210