1 /*-
2 * SPDX-License-Identifier: BSD-2-Clause
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/types.h>
31 #include <sys/acct.h>
32
33 #include <ctype.h>
34 #include <err.h>
35 #include <errno.h>
36 #include <db.h>
37 #include <fcntl.h>
38 #include <stdio.h>
39 #include <stdlib.h>
40 #include <string.h>
41 #include <limits.h>
42
43 #include "extern.h"
44
45 /* Key used to store the version of the database data elements. */
46 static char VERSION_KEY[] = "\0VERSION";
47
48 /*
49 * Create the in-memory database, *mdb.
50 * If iflag is not set, fill-in mdb with the records of the disk-based
51 * database dbname.
52 * Upgrade old-version records by calling v1_to_v2.
53 * Return 0 if OK, -1 on error.
54 */
55 int
db_copy_in(DB ** mdb,const char * dbname,const char * uname,BTREEINFO * bti,int (* v1_to_v2)(DBT * key,DBT * data))56 db_copy_in(DB **mdb, const char *dbname, const char *uname, BTREEINFO *bti,
57 int (*v1_to_v2)(DBT *key, DBT *data))
58 {
59 DBT key, data;
60 DB *ddb;
61 int error, rv, version;
62
63 if ((*mdb = dbopen(NULL, O_RDWR, 0, DB_BTREE, bti)) == NULL)
64 return (-1);
65
66 if (iflag)
67 return (0);
68
69 if ((ddb = dbopen(dbname, O_RDONLY, 0, DB_BTREE, bti)) == NULL) {
70 if (errno == ENOENT)
71 return (0);
72 warn("retrieving %s summary", uname);
73 db_destroy(*mdb, uname);
74 return (-1);
75 }
76
77 error = 0;
78
79 /* Obtain/set version. */
80 version = 1;
81 key.data = (void*)&VERSION_KEY;
82 key.size = sizeof(VERSION_KEY);
83
84 rv = DB_GET(ddb, &key, &data, 0);
85 if (rv < 0) {
86 warn("get version key from %s stats", uname);
87 error = -1;
88 goto closeout;
89 } else if (rv == 0) { /* It's there; verify version. */
90 if (data.size != sizeof(version)) {
91 warnx("invalid version size %zd in %s",
92 data.size, uname);
93 error = -1;
94 goto closeout;
95 }
96 memcpy(&version, data.data, data.size);
97 if (version != 2) {
98 warnx("unsupported version %d in %s",
99 version, uname);
100 error = -1;
101 goto closeout;
102 }
103 }
104
105 for (rv = DB_SEQ(ddb, &key, &data, R_FIRST); rv == 0;
106 rv = DB_SEQ(ddb, &key, &data, R_NEXT)) {
107
108 /* See if this is a version record. */
109 if (key.size == sizeof(VERSION_KEY) &&
110 memcmp(key.data, VERSION_KEY, sizeof(VERSION_KEY)) == 0)
111 continue;
112
113 /* Convert record from v1, if needed. */
114 if (version == 1 && v1_to_v2(&key, &data) < 0) {
115 warn("converting %s stats", uname);
116 error = -1;
117 goto closeout;
118 }
119
120 /* Copy record to the in-memory database. */
121 if ((rv = DB_PUT(*mdb, &key, &data, 0)) < 0) {
122 warn("initializing %s stats", uname);
123 error = -1;
124 goto closeout;
125 }
126 }
127 if (rv < 0) {
128 warn("retrieving %s summary", uname);
129 error = -1;
130 }
131
132 closeout:
133 if (DB_CLOSE(ddb) < 0) {
134 warn("closing %s summary", uname);
135 error = -1;
136 }
137
138 if (error)
139 db_destroy(*mdb, uname);
140 return (error);
141 }
142
143 /*
144 * Save the in-memory database mdb to the disk database dbname.
145 * Return 0 if OK, -1 on error.
146 */
147 int
db_copy_out(DB * mdb,const char * dbname,const char * uname,BTREEINFO * bti)148 db_copy_out(DB *mdb, const char *dbname, const char *uname, BTREEINFO *bti)
149 {
150 DB *ddb;
151 DBT key, data;
152 int error, rv, version;
153
154 if ((ddb = dbopen(dbname, O_RDWR|O_CREAT|O_TRUNC, 0644,
155 DB_BTREE, bti)) == NULL) {
156 warn("creating %s summary", uname);
157 return (-1);
158 }
159
160 error = 0;
161
162 for (rv = DB_SEQ(mdb, &key, &data, R_FIRST);
163 rv == 0; rv = DB_SEQ(mdb, &key, &data, R_NEXT)) {
164 if ((rv = DB_PUT(ddb, &key, &data, 0)) < 0) {
165 warn("saving %s summary", uname);
166 error = -1;
167 goto out;
168 }
169 }
170 if (rv < 0) {
171 warn("retrieving %s stats", uname);
172 error = -1;
173 }
174
175 out:
176 /* Add a version record. */
177 key.data = (void*)&VERSION_KEY;
178 key.size = sizeof(VERSION_KEY);
179 version = 2;
180 data.data = &version;
181 data.size = sizeof(version);
182 if ((rv = DB_PUT(ddb, &key, &data, 0)) < 0) {
183 warn("add version record to %s stats", uname);
184 error = -1;
185 } else if (rv == 1) {
186 warnx("duplicate version record in %s stats", uname);
187 error = -1;
188 }
189
190 if (DB_SYNC(ddb, 0) < 0) {
191 warn("syncing %s summary", uname);
192 error = -1;
193 }
194 if (DB_CLOSE(ddb) < 0) {
195 warn("closing %s summary", uname);
196 error = -1;
197 }
198 return error;
199 }
200
201 void
db_destroy(DB * db,const char * uname)202 db_destroy(DB *db, const char *uname)
203 {
204 if (DB_CLOSE(db) < 0)
205 warn("destroying %s stats", uname);
206 }
207