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/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. */ 49 static 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 */ 58 int 59 db_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 } 134 135 closeout: 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 */ 150 int 151 db_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 } 177 178 out: 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 } 203 204 void 205 db_destroy(DB *db, const char *uname) 206 { 207 if (DB_CLOSE(db) < 0) 208 warn("destroying %s stats", uname); 209 } 210