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