system_cmds/sa.tproj/db.c

   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: src/usr.sbin/sa/db.c,v 1.3 2008/02/21 07:12:56 grog Exp $");
  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 #ifndef __APPLE__
 178         /* Add a version record. */
 179         key.data = &VERSION_KEY;
 180         key.size = sizeof(VERSION_KEY);
 181         version = 2;
 182         data.data = &version;
 183         data.size = sizeof(version);
 184         if ((rv = DB_PUT(ddb, &key, &data, 0)) < 0) {
 185                 warn("add version record to %s stats", uname);
 186                 error = -1;
 187         } else if (rv == 1) {
 188                 warnx("duplicate version record in %s stats", uname);
 189                 error = -1;
 190         }
 191 #else
 192         version = 1; // avoid unused warning
 193 #endif
 194
 195         if (DB_SYNC(ddb, 0) < 0) {
 196                 warn("syncing %s summary", uname);
 197                 error = -1;
 198         }
 199         if (DB_CLOSE(ddb) < 0) {
 200                 warn("closing %s summary", uname);
 201                 error = -1;
 202         }
 203         return error;
 204 }
 205
 206 void
 207 db_destroy(DB *db, const char *uname)
 208 {
 209         if (DB_CLOSE(db) < 0)
 210                 warn("destroying %s stats", uname);
 211 }