/* $NetBSD: usrdb.c,v 1.14 2010/08/30 02:49:17 dholland Exp $ */

/*
* Copyright (c) 1994 Christopher G. Demetriou
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
*    notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
*    notice, this list of conditions and the following disclaimer in the
*    documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
*    must display the following acknowledgement:
*          This product includes software developed for the
*          NetBSD Project.  See http://www.NetBSD.org/ for
*          information about NetBSD.
* 4. The name of the author may not be used to endorse or promote products
*    derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
* <<Id: LICENSE,v 1.2 2000/06/14 15:57:33 cgd Exp>>
*/

#include <sys/cdefs.h>
#ifndef lint
__RCSID("$NetBSD: usrdb.c,v 1.14 2010/08/30 02:49:17 dholland Exp $");
#endif

#include <sys/types.h>
#include <sys/acct.h>
#include <err.h>
#include <errno.h>
#include <fcntl.h>
#include <pwd.h>
#include <stdio.h>
#include <string.h>
#include "extern.h"
#include "pathnames.h"

static int uid_compare(const DBT *, const DBT *);

static DB       *usracct_db;

int
usracct_init(void)
{
       DB *saved_usracct_db;
       BTREEINFO bti;
       int error;
       int ndups = 0;

       memset(&bti, 0, sizeof(bti));
       bti.compare = uid_compare;

       usracct_db = dbopen(NULL, O_RDWR|O_CREAT|O_TRUNC, 0644, DB_BTREE, &bti);
       if (usracct_db == NULL)
               return (-1);

       error = 0;
       if (!iflag) {
               DBT key, data;
               int serr, nerr;

               saved_usracct_db = dbopen(_PATH_USRACCT, O_RDONLY, 0, DB_BTREE,
                   &bti);
               if (saved_usracct_db == NULL) {
                       error = (errno == ENOENT) ? 0 : -1;
                       if (error)
                               warn("retrieving user accounting summary");
                       goto out;
               }

               serr = DB_SEQ(saved_usracct_db, &key, &data, R_FIRST);
               if (serr < 0) {
                       warn("retrieving user accounting summary");
                       error = -1;
                       goto closeout;
               }
               while (serr == 0) {
                       nerr = DB_PUT(usracct_db, &key, &data, R_NOOVERWRITE);
                       if (nerr < 0) {
                               warn("initializing user accounting stats");
                               error = -1;
                               break;
                       }
                       if (nerr == 1) {
                               warnx("duplicate key in `%s': %s",
                                   _PATH_USRACCT, fmt(&key));
                               if (ndups++ == 5) {
                                       warnx("too many duplicate keys;"
                                           " `%s' possibly corrupted.",
                                           _PATH_USRACCT);
                                       error = -1;
                                       break;
                               }
                       }

                       serr = DB_SEQ(saved_usracct_db, &key, &data, R_NEXT);
                       if (serr < 0) {
                               warn("retrieving user accounting summary");
                               error = -1;
                               break;
                       }
               }

closeout:
               if (DB_CLOSE(saved_usracct_db) < 0) {
                       warn("closing user accounting summary");
                       error = -1;
               }
       }

out:
       if (error != 0)
               usracct_destroy();
       return (error);
}

void
usracct_destroy(void)
{
       if (DB_CLOSE(usracct_db) < 0)
               warn("destroying user accounting stats");
}

int
usracct_add(const struct cmdinfo *ci)
{
       DBT key, data;
       struct userinfo newui;
       uid_t uid;
       int rv;

       uid = ci->ci_uid;
       key.data = &uid;
       key.size = sizeof(uid);

       rv = DB_GET(usracct_db, &key, &data, 0);
       if (rv < 0) {
               warn("get key %d from user accounting stats", uid);
               return (-1);
       } else if (rv == 0) {   /* it's there; copy whole thing */
               /* add the old data to the new data */
               memcpy(&newui, data.data, data.size);
               if (newui.ui_uid != uid) {
                       warnx("key %d != expected record number %d",
                           newui.ui_uid, uid);
                       warnx("inconsistent user accounting stats");
                       return (-1);
               }
       } else {                /* it's not there; zero it and copy the key */
               memset(&newui, 0, sizeof(newui));
               newui.ui_uid = ci->ci_uid;
       }

       newui.ui_calls += ci->ci_calls;
       newui.ui_utime += ci->ci_utime;
       newui.ui_stime += ci->ci_stime;
       newui.ui_mem += ci->ci_mem;
       newui.ui_io += ci->ci_io;

       data.data = &newui;
       data.size = sizeof(newui);
       rv = DB_PUT(usracct_db, &key, &data, 0);
       if (rv < 0) {
               warn("add key %d to user accounting stats", uid);
               return (-1);
       } else if (rv != 0) {
               warnx("DB_PUT returned 1");
               return (-1);
       }

       return (0);
}

int
usracct_update(void)
{
       DB *saved_usracct_db;
       DBT key, data;
       BTREEINFO bti;
       int error, serr, nerr;

       memset(&bti, 0, sizeof(bti));
       bti.compare = uid_compare;

       saved_usracct_db = dbopen(_PATH_USRACCT, O_RDWR|O_CREAT|O_TRUNC, 0644,
           DB_BTREE, &bti);
       if (saved_usracct_db == NULL) {
               warn("creating user accounting summary");
               return (-1);
       }

       error = 0;

       serr = DB_SEQ(usracct_db, &key, &data, R_FIRST);
       if (serr < 0) {
               warn("retrieving user accounting stats");
               error = -1;
       }
       while (serr == 0) {
               nerr = DB_PUT(saved_usracct_db, &key, &data, 0);
               if (nerr < 0) {
                       warn("saving user accounting summary");
                       error = -1;
                       break;
               }

               serr = DB_SEQ(usracct_db, &key, &data, R_NEXT);
               if (serr < 0) {
                       warn("retrieving user accounting stats");
                       error = -1;
                       break;
               }
       }

       if (DB_SYNC(saved_usracct_db, 0) < 0) {
               warn("syncing process accounting summary");
               error = -1;
       }
       if (DB_CLOSE(saved_usracct_db) < 0) {
               warn("closing process accounting summary");
               error = -1;
       }
       return error;
}

void
usracct_print(void)
{
       DBT key, data;
       struct userinfo uistore, *ui = &uistore;
       double t;
       int rv;

       rv = DB_SEQ(usracct_db, &key, &data, R_FIRST);
       if (rv < 0)
               warn("retrieving user accounting stats");

       while (rv == 0) {
               memcpy(ui, data.data, sizeof(struct userinfo));

               printf("%-8s %9llu ",
                   user_from_uid(ui->ui_uid, 0),
                   (unsigned long long)ui->ui_calls);

               t = (double) (ui->ui_utime + ui->ui_stime) /
                   (double) AHZ;
               if (t < 0.0001)         /* kill divide by zero */
                       t = 0.0001;

               printf("%12.2f%s ", t / 60.0, "cpu");

               /* ui->ui_calls is always != 0 */
               if (dflag)
                       printf("%12llu%s",
                           (unsigned long long)(ui->ui_io / ui->ui_calls),
                           "avio");
               else
                       printf("%12llu%s",
                           (unsigned long long)ui->ui_io, "tio");

               /* t is always >= 0.0001; see above */
               if (kflag)
                       printf("%12llu%s", (unsigned long long)(ui->ui_mem / t),
                           "k");
               else
                       printf("%12llu%s", (unsigned long long)ui->ui_mem,
                           "k*sec");

               printf("\n");

               rv = DB_SEQ(usracct_db, &key, &data, R_NEXT);
               if (rv < 0)
                       warn("retrieving user accounting stats");
       }
}

static int
uid_compare(const DBT *k1, const DBT *k2)
{
       uid_t d1, d2;

       memcpy(&d1, k1->data, sizeof(d1));
       memcpy(&d2, k2->data, sizeof(d2));

       if (d1 < d2)
               return -1;
       else if (d1 == d2)
               return 0;
       else
               return 1;
}

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