sw/standalone/mainthot.php

#!/usr/bin/php -q
<?php
//$Header: /home/dashley/cvsrep/e3ft_gpl01/e3ft_gpl01/webprojs/fboprime/sw/standalone/mainthot.php,v 1.5 2006/07/02 20:08:46 dashley Exp $
//--------------------------------------------------------------------------------
//mainthot.php--Periodic Maintenance Script
//Copyright (C) 2006  David T. Ashley
//
//This program is free software; you can redistribute it and/or
//modify it under the terms of the GNU General Public License
//as published by the Free Software Foundation; either version 2
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//
//This program is distributed in the hope that it will be useful,
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//You should have received a copy of the GNU General Public License
//along with this program; if not, write to the Free Software
//Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
//--------------------------------------------------------------------------------
//-------------------------------------------------------------------------------------------------
//Copyright 2006 David T. Ashley
//-------------------------------------------------------------------------------------------------
//This source code and any program in which it is compiled/used is provided under the GNU GENERAL
//PUBLIC LICENSE, Version 3, full license text below.
//-------------------------------------------------------------------------------------------------
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//  If the Program specifies that a proxy can decide which future
//versions of the GNU General Public License can be used, that proxy's
//public statement of acceptance of a version permanently authorizes you
//to choose that version for the Program.
//
//  Later license versions may give you additional or different
//permissions.  However, no additional obligations are imposed on any
//author or copyright holder as a result of your choosing to follow a
//later version.
//
//  15. Disclaimer of Warranty.
//
//  THERE IS NO WARRANTY FOR THE PROGRAM, TO THE EXTENT PERMITTED BY
//APPLICABLE LAW.  EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT
//HOLDERS AND/OR OTHER PARTIES PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY
//OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO,
//THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
//PURPOSE.  THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE PROGRAM
//IS WITH YOU.  SHOULD THE PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF
//ALL NECESSARY SERVICING, REPAIR OR CORRECTION.
//
//  16. Limitation of Liability.
//
//  IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
//WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR CONVEYS
//THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY
//GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE
//USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF
//DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD
//PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS),
//EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF
//SUCH DAMAGES.
//
//  17. Interpretation of Sections 15 and 16.
//
//  If the disclaimer of warranty and limitation of liability provided
//above cannot be given local legal effect according to their terms,
//reviewing courts shall apply local law that most closely approximates
//an absolute waiver of all civil liability in connection with the
//Program, unless a warranty or assumption of liability accompanies a
//copy of the Program in return for a fee.
//
//                     END OF TERMS AND CONDITIONS
//
//            How to Apply These Terms to Your New Programs
//
//  If you develop a new program, and you want it to be of the greatest
//possible use to the public, the best way to achieve this is to make it
//free software which everyone can redistribute and change under these terms.
//
//  To do so, attach the following notices to the program.  It is safest
//to attach them to the start of each source file to most effectively
//state the exclusion of warranty; and each file should have at least
//the "copyright" line and a pointer to where the full notice is found.
//
//    <one line to give the program's name and a brief idea of what it does.>
//    Copyright (C) <year>  <name of author>
//
//    This program is free software: you can redistribute it and/or modify
//    it under the terms of the GNU General Public License as published by
//    the Free Software Foundation, either version 3 of the License, or
//    (at your option) any later version.
//
//    This program is distributed in the hope that it will be useful,
//    but WITHOUT ANY WARRANTY; without even the implied warranty of
//    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
//    GNU General Public License for more details.
//
//    You should have received a copy of the GNU General Public License
//    along with this program.  If not, see <http://www.gnu.org/licenses/>.
//
//Also add information on how to contact you by electronic and paper mail.
//
//  If the program does terminal interaction, make it output a short
//notice like this when it starts in an interactive mode:
//
//    <program>  Copyright (C) <year>  <name of author>
//    This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
//    This is free software, and you are welcome to redistribute it
//    under certain conditions; type `show c' for details.
//
//The hypothetical commands `show w' and `show c' should show the appropriate
//parts of the General Public License.  Of course, your program's commands
//might be different; for a GUI interface, you would use an "about box".
//
//  You should also get your employer (if you work as a programmer) or school,
//if any, to sign a "copyright disclaimer" for the program, if necessary.
//For more information on this, and how to apply and follow the GNU GPL, see
//<http://www.gnu.org/licenses/>.
//
//  The GNU General Public License does not permit incorporating your program
//into proprietary programs.  If your program is a subroutine library, you
//may consider it more useful to permit linking proprietary applications with
//the library.  If this is what you want to do, use the GNU Lesser General
//Public License instead of this License.  But first, please read
//<http://www.gnu.org/philosophy/why-not-lgpl.html>.
//-------------------------------------------------------------------------------------------------
//Set the include file path.  This is necessary to get to the configuration
//information, including how to try to connect to the database.
set_include_path("/var/www/php_library/fboprime");
//
require_once("config.inc");
require_once("global.inc");
require_once("log.inc");
require_once("sess.inc");
require_once("utimex.inc");
//
//--------------------------------------------------------------------------------
//Writes a horizontal line.
//
function hline()
   {
   for ($i=0; $i<80; $i++)
      {
      echo "-";
      }
   echo "\n";
   }
//
//--------------------------------------------------------------------------------
//Errors out.
//
function error_out()
   {
   echo "FATAL ERROR\n";
   exit(1);
   }
//
//--------------------------------------------------------------------------------
//Returns a version control string.
//
function vc_info()
   {
   return("\$Header: /home/dashley/cvsrep/e3ft_gpl01/e3ft_gpl01/webprojs/fboprime/sw/standalone/mainthot.php,v 1.5 2006/07/02 20:08:46 dashley Exp $");
   }
//
//--------------------------------------------------------------------------------
//Trim the number of log entries to the quantity specified in the config file.
//
function trim_log_file()
   {
   global $GLOBAL_dbhandle;
   global $GLOBAL_stime_string; 
   global $GLOBAL_client_ip; 

   LOG_log(LOG_ET_MAINT_PERIODIC, 
           $GLOBAL_stime_string, 
           $GLOBAL_client_ip, 
           "", 
           "", 
           "", 
           "", 
           "", 
           "", 
           "Trim of log file in \$RCSfile: mainthot.php,v $ begins.");

   //Obtain an integer indicating the number of entries in the log file.  If this
   //integer is 0, don't proceed.
   $loge_count = FALSE;                      //Default value in case no
                                             //count available.

   //Form the query string.
   $query_string = "SELECT COUNT(*) FROM loge";

   //Execute the query.
   $query_result = mysql_query($query_string, $GLOBAL_dbhandle);

   if ($query_result === FALSE)
      {
      //Unknown query failure.  Let the value of loge_count stand at FALSE.
      }
   else
      {
      //Get the integer result.
      $row = mysql_fetch_array($query_result, MYSQL_NUM);

      $loge_count = $row[0];

      if (is_numeric($loge_count))
        $loge_count = (int) $loge_count;

      //print_r ($loge_count);

      //Free the result.
      mysql_free_result($query_result);
      }

   //If something didn't go right, do nothing.
   if ((! is_int($loge_count)) || ($loge_count <= 0))
      {
      LOG_log(LOG_ET_MAINT_PERIODIC, 
              $GLOBAL_stime_string, 
              $GLOBAL_client_ip, 
              "", 
              "", 
              "", 
              "", 
              "", 
              "", 
              "Unexpected count of records from \"loge\" table in \$RCSfile: mainthot.php,v $.");
      }
   else
      {
      //We have an integer > 0.  Proceed.
      LOG_log(LOG_ET_MAINT_PERIODIC, 
              $GLOBAL_stime_string, 
              $GLOBAL_client_ip, 
              "", 
              "", 
              "", 
              "", 
              "", 
              "", 
              "\"loge\" table contains " . sprintf("%d", $loge_count) . " records in \$RCSfile: mainthot.php,v $.");


      //We now want to obtain the index of the highest-numbered record.
      $loge_max = FALSE;                      //Default value in case no
                                              //count available.

      //Form the query string.
      $query_string = "SELECT MAX(idx) FROM loge";

      //Execute the query.
      $query_result = mysql_query($query_string, $GLOBAL_dbhandle);

      if ($query_result === FALSE)
         {
         //Unknown query failure.  Let the value of loge_max stand.
         }
      else
         {
         //Get the integer result.
         $row = mysql_fetch_array($query_result, MYSQL_NUM);

         $loge_max = $row[0];

         if (is_numeric($loge_max))
           $loge_max = (int) $loge_max;

         //print_r ($loge_max);

         //Free the result.
         mysql_free_result($query_result);
         }

      //If something didn't go right, do nothing.
      if ((! is_int($loge_max)) || ($loge_max <= 0))
         {
         LOG_log(LOG_ET_MAINT_PERIODIC, 
                 $GLOBAL_stime_string, 
                 $GLOBAL_client_ip, 
                 "", 
                 "", 
                 "", 
                 "", 
                 "", 
                 "", 
                 "Unexpected maximum \"idx\" from \"loge\" table in \$RCSfile: mainthot.php,v $.");
         }
      else
         {
         //We have an integer > 0.  Proceed.
         LOG_log(LOG_ET_MAINT_PERIODIC, 
                 $GLOBAL_stime_string, 
                 $GLOBAL_client_ip, 
                 "", 
                 "", 
                 "", 
                 "", 
                 "", 
                 "", 
                 "\"loge\" table contains highest \"idx\" " . sprintf("%d", $loge_max) . " in \$RCSfile: mainthot.php,v $.");

         //Determine the maximum index that will be retained in the loge table.
         $max_index = $loge_max - CONFIG_LOG_MAX_ENTRIES + 1;

         //If the value is < 2, then there is nothing to delete.   Presumably, the log hasn't grown big enough yet.
         if ($max_index < 2)
            {
            LOG_log(LOG_ET_MAINT_PERIODIC, 
                    $GLOBAL_stime_string, 
                    $GLOBAL_client_ip, 
                    "", 
                    "", 
                    "", 
                    "", 
                    "", 
                    "", 
                    "Not enough records in \"loge\" to trim in \$RCSfile: mainthot.php,v $.");
            }
         else
            {
            //Trim the records.
            mysql_query("DELETE FROM loge WHERE idx<" . sprintf("%d", $max_index), $GLOBAL_dbhandle);
            LOG_log(LOG_ET_MAINT_PERIODIC, 
                    $GLOBAL_stime_string, 
                    $GLOBAL_client_ip, 
                    "", 
                    "", 
                    "", 
                    "", 
                    "", 
                    "", 
                    "Records from \"loge\" with \"idx\" < " . sprintf("%d", $max_index) . " deleted in \$RCSfile: mainthot.php,v $.");
            }
         }
      }

   LOG_log(LOG_ET_MAINT_PERIODIC, 
           $GLOBAL_stime_string, 
           $GLOBAL_client_ip, 
           "", 
           "", 
           "", 
           "", 
           "", 
           "", 
           "Trim of log file in \$RCSfile: mainthot.php,v $ ends.");
   }
//
//
//--------------------------------------------------------------------------------
//
function age_out_old_sessions()
   {
   global $GLOBAL_dbhandle;
   global $GLOBAL_stime_string; 
   global $GLOBAL_client_ip; 
   global $GLOBAL_utime_ut;

   LOG_log(LOG_ET_MAINT_PERIODIC, 
           $GLOBAL_stime_string, 
           $GLOBAL_client_ip, 
           "", 
           "", 
           "", 
           "", 
           "", 
           "", 
           "Reap of expired sessions in \$RCSfile: mainthot.php,v $ begins.");

   //Calculate the UTIME representing the Unix time at or
   //before which we should kill sessions.  We have to use bcmath to do this
   //safely.
   $utime_cutoff = UTIME_time_offset_coarse($GLOBAL_utime_ut, -SESS_REAP_INACTIVE_TIME);

   //Log the cutoff time calculated.  This may be useful to diagnose any problems.
   LOG_log(LOG_ET_MAINT_PERIODIC, 
           $GLOBAL_stime_string, 
           $GLOBAL_client_ip, 
           "", 
           "", 
           "", 
           "", 
           "", 
           "", 
           "UTIME session reap cutoff calculated in \$RCSfile: mainthot.php,v $ is \"" . $utime_cutoff . "\".");

   //Form the query string.
   $query_string = "DELETE FROM sess WHERE revaltime < \"" . $utime_cutoff . "\"";

   //Execute the query.
   $query_result = mysql_query($query_string, $GLOBAL_dbhandle);

   if ($query_result === FALSE)
      {
      //Unknown query failure.  Log this unexpected event.
      LOG_log(LOG_ET_MAINT_PERIODIC, 
              $GLOBAL_stime_string, 
              $GLOBAL_client_ip, 
              "", 
              "", 
              "", 
              "", 
              "", 
              "", 
              "Unexpected query failure in \$RCSfile: mainthot.php,v $ while reaping expired sessions.");
      }
   else
      {
      $n = mysql_affected_rows($GLOBAL_dbhandle);

      if ($n < 0)
         {
         //A value of -1 is an error flag, and of course there is also something wrong with smaller values.
         //Announce such an error.
         LOG_log(LOG_ET_MAINT_PERIODIC, 
                 $GLOBAL_stime_string, 
                 $GLOBAL_client_ip, 
                 "", 
                 "", 
                 "", 
                 "", 
                 "", 
                 "", 
                 "Unexpected failure of mysql_affected_rows() in \$RCSfile: mainthot.php,v $ while reaping expired sessions.");
         }
      else
         {
         //Successful query.  Log number of records reaped.
         //
         LOG_log(LOG_ET_MAINT_PERIODIC, 
                 $GLOBAL_stime_string, 
                 $GLOBAL_client_ip, 
                 "", 
                 "", 
                 "", 
                 "", 
                 "", 
                 "", 
                 (string)$n . " session record(s) reaped in \$RCSfile: mainthot.php,v $.");
         }
      }

   //Log the end of this activity.
   LOG_log(LOG_ET_MAINT_PERIODIC, 
           $GLOBAL_stime_string, 
           $GLOBAL_client_ip, 
           "", 
           "", 
           "", 
           "", 
           "", 
           "", 
           "Reap of expired sessions in \$RCSfile: mainthot.php,v $ ends.");
   }
//
//--------------------------------------------------------------------------------
//Runs the maintenance itself.
//
function maintenance_hot()
   {
   //Trim the number of log entries to the value specified in the configuration file.
   trim_log_file();

   //Age out sessions that are too old.  These would in general correspond to 
   //users who logged in then closed a browser without logging out.
   age_out_old_sessions();
   }
//
//--------------------------------------------------------------------------------
//--------------------------------------------------------------------------------
//--------------------------------------------------------------------------------
//------  M A I N    S C R I P T  ------------------------------------------------
//--------------------------------------------------------------------------------
//--------------------------------------------------------------------------------
//--------------------------------------------------------------------------------
//Initialize the global variables.
GLOBAL_init();
//
//Try to connect to the database daemon.  If not successful, log it in the system
//logs and exit.  If successful, log that, too.
//
$GLOBAL_dbhandle = mysql_connect(CONFIG_MYSQL_SERVER, CONFIG_MYSQL_USERNAME, CONFIG_MYSQL_PASSWORD);
if ($GLOBAL_dbhandle === FALSE)
   {
   LOG_syslog("Unable to connect and/or authenticate to MySQL database in \$RCSfile: mainthot.php,v $.");
   exit(0);
   }

$result = mysql_select_db(CONFIG_MYSQL_DATABASE, $GLOBAL_dbhandle);
if ($result === FALSE)
   {
   LOG_syslog("Unable to select database " . CONFIG_MYSQL_DATABASE . " in \$RCSfile: mainthot.php,v $.");
   exit(0);
   }

//We have connected to the database.  Make a log entry to that effect.
LOG_log(LOG_ET_MAINT_PERIODIC, 
        $GLOBAL_stime_string, 
        $GLOBAL_client_ip, 
        "", 
        "", 
        "", 
        "", 
        "", 
        "", 
        "Execution of \$RCSfile: mainthot.php,v $ begins with uid=" . posix_geteuid() . " and gid=" . posix_getegid() . ".");

//Log the version control string.
LOG_log(LOG_ET_MAINT_PERIODIC, 
        $GLOBAL_stime_string, 
        $GLOBAL_client_ip, 
        "", 
        "", 
        "", 
        "", 
        "", 
        "", 
        vc_info());

//Run the maintenance proper.
maintenance_hot();

//The automatic maintenance is finished.  Make a log entry to that effect.
LOG_log(LOG_ET_MAINT_PERIODIC, 
        $GLOBAL_stime_string, 
        $GLOBAL_client_ip, 
        "", 
        "", 
        "", 
        "", 
        "", 
        "", 
        "Execution of \$RCSfile: mainthot.php,v $ ends.");

$result = mysql_close($GLOBAL_dbhandle);
if ($result === FALSE)
   {
   echo "ERROR:  Unable to close MySQL connection.\n";
   exit(0);
   }
   
//If we're here, success.  Per the standard Unix way of thinking
//say nothing.  Silence means OK.
exit(0);
//
//--------------------------------------------------------------------------------
//End of $RCSfile: mainthot.php,v $.
//--------------------------------------------------------------------------------
?>