2001-11-12 21:42:17 +00:00
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<META http-equiv="Content-Style-Type" content="text/css">
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<META name="author" lang="en" "content=Michiel Broek">
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<META name="copyright" lang="en" content="Copyright Michiel Broek">
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<META name="description" lang="en" content="MBSE BBS Manual">
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<META name="keywords" lang="en" content="MBSE BBS, MBSE, BBS, manual, fido, fidonet, gateway, tosser, mail, tic, mailer">
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<TITLE>MBSE BBS Programs - mbtask - MBSE BBS Taskmanager.</TITLE>
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<LINK rel=stylesheet HREF="../manual.css">
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<BLOCKQUOTE>
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<h5>Last update 12-Nov-2001</h5>
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<P> <P>
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<H1>mbtask - MBSE BBS Taskmanager</H1>
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<P>
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<H3>Sysopsis.</H3>
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<P>
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<code><strong>mbtask</strong></code>
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<P> <P>
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<H3>Description.</H3>
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<P>
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<strong>mbtask</strong> is the taskmanager for the whole MBSE BBS system.
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This deamon keeps track of all client actions,
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does the logging for the clients, does database locking, authorizes clients,
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set/resets users "do not disturb flags", sends and receives chat messages,
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keeps track of Zone Mail Hour and the BBS open/close status. Communication
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between <strong>mbsed</strong> and the client programs is done via Unix
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Datagram sockets. The protocol used to communicate between <strong>mbtask</strong>
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and the clients is explained later.
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This daemon also watches the semafore directory for some special files.
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It also starts programs when they are needed.
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The very first time <b>mbtask</b> is started it creates a default config.data and task.data,
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the main configuration and task configuration files
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<b>mbtask</b> should be started at system boot so the bbs system will start working.
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The init script that is installed on your system will do that.
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This program is introduced with MBSE BBS v0.33.16
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and replaces the run_inout and mailer scripts that were called by cron every minute.
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<P>
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After startup and initalization <b>mbtask</b> runs internally once per second forever.
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If there is nothing to do then this time will slowly increase upto 5 seconds. This time will be reset
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to one second as soon as there is work to be done. The actual work is to check a number of external and
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internal semafore's and act on these.
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But before any program is started a number of things are checked:
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<OL>
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<LI>Check the system's load average. If it is too busy the processing of background
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tasks is suspended until your system load drops.
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The default setup is set at 1.50 but you can change that with mbsetup. Experience
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will learn what the best value will be and I need some feedback on that.<br>
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<LI>The UPS semafore <b>upsalarm</b> will be checked. This means that the system is running on
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battery power and no new jobs are started.
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<LI>The UPS semafore <b>upsdown</b> will be checked. This is the fatal one, if
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this one exists <b>mbtask</b> will try to stop all current running jobs.
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If there are no jobs left running then <b>mbtask</b> will stop itself.
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The upsdown semafore means that the system
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will shutdown and power off, that's why it's fatal and there is no way back.<br>
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<LI>The status of the bbs will be checked, is it open or closed. If it is closed, no
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jobs will be started.
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<LI>The Zone Mail Hour is checked. If ZMH begins the semafore's <b>zmh</b> is created and
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a outbound scan is forced.
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If ZMH ends the semafore <b>zmh</b> is removed a new outbound scan is forced.
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<LI>Each twenty seconds a ping is send to the IP addresses defined with <b>mbsetup</b> to
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check if the internet can be reached. If both ping addresses fail, it is assumed that
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the internet can't be reached. <i>Note: this is for future use!</i>
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</OL>
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Each new minute the timestamp of semafore <b>mbtask.last</b> is updated so that you can check that
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<b>mbtask</b> is running. Also each minute is checked if the system configuration files are
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changed, is so they are reloaded. There is no need to stop and start <b>mbtask</b> if you made
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changes to the system configuration.
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Then all kind of internal semafore's will be checked. The commands that are executed have default
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values, but they can be changed wit mbsetup. The commands can be scripts as well.
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The checks and actions are:
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<P>
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<table border=1 bgcolor=#FFFF99 cellspacing=0 cellpadding=3 bordercolor=#000080>
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<tr>
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<th align=left bgcolor=#000080><font color=#FFFFFF>Semafore</font></th>
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<th align=left bgcolor=#000080><font color=#FFFFFF>Speed</font></th>
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<th align=left bgcolor=#000080><font color=#FFFFFF>Tasktype</font></th>
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<th align=left bgcolor=#000080><font color=#FFFFFF>Depends on</font></th>
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<th align=left bgcolor=#000080><font color=#FFFFFF>Job to run</font></th>
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</tr>
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<tr><td>mailout</td><td>Fast</td><td>mbfido</td><td>Max. 1 mbfido task</td><td>mbfido scan web -quiet</td></tr>
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<tr><td>mailin</td><td>Fast</td><td>mbfido</td><td>Max. 1 mbfido task</td><td>mbfido tic toss web -quiet</td></tr>
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<tr><td>newnews</td><td>Fast</td><td>mbfido</td><td>Max. 1 mbfido task</td><td>mbfido news web -quiet</td></tr>
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<tr><td>mbindex</td><td>Fast</td><td>mbindex</td><td>No other tasks</td><td>mbindex -quiet and if exist: goldnode</td></tr>
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<tr><td>msglink</td><td>Fast</td><td>mbfido</td><td>No other tasks</td><td>mbmsg link -quiet</td></tr>
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<tr><td>reqindex</td><td>Fast</td><td>mbfile</td><td>No other tasks</td><td>mbfile index -quiet</td></tr>
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<tr><td>scanout</td><td>Slow</td><td>call</td><td>Only 1 call task</td><td>mbcico -r1</td></tr>
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</table>
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<P>
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The Fast and Slow values mean: Fast is each second, Slow is check each 20 seconds.
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As you can see, the system will not do too much at the same time. Jobs like compiling
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new nodelists or create file request indexes have a very low priority. Because this
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daemon checks the semafore's each second it responds much better that the old scripts
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running on the cron daemon. The system will be expanded so that more outgoing calls
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will be done at the same time, ie. ISDN and analogue calls, and if they are present
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internet calls, will be made at the same time.
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<P>
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The <b>mbtask</b> program keeps also track of a unique number generator, this is
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just a simple counter that is increased each time it is asked for a new number.
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It will take years for the numbers to repeat. Even if the status file is lost
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the chance that numbers are repeated on your system are almost zero. The first
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time the counter is initialized it is set to the current unix time in seconds
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since 1 januari 1970. This counter is used by several programs to create unique
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.pkt filenames, msgid numbers etc.
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<P> <P>
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<H3>Environment.</H3>
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<P>
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In order to run <strong>mbtask</strong> you must set the global variable
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<strong>$MBSE_ROOT</strong>. This variable must point to the root directory
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of the bbs structure.
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<P> <P>
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<H3>Security.</H3>
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<P>
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<strong>mbtask</strong is installed setuid root. This is needed to initialize
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a raw socket for the ping function. After that is done the privilege drops to
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user <strong>mbse</strong> before the child process is created and the rest
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of the initialisation is done.
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The child process can never get root privileges because it is spawned by user mbse.
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<P> <P>
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<H3>Communications.</H3>
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<P>
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Communication between the server and the clients is established by
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Unix datagram sockets. There can be only 1 server running.
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The server will accept connections from clients on your local machine only.
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The limit for the amount of clients that can connect to the server is set to 100.
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<P>
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The server creates a Unix datagram socket at startup and waits for connections.
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The name of this this socket is /opt/mbse/tmp/mbtask.
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When a client connects it creates a Unix datagram socket in /opt/mbse/tmp, the name is
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the name of the program, added with the pid of the program. So if <b>mbcico</b> is started
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with pid 2312 the socket will be /opt/mbse/tmp/mbcico2312.
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<P>
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All commands are 4 capital letters followed by a colon, a number indicating
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how much data fields will follow. If that number is higher than zero, the
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data fields are seperated with commas. The command is terminated
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with a ; character. Examples are:<br>
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<pre>
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GCLO:0; Zero datafields command.
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DOPE:1,dbname; One datafield command.
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</pre>
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All commands will receive a reply as soon as possible. If a
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resource is temporary not available, a reply will follow too, telling
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this condition. Replies can also contain optional data. Examples:<br>
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<pre>
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100:0; Response 100, no data.
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200:1,Syntax error; One datafield.
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</pre>
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The server has a 10 minute timeout for receiving data when a connection
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is established. The clients need to "ping" the server at regular intervals
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to prevent a disconnect. All official MBSE BBS programs do that. The pid
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send with most commands is the pid of the calling program. Since this number
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is unique, it is used to keep track of the connected clients.
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<P>
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The commands are divided in 26 catagories, most unused at this time.
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<P>
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<pre>
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Catagories:
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Cat. Description
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---- -------------------------------------------
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Axxx Accounting, system monitor info etc.
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Cxxx Chatting
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Gxxx Global commands.
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Sxxx Status commands.
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Group A, Accounting.
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Command: AINI:5,pid,tty,uid,prg,city; Initialize connection, and who am I.
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Reply: 100:0; Ok.
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200:1,Syntax Error; Error.
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Command: ADOI:2,pid,doing; What am I doing right now.
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Reply: 100:0; Ok.
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200:1,Syntax Error; Error.
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Command: ACLO:1,pid; Close my connection.
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Reply: 107:0; Connection closed.
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200:1,Syntax Error; Error, connection is still open.
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Command: ALOG:5,fil,prg,pid,grade,txt; Write a line of text in logfile with grade.
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Reply: 100:0; Ok.
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201:1,errno; Error, number in errno.
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Command: AUSR:3,pid,uid,city; Set username and city
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Reply: 100:0; Ok.
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200:1,Syntax Error; Error.
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Command: ADIS:2,pid,flag; Set Do Not Disturb flag.
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Reply: 100:0; Ok.
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200:1,Syntax Error; Error.
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Command: ATIM:1,time; Set new Client/Server timer in seconds.
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Reply: 100:0; Ok.
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200:1,Syntax Error; Error.
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Command: ADEF:0; Set Client/Server timer to default (10 minutes).
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Reply: 100:0; Ok.
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200:1,Syntax Error; Error.
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Command: ATTY:2,pid,tty; Set new tty name.
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Reply: 100:0; Ok.
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200:1,Syntax Error; Error.
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Group C, Chatting (just some ideas).
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Command: CIPM:1,pid; Is Personal Message present.
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Reply: 100:2,fromname,message; Yes, from .. with message text.
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100:0; No.
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Command: CSPM:3,fromuser,touser,txt; Send personal message to user.
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Reply: 100:1,n; n: 0=Ok, 1=Do not disturb, 2=Buffer full, 3=Error.
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100:0; Impossible.
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The next commands are some ideas, they are not implemented.
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Channel 0 will be for sysop chat only, other channels are
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user channels.
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-CBPM:2,fromuser,txt; Broadcast message to all users.
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-CJCH:2,pid,channel; Join Channel
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-CCCH:2,pid,channel; Close Channel
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-CAML:2,channel,text; Add textline to channel
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-CIML:1,channel; Is new textline present
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-CSSP:1,user,reason; Send Sysop Page
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-CESP:1,user; Retract Sysop Page
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-CRSP:1,user; Reject user Page
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-CFCH:2,channel,user; Force user in chatmode (for Sysop chat).
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-CKCH:2,channel,user; Kill user chatmode (for Sysops and moderators).
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Group G, Global commands.
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Command: GNOP:0; No OPerations.
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Reply: 100:0; Ok.
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Command: GPNG:1,data; Ping, echo data.
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Reply: 100:1,data; Ping reply.
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Command: GVER:0; Give server version.
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Reply: 100:1,Version ....; Version reply.
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Command: GSTA:0; Get complete mbsed status record. (13 fields)
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Reply: 100:19,start,laststart,daily,startups,clients,tot_clients,tot_peak,syntax_errs,
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com_errs,today_clients,today_peak,today_syntax,today_comerr,bbsopen,
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is_zmh,processing,system_load,sequence;
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Command: GMON:1,n; Get registration info line, 1=First, 0=Next line.
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Reply: 100:7,pid,tty,user,program,city,isdoing,starttime;
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100:0; No more lines.
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Command: GDST:0; Get filesystem status (see note below).
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100:n,data1, ..., data10; Maximum 10 filesystems datalines.
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Command: GSYS:0; Get bbs statistics.
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100:7,calls,pots_calls,isdn_calls,network_calls,local_calls,startdate,lastcaller;
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Command: GLCC:0; Get Lastcallers count
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100,1,n; Return counter value.
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Command: GLCR:1,recno; Get Lastcaller record
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100:9,user,location,level,tty,time,minsmcalls,speed,cations;
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201:1,16; Not available.
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Group S, Status commands.
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Command: SBBS:0; Get BBS Status (open, zmh, shutdown).
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Reply: 100:2,0,The system is open for use;
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100:2,1,The system is closed right now!;
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100:2,2,The system is closed for Zone Mail Hour!;
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Command: SOPE:0; Open the BBS.
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Reply: 100:0; Ok.
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Command: SCLO:1,mesage; Close the BBS with reason.
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Reply: 100:0; Ok.
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Command: SFRE:0; Is the BBS Free.
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Reply: 100:1,Running utilities: n Active users: n;
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100:0; It's free.
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Command: SSEQ:0; Get next unique sequence number.
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Reply: 100:1,number; Next unique sequence number.
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Command: SEST:1,semafore; Get status of internal semafore.
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Reply: 100:1,n; 1 = set, 0 = not set.
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200:1,16; Semafore not known.
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Command: SECR:1,semafore; Set semafore
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Reply: 100:0; Ok.
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200:1,16; Error.
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Command: SERM:1,semafore; Remove semafore
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Reply: 100:0; Ok (also if there was no semafore).
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200:1,16; Semafore not known.
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</pre>
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Note: in reply of GDST the reply is 100:n,size free mountpoint fstype,.....
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where n = 1 for 1 filesystem, and 10 for a total of 10 filesystems. There
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will never be a reply for more then 10 filesystems. The reported filesystems
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are retrieved from /etc/mtab which is the actual mountstatus. This is used
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by the <b>mbmon</b> program to get a "live" view of your filesystems.
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<P> <P>
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