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<TITLE>Running DOS doors on MBSE BBS.</TITLE>
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<div align='right'><h5>Last update 09-Aug-2004</h5></div>
<div align='center'><H1>MBSE BBS - Running DOS doors.</H1></div>
<h3>Introduction</h3>
<p>
Running DOS doors is possible on systems that can run
<a href="http://www.dosemu.org">dosemu</a>. The latest versions of dosemu don't
need to be started suid root or started using sudo, it can run as the user that
is logged in the bbs. Since that is possible, a new location for the virtual C:
drive is now being used withing the $MBSE_ROOT file structure. This virtual C:
drive is owned by the group bbs. The basic ideas how doors should be run written
by Redy Rodriguez are still valid, but some scripts are changed and some dosemu
files must be copied into the mbse directory tree.
<p>&nbsp;<p>
<h3>Installing dosemu</h3>
<p>
Some distributions have good dosemu packages, others don't. You need a dosemu
that can be used in a systemwide multiuser setup. The bad packages want to have
the dos drive in each users home directory, this is not what we want for doors.
If you don't have a good dosemu you have to compile your own. This is not too
complicated. First download the source from <a
href="http://www.dosemu.org">dosemu</a>. You don't need the freedos-bin source
if you are going to use ms-dos or pc-dos.
Unpack the source in some directory of your choice and compile the sources:<br>
<pre>
mbse@seaport$ tar xfvz dosemu-1.2.2.tgz
mbse@seaport$ cd dosemu-1.2.2
mbse@seaport:~/dosemu-1.2.2$ ./configure --prefix=/usr --sysconfdir=/etc/dosemu --with-x
mbse@seaport:~/dosemu-1.2.2$ make
</pre>
Note that the <code>--with-x</code> is not needed for running doors, but it
might be handy that you can use dosemu as user mbse in X to do maintenance on
your doors.<br>
Then as root do:<br>
<pre>
root@seaport:~/dosemu-1.2.2# make install
</pre>
<p>&nbsp;<p>
<h3>Setup dosemu in mbse</h3>
<p>
First copy <code>/etc/dosemu/dosemu.conf</code> into <code>~/etc/dosmeu</code>.
Then edit <code>~/etc/dosemu/dosemu.conf</code> so that we have a version for
mbse users. Set the following settings in that file:<br>
<pre>
$_hdimage = "/opt/mbse/var/dosemu/c"
$_floppy_a = ""
$_xms = (1024)
$_ems = (2048)
$_dpmi = (0x1000)
$_layout = "us"
</pre>
Next we need to setup the C: drive. Do this as user mbse. First type <code>umask
007</code>, this sets the create mode for directories to 0770 and files to 0660
so that we create all files and directories read/write for all bbs users. This
is very important! Type the following commands:
<pre>
mbse@seaport:~$ umask 007
mbse@seaport:~$ cd var/dosemu/c
mbse@seaport:~/var/dosemu/c$ mkdir dos dosemu temp util doors
</pre>
Now we must install dos. If you use ms-dos then in <code>~/var/dosemu/c</code>
copy the ms-dos files <code>command.com</code>, <code>io.sys</code> and
<code>msdos.sys</code>. In <code>~/var/dosemu/c/dos</code> copy all ms-dos
commands. Next install the dosemu utilities, copy these from
<code>/usr/share/dosemu/freedos/dosemu</code> to
<code>~/var/dosemu/c/dosemu</code>. Now there is a empty
<code>~/var/dosemu/c/util</code>, copy some utilities here such as your
favourite dos editor, zip and unzip etc.<br>
Next we must create <code>config.sys</code> and <code>autoexec.bat</code>. These
files must be dos crlf formatted. You can do that with the joe editor, for
example <code>joe -crlf config.sys</code>. Examples:<br>
<code>config.sys</code><br>
<pre>
BUFFERS = 20
DEVICE=C:\DOS\SETVER.EXE
SET TEMP=C:\TEMP
DOS=HIGH,UMB
FILES=50
</pre>
<code>autoexec.bat</code><br>
<pre>
@ECHO OFF
PROMPT $P$G
PATH C:\DOSEMU;C:\DOS;C:\UTIL;
SET TEMP=C:\TEMP
Lh C:\DOS\DOSKEY /INSERT
Lh C:\DOS\SHARE
</pre>
Now we are ready to try it, type <code>mbsedos</code> and the dos emulator
should start. You can leave dosemu with the command <code>exitemu</code>.
<p>&nbsp;</P>
<h3>Installing a door</h3>
<p>
All doors are started using the script <code>~/bin/rundoor.sh</code>. This script
is never started directly, you should make a copy of that with the name of the
door, but the best solution is to make a symlink with the name of the door. For
example:<br>
<pre>
mbse@seaport$ cd ~/bin
mbse@seaport:~bin$ ln -s rundoor.sh 8ball
</pre>
See also inside <code>rundoor.sh</code> for the instructions. This file does
several things, first it prepares the users home directory with the dosemu
environment so that dosemu will run for the user. Then it creates a node
directory in the dos C: drive and copies the door dropfiles into that node
directory. Finally it starts dosemu in virtual comport mode and inserts the
commands in dos to start the door.<br>
But before we can run the door, the door itself must be installed in the dos
partition.
<img src="images/doors.png" alt="door setup" border="0">
<p>&nbsp;<p>
<h3>What if I don't upgrade</h3>
<p>
That's your choice, but for a while the old method starting dosemu via sudo is
still supported. The file <code>~/bin/bbsdoor.sh</code> is still there, but the
file <code>~/bin/rundoor.sh</code> is renamed to
<code>~/bin/runvirtual.sh</code>. So you should change all symlinks of your door
names in <code>~/bin</code> (or copies) to <code>~/bin/runvirtual.sh</code>. You
should not need to change anything else.
<p>
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