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<h1 class="page-title">Local Doors</h1>
<h2 id="local-doors">Local Doors</h2>
<p>ENiGMA½ has many ways to add doors to your system. In addition to the <a href="/enigma-bbs/modding/door-servers.html">many built in door server modules</a>, local doors are of course also supported using the ! The <code class="language-plaintext highlighter-rouge">abracadabra</code> module!</p>
<blockquote>
<p><img class="emoji" title=":information_source:" alt=":information_source:" src="https://github.githubassets.com/images/icons/emoji/unicode/2139.png" height="20" width="20"> See also <a href="https://medium.com/retro-future/lets-add-a-dos-game-to-enigma-1-2-41f257deaa3c">Lets add a DOS door to Enigma½ BBS</a> by Robbie Whiting for a great writeup on adding doors!</p>
</blockquote>
<h2 id="the-abracadabra-module">The abracadabra Module</h2>
<p>The <code class="language-plaintext highlighter-rouge">abracadabra</code> module provides a generic and flexible solution for many door types. Through this module you can execute native processes &amp; scripts directly, and perform I/O through standard I/O (stdio) or a temporary TCP server.</p>
<h3 id="configuration">Configuration</h3>
<p>The <code class="language-plaintext highlighter-rouge">abracadabra</code> <code class="language-plaintext highlighter-rouge">config</code> block can contain the following members:</p>
<table>
<thead>
<tr>
<th>Item</th>
<th>Required</th>
<th>Description</th>
</tr>
</thead>
<tbody>
<tr>
<td><code class="language-plaintext highlighter-rouge">name</code></td>
<td><img class="emoji" title=":+1:" alt=":+1:" src="https://github.githubassets.com/images/icons/emoji/unicode/1f44d.png" height="20" width="20"></td>
<td>Used as a key for tracking number of clients using a particular door.</td>
</tr>
<tr>
<td><code class="language-plaintext highlighter-rouge">dropFileType</code></td>
<td><img class="emoji" title=":-1:" alt=":-1:" src="https://github.githubassets.com/images/icons/emoji/unicode/1f44e.png" height="20" width="20"></td>
<td>Specifies the type of dropfile to generate (See <strong>Dropfile Types</strong> below). Can be omitted or set to <code class="language-plaintext highlighter-rouge">none</code>.</td>
</tr>
<tr>
<td><code class="language-plaintext highlighter-rouge">cmd</code></td>
<td><img class="emoji" title=":+1:" alt=":+1:" src="https://github.githubassets.com/images/icons/emoji/unicode/1f44d.png" height="20" width="20"></td>
<td>Path to executable to launch.</td>
</tr>
<tr>
<td><code class="language-plaintext highlighter-rouge">args</code></td>
<td><img class="emoji" title=":-1:" alt=":-1:" src="https://github.githubassets.com/images/icons/emoji/unicode/1f44e.png" height="20" width="20"></td>
<td>Array of argument(s) to pass to <code class="language-plaintext highlighter-rouge">cmd</code>. See <strong>Argument Variables</strong> below for information on variables that can be used here.</td>
</tr>
<tr>
<td><code class="language-plaintext highlighter-rouge">cwd</code></td>
<td><img class="emoji" title=":-1:" alt=":-1:" src="https://github.githubassets.com/images/icons/emoji/unicode/1f44e.png" height="20" width="20"></td>
<td>Sets the Current Working Directory (CWD) for <code class="language-plaintext highlighter-rouge">cmd</code>. Defaults to the directory of <code class="language-plaintext highlighter-rouge">cmd</code>.</td>
</tr>
<tr>
<td><code class="language-plaintext highlighter-rouge">env</code></td>
<td><img class="emoji" title=":-1:" alt=":-1:" src="https://github.githubassets.com/images/icons/emoji/unicode/1f44e.png" height="20" width="20"></td>
<td>Sets the environment. Supplied in the form of an map: <code class="language-plaintext highlighter-rouge">{ SOME_VAR: "value" }</code>
</td>
</tr>
<tr>
<td><code class="language-plaintext highlighter-rouge">nodeMax</code></td>
<td><img class="emoji" title=":-1:" alt=":-1:" src="https://github.githubassets.com/images/icons/emoji/unicode/1f44e.png" height="20" width="20"></td>
<td>Max number of nodes that can access this door at once. Uses <code class="language-plaintext highlighter-rouge">name</code> as a tracking key.</td>
</tr>
<tr>
<td><code class="language-plaintext highlighter-rouge">tooManyArt</code></td>
<td><img class="emoji" title=":-1:" alt=":-1:" src="https://github.githubassets.com/images/icons/emoji/unicode/1f44e.png" height="20" width="20"></td>
<td>Art spec to display if too many instances are already in use.</td>
</tr>
<tr>
<td><code class="language-plaintext highlighter-rouge">io</code></td>
<td><img class="emoji" title=":-1:" alt=":-1:" src="https://github.githubassets.com/images/icons/emoji/unicode/1f44e.png" height="20" width="20"></td>
<td>How to process input/output (I/O). Can be <code class="language-plaintext highlighter-rouge">stdio</code> or <code class="language-plaintext highlighter-rouge">socket</code>. When using <code class="language-plaintext highlighter-rouge">stdio</code>, I/O is handled via standard stdin/stdout. When using <code class="language-plaintext highlighter-rouge">socket</code> a temporary socket server is spawned that can be connected back to. The server listens on localhost on <code class="language-plaintext highlighter-rouge">{srvPort}</code> (See <strong>Argument Variables</strong> below for more information). Default value is <code class="language-plaintext highlighter-rouge">stdio</code>.</td>
</tr>
<tr>
<td><code class="language-plaintext highlighter-rouge">encoding</code></td>
<td><img class="emoji" title=":-1:" alt=":-1:" src="https://github.githubassets.com/images/icons/emoji/unicode/1f44e.png" height="20" width="20"></td>
<td>Sets the <strong>doors</strong> encoding. Defaults to <code class="language-plaintext highlighter-rouge">cp437</code>. Linux binaries often produce <code class="language-plaintext highlighter-rouge">utf8</code>.</td>
</tr>
</tbody>
</table>
<h4 id="dropfile-types">Dropfile Types</h4>
<p>Dropfile types specified by <code class="language-plaintext highlighter-rouge">dropFileType</code>:</p>
<table>
<thead>
<tr>
<th>Value</th>
<th>Description</th>
</tr>
</thead>
<tbody>
<tr>
<td><code class="language-plaintext highlighter-rouge">DOOR</code></td>
<td><a href="https://web.archive.org/web/20160325192739/http://goldfndr.home.mindspring.com/dropfile/doorsys.htm">DOOR.SYS</a></td>
</tr>
<tr>
<td><code class="language-plaintext highlighter-rouge">DOOR32</code></td>
<td><a href="https://raw.githubusercontent.com/NuSkooler/ansi-bbs/master/docs/dropfile_formats/door32_sys.txt">DOOR32.SYS</a></td>
</tr>
<tr>
<td><code class="language-plaintext highlighter-rouge">DORINFO</code></td>
<td><a href="https://web.archive.org/web/20160321190038/http://goldfndr.home.mindspring.com/dropfile/dorinfo.htm">DORINFOx.DEF</a></td>
</tr>
</tbody>
</table>
<h4 id="argument-variables">Argument Variables</h4>
<p>The following variables may be used in <code class="language-plaintext highlighter-rouge">args</code> entries:</p>
<table>
<thead>
<tr>
<th>Variable</th>
<th>Description</th>
<th>Example</th>
</tr>
</thead>
<tbody>
<tr>
<td><code class="language-plaintext highlighter-rouge">{node}</code></td>
<td>Current node number.</td>
<td><code class="language-plaintext highlighter-rouge">1</code></td>
</tr>
<tr>
<td><code class="language-plaintext highlighter-rouge">{dropFile}</code></td>
<td>Dropfile <em>filename</em> only.</td>
<td><code class="language-plaintext highlighter-rouge">DOOR.SYS</code></td>
</tr>
<tr>
<td><code class="language-plaintext highlighter-rouge">{dropFilePath}</code></td>
<td>Full path to generated dropfile. The system places dropfiles in the path set by <code class="language-plaintext highlighter-rouge">paths.dropFiles</code> in <code class="language-plaintext highlighter-rouge">config.hjson</code>.</td>
<td><code class="language-plaintext highlighter-rouge">C:\enigma-bbs\drop\node1\DOOR.SYS</code></td>
</tr>
<tr>
<td><code class="language-plaintext highlighter-rouge">{userId}</code></td>
<td>Current user ID.</td>
<td><code class="language-plaintext highlighter-rouge">420</code></td>
</tr>
<tr>
<td><code class="language-plaintext highlighter-rouge">{userName}</code></td>
<td>
<a href="https://www.npmjs.com/package/sanitize-filename">Sanitized</a> username. Safe for filenames, etc. If the full username is sanitized away, this will resolve to something like “user_1234”.</td>
<td><code class="language-plaintext highlighter-rouge">izard</code></td>
</tr>
<tr>
<td><code class="language-plaintext highlighter-rouge">{userNameRaw}</code></td>
<td>
<em>Raw</em> username. May not be safe for filenames!</td>
<td><code class="language-plaintext highlighter-rouge">\/\/izard</code></td>
</tr>
<tr>
<td><code class="language-plaintext highlighter-rouge">{srvPort}</code></td>
<td>Temporary server port when <code class="language-plaintext highlighter-rouge">io</code> is set to <code class="language-plaintext highlighter-rouge">socket</code>.</td>
<td><code class="language-plaintext highlighter-rouge">1234</code></td>
</tr>
<tr>
<td><code class="language-plaintext highlighter-rouge">{cwd}</code></td>
<td>Current Working Directory.</td>
<td><code class="language-plaintext highlighter-rouge">/home/enigma-bbs/doors/foo/</code></td>
</tr>
</tbody>
</table>
<p>Example <code class="language-plaintext highlighter-rouge">args</code> member using some variables described above:</p>
<pre><code class="language-hjson">args: [
"-D", "{dropFilePath}",
"-N", "{node}"
"-U", "{userId}"
]
</code></pre>
<h3 id="dosemu-with-abracadabra">DOSEMU with abracadabra</h3>
<p><a href="http://www.dosemu.org/">DOSEMU</a> can provide a good solution for running legacy DOS doors when running on Linux systems. For this, we will create a virtual serial port (COM1) that communicates via stdio.</p>
<p>As an example, here are the steps for setting up Pimp Wars:</p>
<p>First, create a <code class="language-plaintext highlighter-rouge">dosemu.conf</code> file with the following contents:</p>
<div class="language-plaintext highlighter-rouge"><div class="highlight"><pre class="highlight"><code>$_cpu = "80486"
$_cpu_emu = "vm86"
$_external_char_set = "utf8"
$_internal_char_set = "cp437"
$_term_updfreq = (8)
$_layout = "us"
$_rawkeyboard = (0)
$_com1 = "virtual"
</code></pre></div></div>
<p>The line <code class="language-plaintext highlighter-rouge">$_com1 = "virtual"</code> tells DOSEMU to use <code class="language-plaintext highlighter-rouge">stdio</code> as a virtual serial port on COM1.</p>
<p>Next, we create a virtual <strong>X</strong> drive for Pimp Wars to live such as <code class="language-plaintext highlighter-rouge">/enigma-bbs/DOS/X/PW</code> and map it with a custom <code class="language-plaintext highlighter-rouge">AUTOEXEC.BAT</code> file within DOSEMU:</p>
<div class="language-plaintext highlighter-rouge"><div class="highlight"><pre class="highlight"><code>@echo off
path d:\bin;d:\gnu;d:\dosemu
set TEMP=c:\tmp
prompt $P$G
REM http://www.pcmicro.com/bnu/
C:\BNU\BNU.COM /L0:57600,8N1 /F
lredir.com x: linux\fs\enigma-bbs\DOS\X
unix -e
</code></pre></div></div>
<p>Note that we also have the <a href="http://www.pcmicro.com/bnu/">BNU</a> FOSSIL driver installed at <code class="language-plaintext highlighter-rouge">C:\BNU\\</code>. Another option would be to install this to X: somewhere as well.</p>
<p>Finally, lets create a <code class="language-plaintext highlighter-rouge">menu.hjson</code> entry to launch the game:</p>
<pre><code class="language-hjson">doorPimpWars: {
desc: Playing PimpWars
module: abracadabra
config: {
name: PimpWars
dropFileType: DORINFO
cmd: /usr/bin/dosemu
args: [
"-quiet",
"-f",
"/path/to/dosemu.conf",
"X:\\PW\\START.BAT {dropFile} {node}"
],
nodeMax: 1
tooManyArt: DOORMANY
io: stdio
}
}
</code></pre>
<h3 id="shared-socket-descriptors">Shared Socket Descriptors</h3>
<p>Due to Node.js limitations, ENiGMA½ does not <em>directly</em> support <code class="language-plaintext highlighter-rouge">DOOR32.SYS</code> style socket descriptor sharing (other <code class="language-plaintext highlighter-rouge">DOOR32.SYS</code> features are fully supported). However, a separate binary called <a href="https://github.com/NuSkooler/bivrost">bivrost!</a> can be used. bivrost! is available for Windows and Linux x86/i686 and x86_64/AMD64. Other platforms where <a href="https://www.rust-lang.org/">Rust</a> builds are likely to work as well.</p>
<h4 id="example-configuration">Example configuration</h4>
<p>Below is an example <code class="language-plaintext highlighter-rouge">menu.hjson</code> entry using bivrost! to launch a door:</p>
<pre><code class="language-hjson">doorWithBivrost: {
desc: Bivrost Example
module: abracadabra
config: {
name: BivrostExample
dropFileType: DOOR32
cmd: "C:\\enigma-bbs\\utils\\bivrost.exe"
args: [
"--port", "{srvPort}", // bivrost! will connect this port on localhost
"--dropfile", "{dropFilePath}", // ...and read this DOOR32.SYS produced by ENiGMA½
"--out", "C:\\doors\\jezebel", // ...and produce a NEW DOOR32.SYS here.
//
// Note that the final &lt;target&gt; params bivrost! will use to
// launch the door are grouped here. The {fd} variable could
// also be supplied here if needed.
//
"C:\\door\\door.exe C:\\door\\door32.sys"
],
nodeMax: 1
tooManyArt: DOORMANY
io: socket
}
}
</code></pre>
<p>Please see the <a href="https://github.com/NuSkooler/bivrost">bivrost!</a> documentation for more information.</p>
<h4 id="phenom-productions-releases">Phenom Productions Releases</h4>
<p>Pre-built binaries of bivrost! have been released under <a href="https://www.phenomprod.com/">Phenom Productions</a> and can be found on various boards.</p>
<h4 id="alternative-workarounds">Alternative Workarounds</h4>
<p>Alternative workarounds include <a href="/enigma-bbs/modding/telnet-bridge.html">Telnet Bridge module</a> to hook up Telnet-accessible (including local) door servers It may also be possible bridge via <a href="http://pcmicro.com/netfoss/guide/net2bbs.html">NET2BBS</a>.</p>
<h3 id="qemu-with-abracadabra">QEMU with abracadabra</h3>
<p><a href="http://wiki.qemu.org/Main_Page">QEMU</a> provides a robust, cross platform solution for launching doors under many platforms (likely anywhere Node.js is supported and ENiGMA½ can run). Note however that there is an important and major caveat: <strong>Multiple instances of a particular door/OS image should not be run at once!</strong> Being more flexible means being a bit more complex. Lets look at an example for running L.O.R.D. under a UNIX like system such as Linux or FreeBSD.</p>
<p>Basically well be creating a bootstrap shell script that generates a temporary node specific <code class="language-plaintext highlighter-rouge">GO.BAT</code> to launch our door. This will be called from <code class="language-plaintext highlighter-rouge">AUTOEXEC.BAT</code> within our QEMU FreeDOS partition.</p>
<h4 id="step-1-create-a-freedos-image">Step 1: Create a FreeDOS image</h4>
<p><a href="http://www.freedos.org/">FreeDOS</a> is a free mostly MS-DOS compatible DOS package that works well for running 16bit doors. Follow the <a href="https://en.wikibooks.org/wiki/QEMU/FreeDOS">QEMU/FreeDOS</a> guide for creating an <code class="language-plaintext highlighter-rouge">freedos_c.img</code>. This will contain FreeDOS itself and installed BBS doors.</p>
<p>After this is complete, copy LORD to C:\DOORS\LORD within FreeDOS. An easy way to tranfer files from host to DOS is to use QEMUs vfat as a drive. For example:</p>
<div class="language-bash highlighter-rouge"><div class="highlight"><pre class="highlight"><code>qemu-system-i386 <span class="nt">-localtime</span> /home/enigma/dos/images/freedos_c.img <span class="nt">-hdb</span> fat:/path/to/downloads
</code></pre></div></div>
<p>With the above you can now copy files from D: to C: within FreeDOS and add the following to its <code class="language-plaintext highlighter-rouge">autoexec.bat</code>:</p>
<div class="language-bat highlighter-rouge"><div class="highlight"><pre class="highlight"><code><span class="kd">CALL</span> <span class="kd">E</span>:\GO.BAT
</code></pre></div></div>
<h4 id="step-2-create-a-bootstrap-script">Step 2: Create a bootstrap script</h4>
<p>Our bootstrap script will prepare <code class="language-plaintext highlighter-rouge">GO.BAT</code> and launch FreeDOS. Below is an example:</p>
<div class="language-bash highlighter-rouge"><div class="highlight"><pre class="highlight"><code><span class="c">#!/bin/bash</span>
<span class="nv">NODE</span><span class="o">=</span><span class="nv">$1</span>
<span class="nv">DROPFILE</span><span class="o">=</span>D:<span class="se">\\</span><span class="nv">$2</span>
<span class="nv">SRVPORT</span><span class="o">=</span><span class="nv">$3</span>
<span class="nb">mkdir</span> <span class="nt">-p</span> /home/enigma/dos/go/node<span class="nv">$NODE</span>
<span class="nb">cat</span> <span class="o">&gt;</span> /home/enigma/dos/go/node<span class="nv">$NODE</span>/GO.BAT <span class="o">&lt;&lt;</span><span class="no">EOF</span><span class="sh">
C:
CD </span><span class="se">\F</span><span class="sh">OSSIL</span><span class="se">\B</span><span class="sh">NU
BNU.COM
CD </span><span class="se">\D</span><span class="sh">OORS</span><span class="se">\L</span><span class="sh">ORD
COPY /Y </span><span class="nv">$DROPFILE</span><span class="sh">
CALL START.BAT </span><span class="nv">$NODE</span><span class="sh">
FDAPM POWEROFF
</span><span class="no">EOF
</span>unix2dos /home/enigma/dos/go/node<span class="nv">$NODE</span>/GO.BAT
qemu-system-i386 <span class="nt">-localtime</span> /home/enigma/dos/images/freedos_c.img <span class="nt">-chardev</span> socket,port<span class="o">=</span><span class="nv">$SRVPORT</span>,nowait,host<span class="o">=</span>localhost,id<span class="o">=</span>s0 <span class="nt">-device</span> isa-serial,chardev<span class="o">=</span>s0 <span class="nt">-hdb</span> fat:/home/enigma/xibalba/dropfiles/node<span class="nv">$NODE</span> <span class="nt">-hdc</span> fat:/home/enigma/dos/go/node<span class="nv">$NODE</span> <span class="nt">-nographic</span>
</code></pre></div></div>
<p>Note the <code class="language-plaintext highlighter-rouge">qemu-system-i386</code> line. Were telling QEMU to launch and use localtime for the clock, create a character device that connects to our temporary server port on localhost and map that to a serial device. The <code class="language-plaintext highlighter-rouge">-hdb</code> entry will represent the D: drive where our dropfile is generated, while <code class="language-plaintext highlighter-rouge">-hdc</code> is the path that <code class="language-plaintext highlighter-rouge">GO.BAT</code> is generated in (<code class="language-plaintext highlighter-rouge">E:\GO.BAT</code>). Finally we specify <code class="language-plaintext highlighter-rouge">-nographic</code> to run headless.</p>
<p>For doors that do not <em>require</em> a FOSSIL driver, it is recommended to not load or use one unless you are having issues.</p>
<h5 id="step-3-create-a-menu-entry">Step 3: Create a menu entry</h5>
<p>Finally we can create a <code class="language-plaintext highlighter-rouge">menu.hjson</code> entry using the <code class="language-plaintext highlighter-rouge">abracadabra</code> module:</p>
<pre><code class="language-hjson">doorLORD: {
desc: Playing L.O.R.D.
module: abracadabra
config: {
name: LORD
dropFileType: DOOR
cmd: /home/enigma/dos/scripts/lord.sh
args: [
"{node}",
"{dropFile}",
"{srvPort}",
],
nodeMax: 1
tooManyArt: DOORMANY
io: socket
}
}
</code></pre>
<h2 id="see-also">See Also</h2>
<ul>
<li><a href="/enigma-bbs/modding/telnet-bridge.html">Telnet Bridge</a></li>
<li><a href="/enigma-bbs/modding/door-servers.html">Door Servers</a></li>
</ul>
<h2 id="additional-resources">Additional Resources</h2>
<h3 id="dos-emulation">DOS Emulation</h3>
<ul>
<li><a href="http://www.dosemu.org/">DOSEMU</a></li>
<li><a href="https://github.com/joncampbell123/dosbox-x">DOSBox-X</a></li>
</ul>
<h3 id="door-downloads--support-sites">Door Downloads &amp; Support Sites</h3>
<h4 id="general">General</h4>
<ul>
<li>http://bbsfiles.com/</li>
<li>http://bbstorrents.bbses.info/</li>
</ul>
<h4 id="lord">L.O.R.D.</h4>
<ul>
<li>http://lord.lordlegacy.com/</li>
</ul>
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