189 lines
7.4 KiB
Markdown
189 lines
7.4 KiB
Markdown
---
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layout: page
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title: Local Doors
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---
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## Local Doors
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ENiGMA½ has many ways to add doors to your system. In addition to the many built in door server modules, local doors are of course also supported using the ! The `abracadabra` module!
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## The abracadabra Module
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The `abracadabra` module provides a generic and flexible solution for many door types. Through this module you can execute native processes & scripts directly, and perform I/O through standard I/O (stdio) or a temporary TCP server.
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### Configuration
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The `abracadabra` `config` block can contain the following members:
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* `name`: Used as a key for tracking number of clients using a particular door.
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* `dropFileType`: Specifies the type of drop file to generate (See **Argument Variables** below).
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* `cmd`: Path to executable to launch.
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* `args`: Array of argument(s) to pass to `cmd`. See below for information on variables that can be used here.
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* `cwd`: Set the Current Working Directory for `cmd`. Defaults to the directory of `cmd`.
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* `nodeMax`: Max number of nodes that can access this door at once. Uses `name` as a mapping key
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* `tooManyArt`: Art file spec to display if too many instances are already in use
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* `io`: Where to process I/O. Can be `stdio` or `socket`. When using `stdio`, I/O is input/output from stdin/stdout. When using `socket` a temporary socket server is spawned that can be connected to. The server listens on localhost on `{srvPort}` (see below under Argument Variables).
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* `encoding`: Specify the door's encoding. Defaults to `cp437`. Linux binaries for example, often produce `utf8`.
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#### Drop File Types
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Drop file types specified by `dropFileType`:
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* `DOOR`: [DOOR.SYS](http://goldfndr.home.mindspring.com/dropfile/doorsys.htm)
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* `DOOR32`: [DOOR32.SYS](https://raw.githubusercontent.com/NuSkooler/ansi-bbs/master/docs/dropfile_formats/door32_sys.txt)
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* `DORINFO`: [DORINFOx.DEF](http://goldfndr.home.mindspring.com/dropfile/dorinfo.htm)
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#### Argument Variables
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The following variables may be used in `args` entries:
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* `{node}`: Current node number.
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* `{dropFile}`: Drop _filename_ only.
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* `{dropFilePath}`: Full path to generated drop file.
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* `{userId}`: Current user ID.
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* `{userName}`: _Sanitized_ username. Safe for filenames, etc.
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* `{userNameRaw}`: _Raw_ username. May not be safe for filenames!
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* `{srvPort}`: Temporary server port when `io` is set to `socket`.
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* `{cwd}`: Current Working Directory.
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Example:
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```hjson
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args: [
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"-D", "{dropFile}", "-N", "{node}"
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]
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```
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### DOSEMU with abracadabra
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[DOSEMU](http://www.dosemu.org/) 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.
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As an example, here are the steps for setting up Pimp Wars:
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First, create a `dosemu.conf` file with the following contents:
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```
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$_cpu = "80486"
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$_cpu_emu = "vm86"
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$_external_char_set = "utf8"
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$_internal_char_set = "cp437"
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$_term_updfreq = (8)
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$_layout = "us"
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$_rawkeyboard = (0)
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$_com1 = "virtual"
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```
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The line `$_com1 = "virtual"` tells DOSEMU to use `stdio` as a virtual serial port on COM1.
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Next, we create a virtual **X** drive for Pimp Wars to live such as `/enigma-bbs/DOS/X/PW` and map it with a custom `autoexec.bat` file within DOSEMU:
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```
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@echo off
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path d:\bin;d:\gnu;d:\dosemu
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set TEMP=c:\tmp
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prompt $P$G
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REM http://www.pcmicro.com/bnu/
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C:\BNU\BNU.COM /L0:57600,8N1 /F
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lredir.com x: linux\fs\enigma-bbs\DOS\X
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unix -e
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```
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Note that we also have the [BNU](http://www.pcmicro.com/bnu/) FOSSIL driver installed at `C:\BNU\\`. Another option would be to install this to X: somewhere as well.
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Finally, let's create a `menu.hjson` entry to launch the game:
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```hjson
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doorPimpWars: {
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desc: Playing PimpWars
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module: abracadabra
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config: {
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name: PimpWars
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dropFileType: DORINFO
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cmd: /usr/bin/dosemu
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args: [
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"-quiet",
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"-f",
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"/path/to/dosemu.conf",
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"X:\\PW\\START.BAT {dropFile} {node}"
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],
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nodeMax: 1
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tooManyArt: DOORMANY
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io: stdio
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}
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}
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```
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### QEMU with abracadabra
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[QEMU](http://wiki.qemu.org/Main_Page) provides a robust, cross platform solution for launching doors under many platforms (likely anwywhere Node.js is supported and ENiGMA½ can run). Note however that there is an important and major caveat: **Multiple instances of a particular door/OS image should not be run at once!** Being more flexible means being a bit more complex. Let's look at an example for running L.O.R.D. under a UNIX like system such as Linux or FreeBSD.
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Basically we'll be creating a bootstrap shell script that generates a temporary node specific `go.bat` to launch our door. This will be called from `autoexec.bat` within our QEMU FreeDOS partition.
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#### Step 1: Create a FreeDOS image
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[FreeDOS](http://www.freedos.org/) is a free mostly MS-DOS compatible DOS package that works well for running 16bit doors. Follow the [QEMU/FreeDOS](https://en.wikibooks.org/wiki/QEMU/FreeDOS) guide for creating an `freedos_c.img`. This will contain FreeDOS itself and installed BBS doors.
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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 QEMU's vfat as a drive. For example:
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```bash
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qemu-system-i386 -localtime /home/enigma/dos/images/freedos_c.img -hdb fat:/path/to/downloads
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```
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With the above you can now copy files from D: to C: within FreeDOS and add the following to it's `autoexec.bat`:
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```batch
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CALL E:\GO.BAT
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```
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#### Step 2: Create a bootstrap script
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Our bootstrap script will prepare `GO.BAT` and launch FreeDOS. Below is an example:
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```bash
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#!/bin/bash
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NODE=$1
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DROPFILE=D:\\$2
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SRVPORT=$3
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mkdir -p /home/enigma/dos/go/node$NODE
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cat > /home/enigma/dos/go/node$NODE/GO.BAT <<EOF
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C:
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CD \FOSSIL\BNU
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BNU.COM
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CD \DOORS\LORD
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COPY /Y $DROPFILE
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CALL START.BAT $NODE
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FDAPM POWEROFF
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EOF
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unix2dos /home/enigma/dos/go/node$NODE/GO.BAT
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qemu-system-i386 -localtime /home/enigma/dos/images/freedos_c.img -chardev socket,port=$SRVPORT,nowait,host=localhost,id=s0 -device isa-serial,chardev=s0 -hdb fat:/home/enigma/xibalba/dropfiles/node$NODE -hdc fat:/home/enigma/dos/go/node$NODE -nographic
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```
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Note the `qemu-system-i386` line. We're 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 `-hdb` entry will represent the D: drive where our drop file is generated, while `-hdc` is the path that `GO.BAT` is generated in (`E:\GO.BAT`). Finally we specify `-nographic` to run headless.
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For doors that do not *require* a FOSSIL driver, it is recommended to not load or use one unless you are having issues.
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##### Step 3: Create a menu entry
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Finally we can create a `menu.hjson` entry using the `abracadabra` module:
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```hjson
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doorLORD: {
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desc: Playing L.O.R.D.
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module: abracadabra
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config: {
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name: LORD
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dropFileType: DOOR
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cmd: /home/enigma/dos/scripts/lord.sh
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args: [
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"{node}",
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"{dropFile}",
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"{srvPort}",
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],
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nodeMax: 1
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tooManyArt: DOORMANY
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io: socket
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}
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}
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```
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## Shared Socket Descriptors
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As of this writing `DOOR32.SYS` style socket descriptor sharing is **not** supported. Workarounds include using the Telnet Bridge (`telnet_bridge` module) to hook up to local Telnet-accessible door servers such as [NET2BBS](http://pcmicro.com/netfoss/guide/net2bbs.html).
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## Additional Resources
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### DOSBox
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* [DOSBox-X](https://github.com/joncampbell123/dosbox-x)
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### Door Downloads & Support Sites
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#### General
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* http://bbsfiles.com/
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* http://bbstorrents.bbses.info/
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#### L.O.R.D.
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* http://lord.lordlegacy.com/ |