Initial vommit

README.md

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+ledcat webinterface
+===================
+
+1. Stick your executables in `programs`.
+2. Point ledcat to `$FIFO`.
+3. Fire up PHP.
+4. ????
+5. PROFIT

index.php

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+<?php
+
+$TMPDIR = "/tmp/ledcat-www";
+$PIDFILE = "$TMPDIR/program.pid";
+$FIFO = "$TMPDIR/fifo";
+$PROGDIR = "./programs";
+
+
+// Report all errors. Errors should never be ignored, it means that our
+// application is broken and we need to fix it.
+error_reporting(-1);
+
+// Transform PHP's super weird error system to comprehensible exceptions.
+set_error_handler(function($errno, $errstr, $errfile, $errline) {
+	throw new ErrorException($errstr, 0, $errno, $errfile, $errline);
+	// Don't execute PHP internal error handler.
+	return true;
+});
+
+
+// Make our tmpdir.
+try {
+	mkdir($TMPDIR, $mode=0777, $recursive=true);
+} catch (Exception $ex) { }
+// Build an index of the programs we can use.
+$programs = array_values(array_filter(scandir("./programs"), function($d) {
+	return $d[0] != ".";
+}));
+
+if (!file_exists($FIFO)) {
+	posix_mkfifo($FIFO, 0777);
+}
+
+
+if ($_SERVER['REQUEST_METHOD'] === 'POST') {
+	$program = $_POST["program"] ?? $programs[0];
+
+	// Ok, let's add a bit of security and make sure that the program is known
+	// in our program index.
+	if (!in_array($program, $programs)) {
+		die("no hax, pl0x");
+	}
+
+	try {
+		$pid = file_get_contents($PIDFILE);
+		posix_kill($pid, SIGKILL);
+		// Let ledcat timeout so it clears its input buffers.
+		sleep(1);
+	} catch (Exception $ex) { }
+
+	$pid = shell_exec("$PROGDIR/$program > $FIFO & echo $!");
+	file_put_contents($PIDFILE, $pid);
+
+	echo "Started $program";
+}
+?>
+
+<form method="post">
+<?php
+	foreach ($programs as $program) {
+		echo "<input type=\"radio\" name=\"program\" value=\"$program\">$program<br>\n";
+	}
+?>
+	<input type="submit" value="Ok" />
+</form>

programs/blue.py

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+#!/usr/bin/env python3
+
+import sys
+
+while True:
+    sys.stdout.buffer.write(b"\x00\x00\xff")

programs/red.py

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+#!/usr/bin/env python3
+
+import sys
+
+while True:
+    sys.stdout.buffer.write(b"\xff\x00\x00")