Add rules compiler script.

rule-compiler/README.md

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+ZeroTier Rules Compiler
+======
+
+This script converts ZeroTier rules in human-readable format into rules suitable for import into a ZeroTier network controller. It's the script that is used in the rules editor on [ZeroTier Central](https://my.zerotier.com/).
+

rule-compiler/cli.js

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+'use strict';
+
+var fs = require('fs');
+
+var RuleCompiler = require('./rule-compiler.js');
+
+if (process.argv.length < 3) {
+	console.log('Usage: node cli.js <rules script>');
+	process.exit(1);
+}
+
+var src = fs.readFileSync(process.argv[2]).toString();
+
+var rules = [];
+var caps = {};
+var tags = {};
+var err = RuleCompiler.compile(src,rules,caps,tags);
+
+if (err) {
+	console.log('ERROR parsing '+process.argv[2]+' line '+err[0]+' column '+err[1]+': '+err[2]);
+	process.exit(1);
+} else {
+	console.log(JSON.stringify({
+		rules: rules,
+		caps: caps,
+		tags: tags
+	},null,2));
+	process.exit(0);
+}

rule-compiler/examples/capabilities-and-tags.ztrules

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+# This is a default rule set that allows IPv4 and IPv6 traffic.
+# You can edit as needed. If your rule set gets large we recommend
+# cutting and pasting it somewhere to keep a backup.
+
+# Drop all Ethernet frame types that are not IPv4 or IPv6
+drop
+	not ethertype 0x0800 # IPv4
+	not ethertype 0x0806 # IPv4 ARP
+	not ethertype 0x86dd # IPv6
+;
+
+# Capability: outgoing SSH
+cap ssh
+	id 1000
+	accept
+		ipprotocol tcp
+		dport 22
+	;
+;
+
+# A tag indicating which department people belong to
+tag department
+	id 1000
+	enum 100 sales
+	enum 200 marketing
+	enum 300 accounting
+	enum 400 engineering
+;
+
+# Accept all traffic between members of the same department
+accept
+	tdiff department 0
+;
+
+# You can insert other drop, tee, etc. rules here. This rule
+# set ends with a blanket accept, making it permissive by
+# default.
+
+accept;
+

rule-compiler/package.json

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+{
+  "name": "zerotier-rule-compiler",
+  "version": "1.1.17",
+  "description": "ZeroTier Rule Script Compiler",
+  "main": "cli.js",
+  "scripts": {
+    "test": "echo \"Error: no test specified\" && exit 1"
+  },
+  "repository": {
+    "type": "git",
+    "url": "https://github.com/zerotier/ZeroTierOne/rule-compiler"
+  },
+  "keywords": [
+    "ZeroTier"
+  ],
+  "author": "ZeroTier, Inc. <[email protected]>",
+  "license": "GPL-2.0"
+}