Add simple root server watcher (for our own new dashboard, but also for user use).

.gitignore

@@ -78,6 +78,7 @@ debian/zerotier-one
 debian/zerotier-one*.debhelper
 debian/*.log
 debian/zerotier-one.substvars
+root-watcher/config.json
 
 # Java/Android/JNI build droppings
 java/obj/

root-watcher/README.md

@@ -0,0 +1,8 @@
+Root Server Watcher
+======
+
+This is a small daemon written in NodeJS that watches a set of root servers and records peer status information into a Postgres database.
+
+To use type `npm install` to install modules. Then edit `config.json.example` and rename to `config.json`. For each of your roots you will need to configure a way for this script to reach it. You will also need to use `schema.sql` to initialize a Postgres database to contain your logs and set it up in `config.json` as well.
+
+This doesn't (yet) include any software for reading the log database and doing anything useful with the information inside, though given that it's a simple SQL database it should not be hard to compose queries to show interesting statistics.

root-watcher/config.json.example

@@ -0,0 +1,30 @@
+{
+	"interval": 30000,
+	"dbSaveInterval": 60000,
+	"peerTimeout": 600000,
+	"db": {
+		"database": "ztr",
+		"user": "postgres",
+		"password": "s00p3rs3kr3t",
+		"host": "127.0.0.1",
+		"port": 5432,
+		"max": 16,
+		"idleTimeoutMillis": 30000
+	},
+	"roots": {
+		"my-root-01": {
+			"id": 1,
+			"ip": "10.0.0.1",
+			"port": 9993,
+			"authToken": "foobarbaz",
+			"peers": "/peer"
+		},
+		"my-root-02": {
+			"id": 2,
+			"ip": "10.0.0.2",
+			"port": 9993,
+			"authToken": "lalafoo",
+			"peers": "/peer"
+		}
+	}
+}

root-watcher/package.json

@@ -9,6 +9,8 @@
   "author": "ZeroTier, Inc. <contact@zerotier.com>",
   "license": "GPL-3.0",
   "dependencies": {
-    "pg": "^6.1.5"
+    "async": "^2.3.0",
+    "pg": "^6.1.5",
+    "zlib": "^1.0.5"
   }
 }

root-watcher/schema.sql

@@ -0,0 +1,21 @@
+/* Schema for ZeroTier root watcher log database */
+
+/* If you cluster this DB using any PG clustering scheme that uses logs, you must remove UNLOGGED here! */
+CREATE UNLOGGED TABLE "Peer"
+(
+	"ztAddress" BIGINT NOT NULL,
+	"timestamp" BIGINT NOT NULL,
+	"versionMajor" INTEGER NOT NULL,
+	"versionMinor" INTEGER NOT NULL,
+	"versionRev" INTEGER NOT NULL,
+	"rootId" INTEGER NOT NULL,
+	"phyPort" INTEGER NOT NULL,
+	"phyLinkQuality" REAL NOT NULL,
+	"phyLastReceive" BIGINT NOT NULL,
+	"phyAddress" INET NOT NULL
+);
+
+CREATE INDEX "Peer_ztAddress" ON "Peer" ("ztAddress");
+CREATE INDEX "Peer_timestamp" ON "Peer" ("timestamp");
+CREATE INDEX "Peer_rootId" ON "Peer" ("rootId");
+CREATE INDEX "Peer_phyAddress" ON "Peer" ("phyAddress");

root-watcher/zerotier-root-watcher.js

@@ -2,4 +2,234 @@
 
 const pg = require('pg');
 const zlib = require('zlib');
+const http = require('http');
+const fs = require('fs');
+const async = require('async');
 
+const config = JSON.parse(fs.readFileSync('./config.json'));
+const roots = config.roots||{};
+
+const db = new pg.Pool(config.db);
+
+process.on('uncaughtException',function(err) {
+	console.error('ERROR: uncaught exception: '+err);
+	if (err.stack)
+		console.error(err.stack);
+});
+
+function httpRequest(host,port,authToken,method,path,args,callback)
+{
+	var responseBody = [];
+	var postData = (args) ? JSON.stringify(args) : null;
+
+	var req = http.request({
+		host: host,
+		port: port,
+		path: path,
+		method: method,
+		headers: {
+			'X-ZT1-Auth': (authToken||''),
+			'Content-Length': (postData) ? postData.length : 0
+		}
+	},function(res) {
+		res.on('data',function(chunk) {
+			if ((chunk)&&(chunk.length > 0))
+				responseBody.push(chunk);
+		});
+		res.on('timeout',function() {
+			try {
+				if (typeof callback === 'function') {
+					var cb = callback;
+					callback = null;
+					cb(new Error('connection timed out'),null);
+				}
+				req.abort();
+			} catch (e) {}
+		});
+		res.on('error',function(e) {
+			try {
+				if (typeof callback === 'function') {
+					var cb = callback;
+					callback = null;
+					cb(new Error('connection timed out'),null);
+				}
+				req.abort();
+			} catch (e) {}
+		});
+		res.on('end',function() {
+			if (typeof callback === 'function') {
+				var cb = callback;
+				callback = null;
+				if (responseBody.length === 0) {
+					return cb(null,{});
+				} else {
+					responseBody = Buffer.concat(responseBody);
+
+					if (responseBody.length < 2) {
+						return cb(null,{});
+					}
+
+					if ((responseBody.readUInt8(0,true) === 0x1f)&&(responseBody.readUInt8(1,true) === 0x8b)) {
+						try {
+							responseBody = zlib.gunzipSync(responseBody);
+						} catch (e) {
+							return cb(e,null);
+						}
+					}
+
+					try {
+						return cb(null,JSON.parse(responseBody));
+					} catch (e) { 
+						return cb(e,null);
+					}
+				}
+			}
+		});
+	}).on('error',function(e) {
+		try {
+			if (typeof callback === 'function') {
+				var cb = callback;
+				callback = null;
+				cb(e,null);
+			}
+			req.abort();
+		} catch (e) {}
+	}).on('timeout',function() {
+		try {
+			if (typeof callback === 'function') {
+				var cb = callback;
+				callback = null;
+				cb(new Error('connection timed out'),null);
+			}
+			req.abort();
+		} catch (e) {}
+	});
+
+	req.setTimeout(30000);
+	req.setNoDelay(true);
+
+	if (postData !== null)
+		req.end(postData);
+	else req.end();
+};
+
+var peerStatus = {};
+
+function saveToDb()
+{
+	db.connect(function(err,client,clientDone) {
+		if (err) {
+			console.log('WARNING: database error writing peers: '+err.toString());
+			clientDone();
+			return setTimeout(saveToDb,config.dbSaveInterval||60000);
+		}
+		client.query('BEGIN',function(err) {
+			if (err) {
+				console.log('WARNING: database error writing peers: '+err.toString());
+				clientDone();
+				return setTimeout(saveToDb,config.dbSaveInterval||60000);
+			}
+			let timeout = Date.now() - (config.peerTimeout||600000);
+			let wtotal = 0;
+			async.eachSeries(Object.keys(peerStatus),function(address,nextAddress) {
+				let s = peerStatus[address];
+				if (s[1] <= timeout) {
+					delete peerStatus[address];
+					return process.nextTick(nextAddress);
+				} else {
+					++wtotal;
+					client.query('INSERT INTO "Peer" ("ztAddress","timestamp","versionMajor","versionMinor","versionRev","rootId","phyPort","phyLinkQuality","phyLastReceive","phyAddress") VALUES ($1,$2,$3,$4,$5,$6,$7,$8,$9,$10)',s,nextAddress);
+				}
+			},function(err) {
+				if (err)
+					console.log('WARNING database error writing peers: '+err.toString());
+				console.log(Date.now().toString()+' '+wtotal);
+				client.query('COMMIT',function(err,result) {
+					clientDone();
+					return setTimeout(saveToDb,config.dbSaveInterval||60000);
+				});
+			});
+		});
+	});
+};
+
+function doRootUpdate(name,id,ip,port,peersPath,authToken,interval)
+{
+	httpRequest(ip,port,authToken,"GET",peersPath,null,function(err,res) {
+		if (err) {
+			console.log('WARNING: cannot reach '+name+peersPath+' (will try again in 1s): '+err.toString());
+			return setTimeout(function() { doRootUpdate(name,id,ip,port,peersPath,authToken,interval); },1000);
+		}
+		if (!Array.isArray(res)) {
+			console.log('WARNING: cannot reach '+name+peersPath+' (will try again in 1s): response is not an array of peers');
+			return setTimeout(function() { doRootUpdate(name,id,ip,port,peersPath,authToken,interval); },1000);
+		}
+
+		//console.log(name+': '+res.length+' peer entries.');
+		let now = Date.now();
+		let count = 0;
+		for(let pi=0;pi<res.length;++pi) {
+			let peer = res[pi];
+			let address = peer.address;
+			let ztAddress = parseInt(address,16)||0;
+			if (!ztAddress)
+				continue;
+
+			let paths = peer.paths;
+			if ((Array.isArray(paths))&&(paths.length > 0)) {
+				let bestPath = null;
+				for(let i=0;i<paths.length;++i) {
+					if (paths[i].active) {
+						let lr = paths[i].lastReceive;
+						if ((lr > 0)&&((!bestPath)||(bestPath.lastReceive < lr)))
+							bestPath = paths[i];
+					}
+				}
+
+				if (bestPath) {
+					let a = bestPath.address;
+					if (typeof a === 'string') {
+						let a2 = a.split('/');
+						if (a2.length === 2) {
+							let vmaj = peer.versionMajor;
+							if ((typeof vmaj === 'undefined')||(vmaj === null)) vmaj = -1;
+							let vmin = peer.versionMinor;
+							if ((typeof vmin === 'undefined')||(vmin === null)) vmin = -1;
+							let vrev = peer.versionRev;
+							if ((typeof vrev === 'undefined')||(vrev === null)) vrev = -1;
+							let lr = parseInt(bestPath.lastReceive)||0;
+
+							let s = peerStatus[address];
+							if ((!s)||(s[8] < lr)) {
+								peerStatus[address] = [
+									ztAddress,
+									now,
+									vmaj,
+									vmin,
+									vrev,
+									id,
+									parseInt(a2[1])||0,
+									parseFloat(bestPath.linkQuality)||1.0,
+									lr,
+									a2[0]
+								];
+							}
+							++count;
+						}
+					}
+				}
+			}
+		}
+
+		console.log(name+': '+count+' peers with active direct paths.');
+		return setTimeout(function() { doRootUpdate(name,id,ip,port,peersPath,authToken,interval); },interval);
+	});
+};
+
+for(var r in roots) {
+	var rr = roots[r];
+	if (rr.peers)
+		doRootUpdate(r,rr.id,rr.ip,rr.port,rr.peers,rr.authToken||null,config.interval||60000);
+}
+
+return setTimeout(saveToDb,config.dbSaveInterval||60000);