From cad8dd686e5062ce9507c617efb90a3b37d9041d Mon Sep 17 00:00:00 2001
From: tigerbot <seth.gibelyou@daplie.com>
Date: Fri, 9 Jun 2017 12:14:25 -0600
Subject: [PATCH] changed UDP servers to reuseAddr

---
 bin/goldilocks.js  | 38 ++++----------------------------------
 lib/check-ports.js | 41 -----------------------------------------
 lib/servers.js     |  2 +-
 3 files changed, 5 insertions(+), 76 deletions(-)

diff --git a/bin/goldilocks.js b/bin/goldilocks.js
index 173c951..a995608 100755
--- a/bin/goldilocks.js
+++ b/bin/goldilocks.js
@@ -141,7 +141,7 @@ function fillConfig(config, args) {
   config.debug = config.debug || args.debug;
 
   if (!config.dns) {
-    config.dns = { modules: [{ name: 'proxy', port: 3053 }] };
+    config.dns = { bind: [ 53 ], modules: [{ name: 'proxy', port: 3053 }] };
   }
   // Use Object.assign to add any properties needed but not defined in the mdns config.
   // It will first copy the defaults into an empty object, then copy any real config over that.
@@ -203,8 +203,7 @@ function fillConfig(config, args) {
 
   config.tunnel = args.tunnel || config.tunnel;
 
-  var tcpProm, dnsProm;
-
+  var tcpProm;
   if (config.tcp.bind) {
     tcpProm = PromiseA.resolve();
   } else {
@@ -220,42 +219,13 @@ function fillConfig(config, args) {
     });
   }
 
-  if (config.dns.bind) {
-    dnsProm = PromiseA.resolve();
-  } else {
-    dnsProm = new PromiseA(function (resolve) {
-      require('../lib/check-ports').checkUdpPorts(function (failed, bound) {
-        var ports = Object.keys(bound);
-
-        if (ports.length === 0) {
-          // I don't think we want to prevent the rest of the app from running in
-          // this case like we do for TCP, so don't call reject.
-          console.warn('could not bind to the desired ports for DNS');
-          Object.keys(failed).forEach(function (key) {
-            console.log('[error bind]', key, failed[key].code);
-          });
-        }
-        else if (ports.length === 1) {
-          config.dns.bind = parseInt(ports[0], 10);
-        }
-        else {
-          config.dns.bind = ports.map(function (numStr) {
-            return parseInt(numStr, 10);
-          });
-        }
-
-        resolve();
-      });
-    });
-  }
-
-  return PromiseA.all([tcpProm, dnsProm])
+  return tcpProm
     .then(function () { return config; })
     .catch(function (failed) {
       Object.keys(failed).forEach(function (key) {
         console.log('[error bind]', key, failed[key].code);
       });
-      return PromiseA.reject(new Error("could not bind to the desired ports"));
+      return PromiseA.reject(new Error("could not bind to the default ports"));
     });
 }
 
diff --git a/lib/check-ports.js b/lib/check-ports.js
index f6e6a8e..f137d88 100644
--- a/lib/check-ports.js
+++ b/lib/check-ports.js
@@ -11,17 +11,6 @@ function bindTcpAndRelease(port, cb) {
   });
 }
 
-function bindUdpAndRelease(port, cb) {
-  var socket = require('dgram').createSocket('udp4');
-  socket.on('error', function (e) {
-    cb(e);
-  });
-  socket.bind(port, function () {
-    socket.close();
-    cb();
-  });
-}
-
 function checkTcpPorts(cb) {
   var bound = {};
   var failed = {};
@@ -62,34 +51,4 @@ function checkTcpPorts(cb) {
   });
 }
 
-function checkUdpPorts(cb) {
-  var bound = {};
-  var failed = {};
-
-  bindUdpAndRelease(53, function (e) {
-    if (e) {
-      failed[53] = e;
-    } else {
-      bound[53] = true;
-    }
-
-    if (bound[53]) {
-      cb(null, bound);
-      return;
-    }
-
-    console.warn("default DNS port 53 not available, trying 8053");
-    bindUdpAndRelease(8053, function (e) {
-      if (e) {
-        failed[8053] = e;
-      } else {
-        bound[8053] = true;
-      }
-
-      cb(failed, bound);
-    });
-  });
-}
-
 module.exports.checkTcpPorts = checkTcpPorts;
-module.exports.checkUdpPorts = checkUdpPorts;
diff --git a/lib/servers.js b/lib/servers.js
index c4000a5..0338172 100644
--- a/lib/servers.js
+++ b/lib/servers.js
@@ -111,7 +111,7 @@ module.exports.addUdpListener = function (port, handler) {
     }
 
     var dgram = require('dgram');
-    var server = dgram.createSocket('udp4');
+    var server = dgram.createSocket({type: 'udp4', reuseAddr: true});
     var resolved = false;
 
     stat = dgramMap[port] = {