README.md

@@ -89,8 +89,6 @@ Options
 +time=<seconds>             Sets the timeout for a query in seconds.
 +norecurse                  Set `ra` flag to 0. Do not perform recursion.
 +aaonly                     Set `aa` flag to 1. Do not respond with non-authoritative responses.
-+notcp                      Disable TCP server (default in v1.2)
-+tcp                        Enable TCP server (default in v1.3)
 
 --debug                     verbose output
 ```

bin/digd.js

@@ -5,7 +5,9 @@
 var cli = require('cli');
 var pkg = require('../package.json');
 var dig = require('dig.js/dns-request');
+var dgram = require('dgram');
 var dnsjs = require('dns-suite');
+var crypto = require('crypto');
 var common = require('dig.js/common');
 var defaultNameservers = require('dns').getServers();
 var hexdump;
@@ -47,32 +49,8 @@ cli.main(function (args, cli) {
       cli.norecurse = true;
       return;
     }
-    if (arg === '+notcp') {
-      if (cli.notcp) {
-        console.error("'+notcp' was specified more than once");
-        process.exit(1);
-        return;
-      }
-      cli.notcp = true;
-      return;
-    }
-    if (arg === '+tcp') {
-      if (cli.tcp) {
-        console.error("'+tcp' was specified more than once");
-        process.exit(1);
-        return;
-      }
-      cli.tcp = true;
-      return;
-    }
   });
 
-  if (!cli.tcp) {
-    if (!cli.notcp) {
-      console.info("[WARNING] Set '+notcp' to disable tcp connections. The default behavior changes to +tcp in v1.3");
-    }
-  }
-
   if (cli.mdns) {
     if (!cli.type) {
       cli.type = cli.t = 'PTR';
@@ -95,10 +73,32 @@ cli.main(function (args, cli) {
     }
   }
 
-  var dnsd = {};
+  var handlers = {};
-  dnsd.onMessage = function (nb, cb) {
+  var server = dgram.createSocket({
-    var byteOffset = nb._dnsByteOffset || nb.byteOffset;
+    type: cli.udp6 ? 'udp6' : 'udp4'
-    var queryAb = nb.buffer.slice(byteOffset, byteOffset + nb.byteLength);
+  , reuseAddr: true
+  });
+  server.bind({
+    port: cli.port
+  , address: cli.address
+  });
+
+  handlers.onError = function (err) {
+    if ('EACCES' === err.code) {
+      console.error("");
+      console.error("EACCES: Couldn't bind to port. You probably need to use sudo, authbind, or setcap.");
+      console.error("");
+      process.exit(123);
+      return;
+    }
+    console.error("error:", err.stack);
+    server.close();
+  };
+
+  handlers.onMessage = function (nb, rinfo) {
+    console.log('[DEBUG] got a message');
+
+    var queryAb = nb.buffer.slice(nb.byteOffset, nb.byteOffset + nb.byteLength);
     var query;
     var count;
 
@@ -215,11 +215,12 @@ cli.main(function (args, cli) {
         console.error("Could not write empty DNS response");
         console.error(e);
         console.error(emptyResp);
-        cb(e, null, '[DEV] response sent (empty)');
         return;
       }
 
-      cb(null, newAb, '[DEV] response sent (empty)');
+      server.send(newAb, rinfo.port, rinfo.address, function () {
+        console.log('[DEV] response sent (empty)', rinfo.port, rinfo.address);
+      });
     }
 
     function sendResponse(newPacket) {
@@ -231,11 +232,12 @@ cli.main(function (args, cli) {
         console.error("Could not write DNS response from local");
         console.error(e);
         console.error(newPacket);
-        cb(e, null, '[DEV] response sent (local query)');
         return;
       }
 
-      cb(null, newAb, '[DEV] response sent (local query)');
+      server.send(newAb, rinfo.port, rinfo.address, function () {
+        console.log('[DEV] response sent (local query)', rinfo.port, rinfo.address);
+      });
     }
 
     function recurse() {
@@ -288,11 +290,12 @@ cli.main(function (args, cli) {
             } catch(e) {
               console.error("Could not write DNS response");
               console.error(newResponse);
-              cb(e, null, '[DEV] response sent');
               return;
             }
 
-            cb(null, newAb, '[DEV] response sent');
+            server.send(newAb, rinfo.port, rinfo.address, function () {
+              console.log('[DEV] response sent', rinfo.port, rinfo.address);
+            });
           }
         }
 
@@ -332,8 +335,7 @@ cli.main(function (args, cli) {
               console.log('request sent to', res.nameserver);
             }
             */
-            //console.log('[DEV] query sent (recurse)', rinfo.port, rinfo.address);
+            console.log('[DEV] query sent (recurse)', rinfo.port, rinfo.address);
-            //dnsd.onSent('[DEV] query sent (recurse)');
           }
         , onTimeout: function (res) {
             console.log(";; [" + q.name + "] connection timed out; no servers could be reached");
@@ -391,24 +393,32 @@ cli.main(function (args, cli) {
       return;
     }
     require('../lib/digd.js').query(engine, query, respondWithResults);
+
   };
 
-  cli.defaultNameservers = defaultNameservers;
+  handlers.onListening = function () {
-  require('../lib/udpd.js').create(cli, dnsd).on('listening', function () {
+    /*jshint validthis:true*/
+    var server = this;
     cli.chosenNameserver = cli.nameserver;
     var index;
 
     if (!cli.chosenNameserver) {
-      index = require('crypto').randomBytes(2).readUInt16BE(0) % cli.defaultNameservers.length;
+      index = crypto.randomBytes(2).readUInt16BE(0) % defaultNameservers.length;
-      cli.chosenNameserver = cli.defaultNameservers[index];
+      cli.chosenNameserver = defaultNameservers[index];
       if (cli.debug) {
-        console.log('index, defaultNameservers', index, cli.defaultNameservers);
+        console.log('index, defaultNameservers', index, defaultNameservers);
       }
     }
-  });
+
-  if (cli.tcp /* TODO v1.3 !cli.notcp */) {
+    if (cli.mdns || '224.0.0.251' === cli.nameserver) {
-    require('../lib/tcpd.js').create(cli, dnsd);
+      server.setBroadcast(true);
-  }
+      server.addMembership(cli.nameserver);
+    }
+
+    console.log('');
+    console.log('Bound and Listening:');
+    console.log(server.address().address + '#' + server.address().port + ' (' + server.type + ')');
+  };
 
   console.log('');
   if (!cli.nocmd) {
@@ -416,4 +426,7 @@ cli.main(function (args, cli) {
     console.log(';; global options: +cmd');
   }
 
+  server.on('error', handlers.onError);
+  server.on('message', handlers.onMessage);
+  server.on('listening', handlers.onListening);
 });

lib/tcpd.js

@@ -1,70 +0,0 @@
-'use strict';
-
-module.exports.create = function (cli, dnsd) {
-  function runTcp() {
-    var tcpServer = require('net').createServer({ }, function (c) {
-      c.on('error', function (err) {
-        console.warn("TCP Connection Error:");
-        console.warn(err);
-      });
-      c.on('data', function (nb) {
-        //console.log('TCP data.length:', nb.length);
-        //console.log(nb.toString('hex'));
-
-        // DNS packets include a 2-byte length header
-        var count = nb.length;
-        var length = nb[0] << 8;
-        length = length | nb[1];
-        count -= 2;
-        // TODO slice?
-        nb._dnsByteOffset = nb.byteOffset + 2;
-
-        if (length !== count) {
-          console.error("Handling TCP packets > 512 bytes not implemented.");
-          c.end();
-          return;
-        }
-
-        // TODO pad two bytes for lengths
-        dnsd.onMessage(nb, function (err, newAb, dbgmsg) {
-          var lenbuf = Buffer.from([ newAb.length >> 8, newAb.length & 255 ]);
-          // TODO XXX generate legit error packet
-          if (err) { console.error("Error", err); c.end(); return; }
-          console.log('TCP ' + dbgmsg);
-
-          c.write(lenbuf);
-          c.end(newAb);
-        });
-      });
-      c.on('end', function () {
-        console.log('TCP client disconnected from server');
-      });
-    });
-
-    tcpServer.on('error', function (err) {
-      if ('EADDRINUSE' === err.code) {
-        console.error("Port '" + cli.port + "' is already in use.");
-        tcpServer.close();
-        process.exit(0);
-      }
-      if ('EACCES' === err.code) {
-        console.error("Could not bind on port '" + cli.port + "': EACCESS (you probably need root permissions)");
-        tcpServer.close();
-        process.exit(0);
-      }
-      console.error("TCP Server Error:");
-      console.error(err);
-      tcpServer.close(function () {
-        setTimeout(runTcp, 1000);
-      });
-    });
-
-    tcpServer.listen(cli.port, function () {
-      console.log('TCP Server bound');
-    });
-
-    return tcpServer;
-  }
-
-  return runTcp();
-};

lib/udpd.js

@@ -1,58 +0,0 @@
-'use strict';
-
-module.exports.create = function (cli, dnsd) {
-  var server = require('dgram').createSocket({
-    type: cli.udp6 ? 'udp6' : 'udp4'
-  , reuseAddr: true
-  });
-  server.bind({
-    port: cli.port
-  , address: cli.address
-  });
-
-  var handlers = {};
-  handlers.onError = function (err) {
-    if ('EACCES' === err.code) {
-      console.error("");
-      console.error("EACCES: Couldn't bind to port. You probably need to use sudo, authbind, or setcap.");
-      console.error("");
-      process.exit(123);
-      return;
-    }
-    console.error("error:", err.stack);
-    server.close();
-  };
-
-  handlers.onMessage = function (nb, rinfo) {
-    //console.log('[DEBUG] got a UDP message', nb.length);
-    //console.log(nb.toString('hex'));
-
-    dnsd.onMessage(nb, function (err, newAb, dbgmsg) {
-      // TODO send legit error message
-      if (err) { server.send(Buffer.from([0x00])); return; }
-      server.send(newAb, rinfo.port, rinfo.address, function () {
-        console.log(dbgmsg, rinfo.port, rinfo.address);
-      });
-    });
-  };
-
-  handlers.onListening = function () {
-    /*jshint validthis:true*/
-    var server = this;
-
-    if (cli.mdns || '224.0.0.251' === cli.nameserver) {
-      server.setBroadcast(true);
-      server.addMembership(cli.nameserver);
-    }
-
-    console.log('');
-    console.log('Bound and Listening:');
-    console.log(server.address().address + '#' + server.address().port + ' (' + server.type + ')');
-  };
-
-  server.on('error', handlers.onError);
-  server.on('message', handlers.onMessage);
-  server.on('listening', handlers.onListening);
-
-  return server;
-};

package.json

@@ -1,6 +1,6 @@
 {
   "name": "digd.js",
-  "version": "1.2.1",
+  "version": "1.2.0",
   "description": "A lightweight DNS / mDNS daemon (server) for creating and capturing DNS and mDNS query and response packets to disk as binary and/or JSON. Options are similar to the Unix dig command.",
   "main": "bin/digd.js",
   "homepage": "https://git.coolaj86.com/coolaj86/digd.js",