fix mdns

README.md

@@ -77,4 +77,6 @@ Options
 -c <class>                  default IN
 -p <port>                   default 53 (mdns default: 5353) (listener is random for DNS and 5353 for mDNS)
 -q <query> (superfluous)    required (ex: daplie.com)
+
++time=<seconds>             Sets the timeout for a query in seconds.
 ```

bin/dig.js

@@ -12,6 +12,7 @@ cli.parse({
 //, 'json': [ false, 'output results as json', 'string' ]
 //, 'lint': [ false, 'attack (in the metaphorical sense) a nameserver with all sorts of queries to test for correct responses', 'string', false ]
 , 'mdns': [ false, "Alias for setting defaults to -p 5353 @224.0.0.251 -t PTR -q _services._dns-sd._udp.local and waiting for multiple responses", 'boolean', false ]
+, 'timeout': [ false, "Alias for setting defaults to -p 5353 @224.0.0.251 -t PTR -q _services._dns-sd._udp.local and waiting for multiple responses", 'boolean', false ]
 , 'output': [ 'o', 'output prefix to use for writing query and response(s) to disk', 'file' ]
 , 'port': [ 'p', 'port (defaults to 53 for dns and 5353 for mdns)', 'int' ]
 //, 'serve': [ 's', 'path to json file with array of responses to issue for given queries', 'string' ]
@@ -257,7 +258,15 @@ function request(query, opts) {
   // 0 dns request
   // 53 dns server
   // 5353 mdns
-  server.bind(0);
+  if (opts.mdns) {
+    server.bind(5353);
+    setTimeout(function () {
+      server.close();
+    }, opts.timeout || (5 * 1000));
+  }
+  else {
+    server.bind(0);
+  }
 }
 
 cli.main(function (args, cli) {
@@ -271,6 +280,15 @@ cli.main(function (args, cli) {
       cli.type = cli.t = arg.toUpperCase();
     }
 
+    if (/^\+time=/.test(arg)) {
+      if (cli.timeout) {
+        console.error("'+time=' was specified more than once");
+        process.exit(1);
+        return;
+      }
+      cli.timeout = Math.round(parseInt(arg.replace(/\+time=/, ''), 10) * 1000);
+    }
+
     if (/^@/.test(arg)) {
       if (cli.nameserver) {
         console.error("'@server' was specified more than once");
@@ -299,6 +317,9 @@ cli.main(function (args, cli) {
     if (!cli.nameserver) {
       cli.nameserver = '224.0.0.251';
     }
+    if (!cli.query) {
+      cli.query = '_services._dns-sd._udp.local';
+    }
   }
 
   if (!cli.type) {