added option to specify port range for client ports

bin/server

@@ -11,7 +11,7 @@ import CreateServer from '../server';
 const debug = Debug('localtunnel');
 
 const argv = optimist
-    .usage('Usage: $0 --port [num]')
+    .usage('Usage: $0 [--port num] [--address address] [--domain domain] [--max-sockets 10] [--client-min-port-range 3000 --client-max-port-range 3500]')
     .options('secure', {
         default: false,
         describe: 'use this flag to indicate proxy over https'
@@ -31,6 +31,14 @@ const argv = optimist
         default: 10,
         describe: 'maximum number of tcp sockets each client is allowed to establish at one time (the tunnels)'
     })
+    .options('client-min-port-range', {
+        default: 1024,
+        describe: 'Port start range to use for localtunnel clients to connect to'
+    })
+    .options('client-max-port-range', {
+        default: 65535,
+        describe: 'Port end range to use for localtunnel clients to connect to'
+    })
     .argv;
 
 if (argv.help) {
@@ -42,6 +50,8 @@ const server = CreateServer({
     max_tcp_sockets: argv['max-sockets'],
     secure: argv.secure,
     domain: argv.domain,
+    client_min_port_range: argv['client-min-port-range'],
+    client_max_port_range: argv['client-max-port-range']
 });
 
 server.listen(argv.port, argv.address, () => {

lib/ClientManager.js

@@ -38,9 +38,13 @@ class ClientManager {
         }
 
         const maxSockets = this.opt.max_tcp_sockets;
+        const client_min_port_range = this.opt.client_min_port_range;
+        const client_max_port_range = this.opt.client_max_port_range;
         const agent = new TunnelAgent({
             clientId: id,
-            maxSockets: 10,
+            maxSockets: maxSockets,
+            client_min_port_range: client_min_port_range,
+            client_max_port_range: client_max_port_range
         });
 
         const client = new Client({

lib/TunnelAgent.js

@@ -4,8 +4,12 @@ import assert from 'assert';
 import log from 'book';
 import Debug from 'debug';
 
+import { getPort } from 'portfinder';
 const DEFAULT_MAX_SOCKETS = 10;
 
+const DEFAULT_MIN_PORT_RANGE = 1024;
+const DEFAULT_MAX_PORT_RANGE = 65535;
+
 // Implements an http.Agent interface to a pool of tunnel sockets
 // A tunnel socket is a connection _from_ a client that will
 // service http requests. This agent is usable wherever one can use an http.Agent
@@ -31,6 +35,9 @@ class TunnelAgent extends Agent {
         this.connectedSockets = 0;
         this.maxTcpSockets = options.maxTcpSockets || DEFAULT_MAX_SOCKETS;
 
+        this.client_min_port_range = options.client_min_port_range || DEFAULT_MIN_PORT_RANGE;
+        this.client_max_port_range = options.client_max_port_range || DEFAULT_MAX_PORT_RANGE;
+
         // new tcp server to service requests for this client
         this.server = net.createServer();
 
@@ -63,14 +70,19 @@ class TunnelAgent extends Agent {
         });
 
         return new Promise((resolve) => {
-            server.listen(() => {
-                const port = server.address().port;
-                this.debug('tcp server listening on port: %d', port);
-
-                resolve({
-                    // port for lt client tcp connections
-                    port: port,
-                });
+            getPort({
+              port: this.client_min_port_range,    // minimum port
+              stopPort: this.client_max_port_range // maximum port
+            }, (err,port) => {
+              server.listen(port,() => {
+                  const port = server.address().port;
+                  this.debug('tcp server listening on port: %d', port);
+
+                  resolve({
+                      // port for lt client tcp connections
+                      port: port,
+                  });
+              });
             });
         });
     }

package.json

@@ -18,7 +18,8 @@
     "localenv": "0.2.2",
     "optimist": "0.6.1",
     "pump": "3.0.0",
-    "tldjs": "2.3.1"
+    "tldjs": "2.3.1",
+    "portfinder": "1.0.20"
   },
   "devDependencies": {
     "mocha": "5.1.1",

yarn.lock

@@ -33,6 +33,10 @@ async-limiter@~1.0.0:
   version "1.0.0"
   resolved "https://registry.yarnpkg.com/async-limiter/-/async-limiter-1.0.0.tgz#78faed8c3d074ab81f22b4e985d79e8738f720f8"
 
+async@^1.5.2:
+  version "1.5.2"
+  resolved "https://registry.yarnpkg.com/async/-/async-1.5.2.tgz#ec6a61ae56480c0c3cb241c95618e20892f9672a"
+
 asynckit@^0.4.0:
   version "0.4.0"
   resolved "https://registry.yarnpkg.com/asynckit/-/asynckit-0.4.0.tgz#c79ed97f7f34cb8f2ba1bc9790bcc366474b4b79"
@@ -179,6 +183,12 @@ debug@*, [email protected], debug@^3.1.0:
   dependencies:
     ms "2.0.0"
 
+debug@^2.2.0:
+  version "2.6.9"
+  resolved "https://registry.yarnpkg.com/debug/-/debug-2.6.9.tgz#5d128515df134ff327e90a4c93f4e077a536341f"
+  dependencies:
+    ms "2.0.0"
+
 decamelize@^1.1.2:
   version "1.2.0"
   resolved "https://registry.yarnpkg.com/decamelize/-/decamelize-1.2.0.tgz#f6534d15148269b20352e7bee26f501f9a191290"
@@ -666,7 +676,7 @@ minimist@~0.0.1:
   version "0.0.10"
   resolved "https://registry.yarnpkg.com/minimist/-/minimist-0.0.10.tgz#de3f98543dbf96082be48ad1a0c7cda836301dcf"
 
-[email protected]:
+[email protected], [email protected]:
   version "0.5.1"
   resolved "https://registry.yarnpkg.com/mkdirp/-/mkdirp-0.5.1.tgz#30057438eac6cf7f8c4767f38648d6697d75c903"
   dependencies:
@@ -825,6 +835,14 @@ pinkie@^2.0.0:
   version "2.0.4"
   resolved "https://registry.yarnpkg.com/pinkie/-/pinkie-2.0.4.tgz#72556b80cfa0d48a974e80e77248e80ed4f7f870"
 
+[email protected]:
+  version "1.0.20"
+  resolved "https://registry.yarnpkg.com/portfinder/-/portfinder-1.0.20.tgz#bea68632e54b2e13ab7b0c4775e9b41bf270e44a"
+  dependencies:
+    async "^1.5.2"
+    debug "^2.2.0"
+    mkdirp "0.5.x"
+
 process-nextick-args@~2.0.0:
   version "2.0.0"
   resolved "https://registry.yarnpkg.com/process-nextick-args/-/process-nextick-args-2.0.0.tgz#a37d732f4271b4ab1ad070d35508e8290788ffaa"