Adds a lambda function for port scanning

netlify.toml

@@ -71,6 +71,11 @@
   to = "/.netlify/functions/server-status"
   status = 301
   force = true  
+[[redirects]]
+  from = "/check-ports"
+  to = "/.netlify/functions/check-ports"
+  status = 301
+  force = true
   
 # For router history mode, ensure pages land on index
 [[redirects]]

server/lambda/check-ports.js

@@ -0,0 +1,82 @@
+const net = require('net');
+
+// A list of commonly used ports.
+const PORTS = [21, 22, 25, 80, 110, 143, 443, 587, 993, 995, 3306, 3389, 5900, 8080];
+
+async function checkPort(port, domain) {
+    return new Promise(resolve => {
+        const socket = new net.Socket();
+        console.log(port, 'Init');
+
+        socket.setTimeout(1500); // you may want to adjust the timeout
+
+        socket.once('connect', () => {
+            console.log(port, 'Connected!');
+            socket.destroy();
+            resolve(port);
+        });
+
+        socket.once('timeout', () => {
+          console.log(port, 'Timedout');  
+          socket.destroy();
+        });
+
+        socket.once('error', (e) => {
+          console.log(port, 'Errored', e);
+            socket.destroy();
+        });
+
+        console.log(port, 'End');
+        socket.connect(port, domain);
+    });
+}
+
+exports.handler = async (event, context) => {
+  const domain = event.queryStringParameters.url;
+  if (!domain) {
+    return {
+      statusCode: 400,
+      body: JSON.stringify({ message: "Missing 'domain' parameter" }),
+    };
+  }
+
+  const delay = ms => new Promise(res => setTimeout(res, ms));
+  const timeout = delay(9000);
+
+  const openPorts = [];
+  const failedPorts = [];
+
+  const promises = PORTS.map(port => checkPort(port, domain)
+    .then(() => {
+      openPorts.push(port);
+      return { status: 'fulfilled', port };
+    })
+    .catch(() => {
+      failedPorts.push(port);
+      return { status: 'rejected', port };
+    }));
+
+  let timeoutReached = false;
+
+  for (const promise of promises) {
+    const result = await Promise.race([promise, timeout.then(() => ({ status: 'timeout', timeout: true }))]);
+    if (result.status === 'timeout') {
+      timeoutReached = true;
+      if (result.timeout) {
+        // Add the ports not checked yet to the failedPorts array
+        const checkedPorts = [...openPorts, ...failedPorts];
+        const portsNotChecked = PORTS.filter(port => !checkedPorts.includes(port));
+        failedPorts.push(...portsNotChecked);
+      }
+      break;
+    }
+  }
+
+  return {
+    statusCode: 200,
+    body: JSON.stringify({ timeout: timeoutReached, openPorts, failedPorts }),
+  };
+};
+
+
+