Add echoserver and sendmail

Author: linusjf

socket/echoserver.js

@@ -0,0 +1,17 @@
+#!/usr/bin/env node
+var net = require("net");
+var host = "0.0.0.0";
+var port = 5050;
+
+net.createServer(sock => {
+  console.log(`connected: ${sock.remoteAddress}:${sock.remotePort}`);
+  sock.on("data", (data) => {
+    console.log(`${sock.remoteAddress}: ${data}`);
+    sock.write(`${data}`);
+  });
+  sock.on("close", (_) => {
+    console.log(`connection closed: ${sock.remoteAddress}:${sock.remotePort}`);
+  });
+}).listen(port, host);
+
+console.log(`Server listening on ${host}:${port}`);

socket/sendmail.js

@@ -0,0 +1,34 @@
+#!/usr/bin/env node
+let net = require("net");
+
+let host = "192.168.0.23";
+let port = 25;
+
+let from = "[email protected]";
+let to = "root@core9";
+let name = "John Doe";
+let subject = "Hello";
+let body = "Hello there";
+
+let socket = new net.Socket();
+
+socket.connect(port, host, () => {
+
+  socket.write("HELO core9\n");
+  socket.write(`MAIL FROM: <${from}>\n`);
+  socket.write(`RCPT TO: <${to}>\n`);
+  socket.write("DATA\n");
+  socket.write(`From:${name}\n`);
+  socket.write(`Subject:${subject}\n`);
+  socket.write(`${body}`);
+  socket.write("\r\n.\r\n");
+  socket.write("QUIT\n");
+});
+
+socket.on("data", data => {
+  console.log(`${data}`);
+});
+
+socket.on("close", () => {
+  socket.destroy();
+});