From 65e7041a3c88a5b2d1ae76e7023807537775cb1b Mon Sep 17 00:00:00 2001
From: Yuval Adam <_@yuv.al>
Date: Sat, 21 Sep 2024 13:15:44 +0200
Subject: Initial NextJS project creation with basic structure

---
 app/page.tsx | 107 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 107 insertions(+)
 create mode 100644 app/page.tsx

(limited to 'app/page.tsx')

diff --git a/app/page.tsx b/app/page.tsx
new file mode 100644
index 0000000..091d2f6
--- /dev/null
+++ b/app/page.tsx
@@ -0,0 +1,107 @@
+"use client"
+
+import React, { useState } from 'react';
+import { Netmask } from 'netmask';
+
+export default function Cidr() {
+  const [ip, setIp] = useState([10, 88, 135, 144]);
+  const [cidr, setCidr] = useState(28);
+  const [cols, _setCols] = useState(["bg-purple-400", "bg-red-400", "bg-green-400", "bg-yellow-400"]);
+
+  const bits = ip.map(octet => Array.from({ length: 8 }, (_, i) => (octet >> (7 - i)) & 1));
+
+  const parseOctet = (val: string, max: number) => {
+    const num = parseInt(val);
+    if (isNaN(num) || num < 0) return 0;
+    if (num > max) return max;
+    return num;
+  }
+
+  const setIpOctet = (i: number, val: number) => {
+    const newIp = [...ip];
+    newIp[i] = val;
+    setIp(newIp);
+  }
+
+  // const handleChange(event) {
+  //   var octets = this.state.octets;
+  //   var val = +event.target.value.replace(/[^0-9]/g, '');
+  //   var octet = event.target.attributes['data-octet'].value;
+  //   if (octet == 'cidr') {
+  //     if (val <= 32) {
+  //       this.setState({
+  //         cidr: val
+  //       });
+  //     }
+  //   } else {
+  //     if (val <= 255) {
+  //       octets[+octet] = val;
+  //       this.setState({
+  //         octets: octets
+  //       });
+  //     }
+  //   }
+  // }
+
+  return (
+    <div className="min-h-screen flex flex-col items-center justify-center bg-gray-100 p-4">
+      <div className="max-w-5xl w-full p-8">
+        <h1 className="text-4xl font-bold text-center mb-4">CIDR / IP Visualizer</h1>
+        <p className="text-sm text-left text-gray-600 mb-8">
+          <a href="https://en.wikipedia.org/wiki/Classless_Inter-Domain_Routing">CIDR</a> is a notation for describing
+          blocks of IP addresses and is used heavily in various networking configurations. IP addresses contain 4
+          octets, each consisting of 8 bits giving values between 0 and 255. The decimal value that comes after the
+          slash is the number of bits consisting of the routing prefix. This in turn can be translated into a netmask,
+          and also designates how many available addresses are in the block.
+        </p>
+
+        <div className="flex flex-wrap justify-center gap-4 mb-8">
+          {ip.map((octet, i) => (
+            <div key={`octet-${i}`}>
+              <input
+                key={`inp-${i}`}
+                type="text"
+                value={octet}
+                onChange={(e) => setIpOctet(i, parseOctet(e.target.value, 255))}
+                className={`w-20 h-20 text-3xl text-center rounded-md ${cols[i]}`}
+                maxLength={3}
+              />
+              <span className="text-5xl pl-4" key={`sep-${i}`}>{i == 3 ? "/" : "."}</span>
+            </div>
+          ))}
+          <input
+            type="text"
+            key={`inp-cidr`}
+            value={cidr}
+            onChange={(e) => setCidr(parseOctet(e.target.value, 32))}
+            className="w-20 h-20 text-3xl text-center rounded-md bg-slate-300"
+            maxLength={2}
+          />
+        </div>
+
+        <div className="text-center text-xl mb-8">
+          <div className="bits text-xs">
+            {bits.map((octet, i) => <span key={`octet-${i}`} className="px-4">
+              {octet.map((bit, j) => <span key={`octet-${i}-bit-${j}`} className={`font-mono border-y ${j == 0 && "border-l"} border-r border-gray-700 px-2 py-1 ${cols[i]}`}>{bit}</span>)}
+            </span>)}
+          </div>
+        </div>
+
+        <div className="text-center text-xl mb-8">
+          <span className="font-semibold">IP Address: </span>
+          {ip.join('.')}
+          <span className="font-semibold ml-4">CIDR: </span>/{cidr}
+        </div>
+
+        <footer className="flex justify-center space-x-4">
+          <a href="#" className="flex items-center text-blue-600 hover:underline">
+            GitHub
+          </a>
+          <a href="#" className="flex items-center text-blue-600 hover:underline">
+            About
+          </a>
+        </footer>
+      </div>
+    </div >
+  );
+}
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