jakebathman · January 16, 2021 05:39 · Jan 16, 2021
diff --git a/interview.php b/interview.php
@@ -0,0 +1,52 @@
+<?php
+
+$host = 'palindromer-bd7e0fc867d57915.elb.us-east-1.amazonaws.com';
+$port = 7777;
+
+$socket = fsockopen($host, $port);
+
+if (! $socket) {
+    die('Error: connection not successful');
+}
+
+echo 'Processing lines ';
+
+while ($line = fgets($socket)) {
+    echo '.';
+
+    // Divide the string into word chunks along spaces
+    $words = explode(' ', $line);
+
+    // Check for special line, denoting flag
+    if (stripos($line, '!!!') === 0) {
+        if (preg_match('/!!! flag\[(.*?)\]/i', $line, $matches)) {
+            $response = $matches[1] . "\n";
+
+            echo "\n\nFlag received: {$response}";
+            fputs($socket, $response);
+
+            return fclose($socket);
+        }
+    }
+
+    // Get the palindromes
+    $return = [];
+    foreach ($words as $word) {
+        if (isPalindromic($word)) {
+            $return[] = $word;
+        }
+    }
+
+    // Must respond with newline at the end
+    $response = trim(implode(' ', $return)) . "\n";
+
+    // Send response string
+    fputs($socket, $response);
+}
+
+function isPalindromic($word)
+{
+    $word = trim($word);
+
+    return $word == strrev($word);
+}