Update src/index.php

src/index.php

@@ -1,12 +1,23 @@
 // src/index.php
 <?php
-echo '<h1>Hello World</h1><BR>';
-echo 'Version: 20240221-1537<BR>';
 
-// Creating a variable to store the 
-// server address 
-$ip_server = $_SERVER['SERVER_ADDR']; 
-  
-// Printing the stored address 
-echo "Server IP Address is: $ip_server"; 
+$gw = "Unknown";
+
+// Get the Docker host IP from the routing table
+$table = file("/proc/net/route");
+foreach ($table as $row) {
+    // Split the fields out of the routing table
+    $fields = preg_split("/[\t ]+/", trim($row));
+    
+    // Skip this route if it's not the default gateway
+    if ($fields[1] != "00000000") continue;
+
+    // Convert the hex gateway IP to dotted-notation
+    $gw_hex = $fields[2];
+    $gw_rev = long2ip(hexdec("0x$gw_hex"));
+    $gw = implode(".", array_reverse(explode(".", $gw_rev)));
+    break;
+}
+
+echo "Docker host IP: $gw\n";
 ?>