From e1188e3178cf4b4432e2617dcee883775e4887da Mon Sep 17 00:00:00 2001
From: Kotschak <j.kotschak@zsi-tec.com>
Date: Thu, 13 Feb 2025 11:45:27 +0100
Subject: [PATCH] Add comments

---
 src/SSLCertChecker.java | 13 ++++++++++---
 1 file changed, 10 insertions(+), 3 deletions(-)

diff --git a/src/SSLCertChecker.java b/src/SSLCertChecker.java
index 10b20c4..92a4e6b 100644
--- a/src/SSLCertChecker.java
+++ b/src/SSLCertChecker.java
@@ -32,7 +32,7 @@ public class SSLCertChecker {
             }
         }
         catch (IOException e){
-            System.out.println("Error reading file");
+            System.out.println("Error reading file"+e.getMessage());
         }
     }
     public static void checkCert(String curl){
@@ -41,6 +41,8 @@ public class SSLCertChecker {
             HttpsURLConnection connection = (HttpsURLConnection) url.openConnection();
             connection.connect();
 
+            // Get the Cert Chain and check for every Certificate in the line
+            // First one is usually the own Cert, the ones after the CA
             Certificate[] certs = connection.getServerCertificates();
             for (Certificate cert : certs) {
                 if (cert instanceof X509Certificate) {
@@ -64,10 +66,15 @@ public class SSLCertChecker {
             System.out.println("Fehler beim Abrufen des Zertifikats: " + e.getMessage());
         }
     }
+    //
+    // first args needs to be a file with the domains listed. Every domain needs to have its own line
+    //
     public static void main(String[] args){
-        if(args.length <1)
+        if(args.length <1){
             System.out.println("Kein Url-File angegeben");
-        readUrls(args[0]);
+        }
+        else
+            readUrls(args[0]);
 
     }
 }