Make it possible for an attack to inject no packets

If there was only one attack, which returned that no packets were
injected, the program ran into an error. Now it does not and if
that scenario happens, it prints that no output files were created.

code/Core/Controller.py

@@ -105,61 +105,66 @@ class Controller:
                 os.remove(self.written_pcaps[i + 1])  # remove merged pcap
                 self.written_pcaps[i + 1] = attacks_pcap_path
             print("done.")
-        else:
+        elif len(self.written_pcaps) == 1:
             attacks_pcap_path = self.written_pcaps[0]
 
-        if inject_empty:
-            # copy the attack pcap to the directory of the base PCAP instead of merging them
-            print("Copying single attack pcap to location of base pcap...", end=" ")
-            sys.stdout.flush()  # force python to print text immediately
+        if attacks_pcap_path:
+            if inject_empty:
+                # copy the attack pcap to the directory of the base PCAP instead of merging them
+                print("Copying single attack pcap to location of base pcap...", end=" ")
+                sys.stdout.flush()  # force python to print text immediately
 
-            timestamp = '_' + time.strftime("%Y%m%d") + '-' + time.strftime("%X").replace(':', '')
-            self.pcap_dest_path = self.pcap_src_path.replace(".pcap", timestamp + '.pcap')
-            shutil.copy(attacks_pcap_path, self.pcap_dest_path)
-        else:
-            # merge single attack pcap with all attacks into base pcap
-            print("Merging base pcap with single attack pcap...", end=" ")
+                timestamp = '_' + time.strftime("%Y%m%d") + '-' + time.strftime("%X").replace(':', '')
+                self.pcap_dest_path = self.pcap_src_path.replace(".pcap", timestamp + '.pcap')
+                shutil.copy(attacks_pcap_path, self.pcap_dest_path)
+            else:
+                # merge single attack pcap with all attacks into base pcap
+                print("Merging base pcap with single attack pcap...", end=" ")
+                sys.stdout.flush()  # force python to print text immediately
+                self.pcap_dest_path = self.pcap_file.merge_attack(attacks_pcap_path)
+
+            if self.pcap_out_path:
+                if not self.pcap_out_path.endswith(".pcap"):
+                    self.pcap_out_path += ".pcap"
+                result_path = self.pcap_out_path
+            else:
+                tmp_path_tuple = self.pcap_dest_path.rpartition("/")
+                result_path = Util.OUT_DIR + tmp_path_tuple[2]
+
+            os.rename(self.pcap_dest_path, result_path)
+            self.pcap_dest_path = result_path
+            created_files = [self.pcap_dest_path]
+
+            # process/move other created files
+            pcap_root = os.path.splitext(self.pcap_dest_path)[0]
+            for k, v in Util.MISC_OUT_FILES.items():
+                if v is None:
+                    created_files.append(k)
+                else:
+                    outpath = pcap_root + "_" + k
+                    os.rename(v, outpath)
+                    created_files.append(outpath)
+
+            print("done.")
+
+            # delete intermediate PCAP files
+            print('Deleting intermediate attack pcap...', end=" ")
             sys.stdout.flush()  # force python to print text immediately
-            self.pcap_dest_path = self.pcap_file.merge_attack(attacks_pcap_path)
+            os.remove(attacks_pcap_path)
+            print("done.")
 
-        if self.pcap_out_path:
-            if not self.pcap_out_path.endswith(".pcap"):
-                self.pcap_out_path += ".pcap"
-            result_path = self.pcap_out_path
+            # write label file with attacks
+            self.label_manager.write_label_file(self.pcap_dest_path)
+            created_files.insert(1, self.label_manager.label_file_path)
+
+            # print status message
+            print('\nOutput files created:')
+            for filepath in created_files:
+                print(filepath)
         else:
-            tmp_path_tuple = self.pcap_dest_path.rpartition("/")
-            result_path = Util.OUT_DIR + tmp_path_tuple[2]
-
-        os.rename(self.pcap_dest_path, result_path)
-        self.pcap_dest_path = result_path
-        created_files = [self.pcap_dest_path]
-
-        # process/move other created files
-        pcap_root = os.path.splitext(self.pcap_dest_path)[0]
-        for k, v in Util.MISC_OUT_FILES.items():
-            if v is None:
-                created_files.append(k)
-            else:
-                outpath = pcap_root + "_" + k
-                os.rename(v, outpath)
-                created_files.append(outpath)
-
-        print("done.")
-
-        # delete intermediate PCAP files
-        print('Deleting intermediate attack pcap...', end=" ")
-        sys.stdout.flush()  # force python to print text immediately
-        os.remove(attacks_pcap_path)
-        print("done.")
-
-        # write label file with attacks
-        self.label_manager.write_label_file(self.pcap_dest_path)
-        created_files.insert(1, self.label_manager.label_file_path)
-
-        # print status message
-        print('\nOutput files created:')
-        for filepath in created_files:
-            print(filepath)
+            print("done.")
+            print('\nOutput files created:')
+            print("--> No packets were injected. Therefore no output files were created.")
 
         # print summary statistics
         if not self.non_verbose: