Added variable initialization to prevent UnboundLocalError

src/packet/BOOTP.py

@@ -70,6 +70,10 @@ class BOOTP(Packet):
         # Get field which will be modified
         field = random.choice(self.fields)
 
+        # Initialize old and new values
+        old_value = None
+        new_value = None
+
         if field == "chaddr":
             old_value = self.layer.getfieldval("chaddr")  # Store old value of field
             new_value = Packet.bytes_edit_char(old_value[:6]) + old_value[6:]  # Randomly change one byte in the MAC address

src/packet/CoAP.py

@@ -80,6 +80,10 @@ class CoAP(Packet):
         # Get field which will be modified
         field = random.choice(self.fields)
 
+        # Initialize old and new values
+        old_value = None
+        new_value = None
+
         # Chosen field is an integer
         if field == "type" or field == "code":
             old_value = self.layer.getfieldval(field)

src/packet/DNS.py

@@ -52,6 +52,10 @@ class DNS(Packet):
         # Get auxiliary fields
         qdcount = self.layer.getfieldval("qdcount")
         question_record = self.layer.getfieldval("qd") if qdcount > 0 else None
+
+        # Initialize old and new values
+        old_value = None
+        new_value = None
         
         # Field is QR flag
         if field == "qr":