packet padding

dhcp_basic_packet.py

         pack_fmt = str(len(packet))+"c"
 
         packet = map(chr,packet)
-        
-        return pack(pack_fmt,*packet)
+        data = pack(pack_fmt,*packet)
+        data_len = len(data)
+        if data_len < 300:
+            data = data + (300 - data_len) * '\0'
+        return data
 
 
     # Insert packet in the object