levels of debug output:
0 - ERROR: Only for errors.
1 - TRACE: Start of each packets and if found protocol.
2 - DEBUG: Start of searching each protocol and excluding protocols.
3 - DEBUG_EXTRA: For all other messages.
Added field ndpi_struct->debug_logging for enable debug output of each protocols.
Simple macros for debugging output are added:
NDPI_LOG_ERR(), NDPI_LOG_INFO(), NDPI_LOG_DBG(), NDPI_LOG_DBG2(),
NDPI_EXCLUDE_PROTO()
1. Detected a lot of memory errors using address sanitizer
and ndpi-scapy tool.
2. Added ndpi_match_prefix function that compares strings
with taking care of payload packet len. Almost drop-in
replacement for match_first_bytes function.
3. Replaced unsafe match_first_bytes usage with a ndpi_match_prefix
and additional length checks.
