nDPI  3.2
About: nDPI is a ntop-maintained superset of the popular OpenDPI (Deep Packet Inspection) library.
  Fossies Dox: nDPI-3.2.tar.gz  ("unofficial" and yet experimental doxygen-generated source code documentation)  

nDPI Documentation

Some Fossies usage hints in advance:

  1. To see the Doxygen generated documentation please click on one of the items in the steelblue colored "quick index" bar above or use the side panel at the left which displays a hierarchical tree-like index structure and is adjustable in width.
  2. If you want to search for something by keyword rather than browse for it you can use the client side search facility (using Javascript and DHTML) that provides live searching, i.e. the search results are presented and adapted as you type in the Search input field at the top right.
  3. Doxygen doesn't incorporate all member files but just a definable subset (basically the main project source code files that are written in a supported language). So to search and browse all member files you may visit the Fossies
  4. nDPI-3.2.tar.gz contents page and use the Fossies standard member browsing features (also with source code highlighting and additionally with optional code folding).

ntop ntop


Build Status Code Quality: Cpp Total Alerts Fuzzing Status

What is nDPI ?

nDPI is an open source LGPLv3 library for deep-packet inspection. Based on OpenDPI it includes ntop extensions. We have tried to push them into the OpenDPI source tree but nobody answered emails so we have decided to create our own source tree

How To Compile nDPI

In order to compile this library do

  • ./autogen.sh
  • ./configure
  • make

To run tests do additionally:

  • cd tests; ./do.sh

Please note that the pre-requisites for compilation include:

  • GNU tools (autogen, automake, autoconf, libtool)
  • GNU C compiler (gcc)

How To Add A New Protocol Dissector

The entire procedure of adding new protocols in detail:

  1. Add new protocol together with its unique ID to: src/include/ndpi_protocol_ids.h
  2. Create a new protocol in: src/lib/protocols/
  3. Variables to be kept for the duration of the entire flow (as state variables) need to be placed in: src/include/ndpi_typedefs.h in ndpi_flow_tcp_struct (for TCP only), ndpi_flow_udp_struct (for UDP only), or ndpi_flow_struct (for both).
  4. Add a new entry for the search function for the new protocol in: src/include/ndpi_protocols.h
  5. Choose (do not change anything) a selection bitmask from: src/include/ndpi_define.h
  6. Add a new entry in ndpi_set_protocol_detection_bitmask2 in: src/lib/ndpi_main.c
  7. Set protocol default ports in ndpi_init_protocol_defaults in: src/lib/ndpi_main.c
  8. ./autogen.sh
  9. make
  10. make check

How to use nDPI to Block Selected Traffic

You can use nDPI to selectively block selected Internet traffic by embedding it onto an application (remember that nDPI is just a library). Both ntopng and nProbe cento can do this.


While we do our best to detect network protocols, we cannot guarantee that our software is error free and 100% accurate in protocol detection. Please make sure that you respect the privacy of users and you have proper authorization to listen, capture and inspect network traffic.

Creating A Source File Tar Ball

If you want to distribute a source tar file of nDPI do:

  • make dist

To ensure that a tar file includes all necessary files and to run tests on distribution do:

  • make distcheck