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README.md 

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A high-performance CLI network analyzer built with libpcap for raw packet capture and FTXUI for a fully interactive terminal UI. The application captures packets directly from a network interface, parses protocol headers manually, aggregates statistics in real time

Developed by @deniskhud

Preview

[!IMPORTANT] Packet capture requires elevated privileges.

Run with:

sudo ./network-traffic-analyzer

Or grant capabilities:

sudo setcap cap_net_raw,cap_net_admin=eip ./network-traffic-analyzer

Or you can use just command

just run

Features

  1. Live Packet Capture

  • Capture traffic from a selected network interface
  • Support for BPF filters (e.g. tcp, port 80, udp)
  • Real-time processing using libpcap

  1. Real-Time Statistics Engine

  • Total packets & traffic volume
  • Transport protocol distribution (TCP / UDP / ICMP)
  • Application-level classification (port-based)
  • Top IP addresses
  • Top source > destination pairs

  1. Flexible Capture Modes

  • Live capture from selected network interface (-i, --interface)
  • Offline analysis from .pcap file (-r, --offline)
  • Packet count limit (-c)
  • Time limit for capture (-t)
  • Interface discovery (--interfaces)

[!TIP] For the complete list of CLI options, use: --help

Technologies

  • C++20+
  • Boost::program_options
  • libpcap
  • FTXUI
  • CMake

Setup

1. clone the repo then

cd network-traffic-analyzer
./install.sh

Usage Example

Live capture on eth0

just capture -i eth0

Capture 100 packets

just run -i wlan0 -c 100

Analyze offline pcap file

just run --offline traffic.pcap

Export results (json / csv)

just run --json result.json --csv result.csv

Learn More

Doc Contents
00-OVERVIEW.md Quick start, prerequisites, project structure
01-CONCEPTS.md libpcap internals, BPF filters, protocol header parsing
02-ARCHITECTURE.md System design, component breakdown, data flow, threading model
03-IMPLEMENTATION.md Line-by-line code walkthrough
04-CHALLENGES.md Extension ideas and advanced topics