🛡️ PCAP TCP Packet Sniffer

This is a simple TCP packet sniffer that uses the PCAP API to capture and print TCP packet information from the network.

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📁 Project Structure

pcap_tcp_programming/
├── pcap_tcp_sniffer.c    # Main source file
├── myheader.h            # Header file with Ethernet/IP/TCP structure definitions
├── Makefile              # Compilation instructions
└── README.md    

Output Information

The program prints the following details for each captured TCP packet:

• Ethernet Header: Source MAC / Destination MAC
• IP Header: Source IP / Destination IP
• TCP Header: Source Port / Destination Port
• Payload (Message): Up to 20 bytes (in hex)

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Environment Setup

• OS: Ubuntu 20.04
• Compiler: GCC 9.4.0
• Lib: libpcap

Install dependencies

sudo apt update
sudo apt install libpcap-dev

Compile

make

Run

sudo ./pcap_tcp_sniffer
#⚠️ Make sure to modify the network interface name (enp0s3, enp0s8, etc.) in the source code to match your environment.

Clean

make clean