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🔍 DNS Lookup Tool (C++)

A simple C++ command-line utility that performs DNS lookups using the getaddrinfo() API.
It displays detailed information about the resolved IP addresses, including protocol family, socket type, and protocol type.

🧠 Overview

This tool resolves a given hostname (like google.com) into its corresponding IP addresses (IPv4 and/or IPv6).
It uses modern C++ syntax (typedefs, std::string, clean function design) while still interacting directly with low-level POSIX networking APIs.

⚙️ Features

  • Performs DNS lookups using the standard getaddrinfo() function
  • Supports both IPv4 and IPv6
  • Prints:
    • Address family (AF_INET, AF_INET6)
    • Socket type (SOCK_STREAM, SOCK_DGRAM)
    • Protocol type (TCP, UDP, etc.)
    • Human-readable IP addresses (via inet_ntop())
  • Clean and modular C++ implementation

Learning Sources

  • Beej's guide to Network Programming
  • Daniel Hirsch's youtube video on Coding DNS lookup from scratch in C.

Sample Input

./lookup google.com

Sample Output

Performing DNS lookup for google.com
DNS Lookup for google.com
Family: IPv4
SocketType: TCP/IP
Protocol: TCP
IPv4: 142.250.195.78

Family: IPv6
SocketType: TCP/IP
Protocol: TCP
IPv6: 2607:f8b0:4004:c17::66

Vasanth Nayak. Embedded Software Developer