Implement NTP: Query a Time Server and Parse the Response

Write a C program that builds an NTP client query and parses the response timestamps. Show how to convert NTP timestamps to Unix time.

Requirements:

• Create a UDP socket and connect to an NTP server (e.g., pool.ntp.org or 129.6.15.28) on port 123
• Build a 48-byte NTP request packet with version=3, mode=3 (client)
• Send the packet and receive the 48-byte response
• Parse the response header to extract stratum, leap indicator, and mode
• Extract the transmit timestamp from bytes 40-47
• Convert the NTP 64-bit timestamp to Unix time (seconds since 1970)
• Print the raw packet bytes in hexadecimal
• Print the parsed timestamps and the converted Unix time
• Show each field with clear printf labels