Task: Implement a Dual-Stack IPv4/IPv6 Client-Server Application with Proper sockaddr in6 Field Handling

Task: Implement a Dual-Stack IPv4/IPv6 Client-Server Application with Proper sockaddr in6 Field Handling: a task in Terminal-Lego-15k (Harbor dataset). You are adding IPv6 support to an existing IPv4 client/server application. Your task is to implement a dual-stack TCP echo server and client in C…

The task

You are adding IPv6 support to an existing IPv4 client/server application. Your task is to implement a dual-stack TCP echo server and client in C that correctly handles the `sockaddr_in6` structure fields, specifically `sin6_flowinfo` and `sin6_scope_id`.

Part of PrimeIntellect/Terminal-Lego-15k.