What is the proper way to obtain a dynamic source port for a raw socket (IP_HDRINCL) on macOS for a custom TCP implementation?

What is the correct method for obtaining a dynamic source port for a raw socket (with IP_HDRINCL) when implementing a custom TCP solution on macOS?

To obtain a dynamic source port for a raw socket (IP_HDRINCL) on macOS for a custom TCP implementation, you can follow these steps:

Create a TCP Socket: Create a TCP socket and bind it to a dynamic port by setting the port number to 0.

Retrieve the Dynamic Port: Use the getsockname function to retrieve the dynamically assigned port.

Create a Raw Socket: Create a raw socket with the IP_HDRINCL option enabled.

Bind the Raw Socket: Bind the raw socket to the dynamic port obtained from the TCP socket.

By following these steps, you can ensure that your custom TCP implementation on macOS uses a dynamic source port without conflicts.