* ip-echo-server: Name the header length magic number (cherry picked from commitaab5f24518
) * ip-echo-server: Add helper to compute reply length (cherry picked from commit7481ba5618
) * ip-echo-server: Limit socket read to expected reply length (cherry picked from commitd2cfeb31b9
) Co-authored-by: Trent Nelson <trent@solana.com>