Ineffective slow lory mitigation

[fd]

go-proxyproto/v1.go

Lines 70 to 91 in eef9d7e

	buf := make([]byte, 0, 107)
	for {
	b, err := reader.ReadByte()
	if err != nil {
	return nil, fmt.Errorf(ErrCantReadVersion1Header.Error()+": %v", err)
	}
	buf = append(buf, b)
	if b == '\n' {
	// End of header found
	break
	}
	if len(buf) == 107 {
	// No delimiter in first 107 bytes
	return nil, ErrVersion1HeaderTooLong
	}
	if reader.Buffered() == 0 {
	// Header was not buffered in a single read. Since we can't
	// differentiate between genuine slow writers and DoS agents,
	// we abort. On healthy networks, this should never happen.
	return nil, ErrCantReadVersion1Header
	}
	}

Instead of doing a single Peak or 107 ReadByte calls this should do one read syscall. into a buffer. and pass the rest of the buffer as a first read to the caller.