Method _get_client_hello

mitmproxy/addons/next_layer.py:300–338

Try to read a TLS/DTLS/QUIC ClientHello from data_client. Returns: A complete ClientHello, or None, if no ClientHello was found. Raises: NeedsMoreData, if the ClientHello is incomplete.

(context: Context, data_client: bytes)

    @staticmethod
    def _get_client_hello(context: Context, data_client: bytes) -> ClientHello | None:
        """
        Try to read a TLS/DTLS/QUIC ClientHello from data_client.

        Returns:
            A complete ClientHello, or None, if no ClientHello was found.

        Raises:
            NeedsMoreData, if the ClientHello is incomplete.
        """
        match context.client.transport_protocol:
            case "tcp":
                if starts_like_tls_record(data_client):
                    try:
                        ch = parse_client_hello(data_client)
                    except ValueError:
                        pass
                    else:
                        if ch is None:
                            raise NeedsMoreData
                        return ch
                return None
            case "udp":
                try:
                    return quic_parse_client_hello_from_datagrams([data_client])
                except ValueError:
                    pass

                try:
                    ch = dtls_parse_client_hello(data_client)
                except ValueError:
                    pass
                else:
                    if ch is None:
                        raise NeedsMoreData
                    return ch
                return None
            case _:  # pragma: no cover
                assert_never(context.client.transport_protocol)

    @staticmethod
    def _setup_reverse_proxy(context: Context, data_client: bytes) -> Layer: