paramiko_src_note.txt

SSHClient.connect -> Transport.start_client -> Transport.run
    -> Packetizer.start_handshake
    -> Transport._send_kex_init -> Packetizer.send_message(Message.add_byte -> BytesIO.write) -> Packetizer.write_all -> socket.send
    -> Transport._expect_packet(MSG_KEXINIT)
    loop:
        -> Packetizer.read_message -> Packetizer.read_all
        if received = MSG_IGNORE
            -> continue
        elif received = MSG_DISCONNECT
            -> Transport._parse_disconnect
        elif received = MSG_DEBUG
            -> Transport._parse_debug
        elif expecting_packet
            if received != expected
                -> raise SSHException
            else
                -> clear expecting_packet
            if 30 <= received <= 41
                -> Transport.kex_engine.parse_next
        else
            if exists handler for received
                -> call handler
            elif exists channel handler for received
                -> ?
            elif exists auth handler for received
                -> call handler
            else
                -> Transport._send_message( Message(cMSG_UNIMPLEMENTED, seqno) )
        -> Packetizer.complete_handshake