Vortragsfolien, Beispiele und Tafelbilder 2.11.2022

20221102/es-20221102.tex

+% es-20221102.pdf - Lecture Slides on Embedded Systems
+% Copyright (C) 2013, 2014, 2015, 2016, 2017, 2018, 2019, 2020, 2021, 2022 Peter Gerwinski
+%
+% This document is free software: you can redistribute it and/or
+% modify it either under the terms of the Creative Commons
+% Attribution-ShareAlike 3.0 License, or under the terms of the
+% GNU General Public License as published by the Free Software
+% Foundation, either version 3 of the License, or (at your option)
+% any later version.
+%
+% This document is distributed in the hope that it will be useful,
+% but WITHOUT ANY WARRANTY; without even the implied warranty of
+% MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+% GNU General Public License for more details.
+%
+% You should have received a copy of the GNU General Public License
+% along with this document.  If not, see <http://www.gnu.org/licenses/>.
+%
+% You should have received a copy of the Creative Commons
+% Attribution-ShareAlike 3.0 Unported License along with this
+% document.  If not, see <http://creativecommons.org/licenses/>.
+
+% README: VNC, Netzwerkprogrammierung
+
+\documentclass[10pt,t]{beamer}
+
+\usepackage{pgslides}
+\usepackage{rotating}
+\usepackage{tikz}
+
+\newcommand{\underconstruction}{%
+  \begin{picture}(0,0)
+    \put(9,0.9){\makebox(0,0)[b]{\includegraphics[width=1.5cm]{Zeichen_123.pdf}}}
+    \put(9,0.6){\makebox(0,0)[t]{\shortstack{Änderungen\\vorbehalten}}}
+  \end{picture}}
+
+\title{Eingebettete Systeme}
+\author{Prof.\ Dr.\ rer.\ nat.\ Peter Gerwinski}
+\date{2.\ November 2022}
+
+\newcommand{\greyurl}[1]{\href{#1}{\color{gray}\nolinkurl{#1}}}
+\newcommand{\ItwoC}{I\raisebox{0.5ex}{\footnotesize 2}C}
+
+\begin{document}
+
+\maketitleframe
+
+\nosectionnonumber{\inserttitle}
+
+\begin{frame}
+
+  \shownosectionnonumber
+
+  \begin{itemize}
+    \item[\textbf{1}] \textbf{Einführung}
+      \hfill\makebox(0,0)[br]{\raisebox{2.25ex}{\url{https://gitlab.cvh-server.de/pgerwinski/es}}}%
+    \item[\textbf{2}] \textbf{Einführung in Unix}
+    \item[\textbf{3}] \textbf{TCP/IP in der Praxis}
+      \begin{itemize}
+        \color{medgreen}
+        \item [3.1] IP-Adressen
+        \item [3.2] MAC-Adressen
+        \item [3.3] TCP- und UDP-Ports
+        \item [3.4] TCP-Protokolle
+        \item [3.5] Routing
+        \item [3.6] Netzwerkanalyse
+        \item [3.7] SSH
+        \item [3.8] X11 \color{red}und VNC
+        \item[3.9] Programmierung
+      \end{itemize}
+    \item[\textbf{\dots}]
+  \end{itemize}
+  \strut\hfill \url{https://www.peter.gerwinski.de/download/net-2013ss.tar.gz}
+
+%  \vspace*{-1cm plus 1filll}
+
+%  \underconstruction
+
+\end{frame}
+
+\setcounter{section}{2}
+\section{TCP/IP in der Praxis}
+
+\setcounter{subsection}{4}
+\subsection{Routing}
+
+\begin{frame}[fragile]
+
+  \showsection
+  \showsubsection
+
+  \begin{itemize}
+    \item
+      \lstinline[style=cmd]{ip route} (Linux)\\
+      \lstinline[style=cmd]{route} (MS-Windows, Unix)\\
+      \lstinline[style=cmd]{netstat -nr} (MacOS)
+%                                                \\[\medskipamount]
+%      \includegraphics[width=11cm]{../20171026/photo-20171026-162455.jpg}
+  \end{itemize}
+
+  \medskip
+
+  \begin{lstlisting}[style=terminal]
+    # route -n
+    Kernel-IP-Routentabelle
+    Ziel          Router        Genmask        [...]  Iface
+    0.0.0.0       192.168.42.1  0.0.0.0        [...]  wlan0
+    169.254.0.0   0.0.0.0       255.255.0.0    [...]  wlan0
+    192.168.42.0  0.0.0.0       255.255.255.0  [...]  wlan0
+  \end{lstlisting}
+
+  \bigskip
+
+  Netzmaske:\\
+  Wenn nach Und-Verknüpfung mit IP-Adresse gleich,
+  \textarrow\ im gleichen Netz
+
+  \medskip
+
+  \lstinline[style=terminal]{255.255.240.0} ist dasselbe wie
+  \lstinline[style=terminal]{/20}\\
+  (20 Bit sind 1; die restlichen 12 Bit sind 0)
+
+\end{frame}
+
+\subsection{Netzwerkanalyse}
+
+\begin{frame}
+
+  \showsection
+  \showsubsection
+
+  \begin{itemize}
+    \item
+      \lstinline[style=cmd]{tcpdump}
+    \item
+      \lstinline[style=cmd]{wireshark}
+    \item
+      \lstinline[style=cmd]{ettercap}
+  \end{itemize}
+
+\end{frame}
+
+\subsection{SSH}
+
+\begin{frame}
+
+  \showsection
+  \showsubsection
+
+  \begin{itemize}
+    \item
+      \lstinline[style=cmd]{SSH <Rechner>}
+    \item
+      \lstinline[style=cmd]{-C}: Komprimierung
+    \item
+      \lstinline[style=cmd]{-L}: lokalen Port auf Remote-Port umleiten
+    \item
+      \lstinline[style=cmd]{-R}: Remote-Port auf lokalen Port umleiten
+  \end{itemize}
+
+\end{frame}
+
+\subsection{X11 und VNC}
+
+\begin{frame}
+
+  \showsection
+  \showsubsection
+
+  \begin{itemize}
+    \item
+      Grafik-Bildschirm und Eingabegeräte über's Netz
+    \item
+      \lstinline[style=cmd]{DISPLAY}-Variable: X-Server: Rechner und Bildschirm
+    \item
+      \lstinline[style=cmd]{ssh -X}: X11-Forwarding
+    \pause
+    \bigskip
+    \item
+      VNC = Virtual Network Computing
+    \item
+      VNC-Server stellt Bildschirminhalt zur Verfügung
+      \begin{itemize}
+        \item entweder: eigener, virtueller X11-Server
+        \item oder: ruft Inhalt von anderem (X11-) Bildschirm ab
+      \end{itemize}
+    \item
+      VNC-Client ruft Bildschirminhalt ab und stellt ihn dar
+      \begin{itemize}
+        \item z.\,B.\ per X11
+        \item z.\,B.\ per Web-Interface: noVNC
+      \end{itemize}
+  \end{itemize}
+
+\end{frame}
+
+\subsection{Programmierung}
+
+\begin{frame}
+
+  \showsection
+  \showsubsection
+
+  \begin{itemize}
+    \item
+      Shell-Skripte: \file{nc} (\file{traditional} oder \file{OpenBSD})
+    \item
+      C: Sockets, \lstinline{select()}
+    \item
+      C++: Callbacks
+  \end{itemize}
+
+  \pause
+  \bigskip
+
+  Beispiel: Programmierung eines VNC-Servers per Web-Interface
+
+  \begin{itemize}
+    \item
+      Grundlagen: RFC~6143
+    \item
+      Praxis: Untersuchung mit Wireshark
+    \item
+      Implementation: JavaScript, WebSockets, \file{websockify}, Callbacks
+  \end{itemize}
+
+\end{frame}
+
+
+\end{document}

20221102/logo-hochschule-bochum-cvh-text-v2.pdf

+../common/logo-hochschule-bochum-cvh-text-v2.pdf
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20221102/logo-hochschule-bochum.pdf

+../common/logo-hochschule-bochum.pdf
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20221102/pgslides.sty

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termine.txt

@@ -9,3 +9,4 @@ Eingebettete Systeme: Termine
             *** Es bleibt dabei: ab 11:30 Uhr in Heiligenhaus bzw. online ***
 02.11.2022: bis 13:00 Uhr
 09.11.2022: bis 18:45 Uhr
+16.11.2022: bis 18:45 Uhr