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+% dbs-20221102.pdf - Lecture Slides on Databases and Information Security
+% Copyright (C) 2023 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: Kurzeinführung TCP/IP
+
+\documentclass[10pt,t]{beamer}
+
+\usepackage{pgslides}
+\usepackage{tikz}
+\usepackage{rotating}
+
+\newcommand{\vfilll}{\vspace{0pt plus 1filll}}
+
+\newcommand{\underconstruction}{%
+ \begin{picture}(0,0)
+ \put(11,1.2){\makebox(0,0)[b]{\includegraphics[width=1.5cm]{Zeichen_123.pdf}}}
+ \put(11,0.9){\makebox(0,0)[t]{\shortstack{Änderungen\\vorbehalten}}}
+ \end{picture}}
+
+\title{Datenbanken und Datensicherheit}
+\author{Prof.\ Dr.\ rer.\ nat.\ Peter Gerwinski}
+\date{2.\ November 2023}
+
+\definecolor{ethernet}{rgb}{0.95,0.95,0.95}
+\definecolor{ip}{rgb}{0.85,0.85,1.0}
+\definecolor{tcp}{rgb}{0.925,1.0,0.925}
+\definecolor{data}{rgb}{1.0,0.85,0.85}
+
+\newcommand{\bitno}[1]{%
+ \begin{picture}(1,1)
+ \scriptsize
+ \put(0,0){\line(1,0){1}}
+ \put(0,0){\line(0,1){1}}
+ \put(0,1){\line(1,0){1}}
+ \put(1,0){\line(0,1){1}}
+ \put(0.5,0.5){\makebox(0,0){#1}}
+ \end{picture}}
+\newcommand{\byteno}[1]{%
+ \begin{picture}(2,1)
+ \scriptsize
+ \put(0,0){\line(1,0){2}}
+ \put(0,0){\line(0,1){1}}
+ \put(0,1){\line(1,0){2}}
+ \put(2,0){\line(0,1){1}}
+ \put(1,0.5){\makebox(0,0){#1}}
+ \end{picture}}
+\newcommand{\vbitno}[1]{%
+ \begin{picture}(2,3)
+ \scriptsize
+ \put(0,0){\line(1,0){2}}
+ \put(0,0){\line(0,1){3}}
+ \put(0,3){\line(1,0){2}}
+% \put(2,0){\line(0,1){3}}
+ \put(1.6,1.5){\makebox(0,0)[r]{#1}}
+ \end{picture}}
+\newcommand{\vqbitno}[1]{%
+ \begin{picture}(2,11.875) % ???
+ \scriptsize
+ \put(0,0){\line(1,0){2}}
+ \put(0,0){\line(0,1){12}}
+ \put(0,12){\line(1,0){2}}
+% \put(2,0){\line(0,1){12}}
+ \put(1.6,10.5){\makebox(0,0)[r]{#1}}
+ \end{picture}}
+\newcommand{\genericbitbox}[5]{%
+ \begin{picture}(#1,3)
+ \footnotesize
+ \def\testl{#3}
+ \def\testr{#4}
+ \ifx\testl\testr
+ \put(0,0){\color{#3}\rule{#1\unitlength}{3\unitlength}}
+ \else
+ \put(0,0.0){\color{#3}\rule{#1\unitlength}{0.5\unitlength}}
+ \put(0,0.5){\color{#4}\rule{#1\unitlength}{2\unitlength}}
+ \put(0,2.5){\color{#3}\rule{#1\unitlength}{0.5\unitlength}}
+ \put(0,0){\color{#3}\rule{0.5\unitlength}{3\unitlength}}
+ \put(#1,0){\color{#3}\makebox(0,0)[br]{\rule{0.5\unitlength}{3\unitlength}}}
+ \fi
+ \put(0,0){\line(1,0){#1}}
+ \put(0,3){\line(1,0){#1}}
+ \def\testl{flex}
+ \def\testr{#5}
+ \ifx\testl\testr
+ \put(0,0){\line(0,1){1.2}}
+ \put(#1,0){\line(0,1){1.2}}
+ \put(0,3){\line(0,-1){1.2}}
+ \put(#1,3){\line(0,-1){1.2}}
+ \put(0,1.0){\makebox(0,0){\large\char126}}
+ \put(0,1.6){\makebox(0,0){\large\char126}}
+ \put(#1,1.0){\makebox(0,0){\large\char126}}
+ \put(#1,1.6){\makebox(0,0){\large\char126}}
+ \else
+ \put(0,0){\line(0,1){3}}
+ \put(#1,0){\line(0,1){3}}
+ \fi
+ \put(0,1.5){\makebox(0,0)[l]{\hbox to #1\unitlength{\hss#2\hss}}}
+ \end{picture}}
+\newcommand{\bitbox}[2]{\genericbitbox{#1}{#2}{\headercolor}{\headercolor}{normal}}
+\newcommand{\flexbitbox}[2]{\genericbitbox{#1}{#2}{\headercolor}{\headercolor}{flex}}
+\newcommand{\databitbox}[2]{\genericbitbox{#1}{#2}{\headercolor}{\datacolor}{flex}}
+\newcommand{\qbitbox}[2]{%
+ \begin{picture}(#1,11.875) % ???
+ \footnotesize
+ \put(0,0){\color{\headercolor}\rule{#1\unitlength}{12\unitlength}}
+ \put(0,0){\line(1,0){#1}}
+ \put(0,12){\line(1,0){#1}}
+ \put(0,0){\line(0,1){12}}
+ \put(#1,0){\line(0,1){12}}
+ \put(0,6){\makebox(0,0)[l]{\hbox to #1\unitlength{\hss#2\hss}}}
+ \end{picture}}
+\newcommand{\emptybox}[3]{%
+ \begin{picture}(#1,#2)
+ \put(0,#2){\makebox(0,0)[tl]{\footnotesize #3}}
+ \end{picture}}
+\newcommand{\headerbox}[1]{\emptybox{2}{1}{#1}}
+
+\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/dbs}}}%
+ \item[\textbf{2}] \textbf{Kurzeinführung Unix}
+ \item[\textbf{3}] \textbf{Kurzeinführung TCP/IP}
+ \begin{itemize}
+ \color{medgreen}
+ \item[3.1] IP-Adressen
+ \item[3.2] MAC-Adressen
+ \item[3.3] TCP- und UDP-Ports
+ \color{red}
+ \item[3.4] TCP-Protokolle
+ \item[3.5] Routing
+ \item[3.6] Netzwerkanalyse
+ \item[3.7] SSH
+ \item[3.8] X11
+ \end{itemize}
+ \item[\textbf{4}] \textbf{Relationale Datenbanken}
+ \vspace*{-\smallskipamount}
+ \item[\textbf{\dots}]
+ \end{itemize}
+
+ \vfilll
+ \underconstruction
+
+\end{frame}
+
+\setcounter{section}{2}
+\section{Kurzeinführung TCP/IP}
+
+\subsection{IP-Adressen}
+
+\begin{frame}[fragile]
+
+ \showsubsection
+
+ \begin{itemize}
+ \item \lstinline[style=cmd]{ip addr} (Linux)\\
+ \lstinline[style=cmd]{ifconfig} (Unix allgemein)\\
+ \lstinline[style=cmd]{ipconfig} (MS Windows)
+ \item \lstinline[style=cmd]{ip addr add <Netz>}
+% \\
+% Beispiel:
+% \lstinline[style=cmd]{ip addr add 192.168.2.197/24}\\
+% \includegraphics[width=7cm]{../20171026/photo-20171026-142620.jpg}
+ \item \lstinline[style=cmd]{ip link}
+ \item \lstinline[style=cmd]{ping <IP-Adresse>}
+ \end{itemize}
+
+ \medskip
+
+ \begin{lstlisting}[style=terminal]
+ # ifconfig
+ lo: flags=73<UP,LOOPBACK,RUNNING> mtu 65536
+ inet 127.0.0.1 netmask 255.0.0.0
+ inet6 ::1 prefixlen 128 scopeid 0x10<host>
+ [...]
+
+ wlan0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500
+ inet 192.168.42.101 netmask 255.255.255.0
+ broadcast 192.168.42.255
+ ether be:3f:ca:aa:7e:51 txqueuelen 1000 (Ethernet)
+ [...]
+ \end{lstlisting}
+
+\end{frame}
+
+\begin{frame}
+
+ \showsubsection
+
+ IPv4-Adressen:
+ \begin{itemize}
+ \item
+ 32 Bit
+ \item
+ dezimal, 4 Gruppen zu je 8 Bit (0--255), durch Punkte getrennt
+ \end{itemize}
+
+ \medskip
+
+ IPv6-Adressen:
+ \begin{itemize}
+ \item
+ 128 Bit
+ \item
+ hexadezimal, 8 Gruppen zu je 4 Hex-Ziffern, durch Doppelpunkte getrennt
+ \item
+ Führende Nullen dürfen weggelassen werden.
+ \item
+ Zwei Dopppelpunkte bedeuten: Mit Nullen auffüllen.
+ \item
+ Literatur und Beispiel: \url{https://de.wikipedia.org/wiki/IPv6}
+ \end{itemize}
+
+\end{frame}
+
+\subsection{MAC-Adressen}
+
+\begin{frame}
+
+ \showsubsection
+
+ MAC = Media Access Control
+
+ \smallskip
+
+ MAC-Adresse = Hardware-Adresse = Ethernet-Adresse
+
+ \begin{itemize}
+ \item \lstinline[style=cmd]{ip neig}\\
+ \lstinline[style=cmd]{arp}
+ \end{itemize}
+
+\end{frame}
+
+\subsection{TCP- und UDP-Ports}
+
+\begin{frame}
+
+ \showsubsection
+
+ \begin{itemize}
+ \item
+ \lstinline[style=cmd]{nc <IP> <Port>}\\
+ Verbindung zu Programm $\langle$Port$\rangle$
+ auf Rechner $\langle$IP$\rangle$ aufnehmen
+ \item
+ \lstinline[style=cmd]{nc -l <Port>}
+ oder
+ \lstinline[style=cmd]{nc -p <Port> -l}\\
+ auf eingehende Verbindungen warten ("`lauschen"')
+ \medskip
+ \item
+ TCP-Ports: Verbindungskonzept, Netzwerk prüft
+ \item
+ UDP-Ports: einzelne Pakete, Anwendung muß selbst prüfen
+ \item
+ ICMP: keine Ports, nur Rechner:\\
+ Erreichbarkeit, Eigenschaften der Übertragung
+ \end{itemize}
+
+ \medskip
+
+ \begin{center}
+ \renewcommand{\arraystretch}{1.2}
+ \begin{tabular}{|l|}\hline
+ Anwendung: HTTP, SMTP, \dots \\\hline
+ Transport: TCP-/UDP-Ports, ICMP \\\hline
+ Internet: IP-Adresse \\\hline
+ Netzwerkzugang: Hardware-/MAC-Adresse \\\hline
+ \end{tabular}
+ \end{center}
+
+\end{frame}
+
+\begin{frame}
+
+ \begin{center}
+ \begin{picture}(8,8.7)(0,3)
+ \put(0,0){\color{ethernet}\rule{8cm}{9cm}}
+ \put(0,3){\line(1,0){8}}
+ \put(0,3){\line(0,1){9}}
+ \put(0,12){\line(1,0){8}}
+ \put(8,3){\line(0,1){9}}
+ \put(0,4){\line(1,0){8.0}}
+ \put(0,11){\line(1,0){8.0}}
+ \put(4,11.5){\makebox(0,0){Ethernet-Vorspann}}
+ \put(4,3.5){\makebox(0,0){Ethernet-Nachspann}}
+ \put(4,10.75){\makebox(0,0){Ethernet-Nutzdaten}}
+ \put(0.2,4.1){\color{ip}\rule{7.6cm}{6.4cm}}
+ \put(0.2,4.1){\line(1,0){7.6}}
+ \put(0.2,4.1){\line(0,1){6.4}}
+ \put(0.2,10.5){\line(1,0){7.6}}
+ \put(7.8,4.1){\line(0,1){6.4}}
+ \put(4,10.0){\makebox(0,0){IP-Vorspann}}
+ \put(0.2,9.5){\line(1,0){7.6}}
+ \put(4,9.25){\makebox(0,0){IP-Nutzdaten}}
+ \put(0.4,4.2){\color{tcp}\rule{7.2cm}{4.8cm}}
+ \put(0.4,4.2){\line(1,0){7.2}}
+ \put(0.4,4.2){\line(0,1){4.8}}
+ \put(0.4,9.0){\line(1,0){7.2}}
+ \put(7.6,4.2){\line(0,1){4.8}}
+ \put(4,8.5){\makebox(0,0){TCP-Vorspann}}
+ \put(0.4,8.0){\line(1,0){7.2}}
+ \put(4,7.75){\makebox(0,0){TCP-Nutzdaten}}
+ \put(0.6,4.3){\color{data}\rule{6.8cm}{3.2cm}}
+ \put(0.6,4.3){\line(1,0){6.8}}
+ \put(0.6,4.3){\line(0,1){3.2}}
+ \put(0.6,7.5){\line(1,0){6.8}}
+ \put(7.4,4.3){\line(0,1){3.2}}
+ \put(4,7.0){\makebox(0,0){usw.}}
+ \put(4,5.9){\makebox(0,0){Nutzdaten}}
+ \end{picture}
+ \end{center}
+
+\end{frame}
+
+\begin{frame}
+
+ Ethernet-Frame: transportiert IP-Paket
+
+ \def\headercolor{ethernet}
+ \def\datacolor{ip}
+ \begin{center}
+ \setlength{\unitlength}{0.3333cm}%
+ \setlength{\baselineskip}{3\unitlength}\par
+% \label{...}%
+% \begin{picture}(0,0)
+% \put(0,0){\makebox(0,0){\footnotesize$\overbrace{\rule{32\unitlength}{0pt}}^{\mbox{32 Bit}}$}}
+% \put(20,-3){\makebox(0,0)[t]{\footnotesize $\left.\rule{0pt}{9.25\unitlength}\right\}$ TCP-Header}}
+% \put(20.15,-21){\makebox(0,0)[t]{\footnotesize $\left.\rule{0pt}{1.75\unitlength}\right\}$ TCP-Nutzdaten}}
+% \end{picture}\\*
+ \headerbox{byte}%
+ \byteno{0}\byteno{}\byteno{}\byteno{}\byteno{4}\byteno{}\byteno{}\byteno{}\\*
+ \vbitno{0}\bitbox{14}{preamble}\bitbox{2}{\shortstack{S\\F\\D}}\\*
+ \vbitno{8}\bitbox{12}{destination MAC address}\emptybox{4}{3}{}\\*
+ \vbitno{14}\bitbox{12}{source MAC address}\emptybox{4}{3}{}\\*
+ \vbitno{20}\bitbox{8}{tag}\bitbox{4}{type}\emptybox{4}{3}{}\\*
+ \vbitno{26}\databitbox{12}{data}\emptybox{4}{3}{}\\*
+ \vbitno{}\bitbox{4}{padding}\bitbox{8}{CRC}\emptybox{4}{3}{}
+ \end{center}
+
+\end{frame}
+
+\begin{frame}
+
+ IP-Paket: transportiert TCP-Datagramm, UDP- oder ICMP-Paket
+
+ \def\headercolor{ip}
+ \def\datacolor{tcp}
+ \begin{center}
+ \setlength{\unitlength}{0.3333cm}%
+ \setlength{\baselineskip}{3\unitlength}\par
+ \label{IPv4-Header}%
+% \begin{picture}(0,0)
+% \put(0,0){\makebox(0,0){\footnotesize$\overbrace{\rule{32\unitlength}{0pt}}^{\mbox{32 Bit}}$}}
+% \put(20,-3){\makebox(0,0)[t]{\footnotesize $\left.\rule{0pt}{9.25\unitlength}\right\}$ IPv4-Header}}
+% \put(20.15,-21){\makebox(0,0)[t]{\footnotesize $\left.\rule{0pt}{1.75\unitlength}\right\}$ IPv4-Nutzlast}}
+% \end{picture}\\*
+ \headerbox{bit}%
+ \bitno{0}\bitno{}\bitno{}\bitno{}\bitno{}\bitno{}\bitno{}\bitno{}%
+ \bitno{}\bitno{}\bitno{}\bitno{}\bitno{}\bitno{}\bitno{}\bitno{15}%
+ \bitno{16}\bitno{}\bitno{}\bitno{}\bitno{}\bitno{}\bitno{}\bitno{}%
+ \bitno{}\bitno{}\bitno{}\bitno{}\bitno{}\bitno{}\bitno{}\bitno{31}\\*
+ \vbitno{0}\bitbox{4}{version}%
+ \bitbox{4}{\shortstack{IP header\\length}}%
+ \bitbox{8}{type of service}%
+ \bitbox{16}{total length}\\*
+ \vbitno{32}\bitbox{16}{identification}%
+ \bitbox{1}{\begin{rotate}{90}\makebox(0,0){\scriptsize reserved}\end{rotate}}%
+ \bitbox{1}{\shortstack{D\\F}}%
+ \bitbox{1}{\shortstack{M\\F}}%
+ \bitbox{13}{fragment offset}\\*
+ \vbitno{64}\bitbox{8}{time to live}%
+ \bitbox{8}{protocol}%
+ \bitbox{16}{header checksum}\\*
+ \vbitno{96}\bitbox{32}{source address}\\*
+ \vbitno{128}\bitbox{32}{destination address}\\*
+ \vbitno{160}\flexbitbox{32}{options and padding (optional)}\\*
+ \vbitno{}\databitbox{32}{data}
+ \end{center}
+
+\end{frame}
+
+\begin{frame}
+
+ TCP-Datagramm: transportiert Anwendungsdaten
+
+ \def\headercolor{tcp}
+ \def\datacolor{data}
+ \begin{center}
+ \setlength{\unitlength}{0.3333cm}%
+ \setlength{\baselineskip}{3\unitlength}\par
+ \label{TCP-Header}%
+% \begin{picture}(0,0)
+% \put(0,0){\makebox(0,0){\footnotesize$\overbrace{\rule{32\unitlength}{0pt}}^{\mbox{32 Bit}}$}}
+% \put(20,-3){\makebox(0,0)[t]{\footnotesize $\left.\rule{0pt}{9.25\unitlength}\right\}$ TCP-Header}}
+% \put(20.15,-21){\makebox(0,0)[t]{\footnotesize $\left.\rule{0pt}{1.75\unitlength}\right\}$ TCP-Nutzlast}}
+% \end{picture}\\*
+ \headerbox{bit}%
+ \bitno{0}\bitno{}\bitno{}\bitno{}\bitno{}\bitno{}\bitno{}\bitno{}%
+ \bitno{}\bitno{}\bitno{}\bitno{}\bitno{}\bitno{}\bitno{}\bitno{15}%
+ \bitno{16}\bitno{}\bitno{}\bitno{}\bitno{}\bitno{}\bitno{}\bitno{}%
+ \bitno{}\bitno{}\bitno{}\bitno{}\bitno{}\bitno{}\bitno{}\bitno{31}\\*
+ \vbitno{0}\bitbox{16}{source port}\bitbox{16}{destination port}\\*
+ \vbitno{32}\bitbox{32}{sequence number}\\*
+ \vbitno{64}\bitbox{32}{acknowledegment number}\\*
+ \vbitno{96}\bitbox{4}{\shortstack{data\\offset}}%
+ \bitbox{6}{reserved}%
+ \bitbox{1}{\shortstack{U\\R\\G}}%
+ \bitbox{1}{\shortstack{A\\C\\K}}%
+ \bitbox{1}{\shortstack{P\\S\\H}}%
+ \bitbox{1}{\shortstack{R\\S\\T}}%
+ \bitbox{1}{\shortstack{S\\Y\\N}}%
+ \bitbox{1}{\shortstack{F\\I\\N}}%
+ \bitbox{16}{window}\\*
+ \vbitno{128}\bitbox{16}{checksum}%
+ \bitbox{16}{urgent pointer}\\*
+ \vbitno{160}\flexbitbox{32}{\shortstack{options\\(0 oder mehr 32-Bit-Wörter)}}\\*
+ \vbitno{}\databitbox{32}{data}
+ \end{center}
+
+\end{frame}
+
+\begin{frame}
+
+ UDP-Paket: transportiert Anwendungsdaten
+
+ \def\headercolor{tcp}
+ \def\datacolor{data}
+ \begin{center}
+ \setlength{\unitlength}{0.3333cm}%
+ \setlength{\baselineskip}{3\unitlength}\par
+ \label{UDP-Header}%
+% \begin{picture}(0,0)
+% \put(0,0){\makebox(0,0){\footnotesize$\overbrace{\rule{32\unitlength}{0pt}}^{\mbox{32 Bit}}$}}
+% \put(20,-3){\makebox(0,0)[t]{\footnotesize $\left.\rule{0pt}{3.25\unitlength}\right\}$ UDP-Header}}
+% \put(20.15,-9){\makebox(0,0)[t]{\footnotesize $\left.\rule{0pt}{1.75\unitlength}\right\}$ UDP-Nutzlast}}
+% \end{picture}\\*
+ \headerbox{bit}%
+ \bitno{0}\bitno{}\bitno{}\bitno{}\bitno{}\bitno{}\bitno{}\bitno{}%
+ \bitno{}\bitno{}\bitno{}\bitno{}\bitno{}\bitno{}\bitno{}\bitno{15}%
+ \bitno{16}\bitno{}\bitno{}\bitno{}\bitno{}\bitno{}\bitno{}\bitno{}%
+ \bitno{}\bitno{}\bitno{}\bitno{}\bitno{}\bitno{}\bitno{}\bitno{31}\\*
+ \vbitno{0}\bitbox{16}{source port}\bitbox{16}{destination port}\\*
+ \vbitno{32}\bitbox{16}{length}%
+ \bitbox{16}{checksum}\\*
+ \vbitno{64}\databitbox{32}{data}
+ \end{center}
+
+\end{frame}
+
+\begin{frame}
+
+ ICMP-Paket: transportiert Steuernachrichten
+
+ \def\headercolor{tcp}
+ \def\datacolor{data}
+ \begin{center}
+ \setlength{\unitlength}{0.3333cm}%
+ \setlength{\baselineskip}{3\unitlength}\par
+ \label{ICMP-Header}%
+% \begin{picture}(0,0)
+% \put(0,0){\makebox(0,0){\footnotesize$\overbrace{\rule{32\unitlength}{0pt}}^{\mbox{32 Bit}}$}}
+% \put(20,-3){\makebox(0,0)[t]{\footnotesize $\left.\rule{0pt}{1.75\unitlength}\right\}$ ICMP-Header}}
+% \put(20.15,-6){\makebox(0,0)[t]{\footnotesize $\left.\rule{0pt}{1.75\unitlength}\right\}$ ICMP-Nutzlast}}
+% \end{picture}\\*
+ \headerbox{bit}%
+ \bitno{0}\bitno{}\bitno{}\bitno{}\bitno{}\bitno{}\bitno{}\bitno{}%
+ \bitno{}\bitno{}\bitno{}\bitno{}\bitno{}\bitno{}\bitno{}\bitno{15}%
+ \bitno{16}\bitno{}\bitno{}\bitno{}\bitno{}\bitno{}\bitno{}\bitno{}%
+ \bitno{}\bitno{}\bitno{}\bitno{}\bitno{}\bitno{}\bitno{}\bitno{31}\\*
+ \vbitno{0}\bitbox{8}{type}%
+ \bitbox{8}{code}%
+ \bitbox{16}{checksum}\\*
+ \vbitno{32}\databitbox{32}{data}
+ \end{center}
+
+\end{frame}
+
+\subsection{TCP-Protokolle}
+
+\begin{frame}
+
+ \showsubsection
+
+ \begin{itemize}
+ \item
+ \textbf{SMTP}\\
+ \lstinline[style=cmd]{HELO cassini}\\
+ \lstinline[style=cmd]{MAIL FROM: <example@example.com>}\\
+ \lstinline[style=cmd]{RCPT TO: <beispiel@example.de>}\\
+ (E-Mail-Header -- Teil der Nutzdaten)\\
+ \lstinline[style=cmd]{From: Eddie Example <example@example.com>}\\
+ \lstinline[style=cmd]{To: Bert Beispiel <beispiel@example.de>}\\
+ \lstinline[style=cmd]{Subject: Hello, world!}\\
+ (Leerzeile)\\
+ \lstinline[style=cmd]{Hi, there!}\\
+ \lstinline[style=cmd]{.}
+ \pause
+ \smallskip
+ \item
+ \textbf{HTTP}\\
+ \lstinline[style=cmd]{GET / HTTP/1.1}\\
+ \lstinline[style=cmd]{Host: www.hs-bochum.de}\\
+ (Leerzeile)
+% \begin{onlyenv}<2>
+ \par\medskip
+ URL: Schema://Benutzer:Passwort@Rechner:port/Pfad?Query\#Fragment
+% \end{onlyenv}
+ \pause
+ \medskip
+ \item
+ Protokolle "`mal eben"' selbst schreiben:
+ \lstinline[style=cmd]{nc -c} oder \file{inetd}
+ \end{itemize}
+
+\end{frame}
+
+\subsection{Routing}
+
+\begin{frame}[fragile]
+
+ \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}
+
+ \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}
+
+ \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}
+
+\begin{frame}
+
+ \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
+ \end{itemize}
+
+\end{frame}
+
+\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/dbs}}}%
+ \item[\textbf{2}] \textbf{Kurzeinführung Unix}
+ \item[\textbf{3}] \textbf{Kurzeinführung TCP/IP}
+ \begin{itemize}
+ \item[3.1] IP-Adressen
+ \item[3.2] MAC-Adressen
+ \item[3.3] TCP- und UDP-Ports
+ \color{medgreen}
+ \item[3.4] TCP-Protokolle
+ \item[3.5] Routing
+ \item[3.6] Netzwerkanalyse
+ \item[3.7] SSH
+ \item[3.8] X11
+ \end{itemize}
+ \item[\textbf{4}] \textbf{Relationale Datenbanken}
+ \vspace*{-\smallskipamount}
+ \item[\textbf{\dots}]
+ \end{itemize}
+
+ \vfilll
+ \underconstruction
+
+\end{frame}
+
+\end{document}
diff --git a/20231102/logo-hochschule-bochum-cvh-text-v2.pdf b/20231102/logo-hochschule-bochum-cvh-text-v2.pdf
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@@ -0,0 +1 @@
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diff --git a/20231102/logo-hochschule-bochum.pdf b/20231102/logo-hochschule-bochum.pdf
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+../common/logo-hochschule-bochum.pdf
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diff --git a/20231102/pgslides.sty b/20231102/pgslides.sty
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+../common/pgslides.sty
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