un petit push, parfois
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chap/C.tex
30
chap/C.tex
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@ -472,6 +472,36 @@ Libérer deux fois la mémoire.
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% =========================================================
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\section{Debug} \index{Debug}
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Des outils et astuces en page \pageref{chap:Debug}.
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\begin{quote}
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splint is an annotation-assisted lightweight static checker.
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It is a tool for
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statically checking C programs for security vulnerabilities and coding
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mistakes.
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If additional effort is invested in adding annotations to programs,
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splint can perform stronger checking.
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\end{quote}
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% =========================================================
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\section{Legalize}
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"The two forms of conforming implementation are hosted and freestanding.
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A conforming hosted implementation shall accept any strictly conforming
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program. A conforming freestanding implementation shall accept any
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strictly conforming program in which the use of the features specified
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in the library clause (Clause 7) is confined to the contents of the
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standard headers <float.h> , <iso646.h> , <limits.h> , <stdalign.h> ,
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<stdarg.h> , <stdbool.h> , <stddef.h> , <stdint.h> , and <stdnoreturn.h>
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. Additionally, a conforming freestanding implementation shall accept
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any strictly conforming program in which the use of the features
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specified in the header <string.h> , except the following functions:
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strdup , strndup , strcoll , strxfrm , strerror ." (4p6)
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% =========================================================
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\section{Ailleurs dans cet ouvrage}
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Il y a plein d'autres exemples de code en C, sur des sujets
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@ -70,6 +70,8 @@ tth@tranxene:~$
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\subsection{dig}
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\index{dig}
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% https://jvns.ca/blog/2021/12/04/how-to-use-dig/
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Dig (\textit{domain information groper}) est un outil d'interrogation
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des serveurs DNS. Par défaut, il questionne les serveurs
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listés dans \texttt{/etc/resolv.conf}.
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@ -80,6 +82,10 @@ Pour résoudre récursivement un nom de domaine à partir de la racine :
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Pour obtenir le reverse d'une adresse IP :
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\texttt{\$ dig +trace -x <adresse.ip>}
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% ------------------------------------------------------------
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% \subsection{delv}
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% \index{delv}
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@ -180,43 +180,7 @@ Il nius faut donc remplacer le getenv de la libc par notre propre
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version qui va écouter et exfiltrer l'utilisation de cette
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fonction.
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\begin{lstlisting}[language=C]
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/*
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spy_getenv.so: spy_getenv.c Makefile
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gcc -Wall -shared -fPIC $< -ldl -o $@
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*/
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#include <stdio.h>
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#include <string.h>
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#include <unistd.h>
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#define __USE_GNU
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#include <dlfcn.h>
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typedef char * (*original_getenv)(const char *envname);
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char *getenv(char *envname)
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{
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static char *arrow = "--getenv--> ";
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static char *wtf = " --> WTF ?";
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char *content;
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original_getenv orig_getenv;
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orig_getenv = (original_getenv)dlsym(RTLD_NEXT, "getenv");
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write(STDERR_FILENO, arrow, strlen(arrow));
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write(STDERR_FILENO, envname, strlen(envname));
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content = orig_getenv(envname);
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if (NULL != content) {
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write(STDERR_FILENO, "=", 1);
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write(STDERR_FILENO, content, strlen(content));
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}
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else {
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write(STDERR_FILENO, wtf, strlen(wtf));
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}
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write(STDERR_FILENO, "\n", 1);
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return content;
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}
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\end{lstlisting}
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\lstinputlisting[language=C]{code/debug/spy_getenv.c}
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Simple et efficace.
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@ -52,6 +52,11 @@ map_henon: map_henon.f
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Hélas, je n'ai pas de commande \texttt{g77} dans ma machine,
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que faire ? En écrire une ?
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% ==============================================================
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\section{qemu}
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\index{qemu}\label{qemu}
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http://sven.stormbind.net/blog/posts/deb\_qemu\_local\_openwrt/
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% ==============================================================
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@ -100,6 +100,27 @@ la commande\texttt{tail} au début du script. Ensuite les deux clauses
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coordonnées X et Z, dans le repère POVray, qui n'est pas le même que
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celui de Gnuplot.
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% ------------------------------------------------
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\subsection{image\_map}
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% ------------------------------------------------
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\subsection{height\_field}
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Les champs d'altitude... Toute une histoire...
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\begin{verbatim}
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#declare Champ_Altitude = object
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{
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height_field {
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png "WS/hf5.png" gamma 1.8
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}
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pigment { color Cyan }
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scale 2
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}
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\end{verbatim}
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% ------------------------------------------------
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\subsection{Trucs à voir}
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@ -107,15 +128,15 @@ celui de Gnuplot.
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\begin{verbatim}
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#declare VIRGINIA =
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transform{
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transform {
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matrix < 1, 1, 0,
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0, 1, 0,
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0, 0, 1,
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0, 0, 0 >
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}
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box{0,1
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transform{VIRGINIA}
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box { 0, 1
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transform {VIRGINIA}
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}
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\end{verbatim}
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@ -111,6 +111,12 @@ changer la dimension de l'image. En détail, j'ai pas tout compris.
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% ------------------------------------------
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\subsection{Trucs}
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convert -average frame*.png output.png
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% ------------------------------------------
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\subsection{Ressources}
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Le futur livre de Brunus. Réclamez les prmiers drafts dans
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@ -10,4 +10,4 @@ TP Link
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Archer C7
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\end{verbatim}
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http://sven.stormbind.net/blog/posts/deb\_qemu\_local\_openwrt/
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@ -2,6 +2,8 @@
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\label{S-lang}
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\index{S-lang}
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% ----------------------------------------------------------
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\section{C'est quoi ?}
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S-lang est une bibliothèque de fonctions multi-plateforme
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@ -13,6 +15,8 @@ L'exemple le plus éblouissant étant le célèbre
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longuement dans les pages consacrées à Usenet\index{Usenet}
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(page \pageref{slrn}).
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% ----------------------------------------------------------
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\section{slsh}
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\index{slsh}
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@ -40,3 +44,4 @@ tth@plop:~/Essais/Slang$
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Cool...
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% ----------------------------------------------------------
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@ -154,7 +154,7 @@ Elle supporte une grande variété de formats.
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La configuration se fait par deux fichiers :
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\texttt{/etc/libao.conf} surchargeable par
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\texttt{\$HOME/.libao.conf}, et scématiquement, nous pouvons
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\texttt{\$HOME/.libao.conf}, et schématiquement, nous pouvons
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voir qu'elle est à deux niveaux.
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https://www.xiph.org/ao/doc/drivers.html
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@ -0,0 +1,62 @@
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%
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%
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%
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\chapter{Web servers}
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% ==============================================================
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\section{Apache} \index{Apache}
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Le grand classique.
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% ==============================================================
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\section{Lighttpd} \index{Lighttpd}
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Un outsider ?
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\begin{verbatim}
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root@ramen:~# lighty-enable-mod userdir
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Enabling userdir: ok
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Run "service lighttpd force-reload" to enable changes
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root@ramen:~# service lighttpd force-reload
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root@ramen:~#
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\end{verbatim}
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% ==============================================================
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\section{Custom made}
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\begin{verbatim}
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tth@ramen:~/Houba/Fractales90$ apt show libmicrohttpd12
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Package: libmicrohttpd12
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Version: 0.9.72-2
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Priority: optional
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Section: libs
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Source: libmicrohttpd
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Maintainer: Daniel Baumann <daniel.baumann@progress-linux.org>
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Installed-Size: 211 kB
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Depends: libc6 (>= 2.17), libgnutls30 (>= 3.7.0)
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Homepage: https://www.gnu.org/software/libmicrohttpd/
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Tag: role::shared-lib
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Download-Size: 109 kB
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APT-Sources: http://deb.debian.org/debian bullseye/main amd64 Packages
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Description: library embedding HTTP server functionality
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GNU libmicrohttpd is a small C library that is supposed to make it
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easy to run an HTTP server as part of another application.
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Key features that distinguish GNU Libmicrohttpd from other
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projects are:
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* C library: fast and small
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* API is simple, expressive and fully reentrant
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* Implementation is HTTP 1.1 compliant
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* HTTP server can listen on multiple ports
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* Four different threading models (select, poll, pthread, thread pool)
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* Support for IPv6
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* Support for SHOUTcast
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* Support for incremental processing of POST data (optional)
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* Support for basic and digest authentication (optional)
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* Support for SSL3 and TLS
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\end{verbatim}
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% ==============================================================
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@ -0,0 +1,45 @@
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/*
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*
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* spy_getenv.so: spy_getenv.c Makefile
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* gcc -Wall -shared -fPIC $< -ldl -o $@
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*
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*/
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#include <stdio.h>
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#include <string.h>
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#include <unistd.h>
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#define __USE_GNU
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#include <dlfcn.h>
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typedef char * (*original_getenv)(const char *envname);
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char *getenv(char *envname)
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{
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static char *arrow = "--getenv--> ";
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static char *wtf = " --> (nil)";
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char *content;
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original_getenv orig_getenv;
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orig_getenv = (original_getenv)dlsym(RTLD_NEXT, "getenv");
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write(STDERR_FILENO, arrow, strlen(arrow));
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write(STDERR_FILENO, envname, strlen(envname));
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content = orig_getenv(envname);
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if (NULL != content) {
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write(STDERR_FILENO, "=", 1);
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write(STDERR_FILENO, content, strlen(content));
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}
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else {
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write(STDERR_FILENO, wtf, strlen(wtf));
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}
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write(STDERR_FILENO, "\n", 1);
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return content;
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}
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/* j'adore quand un plan se déroule sans accrc */
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4
main.tex
4
main.tex
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@ -139,7 +139,6 @@ en ligne sur le site du Tetalab. Your mileage may vary\dots
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\input{chap/plugins}
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\input{chap/Bonjour}
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\input{chap/ioctl}
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\input{chap/debug}
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\input{chap/buzybox}
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\input{chap/gif89a}
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@ -148,11 +147,12 @@ en ligne sur le site du Tetalab. Your mileage may vary\dots
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\input{chap/Usenet}
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\input{chap/DNS}
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\input{chap/ssh}
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\input{chap/webserver}
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\input{chap/hardware}
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\input{chap/gadgets}
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\input{chap/sdr}
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% \input{chap/slang}
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\input{chap/slang}
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\input{chap/curses}
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\input{chap/openwrt}
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\input{chap/WiFi}
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