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thesis: Complete 2.8

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Lorenz Stechauner
2025-07-21 16:56:18 +02:00
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thesis/src/02.intercept.tex
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@@ -453,6 +453,16 @@ These other environment variables are described in the following:
By default, function calls from everywhere are intercepted.
\end{description}
The shared object currently supports intercepting the following functions:
\texttt{malloc}, \texttt{calloc}, \texttt{realloc}, \texttt{reallocarray}, \texttt{free}, \texttt{getopt}, \texttt{exit},
\texttt{read}, \texttt{pread}, \texttt{write}, \texttt{pwrite}, \texttt{close}, \texttt{sigaction}, \texttt{sem\_init},
\texttt{sem\_open}, \texttt{sem\_post}, \texttt{sem\_wait}, \texttt{sem\_trywait}, \texttt{sem\_timedwait}, \texttt{sem\_getvalue},
\texttt{sem\_close}, \texttt{sem\_unlink}, \texttt{sem\_destroy}, \texttt{shm\_open}, \texttt{shm\_unlink}, \texttt{mmap},
\texttt{munmap}, \texttt{ftruncate}, \texttt{fork}, \texttt{wait}, \texttt{waitpid}, \texttt{execl}, \texttt{execlp},
\texttt{execle}, \texttt{execv}, \texttt{execvp}, \texttt{execvpe}, \texttt{execve}, \texttt{fexecve}, \texttt{pipe},
\texttt{dup}, \texttt{dup2}, \texttt{dup3}, \texttt{socket}, \texttt{bind}, \texttt{listen}, \texttt{accept}, \texttt{connect},
\texttt{getaddrinfo}, \texttt{freeaddrinfo}, \texttt{send}, \texttt{sendto}, \texttt{sendmsg}, \texttt{recv}, \texttt{recvfrom},
\texttt{recvmsg}, \texttt{getline}, \texttt{getdelim}.
\section{\texttt{intercept} Command}\label{sec:intercept-command}
@@ -498,7 +508,25 @@ intercept [-h] [-F FUNCTIONS] [-s] [-o | -L LIBRARIES] \
\section{Example}\label{sec:intercepting-example}
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To make it easier for the reader listing \ref{lst:intercept-client} provides some recorded function calls.
Most lines had to be broken up into multiple lines for better readability.
The recorded calls stem from a program written by myself as a solution for an assignment in the Operating Systems course at university.
It is a simple HTTP client.
The program was invoked using \texttt{./intercept -o -{}- ./client http://www.complang.tuwien.ac.at/}.
The first number on each line indicates unix time with nanosecond precision.
The second and third numbers correspond to the process ID and thread ID respectively.
Each line contains either a recorded call to a function or a recorded return of a function.
After the arguments of each function call a colon (\texttt{:}) indicates the beginning of meta-information.
This information always includes the return address to where the function jumps when completed.
If available, the interpretation of the return address is also provided.
This includes the offset relative to the calling binary and a source file and line number combination if the binary was compiled using \texttt{gcc -g} or \texttt{gcc -gdwarf}.
\begin{listing}[htbp]
\inputminted[fontsize=\tiny]{text}{listings/intercept-client.txt}
\caption{Recoreded function calls from \texttt{./client}.}
\label{lst:intercept-client}
\end{listing}
\section{Analyzing Intercepted Function Calls}\label{sec:analyzing-intercepted-function-calls}
@@ -506,11 +534,6 @@ Lorem Ipsum.
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\section{Parsing Intercepted Function Calls in Python}\label{sec:parsing-intercepted-function-calls}
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\section{Automated Testing on Intercepted Function Calls}\label{sec:automated-testing-on-intercepted-function-calls}
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