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# libcontra
LIBrary for CONnection TRAcking
## dependencies
In order to build this package including documentation you need to
apt install doxygen texlive-binaries texlive-latex-base texlive-latex-recommended
apt install pdflatex imagemagick cppcheck clazy
## building
In order to not interfere with the sources use an external build directory
rm -rf build; mkdir build; cd build; cmake ..; make
## testing
cd build; ctest -V; cd ..
cd build; make test; cd ..
## usage
After building the library it is available in
~/git/devel/libcontra/build/libcontra/src/libcontra.so
You can use it to track firefox by simply doing:
export LD_PRELOAD=~/git/devel/libcontra/build/libcontra/src/libcontra.so
firefox
Of course you won't see anything yet. There are other environment variables that control the amount of output you see:
CONTRA_LOG_STDIO true or yes / false or no
default: false
see output on stdio
CONTRA_LOG_LEVEL integer between 0 and 4
default: 0
0 show nothing
1 only show error messages
2 show warning messages
3 show info messages
4 show debug messages
CONTRA_LOG_FUNCTIONS string = name of function to be logged
default: nothing
for example "connect:socket" creates output for all calls to connect() and socket()
the value "all" creates output for all functions
CONTRA_CONFIG_RESOLVE true or yes / false or no
default: false
log functions that are used during DNS access as well
CONTRA_LOG_FILE filename to write messages
default: NIL
write log messages to this file as well
At least I was a bit surprised to see the output of:
CONTRA_LOG_STDIO=yes CONTRA_LOG_LEVEL=4 CONTRA_LOG_FUNCTIONS=connect CONTRA_LOG_FILE=/tmp/firefox.log CONTRA_CONFIG_RESOLVE=yes firefox
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