20,290
edits
Intercept dynamic library methods with LD PRELOAD: Difference between revisions
Intercept dynamic library methods with LD PRELOAD (view source)
Revision as of 12:32, 16 May 2024
, 16 Mayno edit summary
mNo edit summary |
mNo edit summary |
||
| Line 1: | Line 1: | ||
=Introduction= | ==Introduction== | ||
Let's say you have a binary called 'main' which was compiled against a shared memory 'libprint1.so', which has a method called print_msg() which prints 'hello from print1'. This looks like this | Let's say you have a binary called 'main' which was compiled against a shared memory 'libprint1.so', which has a method called print_msg() which prints 'hello from print1'. This looks like this | ||
main.c | ===main.c=== | ||
<syntaxhighlight lang="C" > | <syntaxhighlight lang="C" > | ||
#include "print.h" | #include "print.h" | ||
| Line 13: | Line 13: | ||
</syntaxhighlight> | </syntaxhighlight> | ||
print.h | ===print.h=== | ||
<syntaxhighlight lang="C" > | <syntaxhighlight lang="C" > | ||
#ifndef RR_PRINT_H | #ifndef RR_PRINT_H | ||
| Line 26: | Line 26: | ||
</syntaxhighlight> | </syntaxhighlight> | ||
print1.c | ===print1.c=== | ||
<syntaxhighlight lang="C" > | <syntaxhighlight lang="C" > | ||
#include "print.h" | #include "print.h" | ||
| Line 51: | Line 51: | ||
Let's change the message of print_msg() | Let's change the message of print_msg() | ||
print2.c | ===print2.c=== | ||
<syntaxhighlight lang="C" > | <syntaxhighlight lang="C" > | ||
#include "print.h" | #include "print.h" | ||