Hi ;)
I have succesfully using dyld -macosx- to interpose standard C functions to a third party application, getting important information about the workarounds it does. But what I really need is to replace a certain function of a certain class.
The function I want to override is QString::append(..., ..., ...), so each time a string is appended to another -the whole application uses qstring-, i find out.
Is there a way? Here's the code I already have.
// libinterposers.c
#include <stdio.h>
#include <stdint.h>
#include <unistd.h>
#include <fcntl.h>
#include <stdarg.h>
#include <dlfcn.h>
#include <stdlib.h>
typedef struct interpose_s {
void *new_func;
void *orig_func;
} interpose_t;
int my_open(const char *, int, mode_t);
int my_close(int);
void* my_malloc(size_t);
static const interpose_t interposers[] \
__attribute__ ((section("__DATA, __interpose"))) = {
{ (void *)my_open, (void *)open },
{ (void *)my_close, (void *)close },
{ (void *)my_malloc, (void *)malloc },
};
int
my_open(const char *path, int flags, mode_t mode)
{
int ret = open(path, flags, mode);
printf("--> %d = open(%s, %x, %x)\n", ret, path, flags, mode);
return ret;
}
int
my_close(int d)
{
int ret = close(d);
printf("--> %d = close(%d)\n", ret, d);
return ret;
}
void*
my_malloc(size_t size)
{
void *ret = malloc(size);
//fprintf(stderr, "Reserva de memoria");
return ret;
}
Thank you very much