dl_hooks.c

#include "common.h"
#include "config.h"
#include <dlfcn.h>
#include <sys/types.h>
#include "hooks.h"


void *(*enhancer_real_dlopen)(const char *filename, int flag)=NULL;
int (*enhancer_real_dlclose)(void *handle)=NULL;

void *enhancer_dlopen(const char *filename, int flag)
{
    if (! enhancer_real_dlopen) return(NULL);
    return(enhancer_real_dlopen(filename, flag));
}

void *dlopen(const char *path, int flags)
{
    char *Redirect=NULL;
    int Flags;
    void *handle;

    if (! enhancer_real_dlopen) enhancer_get_real_functions();

    Flags=enhancer_checkconfig_with_redirect(FUNC_DLOPEN, "dlopen", path, "", flags, 0, &Redirect);

    if ( (Flags & FLAG_DENY) || (enhancer_real_dlopen == NULL) )
    {
        destroy(Redirect);
        return(NULL);
    }

    if (! strvalid(Redirect)) Redirect=enhancer_strcpy(Redirect, path);
    handle=enhancer_real_dlopen(Redirect, flags);
    destroy(Redirect);

    return(handle);
}




int dlclose(void *handle)
{
    int Flags;

    if (! enhancer_real_dlclose) enhancer_get_real_functions();

    Flags=enhancer_checkconfig_default(FUNC_DLCLOSE, "dlclose", "", "", 0, 0);
    if (Flags & FLAG_DENY) return(-1);
    if (Flags & FLAG_PRETEND) return(0);

    return(enhancer_real_dlclose(handle));
}



void enhancer_dl_hooks()
{
    if (! enhancer_real_dlopen) enhancer_real_dlopen = dlsym(RTLD_NEXT, "dlopen");
    if (! enhancer_real_dlclose) enhancer_real_dlclose = dlsym(RTLD_NEXT, "dlclose");
}