mini_loader.h

#ifndef MINI_LOADER_EXTERNAL_DEFS
#define MINI_LOADER_EXTERNAL_DEFS

/*
    This file contain external defines for the mini loader
*/
#define MAX_NUMBER_OF_HOOKS 1

/*
    Loader functions typedefs
*/
typedef int STATUS;


struct elf_information_struct {
    size_t elf_header_size;
    size_t loader_size;
};

struct hook {
    size_t relative_address;
    size_t attributes_size;
    size_t shellcode_size;
};

struct mini_loader_hooks_descriptor { 
    size_t size_of_hook_shellcode_data;
    struct hook startup_hooks[MAX_NUMBER_OF_HOOKS];
    struct hook pre_relocate_write_hooks[MAX_NUMBER_OF_HOOKS];
    struct hook pre_relocate_execute_hooks[MAX_NUMBER_OF_HOOKS];
    struct hook pre_calling_shellcode_main_hooks[MAX_NUMBER_OF_HOOKS];

};

struct loader_function_descriptor {
    size_t loader_handle_relocation_table;
    size_t loader_call_main;
};
struct relocation_table {
    size_t magic;
    size_t version_and_fatures;
    size_t padding;
    size_t total_size;
    size_t header_size;
    size_t padding_between_table_and_loader;
    struct elf_information_struct elf_information;
    struct loader_function_descriptor functions;
#ifdef SUPPORT_HOOKS
    struct mini_loader_hooks_descriptor hook_descriptor;
#endif
};
void loader_main(
    int argc,
    char ** argv,
    char ** envp,
    size_t loader_magic);

int get_elf_information(struct relocation_table ** info);
// External defines
#define OK 1
#define ERROR -1

/* 
    The following are the possible error codes returned from the mini loader
*/
#define MAGIC_NOT_FOUND (1 << 1)
#define INVALID_MAGIC (1 << 2)
#define INVALID_ATTRIBUTE (1 << 3)
#define RELOCATION_ERROR (1<<4)


/*
    Define addresses in the mini loader
*/
struct addresses {
    size_t base_address;
    size_t loader_base;
    size_t hooks_base_address;
};

#endif // MINI_LOADER_EXTERNAL_DEFS