woody-woodpacker/srcs/woody.c

#include "../includes/woody.h"

int elf_magic_numbers(char *str)
{
	return (!ft_strncmp(str, ELFMAG, SELFMAG));
}

size_t	find_stringtable_end(char *Sshstrtab) // not secure i think
{
	size_t strtab_index = 0;

	while (Sshstrtab[strtab_index] != '\0' || Sshstrtab[strtab_index + 1] != '\0')
	{
		while (Sshstrtab[strtab_index] != '\0')
			strtab_index++;
		strtab_index++;
	}
	return strtab_index;
}

void	encrypt(char *start, unsigned long int size)
{
	size_t i = 0;

	// while (i < size)
	// {

	// }
	(void)i;
	(void)start;
	(void)size;
}

int woody(t_efl_content *file_content)
{
	Elf64_Ehdr *Ehdr = (Elf64_Ehdr *)secure_access(file_content->file, file_content->file_size, 0, sizeof(Elf64_Ehdr));

	if (!Ehdr || !elf_magic_numbers(file_content->file) || Ehdr->e_ident[EI_CLASS] != 2)
	{
		ft_printf("Error: \'%s\' is not a valid 64-bit ELF file\n", file_content->file_path);
		return EXIT_FAILURE;
	}

	Elf64_Shdr *Shdr = (Elf64_Shdr *)secure_access(file_content->file, file_content->file_size, Ehdr->e_shoff, sizeof(Elf64_Shdr));
	if (Shdr == NULL || !secure_access(file_content->file, file_content->file_size, Ehdr->e_shoff, Ehdr->e_shnum * sizeof(Elf64_Shdr)))
	{
		return ft_put_error("Corrupted file");
	}
	if (file_content->file_size > Ehdr->e_shoff + Ehdr->e_shnum * sizeof(Elf64_Shdr))
	{
		printf("extra_data !\n"); // save it in file_content->extra_data and append it to the end of the woody file ? Could be dangerous
	}

	char *Sshstrtab = (char *)secure_access(file_content->file, file_content->file_size, Shdr[Ehdr->e_shstrndx].sh_offset, 0);
	if (Sshstrtab == NULL)
		return ft_put_error("Corrupted file");

	size_t stringtable_end = find_stringtable_end(Sshstrtab);
	
	if (Sshstrtab + stringtable_end > file_content->file + file_content->file_size)
	{
		return ft_put_error("Encrypt after the end of the file");
	}
	encrypt(Sshstrtab, stringtable_end);

	return EXIT_SUCCESS;
}