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Add Tristan functions #4

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Add Tristan functions #4

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71 changes: 63 additions & 8 deletions src/main.c
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Original file line number Diff line number Diff line change
Expand Up @@ -6,23 +6,68 @@

#include "../include/options.h"

typedef struct Elf64_Ehdr Elf64_Ehdr;

/**
*
*
* @param content
* @authors Maxence Puhetini, Tristant Salé
*/
void check_ELF(const char *content) {
const char elf_magic[] = {0x7F, 'E', 'L', 'F'};
if (memcmp(content, elf_magic, sizeof(elf_magic)) != 0) {
printf("not an elf, gimme an elf please\n");
exit(EXIT_FAILURE);
}
printf("That's and elf\n");
}

// Nombre d'options disponibles
// TODO: Ajouter un count de options[]
const int NB_OPTIONS = 7;

// Définition du tableau d'options
Option options[] = {
{"-d", print_text_section_hex, 1},
{"-s", print_section_count, 1},
{"-a", print_section_name_size, 1},
{"-e", print_entrypoint_address_program, 1},
{"-t", option_t, 1},
{"-l", option_l, 1},
{"-h", option_h, 0}
{"-d", (const char *) print_text_section_hex, 1},
{"-s", (const char *) print_section_count, 1},
{"-a", (const char *) print_section_name_size, 1},
{"-e", (const char *) print_entrypoint_address_program, 1},
{"-t", (const char *) option_t, 1},
{"-l", (const char *) option_l, 1},
{"-h", option_h, 0}
};

char* copy_file_to_memory(const char *file_to_open) {
FILE *file = fopen(file_to_open, "rb");
if (!file) {
perror("Erreur: impossible de lire le fichier");
return NULL;
}

char *buffer = NULL;
long file_size;
fseek(file, 0, SEEK_END);
file_size = ftell(file);
rewind(file);
buffer = (char *)malloc(file_size + 1);
if (buffer == NULL) {
perror("Erreur lors de l'allocation mémoire");
fclose(file);
return "1";
}

if (fread(buffer, 1, file_size, file) != file_size) {
perror("Erreur lors de la lecture du fichier");
free(buffer);
fclose(file);
return "1";
}

buffer[file_size] = '\0';
fclose(file);
return buffer;
}

int main(int argc, char *argv[]) {
// Vérifier que le nom du fichier ELF a été fourni
Expand All @@ -35,6 +80,16 @@ int main(int argc, char *argv[]) {
// Stocker le nom du fichier ELF
char *filename = argv[1];

char* content = copy_file_to_memory(argv[1]);
// printf("Contenu du fichier :\n%100x\n", content);
print_basic_info(argv[1]);
check_ELF(content);

Elf64_Ehdr *elf_header = malloc(sizeof(Elf64_Ehdr));
memcpy(elf_header, content, sizeof(Elf64_Ehdr));
free(content);
free(elf_header);

// Si aucun argument autre que le nom du fichier n'est passé, afficher les informations standards du fichier ELF
if (argc == 2) {
print_basic_info(filename);
Expand All @@ -57,7 +112,7 @@ int main(int argc, char *argv[]) {

if (!option_found) {
// Si l'argument ne correspond à aucune option, afficher un message d'erreur et quitter le programme
printf("Erreur : option invalide '%s'\n", argv[i]);
printf("Erreur: option invalide '%s'\n", argv[i]);
option_h();
return 1;
}
Expand Down
20 changes: 14 additions & 6 deletions src/options.c
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Original file line number Diff line number Diff line change
Expand Up @@ -6,14 +6,14 @@
#include <gelf.h>

/**
* Prints the .text section in hexadecimal
* Prints the .text sectio n in hexadecimal
* This function is called when the user passes the -d argument
*
* @param content
* @author Merieme Yaaqobi
*/
void print_text_section_hex(const char *content) {
int fd = open(nom_fichier, O_RDONLY);
int fd = open(content, O_RDONLY);
Elf *elf;
Elf_Scn *scn = NULL;
GElf_Shdr shdr;
Expand Down Expand Up @@ -60,7 +60,8 @@ void print_text_section_hex(const char *content) {
* @author Merieme Yaaqobi
*/
void print_section_count(const char *content) {
int fd = open(nom_fichier, O_RDONLY);
int fd = open(content, O_RDONLY);

Elf *elf;
size_t shnum;
if (elf_version(EV_CURRENT) == EV_NONE) {
Expand Down Expand Up @@ -89,7 +90,14 @@ void print_section_count(const char *content) {
* @author Tristan Salé
*/
void print_section_name_size(const char *content) {
printf("Option -a appelée\n");
Elf64_Shdr *section_headers = (Elf64_Shdr *)(content + elf_header.e_shoff);
char *section_names = (char *)(content + section_headers[elf_header.e_shstrndx].sh_offset);

printf("Sections:\n");
for (int i = 0; i < elf_header.e_shnum; i++) {
printf("Section %d: %s\n", i, section_names + section_headers[i].sh_name);
}
printf("Il y a %d sections dans ce fichier ELF\n", elf_header.e_shnum);
}

/**
Expand All @@ -99,8 +107,8 @@ void print_section_name_size(const char *content) {
* @param content
* @author Tristan Salé
*/
void print_entrypoint_address_program(const char *content) {
printf("Option -e appelée\n");
void print_entrypoint_address_program(const char *content, Elf64_Ehdr elf_header) {
printf("Entrypoint address: 0x%lx\n", elf_header.e_entry);
}

void option_t(const char *content) {
Expand Down