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feat: basic flags

This commit is contained in:
gbrochar 2024-10-14 21:56:32 +02:00
parent 1a78d07f27
commit 0451a89dce
6 changed files with 184 additions and 24 deletions
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12
inc/ft_nm.h
View File

@ -16,8 +16,8 @@
# define FT_NM_FAILURE -1
typedef enum e_verbosity {
DEFAULT_VERBOSITY,
ALL,
DEFAULT_VERBOSITY,
GLOBAL,
UNDEFINED
} t_verbosity;
@ -28,6 +28,12 @@ typedef enum e_ordering {
NOSORT
} t_ordering;
typedef struct s_entry {
t_verbosity verbosity;
char *string;
char *symbol;
} t_entry;
typedef struct s_env {
char *bin_name;
t_verbosity verbosity;
@ -50,8 +56,10 @@ void *fetch(t_mapped_file mapped_file, size_t offset, size_t fetch_size);
int nm32(t_mapped_file mapped_file);
int nm64(t_mapped_file mapped_file);
int nm64(t_mapped_file mapped_file, char *path, t_verbosity verbosity, t_ordering ordering);
int get_header64(t_mapped_file mapped_file, Elf64_Ehdr *header);
char ft_get_hex_digit(char c);
#endif

2
libft

@ -1 +1 @@
Subproject commit a9a3c473d5898d1eacfe2c036266fe0f810b0b53
Subproject commit 1cab2379213f62f814312dc2cc7b0f3aa65268fc

8
src/ft_printf.c
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@ -1,5 +1,13 @@
#include "ft_nm.h"
char ft_get_hex_digit(char c) {
if (c > 9) {
return c + 'W';
} else {
return c + '0';
}
}
void ft_print_hex_digit(char c) {
if (c > 9) {
ft_putchar(c + 'W');

11
src/main.c
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@ -28,7 +28,7 @@ int parse_options(char *options, t_env *env, bool *use_options) {
return -2;
break;
case 'a':
if (env->verbosity < ALL)
if (env->verbosity < ALL || env->verbosity == DEFAULT_VERBOSITY)
env->verbosity = ALL;
break;
case 'g':
@ -58,6 +58,7 @@ int parse_arguments(int ac, char **av, t_env *env) {
bool use_options = true;
if (ac > 0) {
env->bin_name = ft_strdup(av[0]);
env->bin_name = ft_strdup("nm");
}
for (int i = 1; i < ac; i++) {
if (ft_strlen(av[i]) > 0 && av[i][0] == '-' && use_options) {
@ -76,7 +77,7 @@ int parse_arguments(int ac, char **av, t_env *env) {
return 0;
}
int nm(char *path) {
int nm(char *path, t_verbosity verbosity, t_ordering ordering) {
int fd = open(path, O_RDONLY);
if (fd == -1) {
ft_nm_error(path);
@ -111,7 +112,7 @@ int nm(char *path) {
}
}
else if (ident[EI_CLASS] == ELFCLASS64) {
if (nm64(mapped_file) == FT_NM_FAILURE) {
if (nm64(mapped_file, path, verbosity, ordering) == FT_NM_FAILURE) {
ft_printf("sss", "nm: ", path, ": file format not recognized\n");
return 0;
}
@ -135,12 +136,12 @@ int main(int ac, char **av) {
return error;
}
if (env.list_len == 1) {
nm(env.list->content);
nm(env.list->content, env.verbosity, env.ordering);
return 0;
}
while (env.list) {
ft_printf("\ns:\n", env.list->content);
nm(env.list->content);
nm(env.list->content, env.verbosity, env.ordering);
env.list = env.list->next;
}
return 0;

105
src/nm.c
View File

@ -5,7 +5,6 @@ void print_section(Elf64_Shdr sec);
void print_symbol(Elf64_Sym sym);
char *get_sym_char(Elf64_Sym sym, Elf64_Shdr sec) {
//ppp(sym, sec);
// if ((sec.sh_flags & SHF_COMPRESSED) == SHF_COMPRESSED) {
// return ("N");
// }
@ -104,7 +103,7 @@ char *get_sym_char(Elf64_Sym sym, Elf64_Shdr sec) {
}
}
if (sym.st_shndx == SHN_UNDEF) {
//return ("U");
//return ("U");
if (ELF64_ST_BIND(sym.st_info) == STB_LOCAL) {
return ("u");
}
@ -140,34 +139,59 @@ char *get_sym_char(Elf64_Sym sym, Elf64_Shdr sec) {
return ("n");
}
int nm64(t_mapped_file mapped_file) {
int strcmp_nm(t_list *a, t_list *b) {
(void)a;
(void)b;
return 1;
}
int reverse(t_list *a, t_list *b) {
return strcmp_nm(b, a);
}
int nosort(t_list *a, t_list *b) {
(void)a;
(void)b;
return -1;
}
int nm64(t_mapped_file mapped_file, char *path, t_verbosity verbosity, t_ordering ordering) {
t_list *list = NULL;
t_entry *entry = (t_entry *)malloc(sizeof(t_entry));
if (!entry)
return FT_NM_FAILURE;
Elf64_Ehdr header;
if (get_header64(mapped_file, &header) == FT_NM_FAILURE) {
return FT_NM_FAILURE;
}
uint64_t addr = header.e_shoff + header.e_shentsize * header.e_shstrndx;
Elf64_Shdr shstrtb;
ft_memcpy(&shstrtb, mapped_file.ptr + addr, header.e_shentsize);
shstrtb = *(Elf64_Shdr *)fetch(mapped_file, addr, header.e_shentsize);
for (int i = 0; i < header.e_shnum; i++) {
uint64_t addr = header.e_shoff + header.e_shentsize * i;
Elf64_Shdr sh;
ft_memcpy(&sh, mapped_file.ptr + addr, header.e_shentsize);
sh = *(Elf64_Shdr *)fetch(mapped_file, addr, header.e_shentsize);
if (sh.sh_type == SHT_SYMTAB) {
uint64_t addr2 = header.e_shoff + header.e_shentsize * sh.sh_link;
Elf64_Shdr strtab;
ft_memcpy(&strtab, mapped_file.ptr + addr2, header.e_shentsize);
strtab = *(Elf64_Shdr *)fetch(mapped_file, addr2, header.e_shentsize);
char first = *(char *)fetch(mapped_file, strtab.sh_offset, 1);
char last = *(char *)fetch(mapped_file, strtab.sh_offset + strtab.sh_size - 1, 1);
if (first != '\0' || last != '\0') {
return FT_NM_FAILURE;
}
for (uint64_t j = sh.sh_entsize; j < sh.sh_size; j += sh.sh_entsize) {
Elf64_Sym sym;
Elf64_Shdr sec;
ft_memcpy(&sym, mapped_file.ptr + sh.sh_offset + j, sh.sh_entsize);
sym = *(Elf64_Sym *)fetch(mapped_file, sh.sh_offset + j, sh.sh_entsize);
if (sym.st_shndx < header.e_shnum) {
ft_memcpy(&sec, mapped_file.ptr + header.e_shoff + header.e_shentsize * sym.st_shndx, header.e_shentsize);
sec = *(Elf64_Shdr *)fetch(mapped_file, header.e_shoff + header.e_shentsize * sym.st_shndx, header.e_shentsize);
}
char *str;
char *sec_str;
Elf64_Shdr shdr;
if (sym.st_shndx != SHN_ABS) {
ft_memcpy(&shdr, mapped_file.ptr + header.e_shoff + header.e_shentsize * sym.st_shndx, header.e_shentsize);
shdr = *(Elf64_Shdr *)fetch(mapped_file, header.e_shoff + header.e_shentsize * sym.st_shndx, header.e_shentsize);
sec_str = ft_strdup(mapped_file.ptr + shstrtb.sh_offset + shdr.sh_name);
} else {
sec_str = ft_strdup("");
@ -178,26 +202,83 @@ int nm64(t_mapped_file mapped_file) {
else {
str = sec_str;
}
// ici la str (le symbole) est bon, on la charge dans le truc, ensuite on genere la vrai string a afficher, avant de sort
entry->symbol = ft_strdup(str);
free(str);
char *sym_char = ft_strdup(get_sym_char(sym, sec));
if (ft_strnstr(sec_str, ".debug", 6) && ft_strequ(sym_char, "n")) {
free(sym_char);
sym_char = ft_strdup("N");
}
// ici le sym char a ete calculer, a partir de la on determine la verbosity
// ici on fait if entry->verbosity >= verbosity, si c'est pas bon on skip toute la suite
entry->verbosity = DEFAULT_VERBOSITY;
if (sym_char[0] == 'a')
entry->verbosity = ALL;
if (sym_char[0] == 'u' || sym_char[0] == 'v' || sym_char[0] == 'w' || (sym_char[0] >= 'A' && sym_char[0] <= 'Z'))
entry->verbosity = GLOBAL;
if (sym_char[0] == 'w' || sym_char[0] == 'U')
entry->verbosity = UNDEFINED;
if (entry->verbosity >= verbosity) {
// ici on genere la string a afficher
// pad ' ' symchar ' ' symbol name \n \0
size_t entry_string_len = 16 + 1 + 1 + 1 + ft_strlen(entry->symbol) + 1 + 1;
entry->string = (char *)malloc(sizeof(char) * entry_string_len);
if (!entry->string)
return FT_NM_FAILURE;
entry->string[entry_string_len - 1] = '\0';
entry->string[entry_string_len - 2] = '\n';
entry->string[16] = ' ';
entry->string[17] = sym_char[0];
entry->string[18] = ' ';
ft_memcpy(entry->string + 19, entry->symbol, ft_strlen(entry->symbol));
if (sym.st_value) {
ft_printf("X s ss", sym.st_value, sym_char, str, "\n");
for (char i = 15; i >= 0; i--) {
entry->string[15 - i] = ft_get_hex_digit((sym.st_value >> i * 4) & 0xF);
}
} else {
if (ft_strcmp(sym_char, "U") && ft_strcmp(sym_char, "w") && ft_strcmp(sym_char, "v")) {
ft_printf("X s ss", sym.st_value, sym_char, str, "\n");
for (char i = 15; i >= 0; i--) {
entry->string[15 - i] = ft_get_hex_digit((sym.st_value >> i * 4) & 0xF);
}
} else {
ft_printf("P s ss", sym_char, str, "\n");
for (int i = 0; i < 16; i++)
entry->string[i] = ' ';
}
}
free(sym_char);
// ensuite un switch ordering avec un ft_lstinsert (pointeur sur fonction serait plus opti mais osef)
switch (ordering) {
case NOSORT:
ft_lstinsert(&list, ft_lstnew((void *)entry, sizeof(t_entry)), &nosort);
break;
case REVERSE:
ft_lstinsert(&list, ft_lstnew((void *)entry, sizeof(t_entry)), &reverse);
break;
case DEFAULT_ORDERING:
ft_lstinsert(&list, ft_lstnew((void *)entry, sizeof(t_entry)), &strcmp_nm);
break;
}
// pas de bst oops :D
fflush(stdout);
}
}
}
char *str = ft_strdup(mapped_file.ptr + shstrtb.sh_offset + sh.sh_name);
free(str);
}
// ici on affiche tout ou no symbols en cas de list vide
if (list) {
while (list) {
t_entry *my_entry = (t_entry *)list->content;
ft_putstr(my_entry->string);
list = list->next;
}
}
else {
ft_printf("sss", "nm: ", path, ": no symbols\n");
}
return FT_NM_SUCCESS;
}

62
src/old_main.c Normal file
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@ -0,0 +1,62 @@
#include "ft_nm.h"
int main(int ac, char **av) {
char *path = ft_strdup("a.out");
if (ac > 1) {
free(path);
path = ft_strdup(av[1]);
}
int fd = open(path, O_RDONLY);
if (fd == -1) {
ft_nm_error(path);
free(path);
exit (EXIT_FAILURE);
}
struct stat stat;
if (fstat(fd, &stat) == -1) {
ft_nm_error(path);
free(path);
exit (EXIT_FAILURE);
}
t_mapped_file mapped_file;
// ft_printf("sds", "file size: ", stat.st_size, "\n");
mapped_file.ptr = mmap(NULL, stat.st_size, PROT_READ, MAP_PRIVATE, fd, 0);
mapped_file.size = stat.st_size;
if (mapped_file.ptr != MAP_FAILED) {
void *ident_ptr = fetch(mapped_file, 0, EI_NIDENT);
unsigned char ident[EI_NIDENT];
if (!ident_ptr) {
ft_printf("sss", "nm: ", path, ": file format not recognized\n");
free(path);
exit(EXIT_FAILURE);
}
ft_memcpy(ident, ident_ptr, EI_NIDENT);
if (check_ident(ident) == FT_NM_FAILURE) {
ft_printf("sss", "nm: ", path, ": file format not recognized\n");
free(path);
exit(EXIT_FAILURE);
}
if (ident[EI_CLASS] == ELFCLASS32) {
if (nm32(mapped_file) == FT_NM_FAILURE) {
ft_printf("sss", "nm: ", path, ": file format not recognized\n");
free(path);
exit(EXIT_FAILURE);
}
}
else if (ident[EI_CLASS] == ELFCLASS64) {
if (nm64(mapped_file) == FT_NM_FAILURE) {
ft_printf("sss", "nm: ", path, ": file format not recognized\n");
free(path);
exit(EXIT_FAILURE);
}
}
}
free(path);
return 0;
}