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refactor

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This commit is contained in:
Gregory 2019-07-20 15:42:21 +03:00
parent 0ef5073711
commit 5b0cd41383
7 changed files with 276 additions and 204 deletions
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60
inc/ft_nm.h
View file

@ -6,15 +6,15 @@
/* By: gtertysh <gtertysh@student.unit.ua> +#+ +:+ +#+ */ /* By: gtertysh <gtertysh@student.unit.ua> +#+ +:+ +#+ */
/* +#+#+#+#+#+ +#+ */ /* +#+#+#+#+#+ +#+ */
/* Created: 2019/05/06 22:37:16 by foton #+# #+# */ /* Created: 2019/05/06 22:37:16 by foton #+# #+# */
/* Updated: 2019/05/06 22:40:14 by gtertysh ### ########.fr */ /* Updated: 2019/07/20 15:38:47 by gtertysh ### ########.fr */
/* */ /* */
/* ************************************************************************** */ /* ************************************************************************** */
#ifndef FT_NM_H #ifndef FT_NM_H
# define FT_NM_H #define FT_NM_H
# include <mach-o/loader.h> #include <mach-o/loader.h>
# include <mach-o/nlist.h> #include <mach-o/nlist.h>
typedef struct load_command t_load_command; typedef struct load_command t_load_command;
typedef struct mach_header_64 t_mach_header_64; typedef struct mach_header_64 t_mach_header_64;
@ -23,4 +23,56 @@ typedef struct segment_command_64 t_segment_command_64;
typedef struct nlist_64 t_nlist_64; typedef struct nlist_64 t_nlist_64;
typedef struct section_64 t_section_64; typedef struct section_64 t_section_64;
typedef struct s_nm_file
{
void *file;
uint32_t size;
int fd;
} t_nm_file;
typedef struct s_nm_mach_64
{
t_mach_header_64 *header;
t_load_command *commands;
t_symtab_command *symbol_table_command;
t_nlist_64 *symbol_table;
char *string_table;
} t_nm_mach_64;
void init_file
(
t_nm_file *file
);
void open_file
(
const char *filename,
t_nm_file *file
);
void close_file
(
t_nm_file *file
);
void macho64
(
t_nm_file *file
);
t_symtab_command *find_symbol_table_command
(
t_load_command *lc,
uint32_t count
);
void print_addr
(
void *addr
);
#endif #endif

6
meson.build
View file

@ -28,7 +28,11 @@ inc = include_directories('inc')
install_headers('inc/ft_nm.h') install_headers('inc/ft_nm.h')
sources = [ sources = [
'src/main.c' 'src/main.c',
'src/nm_file.c',
'src/macho64.c',
'src/print_address.c',
'src/find_symbol_table_command.c',
] ]
libft = subproject('libft') libft = subproject('libft')

26
src/find_symbol_table_command.c Normal file
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@ -0,0 +1,26 @@
#include "ft_nm.h"
#include "stddef.h"
t_symtab_command *find_symbol_table_command
(
t_load_command *lc,
uint32_t count
)
{
uint32_t i;
t_symtab_command *sym_tab;
sym_tab = NULL;
i = 0;
while(i < count)
{
if (lc->cmd == LC_SYMTAB)
{
sym_tab = (t_symtab_command *)lc;
break;
}
lc = (t_load_command *)((uintptr_t)lc + lc->cmdsize);
i++;
}
return sym_tab;
}

105
src/macho64.c Normal file
View file

@ -0,0 +1,105 @@
#include "ft_nm.h"
#include "libft.h"
#include <stddef.h>
t_section_64 *find_section
(
t_nm_mach_64 *mach64,
uint32_t index
)
{
uint32_t i;
uint32_t acc;
t_load_command *lc;
t_section_64 *sections;
t_segment_command_64 *segment;
lc = mach64->commands;
acc = 0;
i = 0;
while(i < mach64->header->ncmds)
{
if (lc->cmd == LC_SEGMENT_64)
{
segment = (t_segment_command_64 *)lc;
if (segment->nsects + acc >= index)
{
sections = (t_section_64 *)((uintptr_t)segment +
sizeof(t_segment_command_64));
return (sections + index - acc - 1);
}
acc += segment->nsects;
}
lc = (t_load_command *)((uintptr_t)lc + lc->cmdsize);
i++;
}
return NULL;
}
void print_symbol_table(t_nm_mach_64 *mach64)
{
uint32_t j;
t_nlist_64 symbol;
t_section_64 *section;
j = 0;
while(j < mach64->symbol_table_command->nsyms)
{
symbol = mach64->symbol_table[j];
int type = symbol.n_type & N_TYPE;
int external = symbol.n_type & N_EXT;
int debug = (symbol.n_type & N_STAB) != 0;
int offset = external ? 0 : 32;
char *name = mach64->string_table + symbol.n_un.n_strx;
if (debug)
{
j++;
continue;
}
// some shit herustic should be used
// to determine to print address or not
if (symbol.n_value)
print_addr((void *)symbol.n_value);
else
ft_putstr(" ");
ft_putchar(' ');
if (type == N_UNDF)
ft_putchar('U' + offset);
if (type == N_ABS)
ft_putchar('A' + offset);
if (type == N_SECT)
{
// lookup in which section symbol is located
section = find_section(mach64, symbol.n_sect);
if(ft_strcmp(SECT_TEXT, section->sectname) == 0)
ft_putchar('T' + offset);
else if(ft_strcmp(SECT_DATA, section->sectname) == 0)
ft_putchar('D' + offset);
else if(ft_strcmp(SECT_BSS, section->sectname) == 0)
ft_putchar('B' + offset);
else
ft_putchar('S' + offset);
}
ft_putchar(' ');
ft_putstr(name);
ft_putstr("\n");
j++;
}
}
void macho64(t_nm_file *file)
{
t_nm_mach_64 mach64;
mach64.header = (t_mach_header_64 *)file->file;
mach64.commands = (t_load_command *)(file->file + sizeof(t_mach_header_64));
mach64.symbol_table_command = find_symbol_table_command(mach64.commands,
mach64.header->ncmds);
mach64.symbol_table = (t_nlist_64 *)
(mach64.symbol_table_command->symoff + file->file);
mach64.string_table = (char *)
(mach64.symbol_table_command->stroff + file->file);
print_symbol_table(&mach64);
}

212
src/main.c
View file

@ -3,220 +3,34 @@
/* ::: :::::::: */ /* ::: :::::::: */
/* main.c :+: :+: :+: */ /* main.c :+: :+: :+: */
/* +:+ +:+ +:+ */ /* +:+ +:+ +:+ */
/* By: gtertysh <marvin@42.fr> +#+ +:+ +#+ */ /* By: gtertysh <gtertysh@student.unit.ua> +#+ +:+ +#+ */
/* +#+#+#+#+#+ +#+ */ /* +#+#+#+#+#+ +#+ */
/* Created: 2019/07/13 14:52:27 by gtertysh #+# #+# */ /* Created: 2019/07/13 14:52:27 by gtertysh #+# #+# */
/* Updated: 2019/07/13 14:52:29 by gtertysh ### ########.fr */ /* Updated: 2019/07/20 15:21:14 by gtertysh ### ########.fr */
/* */ /* */
/* ************************************************************************** */ /* ************************************************************************** */
#include "libft.h" #include "libft.h"
#include "ft_nm.h" #include "ft_nm.h"
#include <fcntl.h>
#include <sys/stat.h>
#include <stdio.h>
#include <mach-o/loader.h>
#include <mach-o/nlist.h>
static void print_addr(void *addr)
{
size_t i;
size_t bit_4;
size_t count;
count = sizeof(addr) * 2;
i = 0;
while (i < count)
{
bit_4 = ((size_t)addr >> ((count - i - 1) * 4)) & 0xf;
if (bit_4 < 10)
ft_putnbr(bit_4);
else
ft_putchar('a' + bit_4 - 10);
i++;
}
}
void open_file(const char *filename, int *fd, char **file)
{
struct stat stat_buff;
*fd = open(filename, O_RDONLY);
if (*fd == -1)
{
ft_putstr("can't open file\n");
exit(1);
}
stat(filename, &stat_buff);
if (!S_ISREG(stat_buff.st_mode))
{
ft_putstr("not a regular file\n");
close(*fd);
exit(1);
}
*file = NULL;
*file = malloc(stat_buff.st_size);
if (!*file)
{
ft_putstr("can't allocate memory\n");
close(*fd);
exit(1);
}
read(*fd, *file, stat_buff.st_size);
}
void close_file(int fd, char *file)
{
close(fd);
free(file);
}
t_symtab_command *find_symbol_table_command(t_load_command *lc, uint32_t count)
{
uint32_t i;
t_symtab_command *sym_tab;
sym_tab = NULL;
i = 0;
while(i < count)
{
if (lc->cmd == LC_SYMTAB)
{
sym_tab = (t_symtab_command *)lc;
break;
}
lc = (t_load_command *)((uintptr_t)lc + lc->cmdsize);
i++;
}
return sym_tab;
}
t_section_64 *find_section(t_load_command *lc, uint32_t cmd_num, uint32_t section)
{
uint32_t i;
uint32_t acc;
t_section_64 *sections;
t_segment_command_64 *segment;
acc = 0;
i = 0;
while(i < cmd_num)
{
if (lc->cmd == LC_SEGMENT_64)
{
segment = (t_segment_command_64 *)lc;
if (segment->nsects + acc >= section)
{
sections = (t_section_64 *)((uintptr_t)segment + sizeof(t_segment_command_64));
return (sections + section - acc - 1);
}
acc += segment->nsects;
}
lc = (t_load_command *)((uintptr_t)lc + lc->cmdsize);
i++;
}
return NULL;
}
void print_symbol_table(t_symtab_command *symtab_cmd, char *file, t_load_command *load_commands, uint32_t cmd_num)
{
uint32_t j;
t_nlist_64 *symbol_table;
t_nlist_64 symbol;
t_section_64 *section;
char *string_table;
string_table = file + symtab_cmd->stroff;
symbol_table = (t_nlist_64 *)(file + symtab_cmd->symoff);
j = 0;
while(j < symtab_cmd->nsyms)
{
symbol = symbol_table[j];
int type = symbol.n_type & N_TYPE;
int external = symbol.n_type & N_EXT;
int debug = (symbol.n_type & N_STAB) != 0;
int offset = external ? 0 : 32;
char *name = string_table + symbol.n_un.n_strx;
if (debug)
{
j++;
continue;
}
// some shit herustic should be used
// to determine to print address or not
if (symbol.n_value)
print_addr((void *)symbol.n_value);
else
ft_putstr(" ");
ft_putchar(' ');
if (type == N_UNDF)
ft_putchar('U' + offset);
if (type == N_ABS)
ft_putchar('A' + offset);
if (type == N_SECT)
{
// lookup in which section symbol is located
section = find_section(load_commands, cmd_num, symbol.n_sect);
if(ft_strcmp(SECT_TEXT, section->sectname) == 0)
ft_putchar('T' + offset);
else if(ft_strcmp(SECT_DATA, section->sectname) == 0)
ft_putchar('D' + offset);
else if(ft_strcmp(SECT_BSS, section->sectname) == 0)
ft_putchar('B' + offset);
else
ft_putchar('S' + offset);
ft_putchar(' ');
ft_putnbr(symbol.n_sect);
}
ft_putchar(' ');
ft_putstr(name);
ft_putstr("\n");
j++;
}
}
void handle_64(char *file)
{
t_mach_header_64 *hdr;
t_load_command *load_commands;
t_symtab_command *symtab_cmd;
// t_section_64 *sections;
// t_segment_command_64 *segment_cmd;
hdr = (t_mach_header_64 *)file;
load_commands = (t_load_command *)(file + sizeof(t_mach_header_64));
// sections = (t_section_64 *)(file + hdr->sizeofcmds + sizeof(t_mach_header_64));
symtab_cmd = find_symbol_table_command(load_commands, hdr->ncmds);
print_symbol_table(symtab_cmd, file, load_commands, hdr->ncmds);
}
void handle_32(char *file)
{
(void)file;
ft_putstr("TODO\n");
}
void hanldle_file(const char *filename) void hanldle_file(const char *filename)
{ {
char *file; t_nm_file file;
int fd; uint32_t magic;
open_file(filename, &fd, &file);
uint32_t magic;
magic = *(uint32_t *)file;
init_file(&file);
open_file(filename, &file);
magic = *(uint32_t *)file.file;
if (magic == MH_MAGIC_64) if (magic == MH_MAGIC_64)
handle_64(file); macho64(&file);
else if (magic == MH_MAGIC) // else if (magic == MH_MAGIC)
handle_64(file); // handle_32(file);
else if (magic == MH_CIGAM || magic == MH_CIGAM_64) // else if (magic == MH_CIGAM || magic == MH_CIGAM_64)
ft_putstr("do not support big endian binaries."); // ft_putstr("do not support big endian binaries.");
else else
ft_putstr("invalid magic number."); ft_putstr("invalid magic number.");
close_file(fd, file); close_file(&file);
} }
int main(int argc, char **argv) int main(int argc, char **argv)

49
src/nm_file.c Normal file
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@ -0,0 +1,49 @@
#include "ft_nm.h"
#include "libft.h"
#include <stdlib.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <stddef.h>
#include <sys/mman.h>
#include <stdio.h>
void init_file(t_nm_file *file)
{
file->fd = -1;
file->file = NULL;
file->size = 0;
}
void open_file(const char *filename, t_nm_file *file)
{
struct stat stat_buff;
file->fd = open(filename, O_RDONLY);
if (file->fd == -1)
{
ft_putstr("can't open file\n");
exit(1);
}
stat(filename, &stat_buff);
if (!S_ISREG(stat_buff.st_mode))
{
ft_putstr("not a regular file\n");
close(file->fd);
exit(1);
}
file->size = stat_buff.st_size;
file->file = mmap(0, file->size, PROT_READ, MAP_PRIVATE, file->fd, 0);
if (file->file == MAP_FAILED)
{
perror("can't mmap file");
close(file->fd);
exit(1);
}
}
void close_file(t_nm_file *file)
{
close(file->fd);
munmap(file->file, file->size);
}

22
src/print_address.c Normal file
View file

@ -0,0 +1,22 @@
#include "ft_nm.h"
#include "libft.h"
#include <stddef.h>
void print_addr(void *addr)
{
size_t i;
size_t bit_4;
size_t count;
count = sizeof(addr) * 2;
i = 0;
while (i < count)
{
bit_4 = ((size_t)addr >> ((count - i - 1) * 4)) & 0xf;
if (bit_4 < 10)
ft_putnbr(bit_4);
else
ft_putchar('a' + bit_4 - 10);
i++;
}
}