find text section

.vscode/launch.json

@@ -5,7 +5,7 @@
     "version": "0.2.0",
     "configurations": [
         {
-            "name": "self read",
+            "name": "nm self read",
             "type": "cppdbg",
             "request": "launch",
             "program": "${workspaceFolder}/debug_bld/ft_nm",
@@ -21,7 +21,7 @@
             }
         },
         {
-            "name": "orig nm read",
+            "name": "nm orig nm read",
             "type": "cppdbg",
             "request": "launch",
             "program": "${workspaceFolder}/debug_bld/ft_nm",
@@ -37,7 +37,7 @@
             }
 		},
 		{
-            "name": "32bin",
+            "name": "nm 32bin",
             "type": "cppdbg",
             "request": "launch",
             "program": "${workspaceFolder}/debug_bld/ft_nm",
@@ -53,7 +53,7 @@
             }
 		},
 		{
-            "name": "fat",
+            "name": "nm fat",
             "type": "cppdbg",
             "request": "launch",
             "program": "${workspaceFolder}/debug_bld/ft_nm",
@@ -69,7 +69,7 @@
             }
 		},
 		{
-            "name": "ar",
+            "name": "nm ar",
             "type": "cppdbg",
             "request": "launch",
             "program": "${workspaceFolder}/debug_bld/ft_nm",
@@ -83,6 +83,22 @@
             "osx": {
                 "MIMode": "lldb"
             }
+        },
+        {
+            "name": "otool orig nm read",
+            "type": "cppdbg",
+            "request": "launch",
+            "program": "${workspaceFolder}/debug_bld/ft_otool",
+            "args": ["/usr/bin/nm"],
+            "preLaunchTask": "build",
+            "stopAtEntry": false,
+            "cwd": "${workspaceFolder}",
+            "environment": [],
+            "externalConsole": false,
+            "MIMode": "gdb",
+            "osx": {
+                "MIMode": "lldb"
             }
+		},
     ]
 }

inc/ft_file.h

@@ -0,0 +1,28 @@
+#ifndef FT_FILE
+# define FT_FILE
+
+typedef struct						s_file
+{
+	void							*file;
+	uint32_t						size;
+	int								fd;
+}									t_file;
+
+void								init_file
+(
+	t_file *file
+);
+
+
+void								open_file
+(
+	const char *filename,
+	t_file *file
+);
+
+void								close_file
+(
+	t_file *file
+);
+
+#endif

inc/ft_nm.h

@@ -6,7 +6,7 @@
 /*   By: gtertysh <gtertysh@student.unit.ua>        +#+  +:+       +#+        */
 /*                                                +#+#+#+#+#+   +#+           */
 /*   Created: 2019/05/06 22:37:16 by foton             #+#    #+#             */
-/*   Updated: 2019/07/27 20:07:37 by gtertysh         ###   ########.fr       */
+/*   Updated: 2019/08/10 17:18:31 by gtertysh         ###   ########.fr       */
 /*                                                                            */
 /* ************************************************************************** */
 
@@ -18,6 +18,7 @@
 #include <mach-o/fat.h>
 #include <ar.h>
 #include <stddef.h>
+#include "ft_file.h"
 
 typedef struct symtab_command		t_symtab_command;
 typedef struct load_command			t_load_command;
@@ -31,19 +32,13 @@ typedef struct nlist				t_nlist_32;
 typedef struct section_64			t_section_64;
 typedef struct section				t_section_32;
 
-
-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_segment_command_64			*text_command;
+	t_section_64					*text_section;
 	t_nlist_64						*symbol_table;
 	char							*string_table;
 }									t_nm_mach_64;
@@ -53,45 +48,30 @@ typedef struct						s_nm_mach_32
 	t_mach_header_32				*header;
 	t_load_command					*commands;
 	t_symtab_command				*symbol_table_command;
+	t_segment_command_32			*text_command;
+	t_section_32					*text_section;
 	t_nlist_32						*symbol_table;
 	char							*string_table;
 }									t_nm_mach_32;
 
-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								fat
 (
-	t_nm_file *file
+	t_file *file
 );
 
 void								ar
 (
-	t_nm_file *file
+	t_file *file
 );
 
 void								macho64
 (
-	t_nm_file *file
+	t_file *file
 );
 
 void								macho32
 (
-	t_nm_file *file
+	t_file *file
 );
 
 t_symtab_command					*find_symbol_table_command
@@ -110,7 +90,4 @@ void								print_addr_32
 	size_t addr
 );
 
-
-
-
 #endif

meson.build

@@ -39,6 +39,7 @@ nm_sources = [
 ]
 
 otool_sources = [
+	'src/nm/nm_file.c',
 	'src/otool/main.c'
 ]
 
@@ -58,6 +59,6 @@ ft_nm = executable(
 	include_directories: inc,
 	dependencies: libft_dep,
 	install: true,
-)
 
+)
 #subdir('t')

src/nm/ar.c

@@ -3,12 +3,12 @@
 #include <ar.h>
 
 
-void	ar(t_nm_file *file)
+void	ar(t_file *file)
 {
 	struct ar_hdr	*runner;
 	char			*long_name;
 	size_t			offset;
-	t_nm_file		obj;
+	t_file		obj;
 
 
 	runner = file->file + SARMAG;

src/nm/fat.c

@@ -2,11 +2,11 @@
 #include "libft.h"
 #include <stdio.h>
 
-void	fat(t_nm_file *file)
+void	fat(t_file *file)
 {
 	struct fat_arch		*arch_runner;
 	struct fat_header	*header;
-	t_nm_file			arch_file;
+	t_file			arch_file;
 	uint32_t			i;
 
 	header = (struct fat_header *)file->file;

src/nm/macho32.c

@@ -89,7 +89,7 @@ static void				print_symbol_table(t_nm_mach_32 *mach32)
 	}
 }
 
-void				macho32(t_nm_file *file)
+void				macho32(t_file *file)
 {
 	t_nm_mach_32	mach32;
 

src/nm/macho64.c

@@ -89,7 +89,7 @@ static void				print_symbol_table(t_nm_mach_64 *mach64)
 	}
 }
 
-void				macho64(t_nm_file *file)
+void				macho64(t_file *file)
 {
 	t_nm_mach_64	mach64;
 

src/nm/main.c

@@ -6,7 +6,7 @@
 /*   By: gtertysh <gtertysh@student.unit.ua>        +#+  +:+       +#+        */
 /*                                                +#+#+#+#+#+   +#+           */
 /*   Created: 2019/07/13 14:52:27 by gtertysh          #+#    #+#             */
-/*   Updated: 2019/07/31 21:37:00 by gtertysh         ###   ########.fr       */
+/*   Updated: 2019/08/10 16:05:21 by gtertysh         ###   ########.fr       */
 /*                                                                            */
 /* ************************************************************************** */
 
@@ -16,7 +16,7 @@
 
 void		hanldle_file(const char *filename)
 {
-	t_nm_file	file;
+	t_file	file;
 	uint32_t	magic;
 
 	// create dispatch table for this bullshit

src/nm/nm_file.c

@@ -8,14 +8,14 @@
 #include <sys/mman.h>
 #include <stdio.h>
 
-void	init_file(t_nm_file *file)
+void	init_file(t_file *file)
 {
 	file->fd = -1;
 	file->file = NULL;
 	file->size = 0;
 }
 
-void	open_file(const char *filename, t_nm_file *file)
+void	open_file(const char *filename, t_file *file)
 {
 	struct stat stat_buff;
 
@@ -42,7 +42,7 @@ void	open_file(const char *filename, t_nm_file *file)
 	}
 }
 
-void	close_file(t_nm_file *file)
+void	close_file(t_file *file)
 {
 	close(file->fd);
 	munmap(file->file, file->size);

src/otool/main.c

@@ -1,7 +1,124 @@
+#include <mach-o/loader.h>
+#include <mach-o/fat.h>
+#include <ar.h>
+#include "ft_file.h"
+#include "ft_nm.h"
 #include "libft.h"
 
-int main()
+t_segment_command_64	*find_text_command_64
+(
+	t_load_command *lc,
+	uint32_t count
+)
 {
-    ft_putstr("hello from otool!");
+	uint32_t			i;
+	t_segment_command_64	*text_command;
+
+	text_command = NULL;
+	i = 0;
+	while(i < count)
+	{
+		if (lc->cmd == LC_SEGMENT_64 && 
+            ft_strcmp(((t_segment_command_64 *)lc)->segname, SEG_TEXT) == 0)
+		{
+			text_command = (t_segment_command_64 *)lc;
+			break;
+		}
+		lc = (t_load_command *)((uintptr_t)lc + lc->cmdsize);
+		i++;
+	}
+	return text_command;
+}
+
+t_section_64       *find_text_section_64
+(
+    t_segment_command_64 *text_segment
+)
+{
+    uint32_t        i;
+    t_section_64    *text_section;
+    t_section_64    *runner;
+
+    i = 0;
+    text_section = NULL;
+    runner = (t_section_64 *)((uintptr_t)text_segment + 
+        sizeof(t_segment_command_64));
+
+    while(i < text_segment->nsects)
+    {
+        if (ft_strcmp(runner->sectname, SECT_TEXT) == 0)
+        {
+            text_section = runner;
+            break;
+        }
+        runner = (t_section_64 *)((uintptr_t)runner + sizeof(t_section_64));
+        i++;
+    }
+    return (text_section);
+}
+
+void                print_text_64
+(
+    t_nm_mach_64    *mach64
+)
+{
+    ft_putstr(mach64->text_section->sectname);
+    ft_putstr("\n section size: ");
+    ft_putnbr(mach64->text_section->size);
+    ft_putstr("\n");
+}
+
+void                otool64(t_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.text_command = find_text_command_64(mach64.commands,
+		mach64.header->ncmds);
+    mach64.text_section = find_text_section_64(mach64.text_command);
+	print_text_64(&mach64);
+}
+
+void		hanldle_file(const char *filename)
+{
+	t_file	file;
+	uint32_t	magic;
+
+	// create dispatch table for this bullshit
+	init_file(&file);
+	open_file(filename, &file);
+	magic = *(uint32_t *)file.file;
+	if (magic == MH_MAGIC_64)
+		otool64(&file);
+	// else if (magic == MH_MAGIC)
+	// 	macho32(&file);
+	// else if (magic == FAT_CIGAM)
+	// 	fat(&file);
+	// else if (ft_strncmp(file.file, ARMAG, SARMAG) == 0)
+	// 	ar(&file);
+	else
+		ft_putstr("invalid magic number.");
+	close_file(&file);
+}
+
+int     main(int argc, char **argv)
+{
+    int     i;
+
+    if (argc == 1)
+    {
+        ft_putstr_fd("at least one file must be specified\n", STDERR_FILENO);
+        return (1);
+    }
+
+    i = 1;
+    while(i < argc)
+    {
+        ft_putstr(argv[i]);
+        ft_putstr(":\n");
+        hanldle_file(argv[i]);
+        i++;
+    }
     return (0);
 }