refatored functions into 'dump' atoms to make for a clearer view of the Mach-O layout
This commit is contained in:
Jack Halford
parent
6319a23950
commit
0e0fda4740
4 changed files with 66 additions and 46 deletions
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@ -42,7 +42,7 @@ INDEX = 0
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all:
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@make -j $(NAME)
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$(NAME): $(OBJ_DIR) $(OBJS)
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$(NAME): $(LIBFT_LIB) $(OBJ_DIR) $(OBJS)
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@$(CC) $(FLAGS) $(D_FLAGS) \
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-I $(INC_DIR) \
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-I $(LIBFT_INC) \
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@ -72,13 +72,24 @@ clean:
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@$(RM) $(OBJ_DIR)
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@printf "\r\e[38;5;202m✖ clean $(NAME).\e[0m\e[K\n"
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cleanlib:
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@make -C $(LIBFT_DIR) clean
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fclean: clean
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@$(RM) $(NAME)
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@printf "\r\e[38;5;196m❌ fclean $(NAME).\e[0m\e[K\n"
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fcleanlib: cleanlib
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@make -C $(LIBFT_DIR) fclean
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re: fclean all
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.PHONY: all clean fclean re
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relib: fcleanlib $(LIBFT_LIB)
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$(LIBFT_LIB):
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@make -C $(LIBFT_DIR)
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.PHONY: fclean clean re relib cleanlib fcleanlib
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-include $(OBJS:.o=.d)
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@ -22,4 +22,6 @@
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# include <sys/stat.h>
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# include <stdlib.h>
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# define IS_MAGIC_64(x) (x == MH_MAGIC_64 || x == MH_CIGAM_64)
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#endif
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@ -1 +1 @@
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Subproject commit 0ca8ca817f32fc0345ef93ef74a3abe2583bd89c
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Subproject commit 5e978382fff27082681383029d99f76ae5a25ddc
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@ -12,69 +12,76 @@
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#include "ft_nm.h"
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void print_output(int nsyms, int symoff, int stroff, void *ptr)
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void dump_section_64(struct section_64* sect)
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{
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int i;
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char *stringtable;
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struct nlist_64 *array;
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ft_printf("section64: sectname=[%s] addr=[%p]\n", sect->sectname, sect->addr);
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}
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array = ptr + symoff;
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stringtable = (void*)ptr + stroff;
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for (i = 0; i < nsyms; ++i)
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void dump_segment_64(struct segment_command_64 *seg, void *file)
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{
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uint32_t nsects;
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uint32_t i;
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struct section_64 *sect;
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(void)file;
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nsects = seg->nsects;
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ft_printf("LC_SEGMENT_64: segname=[%s], nsects=[%i]\n", seg->segname, nsects);
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sect = (void*)seg + sizeof(*seg);
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for (i = 0; i < nsects; i++)
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{
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ft_printf("%s\n", stringtable + array[i].n_un.n_strx);
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dump_section_64(sect);
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sect = (void*)sect + sect->size;
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}
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}
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void handle_64(void *ptr)
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void dump_symtab(struct symtab_command *sym, void *file)
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{
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int ncmds;
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int i;
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struct mach_header_64 *header;
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struct load_command *lc;
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struct symtab_command *sym;
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int i;
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int nsyms;
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char *stringtable;
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struct nlist_64 *array;
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nsyms = sym->nsyms;
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array = file + sym->symoff;
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stringtable = (void*)file + sym->stroff;
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ft_printf("{und}LC_SYMTAB with %d symbols:{eoc}\n", sym->nsyms);
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for (i = 0; i < nsyms; ++i)
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ft_printf("%s\n", stringtable + array[i].n_un.n_strx);
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}
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void dump_load_commands(void *file)
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{
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uint32_t ncmds;
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uint32_t i;
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struct load_command *lc;
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struct mach_header_64 *header = file;
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header = (struct mach_header_64*)ptr;
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ncmds = header->ncmds;
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lc = ptr + sizeof(*header);
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lc = file + sizeof(*header);
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for (i = 0; i < ncmds; i++)
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{
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ft_printf("{yel}load_command #%d: %i{eoc}\n", i, lc->cmd);
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if (lc->cmd == LC_SYMTAB)
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{
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sym = (struct symtab_command*)lc;
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/* ft_printf("nb symbols: %d\n", sym->nsyms); */
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print_output(sym->nsyms, sym->symoff, sym->stroff, ptr);
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break ;
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}
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dump_symtab((struct symtab_command*)lc, file);
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else if (lc->cmd == LC_SEGMENT_64)
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dump_segment_64((struct segment_command_64*)lc, file);
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lc = (void*)lc + lc->cmdsize;
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}
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}
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void nm(char *ptr)
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void nm(char *file)
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{
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unsigned int magic_number;
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uint32_t magic = *(int *)file;
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int is_64 = IS_MAGIC_64(magic);
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magic_number = *(int *)ptr;
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if (magic_number == MH_MAGIC_64 || magic_number == MH_CIGAM_64)
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{
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ft_printf("I'm a 64 it binary\n");
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handle_64(ptr);
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}
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else if (magic_number == MH_MAGIC)
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{
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ft_printf("I'm a 32 it binary\n");
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/* handle_32(ptr); */
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}
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else
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{
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ft_printf("unknown architecure\n");
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}
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ft_printf("{gre}I'm %s a 64 bit binary{eoc}\n", is_64 ? "" : "not");
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dump_load_commands(file);
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}
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int main(int ac, char **av)
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{
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int fd;
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char *ptr;
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char *file;
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struct stat buf;
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if (ac != 2)
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@ -86,11 +93,11 @@ int main(int ac, char **av)
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return (1);
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if ((fstat(fd, &buf)) < 0)
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return (1);
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if ((ptr = mmap(NULL, buf.st_size, PROT_READ, MAP_PRIVATE, fd, 0))
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if ((file = mmap(NULL, buf.st_size, PROT_READ, MAP_PRIVATE, fd, 0))
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== MAP_FAILED)
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return (1);
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nm(ptr);
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if (munmap(ptr, buf.st_size))
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nm(file);
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if (munmap(file, buf.st_size))
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return (1);
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return (0);
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}
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