some refactoring
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parent
de74e299cc
commit
dd68ed6846
1 changed files with 160 additions and 85 deletions
245
src/main.c
245
src/main.c
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@ -1,3 +1,15 @@
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/* ************************************************************************** */
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/* */
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/* ::: :::::::: */
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/* main.c :+: :+: :+: */
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/* +:+ +:+ +:+ */
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/* By: gtertysh <marvin@42.fr> +#+ +:+ +#+ */
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/* +#+#+#+#+#+ +#+ */
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/* Created: 2019/07/13 14:52:27 by gtertysh #+# #+# */
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/* Updated: 2019/07/13 14:52:29 by gtertysh ### ########.fr */
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/* */
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/* ************************************************************************** */
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#include "libft.h"
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#include <fcntl.h>
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#include <sys/stat.h>
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@ -5,7 +17,6 @@
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#include <mach-o/loader.h>
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#include <mach-o/nlist.h>
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static void print_addr(void *addr)
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{
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size_t i;
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@ -25,106 +36,170 @@ static void print_addr(void *addr)
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}
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}
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int main(int argc, char **argv)
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void open_file(const char *filename, int *fd, char **file)
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{
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if (argc != 2)
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{
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ft_putstr("usage\n");
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return (1);
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}
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int fd = open(argv[1], O_RDONLY);
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if (fd == -1)
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struct stat stat_buff;
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*fd = open(filename, O_RDONLY);
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if (*fd == -1)
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{
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ft_putstr("can't open file\n");
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return (1);
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exit(1);
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}
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struct stat stat_buff;
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stat(argv[1], &stat_buff);
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stat(filename, &stat_buff);
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if (!S_ISREG(stat_buff.st_mode))
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{
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ft_putstr("not a regular file\n");
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return (1);
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close(*fd);
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exit(1);
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}
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char *file;
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file = malloc(stat_buff.st_size);
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read(fd, file, stat_buff.st_size);
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uint32_t magic = *(uint32_t *)file;
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if (magic != MH_MAGIC && magic != MH_MAGIC_64)
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*file = NULL;
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*file = malloc(stat_buff.st_size);
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if (!*file)
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{
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ft_putstr("not a mach-o file\n");
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return (1);
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ft_putstr("can't allocate memory\n");
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close(*fd);
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exit(1);
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}
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read(*fd, *file, stat_buff.st_size);
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}
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if (magic == MH_MAGIC)
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ft_putstr("32 bit mach-o file\n");
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void close_file(int fd, char *file)
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{
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close(fd);
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free(file);
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}
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void handle_64(char *file)
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{
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struct mach_header_64 *hdr;
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struct load_command *load_cmd;
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struct symtab_command *symtab_cmd;
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struct segment_command_64 *segment_cmd;
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if (magic == MH_MAGIC_64)
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hdr = (struct mach_header_64 *)file;
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ft_putstr("64 bit mach-o file\n");
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ft_putstr("# of cmds: ");
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ft_putnbr(hdr->ncmds);
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ft_putstr("\n");
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ft_putstr("total cmds memory: ");
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ft_putnbr(hdr->sizeofcmds);
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ft_putstr("\n");
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uint32_t load_cmd_offset = sizeof(struct mach_header_64);
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uint32_t i = 0;
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while (i < hdr->ncmds)
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{
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struct mach_header_64 *hdr = (struct mach_header_64 *)file;
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// ft_putstr("64 bit mach-o file\n");
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// ft_putstr("# of cmds: ");
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// ft_putnbr(hdr->ncmds);
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// ft_putstr("\n");
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// ft_putstr("total cmds memory: ");
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// ft_putnbr(hdr->sizeofcmds);
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// ft_putstr("\n");
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struct load_command *load_cmd;
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struct symtab_command *symtab_cmd;
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uint32_t load_cmd_offset = sizeof(struct mach_header_64);
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uint32_t i = 0;
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while (i < hdr->ncmds)
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load_cmd = (struct load_command *)(file + load_cmd_offset);
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if (load_cmd->cmd == LC_SEGMENT_64)
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{
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load_cmd = (struct load_command *)(file + load_cmd_offset);
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if (load_cmd->cmd == LC_SYMTAB)
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{
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symtab_cmd = (struct symtab_command *)load_cmd;
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// ft_putstr("found symbol table load command\n");
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// ft_putstr("# of symbols: ");
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// ft_putnbr(symtab_cmd->nsyms);
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// ft_putstr("\n");
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uint32_t j = 0;
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struct nlist_64 *symbol_table = (struct nlist_64 *)
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(file + symtab_cmd->symoff);
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struct nlist_64 symbol;
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char *str_table = file + symtab_cmd->stroff;
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while(j < symtab_cmd->nsyms)
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{
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symbol = symbol_table[j];
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int type = symbol.n_type & N_TYPE;
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int external = symbol.n_type & N_EXT;
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int debug = (symbol.n_type & N_STAB) != 0;
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int offset = external ? 0 : 32;
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char *name = str_table + symbol.n_un.n_strx;
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if (debug)
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{
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j++;
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continue;
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}
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if (symbol.n_value)
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print_addr((void *)symbol.n_value);
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else
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ft_putstr(" ");
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ft_putchar(' ');
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if (type == N_UNDF)
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ft_putchar('U' + offset);
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if (type == N_ABS)
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ft_putchar('A' + offset);
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if (type == N_SECT)
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// lookup in which section symbol is located
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ft_putchar('T' + offset);
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ft_putchar(' ');
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ft_putstr(name);
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ft_putstr("\n");
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j++;
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}
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}
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segment_cmd = (struct segment_command_64 *)load_cmd;
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ft_putnbr(i);
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ft_putchar(' ');
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ft_putnbr(segment_cmd->nsects);
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ft_putchar(' ');
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ft_putstr(segment_cmd->segname);
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ft_putchar('\n');
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load_cmd_offset += load_cmd->cmdsize;
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i++;
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continue;
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}
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if (load_cmd->cmd == LC_SYMTAB)
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{
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symtab_cmd = (struct symtab_command *)load_cmd;
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ft_putstr("found symbol table load command\n");
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ft_putstr("# of symbols: ");
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ft_putnbr(symtab_cmd->nsyms);
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ft_putstr("\n");
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uint32_t j = 0;
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struct nlist_64 *symbol_table = (struct nlist_64 *)
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(file + symtab_cmd->symoff);
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struct nlist_64 symbol;
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char *str_table = file + symtab_cmd->stroff;
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while(j < symtab_cmd->nsyms)
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{
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symbol = symbol_table[j];
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int type = symbol.n_type & N_TYPE;
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int external = symbol.n_type & N_EXT;
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int debug = (symbol.n_type & N_STAB) != 0;
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int offset = external ? 0 : 32;
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char *name = str_table + symbol.n_un.n_strx;
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if (debug)
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{
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j++;
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continue;
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}
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// some shit herustic should be used
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// to determine to print address or not
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if (symbol.n_value)
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print_addr((void *)symbol.n_value);
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else
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ft_putstr(" ");
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ft_putchar(' ');
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if (type == N_UNDF)
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ft_putchar('U' + offset);
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if (type == N_ABS)
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ft_putchar('A' + offset);
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if (type == N_SECT)
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{
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// lookup in which section symbol is located
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ft_putchar('T' + offset);
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ft_putchar(' ');
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ft_putnbr(symbol.n_sect);
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}
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ft_putchar(' ');
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ft_putstr(name);
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ft_putstr("\n");
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j++;
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}
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}
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load_cmd_offset += load_cmd->cmdsize;
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i++;
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}
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}
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void handle_32(char *file)
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{
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(void)file;
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ft_putstr("TODO\n");
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}
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void hanldle_file(const char *filename)
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{
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char *file;
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int fd;
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open_file(filename, &fd, &file);
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uint32_t magic;
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magic = *(uint32_t *)file;
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if (magic == MH_MAGIC_64)
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handle_64(file);
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else if (magic == MH_MAGIC)
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handle_64(file);
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else if (magic == MH_CIGAM || magic == MH_CIGAM_64)
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ft_putstr("do not support big endian binaries.");
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else
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ft_putstr("invalid magic number.");
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close_file(fd, file);
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}
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int main(int argc, char **argv)
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{
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int i;
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if (argc == 1)
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hanldle_file("a.out");
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else
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{
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i = 1;
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while (i < argc)
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hanldle_file(argv[i++]);
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}
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return (0);
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}
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