83 lines
2.3 KiB
C
83 lines
2.3 KiB
C
/* ************************************************************************** */
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/* */
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/* ::: :::::::: */
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/* ft_otool.c :+: :+: :+: */
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/* +:+ +:+ +:+ */
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/* By: jhalford <jack@crans.org> +#+ +:+ +#+ */
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/* +#+#+#+#+#+ +#+ */
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/* Created: 2017/02/20 14:08:14 by jhalford #+# #+# */
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/* Updated: 2017/03/27 20:41:01 by jhalford ### ########.fr */
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/* */
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/* ************************************************************************** */
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#include "ft_nm_otool.h"
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void *get_text_section(void *file)
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{
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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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struct segment_command_64 *seg;
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struct section_64 *sect;
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lc = (void*)(header + 1);
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for (i = 0; i < header->ncmds; i++)
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{
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if (lc->cmd & LC_SEGMENT_64)
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{
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seg = (struct segment_command_64*)lc;
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sect = (void*)(seg + 1);
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for (i = 0; i < seg->nsects; i++)
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{
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if (ft_strcmp(sect->sectname, "__text") == 0)
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return (sect);
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sect = sect + 1;
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}
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}
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lc = (void*)lc + lc->cmdsize;
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}
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return (NULL);
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}
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void otool(void *file)
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{
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uint32_t magic = *(int *)file;
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int is_fat = IS_FAT(magic);
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int is_64 = IS_MAGIC_64(magic);
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struct section_64 *sect;
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if (is_fat)
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ft_printf("fat binary not supported yet\n");
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else if (is_64)
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{
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sect = get_text_section(file);
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ft_printf("Contents of (__TEXT,__text) section\n");
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hexdump(file, sect->offset, sect->size);
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}
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else
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ft_printf("{red}unsupported architecture:{eoc} magic = %#x\n", magic);
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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 *file;
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struct stat buf;
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if (ac != 2)
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{
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ft_dprintf(2, "USAGE PLACEHOLDER\n");
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return (1);
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}
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if ((fd = open(av[1], O_RDONLY)) < 0)
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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 ((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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otool(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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