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/***************************************************************/
/* perk: PE Resource Kit */
/* Copyright (C) 2015--2016 Z. Gilboa */
/* Released under GPLv2 and GPLv3; see COPYING.PERK. */
/***************************************************************/
#include <string.h>
#include <perk/perk.h>
#include "perk_endian_impl.h"
#include "perk_reader_impl.h"
static int pe_read_optional_header_little_endian(const union pe_opt_hdr * p, struct pe_meta_opt_hdr * m)
{
m->std.magic = pe_read_short(p->opt_hdr_32.magic);
memset(&m->dirs,0,sizeof(m->dirs));
memcpy(&m->std,p,sizeof(struct pe_meta_opt_hdr_std));
switch (m->std.magic) {
case PE_MAGIC_PE32:
memcpy(&m->vers,&p->opt_hdr_32.major_os_ver,sizeof(struct pe_meta_opt_hdr_vers));
memcpy(&m->align,&p->opt_hdr_32.section_align,sizeof(struct pe_meta_opt_hdr_align));
memcpy(&m->img,&p->opt_hdr_32.size_of_image,sizeof(struct pe_meta_opt_hdr_img));
memcpy(&m->ldr,&p->opt_hdr_32.loader_flags,sizeof(struct pe_meta_opt_hdr_ldr));
if (m->ldr.rva_and_sizes > 0x10)
return PERK_ERR_BAD_IMAGE_TYPE;
else
memcpy(&m->dirs,&p->opt_hdr_32.export_tbl,sizeof(struct pe_meta_opt_hdr_dirs));
break;
case PE_MAGIC_PE32_PLUS:
memcpy(&m->vers,&p->opt_hdr_64.major_os_ver,sizeof(struct pe_meta_opt_hdr_vers));
memcpy(&m->align,&p->opt_hdr_64.section_align,sizeof(struct pe_meta_opt_hdr_align));
memcpy(&m->img,&p->opt_hdr_64.size_of_image,sizeof(struct pe_meta_opt_hdr_img));
memcpy(&m->ldr,&p->opt_hdr_64.loader_flags,sizeof(struct pe_meta_opt_hdr_ldr));
if (m->ldr.rva_and_sizes > 0x10)
return PERK_ERR_BAD_IMAGE_TYPE;
else
memcpy(&m->dirs,&p->opt_hdr_64.export_tbl,sizeof(struct pe_meta_opt_hdr_dirs));
break;
default:
return PERK_ERR_BAD_IMAGE_TYPE;
}
return 0;
}
static int pe_read_optional_header_big_endian(const union pe_opt_hdr * p, struct pe_meta_opt_hdr * m)
{
unsigned int i;
struct pe_block * pdir;
const unsigned char * mark;
struct pe_opt_hdr_std * astd;
struct pe_opt_hdr_vers * avers;
struct pe_opt_hdr_align * aalign;
struct pe_opt_hdr_img * aimg;
struct pe_opt_hdr_ldr * aldr;
m->std.magic = pe_read_short(p->opt_hdr_32.magic);
astd = (struct pe_opt_hdr_std *)p;
switch (m->std.magic) {
case PE_MAGIC_PE32:
avers = (struct pe_opt_hdr_vers *)&p->opt_hdr_32.major_os_ver;
aalign = (struct pe_opt_hdr_align *)&p->opt_hdr_32.section_align;
aimg = (struct pe_opt_hdr_img *)&p->opt_hdr_32.size_of_image;
aldr = (struct pe_opt_hdr_ldr *)&p->opt_hdr_32.loader_flags;
break;
case PE_MAGIC_PE32_PLUS:
avers = (struct pe_opt_hdr_vers *)&p->opt_hdr_64.major_os_ver;
aalign = (struct pe_opt_hdr_align *)&p->opt_hdr_64.section_align;
aimg = (struct pe_opt_hdr_img *)&p->opt_hdr_64.size_of_image;
aldr = (struct pe_opt_hdr_ldr *)&p->opt_hdr_64.loader_flags;
break;
default:
return PERK_ERR_BAD_IMAGE_TYPE;
}
/* std */
m->std.major_linker_ver = astd->major_linker_ver[0];
m->std.minor_linker_ver = astd->minor_linker_ver[0];
m->std.size_of_code = pe_read_long(astd->size_of_code);
m->std.size_of_initialized_data = pe_read_long(astd->size_of_initialized_data);
m->std.size_of_uninitialized_data = pe_read_long(astd->size_of_uninitialized_data);
m->std.entry_point = pe_read_long(astd->entry_point);
m->std.base_of_code = pe_read_long(astd->base_of_code);
/* vers */
m->vers.major_os_ver = pe_read_short(avers->major_os_ver);
m->vers.minor_os_ver = pe_read_short(avers->minor_os_ver);
m->vers.major_image_ver = pe_read_short(avers->major_image_ver);
m->vers.minor_image_ver = pe_read_short(avers->minor_image_ver);
m->vers.major_subsys_ver = pe_read_short(avers->major_subsys_ver);
m->vers.minor_subsys_ver = pe_read_short(avers->minor_subsys_ver);
m->vers.win32_ver = pe_read_long(avers->win32_ver);
/* align */
m->align.section_align = pe_read_long(aalign->section_align);
m->align.file_align = pe_read_long(aalign->file_align);
/* img */
m->img.size_of_image = pe_read_long(aimg->size_of_image);
m->img.size_of_headers = pe_read_long(aimg->size_of_headers);
m->img.checksum = pe_read_long(aimg->checksum);
m->img.subsystem = pe_read_short(aimg->subsystem);
m->img.dll_characteristics = pe_read_short(aimg->dll_characteristics);
/* ldr */
m->ldr.loader_flags = pe_read_long(aldr->loader_flags);
m->ldr.rva_and_sizes = pe_read_long(aldr->rva_and_sizes);
/* dirs */
if (m->ldr.rva_and_sizes > 0x10)
return PERK_ERR_BAD_IMAGE_TYPE;
if (m->ldr.rva_and_sizes < 0x10)
memset(&m->dirs,0,sizeof(m->dirs));
mark = p->opt_hdr_64.export_tbl;
pdir = &m->dirs.export_tbl;
for (i=0; i<m->ldr.rva_and_sizes; i++) {
pdir[i].rva = pe_read_long(&mark[i*8]);
pdir[i].size = pe_read_long(&mark[i*8+4]);
}
return 0;
}
int pe_read_optional_header(const union pe_opt_hdr * p, struct pe_meta_opt_hdr * m)
{
int ret;
if (PERK_LITTLE_ENDIAN) {
if ((ret = pe_read_optional_header_little_endian(p,m)))
return ret;
} else {
if ((ret = pe_read_optional_header_big_endian(p,m)))
return ret;
}
switch (m->std.magic) {
case PE_MAGIC_PE32:
m->mem.base_of_data = pe_read_long(p->opt_hdr_32.base_of_data);
m->mem.image_base = pe_read_long(p->opt_hdr_32.image_base);
m->mem.size_of_stack_reserve = pe_read_long(p->opt_hdr_32.size_of_stack_reserve);
m->mem.size_of_stack_commit = pe_read_long(p->opt_hdr_32.size_of_stack_commit);
m->mem.size_of_heap_reserve = pe_read_long(p->opt_hdr_32.size_of_heap_reserve);
m->mem.size_of_heap_commit = pe_read_long(p->opt_hdr_32.size_of_heap_commit);
break;
case PE_MAGIC_PE32_PLUS:
m->mem.base_of_data = (uint64_t)-1;
m->mem.image_base = pe_read_quad(p->opt_hdr_64.image_base);
m->mem.size_of_stack_reserve = pe_read_quad(p->opt_hdr_64.size_of_stack_reserve);
m->mem.size_of_stack_commit = pe_read_quad(p->opt_hdr_64.size_of_stack_commit);
m->mem.size_of_heap_reserve = pe_read_quad(p->opt_hdr_64.size_of_heap_reserve);
m->mem.size_of_heap_commit = pe_read_quad(p->opt_hdr_64.size_of_heap_commit);
break;
}
return 0;
}
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