summaryrefslogtreecommitdiffhomepage
path: root/src/reader/pe_read_optional_header.c
blob: 5ece6a33344702ac012726b444215b47acd0c028 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
/***************************************************************/
/*  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_structs(const union pe_raw_opt_hdr * p, struct pe_meta_opt_hdr * m)
{
	unsigned int			i;
	struct pe_block *		pdir;
	const  unsigned char *		mark;

	struct pe_raw_opt_hdr_std *	astd;
	struct pe_raw_opt_hdr_vers *	avers;
	struct pe_raw_opt_hdr_align *	aalign;
	struct pe_raw_opt_hdr_img *	aimg;
	struct pe_raw_opt_hdr_ldr *	aldr;

	m->std.magic = pe_read_short(p->opt_hdr_32.magic);

	switch (m->std.magic) {
		case PE_MAGIC_PE32:
			astd	= (struct pe_raw_opt_hdr_std *)p;
			avers	= (struct pe_raw_opt_hdr_vers *)&p->opt_hdr_32.major_os_ver;
			aalign	= (struct pe_raw_opt_hdr_align *)&p->opt_hdr_32.section_align;
			aimg	= (struct pe_raw_opt_hdr_img *)&p->opt_hdr_32.size_of_image;
			aldr	= (struct pe_raw_opt_hdr_ldr *)&p->opt_hdr_32.loader_flags;
			break;

		case PE_MAGIC_PE32_PLUS:
			astd	= (struct pe_raw_opt_hdr_std *)p;
			avers	= (struct pe_raw_opt_hdr_vers *)&p->opt_hdr_64.major_os_ver;
			aalign	= (struct pe_raw_opt_hdr_align *)&p->opt_hdr_64.section_align;
			aimg	= (struct pe_raw_opt_hdr_img *)&p->opt_hdr_64.size_of_image;
			aldr	= (struct pe_raw_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_raw_opt_hdr * p, struct pe_meta_opt_hdr * m)
{
	int ret;

	if ((ret = pe_read_optional_header_structs(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;
}