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/***************************************************************/
/* perk: PE Resource Kit */
/* Copyright (C) 2015--2016 Z. Gilboa */
/* Released under GPLv2 and GPLv3; see COPYING.PERK. */
/***************************************************************/
#include <stdint.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <perk/perk.h>
#include "perk_reader_impl.h"
#include "perk_errinfo_impl.h"
static int pe_free_image_meta_impl(struct pe_image_meta * meta, int ret)
{
int i;
if (meta) {
for (i=0; i<meta->summary.nimplibs; i++)
free(meta->idata[i].ih_items);
free(meta->idata);
free(meta->sectbl);
free(meta);
}
return ret;
}
void pe_free_image_meta(struct pe_image_meta * meta)
{
pe_free_image_meta_impl(meta,0);
}
int pe_get_named_section_index(const struct pe_image_meta * m, const char * name)
{
int i; for (i=0; i<m->coff.cfh_num_of_sections; i++)
if (!(strcmp(name,m->sectbl[i].sh_name)))
return i;
return -1;
}
int pe_get_block_section_index(const struct pe_image_meta * m, const struct pe_block * block)
{
int i;
uint32_t low,high;
for (i=0; i<m->coff.cfh_num_of_sections; i++) {
low = m->sectbl[i].sh_virtual_addr;
high = low + m->sectbl[i].sh_virtual_size;
if ((block->dh_rva >= low) && (block->dh_rva + block->dh_size <= high))
return i;
}
return -1;
}
int pe_get_roffset_from_rva(const struct pe_image_meta * m, uint32_t rva, uint32_t * roffset)
{
int i;
uint32_t low,high;
for (i=0; i<m->coff.cfh_num_of_sections; i++) {
low = m->sectbl[i].sh_virtual_addr;
high = low + m->sectbl[i].sh_virtual_size;
if ((rva >= low) && (rva < high)) {
*roffset = (rva - low) + m->sectbl[i].sh_ptr_to_raw_data;
return 0;
}
}
return -1;
}
int pe_get_rva_from_roffset(const struct pe_image_meta * m, uint32_t roffset, uint32_t * rva)
{
int i;
uint32_t low,high,ref;
for (i=0, ref=~0; i<m->coff.cfh_num_of_sections; i++) {
low = m->sectbl[i].sh_ptr_to_raw_data;
high = low + m->sectbl[i].sh_virtual_size;
if ((roffset >= low) && (roffset < high)) {
*rva = (roffset - low) + m->sectbl[i].sh_virtual_addr;
return 0;
} else if (ref > low) {
ref = low;
}
}
if (roffset < ref) {
*rva = roffset;
return 0;
}
return -1;
}
int pe_get_expsym_by_name(
const struct pe_image_meta * m,
const char * name,
struct pe_expsym * expsym)
{
uint32_t offset;
uint32_t * symrva;
const char * sym;
unsigned i;
offset = m->hedata->sh_virtual_addr - m->hedata->sh_ptr_to_raw_data;
symrva = (uint32_t *)((uintptr_t)m->image.addr + (m->edata.eh_name_ptr_rva - offset));
for (i=0; i<m->edata.eh_num_of_name_ptrs; i++) {
sym = (const char *)m->image.addr + symrva[i] - offset;
if (!(strcmp(sym,name))) {
if (expsym) {
expsym->name = sym;
expsym->eaddr = 0;
expsym->maddr = 0;
expsym->roffset = 0;
}
return 0;
}
}
return -1;
}
int pe_get_expsym_by_index(
const struct pe_image_meta * m,
unsigned index,
struct pe_expsym * expsym)
{
uint32_t offset;
uint32_t * symrva;
uintptr_t symaddr;
if (index >= m->edata.eh_num_of_name_ptrs)
return -1;
if (expsym) {
offset = m->hedata->sh_virtual_addr - m->hedata->sh_ptr_to_raw_data;
symrva = (uint32_t *)((uintptr_t)m->image.addr + (m->edata.eh_name_ptr_rva - offset));
symaddr = (uintptr_t)m->image.addr + symrva[index] - offset;
expsym->name = (const char *)symaddr;
expsym->eaddr = 0;
expsym->maddr = 0;
expsym->roffset = 0;
}
return 0;
}
int pe_get_image_meta(
const struct pe_driver_ctx * dctx,
const struct pe_raw_image * image,
struct pe_image_meta ** meta)
{
int ret;
int i,s;
long l;
unsigned j;
const unsigned char * mark;
struct pe_image_meta * m;
char * base;
base = image->addr;
if (!(m = calloc(1,sizeof(*m))))
return PERK_SYSTEM_ERROR(dctx);
m->ados = (struct pe_raw_image_dos_hdr *)base;
if ((ret = (pe_read_dos_header(m->ados,&m->dos))))
return pe_free_image_meta_impl(
m,PERK_CUSTOM_ERROR(dctx,ret));
m->acoff = (struct pe_raw_coff_file_hdr *)(base + m->dos.dos_lfanew);
if ((ret = (pe_read_coff_header(m->acoff,&m->coff))))
return pe_free_image_meta_impl(
m,PERK_CUSTOM_ERROR(dctx,ret));
mark = (const unsigned char *)image->addr + m->coff.cfh_ptr_to_sym_tbl;
mark += m->coff.cfh_num_of_syms * sizeof(struct pe_raw_coff_symbol);
m->coff.cfh_ptr_to_str_tbl = m->coff.cfh_ptr_to_sym_tbl;
m->coff.cfh_ptr_to_str_tbl += m->coff.cfh_num_of_syms * sizeof(struct pe_raw_coff_symbol);
m->coff.cfh_size_of_str_tbl = pe_read_long(mark);
mark = &m->acoff->cfh_signature[0];
m->aopt = (union pe_raw_opt_hdr *)(mark + sizeof(*m->acoff));
if ((ret = (pe_read_optional_header(m->aopt,&m->opt))))
return pe_free_image_meta_impl(
m,PERK_CUSTOM_ERROR(dctx,ret));
mark = &m->aopt->opt_hdr_32.coh_magic[0];
m->asectbl = (struct pe_raw_sec_hdr *)(mark + m->coff.cfh_size_of_opt_hdr);
if (!(m->sectbl = calloc(m->coff.cfh_num_of_sections,sizeof(*(m->sectbl)))))
return pe_free_image_meta_impl(
m,PERK_SYSTEM_ERROR(dctx));
for (i=0; i<m->coff.cfh_num_of_sections; i++) {
pe_read_section_header(&m->asectbl[i],&m->sectbl[i]);
if (m->sectbl[i].sh_name[0] == '/')
if ((l = strtol(&m->sectbl[i].sh_name[1],0,10)) > 0)
if (l < m->coff.cfh_size_of_str_tbl)
m->sectbl[i].sh_long_name = base + m->coff.cfh_ptr_to_str_tbl + l;
}
/* .edata */
i = pe_get_named_section_index(m,".edata");
s = pe_get_block_section_index(m,&m->opt.oh_dirs.coh_export_tbl);
if ((i >= 0) && (i != s))
return pe_free_image_meta_impl(
m,PERK_CUSTOM_ERROR(dctx,PERK_ERR_IMAGE_MALFORMED));
if (s >= 0) {
m->hedata = &m->sectbl[s];
m->aedata = (struct pe_raw_export_hdr *)(base + m->sectbl[s].sh_ptr_to_raw_data
+ m->opt.oh_dirs.coh_export_tbl.dh_rva - m->sectbl[s].sh_virtual_addr);
} else if (i >= 0) {
m->hedata = &m->sectbl[i];
m->aedata = (struct pe_raw_export_hdr *)(base + m->sectbl[i].sh_ptr_to_raw_data);
}
if (m->aedata) {
pe_read_export_header(m->aedata,&m->edata);
m->summary.nexpsyms = m->edata.eh_num_of_name_ptrs;
}
/* .idata */
struct pe_raw_import_hdr * pidata;
union pe_raw_import_lookup * pitem;
i = pe_get_named_section_index(m,".idata");
s = pe_get_block_section_index(m,&m->opt.oh_dirs.coh_import_tbl);
if ((i >= 0) && (i != s))
return pe_free_image_meta_impl(
m,PERK_CUSTOM_ERROR(dctx,PERK_ERR_IMAGE_MALFORMED));
if (s >= 0) {
m->hidata = &m->sectbl[s];
m->aidata = (struct pe_raw_import_hdr *)(base + m->sectbl[s].sh_ptr_to_raw_data
+ m->opt.oh_dirs.coh_import_tbl.dh_rva - m->sectbl[s].sh_virtual_addr);
} else if (i >= 0) {
m->hidata = &m->sectbl[i];
m->aidata = (struct pe_raw_import_hdr *)(base + m->sectbl[i].sh_ptr_to_raw_data);
}
if (m->aidata) {
/* num of implibs */
for (pidata=m->aidata; pidata->ih_name_rva[0]; pidata++)
m->summary.nimplibs++;
/* import headers */
if (!(m->idata = calloc(m->summary.nimplibs,sizeof(*m->idata))))
return pe_free_image_meta_impl(
m,PERK_SYSTEM_ERROR(dctx));
for (i=0; i<m->summary.nimplibs; i++) {
pe_read_import_header(&m->aidata[i],&m->idata[i]);
m->idata[i].ih_name = base + m->hidata->sh_ptr_to_raw_data
+ m->idata[i].ih_name_rva
- m->hidata->sh_virtual_addr;
if (m->idata[i].ih_import_lookup_tbl_rva)
m->idata[i].ih_aitems = (union pe_raw_import_lookup *)(base + m->hidata->sh_ptr_to_raw_data
+ m->idata[i].ih_import_lookup_tbl_rva
- m->hidata->sh_virtual_addr);
/* items */
uint32_t * hint;
m->idata[i].ih_count = 0;
if (m->idata[i].ih_import_lookup_tbl_rva) {
pitem = m->idata[i].ih_aitems;
hint = (uint32_t *)pitem->ii_hint_name_tbl_rva;
for (; *hint; hint=(uint32_t *)((++pitem)->ii_hint_name_tbl_rva))
m->idata[i].ih_count++;
if (!(m->idata[i].ih_items = calloc(m->idata[i].ih_count,sizeof(*(m->idata[i].ih_items)))))
return pe_free_image_meta_impl(
m,PERK_SYSTEM_ERROR(dctx));
}
for (j=0; j<m->idata[i].ih_count; j++) {
if ((ret = pe_read_import_lookup(
&(m->idata[i].ih_aitems[j]),
&(m->idata[i].ih_items[j]),
m->opt.oh_std.coh_magic)))
return pe_free_image_meta_impl(
m,PERK_CUSTOM_ERROR(dctx,ret));
switch (m->opt.oh_std.coh_magic) {
case PE_MAGIC_PE32:
m->idata[i].ih_items[j].ii_flags = m->idata[i].ih_items[j].u.ii_import_lookup_entry_32;
break;
case PE_MAGIC_PE32_PLUS:
m->idata[i].ih_items[j].ii_flags = (m->idata[i].ih_items[j].u.ii_import_lookup_entry_64 >> 32);
break;
}
if (!m->idata[i].ih_items[j].ii_flags) {
struct pe_raw_hint_name_entry * pentry =
(struct pe_raw_hint_name_entry *)(base + m->hidata->sh_ptr_to_raw_data
+ m->idata[i].ih_items[j].u.ii_hint_name_tbl_rva - m->hidata->sh_virtual_addr);
m->idata[i].ih_items[j].ii_name = (char *)pentry->ii_name;
}
}
}
}
/* image */
m->image.addr = image->addr;
m->image.size = image->size;
/* all done */
*meta = m;
return 0;
}
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