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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"
static int pe_free_image_meta_impl(struct pe_image_meta * meta, int status)
{
unsigned i;
if (meta) {
for (i=0; i<meta->summary.nimplibs; i++)
free(meta->idata[i].items);
free(meta->idata);
free(meta->sectbl);
free(meta);
}
return status;
}
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.num_of_sections; i++)
if (!(strcmp(name,m->sectbl[i].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.num_of_sections; i++) {
low = m->sectbl[i].virtual_addr;
high = low + m->sectbl[i].virtual_size;
if ((block->rva >= low) && (block->rva + block->size <= high))
return i;
}
return -1;
}
int pe_get_image_meta(const struct pe_raw_image * image, struct pe_image_meta ** meta)
{
int i,j,s,status;
struct pe_image_meta * m;
char * base = image->addr;
if (!(m = calloc(1,sizeof(*m))))
return -1;
m->ados = (struct pe_image_dos_hdr *)base;
if ((status = (pe_read_dos_header(m->ados,&m->dos))))
return pe_free_image_meta_impl(m,status);
m->acoff = (struct pe_coff_file_hdr *)(base + m->dos.dos_lfanew);
if ((status = (pe_read_coff_header(m->acoff,&m->coff))))
return pe_free_image_meta_impl(m,status);
m->aopt = (union pe_opt_hdr *)((char *)m->acoff + sizeof(m->coff));
if ((status = (pe_read_optional_header(m->aopt,&m->opt))))
return pe_free_image_meta_impl(m,status);
m->asectbl = (struct pe_sec_hdr *)((char *)m->aopt + m->coff.size_of_opt_hdr);
if (!(m->sectbl = calloc(m->coff.num_of_sections,sizeof(*(m->sectbl)))))
return pe_free_image_meta_impl(m,status);
for (i=0; i<m->coff.num_of_sections; i++)
pe_read_section_header(&m->asectbl[i],&m->sectbl[i]);
/* .edata */
i = pe_get_named_section_index(m,".edata");
s = pe_get_block_section_index(m,&m->opt.dirs.export_tbl);
if ((i >= 0) && (i != s))
return pe_free_image_meta_impl(m,PERK_MALFORMED_IMAGE);
if (s >= 0) {
m->hedata = &m->sectbl[s];
m->aedata = (struct pe_export_hdr *)(base + m->sectbl[s].ptr_to_raw_data
+ m->opt.dirs.export_tbl.rva - m->sectbl[s].virtual_addr);
} else if (i >= 0) {
m->hedata = &m->sectbl[i];
m->aedata = (struct pe_export_hdr *)(base + m->sectbl[i].ptr_to_raw_data);
}
if (m->aedata)
pe_read_export_header(m->aedata,&m->edata);
/* .idata */
struct pe_import_hdr * pidata;
union pe_import_lookup_item * pitem;
i = pe_get_named_section_index(m,".idata");
s = pe_get_block_section_index(m,&m->opt.dirs.import_tbl);
if ((i >= 0) && (i != s))
return pe_free_image_meta_impl(m,PERK_MALFORMED_IMAGE);
if (s >= 0) {
m->hidata = &m->sectbl[s];
m->aidata = (struct pe_import_hdr *)(base + m->sectbl[s].ptr_to_raw_data
+ m->opt.dirs.import_tbl.rva - m->sectbl[s].virtual_addr);
} else if (i >= 0) {
m->hidata = &m->sectbl[i];
m->aidata = (struct pe_import_hdr *)(base + m->sectbl[i].ptr_to_raw_data);
}
if (m->aidata) {
/* num of implibs */
for (pidata=m->aidata; pidata->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,status);
for (i=0; i<m->summary.nimplibs; i++) {
pe_read_import_header(&m->aidata[i],&m->idata[i]);
m->idata[i].name = base + m->hidata->ptr_to_raw_data
+ m->idata[i].name_rva - m->hidata->virtual_addr;
if (m->idata[i].import_lookup_tbl_rva)
m->idata[i].aitems = (union pe_import_lookup_item *)(base + m->hidata->ptr_to_raw_data
+ m->idata[i].import_lookup_tbl_rva - m->hidata->virtual_addr);
/* items */
uint32_t * hint;
m->idata[i].count = 0;
if (m->idata[i].import_lookup_tbl_rva) {
pitem = m->idata[i].aitems;
hint = (uint32_t *)pitem->hint_name_tbl_rva;
for (; *hint; hint=(uint32_t *)((++pitem)->hint_name_tbl_rva))
m->idata[i].count++;
if (!(m->idata[i].items = calloc(m->idata[i].count,sizeof(*(m->idata[i].items)))))
return pe_free_image_meta_impl(m,status);
}
for (j=0; j<m->idata[i].count; j++) {
if ((status = pe_read_import_lookup_item(
&(m->idata[i].aitems[j]),
&(m->idata[i].items[j]),
m->opt.std.magic)))
return pe_free_image_meta_impl(m,status);
switch (m->opt.std.magic) {
case PE_MAGIC_PE32:
m->idata[i].items[j].flags = m->idata[i].items[j].u.import_lookup_entry_32;
break;
case PE_MAGIC_PE32_PLUS:
m->idata[i].items[j].flags = (m->idata[i].items[j].u.import_lookup_entry_64 >> 32);
break;
}
if (!m->idata[i].items[j].flags) {
struct pe_hint_name_entry * pentry =
(struct pe_hint_name_entry *)(base + m->hidata->ptr_to_raw_data
+ m->idata[i].items[j].u.hint_name_tbl_rva - m->hidata->virtual_addr);
m->idata[i].items[j].name = (char *)pentry->name;
}
}
}
}
/* image */
m->image.addr = image->addr;
m->image.size = image->size;
/* all done */
*meta = m;
return 0;
}
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