Blame src/logic/pe_get_image_meta.c

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/***************************************************************/
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/*  perk: PE Resource Kit                                      */
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/*  Copyright (C) 2015--2016  Z. Gilboa                        */
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/*  Released under GPLv2 and GPLv3; see COPYING.PERK.          */
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/***************************************************************/
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#include <stdint.h>
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#include <stdlib.h>
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#include <stdio.h>
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#include <string.h>
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#include <perk/perk.h>
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#include "perk_reader_impl.h"
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#include "perk_errinfo_impl.h"
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static int pe_free_image_meta_impl(struct pe_image_meta * meta, int ret)
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{
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	int i;
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	if (meta) {
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		for (i=0; i<meta->summary.nimplibs; i++)
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			free(meta->idata[i].items);
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		free(meta->idata);
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		free(meta->sectbl);
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		free(meta);
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	}
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	return ret;
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}
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void pe_free_image_meta(struct pe_image_meta * meta)
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{
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	pe_free_image_meta_impl(meta,0);
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}
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int pe_get_named_section_index(const struct pe_image_meta * m, const char * name)
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{
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	int i; for (i=0; i<m->coff.num_of_sections; i++)
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		if (!(strcmp(name,m->sectbl[i].name)))
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			return i;
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	return -1;
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}
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int pe_get_block_section_index(const struct pe_image_meta * m, const struct pe_block * block)
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{
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	int i;
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	uint32_t low,high;
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	for (i=0; i<m->coff.num_of_sections; i++) {
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		low  = m->sectbl[i].virtual_addr;
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		high = low + m->sectbl[i].virtual_size;
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		if ((block->rva >= low) && (block->rva + block->size <= high))
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			return i;
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	}
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	return -1;
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}
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int pe_get_roffset_from_rva(const struct pe_image_meta * m, uint32_t rva, uint32_t * roffset)
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{
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	int i;
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	uint32_t low,high;
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	for (i=0; i<m->coff.num_of_sections; i++) {
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		low  = m->sectbl[i].virtual_addr;
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		high = low + m->sectbl[i].virtual_size;
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		if ((rva >= low) && (rva < high)) {
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			*roffset = (rva - low) + m->sectbl[i].ptr_to_raw_data;
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			return 0;
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		}
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	}
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	return -1;
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}
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int pe_get_rva_from_roffset(const struct pe_image_meta * m, uint32_t roffset, uint32_t * rva)
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{
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	int i;
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	uint32_t low,high,ref;
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	for (i=0, ref=~0; i<m->coff.num_of_sections; i++) {
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		low  = m->sectbl[i].ptr_to_raw_data;
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		high = low + m->sectbl[i].virtual_size;
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		if ((roffset >= low) && (roffset < high)) {
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			*rva = (roffset - low) + m->sectbl[i].virtual_addr;
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			return 0;
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		} else if (ref > low) {
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			ref = low;
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		}
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	}
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	if (roffset < ref) {
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		*rva = roffset;
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		return 0;
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	}
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	return -1;
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}
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int pe_get_expsym_by_name(
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	const struct pe_image_meta *	m,
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	const char *			name,
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	struct pe_expsym *		expsym)
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{
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	uint32_t 	offset;
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	uint32_t *	symrva;
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	const char *	sym;
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	unsigned	i;
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	offset	= m->hedata->virtual_addr - m->hedata->ptr_to_raw_data;
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	symrva	= (uint32_t *)((uintptr_t)m->image.addr + (m->edata.name_ptr_rva - offset));
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	for (i=0; i<m->edata.num_of_name_ptrs; i++) {
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		sym = (const char *)m->image.addr + symrva[i] - offset;
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		if (!(strcmp(sym,name))) {
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			if (expsym) {
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				expsym->name    = sym;
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				expsym->eaddr   = 0;
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				expsym->maddr   = 0;
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				expsym->roffset = 0;
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			}
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			return 0;
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		}
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	}
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	return -1;
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}
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int pe_get_expsym_by_index(
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	const struct pe_image_meta *	m,
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	unsigned			index,
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	struct pe_expsym *		expsym)
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{
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	uint32_t 	offset;
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	uint32_t *	symrva;
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	uintptr_t	symaddr;
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	if (index >= m->edata.num_of_name_ptrs)
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		return -1;
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	if (expsym) {
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		offset  = m->hedata->virtual_addr - m->hedata->ptr_to_raw_data;
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		symrva  = (uint32_t *)((uintptr_t)m->image.addr + (m->edata.name_ptr_rva - offset));
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		symaddr = (uintptr_t)m->image.addr + symrva[index] - offset;
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		expsym->name    = (const char *)symaddr;
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		expsym->eaddr   = 0;
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		expsym->maddr   = 0;
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		expsym->roffset = 0;
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	}
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	return 0;
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}
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int pe_get_image_meta(
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	const struct pe_driver_ctx *	dctx,
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	const struct pe_raw_image *	image,
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	struct pe_image_meta ** meta)
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{
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	int			ret;
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	int 			i,s;
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	long			l;
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	unsigned		j;
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	const unsigned char *	mark;
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	struct pe_image_meta *	m;
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	char *			base;
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	base = image->addr;
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	if (!(m = calloc(1,sizeof(*m))))
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		return PERK_SYSTEM_ERROR(dctx);
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	m->ados = (struct pe_raw_image_dos_hdr *)base;
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	if ((ret = (pe_read_dos_header(m->ados,&m->dos))))
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		return pe_free_image_meta_impl(
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			m,PERK_CUSTOM_ERROR(dctx,ret));
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	m->acoff = (struct pe_raw_coff_file_hdr *)(base + m->dos.dos_lfanew);
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	if ((ret = (pe_read_coff_header(m->acoff,&m->coff))))
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		return pe_free_image_meta_impl(
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			m,PERK_CUSTOM_ERROR(dctx,ret));
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	mark  = (const unsigned char *)image->addr + m->coff.ptr_to_sym_tbl;
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	mark += m->coff.num_of_syms * sizeof(struct pe_raw_coff_symbol);
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	m->coff.ptr_to_string_tbl  = m->coff.ptr_to_sym_tbl;
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	m->coff.ptr_to_string_tbl += m->coff.num_of_syms * sizeof(struct pe_raw_coff_symbol);
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	m->coff.size_of_string_tbl = pe_read_long(mark);
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	mark    = &m->acoff->signature[0];
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	m->aopt = (union pe_raw_opt_hdr *)(mark + sizeof(*m->acoff));
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	if ((ret = (pe_read_optional_header(m->aopt,&m->opt))))
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		return pe_free_image_meta_impl(
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			m,PERK_CUSTOM_ERROR(dctx,ret));
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	mark       = &m->aopt->opt_hdr_32.magic[0];
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	m->asectbl = (struct pe_raw_sec_hdr *)(mark + m->coff.size_of_opt_hdr);
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	if (!(m->sectbl = calloc(m->coff.num_of_sections,sizeof(*(m->sectbl)))))
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		return pe_free_image_meta_impl(
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			m,PERK_SYSTEM_ERROR(dctx));
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	for (i=0; i<m->coff.num_of_sections; i++) {
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		pe_read_section_header(&m->asectbl[i],&m->sectbl[i]);
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		if (m->sectbl[i].name[0] == '/')
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			if ((l = strtol(&m->sectbl[i].name[1],0,10)) > 0)
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				if (l < m->coff.size_of_string_tbl)
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					m->sectbl[i].long_name = base + m->coff.ptr_to_string_tbl + l;
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	}
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	/* .edata */
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	i = pe_get_named_section_index(m,".edata");
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	s = pe_get_block_section_index(m,&m->opt.dirs.export_tbl);
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	if ((i >= 0) && (i != s))
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		return pe_free_image_meta_impl(
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			m,PERK_CUSTOM_ERROR(dctx,PERK_ERR_IMAGE_MALFORMED));
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	if (s >= 0) {
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		m->hedata = &m->sectbl[s];
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		m->aedata = (struct pe_raw_export_hdr *)(base + m->sectbl[s].ptr_to_raw_data
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				+ m->opt.dirs.export_tbl.rva - m->sectbl[s].virtual_addr);
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	} else if (i >= 0) {
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		m->hedata = &m->sectbl[i];
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		m->aedata = (struct pe_raw_export_hdr *)(base + m->sectbl[i].ptr_to_raw_data);
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	}
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	if (m->aedata) {
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		pe_read_export_header(m->aedata,&m->edata);
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		m->summary.nexpsyms = m->edata.num_of_name_ptrs;
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	}
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	/* .idata */
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	struct pe_raw_import_hdr * 	pidata;
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	union  pe_raw_import_lookup *	pitem;
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	i = pe_get_named_section_index(m,".idata");
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	s = pe_get_block_section_index(m,&m->opt.dirs.import_tbl);
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	if ((i >= 0) && (i != s))
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		return pe_free_image_meta_impl(
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			m,PERK_CUSTOM_ERROR(dctx,PERK_ERR_IMAGE_MALFORMED));
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	if (s >= 0) {
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		m->hidata = &m->sectbl[s];
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		m->aidata = (struct pe_raw_import_hdr *)(base + m->sectbl[s].ptr_to_raw_data
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				+ m->opt.dirs.import_tbl.rva - m->sectbl[s].virtual_addr);
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	} else if (i >= 0) {
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		m->hidata = &m->sectbl[i];
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		m->aidata = (struct pe_raw_import_hdr *)(base + m->sectbl[i].ptr_to_raw_data);
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	}
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	if (m->aidata) {
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		/* num of implibs */
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		for (pidata=m->aidata; pidata->name_rva[0]; pidata++)
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			m->summary.nimplibs++;
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		/* import headers */
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		if (!(m->idata = calloc(m->summary.nimplibs,sizeof(*m->idata))))
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			return pe_free_image_meta_impl(
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				m,PERK_SYSTEM_ERROR(dctx));
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		for (i=0; i<m->summary.nimplibs; i++) {
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			pe_read_import_header(&m->aidata[i],&m->idata[i]);
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			m->idata[i].name = base + m->hidata->ptr_to_raw_data
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						+ m->idata[i].name_rva - m->hidata->virtual_addr;
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			if (m->idata[i].import_lookup_tbl_rva)
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				m->idata[i].aitems = (union pe_raw_import_lookup *)(base + m->hidata->ptr_to_raw_data
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							+ m->idata[i].import_lookup_tbl_rva - m->hidata->virtual_addr);
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			/* items */
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			uint32_t * hint;
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			m->idata[i].count = 0;
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			if (m->idata[i].import_lookup_tbl_rva) {
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				pitem = m->idata[i].aitems;
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				hint  = (uint32_t *)pitem->hint_name_tbl_rva;
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				for (; *hint; hint=(uint32_t *)((++pitem)->hint_name_tbl_rva))
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					m->idata[i].count++;
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				if (!(m->idata[i].items = calloc(m->idata[i].count,sizeof(*(m->idata[i].items)))))
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					return pe_free_image_meta_impl(
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						m,PERK_SYSTEM_ERROR(dctx));
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			}
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			for (j=0; j<m->idata[i].count; j++) {
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				if ((ret = pe_read_import_lookup(
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						&(m->idata[i].aitems[j]),
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						&(m->idata[i].items[j]),
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						m->opt.std.magic)))
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					return pe_free_image_meta_impl(
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						m,PERK_CUSTOM_ERROR(dctx,ret));
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				switch (m->opt.std.magic) {
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					case PE_MAGIC_PE32:
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						m->idata[i].items[j].flags = m->idata[i].items[j].u.import_lookup_entry_32;
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						break;
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					case PE_MAGIC_PE32_PLUS:
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						m->idata[i].items[j].flags = (m->idata[i].items[j].u.import_lookup_entry_64 >> 32);
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						break;
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				}
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				if (!m->idata[i].items[j].flags) {
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					struct pe_raw_hint_name_entry * pentry =
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						(struct pe_raw_hint_name_entry *)(base + m->hidata->ptr_to_raw_data
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							+ m->idata[i].items[j].u.hint_name_tbl_rva - m->hidata->virtual_addr);
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					m->idata[i].items[j].name = (char *)pentry->name;
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				}
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			}
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		}
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	}
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	/* image */
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	m->image.addr = image->addr;
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	m->image.size = image->size;
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	/* all done */
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	*meta = m;
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	return 0;
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}