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/* Chrysalide - Outil d'analyse de fichiers binaires
* program.c - gestion des en-têtes de programme d'un ELF
*
* Copyright (C) 2010-2013 Cyrille Bagard
*
* This file is part of Chrysalide.
*
* OpenIDA is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 3 of the License, or
* (at your option) any later version.
*
* OpenIDA is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with Foobar. If not, see <http://www.gnu.org/licenses/>.
*/
#include "program.h"
#include "elf-int.h"
/******************************************************************************
* *
* Paramètres : p_type = type associé à un en-tête de programme. *
* *
* Description : Fournit la description humaine d'un type de segment ELF. *
* *
* Retour : Désignation prête à emploi. *
* *
* Remarques : - *
* *
******************************************************************************/
const char *get_elf_program_type_desc(uint32_t p_type)
{
const char *result; /* Description à renvoyer */
#define MAKE_STRING_FROM_PT(pt) case pt: result = #pt; break;
switch(p_type)
{
MAKE_STRING_FROM_PT(PT_NULL);
MAKE_STRING_FROM_PT(PT_LOAD);
MAKE_STRING_FROM_PT(PT_DYNAMIC);
MAKE_STRING_FROM_PT(PT_INTERP);
MAKE_STRING_FROM_PT(PT_NOTE);
MAKE_STRING_FROM_PT(PT_SHLIB);
MAKE_STRING_FROM_PT(PT_PHDR);
MAKE_STRING_FROM_PT(PT_TLS);
MAKE_STRING_FROM_PT(PT_NUM);
MAKE_STRING_FROM_PT(PT_LOOS);
MAKE_STRING_FROM_PT(PT_GNU_EH_FRAME);
MAKE_STRING_FROM_PT(PT_GNU_STACK);
MAKE_STRING_FROM_PT(PT_GNU_RELRO);
MAKE_STRING_FROM_PT(PT_LOSUNW);
MAKE_STRING_FROM_PT(PT_SUNWSTACK);
MAKE_STRING_FROM_PT(PT_HIOS);
MAKE_STRING_FROM_PT(PT_LOPROC);
MAKE_STRING_FROM_PT(PT_HIPROC);
default:
result = "PT_???";
break;
}
return result;
}
/******************************************************************************
* *
* Paramètres : format = description de l'exécutable à consulter. *
* index = indice de la section recherchée. *
* program = ensemble d'informations à faire remonter. [OUT] *
* *
* Description : Recherche un programme donné au sein de binaire par indice. *
* *
* Retour : Bilan de l'opération. *
* *
* Remarques : - *
* *
******************************************************************************/
bool find_elf_program_by_index(const GElfFormat *format, uint16_t index, elf_phdr *program)
{
off_t offset; /* Emplacement à venir lire */
if (index >= ELF_HDR(format, format->header, e_phnum)) return false;
offset = ELF_HDR(format, format->header, e_phoff)
+ ELF_HDR(format, format->header, e_phentsize) * index;
return read_elf_program_header(format, &offset, program);
}
/******************************************************************************
* *
* Paramètres : format = description de l'exécutable à consulter. *
* addr = adresse virtuelle à retrouver. *
* pos = position correspondante. [OUT] *
* *
* Description : Fournit la position correspondant à une adresse virtuelle. *
* *
* Retour : Bilan de l'opération. *
* *
* Remarques : - *
* *
******************************************************************************/
bool translate_address_into_offset_using_elf_programs(const GElfFormat *format, vmpa_t addr, off_t *pos)
{
bool result; /* Bilan à retourner */
uint16_t i; /* Boucle de parcours */
elf_phdr program; /* Programme à analyser */
result = false;
for (i = 0; i < ELF_HDR(format, format->header, e_phnum) && !result; i++)
{
find_elf_program_by_index(format, i, &program);
if (ELF_PHDR(format, program, p_vaddr) <= addr
&& addr < (ELF_PHDR(format, program, p_vaddr) + ELF_PHDR(format, program, p_filesz)))
{
*pos = ELF_PHDR(format, program, p_offset) + addr - ELF_PHDR(format, program, p_vaddr);
result = true;
}
}
return result;
}
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