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Diffstat (limited to 'src/format/elf/section.c')
-rw-r--r-- | src/format/elf/section.c | 156 |
1 files changed, 156 insertions, 0 deletions
diff --git a/src/format/elf/section.c b/src/format/elf/section.c new file mode 100644 index 0000000..a055f47 --- /dev/null +++ b/src/format/elf/section.c @@ -0,0 +1,156 @@ + +/* OpenIDA - Outil d'analyse de fichiers binaires + * section.h - prototypes pour la gestion des sections d'un ELF + * + * Copyright (C) 2008 Cyrille Bagard + * + * This file is part of OpenIDA. + * + * 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 "section.h" + + +#include <malloc.h> +#include <string.h> + + +#include "elf-int.h" + + + +/* Teste si une section correspond à celle recherchée. */ +bool find_target_elf_section(const elf_format *, const char *, Elf32_Off, Elf32_Shdr *); + + + + + +/****************************************************************************** +* * +* Paramètres : format = description de l'exécutable à compléter. * +* * +* Description : Charge en mémoire la liste humaine des sections. * +* * +* Retour : Bilan de l'opération. * +* * +* Remarques : - * +* * +******************************************************************************/ + +bool read_elf_section_names(elf_format *format) +{ + off_t offset; /* Position des données */ + Elf32_Shdr section; /* Section visée */ + + offset = format->header.e_shoff + format->header.e_shentsize * format->header.e_shstrndx; + if ((offset + sizeof(Elf32_Shdr)) >= EXE_FORMAT(format)->length) return false; + + memcpy(§ion, &EXE_FORMAT(format)->content[offset], sizeof(Elf32_Shdr)); + + if ((section.sh_offset + section.sh_size) >= EXE_FORMAT(format)->length) return false; + + format->sec_names = (char *)calloc(section.sh_size + 1, sizeof(char)); + format->sec_size = section.sh_size; + + memcpy(format->sec_names, &EXE_FORMAT(format)->content[section.sh_offset], section.sh_size); + + return true; + +} + + +/****************************************************************************** +* * +* Paramètres : format = description de l'exécutable à consulter. * +* target = nom de la section recherchée. * +* offset = position de la section à tester. * +* data = description de la section trouvée. [OUT] * +* * +* Description : Teste si une section correspond à celle recherchée. * +* * +* Retour : Bilan de l'opération. * +* * +* Remarques : - * +* * +******************************************************************************/ + +bool find_target_elf_section(const elf_format *format, const char *target, Elf32_Off offset, Elf32_Shdr *data) +{ + bool result; /* Conclusion à retourner */ + Elf32_Shdr section; /* Section à analyser */ + + result = false; + + if ((offset + sizeof(Elf32_Shdr)) >= EXE_FORMAT(format)->length) return false; + + memcpy(§ion, &EXE_FORMAT(format)->content[offset], sizeof(Elf32_Shdr)); + + result = (strcmp(target, &format->sec_names[section.sh_name]) == 0); + + if (result) *data = section; + + return result; + +} + + +/****************************************************************************** +* * +* Paramètres : format = description de l'exécutable à consulter. * +* target = nom de la section recherchée. * +* offset = position de la section trouvée. [OUT] * +* size = taille de la section trouvée. [OUT] * +* voffset = adresse virtuelle de la section trouvée. [OUT] * +* * +* Description : Recherche une section donnée au sein de binaire. * +* * +* Retour : Bilan de l'opération. * +* * +* Remarques : - * +* * +******************************************************************************/ + +bool find_elf_section(const elf_format *format, const char *target, off_t *offset, off_t *size, uint64_t *voffset) +{ + bool result; + Elf32_Half i; + Elf32_Shdr data; + + result = false; + + for (i = 0; i < format->header.e_shnum; i++) + { + if (i == format->header.e_shstrndx) continue; + + if (find_target_elf_section(format, target, + format->header.e_shoff + format->header.e_shentsize * i, &data)) + { + *offset = data.sh_offset; + *size = data.sh_size; + + if (voffset != NULL) + *voffset = data.sh_addr; + + result = true; + + } + + } + + return result; + +} |