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-rw-r--r--src/format/elf/Makefile.am3
-rw-r--r--src/format/elf/e_elf.c5
-rw-r--r--src/format/elf/elf-int.h11
-rw-r--r--src/format/elf/symbol.c243
-rw-r--r--src/format/elf/symbol.h40
5 files changed, 301 insertions, 1 deletions
diff --git a/src/format/elf/Makefile.am b/src/format/elf/Makefile.am
index cb5682d..4886115 100644
--- a/src/format/elf/Makefile.am
+++ b/src/format/elf/Makefile.am
@@ -4,7 +4,8 @@ lib_LIBRARIES = libformatelf.a
libformatelf_a_SOURCES = \
e_elf.h e_elf.c \
elf-int.h \
- section.h section.c
+ section.h section.c \
+ symbol.h symbol.c
libformatelf_a_CFLAGS = $(AM_CFLAGS)
diff --git a/src/format/elf/e_elf.c b/src/format/elf/e_elf.c
index 1c08cf3..a6399ab 100644
--- a/src/format/elf/e_elf.c
+++ b/src/format/elf/e_elf.c
@@ -30,6 +30,7 @@
#include "elf-int.h"
#include "section.h"
+#include "symbol.h"
@@ -66,6 +67,10 @@ elf_format *load_elf(const uint8_t *content, off_t length)
printf("ok ? %d\n", test);
+ test = load_elf_symbols(result);
+
+ printf("ok ? %d\n", test);
+
return result;
diff --git a/src/format/elf/elf-int.h b/src/format/elf/elf-int.h
index 0fd325f..2ec33c3 100644
--- a/src/format/elf/elf-int.h
+++ b/src/format/elf/elf-int.h
@@ -34,6 +34,15 @@
+/* Symbole trouvé */
+typedef struct _elf_symbol
+{
+ const char *name; /* Désignation du symbole */
+ uint64_t address; /* Adresse du symbole */
+
+} elf_symbol;
+
+
/* Description du format ELF */
struct _elf_format
@@ -45,6 +54,8 @@ struct _elf_format
char *sec_names; /* Noms des sections */
size_t sec_size; /* Taille de ces définitions */
+ elf_symbol *symbols; /* Liste des symboles */
+ size_t sym_count; /* Taille de cette liste */
};
diff --git a/src/format/elf/symbol.c b/src/format/elf/symbol.c
new file mode 100644
index 0000000..729c154
--- /dev/null
+++ b/src/format/elf/symbol.c
@@ -0,0 +1,243 @@
+
+/* OpenIDA - Outil d'analyse de fichiers binaires
+ * symbol.c - gestion des symboles 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 "symbol.h"
+
+
+#include <malloc.h>
+#include <elf.h>
+#include <string.h>
+
+
+
+#include "elf-int.h"
+#include "section.h"
+
+
+
+
+
+/* Charge en mémoire la liste humaine des symboles (32 bits). */
+bool load_elf_symbol_table_32(elf_format *, const off_t *, const off_t *, const off_t *, const off_t *);
+
+/* Charge en mémoire la liste humaine des symboles (64 bits). */
+bool load_elf_symbol_table_64(elf_format *, const off_t *, const off_t *, const off_t *, const off_t *);
+
+
+
+
+/******************************************************************************
+* *
+* Paramètres : format = description de l'exécutable à compléter. *
+* *
+* Description : Charge en mémoire la liste humaine des symboles. *
+* *
+* Retour : Bilan de l'opération. *
+* *
+* Remarques : - *
+* *
+******************************************************************************/
+
+bool load_elf_symbols(elf_format *format)
+{
+ bool result; /* Bilan à retourner */
+
+
+ off_t sym_start; /* Début de section */
+ off_t sym_size; /* Taille de section */
+ off_t str_start; /* Début de section */
+ off_t str_size; /* Taille de section */
+
+
+ result = find_elf_section(format, ".symtab", &sym_start, &sym_size, NULL);
+
+ result &= find_elf_section(format, ".strtab", &str_start, &str_size, NULL);
+
+
+ if (result)
+ {
+
+
+
+ result = load_elf_symbol_table_32(format, &sym_start, &sym_size, &str_start, &str_start);
+
+
+
+ }
+
+ return result;
+
+}
+
+
+
+
+
+
+/******************************************************************************
+* *
+* Paramètres : format = description de l'exécutable à compléter. *
+* sym_start = début de la zone à traiter. *
+* sym_size = taille de la zone à traiter. *
+* str_start = début de la zone de chaîne de caractères. *
+* str_size = taille de la zone de chaînes de caractères. *
+* *
+* Description : Charge en mémoire la liste humaine des symboles (32 bits). *
+* *
+* Retour : Bilan de l'opération. *
+* *
+* Remarques : - *
+* *
+******************************************************************************/
+
+bool load_elf_symbol_table_32(elf_format *format, const off_t *sym_start, const off_t *sym_size, const off_t *str_start, const off_t *str_size)
+{
+ off_t iter; /* Boucle de parcours */
+ Elf32_Sym symbol; /* Symbole ELF lu */
+
+ if (*sym_size % sizeof(Elf32_Sym) != 0) return false;
+
+ for (iter = *sym_start; iter < (*sym_start + *sym_size); iter += sizeof(Elf32_Sym))
+ {
+ memcpy(&symbol, &EXE_FORMAT(format)->content[iter], sizeof(Elf32_Sym));
+
+ if (!(ELF32_ST_TYPE(symbol.st_info) == STT_FUNC
+ || (ELF32_ST_TYPE(symbol.st_info) == STT_NOTYPE
+ && ELF32_ST_BIND(symbol.st_info) == STB_GLOBAL))) continue;
+
+ if (symbol.st_value == 0) continue;
+
+ /* Sécurité anti-débordements */
+ if (symbol.st_name >= *str_size) continue;
+
+ /* Si le symbole possède un nom... */
+ if (strlen(&EXE_FORMAT(format)->content[*str_start + symbol.st_name]) > 0)
+ {
+ format->symbols = (elf_symbol *)realloc(format->symbols, ++format->sym_count * sizeof(elf_symbol));
+
+ format->symbols[format->sym_count - 1].name = &EXE_FORMAT(format)->content[*str_start + symbol.st_name];
+ format->symbols[format->sym_count - 1].address = symbol.st_value;
+
+ }
+
+ }
+
+ return true;
+
+}
+
+
+/******************************************************************************
+* *
+* Paramètres : format = description de l'exécutable à compléter. *
+* sym_start = début de la zone à traiter. *
+* sym_size = taille de la zone à traiter. *
+* str_start = début de la zone de chaîne de caractères. *
+* str_size = taille de la zone de chaînes de caractères. *
+* *
+* Description : Charge en mémoire la liste humaine des symboles (64 bits). *
+* *
+* Retour : Bilan de l'opération. *
+* *
+* Remarques : - *
+* *
+******************************************************************************/
+
+bool load_elf_symbol_table_64(elf_format *format, const off_t *sym_start, const off_t *sym_size, const off_t *str_start, const off_t *str_size)
+{
+ off_t iter; /* Boucle de parcours */
+ Elf64_Sym symbol; /* Symbole ELF lu */
+
+ if (*sym_size % sizeof(Elf64_Sym) != 0) return false;
+
+ for (iter = *sym_start; iter < (*sym_start + *sym_size); iter += sizeof(Elf64_Sym))
+ {
+ memcpy(&symbol, &EXE_FORMAT(format)->content[iter], sizeof(Elf64_Sym));
+
+ if (!(ELF64_ST_TYPE(symbol.st_info) == STT_FUNC
+ || (ELF64_ST_TYPE(symbol.st_info) == STT_NOTYPE
+ && ELF64_ST_BIND(symbol.st_info) == STB_GLOBAL))) continue;
+
+ if (symbol.st_value == 0) continue;
+
+ /* Sécurité anti-débordements */
+ if (symbol.st_name >= *str_size) continue;
+
+ /* Si le symbole possède un nom... */
+ if (strlen(&EXE_FORMAT(format)->content[*str_start + symbol.st_name]) > 0)
+ {
+ format->symbols = (elf_symbol *)realloc(format->symbols, ++format->sym_count * sizeof(elf_symbol));
+
+ format->symbols[format->sym_count - 1].name = &EXE_FORMAT(format)->content[*str_start + symbol.st_name];
+ format->symbols[format->sym_count - 1].address = symbol.st_value;
+
+ }
+
+ }
+
+ return true;
+
+}
+
+
+/******************************************************************************
+* *
+* Paramètres : format = informations chargées à consulter. *
+* comments = liste des commentaires à insérer. [OUT] *
+* offsets = liste des indices des commentaires. [OUT] *
+* count = taille des listes construites. [OUT] *
+* *
+* Description : Récupère tous les commentaires à insérer dans le code. *
+* *
+* Retour : - *
+* *
+* Remarques : - *
+* *
+******************************************************************************/
+
+void get_elf_symbol_comments(const elf_format *format, char ***comments, uint64_t **offsets, size_t *count)
+{
+ size_t i; /* Boucle de parcours */
+ size_t len; /* Longueur d'une désignation */
+
+ if (format->sym_count > 0)
+ {
+ *comments = (char **)calloc(*count + format->sym_count, sizeof(char *));
+ *offsets = (uint64_t *)calloc(*count + format->sym_count, sizeof(uint64_t));
+
+ for (i = 0; i < format->sym_count; i++)
+ {
+ len = strlen(format->symbols[i].name);
+
+ (*comments)[i] = (char *)calloc(len + 9, sizeof(char));
+ snprintf((*comments)[i], len + 9, "&lt;%s&gt;", format->symbols[i].name);
+
+ (*offsets)[i] = format->symbols[i].address;
+
+ }
+
+ *count += format->sym_count;
+
+ }
+
+}
diff --git a/src/format/elf/symbol.h b/src/format/elf/symbol.h
new file mode 100644
index 0000000..0a8f203
--- /dev/null
+++ b/src/format/elf/symbol.h
@@ -0,0 +1,40 @@
+
+/* OpenIDA - Outil d'analyse de fichiers binaires
+ * symbol.h - prototypes pour la gestion des symboles 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/>.
+ */
+
+
+#ifndef _FORMAT_ELF_SYMBOL_H
+#define _FORMAT_ELF_SYMBOL_H
+
+
+#include "e_elf.h"
+
+
+
+/* Charge en mémoire la liste humaine des symboles. */
+bool load_elf_symbols(elf_format *);
+
+/* Récupère tous les commentaires à insérer dans le code. */
+void get_elf_symbol_comments(const elf_format *, char ***, uint64_t **, size_t *);
+
+
+
+#endif /* _FORMAT_ELF_SYMBOL_H */
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