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authorChristophe Grenier <grenier@cgsecurity.org>2015-04-05 12:04:06 +0200
committerChristophe Grenier <grenier@cgsecurity.org>2015-04-05 12:04:06 +0200
commit9ee3ed591caebdf099e22ea4561b8be1c349c1c0 (patch)
tree1fd2e4533f6e3df1c9de954306d11733bb5cda3e
parenta07f9b6fc8b265f8e1b83cbf3421ef8502a6290a (diff)
PhotoRec: recover .gsm files (prone to false positive)
-rw-r--r--src/Makefile.am1
-rw-r--r--src/file_gsm.c129
-rw-r--r--src/file_list.c2
3 files changed, 132 insertions, 0 deletions
diff --git a/src/Makefile.am b/src/Makefile.am
index 1117745..9ce3005 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -139,6 +139,7 @@ file_C = filegen.c \
file_gm6.c \
file_gp5.c \
file_gpg.c \
+ file_gsm.c \
file_gz.c \
file_hdf.c \
file_hds.c \
diff --git a/src/file_gsm.c b/src/file_gsm.c
new file mode 100644
index 0000000..aaeb878
--- /dev/null
+++ b/src/file_gsm.c
@@ -0,0 +1,129 @@
+/*
+
+ File: file_gsm.c
+
+ Copyright (C) 2014 Christophe GRENIER <grenier@cgsecurity.org>
+
+ This software 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 2 of the License, or
+ (at your option) any later version.
+
+ This program 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 this program; if not, write the Free Software Foundation, Inc., 51
+ Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+
+ */
+
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+#ifdef HAVE_STRING_H
+#include <string.h>
+#endif
+#include <stdio.h>
+#include "types.h"
+#include "filegen.h"
+#include "common.h"
+#include "log.h"
+#include "memmem.h"
+
+static void register_header_check_gsm(file_stat_t *file_stat);
+
+const file_hint_t file_hint_gsm= {
+ .extension="gsm",
+ .description="Group Speciale Mobile GSM 06.10",
+ .min_header_distance=0,
+ .max_filesize=PHOTOREC_MAX_FILE_SIZE,
+ .recover=1,
+ .enable_by_default=0,
+ .register_header_check=&register_header_check_gsm
+};
+
+struct block_header
+{
+ unsigned char marker;
+ unsigned char payload[32];
+} __attribute__ ((__packed__));
+
+static data_check_t data_check_gsm(const unsigned char *buffer, const unsigned int buffer_size, file_recovery_t *file_recovery)
+{
+ while(file_recovery->calculated_file_size + buffer_size/2 >= file_recovery->file_size &&
+ file_recovery->calculated_file_size + sizeof(struct block_header) < file_recovery->file_size + buffer_size/2)
+ {
+ const unsigned int i=file_recovery->calculated_file_size - file_recovery->file_size + buffer_size/2;
+ const struct block_header *hdr=(const struct block_header *)&buffer[i];
+ if(hdr->marker < 0xd0 || hdr->marker > 0xdf)
+ return DC_STOP;
+ file_recovery->calculated_file_size+=sizeof(struct block_header);
+ }
+ return DC_CONTINUE;
+}
+
+static int header_check_gsm(const unsigned char *buffer, const unsigned int buffer_size, const unsigned int safe_header_only, const file_recovery_t *file_recovery, file_recovery_t *file_recovery_new)
+{
+ const struct block_header *hdr;
+ unsigned int i=0;
+ if(file_recovery->file_stat!=NULL
+ && file_recovery->file_stat->file_hint==&file_hint_gsm)
+ return 0;
+ for(i=0, hdr=(const struct block_header *)buffer;
+ i * sizeof(struct block_header) < file_recovery_new->blocksize;
+ i++, hdr++)
+ {
+ if(hdr->marker < 0xd0 || hdr->marker > 0xdf)
+ return 0;
+ }
+ if(i<3)
+ return 0;
+
+ reset_file_recovery(file_recovery_new);
+ file_recovery_new->extension=file_hint_gsm.extension;
+ file_recovery_new->min_filesize=sizeof(struct block_header);
+ file_recovery_new->calculated_file_size=0;
+ file_recovery_new->data_check=&data_check_gsm;
+ file_recovery_new->file_check=&file_check_size;
+ return 1;
+}
+
+static void register_header_check_gsm(file_stat_t *file_stat)
+{
+ static const unsigned char gsm_header1[1]={ 0xd0 };
+ static const unsigned char gsm_header2[1]={ 0xd1 };
+ static const unsigned char gsm_header3[1]={ 0xd2 };
+ static const unsigned char gsm_header4[1]={ 0xd3 };
+ static const unsigned char gsm_header5[1]={ 0xd4 };
+ static const unsigned char gsm_header6[1]={ 0xd5 };
+ static const unsigned char gsm_header7[1]={ 0xd6 };
+ static const unsigned char gsm_header8[1]={ 0xd7 };
+ static const unsigned char gsm_header9[1]={ 0xd8 };
+ static const unsigned char gsm_header10[1]={ 0xd9 };
+ static const unsigned char gsm_header11[1]={ 0xda };
+ static const unsigned char gsm_header12[1]={ 0xdb };
+ static const unsigned char gsm_header13[1]={ 0xdc };
+ static const unsigned char gsm_header14[1]={ 0xdd };
+ static const unsigned char gsm_header15[1]={ 0xde };
+ static const unsigned char gsm_header16[1]={ 0xdf };
+
+ register_header_check(0, gsm_header1, sizeof(gsm_header1), &header_check_gsm, file_stat);
+ register_header_check(0, gsm_header2, sizeof(gsm_header2), &header_check_gsm, file_stat);
+ register_header_check(0, gsm_header3, sizeof(gsm_header3), &header_check_gsm, file_stat);
+ register_header_check(0, gsm_header4, sizeof(gsm_header4), &header_check_gsm, file_stat);
+ register_header_check(0, gsm_header5, sizeof(gsm_header5), &header_check_gsm, file_stat);
+ register_header_check(0, gsm_header6, sizeof(gsm_header6), &header_check_gsm, file_stat);
+ register_header_check(0, gsm_header7, sizeof(gsm_header7), &header_check_gsm, file_stat);
+ register_header_check(0, gsm_header8, sizeof(gsm_header8), &header_check_gsm, file_stat);
+ register_header_check(0, gsm_header9, sizeof(gsm_header9), &header_check_gsm, file_stat);
+ register_header_check(0, gsm_header10, sizeof(gsm_header10), &header_check_gsm, file_stat);
+ register_header_check(0, gsm_header11, sizeof(gsm_header11), &header_check_gsm, file_stat);
+ register_header_check(0, gsm_header12, sizeof(gsm_header12), &header_check_gsm, file_stat);
+ register_header_check(0, gsm_header13, sizeof(gsm_header13), &header_check_gsm, file_stat);
+ register_header_check(0, gsm_header14, sizeof(gsm_header14), &header_check_gsm, file_stat);
+ register_header_check(0, gsm_header15, sizeof(gsm_header15), &header_check_gsm, file_stat);
+ register_header_check(0, gsm_header16, sizeof(gsm_header16), &header_check_gsm, file_stat);
+}
diff --git a/src/file_list.c b/src/file_list.c
index b20f894..439abe9 100644
--- a/src/file_list.c
+++ b/src/file_list.c
@@ -141,6 +141,7 @@ extern const file_hint_t file_hint_gif;
extern const file_hint_t file_hint_gm6;
extern const file_hint_t file_hint_gp5;
extern const file_hint_t file_hint_gpg;
+extern const file_hint_t file_hint_gsm;
extern const file_hint_t file_hint_gz;
extern const file_hint_t file_hint_hdf;
extern const file_hint_t file_hint_hds;
@@ -421,6 +422,7 @@ file_enable_t list_file_enable[]=
{ .enable=0, .file_hint=&file_hint_gm6 },
{ .enable=0, .file_hint=&file_hint_gp5 },
{ .enable=0, .file_hint=&file_hint_gpg },
+ { .enable=0, .file_hint=&file_hint_gsm },
{ .enable=0, .file_hint=&file_hint_gz },
{ .enable=0, .file_hint=&file_hint_hdf },
{ .enable=0, .file_hint=&file_hint_hds },