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|
/*
| Copyright (C) 2007 Christophe Fergeau <teuf@gnome.org>
|
| The code in this file is heavily based on the proof-of-concept code
| written by wtbw
|
| Redistribution and use in source and binary forms, with or without
| modification, are permitted provided that the following conditions are met:
|
| 1. Redistributions of source code must retain the above copyright
| notice, this list of conditions and the following disclaimer.
| 2. Redistributions in binary form must reproduce the above copyright
| notice, this list of conditions and the following disclaimer in the
| documentation and/or other materials provided with the distribution.
| 3. The name of the author may not be used to endorse or promote
| products derived from this software without specific prior written
| permission.
|
| THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
| IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
| OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
| IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
| INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
| BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
| OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
| ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
| OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
| OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
| OF SUCH DAMAGE.
|
|
| iTunes and iPod are trademarks of Apple
|
| This product is not supported/written/published by Apple!
*/
#ifdef HAVE_CONFIG_H
# include <config.h>
#endif
#include <glib.h>
#include <errno.h>
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <sys/mman.h>
#include <sys/stat.h>
#include "itdb.h"
#include "itdb_sha1.h"
static unsigned char *
calculate_db_checksum (const char *itdb_path, guint64 fwid)
{
int fd;
struct stat stat_buf;
int result;
unsigned char *itdb_data;
unsigned char *checksum;
fd = open (itdb_path, O_RDONLY);
if (fd < 0) {
g_warning ("Couldn't open %s", itdb_path);
return NULL;
}
result = fstat (fd, &stat_buf);
if (result != 0) {
g_warning ("Couldn't stat %s", itdb_path);
close (fd);
return NULL;
}
if (stat_buf.st_size < 0x80) {
g_warning ("%s is too small", itdb_path);
close (fd);
return NULL;
}
itdb_data = mmap (NULL, stat_buf.st_size,
PROT_READ | PROT_WRITE,
MAP_PRIVATE, fd, 0);
if (itdb_data == MAP_FAILED) {
g_warning ("Couldn't mmap %s", itdb_path);
close (fd);
return NULL;
}
/* Those fields must be zero'ed out for the sha1 calculation */
memset(itdb_data+0x18, 0, 8);
memset(itdb_data+0x32, 0, 20);
memset(itdb_data+0x58, 0, 20);
checksum = itdb_compute_hash (fwid, itdb_data, stat_buf.st_size, NULL);
munmap (itdb_data, stat_buf.st_size);
close (fd);
return checksum;
}
static gboolean write_checksum_to_file (const char *path,
const unsigned char *checksum,
size_t size)
{
FILE *f;
int result;
size_t count;
f = fopen (path, "rb+");
if (f == NULL) {
return FALSE;
}
result = fseek (f, 0x58, SEEK_SET);
if (result != 0) {
fclose (f);
return FALSE;
}
count = fwrite (checksum, size, 1, f);
fclose (f);
return (count == 1);
}
int
main (int argc, char *argv[])
{
char *itdb_path;
guint64 firewire_id;
unsigned char *checksum;
int i;
if (argc < 3) {
g_print ("Usage: %s <mountpoint> <firewire_id> [write]\n"
" firewire_id in hexadecimal, e.g. 00A745....\n"
" If any third argument is given, the checksum is written back to the iTunesDB.\n",
g_basename(argv[0]));
exit (0);
}
errno = 0;
firewire_id = strtoull (argv[2], NULL, 16);
if (errno != 0) {
g_warning ("Couldn't parse %s as a firewire ID\n", argv[2]);
exit (0);
}
itdb_path = itdb_get_itunesdb_path (argv[1]);
checksum = calculate_db_checksum (itdb_path, firewire_id);
if (argc >= 4)
{
gboolean success;
success = write_checksum_to_file (itdb_path, checksum, 20);
if (!success)
{
g_warning ("Couldn't write checksum back to file '%s'\n",
argv[1]);
}
}
g_free (itdb_path);
if (checksum == NULL) {
g_warning ("Couldn't compute checksum");
exit (0);
}
for (i = 0; i < strlen ((char *)checksum); i++) {
g_print ("%02x ", checksum[i]);
}
g_print ("\n");
g_free (checksum);
return 0;
}
|
