/**
* \brief Close the DVD and clean up the library.
*
* \param dvdcss a \e libdvdcss instance.
* \return zero in case of success, a negative value otherwise.
*
* This function closes the DVD device and frees all the memory allocated
* by \e libdvdcss. On return, the #dvdcss_t is invalidated and may not be
* used again.
*/
LIBDVDCSS_EXPORT int dvdcss_close ( dvdcss_t dvdcss )
{
dvd_title_t *p_title;
int i_ret;
/* Free our list of keys */
p_title = dvdcss->p_titles;
while( p_title )
{
dvd_title_t *p_tmptitle = p_title->p_next;
free( p_title );
p_title = p_tmptitle;
}
i_ret = _dvdcss_close( dvdcss );
if( i_ret < 0 )
{
return i_ret;
}
free( dvdcss->psz_device );
free( dvdcss );
return 0;
}
/**
* \brief Open a DVD device or directory and return a dvdcss instance.
*
* \param psz_target a string containing the target name, for instance
* "/dev/hdc" or "E:".
* \return a handle to a dvdcss instance or NULL on error.
*
* Initialize the \e libdvdcss library and open the requested DVD device or
* directory. \e libdvdcss checks whether ioctls can be performed on the disc,
* and when possible, the disc key is retrieved.
*
* dvdcss_open() returns a handle to be used for all subsequent \e libdvdcss
* calls. If an error occurred, NULL is returned.
*/
LIBDVDCSS_EXPORT dvdcss_t dvdcss_open ( char *psz_target,
struct svfs_ops *svfs_ops )
{
char psz_buffer[PATH_MAX];
int i_ret;
char *psz_method = getenv( "DVDCSS_METHOD" );
char *psz_verbose = getenv( "DVDCSS_VERBOSE" );
char *psz_cache = getenv( "DVDCSS_CACHE" );
#ifndef WIN32
char *psz_raw_device = getenv( "DVDCSS_RAW_DEVICE" );
#endif
dvdcss_t dvdcss;
/*
* Allocate the library structure
*/
dvdcss = malloc( sizeof( struct dvdcss_s ) );
if( dvdcss == NULL )
{
return NULL;
}
/*
* Initialize structure with default values
*/
#ifndef WIN32
dvdcss->i_raw_fd = -1;
#endif
dvdcss->p_titles = NULL;
dvdcss->psz_device = (char *)strdup( psz_target );
dvdcss->psz_error = "no error";
dvdcss->i_method = DVDCSS_METHOD_KEY;
dvdcss->psz_cachefile[0] = '\0';
dvdcss->b_debug = 0;
dvdcss->b_errors = 0;
/*
* Find verbosity from DVDCSS_VERBOSE environment variable
*/
if( psz_verbose != NULL )
{
int i = atoi( psz_verbose );
if( i >= 2 ) dvdcss->b_debug = i;
if( i >= 1 ) dvdcss->b_errors = 1;
}
/*
* Find method from DVDCSS_METHOD environment variable
*/
if( psz_method != NULL )
{
if( !strncmp( psz_method, "key", 4 ) )
{
dvdcss->i_method = DVDCSS_METHOD_KEY;
}
else if( !strncmp( psz_method, "disc", 5 ) )
{
dvdcss->i_method = DVDCSS_METHOD_DISC;
}
else if( !strncmp( psz_method, "title", 5 ) )
{
dvdcss->i_method = DVDCSS_METHOD_TITLE;
}
else
{
print_error( dvdcss, "unknown decrypt method, please choose "
"from 'title', 'key' or 'disc'" );
free( dvdcss->psz_device );
free( dvdcss );
return NULL;
}
}
/*
* If DVDCSS_CACHE was not set, try to guess a default value
*/
if( psz_cache == NULL || psz_cache[0] == '\0' )
{
#ifdef HAVE_DIRECT_H
typedef HRESULT( WINAPI *SHGETFOLDERPATH )
( HWND, int, HANDLE, DWORD, LPTSTR );
# define CSIDL_FLAG_CREATE 0x8000
# define CSIDL_APPDATA 0x1A
# define SHGFP_TYPE_CURRENT 0
char psz_home[MAX_PATH];
HINSTANCE p_dll;
SHGETFOLDERPATH p_getpath;
*psz_home = '\0';
/* Load the shfolder dll to retrieve SHGetFolderPath */
p_dll = LoadLibrary( "shfolder.dll" );
if( p_dll )
{
p_getpath = (void*)GetProcAddress( p_dll, "SHGetFolderPathA" );
if( p_getpath )
{
/* Get the "Application Data" folder for the current user */
if( p_getpath( NULL, CSIDL_APPDATA | CSIDL_FLAG_CREATE,
NULL, SHGFP_TYPE_CURRENT, psz_home ) == S_OK )
{
FreeLibrary( p_dll );
}
else
{
*psz_home = '\0';
}
}
FreeLibrary( p_dll );
}
/* Cache our keys in
* C:\Documents and Settings\$USER\Application Data\dvdcss\ */
if( *psz_home )
{
snprintf( psz_buffer, PATH_MAX, "%s/dvdcss", psz_home );
psz_buffer[PATH_MAX-1] = '\0';
psz_cache = psz_buffer;
}
#else
char *psz_home = NULL;
# ifdef HAVE_PWD_H
struct passwd *p_pwd;
/* Try looking in password file for home dir. */
p_pwd = getpwuid(getuid());
if( p_pwd )
{
psz_home = p_pwd->pw_dir;
}
# endif
if( psz_home == NULL )
{
psz_home = getenv( "HOME" );
}
if( psz_home == NULL )
{
psz_home = getenv( "USERPROFILE" );
}
/* Cache our keys in ${HOME}/.dvdcss/ */
if( psz_home )
{
snprintf( psz_buffer, PATH_MAX, "%s/.dvdcss", psz_home );
psz_buffer[PATH_MAX-1] = '\0';
psz_cache = psz_buffer;
}
#endif
}
/*
* Find cache dir from the DVDCSS_CACHE environment variable
*/
if( psz_cache != NULL )
{
if( psz_cache[0] == '\0' || !strcmp( psz_cache, "off" ) )
{
psz_cache = NULL;
}
/* Check that we can add the ID directory and the block filename */
else if( strlen( psz_cache ) + 1 + 32 + 1 + (KEY_SIZE * 2) + 10 + 1
> PATH_MAX )
{
print_error( dvdcss, "cache directory name is too long" );
psz_cache = NULL;
}
}
/*
* Open device
*/
_dvdcss_check( dvdcss );
i_ret = _dvdcss_open( dvdcss, svfs_ops );
if( i_ret < 0 )
{
free( dvdcss->psz_device );
free( dvdcss );
return NULL;
}
if(svfs_ops == NULL) {
dvdcss->b_scrambled = 1; /* Assume the worst */
dvdcss->b_ioctls = _dvdcss_use_ioctls( dvdcss );
if( dvdcss->b_ioctls )
{
i_ret = _dvdcss_test( dvdcss );
if( i_ret < 0 )
{
/* Disable the CSS ioctls and hope that it works? */
print_debug( dvdcss,
"could not check whether the disc was scrambled" );
dvdcss->b_ioctls = 0;
}
else
{
print_debug( dvdcss, i_ret ? "disc is scrambled"
: "disc is unscrambled" );
dvdcss->b_scrambled = i_ret;
}
}
} else {
dvdcss->b_scrambled = 0;
dvdcss->b_ioctls = 0;
}
/* If disc is CSS protected and the ioctls work, authenticate the drive */
if( dvdcss->b_scrambled && dvdcss->b_ioctls )
{
i_ret = _dvdcss_disckey( dvdcss );
if( i_ret < 0 )
{
_dvdcss_close( dvdcss );
free( dvdcss->psz_device );
free( dvdcss );
return NULL;
}
}
/* If the cache is enabled, write the cache directory tag */
if( psz_cache )
{
char *psz_tag = "Signature: 8a477f597d28d172789f06886806bc55\r\n"
"# This file is a cache directory tag created by libdvdcss.\r\n"
"# For information about cache directory tags, see:\r\n"
"# http://www.brynosaurus.com/cachedir/\r\n";
char psz_tagfile[PATH_MAX + 1 + 12 + 1];
int i_fd;
sprintf( psz_tagfile, "%s/CACHEDIR.TAG", psz_cache );
i_fd = open( psz_tagfile, O_RDWR|O_CREAT, 0644 );
if( i_fd >= 0 )
{
write( i_fd, psz_tag, strlen(psz_tag) );
close( i_fd );
}
}
/* If the cache is enabled, extract a unique disc ID */
if( psz_cache )
{
uint8_t p_sector[DVDCSS_BLOCK_SIZE];
char psz_debug[PATH_MAX + 30];
char psz_key[1 + KEY_SIZE * 2 + 1];
char *psz_title;
uint8_t *psz_serial;
int i;
/* We read sector 0. If it starts with 0x000001ba (BE), we are
* reading a VOB file, and we should not cache anything. */
i_ret = dvdcss->pf_seek( dvdcss, 0 );
if( i_ret != 0 )
{
goto nocache;
}
i_ret = dvdcss->pf_read( dvdcss, p_sector, 1 );
if( i_ret != 1 )
{
goto nocache;
}
if( p_sector[0] == 0x00 && p_sector[1] == 0x00
&& p_sector[2] == 0x01 && p_sector[3] == 0xba )
{
goto nocache;
}
/* The data we are looking for is at sector 16 (32768 bytes):
* - offset 40: disc title (32 uppercase chars)
* - offset 813: manufacturing date + serial no (16 digits) */
i_ret = dvdcss->pf_seek( dvdcss, 16 );
if( i_ret != 16 )
{
goto nocache;
}
i_ret = dvdcss->pf_read( dvdcss, p_sector, 1 );
if( i_ret != 1 )
{
goto nocache;
}
/* Get the disc title */
psz_title = (char *)p_sector + 40;
psz_title[32] = '\0';
for( i = 0 ; i < 32 ; i++ )
{
if( psz_title[i] <= ' ' )
{
psz_title[i] = '\0';
break;
}
else if( psz_title[i] == '/' || psz_title[i] == '\\' )
{
psz_title[i] = '-';
}
}
/* Get the date + serial */
psz_serial = p_sector + 813;
psz_serial[16] = '\0';
/* Check that all characters are digits, otherwise convert. */
for( i = 0 ; i < 16 ; i++ )
{
if( psz_serial[i] < '0' || psz_serial[i] > '9' )
{
char psz_tmp[16 + 1];
sprintf( psz_tmp,
"%.2"PRIx8"%.2"PRIx8"%.2"PRIx8"%.2"PRIx8"%.2"PRIx8"%.2"PRIx8"%.2"PRIx8"%.2"PRIx8"",
psz_serial[0], psz_serial[1], psz_serial[2],
psz_serial[3], psz_serial[4], psz_serial[5],
psz_serial[6], psz_serial[7] );
memcpy( psz_serial, psz_tmp, 16 );
break;
}
}
/* Get disk key, since some discs have got same title, manufacturing
* date and serial number, but different keys */
if( dvdcss->b_scrambled )
{
psz_key[0] = '-';
for( i = 0; i < KEY_SIZE; i++ )
{
sprintf( &psz_key[1+i*2], "%.2"PRIx8, dvdcss->css.p_disc_key[i] );
}
psz_key[1 + KEY_SIZE * 2] = '\0';
}
else
{
psz_key[0] = 0;
}
/* We have a disc name or ID, we can create the cache dir */
i = sprintf( dvdcss->psz_cachefile, "%s", psz_cache );
#if !defined( WIN32 ) || defined( SYS_CYGWIN )
i_ret = mkdir( dvdcss->psz_cachefile, 0755 );
#else
i_ret = mkdir( dvdcss->psz_cachefile );
#endif
if( i_ret < 0 && errno != EEXIST )
{
print_error( dvdcss, "failed creating cache directory" );
dvdcss->psz_cachefile[0] = '\0';
goto nocache;
}
i += sprintf( dvdcss->psz_cachefile + i, "/%s-%s%s", psz_title,
psz_serial, psz_key );
#if !defined( WIN32 ) || defined( SYS_CYGWIN )
i_ret = mkdir( dvdcss->psz_cachefile, 0755 );
#else
i_ret = mkdir( dvdcss->psz_cachefile );
#endif
if( i_ret < 0 && errno != EEXIST )
{
print_error( dvdcss, "failed creating cache subdirectory" );
dvdcss->psz_cachefile[0] = '\0';
goto nocache;
}
i += sprintf( dvdcss->psz_cachefile + i, "/");
/* Pointer to the filename we will use. */
dvdcss->psz_block = dvdcss->psz_cachefile + i;
sprintf( psz_debug, "using CSS key cache dir: %s",
dvdcss->psz_cachefile );
print_debug( dvdcss, psz_debug );
}
nocache:
#ifndef WIN32
if( psz_raw_device != NULL )
{
_dvdcss_raw_open( dvdcss, psz_raw_device );
}
#endif
/* Seek at the beginning, just for safety. */
dvdcss->pf_seek( dvdcss, 0 );
return dvdcss;
}