* libdvdcss.c: DVD reading library.
*****************************************************************************
* Copyright (C) 1998-2001 VideoLAN
- * $Id: libdvdcss.c,v 1.10 2001/07/27 01:05:17 sam Exp $
+ * $Id: libdvdcss.c,v 1.30 2002/01/23 03:15:31 stef Exp $
*
* Authors: Stéphane Borel <stef@via.ecp.fr>
* Samuel Hocevar <sam@zoy.org>
+ * Håkan Hjort <d95hjort@dtek.chalmers.se>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
/*****************************************************************************
* Preamble
*****************************************************************************/
-#include "defs.h"
-
#include <stdio.h>
#include <stdlib.h>
+#include <string.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
+#include <videolan/vlc.h>
+
#ifdef HAVE_UNISTD_H
# include <unistd.h>
#endif
#if defined( WIN32 )
-# include <io.h>
-# include "input_iovec.h"
+# include <io.h> /* read() */
#else
# include <sys/uio.h> /* struct iovec */
#endif
-#include "config.h"
-#include "common.h"
+#if defined( WIN32 )
+# include "input_iovec.h"
+#endif
#include "videolan/dvdcss.h"
#include "libdvdcss.h"
*****************************************************************************/
static int _dvdcss_open ( dvdcss_handle, char *psz_target );
static int _dvdcss_close ( dvdcss_handle );
-static int _dvdcss_seek ( dvdcss_handle, int i_blocks );
-static int _dvdcss_read ( dvdcss_handle, void *p_buffer, int i_blocks );
static int _dvdcss_readv ( dvdcss_handle, struct iovec *p_iovec, int i_blocks );
/*****************************************************************************
static int _win32_dvdcss_aclose ( int i_fd );
static int _win32_dvdcss_aseek ( int i_fd, int i_blocks, int i_method );
static int _win32_dvdcss_aread ( int i_fd, void *p_data, int i_blocks );
+#else
+static int _dvdcss_raw_open ( dvdcss_handle, char *psz_target );
#endif
/*****************************************************************************
* dvdcss_open: initialize library, open a DVD device, crack CSS key
*****************************************************************************/
-extern dvdcss_handle dvdcss_open ( char *psz_target, int i_flags )
+extern dvdcss_handle dvdcss_open ( char *psz_target )
{
- int i_ret;
+ struct stat fileinfo;
+ int i_ret;
+
+ char *psz_method = getenv( "DVDCSS_METHOD" );
+ char *psz_verbose = getenv( "DVDCSS_VERBOSE" );
+#ifndef WIN32
+ char *psz_raw_device = getenv( "DVDCSS_RAW_DEVICE" );
+#endif
dvdcss_handle dvdcss;
dvdcss = malloc( sizeof( struct dvdcss_s ) );
if( dvdcss == NULL )
{
- if( ! (i_flags & DVDCSS_INIT_QUIET) )
- {
- DVDCSS_ERROR( "could not initialize library" );
- }
-
return NULL;
}
- /* Initialize structure */
+ /* Initialize structure with default values */
dvdcss->p_titles = NULL;
- dvdcss->b_debug = i_flags & DVDCSS_INIT_DEBUG;
- dvdcss->b_errors = !(i_flags & DVDCSS_INIT_QUIET);
dvdcss->psz_error = "no error";
+ dvdcss->i_method = DVDCSS_METHOD_TITLE;
+ dvdcss->b_debug = 0;
+ 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
+ {
+ _dvdcss_error( dvdcss, "unknown decrypt method, please choose "
+ "from 'title', 'key' or 'disc'" );
+ free( dvdcss );
+ return NULL;
+ }
+ }
+
+ /* Find verbosity from DVDCSS_VERBOSE environment variable */
+ if( psz_verbose != NULL )
+ {
+ switch( atoi( psz_verbose ) )
+ {
+ case 0:
+ dvdcss->b_errors = 0;
+ break;
+ case 1:
+ break;
+ case 2:
+ dvdcss->b_debug = 1;
+ break;
+ default:
+ _dvdcss_error( dvdcss, "unknown verbose level, please choose "
+ "from '0', '1' or '2'" );
+ free( dvdcss );
+ return NULL;
+ break;
+ }
+ }
+ /* Open device */
i_ret = _dvdcss_open( dvdcss, psz_target );
if( i_ret < 0 )
{
return NULL;
}
- i_ret = CSSTest( dvdcss );
- if( i_ret < 0 )
+#if defined( WIN32 )
+ /* it's not possible to stat a drive letter. Fake a block device */
+ fileinfo.st_mode = S_IFBLK;
+#else
+ if( stat( psz_target, &fileinfo ) < 0 )
{
- _dvdcss_error( dvdcss, "css test failed" );
- _dvdcss_close( dvdcss );
- free( dvdcss );
- return NULL;
+ _dvdcss_error( dvdcss, "dvdcss: can't stat target" );
}
+#endif
- dvdcss->b_encrypted = i_ret;
+ if( S_ISBLK( fileinfo.st_mode ) ||
+ S_ISCHR( fileinfo.st_mode ) )
+ {
+ i_ret = CSSTest( dvdcss );
+ if( i_ret < 0 )
+ {
+ _dvdcss_error( dvdcss, "CSS test failed" );
+ /* Disable the CSS ioctls and hope that it works? */
+ dvdcss->b_ioctls = 0;
+ dvdcss->b_encrypted = 1;
+ }
+ else
+ {
+ dvdcss->b_ioctls = 1;
+ dvdcss->b_encrypted = i_ret;
+ }
+ }
+ else
+ {
+ _dvdcss_debug( dvdcss, "dvdcss: file mode, using title method" );
+ dvdcss->i_method = DVDCSS_METHOD_TITLE;
+ dvdcss->b_ioctls = 0;
+ dvdcss->b_encrypted = 1;
+ }
- /* If drive is encrypted, crack its key */
- if( dvdcss->b_encrypted )
+ /* If disc is CSS protected and the ioctls work, authenticate the drive */
+ if( dvdcss->b_encrypted && dvdcss->b_ioctls )
{
- i_ret = CSSInit( dvdcss );
+ i_ret = CSSGetDiscKey( dvdcss );
if( i_ret < 0 )
{
free( dvdcss );
return NULL;
}
+
+ memset( dvdcss->css.p_unenc_key, 0, KEY_SIZE );
+ }
+ memset( dvdcss->css.p_title_key, 0, KEY_SIZE );
+
+#ifndef WIN32
+ if( psz_raw_device != NULL )
+ {
+ _dvdcss_raw_open( dvdcss, psz_raw_device );
}
+#endif
return dvdcss;
}
/*****************************************************************************
* dvdcss_seek: seek into the device
*****************************************************************************/
-extern int dvdcss_seek ( dvdcss_handle dvdcss, int i_blocks )
+extern int dvdcss_seek ( dvdcss_handle dvdcss, int i_blocks, int i_flags )
{
+ /* title cracking method is too slow to be used at each seek */
+ if( ( ( i_flags & DVDCSS_SEEK_MPEG )
+ && ( dvdcss->i_method != DVDCSS_METHOD_TITLE ) )
+ && dvdcss->b_encrypted )
+ {
+ int i_ret;
+
+ /* Crack or decrypt CSS title key for current VTS */
+ i_ret = CSSGetTitleKey( dvdcss, i_blocks );
+
+ if( i_ret < 0 )
+ {
+ _dvdcss_error( dvdcss, "fatal error in vts css key" );
+ return i_ret;
+ }
+ else if( i_ret > 0 )
+ {
+ _dvdcss_error( dvdcss, "decryption unavailable" );
+ return -1;
+ }
+ }
+ else if( i_flags & DVDCSS_SEEK_KEY )
+ {
+ /* check the title key */
+ if( dvdcss_title( dvdcss, i_blocks ) )
+ {
+ return -1;
+ }
+ }
+
return _dvdcss_seek( dvdcss, i_blocks );
}
/*****************************************************************************
- * dvdcss_title: crack the current title key if needed
+ * dvdcss_title: crack or decrypt the current title key if needed
+ *****************************************************************************
+ * This function should only be called by dvdcss_seek and should eventually
+ * not be external if possible.
*****************************************************************************/
extern int dvdcss_title ( dvdcss_handle dvdcss, int i_block )
{
dvd_title_t *p_title;
- dvd_key_t p_key;
- int i_ret;
+ dvd_title_t *p_newtitle;
+ int i_ret;
if( ! dvdcss->b_encrypted )
{
&& p_title->i_startlb == i_block )
{
/* We've already cracked this key, nothing to do */
+ memcpy( dvdcss->css.p_title_key, p_title->p_key, sizeof(dvd_key_t) );
return 0;
}
- /* Crack CSS title key for current VTS */
- i_ret = CSSGetKey( dvdcss, i_block, p_key );
+ /* Crack or decrypt CSS title key for current VTS */
+ i_ret = CSSGetTitleKey( dvdcss, i_block );
if( i_ret < 0 )
{
return -1;
}
- /* Add key to keytable if it isn't empty */
- if( p_key[0] | p_key[1] | p_key[2] | p_key[3] | p_key[4] )
+ /* Find our spot in the list */
+ p_newtitle = NULL;
+ p_title = dvdcss->p_titles;
+ while( ( p_title != NULL ) && ( p_title->i_startlb < i_block ) )
{
- dvd_title_t *p_newtitle;
-
- /* Find our spot in the list */
- p_newtitle = NULL;
- p_title = dvdcss->p_titles;
- while( p_title != NULL
- && p_title->i_startlb < i_block )
- {
- p_newtitle = p_title;
- p_title = p_title->p_next;
- }
+ p_newtitle = p_title;
+ p_title = p_title->p_next;
+ }
- /* Save the found title */
- p_title = p_newtitle;
+ /* Save the found title */
+ p_title = p_newtitle;
- /* Write in the new title and its key */
- p_newtitle = malloc( sizeof( dvd_title_t ) );
- p_newtitle->i_startlb = i_block;
- memcpy( p_newtitle->p_key, p_key, KEY_SIZE );
+ /* Write in the new title and its key */
+ p_newtitle = malloc( sizeof( dvd_title_t ) );
+ p_newtitle->i_startlb = i_block;
+ memcpy( p_newtitle->p_key, dvdcss->css.p_title_key, KEY_SIZE );
- /* Link the new title, either at the beginning or inside the list */
- if( p_title == NULL )
- {
- dvdcss->p_titles = p_newtitle;
- p_newtitle->p_next = NULL;
- }
- else
- {
- p_newtitle->p_next = p_title->p_next;
- p_title->p_next = p_newtitle;
- }
+ /* Link the new title, either at the beginning or inside the list */
+ if( p_title == NULL )
+ {
+ dvdcss->p_titles = p_newtitle;
+ p_newtitle->p_next = NULL;
+ }
+ else
+ {
+ p_newtitle->p_next = p_title->p_next;
+ p_title->p_next = p_newtitle;
}
return 0;
}
+#define Pkey dvdcss->css.p_title_key
/*****************************************************************************
* dvdcss_read: read data from the device, decrypt if requested
*****************************************************************************/
int i_blocks,
int i_flags )
{
- dvd_title_t *p_title;
int i_ret, i_index;
i_ret = _dvdcss_read( dvdcss, p_buffer, i_blocks );
return i_ret;
}
- /* find our key */
- p_title = dvdcss->p_titles;
- while( p_title != NULL
- && p_title->p_next
- && p_title->p_next->i_startlb < dvdcss->i_seekpos )
+ /* For what we believe is an unencrypted title,
+ check that there are no encrypted blocks */
+ if( !( Pkey[0] | Pkey[1] | Pkey[2] | Pkey[3] | Pkey[4] ) )
{
- p_title = p_title->p_next;
- }
-
- if( p_title == NULL )
- {
- /* no css key found to use, so no decryption to do */
- return 0;
+ for( i_index = i_ret; i_index; i_index-- )
+ {
+ if( ((u8*)p_buffer)[0x14] & 0x30 )
+ {
+ _dvdcss_error( dvdcss, "no key but found encrypted block" );
+ /* Only return the initial range of unscrambled blocks? */
+ i_ret = i_index;
+ /* or fail completely? return 0; */
+ }
+ (u8*)p_buffer += DVDCSS_BLOCK_SIZE;
+ }
}
/* Decrypt the blocks we managed to read */
for( i_index = i_ret; i_index; i_index-- )
{
- CSSDescrambleSector( p_title->p_key, p_buffer );
+ CSSDescrambleSector( dvdcss->css.p_title_key, p_buffer );
((u8*)p_buffer)[0x14] &= 0x8f;
(u8*)p_buffer += DVDCSS_BLOCK_SIZE;
}
}
/*****************************************************************************
- * dvdcss_readv: read data to an iovec structure, decrypt if reaquested
+ * dvdcss_readv: read data to an iovec structure, decrypt if requested
*****************************************************************************/
extern int dvdcss_readv ( dvdcss_handle dvdcss, void *p_iovec,
int i_blocks,
int i_flags )
{
#define P_IOVEC ((struct iovec*)p_iovec)
- dvd_title_t *p_title;
int i_ret, i_index;
void *iov_base;
size_t iov_len;
return i_ret;
}
- /* Find our key */
- p_title = dvdcss->p_titles;
- while( p_title != NULL
- && p_title->p_next != NULL
- && p_title->p_next->i_startlb < dvdcss->i_seekpos )
- {
- p_title = p_title->p_next;
- }
-
- if( p_title == NULL )
- {
- /* no css key found to use, so no decryption to do */
- return 0;
- }
/* Initialize loop for decryption */
iov_base = P_IOVEC->iov_base;
iov_len = P_IOVEC->iov_len;
}
- CSSDescrambleSector( p_title->p_key, iov_base );
+ CSSDescrambleSector( dvdcss->css.p_title_key, iov_base );
((u8*)iov_base)[0x14] &= 0x8f;
(u8*)iov_base += DVDCSS_BLOCK_SIZE;
return i_ret;
#undef P_IOVEC
}
+#undef Pkey
/*****************************************************************************
* dvdcss_close: close the DVD device and clean up the library
{
char psz_dvd[7];
_snprintf( psz_dvd, 7, "\\\\.\\%c:", psz_target[0] );
+
+ /* To have access to ioctls, we need read and write access to the
+ * device. This is only allowed if you have administrator priviledges
+ * so we allow for a fallback method where ioctls are not available but
+ * we at least have read access to the device.
+ * (See Microsoft Q241374: Read and Write Access Required for SCSI
+ * Pass Through Requests) */
(HANDLE) dvdcss->i_fd =
CreateFile( psz_dvd, GENERIC_READ | GENERIC_WRITE,
FILE_SHARE_READ | FILE_SHARE_WRITE,
- NULL, OPEN_EXISTING, 0, NULL );
+ NULL, OPEN_EXISTING,
+ FILE_FLAG_RANDOM_ACCESS, NULL );
+
+ if( (HANDLE) dvdcss->i_fd == INVALID_HANDLE_VALUE )
+ (HANDLE) dvdcss->i_fd =
+ CreateFile( psz_dvd, GENERIC_READ, FILE_SHARE_READ,
+ NULL, OPEN_EXISTING,
+ FILE_FLAG_RANDOM_ACCESS, NULL );
+
if( (HANDLE) dvdcss->i_fd == INVALID_HANDLE_VALUE )
{
_dvdcss_error( dvdcss, "failed opening device" );
dvdcss->i_readv_buf_size = 0;
#else
- dvdcss->i_fd = open( psz_target, 0 );
+ dvdcss->i_fd = dvdcss->i_read_fd = open( psz_target, 0 );
if( dvdcss->i_fd == -1 )
{
return 0;
}
+#ifndef WIN32
+static int _dvdcss_raw_open ( dvdcss_handle dvdcss, char *psz_target )
+{
+ dvdcss->i_raw_fd = open( psz_target, 0 );
+
+ if( dvdcss->i_raw_fd == -1 )
+ {
+ _dvdcss_error( dvdcss, "failed opening raw device, continuing" );
+ return -1;
+ }
+ else
+ {
+ dvdcss->i_read_fd = dvdcss->i_raw_fd;
+ }
+
+ return 0;
+}
+#endif
+
static int _dvdcss_close ( dvdcss_handle dvdcss )
{
#if defined( WIN32 )
#else
close( dvdcss->i_fd );
+ if( dvdcss->i_raw_fd >= 0 )
+ {
+ close( dvdcss->i_raw_fd );
+ dvdcss->i_raw_fd = -1;
+ }
+
#endif
return 0;
}
-static int _dvdcss_seek ( dvdcss_handle dvdcss, int i_blocks )
+int _dvdcss_seek ( dvdcss_handle dvdcss, int i_blocks )
{
#if defined( WIN32 )
+ dvdcss->i_seekpos = i_blocks;
+
if( WIN2K )
{
LARGE_INTEGER li_read;
return ( _win32_dvdcss_aseek( dvdcss->i_fd, i_blocks, SEEK_SET ) );
}
#else
- off_t i_read;
+ off_t i_read;
dvdcss->i_seekpos = i_blocks;
- i_read = lseek( dvdcss->i_fd,
+ i_read = lseek( dvdcss->i_read_fd,
(off_t)i_blocks * (off_t)DVDCSS_BLOCK_SIZE, SEEK_SET );
return i_read / DVDCSS_BLOCK_SIZE;
}
-static int _dvdcss_read ( dvdcss_handle dvdcss, void *p_buffer, int i_blocks )
+int _dvdcss_read ( dvdcss_handle dvdcss, void *p_buffer, int i_blocks )
{
#if defined( WIN32 )
if( WIN2K )
#else
int i_bytes;
- i_bytes = read( dvdcss->i_fd, p_buffer,
+ i_bytes = read( dvdcss->i_read_fd, p_buffer,
(size_t)i_blocks * DVDCSS_BLOCK_SIZE );
return i_bytes / DVDCSS_BLOCK_SIZE;
#endif
return i_read;
#else
- i_read = readv( dvdcss->i_fd, p_iovec, i_blocks );
+ i_read = readv( dvdcss->i_read_fd, p_iovec, i_blocks );
return i_read / DVDCSS_BLOCK_SIZE;
#endif
/* transfer the next 64kb (_win32_dvdcss_aread is called recursively)
* We need to check the status of the read on return */
- if( _win32_dvdcss_aread( i_fd, p_data + 32 * DVDCSS_BLOCK_SIZE,
+ if( _win32_dvdcss_aread( i_fd, (u8*) p_data + 32 * DVDCSS_BLOCK_SIZE,
i_blocks - 32) < 0 )
{
return -1;
projects / vlc / blobdiff