1 /*****************************************************************************
2 * libdvdcss.c: DVD reading library.
3 *****************************************************************************
4 * Copyright (C) 1998-2001 VideoLAN
5 * $Id: libdvdcss.c,v 1.14 2001/08/06 13:28:00 sam Exp $
7 * Authors: Stéphane Borel <stef@via.ecp.fr>
8 * Samuel Hocevar <sam@zoy.org>
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License as published by
12 * the Free Software Foundation; either version 2 of the License, or
13 * (at your option) any later version.
15 * This program is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 * GNU General Public License for more details.
20 * You should have received a copy of the GNU General Public License
21 * along with this program; if not, write to the Free Software
22 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111, USA.
23 *****************************************************************************/
25 /*****************************************************************************
27 *****************************************************************************/
33 #include <sys/types.h>
42 # include <io.h> /* read() */
44 # include <sys/uio.h> /* struct iovec */
51 # include "input_iovec.h"
54 #include "videolan/dvdcss.h"
55 #include "libdvdcss.h"
58 /*****************************************************************************
60 *****************************************************************************/
61 static int _dvdcss_open ( dvdcss_handle, char *psz_target );
62 static int _dvdcss_close ( dvdcss_handle );
63 static int _dvdcss_seek ( dvdcss_handle, int i_blocks );
64 static int _dvdcss_read ( dvdcss_handle, void *p_buffer, int i_blocks );
65 static int _dvdcss_readv ( dvdcss_handle, struct iovec *p_iovec, int i_blocks );
67 /*****************************************************************************
68 * Local prototypes, win32 specific
69 *****************************************************************************/
71 static int _win32_dvdcss_readv ( int i_fd, struct iovec *p_iovec,
72 int i_num_buffers, char *p_tmp_buffer );
73 static int _win32_dvdcss_aopen ( char c_drive, dvdcss_handle dvdcss );
74 static int _win32_dvdcss_aclose ( int i_fd );
75 static int _win32_dvdcss_aseek ( int i_fd, int i_blocks, int i_method );
76 static int _win32_dvdcss_aread ( int i_fd, void *p_data, int i_blocks );
79 /*****************************************************************************
80 * dvdcss_open: initialize library, open a DVD device, crack CSS key
81 *****************************************************************************/
82 extern dvdcss_handle dvdcss_open ( char *psz_target, int i_flags )
88 /* Allocate the library structure */
89 dvdcss = malloc( sizeof( struct dvdcss_s ) );
92 if( ! (i_flags & DVDCSS_INIT_QUIET) )
94 DVDCSS_ERROR( "could not initialize library" );
100 /* Initialize structure */
101 dvdcss->p_titles = NULL;
102 dvdcss->b_debug = i_flags & DVDCSS_INIT_DEBUG;
103 dvdcss->b_errors = !(i_flags & DVDCSS_INIT_QUIET);
104 dvdcss->psz_error = "no error";
106 i_ret = _dvdcss_open( dvdcss, psz_target );
113 i_ret = CSSTest( dvdcss );
116 _dvdcss_error( dvdcss, "css test failed" );
117 _dvdcss_close( dvdcss );
122 dvdcss->b_encrypted = i_ret;
124 /* If drive is encrypted, crack its key */
125 if( dvdcss->b_encrypted )
127 i_ret = CSSInit( dvdcss );
131 _dvdcss_close( dvdcss );
140 /*****************************************************************************
141 * dvdcss_error: return the last libdvdcss error message
142 *****************************************************************************/
143 extern char * dvdcss_error ( dvdcss_handle dvdcss )
145 return dvdcss->psz_error;
148 /*****************************************************************************
149 * dvdcss_seek: seek into the device
150 *****************************************************************************/
151 extern int dvdcss_seek ( dvdcss_handle dvdcss, int i_blocks )
153 return _dvdcss_seek( dvdcss, i_blocks );
156 /*****************************************************************************
157 * dvdcss_title: crack the current title key if needed
158 *****************************************************************************/
159 extern int dvdcss_title ( dvdcss_handle dvdcss, int i_block )
161 dvd_title_t *p_title;
165 if( ! dvdcss->b_encrypted )
170 //fprintf( stderr, "looking for a key for offset %i\n", i_block );
172 /* Check if we've already cracked this key */
173 p_title = dvdcss->p_titles;
174 while( p_title != NULL
175 && p_title->p_next != NULL
176 && p_title->p_next->i_startlb <= i_block )
178 p_title = p_title->p_next;
182 && p_title->i_startlb == i_block )
184 /* We've already cracked this key, nothing to do */
188 /* Crack CSS title key for current VTS */
189 i_ret = CSSGetKey( dvdcss, i_block, p_key );
193 _dvdcss_error( dvdcss, "fatal error in vts css key" );
198 _dvdcss_error( dvdcss, "decryption unavailable" );
202 //fprintf( stderr, "cracked key is %.2x %.2x %.2x %.2x %.2x\n",
203 // p_key[0], p_key[1], p_key[2], p_key[3], p_key[4] );
205 /* Add key to keytable if it isn't empty */
206 if( p_key[0] | p_key[1] | p_key[2] | p_key[3] | p_key[4] )
208 dvd_title_t *p_newtitle;
210 /* Find our spot in the list */
212 p_title = dvdcss->p_titles;
213 while( p_title != NULL
214 && p_title->i_startlb < i_block )
216 p_newtitle = p_title;
217 p_title = p_title->p_next;
220 /* Save the found title */
221 p_title = p_newtitle;
223 /* Write in the new title and its key */
224 p_newtitle = malloc( sizeof( dvd_title_t ) );
225 p_newtitle->i_startlb = i_block;
226 memcpy( p_newtitle->p_key, p_key, KEY_SIZE );
228 /* Link the new title, either at the beginning or inside the list */
229 if( p_title == NULL )
231 dvdcss->p_titles = p_newtitle;
232 p_newtitle->p_next = NULL;
236 p_newtitle->p_next = p_title->p_next;
237 p_title->p_next = p_newtitle;
244 /*****************************************************************************
245 * dvdcss_read: read data from the device, decrypt if requested
246 *****************************************************************************/
247 extern int dvdcss_read ( dvdcss_handle dvdcss, void *p_buffer,
251 dvd_title_t *p_title;
254 i_ret = _dvdcss_read( dvdcss, p_buffer, i_blocks );
257 || !dvdcss->b_encrypted
258 || !(i_flags & DVDCSS_READ_DECRYPT) )
264 p_title = dvdcss->p_titles;
265 while( p_title != NULL
267 && p_title->p_next->i_startlb <= dvdcss->i_seekpos )
269 p_title = p_title->p_next;
272 if( p_title == NULL )
274 /* no css key found to use, so no decryption to do */
278 /* Decrypt the blocks we managed to read */
279 for( i_index = i_ret; i_index; i_index-- )
281 CSSDescrambleSector( p_title->p_key, p_buffer );
282 ((u8*)p_buffer)[0x14] &= 0x8f;
283 (u8*)p_buffer += DVDCSS_BLOCK_SIZE;
289 /*****************************************************************************
290 * dvdcss_readv: read data to an iovec structure, decrypt if reaquested
291 *****************************************************************************/
292 extern int dvdcss_readv ( dvdcss_handle dvdcss, void *p_iovec,
296 #define P_IOVEC ((struct iovec*)p_iovec)
297 dvd_title_t *p_title;
302 i_ret = _dvdcss_readv( dvdcss, P_IOVEC, i_blocks );
305 || !dvdcss->b_encrypted
306 || !(i_flags & DVDCSS_READ_DECRYPT) )
312 p_title = dvdcss->p_titles;
313 while( p_title != NULL
314 && p_title->p_next != NULL
315 && p_title->p_next->i_startlb <= dvdcss->i_seekpos )
317 p_title = p_title->p_next;
320 if( p_title == NULL )
322 /* no css key found to use, so no decryption to do */
326 /* Initialize loop for decryption */
327 iov_base = P_IOVEC->iov_base;
328 iov_len = P_IOVEC->iov_len;
330 /* Decrypt the blocks we managed to read */
331 for( i_index = i_ret; i_index; i_index-- )
333 /* Check that iov_len is a multiple of 2048 */
334 if( iov_len & 0x7ff )
339 while( iov_len == 0 )
342 iov_base = P_IOVEC->iov_base;
343 iov_len = P_IOVEC->iov_len;
346 CSSDescrambleSector( p_title->p_key, iov_base );
347 ((u8*)iov_base)[0x14] &= 0x8f;
349 (u8*)iov_base += DVDCSS_BLOCK_SIZE;
350 (u8*)iov_len -= DVDCSS_BLOCK_SIZE;
357 /*****************************************************************************
358 * dvdcss_close: close the DVD device and clean up the library
359 *****************************************************************************/
360 extern int dvdcss_close ( dvdcss_handle dvdcss )
362 dvd_title_t *p_title;
365 /* Free our list of keys */
366 p_title = dvdcss->p_titles;
369 dvd_title_t *p_tmptitle = p_title->p_next;
371 p_title = p_tmptitle;
374 i_ret = _dvdcss_close( dvdcss );
386 /* Following functions are local */
388 static int _dvdcss_open ( dvdcss_handle dvdcss, char *psz_target )
394 _snprintf( psz_dvd, 7, "\\\\.\\%c:", psz_target[0] );
395 (HANDLE) dvdcss->i_fd =
396 CreateFile( psz_dvd, GENERIC_READ | GENERIC_WRITE,
397 FILE_SHARE_READ | FILE_SHARE_WRITE,
398 NULL, OPEN_EXISTING, 0, NULL );
399 if( (HANDLE) dvdcss->i_fd == INVALID_HANDLE_VALUE )
401 _dvdcss_error( dvdcss, "failed opening device" );
407 dvdcss->i_fd = _win32_dvdcss_aopen( psz_target[0], dvdcss );
408 if( dvdcss->i_fd == -1 )
410 _dvdcss_error( dvdcss, "failed opening device" );
415 /* initialise readv temporary buffer */
416 dvdcss->p_readv_buffer = NULL;
417 dvdcss->i_readv_buf_size = 0;
420 dvdcss->i_fd = open( psz_target, 0 );
422 if( dvdcss->i_fd == -1 )
424 _dvdcss_error( dvdcss, "failed opening device" );
433 static int _dvdcss_close ( dvdcss_handle dvdcss )
438 CloseHandle( (HANDLE) dvdcss->i_fd );
442 _win32_dvdcss_aclose( dvdcss->i_fd );
445 /* Free readv temporary buffer */
446 if( dvdcss->p_readv_buffer )
448 free( dvdcss->p_readv_buffer );
449 dvdcss->p_readv_buffer = NULL;
450 dvdcss->i_readv_buf_size = 0;
454 close( dvdcss->i_fd );
461 static int _dvdcss_seek ( dvdcss_handle dvdcss, int i_blocks )
464 dvdcss->i_seekpos = i_blocks;
468 LARGE_INTEGER li_read;
470 #ifndef INVALID_SET_FILE_POINTER
471 #define INVALID_SET_FILE_POINTER ((DWORD)-1)
474 li_read.QuadPart = (LONGLONG)i_blocks * DVDCSS_BLOCK_SIZE;
476 li_read.LowPart = SetFilePointer( (HANDLE) dvdcss->i_fd,
478 &li_read.HighPart, FILE_BEGIN );
479 if( (li_read.LowPart == INVALID_SET_FILE_POINTER)
480 && GetLastError() != NO_ERROR)
482 li_read.QuadPart = -DVDCSS_BLOCK_SIZE;
485 li_read.QuadPart /= DVDCSS_BLOCK_SIZE;
486 return (int)li_read.QuadPart;
490 return ( _win32_dvdcss_aseek( dvdcss->i_fd, i_blocks, SEEK_SET ) );
495 dvdcss->i_seekpos = i_blocks;
497 i_read = lseek( dvdcss->i_fd,
498 (off_t)i_blocks * (off_t)DVDCSS_BLOCK_SIZE, SEEK_SET );
500 return i_read / DVDCSS_BLOCK_SIZE;
505 static int _dvdcss_read ( dvdcss_handle dvdcss, void *p_buffer, int i_blocks )
512 if( !ReadFile( (HANDLE) dvdcss->i_fd, p_buffer,
513 i_blocks * DVDCSS_BLOCK_SIZE,
514 (LPDWORD)&i_bytes, NULL ) )
518 return i_bytes / DVDCSS_BLOCK_SIZE;
522 return _win32_dvdcss_aread( dvdcss->i_fd, p_buffer, i_blocks );
528 i_bytes = read( dvdcss->i_fd, p_buffer,
529 (size_t)i_blocks * DVDCSS_BLOCK_SIZE );
530 return i_bytes / DVDCSS_BLOCK_SIZE;
535 static int _dvdcss_readv ( dvdcss_handle dvdcss, struct iovec *p_iovec,
541 /* Check the size of the readv temp buffer, just in case we need to
542 * realloc something bigger */
543 if( dvdcss->i_readv_buf_size < i_blocks * DVDCSS_BLOCK_SIZE )
545 dvdcss->i_readv_buf_size = i_blocks * DVDCSS_BLOCK_SIZE;
547 if( dvdcss->p_readv_buffer ) free( dvdcss->p_readv_buffer );
549 /* Allocate a buffer which will be used as a temporary storage
551 dvdcss->p_readv_buffer = malloc( dvdcss->i_readv_buf_size );
552 if( !dvdcss->p_readv_buffer )
554 _dvdcss_error( dvdcss, " failed (readv)" );
559 i_read = _win32_dvdcss_readv( dvdcss->i_fd, p_iovec, i_blocks,
560 dvdcss->p_readv_buffer );
564 i_read = readv( dvdcss->i_fd, p_iovec, i_blocks );
565 return i_read / DVDCSS_BLOCK_SIZE;
573 /*****************************************************************************
574 * _win32_dvdcss_readv: vectored read using ReadFile for Win2K and
575 * _win32_dvdcss_aread for win9x
576 *****************************************************************************/
577 static int _win32_dvdcss_readv( int i_fd, struct iovec *p_iovec,
578 int i_num_buffers, char *p_tmp_buffer )
581 int i_blocks, i_blocks_total = 0;
583 for( i_index = i_num_buffers; i_index; i_index-- )
585 i_blocks_total += p_iovec[i_index-1].iov_len;
588 if( i_blocks_total <= 0 ) return 0;
590 i_blocks_total /= DVDCSS_BLOCK_SIZE;
594 unsigned long int i_bytes;
595 if( !ReadFile( (HANDLE)i_fd, p_tmp_buffer,
596 i_blocks_total * DVDCSS_BLOCK_SIZE, &i_bytes, NULL ) )
599 /* The read failed... too bad.
600 As in the posix spec the file postition is left
601 unspecified after a failure */
603 i_blocks = i_bytes / DVDCSS_BLOCK_SIZE;
607 i_blocks = _win32_dvdcss_aread( i_fd, p_tmp_buffer, i_blocks_total );
610 return -1; /* idem */
614 /* We just have to copy the content of the temp buffer into the iovecs */
616 i_blocks_total = i_blocks;
617 while( i_blocks_total > 0 )
619 memcpy( p_iovec[i_index].iov_base,
620 &p_tmp_buffer[(i_blocks - i_blocks_total) * DVDCSS_BLOCK_SIZE],
621 p_iovec[i_index].iov_len );
622 /* if we read less blocks than asked, we'll just end up copying
623 garbage, this isn't an issue as we return the number of
624 blocks actually read */
625 i_blocks_total -= ( p_iovec[i_index].iov_len / DVDCSS_BLOCK_SIZE );
632 /*****************************************************************************
633 * _win32_dvdcss_aopen: open dvd drive (load aspi and init w32_aspidev
635 *****************************************************************************/
636 static int _win32_dvdcss_aopen( char c_drive, dvdcss_handle dvdcss )
640 struct w32_aspidev *fd;
641 int i, j, i_hostadapters;
642 long (*lpGetSupport)( void );
643 long (*lpSendCommand)( void* );
645 hASPI = LoadLibrary( "wnaspi32.dll" );
648 _dvdcss_error( dvdcss, "unable to load wnaspi32.dll" );
652 (FARPROC) lpGetSupport = GetProcAddress( hASPI, "GetASPI32SupportInfo" );
653 (FARPROC) lpSendCommand = GetProcAddress( hASPI, "SendASPI32Command" );
655 if(lpGetSupport == NULL || lpSendCommand == NULL )
657 _dvdcss_debug( dvdcss, "unable to get aspi function pointers" );
658 FreeLibrary( hASPI );
662 dwSupportInfo = lpGetSupport();
664 if( HIBYTE( LOWORD ( dwSupportInfo ) ) == SS_NO_ADAPTERS )
666 _dvdcss_debug( dvdcss, "no host adapters found (aspi)" );
667 FreeLibrary( hASPI );
671 if( HIBYTE( LOWORD ( dwSupportInfo ) ) != SS_COMP )
673 _dvdcss_error( dvdcss, "unable to initalize aspi layer" );
674 FreeLibrary( hASPI );
678 i_hostadapters = LOBYTE( LOWORD( dwSupportInfo ) );
679 if( i_hostadapters == 0 )
681 FreeLibrary( hASPI );
685 fd = malloc( sizeof( struct w32_aspidev ) );
688 FreeLibrary( hASPI );
693 fd->hASPI = (long) hASPI;
694 fd->lpSendCommand = lpSendCommand;
696 c_drive = c_drive > 'Z' ? c_drive - 'a' : c_drive - 'A';
698 for( i = 0; i < i_hostadapters; i++ )
700 for( j = 0; j < 15; j++ )
702 struct SRB_GetDiskInfo srbDiskInfo;
704 srbDiskInfo.SRB_Cmd = SC_GET_DISK_INFO;
705 srbDiskInfo.SRB_HaId = i;
706 srbDiskInfo.SRB_Flags = 0;
707 srbDiskInfo.SRB_Hdr_Rsvd = 0;
708 srbDiskInfo.SRB_Target = j;
709 srbDiskInfo.SRB_Lun = 0;
711 lpSendCommand( (void*) &srbDiskInfo );
713 if( (srbDiskInfo.SRB_Status == SS_COMP) &&
714 (srbDiskInfo.SRB_Int13HDriveInfo == c_drive) )
716 fd->i_sid = MAKEWORD( i, j );
723 FreeLibrary( hASPI );
724 _dvdcss_debug( dvdcss, "unable to get haid and target (aspi)" );
728 /*****************************************************************************
729 * _win32_dvdcss_aclose: close dvd drive (unload aspi and free w32_aspidev
731 *****************************************************************************/
732 static int _win32_dvdcss_aclose( int i_fd )
734 struct w32_aspidev *fd = (struct w32_aspidev *) i_fd;
736 FreeLibrary( (HMODULE) fd->hASPI );
737 free( (void*) i_fd );
742 /*****************************************************************************
743 * _win32_dvdcss_aseek: aspi version of _dvdcss_seek
745 * returns the number of blocks read.
746 *****************************************************************************/
747 static int _win32_dvdcss_aseek( int i_fd, int i_blocks, int i_method )
750 char sz_buf[ DVDCSS_BLOCK_SIZE ];
751 struct w32_aspidev *fd = (struct w32_aspidev *) i_fd;
753 i_old_blocks = fd->i_blocks;
754 fd->i_blocks = i_blocks;
756 if( _win32_dvdcss_aread( i_fd, sz_buf, 1 ) == -1 )
758 fd->i_blocks = i_old_blocks;
767 /*****************************************************************************
768 * _win32_dvdcss_aread: aspi version of _dvdcss_read
770 * returns the number of blocks read.
771 *****************************************************************************/
772 static int _win32_dvdcss_aread( int i_fd, void *p_data, int i_blocks )
775 struct SRB_ExecSCSICmd ssc;
776 struct w32_aspidev *fd = (struct w32_aspidev *) i_fd;
778 /* Create the transfer completion event */
779 hEvent = CreateEvent( NULL, TRUE, FALSE, NULL );
785 memset( &ssc, 0, sizeof( ssc ) );
787 ssc.SRB_Cmd = SC_EXEC_SCSI_CMD;
788 ssc.SRB_Flags = SRB_DIR_IN | SRB_EVENT_NOTIFY;
789 ssc.SRB_HaId = LOBYTE( fd->i_sid );
790 ssc.SRB_Target = HIBYTE( fd->i_sid );
791 ssc.SRB_SenseLen = SENSE_LEN;
793 ssc.SRB_PostProc = (LPVOID) hEvent;
794 ssc.SRB_BufPointer = p_data;
797 ssc.CDBByte[0] = 0xA8; /* RAW */
798 ssc.CDBByte[2] = (UCHAR) (fd->i_blocks >> 24);
799 ssc.CDBByte[3] = (UCHAR) (fd->i_blocks >> 16) & 0xff;
800 ssc.CDBByte[4] = (UCHAR) (fd->i_blocks >> 8) & 0xff;
801 ssc.CDBByte[5] = (UCHAR) (fd->i_blocks) & 0xff;
803 /* We have to break down the reads into 64kb pieces (ASPI restriction) */
806 ssc.SRB_BufLen = 32 * DVDCSS_BLOCK_SIZE;
810 /* Initiate transfer */
811 ResetEvent( hEvent );
812 fd->lpSendCommand( (void*) &ssc );
814 /* transfer the next 64kb (_win32_dvdcss_aread is called recursively)
815 * We need to check the status of the read on return */
816 if( _win32_dvdcss_aread( i_fd, (u8*) p_data + 32 * DVDCSS_BLOCK_SIZE,
824 /* This is the last transfer */
825 ssc.SRB_BufLen = i_blocks * DVDCSS_BLOCK_SIZE;
826 ssc.CDBByte[9] = (UCHAR) i_blocks;
827 fd->i_blocks += i_blocks;
829 /* Initiate transfer */
830 ResetEvent( hEvent );
831 fd->lpSendCommand( (void*) &ssc );
835 /* If the command has still not been processed, wait until it's finished */
836 if( ssc.SRB_Status == SS_PENDING )
838 WaitForSingleObject( hEvent, INFINITE );
840 CloseHandle( hEvent );
842 /* check that the transfer went as planned */
843 if( ssc.SRB_Status != SS_COMP )