1 /*****************************************************************************
2 * libdvdcss.c: DVD reading library.
3 *****************************************************************************
4 * Copyright (C) 1998-2001 VideoLAN
5 * $Id: libdvdcss.c,v 1.11 2001/07/28 02:17:37 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 *****************************************************************************/
32 #include <sys/types.h>
42 # include "input_iovec.h"
44 # include <sys/uio.h> /* struct iovec */
50 #include "videolan/dvdcss.h"
51 #include "libdvdcss.h"
54 /*****************************************************************************
56 *****************************************************************************/
57 static int _dvdcss_open ( dvdcss_handle, char *psz_target );
58 static int _dvdcss_close ( dvdcss_handle );
59 static int _dvdcss_seek ( dvdcss_handle, int i_blocks );
60 static int _dvdcss_read ( dvdcss_handle, void *p_buffer, int i_blocks );
61 static int _dvdcss_readv ( dvdcss_handle, struct iovec *p_iovec, int i_blocks );
63 /*****************************************************************************
64 * Local prototypes, win32 specific
65 *****************************************************************************/
67 static int _win32_dvdcss_readv ( int i_fd, struct iovec *p_iovec,
68 int i_num_buffers, char *p_tmp_buffer );
69 static int _win32_dvdcss_aopen ( char c_drive, dvdcss_handle dvdcss );
70 static int _win32_dvdcss_aclose ( int i_fd );
71 static int _win32_dvdcss_aseek ( int i_fd, int i_blocks, int i_method );
72 static int _win32_dvdcss_aread ( int i_fd, void *p_data, int i_blocks );
75 /*****************************************************************************
76 * dvdcss_open: initialize library, open a DVD device, crack CSS key
77 *****************************************************************************/
78 extern dvdcss_handle dvdcss_open ( char *psz_target, int i_flags )
84 /* Allocate the library structure */
85 dvdcss = malloc( sizeof( struct dvdcss_s ) );
88 if( ! (i_flags & DVDCSS_INIT_QUIET) )
90 DVDCSS_ERROR( "could not initialize library" );
96 /* Initialize structure */
97 dvdcss->p_titles = NULL;
98 dvdcss->b_debug = i_flags & DVDCSS_INIT_DEBUG;
99 dvdcss->b_errors = !(i_flags & DVDCSS_INIT_QUIET);
100 dvdcss->psz_error = "no error";
102 i_ret = _dvdcss_open( dvdcss, psz_target );
109 i_ret = CSSTest( dvdcss );
112 _dvdcss_error( dvdcss, "css test failed" );
113 _dvdcss_close( dvdcss );
118 dvdcss->b_encrypted = i_ret;
120 /* If drive is encrypted, crack its key */
121 if( dvdcss->b_encrypted )
123 i_ret = CSSInit( dvdcss );
127 _dvdcss_close( dvdcss );
136 /*****************************************************************************
137 * dvdcss_error: return the last libdvdcss error message
138 *****************************************************************************/
139 extern char * dvdcss_error ( dvdcss_handle dvdcss )
141 return dvdcss->psz_error;
144 /*****************************************************************************
145 * dvdcss_seek: seek into the device
146 *****************************************************************************/
147 extern int dvdcss_seek ( dvdcss_handle dvdcss, int i_blocks )
149 return _dvdcss_seek( dvdcss, i_blocks );
152 /*****************************************************************************
153 * dvdcss_title: crack the current title key if needed
154 *****************************************************************************/
155 extern int dvdcss_title ( dvdcss_handle dvdcss, int i_block )
157 dvd_title_t *p_title;
161 if( ! dvdcss->b_encrypted )
166 //fprintf( stderr, "looking for a key for offset %i\n", i_block );
168 /* Check if we've already cracked this key */
169 p_title = dvdcss->p_titles;
170 while( p_title != NULL
171 && p_title->p_next != NULL
172 && p_title->p_next->i_startlb <= i_block )
174 p_title = p_title->p_next;
178 && p_title->i_startlb == i_block )
180 /* We've already cracked this key, nothing to do */
184 /* Crack CSS title key for current VTS */
185 i_ret = CSSGetKey( dvdcss, i_block, p_key );
189 _dvdcss_error( dvdcss, "fatal error in vts css key" );
194 _dvdcss_error( dvdcss, "decryption unavailable" );
198 //fprintf( stderr, "cracked key is %.2x %.2x %.2x %.2x %.2x\n",
199 // p_key[0], p_key[1], p_key[2], p_key[3], p_key[4] );
201 /* Add key to keytable if it isn't empty */
202 if( p_key[0] | p_key[1] | p_key[2] | p_key[3] | p_key[4] )
204 dvd_title_t *p_newtitle;
206 /* Find our spot in the list */
208 p_title = dvdcss->p_titles;
209 while( p_title != NULL
210 && p_title->i_startlb < i_block )
212 p_newtitle = p_title;
213 p_title = p_title->p_next;
216 /* Save the found title */
217 p_title = p_newtitle;
219 /* Write in the new title and its key */
220 p_newtitle = malloc( sizeof( dvd_title_t ) );
221 p_newtitle->i_startlb = i_block;
222 memcpy( p_newtitle->p_key, p_key, KEY_SIZE );
224 /* Link the new title, either at the beginning or inside the list */
225 if( p_title == NULL )
227 dvdcss->p_titles = p_newtitle;
228 p_newtitle->p_next = NULL;
232 p_newtitle->p_next = p_title->p_next;
233 p_title->p_next = p_newtitle;
240 /*****************************************************************************
241 * dvdcss_read: read data from the device, decrypt if requested
242 *****************************************************************************/
243 extern int dvdcss_read ( dvdcss_handle dvdcss, void *p_buffer,
247 dvd_title_t *p_title;
250 i_ret = _dvdcss_read( dvdcss, p_buffer, i_blocks );
253 || !dvdcss->b_encrypted
254 || !(i_flags & DVDCSS_READ_DECRYPT) )
260 p_title = dvdcss->p_titles;
261 while( p_title != NULL
263 && p_title->p_next->i_startlb <= dvdcss->i_seekpos )
265 p_title = p_title->p_next;
268 if( p_title == NULL )
270 /* no css key found to use, so no decryption to do */
274 /* Decrypt the blocks we managed to read */
275 for( i_index = i_ret; i_index; i_index-- )
277 CSSDescrambleSector( p_title->p_key, p_buffer );
278 ((u8*)p_buffer)[0x14] &= 0x8f;
279 (u8*)p_buffer += DVDCSS_BLOCK_SIZE;
285 /*****************************************************************************
286 * dvdcss_readv: read data to an iovec structure, decrypt if reaquested
287 *****************************************************************************/
288 extern int dvdcss_readv ( dvdcss_handle dvdcss, void *p_iovec,
292 #define P_IOVEC ((struct iovec*)p_iovec)
293 dvd_title_t *p_title;
298 i_ret = _dvdcss_readv( dvdcss, P_IOVEC, i_blocks );
301 || !dvdcss->b_encrypted
302 || !(i_flags & DVDCSS_READ_DECRYPT) )
308 p_title = dvdcss->p_titles;
309 while( p_title != NULL
310 && p_title->p_next != NULL
311 && p_title->p_next->i_startlb <= dvdcss->i_seekpos )
313 p_title = p_title->p_next;
316 if( p_title == NULL )
318 /* no css key found to use, so no decryption to do */
322 /* Initialize loop for decryption */
323 iov_base = P_IOVEC->iov_base;
324 iov_len = P_IOVEC->iov_len;
326 /* Decrypt the blocks we managed to read */
327 for( i_index = i_ret; i_index; i_index-- )
329 /* Check that iov_len is a multiple of 2048 */
330 if( iov_len & 0x7ff )
335 while( iov_len == 0 )
338 iov_base = P_IOVEC->iov_base;
339 iov_len = P_IOVEC->iov_len;
342 CSSDescrambleSector( p_title->p_key, iov_base );
343 ((u8*)iov_base)[0x14] &= 0x8f;
345 (u8*)iov_base += DVDCSS_BLOCK_SIZE;
346 (u8*)iov_len -= DVDCSS_BLOCK_SIZE;
353 /*****************************************************************************
354 * dvdcss_close: close the DVD device and clean up the library
355 *****************************************************************************/
356 extern int dvdcss_close ( dvdcss_handle dvdcss )
358 dvd_title_t *p_title;
361 /* Free our list of keys */
362 p_title = dvdcss->p_titles;
365 dvd_title_t *p_tmptitle = p_title->p_next;
367 p_title = p_tmptitle;
370 i_ret = _dvdcss_close( dvdcss );
382 /* Following functions are local */
384 static int _dvdcss_open ( dvdcss_handle dvdcss, char *psz_target )
390 _snprintf( psz_dvd, 7, "\\\\.\\%c:", psz_target[0] );
391 (HANDLE) dvdcss->i_fd =
392 CreateFile( psz_dvd, GENERIC_READ | GENERIC_WRITE,
393 FILE_SHARE_READ | FILE_SHARE_WRITE,
394 NULL, OPEN_EXISTING, 0, NULL );
395 if( (HANDLE) dvdcss->i_fd == INVALID_HANDLE_VALUE )
397 _dvdcss_error( dvdcss, "failed opening device" );
403 dvdcss->i_fd = _win32_dvdcss_aopen( psz_target[0], dvdcss );
404 if( dvdcss->i_fd == -1 )
406 _dvdcss_error( dvdcss, "failed opening device" );
411 /* initialise readv temporary buffer */
412 dvdcss->p_readv_buffer = NULL;
413 dvdcss->i_readv_buf_size = 0;
416 dvdcss->i_fd = open( psz_target, 0 );
418 if( dvdcss->i_fd == -1 )
420 _dvdcss_error( dvdcss, "failed opening device" );
429 static int _dvdcss_close ( dvdcss_handle dvdcss )
434 CloseHandle( (HANDLE) dvdcss->i_fd );
438 _win32_dvdcss_aclose( dvdcss->i_fd );
441 /* Free readv temporary buffer */
442 if( dvdcss->p_readv_buffer )
444 free( dvdcss->p_readv_buffer );
445 dvdcss->p_readv_buffer = NULL;
446 dvdcss->i_readv_buf_size = 0;
450 close( dvdcss->i_fd );
457 static int _dvdcss_seek ( dvdcss_handle dvdcss, int i_blocks )
462 LARGE_INTEGER li_read;
464 #ifndef INVALID_SET_FILE_POINTER
465 #define INVALID_SET_FILE_POINTER ((DWORD)-1)
468 li_read.QuadPart = (LONGLONG)i_blocks * DVDCSS_BLOCK_SIZE;
470 li_read.LowPart = SetFilePointer( (HANDLE) dvdcss->i_fd,
472 &li_read.HighPart, FILE_BEGIN );
473 if( (li_read.LowPart == INVALID_SET_FILE_POINTER)
474 && GetLastError() != NO_ERROR)
476 li_read.QuadPart = -DVDCSS_BLOCK_SIZE;
479 li_read.QuadPart /= DVDCSS_BLOCK_SIZE;
480 return (int)li_read.QuadPart;
484 return ( _win32_dvdcss_aseek( dvdcss->i_fd, i_blocks, SEEK_SET ) );
489 dvdcss->i_seekpos = i_blocks;
491 i_read = lseek( dvdcss->i_fd,
492 (off_t)i_blocks * (off_t)DVDCSS_BLOCK_SIZE, SEEK_SET );
494 return i_read / DVDCSS_BLOCK_SIZE;
499 static int _dvdcss_read ( dvdcss_handle dvdcss, void *p_buffer, int i_blocks )
506 if( !ReadFile( (HANDLE) dvdcss->i_fd, p_buffer,
507 i_blocks * DVDCSS_BLOCK_SIZE,
508 (LPDWORD)&i_bytes, NULL ) )
512 return i_bytes / DVDCSS_BLOCK_SIZE;
516 return _win32_dvdcss_aread( dvdcss->i_fd, p_buffer, i_blocks );
522 i_bytes = read( dvdcss->i_fd, p_buffer,
523 (size_t)i_blocks * DVDCSS_BLOCK_SIZE );
524 return i_bytes / DVDCSS_BLOCK_SIZE;
529 static int _dvdcss_readv ( dvdcss_handle dvdcss, struct iovec *p_iovec,
535 /* Check the size of the readv temp buffer, just in case we need to
536 * realloc something bigger */
537 if( dvdcss->i_readv_buf_size < i_blocks * DVDCSS_BLOCK_SIZE )
539 dvdcss->i_readv_buf_size = i_blocks * DVDCSS_BLOCK_SIZE;
541 if( dvdcss->p_readv_buffer ) free( dvdcss->p_readv_buffer );
543 /* Allocate a buffer which will be used as a temporary storage
545 dvdcss->p_readv_buffer = malloc( dvdcss->i_readv_buf_size );
546 if( !dvdcss->p_readv_buffer )
548 _dvdcss_error( dvdcss, " failed (readv)" );
553 i_read = _win32_dvdcss_readv( dvdcss->i_fd, p_iovec, i_blocks,
554 dvdcss->p_readv_buffer );
558 i_read = readv( dvdcss->i_fd, p_iovec, i_blocks );
559 return i_read / DVDCSS_BLOCK_SIZE;
567 /*****************************************************************************
568 * _win32_dvdcss_readv: vectored read using ReadFile for Win2K and
569 * _win32_dvdcss_aread for win9x
570 *****************************************************************************/
571 static int _win32_dvdcss_readv( int i_fd, struct iovec *p_iovec,
572 int i_num_buffers, char *p_tmp_buffer )
575 int i_blocks, i_blocks_total = 0;
577 for( i_index = i_num_buffers; i_index; i_index-- )
579 i_blocks_total += p_iovec[i_index-1].iov_len;
582 if( i_blocks_total <= 0 ) return 0;
584 i_blocks_total /= DVDCSS_BLOCK_SIZE;
588 unsigned long int i_bytes;
589 if( !ReadFile( (HANDLE)i_fd, p_tmp_buffer,
590 i_blocks_total * DVDCSS_BLOCK_SIZE, &i_bytes, NULL ) )
593 /* The read failed... too bad.
594 As in the posix spec the file postition is left
595 unspecified after a failure */
597 i_blocks = i_bytes / DVDCSS_BLOCK_SIZE;
601 i_blocks = _win32_dvdcss_aread( i_fd, p_tmp_buffer, i_blocks_total );
604 return -1; /* idem */
608 /* We just have to copy the content of the temp buffer into the iovecs */
610 i_blocks_total = i_blocks;
611 while( i_blocks_total > 0 )
613 memcpy( p_iovec[i_index].iov_base,
614 &p_tmp_buffer[(i_blocks - i_blocks_total) * DVDCSS_BLOCK_SIZE],
615 p_iovec[i_index].iov_len );
616 /* if we read less blocks than asked, we'll just end up copying
617 garbage, this isn't an issue as we return the number of
618 blocks actually read */
619 i_blocks_total -= ( p_iovec[i_index].iov_len / DVDCSS_BLOCK_SIZE );
626 /*****************************************************************************
627 * _win32_dvdcss_aopen: open dvd drive (load aspi and init w32_aspidev
629 *****************************************************************************/
630 static int _win32_dvdcss_aopen( char c_drive, dvdcss_handle dvdcss )
634 struct w32_aspidev *fd;
635 int i, j, i_hostadapters;
636 long (*lpGetSupport)( void );
637 long (*lpSendCommand)( void* );
639 hASPI = LoadLibrary( "wnaspi32.dll" );
642 _dvdcss_error( dvdcss, "unable to load wnaspi32.dll" );
646 (FARPROC) lpGetSupport = GetProcAddress( hASPI, "GetASPI32SupportInfo" );
647 (FARPROC) lpSendCommand = GetProcAddress( hASPI, "SendASPI32Command" );
649 if(lpGetSupport == NULL || lpSendCommand == NULL )
651 _dvdcss_debug( dvdcss, "unable to get aspi function pointers" );
652 FreeLibrary( hASPI );
656 dwSupportInfo = lpGetSupport();
658 if( HIBYTE( LOWORD ( dwSupportInfo ) ) == SS_NO_ADAPTERS )
660 _dvdcss_debug( dvdcss, "no host adapters found (aspi)" );
661 FreeLibrary( hASPI );
665 if( HIBYTE( LOWORD ( dwSupportInfo ) ) != SS_COMP )
667 _dvdcss_error( dvdcss, "unable to initalize aspi layer" );
668 FreeLibrary( hASPI );
672 i_hostadapters = LOBYTE( LOWORD( dwSupportInfo ) );
673 if( i_hostadapters == 0 )
675 FreeLibrary( hASPI );
679 fd = malloc( sizeof( struct w32_aspidev ) );
682 FreeLibrary( hASPI );
687 fd->hASPI = (long) hASPI;
688 fd->lpSendCommand = lpSendCommand;
690 c_drive = c_drive > 'Z' ? c_drive - 'a' : c_drive - 'A';
692 for( i = 0; i < i_hostadapters; i++ )
694 for( j = 0; j < 15; j++ )
696 struct SRB_GetDiskInfo srbDiskInfo;
698 srbDiskInfo.SRB_Cmd = SC_GET_DISK_INFO;
699 srbDiskInfo.SRB_HaId = i;
700 srbDiskInfo.SRB_Flags = 0;
701 srbDiskInfo.SRB_Hdr_Rsvd = 0;
702 srbDiskInfo.SRB_Target = j;
703 srbDiskInfo.SRB_Lun = 0;
705 lpSendCommand( (void*) &srbDiskInfo );
707 if( (srbDiskInfo.SRB_Status == SS_COMP) &&
708 (srbDiskInfo.SRB_Int13HDriveInfo == c_drive) )
710 fd->i_sid = MAKEWORD( i, j );
717 FreeLibrary( hASPI );
718 _dvdcss_debug( dvdcss, "unable to get haid and target (aspi)" );
722 /*****************************************************************************
723 * _win32_dvdcss_aclose: close dvd drive (unload aspi and free w32_aspidev
725 *****************************************************************************/
726 static int _win32_dvdcss_aclose( int i_fd )
728 struct w32_aspidev *fd = (struct w32_aspidev *) i_fd;
730 FreeLibrary( (HMODULE) fd->hASPI );
731 free( (void*) i_fd );
736 /*****************************************************************************
737 * _win32_dvdcss_aseek: aspi version of _dvdcss_seek
739 * returns the number of blocks read.
740 *****************************************************************************/
741 static int _win32_dvdcss_aseek( int i_fd, int i_blocks, int i_method )
744 char sz_buf[ DVDCSS_BLOCK_SIZE ];
745 struct w32_aspidev *fd = (struct w32_aspidev *) i_fd;
747 i_old_blocks = fd->i_blocks;
748 fd->i_blocks = i_blocks;
750 if( _win32_dvdcss_aread( i_fd, sz_buf, 1 ) == -1 )
752 fd->i_blocks = i_old_blocks;
761 /*****************************************************************************
762 * _win32_dvdcss_aread: aspi version of _dvdcss_read
764 * returns the number of blocks read.
765 *****************************************************************************/
766 static int _win32_dvdcss_aread( int i_fd, void *p_data, int i_blocks )
769 struct SRB_ExecSCSICmd ssc;
770 struct w32_aspidev *fd = (struct w32_aspidev *) i_fd;
772 /* Create the transfer completion event */
773 hEvent = CreateEvent( NULL, TRUE, FALSE, NULL );
779 memset( &ssc, 0, sizeof( ssc ) );
781 ssc.SRB_Cmd = SC_EXEC_SCSI_CMD;
782 ssc.SRB_Flags = SRB_DIR_IN | SRB_EVENT_NOTIFY;
783 ssc.SRB_HaId = LOBYTE( fd->i_sid );
784 ssc.SRB_Target = HIBYTE( fd->i_sid );
785 ssc.SRB_SenseLen = SENSE_LEN;
787 ssc.SRB_PostProc = (LPVOID) hEvent;
788 ssc.SRB_BufPointer = p_data;
791 ssc.CDBByte[0] = 0xA8; /* RAW */
792 ssc.CDBByte[2] = (UCHAR) (fd->i_blocks >> 24);
793 ssc.CDBByte[3] = (UCHAR) (fd->i_blocks >> 16) & 0xff;
794 ssc.CDBByte[4] = (UCHAR) (fd->i_blocks >> 8) & 0xff;
795 ssc.CDBByte[5] = (UCHAR) (fd->i_blocks) & 0xff;
797 /* We have to break down the reads into 64kb pieces (ASPI restriction) */
800 ssc.SRB_BufLen = 32 * DVDCSS_BLOCK_SIZE;
804 /* Initiate transfer */
805 ResetEvent( hEvent );
806 fd->lpSendCommand( (void*) &ssc );
808 /* transfer the next 64kb (_win32_dvdcss_aread is called recursively)
809 * We need to check the status of the read on return */
810 if( _win32_dvdcss_aread( i_fd, p_data + 32 * DVDCSS_BLOCK_SIZE,
818 /* This is the last transfer */
819 ssc.SRB_BufLen = i_blocks * DVDCSS_BLOCK_SIZE;
820 ssc.CDBByte[9] = (UCHAR) i_blocks;
821 fd->i_blocks += i_blocks;
823 /* Initiate transfer */
824 ResetEvent( hEvent );
825 fd->lpSendCommand( (void*) &ssc );
829 /* If the command has still not been processed, wait until it's finished */
830 if( ssc.SRB_Status == SS_PENDING )
832 WaitForSingleObject( hEvent, INFINITE );
834 CloseHandle( hEvent );
836 /* check that the transfer went as planned */
837 if( ssc.SRB_Status != SS_COMP )