1 /*****************************************************************************
2 * libdvdcss.c: DVD reading library.
3 *****************************************************************************
4 * Copyright (C) 1998-2001 VideoLAN
5 * $Id: libdvdcss.c,v 1.10 2001/07/27 01:05:17 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 /* Check if we've already cracked this key */
167 p_title = dvdcss->p_titles;
168 while( p_title != NULL
169 && p_title->p_next != NULL
170 && p_title->p_next->i_startlb <= i_block )
172 p_title = p_title->p_next;
176 && p_title->i_startlb == i_block )
178 /* We've already cracked this key, nothing to do */
182 /* Crack CSS title key for current VTS */
183 i_ret = CSSGetKey( dvdcss, i_block, p_key );
187 _dvdcss_error( dvdcss, "fatal error in vts css key" );
192 _dvdcss_error( dvdcss, "decryption unavailable" );
196 /* Add key to keytable if it isn't empty */
197 if( p_key[0] | p_key[1] | p_key[2] | p_key[3] | p_key[4] )
199 dvd_title_t *p_newtitle;
201 /* Find our spot in the list */
203 p_title = dvdcss->p_titles;
204 while( p_title != NULL
205 && p_title->i_startlb < i_block )
207 p_newtitle = p_title;
208 p_title = p_title->p_next;
211 /* Save the found title */
212 p_title = p_newtitle;
214 /* Write in the new title and its key */
215 p_newtitle = malloc( sizeof( dvd_title_t ) );
216 p_newtitle->i_startlb = i_block;
217 memcpy( p_newtitle->p_key, p_key, KEY_SIZE );
219 /* Link the new title, either at the beginning or inside the list */
220 if( p_title == NULL )
222 dvdcss->p_titles = p_newtitle;
223 p_newtitle->p_next = NULL;
227 p_newtitle->p_next = p_title->p_next;
228 p_title->p_next = p_newtitle;
235 /*****************************************************************************
236 * dvdcss_read: read data from the device, decrypt if requested
237 *****************************************************************************/
238 extern int dvdcss_read ( dvdcss_handle dvdcss, void *p_buffer,
242 dvd_title_t *p_title;
245 i_ret = _dvdcss_read( dvdcss, p_buffer, i_blocks );
248 || !dvdcss->b_encrypted
249 || !(i_flags & DVDCSS_READ_DECRYPT) )
255 p_title = dvdcss->p_titles;
256 while( p_title != NULL
258 && p_title->p_next->i_startlb < dvdcss->i_seekpos )
260 p_title = p_title->p_next;
263 if( p_title == NULL )
265 /* no css key found to use, so no decryption to do */
269 /* Decrypt the blocks we managed to read */
270 for( i_index = i_ret; i_index; i_index-- )
272 CSSDescrambleSector( p_title->p_key, p_buffer );
273 ((u8*)p_buffer)[0x14] &= 0x8f;
274 (u8*)p_buffer += DVDCSS_BLOCK_SIZE;
280 /*****************************************************************************
281 * dvdcss_readv: read data to an iovec structure, decrypt if reaquested
282 *****************************************************************************/
283 extern int dvdcss_readv ( dvdcss_handle dvdcss, void *p_iovec,
287 #define P_IOVEC ((struct iovec*)p_iovec)
288 dvd_title_t *p_title;
293 i_ret = _dvdcss_readv( dvdcss, P_IOVEC, i_blocks );
296 || !dvdcss->b_encrypted
297 || !(i_flags & DVDCSS_READ_DECRYPT) )
303 p_title = dvdcss->p_titles;
304 while( p_title != NULL
305 && p_title->p_next != NULL
306 && p_title->p_next->i_startlb < dvdcss->i_seekpos )
308 p_title = p_title->p_next;
311 if( p_title == NULL )
313 /* no css key found to use, so no decryption to do */
317 /* Initialize loop for decryption */
318 iov_base = P_IOVEC->iov_base;
319 iov_len = P_IOVEC->iov_len;
321 /* Decrypt the blocks we managed to read */
322 for( i_index = i_ret; i_index; i_index-- )
324 /* Check that iov_len is a multiple of 2048 */
325 if( iov_len & 0x7ff )
330 while( iov_len == 0 )
333 iov_base = P_IOVEC->iov_base;
334 iov_len = P_IOVEC->iov_len;
337 CSSDescrambleSector( p_title->p_key, iov_base );
338 ((u8*)iov_base)[0x14] &= 0x8f;
340 (u8*)iov_base += DVDCSS_BLOCK_SIZE;
341 (u8*)iov_len -= DVDCSS_BLOCK_SIZE;
348 /*****************************************************************************
349 * dvdcss_close: close the DVD device and clean up the library
350 *****************************************************************************/
351 extern int dvdcss_close ( dvdcss_handle dvdcss )
353 dvd_title_t *p_title;
356 /* Free our list of keys */
357 p_title = dvdcss->p_titles;
360 dvd_title_t *p_tmptitle = p_title->p_next;
362 p_title = p_tmptitle;
365 i_ret = _dvdcss_close( dvdcss );
377 /* Following functions are local */
379 static int _dvdcss_open ( dvdcss_handle dvdcss, char *psz_target )
385 _snprintf( psz_dvd, 7, "\\\\.\\%c:", psz_target[0] );
386 (HANDLE) dvdcss->i_fd =
387 CreateFile( psz_dvd, GENERIC_READ | GENERIC_WRITE,
388 FILE_SHARE_READ | FILE_SHARE_WRITE,
389 NULL, OPEN_EXISTING, 0, NULL );
390 if( (HANDLE) dvdcss->i_fd == INVALID_HANDLE_VALUE )
392 _dvdcss_error( dvdcss, "failed opening device" );
398 dvdcss->i_fd = _win32_dvdcss_aopen( psz_target[0], dvdcss );
399 if( dvdcss->i_fd == -1 )
401 _dvdcss_error( dvdcss, "failed opening device" );
406 /* initialise readv temporary buffer */
407 dvdcss->p_readv_buffer = NULL;
408 dvdcss->i_readv_buf_size = 0;
411 dvdcss->i_fd = open( psz_target, 0 );
413 if( dvdcss->i_fd == -1 )
415 _dvdcss_error( dvdcss, "failed opening device" );
424 static int _dvdcss_close ( dvdcss_handle dvdcss )
429 CloseHandle( (HANDLE) dvdcss->i_fd );
433 _win32_dvdcss_aclose( dvdcss->i_fd );
436 /* Free readv temporary buffer */
437 if( dvdcss->p_readv_buffer )
439 free( dvdcss->p_readv_buffer );
440 dvdcss->p_readv_buffer = NULL;
441 dvdcss->i_readv_buf_size = 0;
445 close( dvdcss->i_fd );
452 static int _dvdcss_seek ( dvdcss_handle dvdcss, int i_blocks )
457 LARGE_INTEGER li_read;
459 #ifndef INVALID_SET_FILE_POINTER
460 #define INVALID_SET_FILE_POINTER ((DWORD)-1)
463 li_read.QuadPart = (LONGLONG)i_blocks * DVDCSS_BLOCK_SIZE;
465 li_read.LowPart = SetFilePointer( (HANDLE) dvdcss->i_fd,
467 &li_read.HighPart, FILE_BEGIN );
468 if( (li_read.LowPart == INVALID_SET_FILE_POINTER)
469 && GetLastError() != NO_ERROR)
471 li_read.QuadPart = -DVDCSS_BLOCK_SIZE;
474 li_read.QuadPart /= DVDCSS_BLOCK_SIZE;
475 return (int)li_read.QuadPart;
479 return ( _win32_dvdcss_aseek( dvdcss->i_fd, i_blocks, SEEK_SET ) );
484 dvdcss->i_seekpos = i_blocks;
486 i_read = lseek( dvdcss->i_fd,
487 (off_t)i_blocks * (off_t)DVDCSS_BLOCK_SIZE, SEEK_SET );
489 return i_read / DVDCSS_BLOCK_SIZE;
494 static int _dvdcss_read ( dvdcss_handle dvdcss, void *p_buffer, int i_blocks )
501 if( !ReadFile( (HANDLE) dvdcss->i_fd, p_buffer,
502 i_blocks * DVDCSS_BLOCK_SIZE,
503 (LPDWORD)&i_bytes, NULL ) )
507 return i_bytes / DVDCSS_BLOCK_SIZE;
511 return _win32_dvdcss_aread( dvdcss->i_fd, p_buffer, i_blocks );
517 i_bytes = read( dvdcss->i_fd, p_buffer,
518 (size_t)i_blocks * DVDCSS_BLOCK_SIZE );
519 return i_bytes / DVDCSS_BLOCK_SIZE;
524 static int _dvdcss_readv ( dvdcss_handle dvdcss, struct iovec *p_iovec,
530 /* Check the size of the readv temp buffer, just in case we need to
531 * realloc something bigger */
532 if( dvdcss->i_readv_buf_size < i_blocks * DVDCSS_BLOCK_SIZE )
534 dvdcss->i_readv_buf_size = i_blocks * DVDCSS_BLOCK_SIZE;
536 if( dvdcss->p_readv_buffer ) free( dvdcss->p_readv_buffer );
538 /* Allocate a buffer which will be used as a temporary storage
540 dvdcss->p_readv_buffer = malloc( dvdcss->i_readv_buf_size );
541 if( !dvdcss->p_readv_buffer )
543 _dvdcss_error( dvdcss, " failed (readv)" );
548 i_read = _win32_dvdcss_readv( dvdcss->i_fd, p_iovec, i_blocks,
549 dvdcss->p_readv_buffer );
553 i_read = readv( dvdcss->i_fd, p_iovec, i_blocks );
554 return i_read / DVDCSS_BLOCK_SIZE;
562 /*****************************************************************************
563 * _win32_dvdcss_readv: vectored read using ReadFile for Win2K and
564 * _win32_dvdcss_aread for win9x
565 *****************************************************************************/
566 static int _win32_dvdcss_readv( int i_fd, struct iovec *p_iovec,
567 int i_num_buffers, char *p_tmp_buffer )
570 int i_blocks, i_blocks_total = 0;
572 for( i_index = i_num_buffers; i_index; i_index-- )
574 i_blocks_total += p_iovec[i_index-1].iov_len;
577 if( i_blocks_total <= 0 ) return 0;
579 i_blocks_total /= DVDCSS_BLOCK_SIZE;
583 unsigned long int i_bytes;
584 if( !ReadFile( (HANDLE)i_fd, p_tmp_buffer,
585 i_blocks_total * DVDCSS_BLOCK_SIZE, &i_bytes, NULL ) )
588 /* The read failed... too bad.
589 As in the posix spec the file postition is left
590 unspecified after a failure */
592 i_blocks = i_bytes / DVDCSS_BLOCK_SIZE;
596 i_blocks = _win32_dvdcss_aread( i_fd, p_tmp_buffer, i_blocks_total );
599 return -1; /* idem */
603 /* We just have to copy the content of the temp buffer into the iovecs */
605 i_blocks_total = i_blocks;
606 while( i_blocks_total > 0 )
608 memcpy( p_iovec[i_index].iov_base,
609 &p_tmp_buffer[(i_blocks - i_blocks_total) * DVDCSS_BLOCK_SIZE],
610 p_iovec[i_index].iov_len );
611 /* if we read less blocks than asked, we'll just end up copying
612 garbage, this isn't an issue as we return the number of
613 blocks actually read */
614 i_blocks_total -= ( p_iovec[i_index].iov_len / DVDCSS_BLOCK_SIZE );
621 /*****************************************************************************
622 * _win32_dvdcss_aopen: open dvd drive (load aspi and init w32_aspidev
624 *****************************************************************************/
625 static int _win32_dvdcss_aopen( char c_drive, dvdcss_handle dvdcss )
629 struct w32_aspidev *fd;
630 int i, j, i_hostadapters;
631 long (*lpGetSupport)( void );
632 long (*lpSendCommand)( void* );
634 hASPI = LoadLibrary( "wnaspi32.dll" );
637 _dvdcss_error( dvdcss, "unable to load wnaspi32.dll" );
641 (FARPROC) lpGetSupport = GetProcAddress( hASPI, "GetASPI32SupportInfo" );
642 (FARPROC) lpSendCommand = GetProcAddress( hASPI, "SendASPI32Command" );
644 if(lpGetSupport == NULL || lpSendCommand == NULL )
646 _dvdcss_debug( dvdcss, "unable to get aspi function pointers" );
647 FreeLibrary( hASPI );
651 dwSupportInfo = lpGetSupport();
653 if( HIBYTE( LOWORD ( dwSupportInfo ) ) == SS_NO_ADAPTERS )
655 _dvdcss_debug( dvdcss, "no host adapters found (aspi)" );
656 FreeLibrary( hASPI );
660 if( HIBYTE( LOWORD ( dwSupportInfo ) ) != SS_COMP )
662 _dvdcss_error( dvdcss, "unable to initalize aspi layer" );
663 FreeLibrary( hASPI );
667 i_hostadapters = LOBYTE( LOWORD( dwSupportInfo ) );
668 if( i_hostadapters == 0 )
670 FreeLibrary( hASPI );
674 fd = malloc( sizeof( struct w32_aspidev ) );
677 FreeLibrary( hASPI );
682 fd->hASPI = (long) hASPI;
683 fd->lpSendCommand = lpSendCommand;
685 c_drive = c_drive > 'Z' ? c_drive - 'a' : c_drive - 'A';
687 for( i = 0; i < i_hostadapters; i++ )
689 for( j = 0; j < 15; j++ )
691 struct SRB_GetDiskInfo srbDiskInfo;
693 srbDiskInfo.SRB_Cmd = SC_GET_DISK_INFO;
694 srbDiskInfo.SRB_HaId = i;
695 srbDiskInfo.SRB_Flags = 0;
696 srbDiskInfo.SRB_Hdr_Rsvd = 0;
697 srbDiskInfo.SRB_Target = j;
698 srbDiskInfo.SRB_Lun = 0;
700 lpSendCommand( (void*) &srbDiskInfo );
702 if( (srbDiskInfo.SRB_Status == SS_COMP) &&
703 (srbDiskInfo.SRB_Int13HDriveInfo == c_drive) )
705 fd->i_sid = MAKEWORD( i, j );
712 FreeLibrary( hASPI );
713 _dvdcss_debug( dvdcss, "unable to get haid and target (aspi)" );
717 /*****************************************************************************
718 * _win32_dvdcss_aclose: close dvd drive (unload aspi and free w32_aspidev
720 *****************************************************************************/
721 static int _win32_dvdcss_aclose( int i_fd )
723 struct w32_aspidev *fd = (struct w32_aspidev *) i_fd;
725 FreeLibrary( (HMODULE) fd->hASPI );
726 free( (void*) i_fd );
731 /*****************************************************************************
732 * _win32_dvdcss_aseek: aspi version of _dvdcss_seek
734 * returns the number of blocks read.
735 *****************************************************************************/
736 static int _win32_dvdcss_aseek( int i_fd, int i_blocks, int i_method )
739 char sz_buf[ DVDCSS_BLOCK_SIZE ];
740 struct w32_aspidev *fd = (struct w32_aspidev *) i_fd;
742 i_old_blocks = fd->i_blocks;
743 fd->i_blocks = i_blocks;
745 if( _win32_dvdcss_aread( i_fd, sz_buf, 1 ) == -1 )
747 fd->i_blocks = i_old_blocks;
756 /*****************************************************************************
757 * _win32_dvdcss_aread: aspi version of _dvdcss_read
759 * returns the number of blocks read.
760 *****************************************************************************/
761 static int _win32_dvdcss_aread( int i_fd, void *p_data, int i_blocks )
764 struct SRB_ExecSCSICmd ssc;
765 struct w32_aspidev *fd = (struct w32_aspidev *) i_fd;
767 /* Create the transfer completion event */
768 hEvent = CreateEvent( NULL, TRUE, FALSE, NULL );
774 memset( &ssc, 0, sizeof( ssc ) );
776 ssc.SRB_Cmd = SC_EXEC_SCSI_CMD;
777 ssc.SRB_Flags = SRB_DIR_IN | SRB_EVENT_NOTIFY;
778 ssc.SRB_HaId = LOBYTE( fd->i_sid );
779 ssc.SRB_Target = HIBYTE( fd->i_sid );
780 ssc.SRB_SenseLen = SENSE_LEN;
782 ssc.SRB_PostProc = (LPVOID) hEvent;
783 ssc.SRB_BufPointer = p_data;
786 ssc.CDBByte[0] = 0xA8; /* RAW */
787 ssc.CDBByte[2] = (UCHAR) (fd->i_blocks >> 24);
788 ssc.CDBByte[3] = (UCHAR) (fd->i_blocks >> 16) & 0xff;
789 ssc.CDBByte[4] = (UCHAR) (fd->i_blocks >> 8) & 0xff;
790 ssc.CDBByte[5] = (UCHAR) (fd->i_blocks) & 0xff;
792 /* We have to break down the reads into 64kb pieces (ASPI restriction) */
795 ssc.SRB_BufLen = 32 * DVDCSS_BLOCK_SIZE;
799 /* Initiate transfer */
800 ResetEvent( hEvent );
801 fd->lpSendCommand( (void*) &ssc );
803 /* transfer the next 64kb (_win32_dvdcss_aread is called recursively)
804 * We need to check the status of the read on return */
805 if( _win32_dvdcss_aread( i_fd, p_data + 32 * DVDCSS_BLOCK_SIZE,
813 /* This is the last transfer */
814 ssc.SRB_BufLen = i_blocks * DVDCSS_BLOCK_SIZE;
815 ssc.CDBByte[9] = (UCHAR) i_blocks;
816 fd->i_blocks += i_blocks;
818 /* Initiate transfer */
819 ResetEvent( hEvent );
820 fd->lpSendCommand( (void*) &ssc );
824 /* If the command has still not been processed, wait until it's finished */
825 if( ssc.SRB_Status == SS_PENDING )
827 WaitForSingleObject( hEvent, INFINITE );
829 CloseHandle( hEvent );
831 /* check that the transfer went as planned */
832 if( ssc.SRB_Status != SS_COMP )