git.sesse.net Git - vlc/blob - modules/access/dvd/dvd.c

   1 /*****************************************************************************
   2  * dvd.c : DVD input module for vlc
   3  *****************************************************************************
   4  * Copyright (C) 2000-2001 VideoLAN
   5  * $Id: dvd.c,v 1.5 2003/02/20 01:52:45 sigmunau Exp $
   6  *
   7  * Authors: Samuel Hocevar <sam@zoy.org>
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License as published by
  11  * the Free Software Foundation; either version 2 of the License, or
  12  * (at your option) any later version.
  13  *
  14  * This program is distributed in the hope that it will be useful,
  15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17  * GNU General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU General Public License
  20  * along with this program; if not, write to the Free Software
  21  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111, USA.
  22  *****************************************************************************/
  23
  24 /*****************************************************************************
  25  * Preamble
  26  *****************************************************************************/
  27 #include <stdlib.h>                                      /* malloc(), free() */
  28 #include <string.h>                                              /* strdup() */
  29
  30 #include <vlc/vlc.h>
  31
  32 #ifdef GOD_DAMN_DMCA
  33 #   include <stdio.h>
  34 #   include <fcntl.h>
  35 #   include <unistd.h>
  36 #   include <sys/types.h>
  37 #   include <sys/stat.h>
  38 #   include <sys/uio.h>                                      /* struct iovec */
  39 #   include <sys/ioctl.h>
  40 #   include <dlfcn.h>
  41 #   include <netinet/in.h>
  42 #   include <linux/cdrom.h>
  43
  44 #   include "dvdcss.h"
  45 #endif
  46
  47 /*****************************************************************************
  48  * Local prototypes.
  49  *****************************************************************************/
  50 int  E_(DVDOpen)   ( vlc_object_t * );
  51 void E_(DVDClose)  ( vlc_object_t * );
  52
  53 int  E_(DVDInit)   ( vlc_object_t * );
  54 void E_(DVDEnd)    ( vlc_object_t * );
  55
  56 #ifdef GOD_DAMN_DMCA
  57 static void *p_libdvdcss;
  58 static void ProbeLibDVDCSS  ( void );
  59 static void UnprobeLibDVDCSS( void );
  60 #endif
  61
  62 /*****************************************************************************
  63  * Module descriptor
  64  *****************************************************************************/
  65 #define CSSMETHOD_TEXT N_("method to use by libdvdcss for key decryption")
  66 #define CSSMETHOD_LONGTEXT N_( \
  67     "Set the method used by libdvdcss for key decryption.\n" \
  68     "title: decrypted title key is guessed from the encrypted sectors of " \
  69            "the stream. Thus it should work with a file as well as the " \
  70            "DVD device. But it sometimes takes much time to decrypt a title " \
  71            "key and may even fail. With this method, the key is only checked "\
  72            "at the beginning of each title, so it won't work if the key " \
  73            "changes in the middle of a title.\n" \
  74     "disc: the disc key is first cracked, then all title keys can be " \
  75            "decrypted instantly, which allows us to check them often.\n" \
  76     "key: the same as \"disc\" if you don't have a file with player keys " \
  77            "at compilation time. If you do, the decryption of the disc key " \
  78            "will be faster with this method. It is the one that was used by " \
  79            "libcss.\n" \
  80     "The default method is: key.")
  81
  82 static char *cssmethod_list[] = { "title", "disc", "key", NULL };
  83
  84 vlc_module_begin();
  85     int i;
  86     add_usage_hint( N_("[dvd:][device][@raw_device][@[title][,[chapter][,angle]]]") );
  87     add_category_hint( N_("dvd"), NULL, VLC_TRUE );
  88     add_string_from_list( "dvdcss-method", NULL, cssmethod_list, NULL,
  89                           CSSMETHOD_TEXT, CSSMETHOD_LONGTEXT, VLC_TRUE );
  90 #ifdef GOD_DAMN_DMCA
  91     set_description( _("DVD input module, uses libdvdcss if installed") );
  92     i = 90;
  93 #else
  94     set_description( _("DVD input module, uses libdvdcss") );
  95     i = 100;
  96 #endif
  97     add_shortcut( "dvdold" );
  98     add_submodule();
  99         set_capability( "access", i );
 100         set_callbacks( E_(DVDOpen), E_(DVDClose) );
 101     add_submodule();
 102         set_capability( "demux", 0 );
 103         set_callbacks( E_(DVDInit), E_(DVDEnd) );
 104 #ifdef GOD_DAMN_DMCA
 105     ProbeLibDVDCSS();
 106 #endif
 107 vlc_module_end();
 108
 109 #if 0 /* FIXME */
 110     UnprobeLibDVDCSS();
 111 #endif
 112
 113 /* Following functions are local */
 114
 115 #ifdef GOD_DAMN_DMCA
 116 /*****************************************************************************
 117  * ProbeLibDVDCSS: look for a libdvdcss object.
 118  *****************************************************************************
 119  * This functions looks for libdvdcss, using dlopen(), and fills function
 120  * pointers with what it finds. On failure, uses the dummy libdvdcss
 121  * replacement provided by vlc.
 122  *****************************************************************************/
 123 static void ProbeLibDVDCSS( void )
 124 {
 125     static char *pp_filelist[] = { "libdvdcss.so.2",
 126                                    "./libdvdcss.so.2",
 127                                    "./lib/libdvdcss.so.2",
 128                                    "libdvdcss.so.1",
 129                                    "./libdvdcss.so.1",
 130                                    "./lib/libdvdcss.so.1",
 131                                    NULL };
 132     char **pp_file = pp_filelist;
 133
 134     /* Try to open the dynamic object */
 135     do
 136     {
 137         p_libdvdcss = dlopen( *pp_file, RTLD_LAZY );
 138         if( p_libdvdcss != NULL )
 139         {
 140 //X            intf_WarnMsg( 2, "module: builtin module `dvd' found libdvdcss "
 141 //X                             "in `%s'", *pp_file );
 142             break;
 143         }
 144         pp_file++;
 145
 146     } while( *pp_file != NULL );
 147
 148     /* If libdvdcss.so was found, check that it's valid */
 149     if( p_libdvdcss == NULL )
 150     {
 151 //X        intf_ErrMsg( "dvd warning: libdvdcss.so.2 not present" );
 152     }
 153     else
 154     {
 155         ____dvdcss_open = dlsym( p_libdvdcss, "dvdcss_open" );
 156         ____dvdcss_close = dlsym( p_libdvdcss, "dvdcss_close" );
 157         ____dvdcss_title = dlsym( p_libdvdcss, "dvdcss_title" );
 158         ____dvdcss_seek = dlsym( p_libdvdcss, "dvdcss_seek" );
 159         ____dvdcss_read = dlsym( p_libdvdcss, "dvdcss_read" );
 160         ____dvdcss_readv = dlsym( p_libdvdcss, "dvdcss_readv" );
 161         ____dvdcss_error = dlsym( p_libdvdcss, "dvdcss_error" );
 162
 163         if( ____dvdcss_open == NULL || ____dvdcss_close == NULL
 164              || ____dvdcss_title == NULL || ____dvdcss_seek == NULL
 165              || ____dvdcss_read == NULL || ____dvdcss_readv == NULL
 166              || ____dvdcss_error == NULL )
 167         {
 168 //X            intf_ErrMsg( "dvd warning: missing symbols in libdvdcss.so.2, "
 169 //X                         "this shouldn't happen !" );
 170             dlclose( p_libdvdcss );
 171             p_libdvdcss = NULL;
 172         }
 173     }
 174
 175     /* If libdvdcss was not found or was not valid, use the dummy
 176      * replacement functions. */
 177     if( p_libdvdcss == NULL )
 178     {
 179 //X        intf_ErrMsg( "dvd warning: no valid libdvdcss found, "
 180 //X                     "I will only play unencrypted DVDs" );
 181 //X        intf_ErrMsg( "dvd warning: get libdvdcss at "
 182 //X                     "http://www.videolan.org/libdvdcss/" );
 183
 184         ____dvdcss_open = dummy_dvdcss_open;
 185         ____dvdcss_close = dummy_dvdcss_close;
 186         ____dvdcss_title = dummy_dvdcss_title;
 187         ____dvdcss_seek = dummy_dvdcss_seek;
 188         ____dvdcss_read = dummy_dvdcss_read;
 189         ____dvdcss_readv = dummy_dvdcss_readv;
 190         ____dvdcss_error = dummy_dvdcss_error;
 191     }
 192 }
 193
 194 /*****************************************************************************
 195  * UnprobeLibDVDCSS: free resources allocated by ProbeLibDVDCSS, if any.
 196  *****************************************************************************/
 197 static void UnprobeLibDVDCSS( void )
 198 {
 199     if( p_libdvdcss != NULL )
 200     {
 201         dlclose( p_libdvdcss );
 202         p_libdvdcss = NULL;
 203     }
 204 }
 205
 206 /* Dummy libdvdcss with minimal DVD access. */
 207
 208 /*****************************************************************************
 209  * Local structure
 210  *****************************************************************************/
 211 struct dvdcss_s
 212 {
 213     /* File descriptor */
 214     int i_fd;
 215 };
 216
 217 /*****************************************************************************
 218  * dvdcss_open: initialize library, open a DVD device, crack CSS key
 219  *****************************************************************************/
 220 extern dvdcss_handle dummy_dvdcss_open ( char *psz_target )
 221 {
 222     dvdcss_handle dvdcss;
 223     dvd_struct    dvd;
 224
 225     /* Allocate the library structure */
 226     dvdcss = malloc( sizeof( struct dvdcss_s ) );
 227     if( dvdcss == NULL )
 228     {
 229         fprintf( stderr, "dvd error: "
 230                          "dummy libdvdcss could not allocate memory\n" );
 231         return NULL;
 232     }
 233
 234     /* Open the device */
 235     dvdcss->i_fd = open( psz_target, 0 );
 236     if( dvdcss->i_fd < 0 )
 237     {
 238         fprintf( stderr, "dvd error: "
 239                          "dummy libdvdcss could not open device\n" );
 240         free( dvdcss );
 241         return NULL;
 242     }
 243
 244     /* Check for encryption or ioctl failure */
 245     dvd.type = DVD_STRUCT_COPYRIGHT;
 246     dvd.copyright.layer_num = 0;
 247     if( ioctl( dvdcss->i_fd, DVD_READ_STRUCT, &dvd ) != 0
 248          || dvd.copyright.cpst )
 249     {
 250         fprintf( stderr, "dvd error: "
 251                          "dummy libdvdcss could not decrypt disc\n" );
 252         close( dvdcss->i_fd );
 253         free( dvdcss );
 254         return NULL;
 255     }
 256
 257     return dvdcss;
 258 }
 259
 260 /*****************************************************************************
 261  * dvdcss_error: return the last libdvdcss error message
 262  *****************************************************************************/
 263 extern char * dummy_dvdcss_error ( dvdcss_handle dvdcss )
 264 {
 265     return "generic error";
 266 }
 267
 268 /*****************************************************************************
 269  * dvdcss_seek: seek into the device
 270  *****************************************************************************/
 271 extern int dummy_dvdcss_seek ( dvdcss_handle dvdcss, int i_blocks,
 272                                                      int i_flags )
 273 {
 274     off_t i_read;
 275
 276     i_read = lseek( dvdcss->i_fd,
 277                     (off_t)i_blocks * (off_t)DVDCSS_BLOCK_SIZE, SEEK_SET );
 278
 279     return i_read / DVDCSS_BLOCK_SIZE;
 280 }
 281
 282 /*****************************************************************************
 283  * dvdcss_title: crack the current title key if needed
 284  *****************************************************************************/
 285 extern int dummy_dvdcss_title ( dvdcss_handle dvdcss, int i_block )
 286 {
 287     return 0;
 288 }
 289
 290 /*****************************************************************************
 291  * dvdcss_read: read data from the device, decrypt if requested
 292  *****************************************************************************/
 293 extern int dummy_dvdcss_read ( dvdcss_handle dvdcss, void *p_buffer,
 294                                                      int i_blocks,
 295                                                      int i_flags )
 296 {
 297     int i_bytes;
 298
 299     i_bytes = read( dvdcss->i_fd, p_buffer,
 300                     (size_t)i_blocks * DVDCSS_BLOCK_SIZE );
 301
 302     return i_bytes / DVDCSS_BLOCK_SIZE;
 303 }
 304
 305 /*****************************************************************************
 306  * dvdcss_readv: read data to an iovec structure, decrypt if reaquested
 307  *****************************************************************************/
 308 extern int dummy_dvdcss_readv ( dvdcss_handle dvdcss, void *p_iovec,
 309                                                       int i_blocks,
 310                                                       int i_flags )
 311 {
 312     int i_read;
 313
 314     i_read = readv( dvdcss->i_fd, (struct iovec*)p_iovec, i_blocks );
 315
 316     return i_read / DVDCSS_BLOCK_SIZE;
 317 }
 318
 319 /*****************************************************************************
 320  * dvdcss_close: close the DVD device and clean up the library
 321  *****************************************************************************/
 322 extern int dummy_dvdcss_close ( dvdcss_handle dvdcss )
 323 {
 324     int i_ret;
 325
 326     i_ret = close( dvdcss->i_fd );
 327
 328     if( i_ret < 0 )
 329     {
 330         return i_ret;
 331     }
 332
 333     free( dvdcss );
 334
 335     return 0;
 336 }
 337
 338 #endif
 339