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 1.9 2003/11/05 00:39:16 gbazin 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 *psz_css_list[] = { "title", "disc", "key" };
  83 static char *psz_css_list_text[] = { N_("title"), N_("Disc"), N_("Key") };
  84
  85 vlc_module_begin();
  86     int i;
  87     add_usage_hint( N_("[dvd:][device][@raw_device][@[title][,[chapter][,angle]]]") );
  88     add_category_hint( N_("dvd"), NULL, VLC_TRUE );
  89
  90     add_string( "dvdcss-method", NULL, NULL, CSSMETHOD_TEXT,
  91                 CSSMETHOD_LONGTEXT, VLC_TRUE );
  92         change_string_list( psz_css_list, psz_css_list_text, 0 );
  93
  94 #ifdef GOD_DAMN_DMCA
  95     set_description( _("DVD input (uses libdvdcss if installed)") );
  96     i = 90;
  97 #else
  98     set_description( _("DVD input (uses libdvdcss)") );
  99     i = 100;
 100 #endif
 101     add_shortcut( "dvdold" );
 102     add_shortcut( "dvdsimple" );
 103     set_capability( "access", i );
 104     set_callbacks( E_(DVDOpen), E_(DVDClose) );
 105
 106     add_submodule();
 107         set_capability( "demux", 0 );
 108         set_callbacks( E_(DVDInit), E_(DVDEnd) );
 109 #ifdef GOD_DAMN_DMCA
 110     ProbeLibDVDCSS();
 111 #endif
 112 vlc_module_end();
 113
 114 #if 0 /* FIXME */
 115     UnprobeLibDVDCSS();
 116 #endif
 117
 118 /* Following functions are local */
 119
 120 #ifdef GOD_DAMN_DMCA
 121 /*****************************************************************************
 122  * ProbeLibDVDCSS: look for a libdvdcss object.
 123  *****************************************************************************
 124  * This functions looks for libdvdcss, using dlopen(), and fills function
 125  * pointers with what it finds. On failure, uses the dummy libdvdcss
 126  * replacement provided by vlc.
 127  *****************************************************************************/
 128 static void ProbeLibDVDCSS( void )
 129 {
 130     static char *pp_filelist[] = { "libdvdcss.so.2",
 131                                    "./libdvdcss.so.2",
 132                                    "./lib/libdvdcss.so.2",
 133                                    "libdvdcss.so.1",
 134                                    "./libdvdcss.so.1",
 135                                    "./lib/libdvdcss.so.1",
 136                                    NULL };
 137     char **pp_file = pp_filelist;
 138
 139     /* Try to open the dynamic object */
 140     do
 141     {
 142         p_libdvdcss = dlopen( *pp_file, RTLD_LAZY );
 143         if( p_libdvdcss != NULL )
 144         {
 145 //X            intf_WarnMsg( 2, "module: builtin module `dvd' found libdvdcss "
 146 //X                             "in `%s'", *pp_file );
 147             break;
 148         }
 149         pp_file++;
 150
 151     } while( *pp_file != NULL );
 152
 153     /* If libdvdcss.so was found, check that it's valid */
 154     if( p_libdvdcss == NULL )
 155     {
 156 //X        intf_ErrMsg( "dvd warning: libdvdcss.so.2 not present" );
 157     }
 158     else
 159     {
 160         ____dvdcss_open = dlsym( p_libdvdcss, "dvdcss_open" );
 161         ____dvdcss_close = dlsym( p_libdvdcss, "dvdcss_close" );
 162         ____dvdcss_title = dlsym( p_libdvdcss, "dvdcss_title" );
 163         ____dvdcss_seek = dlsym( p_libdvdcss, "dvdcss_seek" );
 164         ____dvdcss_read = dlsym( p_libdvdcss, "dvdcss_read" );
 165         ____dvdcss_readv = dlsym( p_libdvdcss, "dvdcss_readv" );
 166         ____dvdcss_error = dlsym( p_libdvdcss, "dvdcss_error" );
 167
 168         if( ____dvdcss_open == NULL || ____dvdcss_close == NULL
 169              || ____dvdcss_title == NULL || ____dvdcss_seek == NULL
 170              || ____dvdcss_read == NULL || ____dvdcss_readv == NULL
 171              || ____dvdcss_error == NULL )
 172         {
 173 //X            intf_ErrMsg( "dvd warning: missing symbols in libdvdcss.so.2, "
 174 //X                         "this shouldn't happen !" );
 175             dlclose( p_libdvdcss );
 176             p_libdvdcss = NULL;
 177         }
 178     }
 179
 180     /* If libdvdcss was not found or was not valid, use the dummy
 181      * replacement functions. */
 182     if( p_libdvdcss == NULL )
 183     {
 184 //X        intf_ErrMsg( "dvd warning: no valid libdvdcss found, "
 185 //X                     "I will only play unencrypted DVDs" );
 186 //X        intf_ErrMsg( "dvd warning: get libdvdcss at "
 187 //X                     "http://www.videolan.org/libdvdcss/" );
 188
 189         ____dvdcss_open = dummy_dvdcss_open;
 190         ____dvdcss_close = dummy_dvdcss_close;
 191         ____dvdcss_title = dummy_dvdcss_title;
 192         ____dvdcss_seek = dummy_dvdcss_seek;
 193         ____dvdcss_read = dummy_dvdcss_read;
 194         ____dvdcss_readv = dummy_dvdcss_readv;
 195         ____dvdcss_error = dummy_dvdcss_error;
 196     }
 197 }
 198
 199 /*****************************************************************************
 200  * UnprobeLibDVDCSS: free resources allocated by ProbeLibDVDCSS, if any.
 201  *****************************************************************************/
 202 static void UnprobeLibDVDCSS( void )
 203 {
 204     if( p_libdvdcss != NULL )
 205     {
 206         dlclose( p_libdvdcss );
 207         p_libdvdcss = NULL;
 208     }
 209 }
 210
 211 /* Dummy libdvdcss with minimal DVD access. */
 212
 213 /*****************************************************************************
 214  * Local structure
 215  *****************************************************************************/
 216 struct dvdcss_s
 217 {
 218     /* File descriptor */
 219     int i_fd;
 220 };
 221
 222 /*****************************************************************************
 223  * dvdcss_open: initialize library, open a DVD device, crack CSS key
 224  *****************************************************************************/
 225 extern dvdcss_handle dummy_dvdcss_open ( char *psz_target )
 226 {
 227     dvdcss_handle dvdcss;
 228     dvd_struct    dvd;
 229
 230     /* Allocate the library structure */
 231     dvdcss = malloc( sizeof( struct dvdcss_s ) );
 232     if( dvdcss == NULL )
 233     {
 234         fprintf( stderr, "dvd error: "
 235                          "dummy libdvdcss could not allocate memory\n" );
 236         return NULL;
 237     }
 238
 239     /* Open the device */
 240     dvdcss->i_fd = open( psz_target, 0 );
 241     if( dvdcss->i_fd < 0 )
 242     {
 243         fprintf( stderr, "dvd error: "
 244                          "dummy libdvdcss could not open device\n" );
 245         free( dvdcss );
 246         return NULL;
 247     }
 248
 249     /* Check for encryption or ioctl failure */
 250     dvd.type = DVD_STRUCT_COPYRIGHT;
 251     dvd.copyright.layer_num = 0;
 252     if( ioctl( dvdcss->i_fd, DVD_READ_STRUCT, &dvd ) != 0
 253          || dvd.copyright.cpst )
 254     {
 255         fprintf( stderr, "dvd error: "
 256                          "dummy libdvdcss could not decrypt disc\n" );
 257         close( dvdcss->i_fd );
 258         free( dvdcss );
 259         return NULL;
 260     }
 261
 262     return dvdcss;
 263 }
 264
 265 /*****************************************************************************
 266  * dvdcss_error: return the last libdvdcss error message
 267  *****************************************************************************/
 268 extern char * dummy_dvdcss_error ( dvdcss_handle dvdcss )
 269 {
 270     return "generic error";
 271 }
 272
 273 /*****************************************************************************
 274  * dvdcss_seek: seek into the device
 275  *****************************************************************************/
 276 extern int dummy_dvdcss_seek ( dvdcss_handle dvdcss, int i_blocks,
 277                                                      int i_flags )
 278 {
 279     off_t i_read;
 280
 281     i_read = lseek( dvdcss->i_fd,
 282                     (off_t)i_blocks * (off_t)DVDCSS_BLOCK_SIZE, SEEK_SET );
 283
 284     return i_read / DVDCSS_BLOCK_SIZE;
 285 }
 286
 287 /*****************************************************************************
 288  * dvdcss_title: crack the current title key if needed
 289  *****************************************************************************/
 290 extern int dummy_dvdcss_title ( dvdcss_handle dvdcss, int i_block )
 291 {
 292     return 0;
 293 }
 294
 295 /*****************************************************************************
 296  * dvdcss_read: read data from the device, decrypt if requested
 297  *****************************************************************************/
 298 extern int dummy_dvdcss_read ( dvdcss_handle dvdcss, void *p_buffer,
 299                                                      int i_blocks,
 300                                                      int i_flags )
 301 {
 302     int i_bytes;
 303
 304     i_bytes = read( dvdcss->i_fd, p_buffer,
 305                     (size_t)i_blocks * DVDCSS_BLOCK_SIZE );
 306
 307     return i_bytes / DVDCSS_BLOCK_SIZE;
 308 }
 309
 310 /*****************************************************************************
 311  * dvdcss_readv: read data to an iovec structure, decrypt if reaquested
 312  *****************************************************************************/
 313 extern int dummy_dvdcss_readv ( dvdcss_handle dvdcss, void *p_iovec,
 314                                                       int i_blocks,
 315                                                       int i_flags )
 316 {
 317     int i_read;
 318
 319     i_read = readv( dvdcss->i_fd, (struct iovec*)p_iovec, i_blocks );
 320
 321     return i_read / DVDCSS_BLOCK_SIZE;
 322 }
 323
 324 /*****************************************************************************
 325  * dvdcss_close: close the DVD device and clean up the library
 326  *****************************************************************************/
 327 extern int dummy_dvdcss_close ( dvdcss_handle dvdcss )
 328 {
 329     int i_ret;
 330
 331     i_ret = close( dvdcss->i_fd );
 332
 333     if( i_ret < 0 )
 334     {
 335         return i_ret;
 336     }
 337
 338     free( dvdcss );
 339
 340     return 0;
 341 }
 342
 343 #endif
 344