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 1.10 2004/01/25 17:31:22 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 used by libdvdcss for 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
 102     add_shortcut( "dvdold" );
 103     add_shortcut( "dvdsimple" );
 104     set_capability( "access", i );
 105     set_callbacks( E_(DVDOpen), E_(DVDClose) );
 106
 107     add_submodule();
 108         set_capability( "demux", 0 );
 109         set_callbacks( E_(DVDInit), E_(DVDEnd) );
 110 #ifdef GOD_DAMN_DMCA
 111     ProbeLibDVDCSS();
 112 #endif
 113 vlc_module_end();
 114
 115 #if 0 /* FIXME */
 116     UnprobeLibDVDCSS();
 117 #endif
 118
 119 /* Following functions are local */
 120
 121 #ifdef GOD_DAMN_DMCA
 122 /*****************************************************************************
 123  * ProbeLibDVDCSS: look for a libdvdcss object.
 124  *****************************************************************************
 125  * This functions looks for libdvdcss, using dlopen(), and fills function
 126  * pointers with what it finds. On failure, uses the dummy libdvdcss
 127  * replacement provided by vlc.
 128  *****************************************************************************/
 129 static void ProbeLibDVDCSS( void )
 130 {
 131     static char *pp_filelist[] = { "libdvdcss.so.2",
 132                                    "./libdvdcss.so.2",
 133                                    "./lib/libdvdcss.so.2",
 134                                    "libdvdcss.so.1",
 135                                    "./libdvdcss.so.1",
 136                                    "./lib/libdvdcss.so.1",
 137                                    NULL };
 138     char **pp_file = pp_filelist;
 139
 140     /* Try to open the dynamic object */
 141     do
 142     {
 143         p_libdvdcss = dlopen( *pp_file, RTLD_LAZY );
 144         if( p_libdvdcss != NULL )
 145         {
 146 //X            intf_WarnMsg( 2, "module: builtin module `dvd' found libdvdcss "
 147 //X                             "in `%s'", *pp_file );
 148             break;
 149         }
 150         pp_file++;
 151
 152     } while( *pp_file != NULL );
 153
 154     /* If libdvdcss.so was found, check that it's valid */
 155     if( p_libdvdcss == NULL )
 156     {
 157 //X        intf_ErrMsg( "dvd warning: libdvdcss.so.2 not present" );
 158     }
 159     else
 160     {
 161         ____dvdcss_open = dlsym( p_libdvdcss, "dvdcss_open" );
 162         ____dvdcss_close = dlsym( p_libdvdcss, "dvdcss_close" );
 163         ____dvdcss_title = dlsym( p_libdvdcss, "dvdcss_title" );
 164         ____dvdcss_seek = dlsym( p_libdvdcss, "dvdcss_seek" );
 165         ____dvdcss_read = dlsym( p_libdvdcss, "dvdcss_read" );
 166         ____dvdcss_readv = dlsym( p_libdvdcss, "dvdcss_readv" );
 167         ____dvdcss_error = dlsym( p_libdvdcss, "dvdcss_error" );
 168
 169         if( ____dvdcss_open == NULL || ____dvdcss_close == NULL
 170              || ____dvdcss_title == NULL || ____dvdcss_seek == NULL
 171              || ____dvdcss_read == NULL || ____dvdcss_readv == NULL
 172              || ____dvdcss_error == NULL )
 173         {
 174 //X            intf_ErrMsg( "dvd warning: missing symbols in libdvdcss.so.2, "
 175 //X                         "this shouldn't happen !" );
 176             dlclose( p_libdvdcss );
 177             p_libdvdcss = NULL;
 178         }
 179     }
 180
 181     /* If libdvdcss was not found or was not valid, use the dummy
 182      * replacement functions. */
 183     if( p_libdvdcss == NULL )
 184     {
 185 //X        intf_ErrMsg( "dvd warning: no valid libdvdcss found, "
 186 //X                     "I will only play unencrypted DVDs" );
 187 //X        intf_ErrMsg( "dvd warning: get libdvdcss at "
 188 //X                     "http://www.videolan.org/libdvdcss/" );
 189
 190         ____dvdcss_open = dummy_dvdcss_open;
 191         ____dvdcss_close = dummy_dvdcss_close;
 192         ____dvdcss_title = dummy_dvdcss_title;
 193         ____dvdcss_seek = dummy_dvdcss_seek;
 194         ____dvdcss_read = dummy_dvdcss_read;
 195         ____dvdcss_readv = dummy_dvdcss_readv;
 196         ____dvdcss_error = dummy_dvdcss_error;
 197     }
 198 }
 199
 200 /*****************************************************************************
 201  * UnprobeLibDVDCSS: free resources allocated by ProbeLibDVDCSS, if any.
 202  *****************************************************************************/
 203 static void UnprobeLibDVDCSS( void )
 204 {
 205     if( p_libdvdcss != NULL )
 206     {
 207         dlclose( p_libdvdcss );
 208         p_libdvdcss = NULL;
 209     }
 210 }
 211
 212 /* Dummy libdvdcss with minimal DVD access. */
 213
 214 /*****************************************************************************
 215  * Local structure
 216  *****************************************************************************/
 217 struct dvdcss_s
 218 {
 219     /* File descriptor */
 220     int i_fd;
 221 };
 222
 223 /*****************************************************************************
 224  * dvdcss_open: initialize library, open a DVD device, crack CSS key
 225  *****************************************************************************/
 226 extern dvdcss_handle dummy_dvdcss_open ( char *psz_target )
 227 {
 228     dvdcss_handle dvdcss;
 229     dvd_struct    dvd;
 230
 231     /* Allocate the library structure */
 232     dvdcss = malloc( sizeof( struct dvdcss_s ) );
 233     if( dvdcss == NULL )
 234     {
 235         fprintf( stderr, "dvd error: "
 236                          "dummy libdvdcss could not allocate memory\n" );
 237         return NULL;
 238     }
 239
 240     /* Open the device */
 241     dvdcss->i_fd = open( psz_target, 0 );
 242     if( dvdcss->i_fd < 0 )
 243     {
 244         fprintf( stderr, "dvd error: "
 245                          "dummy libdvdcss could not open device\n" );
 246         free( dvdcss );
 247         return NULL;
 248     }
 249
 250     /* Check for encryption or ioctl failure */
 251     dvd.type = DVD_STRUCT_COPYRIGHT;
 252     dvd.copyright.layer_num = 0;
 253     if( ioctl( dvdcss->i_fd, DVD_READ_STRUCT, &dvd ) != 0
 254          || dvd.copyright.cpst )
 255     {
 256         fprintf( stderr, "dvd error: "
 257                          "dummy libdvdcss could not decrypt disc\n" );
 258         close( dvdcss->i_fd );
 259         free( dvdcss );
 260         return NULL;
 261     }
 262
 263     return dvdcss;
 264 }
 265
 266 /*****************************************************************************
 267  * dvdcss_error: return the last libdvdcss error message
 268  *****************************************************************************/
 269 extern char * dummy_dvdcss_error ( dvdcss_handle dvdcss )
 270 {
 271     return "generic error";
 272 }
 273
 274 /*****************************************************************************
 275  * dvdcss_seek: seek into the device
 276  *****************************************************************************/
 277 extern int dummy_dvdcss_seek ( dvdcss_handle dvdcss, int i_blocks,
 278                                                      int i_flags )
 279 {
 280     off_t i_read;
 281
 282     i_read = lseek( dvdcss->i_fd,
 283                     (off_t)i_blocks * (off_t)DVDCSS_BLOCK_SIZE, SEEK_SET );
 284
 285     return i_read / DVDCSS_BLOCK_SIZE;
 286 }
 287
 288 /*****************************************************************************
 289  * dvdcss_title: crack the current title key if needed
 290  *****************************************************************************/
 291 extern int dummy_dvdcss_title ( dvdcss_handle dvdcss, int i_block )
 292 {
 293     return 0;
 294 }
 295
 296 /*****************************************************************************
 297  * dvdcss_read: read data from the device, decrypt if requested
 298  *****************************************************************************/
 299 extern int dummy_dvdcss_read ( dvdcss_handle dvdcss, void *p_buffer,
 300                                                      int i_blocks,
 301                                                      int i_flags )
 302 {
 303     int i_bytes;
 304
 305     i_bytes = read( dvdcss->i_fd, p_buffer,
 306                     (size_t)i_blocks * DVDCSS_BLOCK_SIZE );
 307
 308     return i_bytes / DVDCSS_BLOCK_SIZE;
 309 }
 310
 311 /*****************************************************************************
 312  * dvdcss_readv: read data to an iovec structure, decrypt if reaquested
 313  *****************************************************************************/
 314 extern int dummy_dvdcss_readv ( dvdcss_handle dvdcss, void *p_iovec,
 315                                                       int i_blocks,
 316                                                       int i_flags )
 317 {
 318     int i_read;
 319
 320     i_read = readv( dvdcss->i_fd, (struct iovec*)p_iovec, i_blocks );
 321
 322     return i_read / DVDCSS_BLOCK_SIZE;
 323 }
 324
 325 /*****************************************************************************
 326  * dvdcss_close: close the DVD device and clean up the library
 327  *****************************************************************************/
 328 extern int dummy_dvdcss_close ( dvdcss_handle dvdcss )
 329 {
 330     int i_ret;
 331
 332     i_ret = close( dvdcss->i_fd );
 333
 334     if( i_ret < 0 )
 335     {
 336         return i_ret;
 337     }
 338
 339     free( dvdcss );
 340
 341     return 0;
 342 }
 343
 344 #endif
 345