git.sesse.net Git - vlc/blob - plugins/dvd/dvd.c

   1 /*****************************************************************************
   2  * dvd.c : DVD input module for vlc
   3  *****************************************************************************
   4  * Copyright (C) 2000-2001 VideoLAN
   5  * $Id: dvd.c,v 1.35 2002/08/01 12:58:38 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 "dummy_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
  55 #ifdef GOD_DAMN_DMCA
  56 static void *p_libdvdcss;
  57 static void ProbeLibDVDCSS  ( void );
  58 static void UnprobeLibDVDCSS( void );
  59 #endif
  60
  61 /*****************************************************************************
  62  * Module descriptor
  63  *****************************************************************************/
  64 #define CSSMETHOD_TEXT N_("Method to use by libdvdcss for key decryption")
  65 #define CSSMETHOD_LONGTEXT N_( \
  66     "title: decrypted title key is guessed from the encrypted sectors of " \
  67            "the stream. Thus it should work with a file as well as the " \
  68            "DVD device. But it sometimes takes much time to decrypt a title " \
  69            "key and may even fail. With this method, the key is only checked "\
  70            "at the beginning of each title, so it won't work if the key " \
  71            "changes in the middle of a title.\n" \
  72     "disc: the disc key is first cracked, then all title keys can be " \
  73            "decrypted instantly, which allows us to check them often.\n" \
  74     "key: the same as \"disc\" if you don't have a file with player keys " \
  75            "at compilation time. If you do, the decryption of the disc key " \
  76            "will be faster with this method. It is the one that was used by " \
  77            "libcss.\n" \
  78     "The default method is: key.")
  79
  80 static char *cssmethod_list[] = { "title", "disc", "key", NULL };
  81
  82 vlc_module_begin();
  83     int i;
  84     add_category_hint( N_("[dvd:][device][@raw_device][@[title][,[chapter][,angle]]]"), NULL );
  85     add_string_from_list( "dvd-css-method", NULL, cssmethod_list, NULL,
  86                           CSSMETHOD_TEXT, CSSMETHOD_LONGTEXT );
  87 #ifdef GOD_DAMN_DMCA
  88     set_description( _("DVD input module, uses libdvdcss if installed") );
  89     i = 90;
  90 #else
  91     set_description( _("DVD input module, uses libdvdcss") );
  92     i = 100;
  93 #endif
  94     add_shortcut( "dvdold" );
  95     add_submodule();
  96         set_capability( "access", i );
  97         set_callbacks( E_(DVDOpen), E_(DVDClose) );
  98     add_submodule();
  99         set_capability( "demux", 0 );
 100         set_callbacks( E_(DVDInit), NULL );
 101 #ifdef GOD_DAMN_DMCA
 102     ProbeLibDVDCSS();
 103 #endif
 104 vlc_module_end();
 105
 106 #if 0 /* FIXME */
 107     UnprobeLibDVDCSS();
 108 #endif
 109
 110 /* Following functions are local */
 111
 112 #ifdef GOD_DAMN_DMCA
 113 /*****************************************************************************
 114  * ProbeLibDVDCSS: look for a libdvdcss object.
 115  *****************************************************************************
 116  * This functions looks for libdvdcss, using dlopen(), and fills function
 117  * pointers with what it finds. On failure, uses the dummy libdvdcss
 118  * replacement provided by vlc.
 119  *****************************************************************************/
 120 static void ProbeLibDVDCSS( void )
 121 {
 122     static char *pp_filelist[] = { "libdvdcss.so.2",
 123                                    "./libdvdcss.so.2",
 124                                    "./lib/libdvdcss.so.2",
 125                                    "libdvdcss.so.1",
 126                                    "./libdvdcss.so.1",
 127                                    "./lib/libdvdcss.so.1",
 128                                    NULL };
 129     char **pp_file = pp_filelist;
 130
 131     /* Try to open the dynamic object */
 132     do
 133     {
 134         p_libdvdcss = dlopen( *pp_file, RTLD_LAZY );
 135         if( p_libdvdcss != NULL )
 136         {
 137 //X            intf_WarnMsg( 2, "module: builtin module `dvd' found libdvdcss "
 138 //X                             "in `%s'", *pp_file );
 139             break;
 140         }
 141         pp_file++;
 142
 143     } while( *pp_file != NULL );
 144
 145     /* If libdvdcss.so was found, check that it's valid */
 146     if( p_libdvdcss == NULL )
 147     {
 148 //X        intf_ErrMsg( "dvd warning: libdvdcss.so.2 not present" );
 149     }
 150     else
 151     {
 152         ____dvdcss_open = dlsym( p_libdvdcss, "dvdcss_open" );
 153         ____dvdcss_close = dlsym( p_libdvdcss, "dvdcss_close" );
 154         ____dvdcss_title = dlsym( p_libdvdcss, "dvdcss_title" );
 155         ____dvdcss_seek = dlsym( p_libdvdcss, "dvdcss_seek" );
 156         ____dvdcss_read = dlsym( p_libdvdcss, "dvdcss_read" );
 157         ____dvdcss_readv = dlsym( p_libdvdcss, "dvdcss_readv" );
 158         ____dvdcss_error = dlsym( p_libdvdcss, "dvdcss_error" );
 159
 160         if( ____dvdcss_open == NULL || ____dvdcss_close == NULL
 161              || ____dvdcss_title == NULL || ____dvdcss_seek == NULL
 162              || ____dvdcss_read == NULL || ____dvdcss_readv == NULL
 163              || ____dvdcss_error == NULL )
 164         {
 165 //X            intf_ErrMsg( "dvd warning: missing symbols in libdvdcss.so.2, "
 166 //X                         "this shouldn't happen !" );
 167             dlclose( p_libdvdcss );
 168             p_libdvdcss = NULL;
 169         }
 170     }
 171
 172     /* If libdvdcss was not found or was not valid, use the dummy
 173      * replacement functions. */
 174     if( p_libdvdcss == NULL )
 175     {
 176 //X        intf_ErrMsg( "dvd warning: no valid libdvdcss found, "
 177 //X                     "I will only play unencrypted DVDs" );
 178 //X        intf_ErrMsg( "dvd warning: get libdvdcss at "
 179 //X                     "http://www.videolan.org/libdvdcss/" );
 180
 181         ____dvdcss_open = dummy_dvdcss_open;
 182         ____dvdcss_close = dummy_dvdcss_close;
 183         ____dvdcss_title = dummy_dvdcss_title;
 184         ____dvdcss_seek = dummy_dvdcss_seek;
 185         ____dvdcss_read = dummy_dvdcss_read;
 186         ____dvdcss_readv = dummy_dvdcss_readv;
 187         ____dvdcss_error = dummy_dvdcss_error;
 188     }
 189 }
 190
 191 /*****************************************************************************
 192  * UnprobeLibDVDCSS: free resources allocated by ProbeLibDVDCSS, if any.
 193  *****************************************************************************/
 194 static void UnprobeLibDVDCSS( void )
 195 {
 196     if( p_libdvdcss != NULL )
 197     {
 198         dlclose( p_libdvdcss );
 199         p_libdvdcss = NULL;
 200     }
 201 }
 202
 203 /* Dummy libdvdcss with minimal DVD access. */
 204
 205 /*****************************************************************************
 206  * Local structure
 207  *****************************************************************************/
 208 struct dvdcss_s
 209 {
 210     /* File descriptor */
 211     int i_fd;
 212 };
 213
 214 /*****************************************************************************
 215  * dvdcss_open: initialize library, open a DVD device, crack CSS key
 216  *****************************************************************************/
 217 extern dvdcss_handle dummy_dvdcss_open ( char *psz_target )
 218 {
 219     dvdcss_handle dvdcss;
 220     dvd_struct    dvd;
 221
 222     /* Allocate the library structure */
 223     dvdcss = malloc( sizeof( struct dvdcss_s ) );
 224     if( dvdcss == NULL )
 225     {
 226         fprintf( stderr, "dvd error: "
 227                          "dummy libdvdcss could not allocate memory\n" );
 228         return NULL;
 229     }
 230
 231     /* Open the device */
 232     dvdcss->i_fd = open( psz_target, 0 );
 233     if( dvdcss->i_fd < 0 )
 234     {
 235         fprintf( stderr, "dvd error: "
 236                          "dummy libdvdcss could not open device\n" );
 237         free( dvdcss );
 238         return NULL;
 239     }
 240
 241     /* Check for encryption or ioctl failure */
 242     dvd.type = DVD_STRUCT_COPYRIGHT;
 243     dvd.copyright.layer_num = 0;
 244     if( ioctl( dvdcss->i_fd, DVD_READ_STRUCT, &dvd ) != 0
 245          || dvd.copyright.cpst )
 246     {
 247         fprintf( stderr, "dvd error: "
 248                          "dummy libdvdcss could not decrypt disc\n" );
 249         close( dvdcss->i_fd );
 250         free( dvdcss );
 251         return NULL;
 252     }
 253
 254     return dvdcss;
 255 }
 256
 257 /*****************************************************************************
 258  * dvdcss_error: return the last libdvdcss error message
 259  *****************************************************************************/
 260 extern char * dummy_dvdcss_error ( dvdcss_handle dvdcss )
 261 {
 262     return "generic error";
 263 }
 264
 265 /*****************************************************************************
 266  * dvdcss_seek: seek into the device
 267  *****************************************************************************/
 268 extern int dummy_dvdcss_seek ( dvdcss_handle dvdcss, int i_blocks,
 269                                                      int i_flags )
 270 {
 271     off_t i_read;
 272
 273     i_read = lseek( dvdcss->i_fd,
 274                     (off_t)i_blocks * (off_t)DVDCSS_BLOCK_SIZE, SEEK_SET );
 275
 276     return i_read / DVDCSS_BLOCK_SIZE;
 277 }
 278
 279 /*****************************************************************************
 280  * dvdcss_title: crack the current title key if needed
 281  *****************************************************************************/
 282 extern int dummy_dvdcss_title ( dvdcss_handle dvdcss, int i_block )
 283 {
 284     return 0;
 285 }
 286
 287 /*****************************************************************************
 288  * dvdcss_read: read data from the device, decrypt if requested
 289  *****************************************************************************/
 290 extern int dummy_dvdcss_read ( dvdcss_handle dvdcss, void *p_buffer,
 291                                                      int i_blocks,
 292                                                      int i_flags )
 293 {
 294     int i_bytes;
 295
 296     i_bytes = read( dvdcss->i_fd, p_buffer,
 297                     (size_t)i_blocks * DVDCSS_BLOCK_SIZE );
 298
 299     return i_bytes / DVDCSS_BLOCK_SIZE;
 300 }
 301
 302 /*****************************************************************************
 303  * dvdcss_readv: read data to an iovec structure, decrypt if reaquested
 304  *****************************************************************************/
 305 extern int dummy_dvdcss_readv ( dvdcss_handle dvdcss, void *p_iovec,
 306                                                       int i_blocks,
 307                                                       int i_flags )
 308 {
 309     int i_read;
 310
 311     i_read = readv( dvdcss->i_fd, (struct iovec*)p_iovec, i_blocks );
 312
 313     return i_read / DVDCSS_BLOCK_SIZE;
 314 }
 315
 316 /*****************************************************************************
 317  * dvdcss_close: close the DVD device and clean up the library
 318  *****************************************************************************/
 319 extern int dummy_dvdcss_close ( dvdcss_handle dvdcss )
 320 {
 321     int i_ret;
 322
 323     i_ret = close( dvdcss->i_fd );
 324
 325     if( i_ret < 0 )
 326     {
 327         return i_ret;
 328     }
 329
 330     free( dvdcss );
 331
 332     return 0;
 333 }
 334
 335 #endif
 336