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 1.2 2002/08/07 00:29:36 sam 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     "title: decrypted title key is guessed from the encrypted sectors of " \
  68            "the stream. Thus it should work with a file as well as the " \
  69            "DVD device. But it sometimes takes much time to decrypt a title " \
  70            "key and may even fail. With this method, the key is only checked "\
  71            "at the beginning of each title, so it won't work if the key " \
  72            "changes in the middle of a title.\n" \
  73     "disc: the disc key is first cracked, then all title keys can be " \
  74            "decrypted instantly, which allows us to check them often.\n" \
  75     "key: the same as \"disc\" if you don't have a file with player keys " \
  76            "at compilation time. If you do, the decryption of the disc key " \
  77            "will be faster with this method. It is the one that was used by " \
  78            "libcss.\n" \
  79     "The default method is: key.")
  80
  81 static char *cssmethod_list[] = { "title", "disc", "key", NULL };
  82
  83 vlc_module_begin();
  84     int i;
  85     add_category_hint( N_("[dvd:][device][@raw_device][@[title][,[chapter][,angle]]]"), NULL );
  86     add_string_from_list( "dvd-css-method", NULL, cssmethod_list, NULL,
  87                           CSSMETHOD_TEXT, CSSMETHOD_LONGTEXT );
  88 #ifdef GOD_DAMN_DMCA
  89     set_description( _("DVD input module, uses libdvdcss if installed") );
  90     i = 90;
  91 #else
  92     set_description( _("DVD input module, uses libdvdcss") );
  93     i = 100;
  94 #endif
  95     add_shortcut( "dvdold" );
  96     add_submodule();
  97         set_capability( "access", i );
  98         set_callbacks( E_(DVDOpen), E_(DVDClose) );
  99     add_submodule();
 100         set_capability( "demux", 0 );
 101         set_callbacks( E_(DVDInit), E_(DVDEnd) );
 102 #ifdef GOD_DAMN_DMCA
 103     ProbeLibDVDCSS();
 104 #endif
 105 vlc_module_end();
 106
 107 #if 0 /* FIXME */
 108     UnprobeLibDVDCSS();
 109 #endif
 110
 111 /* Following functions are local */
 112
 113 #ifdef GOD_DAMN_DMCA
 114 /*****************************************************************************
 115  * ProbeLibDVDCSS: look for a libdvdcss object.
 116  *****************************************************************************
 117  * This functions looks for libdvdcss, using dlopen(), and fills function
 118  * pointers with what it finds. On failure, uses the dummy libdvdcss
 119  * replacement provided by vlc.
 120  *****************************************************************************/
 121 static void ProbeLibDVDCSS( void )
 122 {
 123     static char *pp_filelist[] = { "libdvdcss.so.2",
 124                                    "./libdvdcss.so.2",
 125                                    "./lib/libdvdcss.so.2",
 126                                    "libdvdcss.so.1",
 127                                    "./libdvdcss.so.1",
 128                                    "./lib/libdvdcss.so.1",
 129                                    NULL };
 130     char **pp_file = pp_filelist;
 131
 132     /* Try to open the dynamic object */
 133     do
 134     {
 135         p_libdvdcss = dlopen( *pp_file, RTLD_LAZY );
 136         if( p_libdvdcss != NULL )
 137         {
 138 //X            intf_WarnMsg( 2, "module: builtin module `dvd' found libdvdcss "
 139 //X                             "in `%s'", *pp_file );
 140             break;
 141         }
 142         pp_file++;
 143
 144     } while( *pp_file != NULL );
 145
 146     /* If libdvdcss.so was found, check that it's valid */
 147     if( p_libdvdcss == NULL )
 148     {
 149 //X        intf_ErrMsg( "dvd warning: libdvdcss.so.2 not present" );
 150     }
 151     else
 152     {
 153         ____dvdcss_open = dlsym( p_libdvdcss, "dvdcss_open" );
 154         ____dvdcss_close = dlsym( p_libdvdcss, "dvdcss_close" );
 155         ____dvdcss_title = dlsym( p_libdvdcss, "dvdcss_title" );
 156         ____dvdcss_seek = dlsym( p_libdvdcss, "dvdcss_seek" );
 157         ____dvdcss_read = dlsym( p_libdvdcss, "dvdcss_read" );
 158         ____dvdcss_readv = dlsym( p_libdvdcss, "dvdcss_readv" );
 159         ____dvdcss_error = dlsym( p_libdvdcss, "dvdcss_error" );
 160
 161         if( ____dvdcss_open == NULL || ____dvdcss_close == NULL
 162              || ____dvdcss_title == NULL || ____dvdcss_seek == NULL
 163              || ____dvdcss_read == NULL || ____dvdcss_readv == NULL
 164              || ____dvdcss_error == NULL )
 165         {
 166 //X            intf_ErrMsg( "dvd warning: missing symbols in libdvdcss.so.2, "
 167 //X                         "this shouldn't happen !" );
 168             dlclose( p_libdvdcss );
 169             p_libdvdcss = NULL;
 170         }
 171     }
 172
 173     /* If libdvdcss was not found or was not valid, use the dummy
 174      * replacement functions. */
 175     if( p_libdvdcss == NULL )
 176     {
 177 //X        intf_ErrMsg( "dvd warning: no valid libdvdcss found, "
 178 //X                     "I will only play unencrypted DVDs" );
 179 //X        intf_ErrMsg( "dvd warning: get libdvdcss at "
 180 //X                     "http://www.videolan.org/libdvdcss/" );
 181
 182         ____dvdcss_open = dummy_dvdcss_open;
 183         ____dvdcss_close = dummy_dvdcss_close;
 184         ____dvdcss_title = dummy_dvdcss_title;
 185         ____dvdcss_seek = dummy_dvdcss_seek;
 186         ____dvdcss_read = dummy_dvdcss_read;
 187         ____dvdcss_readv = dummy_dvdcss_readv;
 188         ____dvdcss_error = dummy_dvdcss_error;
 189     }
 190 }
 191
 192 /*****************************************************************************
 193  * UnprobeLibDVDCSS: free resources allocated by ProbeLibDVDCSS, if any.
 194  *****************************************************************************/
 195 static void UnprobeLibDVDCSS( void )
 196 {
 197     if( p_libdvdcss != NULL )
 198     {
 199         dlclose( p_libdvdcss );
 200         p_libdvdcss = NULL;
 201     }
 202 }
 203
 204 /* Dummy libdvdcss with minimal DVD access. */
 205
 206 /*****************************************************************************
 207  * Local structure
 208  *****************************************************************************/
 209 struct dvdcss_s
 210 {
 211     /* File descriptor */
 212     int i_fd;
 213 };
 214
 215 /*****************************************************************************
 216  * dvdcss_open: initialize library, open a DVD device, crack CSS key
 217  *****************************************************************************/
 218 extern dvdcss_handle dummy_dvdcss_open ( char *psz_target )
 219 {
 220     dvdcss_handle dvdcss;
 221     dvd_struct    dvd;
 222
 223     /* Allocate the library structure */
 224     dvdcss = malloc( sizeof( struct dvdcss_s ) );
 225     if( dvdcss == NULL )
 226     {
 227         fprintf( stderr, "dvd error: "
 228                          "dummy libdvdcss could not allocate memory\n" );
 229         return NULL;
 230     }
 231
 232     /* Open the device */
 233     dvdcss->i_fd = open( psz_target, 0 );
 234     if( dvdcss->i_fd < 0 )
 235     {
 236         fprintf( stderr, "dvd error: "
 237                          "dummy libdvdcss could not open device\n" );
 238         free( dvdcss );
 239         return NULL;
 240     }
 241
 242     /* Check for encryption or ioctl failure */
 243     dvd.type = DVD_STRUCT_COPYRIGHT;
 244     dvd.copyright.layer_num = 0;
 245     if( ioctl( dvdcss->i_fd, DVD_READ_STRUCT, &dvd ) != 0
 246          || dvd.copyright.cpst )
 247     {
 248         fprintf( stderr, "dvd error: "
 249                          "dummy libdvdcss could not decrypt disc\n" );
 250         close( dvdcss->i_fd );
 251         free( dvdcss );
 252         return NULL;
 253     }
 254
 255     return dvdcss;
 256 }
 257
 258 /*****************************************************************************
 259  * dvdcss_error: return the last libdvdcss error message
 260  *****************************************************************************/
 261 extern char * dummy_dvdcss_error ( dvdcss_handle dvdcss )
 262 {
 263     return "generic error";
 264 }
 265
 266 /*****************************************************************************
 267  * dvdcss_seek: seek into the device
 268  *****************************************************************************/
 269 extern int dummy_dvdcss_seek ( dvdcss_handle dvdcss, int i_blocks,
 270                                                      int i_flags )
 271 {
 272     off_t i_read;
 273
 274     i_read = lseek( dvdcss->i_fd,
 275                     (off_t)i_blocks * (off_t)DVDCSS_BLOCK_SIZE, SEEK_SET );
 276
 277     return i_read / DVDCSS_BLOCK_SIZE;
 278 }
 279
 280 /*****************************************************************************
 281  * dvdcss_title: crack the current title key if needed
 282  *****************************************************************************/
 283 extern int dummy_dvdcss_title ( dvdcss_handle dvdcss, int i_block )
 284 {
 285     return 0;
 286 }
 287
 288 /*****************************************************************************
 289  * dvdcss_read: read data from the device, decrypt if requested
 290  *****************************************************************************/
 291 extern int dummy_dvdcss_read ( dvdcss_handle dvdcss, void *p_buffer,
 292                                                      int i_blocks,
 293                                                      int i_flags )
 294 {
 295     int i_bytes;
 296
 297     i_bytes = read( dvdcss->i_fd, p_buffer,
 298                     (size_t)i_blocks * DVDCSS_BLOCK_SIZE );
 299
 300     return i_bytes / DVDCSS_BLOCK_SIZE;
 301 }
 302
 303 /*****************************************************************************
 304  * dvdcss_readv: read data to an iovec structure, decrypt if reaquested
 305  *****************************************************************************/
 306 extern int dummy_dvdcss_readv ( dvdcss_handle dvdcss, void *p_iovec,
 307                                                       int i_blocks,
 308                                                       int i_flags )
 309 {
 310     int i_read;
 311
 312     i_read = readv( dvdcss->i_fd, (struct iovec*)p_iovec, i_blocks );
 313
 314     return i_read / DVDCSS_BLOCK_SIZE;
 315 }
 316
 317 /*****************************************************************************
 318  * dvdcss_close: close the DVD device and clean up the library
 319  *****************************************************************************/
 320 extern int dummy_dvdcss_close ( dvdcss_handle dvdcss )
 321 {
 322     int i_ret;
 323
 324     i_ret = close( dvdcss->i_fd );
 325
 326     if( i_ret < 0 )
 327     {
 328         return i_ret;
 329     }
 330
 331     free( dvdcss );
 332
 333     return 0;
 334 }
 335
 336 #endif
 337