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 1.29 2002/04/04 05:08:05 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 <videolan/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  * Capabilities defined in the other files.
  49  *****************************************************************************/
  50 void _M( access_getfunctions)( function_list_t * p_function_list );
  51 void _M( demux_getfunctions)( function_list_t * p_function_list );
  52
  53 /*****************************************************************************
  54  * Local prototypes.
  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  * Build configuration tree.
  64  *****************************************************************************/
  65 MODULE_CONFIG_START
  66 ADD_CATEGORY_HINT( "[dvd:][device][@raw_device][@[title][,[chapter][,angle]]]", NULL )
  67 MODULE_CONFIG_STOP
  68
  69 MODULE_INIT_START
  70     ADD_CAPABILITY( DEMUX, 0 )
  71 #ifdef GOD_DAMN_DMCA
  72     SET_DESCRIPTION( "DVD input module, uses libdvdcss if present" )
  73     ADD_CAPABILITY( ACCESS, 90 )
  74 #else
  75     SET_DESCRIPTION( "DVD input module, uses libdvdcss" )
  76     ADD_CAPABILITY( ACCESS, 100 )
  77 #endif
  78     ADD_SHORTCUT( "dvd" )
  79 MODULE_INIT_STOP
  80
  81 MODULE_ACTIVATE_START
  82     _M( access_getfunctions)( &p_module->p_functions->access );
  83     _M( demux_getfunctions)( &p_module->p_functions->demux );
  84 #ifdef GOD_DAMN_DMCA
  85     ProbeLibDVDCSS();
  86 #endif
  87 MODULE_ACTIVATE_STOP
  88
  89 MODULE_DEACTIVATE_START
  90 #ifdef GOD_DAMN_DMCA
  91     UnprobeLibDVDCSS();
  92 #endif
  93 MODULE_DEACTIVATE_STOP
  94
  95
  96 /* Following functions are local */
  97
  98 #ifdef GOD_DAMN_DMCA
  99 /*****************************************************************************
 100  * ProbeLibDVDCSS: look for a libdvdcss object.
 101  *****************************************************************************
 102  * This functions looks for libdvdcss, using dlopen(), and fills function
 103  * pointers with what it finds. On failure, uses the dummy libdvdcss
 104  * replacement provided by vlc.
 105  *****************************************************************************/
 106 static void ProbeLibDVDCSS( void )
 107 {
 108     static char *pp_filelist[4] = { "libdvdcss.so.2",
 109                                     "./libdvdcss.so.2",
 110                                     "./lib/libdvdcss.so.2",
 111                                     "libdvdcss.so.1",
 112                                     "./libdvdcss.so.1",
 113                                     "./lib/libdvdcss.so.1",
 114                                     NULL };
 115     char **pp_file = pp_filelist;
 116
 117     /* Try to open the dynamic object */
 118     do
 119     {
 120         p_libdvdcss = dlopen( *pp_file, RTLD_LAZY );
 121         if( p_libdvdcss != NULL )
 122         {
 123             intf_WarnMsg( 2, "module: builtin module `dvd' found libdvdcss "
 124                              "in `%s'", *pp_file );
 125             break;
 126         }
 127         pp_file++;
 128
 129     } while( *pp_file != NULL );
 130
 131     /* If libdvdcss.so was found, check that it's valid */
 132     if( p_libdvdcss == NULL )
 133     {
 134         intf_ErrMsg( "dvd warning: libdvdcss.so.2 not present" );
 135     }
 136     else
 137     {
 138         ____dvdcss_open = dlsym( p_libdvdcss, "dvdcss_open" );
 139         ____dvdcss_close = dlsym( p_libdvdcss, "dvdcss_close" );
 140         ____dvdcss_title = dlsym( p_libdvdcss, "dvdcss_title" );
 141         ____dvdcss_seek = dlsym( p_libdvdcss, "dvdcss_seek" );
 142         ____dvdcss_read = dlsym( p_libdvdcss, "dvdcss_read" );
 143         ____dvdcss_readv = dlsym( p_libdvdcss, "dvdcss_readv" );
 144         ____dvdcss_error = dlsym( p_libdvdcss, "dvdcss_error" );
 145
 146         if( ____dvdcss_open == NULL || ____dvdcss_close == NULL
 147              || ____dvdcss_title == NULL || ____dvdcss_seek == NULL
 148              || ____dvdcss_read == NULL || ____dvdcss_readv == NULL
 149              || ____dvdcss_error == NULL )
 150         {
 151             intf_ErrMsg( "dvd warning: missing symbols in libdvdcss.so.2, "
 152                          "this shouldn't happen !" );
 153             dlclose( p_libdvdcss );
 154             p_libdvdcss = NULL;
 155         }
 156     }
 157
 158     /* If libdvdcss was not found or was not valid, use the dummy
 159      * replacement functions. */
 160     if( p_libdvdcss == NULL )
 161     {
 162         intf_ErrMsg( "dvd warning: no valid libdvdcss found, "
 163                      "I will only play unencrypted DVDs" );
 164         intf_ErrMsg( "dvd warning: get libdvdcss at "
 165                      "http://www.videolan.org/libdvdcss/" );
 166
 167         ____dvdcss_open = dummy_dvdcss_open;
 168         ____dvdcss_close = dummy_dvdcss_close;
 169         ____dvdcss_title = dummy_dvdcss_title;
 170         ____dvdcss_seek = dummy_dvdcss_seek;
 171         ____dvdcss_read = dummy_dvdcss_read;
 172         ____dvdcss_readv = dummy_dvdcss_readv;
 173         ____dvdcss_error = dummy_dvdcss_error;
 174     }
 175 }
 176
 177 /*****************************************************************************
 178  * UnprobeLibDVDCSS: free resources allocated by ProbeLibDVDCSS, if any.
 179  *****************************************************************************/
 180 static void UnprobeLibDVDCSS( void )
 181 {
 182     if( p_libdvdcss != NULL )
 183     {
 184         dlclose( p_libdvdcss );
 185         p_libdvdcss = NULL;
 186     }
 187 }
 188
 189 /* Dummy libdvdcss with minimal DVD access. */
 190
 191 /*****************************************************************************
 192  * Local structure
 193  *****************************************************************************/
 194 struct dvdcss_s
 195 {
 196     /* File descriptor */
 197     int i_fd;
 198 };
 199
 200 /*****************************************************************************
 201  * dvdcss_open: initialize library, open a DVD device, crack CSS key
 202  *****************************************************************************/
 203 extern dvdcss_handle dummy_dvdcss_open ( char *psz_target )
 204 {
 205     dvdcss_handle dvdcss;
 206     dvd_struct    dvd;
 207
 208     /* Allocate the library structure */
 209     dvdcss = malloc( sizeof( struct dvdcss_s ) );
 210     if( dvdcss == NULL )
 211     {
 212         fprintf( stderr, "dvd error: "
 213                          "dummy libdvdcss could not allocate memory\n" );
 214         return NULL;
 215     }
 216
 217     /* Open the device */
 218     dvdcss->i_fd = open( psz_target, 0 );
 219     if( dvdcss->i_fd < 0 )
 220     {
 221         fprintf( stderr, "dvd error: "
 222                          "dummy libdvdcss could not open device\n" );
 223         free( dvdcss );
 224         return NULL;
 225     }
 226
 227     /* Check for encryption or ioctl failure */
 228     dvd.type = DVD_STRUCT_COPYRIGHT;
 229     dvd.copyright.layer_num = 0;
 230     if( ioctl( dvdcss->i_fd, DVD_READ_STRUCT, &dvd ) != 0
 231          || dvd.copyright.cpst )
 232     {
 233         fprintf( stderr, "dvd error: "
 234                          "dummy libdvdcss could not decrypt disc\n" );
 235         close( dvdcss->i_fd );
 236         free( dvdcss );
 237         return NULL;
 238     }
 239
 240     return dvdcss;
 241 }
 242
 243 /*****************************************************************************
 244  * dvdcss_error: return the last libdvdcss error message
 245  *****************************************************************************/
 246 extern char * dummy_dvdcss_error ( dvdcss_handle dvdcss )
 247 {
 248     return "generic error";
 249 }
 250
 251 /*****************************************************************************
 252  * dvdcss_seek: seek into the device
 253  *****************************************************************************/
 254 extern int dummy_dvdcss_seek ( dvdcss_handle dvdcss, int i_blocks,
 255                                                      int i_flags )
 256 {
 257     off_t i_read;
 258
 259     i_read = lseek( dvdcss->i_fd,
 260                     (off_t)i_blocks * (off_t)DVDCSS_BLOCK_SIZE, SEEK_SET );
 261
 262     return i_read / DVDCSS_BLOCK_SIZE;
 263 }
 264
 265 /*****************************************************************************
 266  * dvdcss_title: crack the current title key if needed
 267  *****************************************************************************/
 268 extern int dummy_dvdcss_title ( dvdcss_handle dvdcss, int i_block )
 269 {
 270     return 0;
 271 }
 272
 273 /*****************************************************************************
 274  * dvdcss_read: read data from the device, decrypt if requested
 275  *****************************************************************************/
 276 extern int dummy_dvdcss_read ( dvdcss_handle dvdcss, void *p_buffer,
 277                                                      int i_blocks,
 278                                                      int i_flags )
 279 {
 280     int i_bytes;
 281
 282     i_bytes = read( dvdcss->i_fd, p_buffer,
 283                     (size_t)i_blocks * DVDCSS_BLOCK_SIZE );
 284
 285     return i_bytes / DVDCSS_BLOCK_SIZE;
 286 }
 287
 288 /*****************************************************************************
 289  * dvdcss_readv: read data to an iovec structure, decrypt if reaquested
 290  *****************************************************************************/
 291 extern int dummy_dvdcss_readv ( dvdcss_handle dvdcss, void *p_iovec,
 292                                                       int i_blocks,
 293                                                       int i_flags )
 294 {
 295     int i_read;
 296
 297     i_read = readv( dvdcss->i_fd, (struct iovec*)p_iovec, i_blocks );
 298
 299     return i_read / DVDCSS_BLOCK_SIZE;
 300 }
 301
 302 /*****************************************************************************
 303  * dvdcss_close: close the DVD device and clean up the library
 304  *****************************************************************************/
 305 extern int dummy_dvdcss_close ( dvdcss_handle dvdcss )
 306 {
 307     int i_ret;
 308
 309     i_ret = close( dvdcss->i_fd );
 310
 311     if( i_ret < 0 )
 312     {
 313         return i_ret;
 314     }
 315
 316     free( dvdcss );
 317
 318     return 0;
 319 }
 320
 321 #endif
 322