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 1.28 2002/04/03 16:22:23 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     char *pp_filelist[4] = { "libdvdcss.so.1",
 109                              "./libdvdcss.so.1",
 110                              "./lib/libdvdcss.so.1",
 111                              NULL };
 112     char **pp_file = pp_filelist;
 113
 114     /* Try to open the dynamic object */
 115     do
 116     {
 117         p_libdvdcss = dlopen( *pp_file, RTLD_LAZY );
 118         if( p_libdvdcss != NULL )
 119         {
 120             intf_WarnMsg( 2, "module: builtin module `dvd' found libdvdcss "
 121                              "in `%s'", *pp_file );
 122             break;
 123         }
 124         pp_file++;
 125
 126     } while( *pp_file != NULL );
 127
 128     /* If libdvdcss.so was found, check that it's valid */
 129     if( p_libdvdcss == NULL )
 130     {
 131         intf_ErrMsg( "dvd warning: libdvdcss.so.1 not present" );
 132     }
 133     else
 134     {
 135         ____dvdcss_open = dlsym( p_libdvdcss, "dvdcss_open" );
 136         ____dvdcss_close = dlsym( p_libdvdcss, "dvdcss_close" );
 137         ____dvdcss_title = dlsym( p_libdvdcss, "dvdcss_title" );
 138         ____dvdcss_seek = dlsym( p_libdvdcss, "dvdcss_seek" );
 139         ____dvdcss_read = dlsym( p_libdvdcss, "dvdcss_read" );
 140         ____dvdcss_readv = dlsym( p_libdvdcss, "dvdcss_readv" );
 141         ____dvdcss_error = dlsym( p_libdvdcss, "dvdcss_error" );
 142
 143         if( ____dvdcss_open == NULL || ____dvdcss_close == NULL
 144              || ____dvdcss_title == NULL || ____dvdcss_seek == NULL
 145              || ____dvdcss_read == NULL || ____dvdcss_readv == NULL
 146              || ____dvdcss_error == NULL )
 147         {
 148             intf_ErrMsg( "dvd warning: missing symbols in libdvdcss.so.1, "
 149                          "this shouldn't happen !" );
 150             dlclose( p_libdvdcss );
 151             p_libdvdcss = NULL;
 152         }
 153     }
 154
 155     /* If libdvdcss was not found or was not valid, use the dummy
 156      * replacement functions. */
 157     if( p_libdvdcss == NULL )
 158     {
 159         intf_ErrMsg( "dvd warning: no valid libdvdcss found, "
 160                      "I will only play unencrypted DVDs" );
 161         intf_ErrMsg( "dvd warning: get libdvdcss at "
 162                      "http://www.videolan.org/libdvdcss/" );
 163
 164         ____dvdcss_open = dummy_dvdcss_open;
 165         ____dvdcss_close = dummy_dvdcss_close;
 166         ____dvdcss_title = dummy_dvdcss_title;
 167         ____dvdcss_seek = dummy_dvdcss_seek;
 168         ____dvdcss_read = dummy_dvdcss_read;
 169         ____dvdcss_readv = dummy_dvdcss_readv;
 170         ____dvdcss_error = dummy_dvdcss_error;
 171     }
 172 }
 173
 174 /*****************************************************************************
 175  * UnprobeLibDVDCSS: free resources allocated by ProbeLibDVDCSS, if any.
 176  *****************************************************************************/
 177 static void UnprobeLibDVDCSS( void )
 178 {
 179     if( p_libdvdcss != NULL )
 180     {
 181         dlclose( p_libdvdcss );
 182         p_libdvdcss = NULL;
 183     }
 184 }
 185
 186 /* Dummy libdvdcss with minimal DVD access. */
 187
 188 /*****************************************************************************
 189  * Local structure
 190  *****************************************************************************/
 191 struct dvdcss_s
 192 {
 193     /* File descriptor */
 194     int i_fd;
 195 };
 196
 197 /*****************************************************************************
 198  * dvdcss_open: initialize library, open a DVD device, crack CSS key
 199  *****************************************************************************/
 200 extern dvdcss_handle dummy_dvdcss_open ( char *psz_target )
 201 {
 202     dvdcss_handle dvdcss;
 203     dvd_struct    dvd;
 204
 205     /* Allocate the library structure */
 206     dvdcss = malloc( sizeof( struct dvdcss_s ) );
 207     if( dvdcss == NULL )
 208     {
 209         fprintf( stderr, "dvd error: "
 210                          "dummy libdvdcss could not allocate memory\n" );
 211         return NULL;
 212     }
 213
 214     /* Open the device */
 215     dvdcss->i_fd = open( psz_target, 0 );
 216     if( dvdcss->i_fd < 0 )
 217     {
 218         fprintf( stderr, "dvd error: "
 219                          "dummy libdvdcss could not open device\n" );
 220         free( dvdcss );
 221         return NULL;
 222     }
 223
 224     /* Check for encryption or ioctl failure */
 225     dvd.type = DVD_STRUCT_COPYRIGHT;
 226     dvd.copyright.layer_num = 0;
 227     if( ioctl( dvdcss->i_fd, DVD_READ_STRUCT, &dvd ) != 0
 228          || dvd.copyright.cpst )
 229     {
 230         fprintf( stderr, "dvd error: "
 231                          "dummy libdvdcss could not decrypt disc\n" );
 232         close( dvdcss->i_fd );
 233         free( dvdcss );
 234         return NULL;
 235     }
 236
 237     return dvdcss;
 238 }
 239
 240 /*****************************************************************************
 241  * dvdcss_error: return the last libdvdcss error message
 242  *****************************************************************************/
 243 extern char * dummy_dvdcss_error ( dvdcss_handle dvdcss )
 244 {
 245     return "generic error";
 246 }
 247
 248 /*****************************************************************************
 249  * dvdcss_seek: seek into the device
 250  *****************************************************************************/
 251 extern int dummy_dvdcss_seek ( dvdcss_handle dvdcss, int i_blocks,
 252                                                      int i_flags )
 253 {
 254     off_t i_read;
 255
 256     i_read = lseek( dvdcss->i_fd,
 257                     (off_t)i_blocks * (off_t)DVDCSS_BLOCK_SIZE, SEEK_SET );
 258
 259     return i_read / DVDCSS_BLOCK_SIZE;
 260 }
 261
 262 /*****************************************************************************
 263  * dvdcss_title: crack the current title key if needed
 264  *****************************************************************************/
 265 extern int dummy_dvdcss_title ( dvdcss_handle dvdcss, int i_block )
 266 {
 267     return 0;
 268 }
 269
 270 /*****************************************************************************
 271  * dvdcss_read: read data from the device, decrypt if requested
 272  *****************************************************************************/
 273 extern int dummy_dvdcss_read ( dvdcss_handle dvdcss, void *p_buffer,
 274                                                      int i_blocks,
 275                                                      int i_flags )
 276 {
 277     int i_bytes;
 278
 279     i_bytes = read( dvdcss->i_fd, p_buffer,
 280                     (size_t)i_blocks * DVDCSS_BLOCK_SIZE );
 281
 282     return i_bytes / DVDCSS_BLOCK_SIZE;
 283 }
 284
 285 /*****************************************************************************
 286  * dvdcss_readv: read data to an iovec structure, decrypt if reaquested
 287  *****************************************************************************/
 288 extern int dummy_dvdcss_readv ( dvdcss_handle dvdcss, void *p_iovec,
 289                                                       int i_blocks,
 290                                                       int i_flags )
 291 {
 292     int i_read;
 293
 294     i_read = readv( dvdcss->i_fd, (struct iovec*)p_iovec, i_blocks );
 295
 296     return i_read / DVDCSS_BLOCK_SIZE;
 297 }
 298
 299 /*****************************************************************************
 300  * dvdcss_close: close the DVD device and clean up the library
 301  *****************************************************************************/
 302 extern int dummy_dvdcss_close ( dvdcss_handle dvdcss )
 303 {
 304     int i_ret;
 305
 306     i_ret = close( dvdcss->i_fd );
 307
 308     if( i_ret < 0 )
 309     {
 310         return i_ret;
 311     }
 312
 313     free( dvdcss );
 314
 315     return 0;
 316 }
 317
 318 #endif
 319