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 1.32 2002/06/01 12:31:58 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 "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( N_("[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 MODULE_INIT_STOP
  79
  80 MODULE_ACTIVATE_START
  81     _M( access_getfunctions)( &p_module->p_functions->access );
  82     _M( demux_getfunctions)( &p_module->p_functions->demux );
  83 #ifdef GOD_DAMN_DMCA
  84     ProbeLibDVDCSS();
  85 #endif
  86 MODULE_ACTIVATE_STOP
  87
  88 MODULE_DEACTIVATE_START
  89 #ifdef GOD_DAMN_DMCA
  90     UnprobeLibDVDCSS();
  91 #endif
  92 MODULE_DEACTIVATE_STOP
  93
  94
  95 /* Following functions are local */
  96
  97 #ifdef GOD_DAMN_DMCA
  98 /*****************************************************************************
  99  * ProbeLibDVDCSS: look for a libdvdcss object.
 100  *****************************************************************************
 101  * This functions looks for libdvdcss, using dlopen(), and fills function
 102  * pointers with what it finds. On failure, uses the dummy libdvdcss
 103  * replacement provided by vlc.
 104  *****************************************************************************/
 105 static void ProbeLibDVDCSS( void )
 106 {
 107     static char *pp_filelist[] = { "libdvdcss.so.2",
 108                                    "./libdvdcss.so.2",
 109                                    "./lib/libdvdcss.so.2",
 110                                    "libdvdcss.so.1",
 111                                    "./libdvdcss.so.1",
 112                                    "./lib/libdvdcss.so.1",
 113                                    NULL };
 114     char **pp_file = pp_filelist;
 115
 116     /* Try to open the dynamic object */
 117     do
 118     {
 119         p_libdvdcss = dlopen( *pp_file, RTLD_LAZY );
 120         if( p_libdvdcss != NULL )
 121         {
 122 //X            intf_WarnMsg( 2, "module: builtin module `dvd' found libdvdcss "
 123 //X                             "in `%s'", *pp_file );
 124             break;
 125         }
 126         pp_file++;
 127
 128     } while( *pp_file != NULL );
 129
 130     /* If libdvdcss.so was found, check that it's valid */
 131     if( p_libdvdcss == NULL )
 132     {
 133 //X        intf_ErrMsg( "dvd warning: libdvdcss.so.2 not present" );
 134     }
 135     else
 136     {
 137         ____dvdcss_open = dlsym( p_libdvdcss, "dvdcss_open" );
 138         ____dvdcss_close = dlsym( p_libdvdcss, "dvdcss_close" );
 139         ____dvdcss_title = dlsym( p_libdvdcss, "dvdcss_title" );
 140         ____dvdcss_seek = dlsym( p_libdvdcss, "dvdcss_seek" );
 141         ____dvdcss_read = dlsym( p_libdvdcss, "dvdcss_read" );
 142         ____dvdcss_readv = dlsym( p_libdvdcss, "dvdcss_readv" );
 143         ____dvdcss_error = dlsym( p_libdvdcss, "dvdcss_error" );
 144
 145         if( ____dvdcss_open == NULL || ____dvdcss_close == NULL
 146              || ____dvdcss_title == NULL || ____dvdcss_seek == NULL
 147              || ____dvdcss_read == NULL || ____dvdcss_readv == NULL
 148              || ____dvdcss_error == NULL )
 149         {
 150 //X            intf_ErrMsg( "dvd warning: missing symbols in libdvdcss.so.2, "
 151 //X                         "this shouldn't happen !" );
 152             dlclose( p_libdvdcss );
 153             p_libdvdcss = NULL;
 154         }
 155     }
 156
 157     /* If libdvdcss was not found or was not valid, use the dummy
 158      * replacement functions. */
 159     if( p_libdvdcss == NULL )
 160     {
 161 //X        intf_ErrMsg( "dvd warning: no valid libdvdcss found, "
 162 //X                     "I will only play unencrypted DVDs" );
 163 //X        intf_ErrMsg( "dvd warning: get libdvdcss at "
 164 //X                     "http://www.videolan.org/libdvdcss/" );
 165
 166         ____dvdcss_open = dummy_dvdcss_open;
 167         ____dvdcss_close = dummy_dvdcss_close;
 168         ____dvdcss_title = dummy_dvdcss_title;
 169         ____dvdcss_seek = dummy_dvdcss_seek;
 170         ____dvdcss_read = dummy_dvdcss_read;
 171         ____dvdcss_readv = dummy_dvdcss_readv;
 172         ____dvdcss_error = dummy_dvdcss_error;
 173     }
 174 }
 175
 176 /*****************************************************************************
 177  * UnprobeLibDVDCSS: free resources allocated by ProbeLibDVDCSS, if any.
 178  *****************************************************************************/
 179 static void UnprobeLibDVDCSS( void )
 180 {
 181     if( p_libdvdcss != NULL )
 182     {
 183         dlclose( p_libdvdcss );
 184         p_libdvdcss = NULL;
 185     }
 186 }
 187
 188 /* Dummy libdvdcss with minimal DVD access. */
 189
 190 /*****************************************************************************
 191  * Local structure
 192  *****************************************************************************/
 193 struct dvdcss_s
 194 {
 195     /* File descriptor */
 196     int i_fd;
 197 };
 198
 199 /*****************************************************************************
 200  * dvdcss_open: initialize library, open a DVD device, crack CSS key
 201  *****************************************************************************/
 202 extern dvdcss_handle dummy_dvdcss_open ( char *psz_target )
 203 {
 204     dvdcss_handle dvdcss;
 205     dvd_struct    dvd;
 206
 207     /* Allocate the library structure */
 208     dvdcss = malloc( sizeof( struct dvdcss_s ) );
 209     if( dvdcss == NULL )
 210     {
 211         fprintf( stderr, "dvd error: "
 212                          "dummy libdvdcss could not allocate memory\n" );
 213         return NULL;
 214     }
 215
 216     /* Open the device */
 217     dvdcss->i_fd = open( psz_target, 0 );
 218     if( dvdcss->i_fd < 0 )
 219     {
 220         fprintf( stderr, "dvd error: "
 221                          "dummy libdvdcss could not open device\n" );
 222         free( dvdcss );
 223         return NULL;
 224     }
 225
 226     /* Check for encryption or ioctl failure */
 227     dvd.type = DVD_STRUCT_COPYRIGHT;
 228     dvd.copyright.layer_num = 0;
 229     if( ioctl( dvdcss->i_fd, DVD_READ_STRUCT, &dvd ) != 0
 230          || dvd.copyright.cpst )
 231     {
 232         fprintf( stderr, "dvd error: "
 233                          "dummy libdvdcss could not decrypt disc\n" );
 234         close( dvdcss->i_fd );
 235         free( dvdcss );
 236         return NULL;
 237     }
 238
 239     return dvdcss;
 240 }
 241
 242 /*****************************************************************************
 243  * dvdcss_error: return the last libdvdcss error message
 244  *****************************************************************************/
 245 extern char * dummy_dvdcss_error ( dvdcss_handle dvdcss )
 246 {
 247     return "generic error";
 248 }
 249
 250 /*****************************************************************************
 251  * dvdcss_seek: seek into the device
 252  *****************************************************************************/
 253 extern int dummy_dvdcss_seek ( dvdcss_handle dvdcss, int i_blocks,
 254                                                      int i_flags )
 255 {
 256     off_t i_read;
 257
 258     i_read = lseek( dvdcss->i_fd,
 259                     (off_t)i_blocks * (off_t)DVDCSS_BLOCK_SIZE, SEEK_SET );
 260
 261     return i_read / DVDCSS_BLOCK_SIZE;
 262 }
 263
 264 /*****************************************************************************
 265  * dvdcss_title: crack the current title key if needed
 266  *****************************************************************************/
 267 extern int dummy_dvdcss_title ( dvdcss_handle dvdcss, int i_block )
 268 {
 269     return 0;
 270 }
 271
 272 /*****************************************************************************
 273  * dvdcss_read: read data from the device, decrypt if requested
 274  *****************************************************************************/
 275 extern int dummy_dvdcss_read ( dvdcss_handle dvdcss, void *p_buffer,
 276                                                      int i_blocks,
 277                                                      int i_flags )
 278 {
 279     int i_bytes;
 280
 281     i_bytes = read( dvdcss->i_fd, p_buffer,
 282                     (size_t)i_blocks * DVDCSS_BLOCK_SIZE );
 283
 284     return i_bytes / DVDCSS_BLOCK_SIZE;
 285 }
 286
 287 /*****************************************************************************
 288  * dvdcss_readv: read data to an iovec structure, decrypt if reaquested
 289  *****************************************************************************/
 290 extern int dummy_dvdcss_readv ( dvdcss_handle dvdcss, void *p_iovec,
 291                                                       int i_blocks,
 292                                                       int i_flags )
 293 {
 294     int i_read;
 295
 296     i_read = readv( dvdcss->i_fd, (struct iovec*)p_iovec, i_blocks );
 297
 298     return i_read / DVDCSS_BLOCK_SIZE;
 299 }
 300
 301 /*****************************************************************************
 302  * dvdcss_close: close the DVD device and clean up the library
 303  *****************************************************************************/
 304 extern int dummy_dvdcss_close ( dvdcss_handle dvdcss )
 305 {
 306     int i_ret;
 307
 308     i_ret = close( dvdcss->i_fd );
 309
 310     if( i_ret < 0 )
 311     {
 312         return i_ret;
 313     }
 314
 315     free( dvdcss );
 316
 317     return 0;
 318 }
 319
 320 #endif
 321