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mpv/libmpdemux/dvdauth.c

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/* (C)2001,2002 by LGB (Gabor Lenart), based on example programs in libcss
lgb@lgb.hu
This source is part of MPlayer project. This source is copyrighted by
the author according to rules declared in GNU/GPL license.
2001 Inital version (LGB)
2001 fibmap_mplayer to avoid uid=0 mplayer need (LGB)
2001 Support for libcss with the new API (by ???)
2002/Jan/04 Use dlopen to access libcss.so to avoid conflict with
libdvdread [now with only libcss with old API (LGB)
2002/Sep/21 Fix a bug which caused segmentation fault when using
-dvdkey option, since css.so was only loaded by -dvdauth.
(LGB, reported and suggested by sbmpost <wortelsapje@hotmail.com>)
Also some cosmetic fix with return value of dvd_css_descramble().
2002/Sep/21 Try to load css syms with AND without underscore at their
names, probably not only OpenBSD requires this so it's a
better solution (LGB).
TODO:
support for libcss libraries with new API */
/* don't do anything with this source if css support was not requested */
#include "config.h"
#ifdef HAVE_LIBCSS
#warning FIXME: Dynamic loading of libcss.so with newer (ver>0.1) libcss API is not supported in this version!
#include <stdio.h>
#include <stdlib.h>
//#include <string.h> // FIXME: conflicts with fs.h
#include <errno.h>
#include <unistd.h>
#include <fcntl.h>
#include <sys/types.h>
#include <sys/ioctl.h>
#include <sys/stat.h>
#include <sys/wait.h>
// #include <css.h>
#if defined(__FreeBSD__) || defined(__NetBSD__)
# include <sys/dvdio.h>
#elif defined(__OpenBSD__)
# include <sys/cdio.h>
# define RTLD_NOW RTLD_LAZY
#elif defined(__linux__)
# include <linux/cdrom.h>
#elif defined(__sun)
# include <sun/dvdio.h>
#elif defined(hpux)
# include <sun/scsi.h>
#elif defined(__bsdi__)
# include <dvd.h>
#else
# error "Need the DVD ioctls"
#endif
#include <dlfcn.h>
#include "dvdauth.h"
// #if OLD_CSS_API
/*
* provide some backward compatibiliy macros to compile this
* code using the old libcss-0.1
*/
#define DVDHandle int
#define DVDOpenFailed (-1)
#define DVDAuth(hdl, s) ioctl(hdl, DVD_AUTH, s)
#define DVDOpenDevice(path) open(path, O_RDONLY)
#define DVDCloseDevice(hdl) close(hdl)
// #define CSSDVDisEncrypted(hdl) CSSisEncrypted(hdl)
// #define CSSDVDAuthDisc CSSAuthDisc
char *dvd_auth_device=NULL;
extern char *dvd_device;
char *dvd_raw_device=NULL;
char *css_so=NULL;
unsigned char key_disc[2048];
unsigned char key_title[5];
unsigned char *dvdimportkey=NULL;
int descrambling=0;
static int css_so_is_loaded=0;
static void *dlid;
static int (*dl_CSSisEncrypted)(int);
static int (*dl_CSSAuthDisc)(int,char *);
static int (*dl_CSSAuthTitle)(int, char *,int);
static int (*dl_CSSGetASF)(int);
static int (*dl_CSSDecryptTitleKey)(char *, char *);
static void (*dl_CSSDescramble)(u_char *, u_char *);
void dvd_css_descramble ( u_char *sec , u_char *key )
{
(*dl_CSSDescramble)(sec,key);
}
#ifdef __linux__
#include <linux/fs.h>
#ifndef FIBMAP
#define FIBMAP 1
#endif
static int path_to_lba (char *path)
{
int lba = 0;
char cmd[100];
FILE *fp;
snprintf(cmd,sizeof(cmd),"fibmap_mplayer %s",path);
fp=popen(cmd,"r");
if (fp) {
int ret;
memset(cmd,0,sizeof(cmd));
fgets(cmd,99,fp);
// printf("DVD: cmd: %s\n",cmd);
if ((ret=pclose(fp)))
fprintf(stderr,"DVD: fibmap_mplayer: %s\n",*cmd?cmd:"no error info");
if (cmd[0]<'0'||cmd[0]>'9') fp=NULL; else {
if(WIFEXITED(ret) && !WEXITSTATUS(ret)) {
lba=atoi(cmd);
printf("DVD: fibmap_mplayer is being used\n");
} else
fp=NULL;
}
}
if (!fp) {
int fd;
printf("DVD: fibmap_mplayer could not run, trying with ioctl() ...\n");
if ((fd = open(path, O_RDONLY)) == -1) {
fprintf(stderr, "DVD: Cannot open file %s: %s",
path ? path : "(NULL)", strerror(errno));
return -1;
}
if (ioctl(fd, FIBMAP, &lba) != 0) {
perror("DVD: ioctl FIBMAP");
fprintf(stderr," Hint: run mplayer as root (or better to install fibmap_mplayer as suid root)!\n");
close(fd);
return -1;
}
close(fd);
}
printf("DVD: LBA: %d\n",lba);
return lba;
}
#else /*linux*/
static int path_to_lba (char *path)
{
#warning translating pathname to iso9660 LBA is not supported on this platform
fprintf(stderr, "DVD: Translating pathname to iso9660 LBA is not supported on this platform\n");
return -1;
}
#endif /*linux*/
static int CSSDVDAuthTitlePath(DVDHandle hdl,unsigned char *key_title,char *path)
{
int lba=path_to_lba(path);
if (lba==-1) return -1;
return (*dl_CSSAuthTitle)(hdl,key_title,lba);
}
static void reset_agids ( DVDHandle dvd )
{
#if !defined(DVD_AUTH) && defined(DVDIOCREPORTKEY)
struct dvd_authinfo ai;
int i;
for (i = 0; i < 4; i++) {
memset(&ai, 0, sizeof(ai));
ai.format = DVD_INVALIDATE_AGID;
ai.agid = i;
ioctl(dvd, DVDIOCREPORTKEY, &ai);
}
#else
#if defined(__OpenBSD__)
union
#endif
dvd_authinfo ai;
int i;
for (i = 0; i < 4; i++) {
memset(&ai, 0, sizeof(ai));
ai.type = DVD_INVALIDATE_AGID;
ai.lsa.agid = i;
DVDAuth(dvd, &ai);
}
#endif
}
static int dvd_load_css_so ( void )
{
if (css_so_is_loaded) {
printf("DVD: warning: attempt to load css.so twice, ignoring.\n");
return 0;
}
if (!css_so) css_so=strdup("libcss.so");
printf("DVD: opening libcss.so as %s ...\n",css_so);
dlid=dlopen(css_so,RTLD_NOW);
if (!dlid) {
printf("DVD: dlopen: %s\n",dlerror());
return 1;
} printf("DVD: dlopen OK!\n");
/* #ifdef __OpenBSD__
#define CSS_DLSYM(v,s) if (!(v=dlsym(dlid,"_" s))) {\
fprintf(stderr,"DVD: %s\n Hint: use libcss version 0.1!\n",dlerror());\
return 1; }
#else
#define CSS_DLSYM(v,s) if (!(v=dlsym(dlid,s))) {\
fprintf(stderr,"DVD: %s\n Hint: use libcss version 0.1!\n",dlerror());\
return 1; }
#endif */
#define CSS_DLSYM(v,s) \
if (!(v=dlsym(dlid,s))) {\
if (!(v=dlsym(dlid,"_" s))) {\
fprintf(stderr,"DVD: %s\n Hint: use libcss version 0.1!\n",dlerror());\
return 1;\
}\
}
CSS_DLSYM(dl_CSSisEncrypted,"CSSisEncrypted");
CSS_DLSYM(dl_CSSAuthDisc,"CSSAuthDisc");
CSS_DLSYM(dl_CSSAuthTitle,"CSSAuthTitle");
CSS_DLSYM(dl_CSSGetASF,"CSSGetASF");
CSS_DLSYM(dl_CSSDecryptTitleKey,"CSSDecryptTitleKey");
CSS_DLSYM(dl_CSSDescramble,"CSSDescramble");
#undef CSS_DLSYM
css_so_is_loaded=1;
printf("DVD: shared object %s is loaded normally.\n",css_so);
return 0;
}
int dvd_import_key ( unsigned char *hexkey )
{
unsigned char *t=key_title;
int digit=4,len;
memset(key_title,0,sizeof(key_title));
// printf("DVD key: %s\n",hexkey);
for (len=0;len<10;len++) {
// printf("-> %c\n",*hexkey);
if (!*hexkey) return 1;
if (*hexkey>='A'&&*hexkey<='F') *t|=(*hexkey-'A'+10)<<digit;
else if (*hexkey>='0'&&*hexkey<='9') *t|=(*hexkey-'0')<<digit;
else return 1;
if (digit) digit=0; else {
digit=4;
t++;
}
hexkey++;
}
if (*hexkey) return 1;
printf("DVD: DVD key (requested): %02X%02X%02X%02X%02X\n",key_title[0],key_title[1],key_title[2],key_title[3],key_title[4]);
if (dvd_load_css_so()) return 1;
descrambling=1;
return 0;
}
int dvd_auth ( char *dev , char *filename )
{
DVDHandle dvd; /* DVD device handle */
if (dvd_load_css_so()) return 1;
if ((dvd=DVDOpenDevice(dev)) == DVDOpenFailed) {
fprintf(stderr,"DVD: cannot open DVD device \"%s\": %s.\n",
dev, strerror(errno));
return 1;
}
if (!(*dl_CSSisEncrypted)(dvd)) {
printf("DVD: DVD is unencrypted! Skipping authentication!\n(note: you should not use dvd:// switch for unencrypted discs!)\n");
DVDCloseDevice(dvd);
return 0;
} else printf("DVD: DVD is encrypted, issuing authentication ...\n");
/* reset AGIDs */
reset_agids(dvd);
/* authenticate disc */
if ((*dl_CSSAuthDisc)(dvd,key_disc)) {
fprintf(stderr,"DVD: CSSDVDAuthDisc() failed.\n");
DVDCloseDevice(dvd);
return 1;
}
if (CSSDVDAuthTitlePath(dvd,key_title,filename)) {
fprintf(stderr,"DVD: CSSDVDAuthTitle() failed.\n");
DVDCloseDevice(dvd);
return 1;
}
/* decrypting title */
if ((*dl_CSSDecryptTitleKey)(key_title, key_disc) < 0) {
fprintf(stderr,"DVD: CSSDecryptTitleKey() failed.\n");
DVDCloseDevice(dvd);
return 1;
}
DVDCloseDevice(dvd);
printf("DVD: DVD title key is: %02X%02X%02X%02X%02X\n",key_title[0],key_title[1],key_title[2],key_title[3],key_title[4]);
descrambling=1;
return 0;
}
#endif
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