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/*
* growisofs 2.1 by Andy Polyakov <appro@fy.chalmers.se>.
*
* Use-it-on-your-own-risk, GPL bless...
*
* This is a front-end to mkisofs(8) which makes it possible to append
* data to isofs volumes residing on random write access media like
* DVD+RW, DVD-RAM, etc. Idea is very simple. Append the new data as it
* were added to a multisession media and then copy the new volume
* descriptor(s) to the beginning of volume thus updating the root
* catalog reference(s)...
*
* For further details see http://fy.chalmers.se/~appro/linux/DVD+RW/.
*
* Revision history:
*
* 1.1:
* - flush cache before copying volume descriptors;
* 2.0:
* - support for /dev/raw*;
* - support for set-root-uid operation (needed for /dev/raw*);
* - support for first "session" burning (needed for "poor-man");
* - "poor-man" support for those who don't want to recompile the
* kernel;
* 2.1:
* - mkisofs_pid typo;
*/
#define _LARGEFILE_SOURCE
#define _LARGEFILE64_SOURCE
#define _FILE_OFFSET_BITS 64
/*
* I fail to understand why do I have to define this. I mean why doesn't
* compiler driver define something of this sort?
*/
#define _GNU_SOURCE
#include <stdio.h>
#include <unistd.h>
#include <stdlib.h>
#include <errno.h>
#include <string.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/ioctl.h>
#include <fcntl.h>
#include <sys/wait.h>
#include <linux/iso_fs.h>
#include <linux/cdrom.h>
#include <sys/mman.h>
#include <linux/raw.h>
#include <signal.h>
#define CD_BLOCK ((off64_t)2048)
#define VOLDESC_OFF 16
#define DVD_BLOCK (32*1024)
static unsigned int from_733 (unsigned char *s)
{ unsigned int ret=0;
ret |= s[0];
ret |= s[1]<<8;
ret |= s[2]<<16;
ret |= s[3]<<24;
return ret;
}
static void to_733 (unsigned char *s,unsigned int val)
{ s[0] = (val) & 0xFF;
s[1] = (val>>8) & 0xFF;
s[2] = (val>>16) & 0xFF;
s[3] = (val>>24) & 0xFF;
s[4] = (val>>24) & 0xFF;
s[5] = (val>>16) & 0xFF;
s[6] = (val>>8) & 0xFF;
s[7] = (val) & 0xFF;
}
char *find_raw_device(int fd, char *device)
{ int i,rawctl,dev_major,dev_minor;
char *ret=NULL;
struct raw_config_request req;
struct stat sb;
static char rawdevname[16] = "";
if (rawdevname[0]) return rawdevname;
if (fstat (fd,&sb) < 0)
perror (":-( unable to fstat"),
exit (1);
if (!S_ISBLK(sb.st_mode)) return NULL;
ret = device;
dev_major = major (sb.st_rdev);
dev_minor = minor (sb.st_rdev);
if ((rawctl=open ("/dev/rawctl",O_RDONLY)) < 0) return ret;
for (i=1;i<256;i++)
{ req.raw_minor = i;
if (ioctl(rawctl,RAW_GETBIND,&req) < 0) break;
if (req.block_major == dev_major && req.block_minor == dev_minor)
{ sprintf (rawdevname,"/dev/raw/raw%d",i);
ret = rawdevname;
break;
}
}
close (rawctl);
return ret;
}
static ssize_t (*pwrite64_method) (int,const void *,size_t,off64_t) = pwrite64;
int media_written = 0, media_fd = -1;
char *media_device;
ssize_t poor_mans_pwrite64 (int fd,const void *buff,size_t size,off64_t foff)
{ struct cdrom_generic_command cgc;
struct request_sense sense;
unsigned int lba;
if (foff&2047 || size&2047) /* 2K block size */
return -1;
lba = foff>>11;
memset (&cgc,0,sizeof(cgc));
cgc.data_direction = CGC_DATA_WRITE;
cgc.buffer = (void *)buff;
cgc.buflen = size;
cgc.sense = &sense;
cgc.cmd[0] = 0x2A; /* WRITE(10) */
cgc.cmd[2] = (lba>>24)&0xff;/* Logical Block Addrss */
cgc.cmd[3] = (lba>>16)&0xff;
cgc.cmd[4] = (lba>>8)&0xff;
cgc.cmd[5] = lba&0xff;
cgc.cmd[7] = (size>>19)&0xff;
cgc.cmd[8] = (size>>11)&0xff;
if (ioctl (fd,CDROM_SEND_PACKET,&cgc))
{ fprintf (stderr,":-[ SENSE KEY=%xh/ASC=%xh/ASCQ=%xh ]\n",
sense.sense_key,sense.asc,sense.ascq);
return -1;
}
media_written = 1;
return size;
}
void poor_mans_finalize ()
{ if (media_written)
{ struct cdrom_generic_command cgc;
fprintf (stderr,"%s: flushing cache\n",media_device);
memset (&cgc,0,sizeof(cgc));
cgc.data_direction = CGC_DATA_NONE;
cgc.cmd[0] = 0x35; /* FLUSH CACHE */
if (ioctl (media_fd,CDROM_SEND_PACKET,&cgc))
perror (":-( unable to FLUSH CACHE");
fprintf (stderr,"%s: stopping de-icing\n",media_device);
memset (&cgc,0,sizeof(cgc));
cgc.data_direction = CGC_DATA_NONE;
cgc.cmd[0] = 0x5B; /* CLOSE TRACK/SESSION */
cgc.cmd[2] = 0; /* "Stop De-Icing" */
if (ioctl (media_fd,CDROM_SEND_PACKET,&cgc))
perror (":-( unable to CLOSE SESSION");
fprintf (stderr,"%s: writing lead-out\n",media_device);
memset (&cgc,0,sizeof(cgc));
cgc.data_direction = CGC_DATA_NONE;
cgc.cmd[0] = 0x5B; /* CLOSE TRACK/SESSION */
cgc.cmd[2] = 0x02; /* "Close session" */
if (ioctl (media_fd,CDROM_SEND_PACKET,&cgc))
perror (":-( unable to CLOSE SESSION");
media_written = 0;
}
_exit (errno);
}
void pipe_it_up (char *mkisofs_argv[],int outfd,off64_t foff)
{ pid_t mkisofs_pid,pid;
int fildes[2],ret,n,off;
char *buffer;
buffer = mmap (NULL,DVD_BLOCK,PROT_READ|PROT_WRITE,
MAP_PRIVATE|MAP_ANONYMOUS,-1,0);
if (buffer == MAP_FAILED)
fprintf (stderr,"unable to anonymously mmap %d?\n",DVD_BLOCK),
exit(1);
if (pipe (fildes) < 0)
perror (":-( unable to create pipe"), exit(1);
if ((mkisofs_pid=fork ()) == -1)
perror (":-( unable to fork mkisofs"), exit(1);
else if (mkisofs_pid == 0)
{ dup2 (fildes[1],1);
close (fildes[0]);
close (fildes[1]);
close (outfd);
execvp ("mkisofs",mkisofs_argv);
perror (":-( unable to execute mkisofs"), exit (1);
}
close (fildes[1]);
off = 0;
while ((n=read (fildes[0],buffer+off,DVD_BLOCK-off)) > 0)
{ off += n;
if (off == DVD_BLOCK)
{ off = 0;
if ((n=(*pwrite64_method) (outfd,buffer,DVD_BLOCK,foff))
!= DVD_BLOCK)
{ if (n>0) errno = EIO;
else if (n==0) errno = ENOSPC;
n = -1;
break;
}
foff += DVD_BLOCK;
}
}
if (off)
{ memset (buffer+off,0,DVD_BLOCK-off);
if ((*pwrite64_method) (outfd,buffer,DVD_BLOCK,foff) != DVD_BLOCK)
{ if (n>0) errno = EIO;
else if (n==0) errno = ENOSPC;
n = -1;
}
foff += DVD_BLOCK;
}
if (n==0) /* mkisofs must have finished, consume the exit code */
{ if ((waitpid (mkisofs_pid,&ret,0)) == -1)
perror (":-( waitpid failed"), exit (1);
if (!WIFEXITED(ret) || WEXITSTATUS(ret)!=0)
fprintf (stderr,":-( mkisofs failed: %d\n",errno=ret), exit (1);
}
else if (n<0)
{ perror (":-( write failed"), exit (1); }
munmap (buffer,DVD_BLOCK);
}
#define MAX_IVDs 4
#define IVDs_SIZE (sizeof(struct iso_primary_descriptor)*MAX_IVDs)
int main (int argc, char *argv[])
{ int infd,outfd;
char *in_device,*out_device;
char dev_found;
int i,dry_run=0,poor_man=0,warn_for_isofs=0;
char **mkisofs_argv,C_parm[16],M_parm[16];
int mkisofs_argc;
unsigned int next_session,new_size;
struct iso_primary_descriptor *buffer;
uid_t uid=getuid();
/* mmap buffer so that we can use it with /dev/raw/rawN */
buffer = mmap (NULL,2*IVDs_SIZE,PROT_READ|PROT_WRITE,MAP_PRIVATE|MAP_ANON,-1,0);
if (buffer == MAP_FAILED)
fprintf (stderr,":-( unable to anonymously mmap %d: ",2*IVDs_SIZE),
perror (NULL), exit (1);
mkisofs_argv = malloc ((argc+3)*sizeof(char *));
if (mkisofs_argv == NULL)
fprintf (stderr,":-( unable to allocate %d: ",(argc+3)*sizeof(char *)),
perror (NULL), exit (1);
mkisofs_argv[0] = "mkisofs", mkisofs_argc = 1;
for (i=1;i<argc;i++)
{ int len=strlen(argv[i]);
dev_found = '\0';
if (argv[i][0] == '-')
{ if (argv[i][1] == 'M')
{ if (len > 2) in_device = argv[i]+2;
else in_device = argv[++i];
dev_found = 'M';
}
else if (!strncmp(argv[i],"-prev-session",13))
{ if (len > 13) in_device = argv[i]+13;
else in_device = argv[++i];
dev_found = 'M';
}
else if (argv[i][1] == 'Z')
{ if (len > 2) in_device = argv[i]+2;
else in_device = argv[++i];
dev_found = 'Z';
}
else if (!strncmp(argv[i],"-zero-session",13))
{ if (len > 13) in_device = argv[i]+13;
else in_device = argv[++i];
dev_found = 'Z';
}
else if (!strcmp(argv[i],"-poor-man"))
{ poor_man = 1;
continue;
}
else if (argv[i][1] == 'C' || !strncmp(argv[i],"-cdrecord-params",16))
continue;
else if (argv[i][1] == '#' || !strcmp(argv[i],"-dry-run"))
{ dry_run = 1;
continue;
}
else if (strstr (argv[i],"-version"))
{ printf ("growisofs 2.1, front-ending to ");
fflush (stdout);
execlp ("mkisofs","mkisofs","-version",NULL);
perror (":-( unable to execute mkisofs");
exit (1);
}
}
if (dev_found)
{ if (*in_device == '=') in_device++;
/*
* I ignore return values from set{re}uid calls because if
* they fail we have no privileges to care about and should
* just proceed anyway...
*/
setreuid (-1,uid); /* get real, but preserve saved uid */
if ((infd = open64 (in_device,O_RDONLY)) < 0)
fprintf (stderr,":-( unable to open64(\"%s\",O_RDONLY): ",
in_device),
perror (NULL), exit (1);
setreuid(-1,0); /* get root for a /dev/raw sake */
out_device=find_raw_device (infd,in_device);
if (out_device) /* original block device or /dev/raw */
{ if (out_device == in_device) setuid (uid);
if ((outfd=open64 (out_device,O_RDWR)) < 0)
{ if (errno == EROFS) /* must be unpatched kernel */
{ out_device=in_device, outfd=dup(infd), poor_man=1; }
else
{ fprintf (stderr,":-( unable to open64(\"%s\",O_RDWR): ",
out_device),
perror (NULL), exit (1);
}
}
setuid (uid); /* drop all privileges */
}
else
{ setuid (uid); /* drop all privileges */
out_device=in_device;
if ((outfd=open64 (out_device,O_RDWR)) < 0)
{ fprintf (stderr,":-( unable to open64(\"%s\",O_RDWR): ",
in_device),
perror (NULL), exit (1);
}
}
if (pread64 (infd,buffer,IVDs_SIZE,VOLDESC_OFF*CD_BLOCK) != IVDs_SIZE
&& dev_found == 'M')
perror (":-( unable to pread64(2) primary volume descriptors"),
exit (1);
if (dev_found == 'M')
{ if (memcmp (buffer,"\1CD001",5))
fprintf (stderr,":-( %s doesn't look like isofs...\n",
in_device), exit(1);
next_session = from_733(buffer->volume_space_size);
/* pad to closest 32K boundary for optimal performance */
next_session += 15;
next_session /= 16;
next_session *= 16;
sprintf (C_parm,"16,%u",next_session);
mkisofs_argv[mkisofs_argc++] = "-C";
mkisofs_argv[mkisofs_argc++] = C_parm;
sprintf (M_parm,"/dev/fd/%d",infd);
mkisofs_argv[mkisofs_argc++] = "-M";
mkisofs_argv[mkisofs_argc++] = M_parm;
len = 3 + strlen(C_parm) + 3 + strlen(M_parm);
}
else
{ if (!memcmp (buffer,"\1CD001",5))
warn_for_isofs = 1;
next_session = 0;
continue;
}
}
else
{ mkisofs_argv[mkisofs_argc++] = argv[i]; }
}
if (in_device == NULL)
fprintf (stderr,"%s: previous \"session\" device is not specified, "
"do use -M or -Z option\n",argv[0]),
exit (1);
/*
* If we passed the statement above, then we should know that all
* privileges were dropped when we were working on -[MZ] options.
*/
mkisofs_argv[mkisofs_argc] = NULL;
if (warn_for_isofs)
fprintf (stderr,"WARNING: %s already carries isofs!\n",out_device),
printf ("About to execute '");
else
printf ("Executing '");
for (i=0;i<mkisofs_argc;i++) printf ("%s ",mkisofs_argv[i]);
printf ("| dd of=%s obs=32k seek=%u'\n",
poor_man?in_device:out_device,next_session/16);
fflush (stdout);
if (dry_run) close (infd), close (outfd), exit (0);
if (poor_man)
{ struct cdrom_generic_command cgc;
unsigned char buf[8];
media_fd = dup2 (infd,outfd);
media_device=out_device=in_device;
memset (&cgc,0,sizeof(cgc));
cgc.buffer = buf;
cgc.buflen = 8;
cgc.data_direction = CGC_DATA_READ;
cgc.cmd[0] = 0x46; /* GET CONFIGURATION */
cgc.cmd[8] = 8;
if (ioctl (infd,CDROM_SEND_PACKET,&cgc))
perror (":-( unable to GET CONFIGURATION"),
exit (1);
if ((buf[6]<<8|buf[7]) != 0x1A)
fprintf (stderr, ":-( %s: mounted media doesn't appear to be DVD+RW\n",out_device),
exit (1);
pwrite64_method = poor_mans_pwrite64;
atexit (poor_mans_finalize);
signal (SIGHUP,poor_mans_finalize);
signal (SIGINT,poor_mans_finalize);
signal (SIGTERM,poor_mans_finalize);
signal (SIGPIPE,poor_mans_finalize);
}
if (warn_for_isofs) fprintf (stderr,"Sleeping for 5 sec...\n"), sleep (5);
pipe_it_up (mkisofs_argv,outfd,next_session*CD_BLOCK);
if (next_session!=0)
{ struct cdrom_generic_command cgc;
/*
* (At least) hp100i needs cache flush in order to proceed with
* read at this point. This is being moved to kernel, but it won't
* ever harm to do this from user-land.
*/
fprintf (stderr,"%s: flushing cache\n",in_device);
memset (&cgc,0,sizeof(cgc));
cgc.data_direction = CGC_DATA_NONE;
cgc.cmd[0] = 0x35; /* FLUSH CACHE */
ioctl (infd,CDROM_SEND_PACKET,&cgc);
fprintf (stderr,"%s: copying volume descriptor(s)\n",out_device);
if (pread64 (outfd,buffer+MAX_IVDs,IVDs_SIZE,
(next_session+VOLDESC_OFF)*CD_BLOCK) != IVDs_SIZE)
perror (":-( unable to pread64(2) primary volume descriptors"),
exit (1);
if (memcmp (buffer+MAX_IVDs,"\1CD001",5))
fprintf (stderr,":-( %s:%d doesn't look like isofs!\n",
out_device,next_session),
errno = EINVAL,
exit (1);
new_size = from_733(buffer[MAX_IVDs].volume_space_size) + next_session;
to_733(buffer[MAX_IVDs].volume_space_size,new_size);
if ((*pwrite64_method) (outfd,buffer+MAX_IVDs,sizeof(*buffer),
VOLDESC_OFF*CD_BLOCK) != sizeof(*buffer))
perror (":-( unable to pwrite64(2) primary volume descriptor"),
exit (1);
/*
* copy secondary volume descriptor(s) which are expected to
* appear in the very same order
*/
for (i=1;i<4;i++)
{ if (buffer[i].type[0] == (char)ISO_VD_END) break;
if (memcmp (buffer[i].id,"CD001",4)) break;
if (buffer[i].type[0] != buffer[4+i].type[0])
{ fprintf (stderr,"volume descriptor mismatch, did you "
"use same mkisofs options?\n");
break;
}
to_733(buffer[4+i].volume_space_size,new_size);
if ((*pwrite64_method)(outfd,buffer+MAX_IVDs+i,sizeof(*buffer),
(VOLDESC_OFF+i)*CD_BLOCK) != sizeof(*buffer))
perror (":-( unable to pwrite64(2) volume descriptor"),
exit (1);
}
}
errno = 0;
exit (0);
}
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