End user forums for VirtualBox
by h2o » 10. Feb 2009, 06:50
by h2o » 10. Feb 2009, 06:51
/* Original author: h2o on forums.virtualbox.org *
* http://forums.virtualbox.org/viewtopic.php?p=59275 *
* vdimount.c - tool for mounting VDI files */
/* *
* Available compile flags: *
* -DNO_VBOX_HDRS: don't use the VBox headers *
* (useful if you don't have them) *
* -DOLDAPI: use old VBoxHDD.h api (default uses VBoxHDD-new.h) *
* */
/* This program is free software: you can redistribute it and/or modify *
* it under the terms of the GNU General Public License as published by *
* the Free Software Foundation, either version 3 of the License, or *
* (at your option) any later version. *
* *
* This program is distributed in the hope that it will be useful, *
* but WITHOUT ANY WARRANTY; without even the implied warranty of *
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
* GNU General Public License for more details. *
* *
* You should have received a copy of the GNU General Public License *
* along with this program. If not, see <http://www.gnu.org/licenses/>. */
#include <unistd.h>
#include <stdlib.h>
#include <stdio.h>
#include <stdint.h>
#include <stdarg.h>
#include <fcntl.h>
#include <string.h>
#include <signal.h>
#include <endian.h>
#include <errno.h>
#include <pthread.h>
#include <linux/nbd.h>
#include <sys/poll.h>
#include <sys/socket.h>
#include <netinet/in.h>
#warning "This program is obsolete, use the fuse-based version (vdfuse) instead"
#ifdef __GNUC__
#define UNUSED __attribute__ ((unused))
#else
#define UNUSED
#endif
// macro to convert uint64_t's to network order
#if __BYTE_ORDER == __LITTLE_ENDIAN
#define ntohll __bswap_64
#else
#define ntohll
#endif
#define htonll ntohll
#ifdef NO_VBOX_HDRS
#define VBOX_SUCCESS(i) (__builtin_expect (i >= 0, 1))
#define VBOX_FAILURE(i) (!VBOX_SUCCESS (i))
#endif
#ifdef OLDAPI
#ifdef NO_VBOX_HDRS
// from VBoxHDD.h
// (P)VDIDISK
struct VDIDISK;
typedef struct VDIDISK VDIDISK;
typedef VDIDISK *PVDIDISK;
// Flags
#define VDI_OPEN_FLAGS_NORMAL (0)
#define VDI_OPEN_FLAGS_READONLY (1)
// Functions
extern PVDIDISK VDIDiskCreate (void);
extern int VDIDiskOpenImage (PVDIDISK, const char *, unsigned);
extern void VDIDiskCloseImage (PVDIDISK);
extern int VDIDiskRead (PVDIDISK, uint64_t, void *, size_t);
extern int VDIDiskWrite (PVDIDISK, uint64_t, const void *, size_t);
extern uint64_t VDIDiskGetSize (PVDIDISK);
#else // NO_VBOX_HDRS
#define IN_RING3
#include <VBox/VBoxHDD.h>
#endif // NO_VBOX_HDRS
#else // OLDAPI
#ifdef NO_VBOX_HDRS
// from VBoxHDD-new.h
// VDINTERFACETYPE
typedef enum VDINTERFACETYPE
{
VDINTERFACETYPE_FIRST = 0,
VDINTERFACETYPE_ERROR = VDINTERFACETYPE_FIRST,
VDINTERFACETYPE_ASYNCIO,
VDINTERFACETYPE_PROGRESS,
VDINTERFACETYPE_CONFIG,
VDINTERFACETYPE_INVALID
} VDINTERFACETYPE;
// (P)VDINTERFACE
typedef struct VDINTERFACE
{
const char *pszInterfaceName;
uint32_t cbSize;
struct VDINTERFACE *pNext;
VDINTERFACETYPE enmInterface;
void *pvUser;
void *pCallbacks;
} VDINTERFACE, *PVDINTERFACE;
// (P)VBOXHDD
struct VBOXHDD;
typedef struct VBOXHDD VBOXHDD;
typedef VBOXHDD *PVBOXHDD;
// Flags
#define VD_OPEN_FLAGS_NORMAL 0
#define VD_OPEN_FLAGS_READONLY 1
// Functions
extern int VDCreate(PVDINTERFACE, PVBOXHDD *);
extern int VDOpen(PVBOXHDD, const char *, const char *, unsigned, PVDINTERFACE);
extern uint64_t VDGetSize(PVBOXHDD, unsigned);
extern int VDRead(PVBOXHDD, uint64_t, void *, size_t);
extern int VDWrite(PVBOXHDD, uint64_t, const void *, size_t);
extern int VDClose(PVBOXHDD, int /* should be bool */);
#else // NO_VBOX_HDRS
#define IN_RING3
#include <VBox/VBoxHDD-new.h>
#endif // NO_VBOX_HDRS
#endif // OLDAPI
#define SINSIZE sizeof (struct sockaddr_in)
// taken from cliserv.h in nbd package
#define INIT_PASSWD "NBDMAGIC"
#define BUFSIZE 1048576
#define NBD_FLAG_HAS_FLAGS (1)
#define NBD_FLAG_READ_ONLY (2)
uint64_t clientmagic = 0x00420281861253LL;
typedef struct
{
int pn; // partition #
int port; // port #
int sock; // socket #
struct sockaddr_in sin;
uint64_t offset; // offset into disk
uint64_t size; // size of partiton
} abinding;
// MBR entry structure
struct mbri
{
uint8_t status;
uint8_t shead;
uint8_t ssector;
uint8_t sbits;
uint8_t type;
uint8_t ehead;
uint8_t esector;
uint8_t ebits;
uint32_t offset;
uint32_t size;
};
// own implementation of GList from GLib
typedef struct _dlist dlist;
struct _dlist
{
void *data;
dlist *next;
dlist *prev;
};
// struct to pass args to server thread
struct serverarg
{
dlist *dl;
abinding *bn;
};
struct sigaction siga;
void *server_main (void *);
void cleanup (int);
void start_server (int);
int vread (abinding *, uint64_t, uint32_t, void *);
int vwrite (abinding *, uint64_t, uint32_t, const void *);
void timeout (int);
dlist *list_start (dlist *list)
{
while (list && list->prev)
list = list->prev;
return list;
}
dlist *list_end (dlist *list)
{
while (list && list->next)
list = list->next;
return list;
}
int list_len (dlist *list)
{
int i = 0;
list = list_start (list);
do
{
i++;
}
while (list && (list = list->next));
return i;
}
dlist *list_add (dlist *list, void *data)
{
if (list)
list = list_end (list);
dlist *newlist = malloc (sizeof (dlist));
newlist->data = data;
newlist->next = NULL;
newlist->prev = list;
if (list)
list->next = newlist;
return list_start (newlist);
}
dlist *list_del (dlist *item)
{
dlist *next = item->next;
dlist *prev = item->prev;
if (next)
next->prev = prev;
if (prev)
prev->next = next;
free (item);
if (next)
return list_start (next);
else if (prev)
return list_start (prev);
else
return NULL;
}
// printf to stderr
const char *errout_pre = "ERROR: ";
void errout (const char *format, ...)
{
char *tmpfmt = malloc (strlen (errout_pre) + strlen (format) + 2);
strcpy (tmpfmt, errout_pre);
strcat (tmpfmt, format);
strcat (tmpfmt, "\n");
va_list ap;
va_start (ap, format);
vfprintf (stderr, tmpfmt, ap);
va_end (ap);
free (tmpfmt);
fflush (stderr);
}
int verbose = 0;
// verbose printf
void vbprintf (const char *format, ...)
{
if (!verbose)
return;
va_list ap;
va_start (ap, format);
vprintf (format, ap);
va_end (ap);
fflush (stdout);
}
dlist *maplist;
dlist *thrs;
#ifdef OLDAPI
PVDIDISK vdidisk;
#else
VDINTERFACE dInterface;
PVBOXHDD dDisk;
#endif
int readonly;
#define BLOCKSIZE 512
pthread_mutex_t disk_mutex = PTHREAD_MUTEX_INITIALIZER;
pthread_cond_t sock_cond = PTHREAD_COND_INITIALIZER;
pthread_mutex_t sock_mutex = PTHREAD_MUTEX_INITIALIZER;
struct sigaction blocksig;
struct sigaction freesig;
// valid backends
char *validBackends[] = {"VDI", "VMDK", "VHD", "raw"};
// adds partition->port mapping
int add_map (char *v)
{
char *eqi = strchr (v, '=');
if (!eqi)
{
errout ("invalid argument \"%s\"", v);
return -1;
}
char *pn = v;
char *port = eqi + 1;
*eqi = 0;
int pni;
if (strcmp (pn, "raw") == 0)
pni = -1;
else
pni = strtol (pn, 0, 10);
int porti = strtol (port, 0, 10);
if (pni == 0 || porti == 0)
{
errout ("invalid partition number %d or port number %d", pni, porti);
return -1;
}
abinding *binding = malloc (sizeof (abinding));
binding->pn = pni;
binding->port = porti;
maplist = list_add (maplist, binding);
return 0;
}
// processes logical partitions (does this work???)
int pnse (uint64_t offset)
{
int pn = 5;
while (offset)
{
char buf[512];
#ifdef OLDAPI
VDIDiskRead (vdidisk, offset, buf, 512);
#else
VDRead (dDisk, offset, buf, 512);
#endif
struct mbri *entry_a = (struct mbri *)(buf + 446);
struct mbri *entry_b = (struct mbri *)(buf + 462);
uint16_t *sig = (uint16_t *)(buf + 510);
if (*sig != 0xaa55)
{
errout ("invalid ebr signature at offset %llx", offset);
return -1;
}
uint64_t offset64 = (uint64_t)entry_a->offset;
offset64 *= BLOCKSIZE;
uint64_t size64 = (uint64_t)entry_a->size;
size64 *= BLOCKSIZE;
dlist *mm = maplist;
while (mm)
{
abinding *bn = mm->data;
if (bn->pn == pn)
{
bn->offset = offset64;
bn->size = size64;
}
mm = mm->next;
}
offset = entry_b->offset;
pn++;
}
return 0;
}
// processes partiton table
int pns ()
{
char dmbr[512];
#ifdef OLDAPI
VDIDiskRead (vdidisk, 0, dmbr, 512);
#else
VDRead (dDisk, 0, dmbr, 512);
#endif
struct mbri *pts = (struct mbri *)(dmbr + 446);
uint16_t *sig;
sig = (uint16_t *)(dmbr + 510);
if (*sig != 0xaa55)
{
errout ("invalid mbr signature");
return -1;
}
int i = 0;
dlist *mm = maplist;
abinding *bn;
while (i < 4)
{
int pn = i + 1;
uint64_t offset64 = (uint64_t)pts[i].offset;
offset64 *= BLOCKSIZE;
uint64_t size64 = (uint64_t)pts[i].size;
size64 *= BLOCKSIZE;
while (mm)
{
bn = mm->data;
if (bn->pn == pn)
{
bn->offset = offset64;
bn->size = size64;
}
mm = mm->next;
}
if (pts[i].type == 5)
{
uint64_t extpart = (uint64_t) pts[i].offset;
extpart = extpart * BLOCKSIZE;
if (pnse (extpart) < 0)
return -1;
}
i++;
}
mm = maplist;
while (mm)
{
bn = mm->data;
if (bn->pn == -1)
{
bn->offset = 0;
#ifdef OLDAPI
bn->size = VDIDiskGetSize (vdidisk);
#else
bn->size = VDGetSize (dDisk, 0);
#endif
break;
}
mm = mm->next;
}
return 0;
}
int main (int c, char **v)
{
if (c < 4)
{
printf ("Usage: %s [-r] [-v] [-d] [-t type] -f image-file partiton-number=port-number "
"[partition-#=port-#] [...]\n"
"\t-r readonly\n"
"\t-f path to image file\n"
"\t-d daemonize\n"
#ifndef OLDAPI
"\t-t image type (VDI, VMDK, VHD, raw) (default: VDI)\n"
#endif
"\t-v verbose\n"
"To use the entire disk use \"raw\" as the partition number.\n\n"
"Partition 1 is first partiton; partition 5 is first logical partition.\n"
"Example:\tMap partition 1 to port 2001, partition 2 to port 2002:\n"
"\t%s -f /path/to/image/file 1=2001 2=2002\n", v[0], v[0]);
return 255;
}
char *imagefilename = NULL;
#ifndef OLDAPI
char *diskType = "VDI";
#endif
// parse args
int dofork = 0;
v++;
while (*v)
{
if (strcmp (*v, "-r") == 0)
readonly = 1;
else if (strcmp (*v, "-f") == 0)
imagefilename = *++v;
else if (strcmp (*v, "-d") == 0)
dofork = 1;
else if (strcmp (*v, "-v") == 0)
verbose = 1;
#ifndef OLDAPI
else if (strcmp (*v, "-t") == 0)
diskType = *++v;
#endif
else
{
if (add_map (*v) < 0)
return 1;
}
v++;
}
if (!maplist)
{
errout ("no partion->port mappings specified");
return 1;
}
if (!imagefilename)
{
errout ("no image file specified");
return 1;
}
#ifndef OLDAPI
unsigned int di = 0;
int invalidBackend = 1;
while (di < (sizeof (validBackends) / sizeof (char *)))
{
if (strcmp (validBackends[di], diskType) == 0)
{
invalidBackend = 0;
break;
}
di++;
}
if (invalidBackend)
{
errout ("invalid disk type specified, valid types are VDI, VMDK, VHD, and raw.");
return 1;
}
#endif
// open disk
#ifdef OLDAPI
vdidisk = VDIDiskCreate ();
int imageopen = VDI_OPEN_FLAGS_NORMAL;
if (readonly)
imageopen = VDI_OPEN_FLAGS_READONLY;
int ret = VDIDiskOpenImage (vdidisk, imagefilename, imageopen);
#else
dInterface.pszInterfaceName = "What's an interface?";
dInterface.enmInterface = VDINTERFACETYPE_FIRST;
VDCreate (&dInterface, &dDisk);
int imageopen = VD_OPEN_FLAGS_NORMAL;
if (readonly)
imageopen = VD_OPEN_FLAGS_READONLY;
int ret = VDOpen (dDisk, diskType, imagefilename, imageopen, &dInterface);
#endif
if (VBOX_FAILURE (ret))
{
errout ("opening vbox image failed, errno %d", ret);
return 1;
}
vbprintf ("image opened\n");
if (pns () < 0)
return 1;
// setup poll structures
struct pollfd *pfd = malloc (list_len (maplist) * sizeof (struct pollfd));
int pfdl = 0;
// bind / listen sockets
dlist *mm = maplist;
int i = 0;
while (mm)
{
abinding *bn = mm->data;
bn->sock = socket (AF_INET, SOCK_STREAM, 0);
pfd[pfdl].fd = bn->sock;
pfd[pfdl].events = POLLIN;
pfdl++;
memset (&bn->sin, 0, SINSIZE);
bn->sin.sin_family = AF_INET;
bn->sin.sin_port = htons (bn->port);
bn->sin.sin_addr.s_addr = htonl (0x7f000001); /* 127.0.0.1 */
ret = bind (bn->sock, (struct sockaddr *)&bn->sin, SINSIZE);
if (ret < 0)
{
errout ("Failed binding socket: %m", errno);
return 1;
}
listen (bn->sock, 1024);
vbprintf ("Binding %d:\n\tPartition #: %d\n\tPort: %d\n\tOffset: %lld\n\tSize: %lld\n\n", i++, bn->pn, bn->port, bn->offset, bn->size);
if (!bn->size)
{
errout ("Size of binding %d is zero, either partition %d does not exist, or the partition table is corrupt/not valid.", i, bn->pn);
return 1;
}
mm = mm->next;
}
siga.sa_handler = cleanup;
sigfillset (&siga.sa_mask);
siga.sa_flags = 0;
sigaction (SIGTERM, &siga, 0);
sigaction (SIGINT, &siga, 0);
blocksig.sa_handler = SIG_IGN;
// daemonize
if (dofork)
{
verbose = 0;
int forkrc = fork ();
if (forkrc < 0)
errout ("failed to daemonize: %m", errno);
else if (forkrc)
return 0;
else
{
int devnull = open ("/dev/null", O_RDWR);
dup2 (devnull, 0);
dup2 (devnull, 1);
dup2 (devnull, 2);
close (devnull);
}
}
// MAIN LOOP
int po;
while (1)
{
po = poll (pfd, pfdl, 1000);
if (po > 0)
{
i = 0;
while (i < pfdl)
{
if (pfd[i].revents & POLLIN)
{
pthread_mutex_lock (&sock_mutex);
start_server (pfd[i].fd);
// Keep from starting multiple threads for one connection
pthread_cond_wait (&sock_cond, &sock_mutex);
pthread_mutex_unlock (&sock_mutex);
}
i++;
}
}
}
}
void start_server (int fd)
{
dlist *mm = maplist;
abinding *bn;
int notfound = 1;
while (mm)
{
bn = mm->data;
if (bn->sock == fd)
{
notfound = 0;
break;
}
mm = mm->next;
}
if (notfound)
return;
vbprintf ("starting server for partition #%d\n", bn->pn);
pthread_t *thr = malloc (sizeof (pthread_t));
thrs = list_add (thrs, thr);
struct serverarg *sarg = malloc (sizeof (struct serverarg));
sarg->dl = list_end (thrs);
sarg->bn = bn;
pthread_create (thr, NULL, server_main, (void *)sarg);
}
// SIGPIPE-safe write
int swrite (int fd, const void *buf, int count)
{
sigaction (SIGPIPE, &blocksig, &freesig);
int ret = write (fd, buf, count);
int oerrno = errno;
sigaction (SIGPIPE, &freesig, &blocksig);
errno = oerrno;
return ret;
}
// negotiate function (taken from nbd-server)
int negotiate (int fd, abinding *bn)
{
sigaction (SIGPIPE, &blocksig, &freesig);
if (write (fd, INIT_PASSWD, 8) < 0)
{
errout ("negotiate: cannot write INIT_PASSWD: %m", errno);
return -1;
}
uint64_t clientmagicout = htonll (clientmagic);
if (write (fd, &clientmagicout, sizeof (clientmagic)) < 0)
{
errout ("negotiate: cannot write clientmagic: %m", errno);
return -1;
}
uint64_t sizeout = htonll (bn->size);
if (write (fd, &sizeout, sizeof (sizeout)) < 0)
{
errout ("negotiate: cannot write size: %m", errno);
return -1;
}
uint32_t flags = NBD_FLAG_HAS_FLAGS;
if (readonly)
flags |= NBD_FLAG_READ_ONLY;
flags = htonl (flags);
if (write (fd, &flags, sizeof (flags)) < 0)
{
errout ("negotiate: cannot write flags: %m", errno);
return -1;
}
char *nas[124];
memset (nas, 0, 124);
if (write (fd, nas, 124) < 0)
{
errout ("negotiate: cannot write zeroes: %m", errno);
return -1;
}
sigaction (SIGPIPE, &freesig, &blocksig);
return 0;
}
// macro for sending error packet
#define SERR(fd,reply,code) \
{ \
reply.error = htonl (code); \
swrite (fd, &reply, sizeof (reply)); \
reply.error = 0; \
if (errno == EPIPE) \
break;\
}
void *server_main (void *sarg)
{
struct serverarg *sargs = sarg;
abinding *bn = sargs->bn;
pthread_mutex_lock (&sock_mutex);
int mycon = accept (bn->sock, 0, 0);
pthread_cond_broadcast (&sock_cond);
pthread_mutex_unlock (&sock_mutex);
if (mycon < 0)
{
errout ("failed to accept connection on socket %d: %m", bn->sock, errno);
goto out;
}
struct nbd_request request;
struct nbd_reply reply;
if (negotiate (mycon, bn) < 0)
goto out;
reply.magic = htonl (NBD_REPLY_MAGIC);
reply.error = 0;
while (1)
{
char buf[BUFSIZE];
int reqread = read (mycon, &request, sizeof (request));
if (reqread < 0)
goto out;
else if (reqread != sizeof (request))
{
errout ("bad packet: packet is %d bytes instead of %d", reqread, sizeof (request));
SERR (mycon, reply, EINVAL);
continue;
}
request.magic = ntohl (request.magic);
request.type = ntohl (request.type);
request.from = ntohll (request.from);
request.len = ntohl (request.len);
if (request.type == NBD_CMD_DISC)
{
vbprintf ("got disconnect command\n");
break;
}
if (request.magic != NBD_REQUEST_MAGIC)
{
errout ("invalid request magic");
SERR (mycon, reply, EINVAL);
continue;
}
if (request.len > BUFSIZE + sizeof (reply))
{
errout ("request too big");
SERR (mycon, reply, ENOBUFS);
continue;
}
memcpy (reply.handle, request.handle, sizeof (reply.handle));
if (request.from + request.len > bn->offset + bn->size)
{
errout ("request beyond end of device");
SERR (mycon, reply, EINVAL);
continue;
}
if (request.type == NBD_CMD_WRITE)
{
vbprintf ("got write command to write %d bytes at offset %lld on partition %d\n", request.len, request.from, bn->pn);
if (readonly)
{
errout ("attempted write on readonly map");
SERR (mycon, reply, EPERM);
continue;
}
struct pollfd pfd;
pfd.fd = mycon;
pfd.events = POLLIN;
if (poll (&pfd, 1, 5000) == 0)
{
errout ("read data timed out");
SERR (mycon, reply, ETIMEDOUT);
continue;
}
read (mycon, buf, request.len);
if (vwrite (bn, request.from, request.len, buf) < 0)
{
errout ("problem writing to disk");
SERR (mycon, reply, EIO);
continue;
}
swrite (mycon, &reply, sizeof (reply));
continue;
}
else if (request.type == NBD_CMD_READ)
{
vbprintf ("got read command to read %d bytes at offset %lld on partition %d\n", request.len, request.from, bn->pn);
if (vread (bn, request.from, request.len, buf + sizeof (reply)) < 0)
{
errout ("problem reading from disk");
SERR (mycon, reply, EIO);
continue;
}
memcpy (buf, &reply, sizeof (reply));
swrite (mycon, buf, request.len + sizeof (reply));
continue;
}
else
{
errout ("invalid command");
SERR (mycon, reply, EINVAL);
continue;
}
}
out:
close (mycon);
free (sargs->dl->data); // free pthread_t
thrs = list_del (sargs->dl); // free list item
free (sarg); // free server args
vbprintf ("closing server for partition #%d\n", bn->pn);
pthread_exit (0);
}
int vread (abinding *bn, uint64_t from, uint32_t len, void *buf)
{
pthread_mutex_lock (&disk_mutex);
#ifdef OLDAPI
int ret = VDIDiskRead (vdidisk, from + bn->offset, buf, len);
#else
int ret = VDRead (dDisk, from + bn->offset, buf, len);
#endif
pthread_mutex_unlock (&disk_mutex);
if (VBOX_SUCCESS (ret))
return 0;
else
return -1;
}
int vwrite (abinding *bn, uint64_t from, uint32_t len, const void *buf)
{
pthread_mutex_lock (&disk_mutex);
#ifdef OLDAPI
int ret = VDIDiskWrite (vdidisk, from + bn->offset, buf, len);
#else
int ret = VDWrite (dDisk, from + bn->offset, buf, len);
#endif
pthread_mutex_unlock (&disk_mutex);
if (VBOX_SUCCESS (ret))
return 0;
else
return -1;
}
// called on SIGINT / SIGTERM
void cleanup (int s UNUSED)
{
#ifdef OLDAPI
VDIDiskCloseImage (vdidisk);
#else
VDClose (dDisk, 0);
#endif
dlist *mm = maplist;
while (mm)
{
abinding *bn = mm->data;
close (bn->sock);
mm = mm->next;
}
exit (0);
}by TerryE » 10. Feb 2009, 18:06
by echo6 » 10. Feb 2009, 22:52
I reposted the above code 
/tmp/ccjtlwWP.o: In function `pnse':
vdimount.c:(.text+0x3ba): undefined reference to `VDIDiskRead'
/tmp/ccjtlwWP.o: In function `pns':
vdimount.c:(.text+0x5ac): undefined reference to `VDIDiskRead'
vdimount.c:(.text+0x7ee): undefined reference to `VDIDiskGetSize'
/tmp/ccjtlwWP.o: In function `main':
vdimount.c:(.text+0x9c3): undefined reference to `VDIDiskCreate'
vdimount.c:(.text+0x9fb): undefined reference to `VDIDiskOpenImage'
/tmp/ccjtlwWP.o: In function `vread':
vdimount.c:(.text+0x18e6): undefined reference to `VDIDiskRead'
/tmp/ccjtlwWP.o: In function `vwrite':
vdimount.c:(.text+0x1970): undefined reference to `VDIDiskWrite'
/tmp/ccjtlwWP.o: In function `cleanup':
vdimount.c:(.text+0x19b7): undefined reference to `VDIDiskCloseImage'
collect2: ld returned 1 exit statusby TerryE » 10. Feb 2009, 23:32
echo6 wrote:I get the following errors when trying to compile...
by h2o » 11. Feb 2009, 02:38
TerryE wrote:This defines new entries and API so, for example, VDIDiskRead has been replaced by VDRead. The main difference with the VD* routines is that they work on all supported image formats (VDI, VMDK, raw VMDK, VHD).
TerryE wrote:Two niggles: (i) I see you belong to the school of programming: documentation and comments are for wusses; and (ii) I am not sure why you bother to code up your own list processing routines rather than just use the standard STL ones.
by h2o » 11. Feb 2009, 04:40
by TerryE » 11. Feb 2009, 05:45
by h2o » 11. Feb 2009, 05:52
by TerryE » 11. Feb 2009, 06:10
by h2o » 13. Feb 2009, 04:58
TerryE wrote:I thought about using Fuse to create a file system which exposed the partitions as separate files Partition0, etc. within the root of the FS which are a block image of the virtualised partition on the disk and then just use a loop mount to mount the partition that you need. Writing a Fuse FS like this is pretty straight forward.
apt-get install build-essential libfuse-devgcc vdifuse.c -o vdifuse `pkg-config --cflags --libs fuse` -l:/path/to/virtualbox/VBoxDD.so -Wl,-rpath,/path/to/virtualbox -pthread -I/path/to/virtualbox/headers/includegcc vdifuse.c -o vdifuse `pkg-config --cflags --libs fuse` -l:/path/to/virtualbox/VBoxDD.so -Wl,-rpath,/path/to/virtualbox -pthread -DNO_VBOX_HDRSvdifuse options -f image-file mountpoint-r: readonly mode
-t type: choose image type (auto, VDI, VMDK, VHD, raw)
-a: allow all users to use the disk
-aw: allow all users to modify the disk
-g: run in foreground
-v: verbose
-d: debug fusemodprobe loop (if your loop is in a module)
mount -o loop /path/to/partitions/PartitionX /mount/pointby h2o » 13. Feb 2009, 05:01
/* Original author: h2o on forums.virtualbox.org *
* http://forums.virtualbox.org/viewtopic.php?p=59275 *
* vdifuse.c - tool for mounting VDI/VMDK/VHD files */
/* *
* Available compile flags: *
* -DNO_VBOX_HDRS: don't use the VBox headers *
* (useful if you don't have them) *
* -DOLDAPI: use old VBoxHDD.h api (default uses VBoxHDD-new.h) *
* */
/* This program is free software: you can redistribute it and/or modify *
* it under the terms of the GNU General Public License as published by *
* the Free Software Foundation, either version 3 of the License, or *
* (at your option) any later version. *
* *
* This program is distributed in the hope that it will be useful, *
* but WITHOUT ANY WARRANTY; without even the implied warranty of *
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
* GNU General Public License for more details. *
* *
* You should have received a copy of the GNU General Public License *
* along with this program. If not, see <http://www.gnu.org/licenses/>. */
#define FUSE_USE_VERSION 26
#define FILE_OFFSET_BITS 64
#include <limits.h>
#include <fuse.h>
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <stdarg.h>
#include <string.h>
#include <unistd.h>
#include <pthread.h>
#define IN_RING3
#ifdef NO_VBOX_HDRS // don't use vbox headers
#define VBOX_SUCCESS(i) (__builtin_expect (i >= 0, 1))
#define VBOX_FAILURE(i) (!VBOX_SUCCESS (i))
#ifdef OLDAPI
// PVDIDISK
typedef struct VDIDISK *PVDIDISK;
// Flags
#define VDI_OPEN_FLAGS_NORMAL (0)
#define VDI_OPEN_FLAGS_READONLY (1)
// Functions
extern PVDIDISK VDIDiskCreate (void);
extern int VDIDiskOpenImage (PVDIDISK, const char *, unsigned);
extern void VDIDiskCloseImage (PVDIDISK);
extern int VDIDiskRead (PVDIDISK, uint64_t, void *, size_t);
extern int VDIDiskWrite (PVDIDISK, uint64_t, const void *, size_t);
extern uint64_t VDIDiskGetSize (PVDIDISK);
#else // OLDAPI
// Flags
#define VD_OPEN_FLAGS_NORMAL 0
#define VD_OPEN_FLAGS_READONLY 1
// (P)VDINTERFACE
typedef struct VDINTERFACE
{
const char *pszInterfaceName;
uint32_t cbSize;
struct VDINTERFACE *pNext;
enum { VDINTERFACETYPE_FIRST = 0 } enmInterface;
void *pvUser;
void *pCallbacks;
} VDINTERFACE, *PVDINTERFACE;
// PVBOXHDD
typedef struct VBOXHDD *PVBOXHDD;
extern int VDCreate(PVDINTERFACE, PVBOXHDD *);
extern int VDOpen(PVBOXHDD, const char *, const char *, unsigned, PVDINTERFACE);
extern uint64_t VDGetSize(PVBOXHDD, unsigned);
extern int VDRead(PVBOXHDD, uint64_t, void *, size_t);
extern int VDWrite(PVBOXHDD, uint64_t, const void *, size_t);
extern int VDClose(PVBOXHDD, int /* should be bool */);
#endif // OLDAPI
#else // NO_VBOX_HDRS
#ifdef OLDAPI
#include <VBox/VBoxHDD.h>
#else // OLDAPI
#include <VBox/VBoxHDD-new.h>
#endif
#endif // NO_VBOX_HDRS
#define BLOCKSIZE 512
#ifdef __GNUC__
#define UNUSED __attribute__ ((unused))
#else
#define UNUSED
#endif
// own version of GLib's GList
typedef struct _dlist dlist;
struct _dlist
{
void *data;
dlist *next;
dlist *prev;
};
// sort of like g_list_append
dlist *list_add (dlist *list, void *data)
{
if (list)
while (list && list->next)
list = list->next;
dlist *newlist = malloc (sizeof (dlist));
newlist->data = data;
newlist->next = NULL;
newlist->prev = list;
if (list)
list->next = newlist;
while (newlist && newlist->prev)
newlist = newlist->prev;
return newlist;
}
// printf to stderr
const char *errout_pre = "ERROR: ";
void errout (const char *format, ...)
{
char *tmpfmt = malloc (strlen (errout_pre) + strlen (format) + 2);
strcpy (tmpfmt, errout_pre);
strcat (tmpfmt, format);
strcat (tmpfmt, "\n");
va_list ap;
va_start (ap, format);
vfprintf (stderr, tmpfmt, ap);
va_end (ap);
free (tmpfmt);
fflush (stderr);
}
// verbose printf
int verbose = 0;
void vbprintf (const char *format, ...)
{
if (!verbose)
return;
char *tmpfmt = malloc (strlen (format) + 2);
strcpy (tmpfmt, format);
strcat (tmpfmt, "\n");
va_list ap;
va_start (ap, format);
vprintf (tmpfmt, ap);
va_end (ap);
free (tmpfmt);
fflush (stdout);
}
// partition table entry format
struct mbri
{
uint8_t status;
uint8_t shead;
uint8_t ssector;
uint8_t sbits;
uint8_t type;
uint8_t ehead;
uint8_t esector;
uint8_t ebits;
uint32_t offset;
uint32_t size;
};
typedef struct
{
int pn; // partition #
uint64_t offset; // offset into disk
uint64_t size; // size of partiton
} apart;
dlist *partlist = NULL;
int foreground = 0;
int readonly = 0;
int allowall = 0; // allow all users to read from disk
int allowallw = 0; // allow all users to write to disk
uid_t myuid = 0;
gid_t mygid = 0;
uint64_t disksize = 0;
char *validBackends[] = {"auto", "VDI", "VMDK", "VHD", "raw"};
#define WHOLEPART "EntireDisk"
#ifdef OLDAPI
PVDIDISK vdidisk;
#else
VDINTERFACE dInterface;
PVBOXHDD dDisk;
#endif
// parse extended partitions
int pnse (uint64_t offset)
{
int pn = 5;
while (1)
{
char buf[66];
#ifdef OLDAPI
VDIDiskRead (vdidisk, offset + 446, buf, 66);
#else
VDRead (dDisk, offset + 446, buf, 66);
#endif
struct mbri *entry_a = (struct mbri *)buf;
struct mbri *entry_b = (struct mbri *)(buf + 16);
char *sig = buf + 64;
if (sig[0] != (char)0x55 || sig[1] != (char)0xaa)
{
errout ("invalid ebr signature at offset %llx", offset);
return -1;
}
uint64_t offset64 = (uint64_t)entry_a->offset;
offset64 *= BLOCKSIZE;
uint64_t size64 = (uint64_t)entry_a->size;
size64 *= BLOCKSIZE;
apart *mypart = malloc (sizeof (apart));
mypart->pn = pn;
mypart->offset = offset + offset64;
mypart->size = size64;
partlist = list_add (partlist, mypart);
vbprintf ("Partition %d (logical parition %d):\n\tOffset: %lld bytes\n\tSize: %lld bytes\n", pn, pn - 4, offset64, size64);
uint64_t nextoffset = (uint64_t)entry_b->offset;
if (nextoffset == 0)
break;
nextoffset *= BLOCKSIZE;
offset += nextoffset;
pn++;
}
return 0;
}
// parse primary partitions
int pns ()
{
char dmbr[66];
#ifdef OLDAPI
VDIDiskRead (vdidisk, 446, dmbr, 66);
#else
VDRead (dDisk, 446, dmbr, 66);
#endif
struct mbri *pts = (struct mbri *)dmbr;
char *sig = dmbr + 64;
if (sig[0] != (char)0x55 || sig[1] != (char)0xaa)
{
errout ("invalid mbr signature");
return -1;
}
int i = 0;
while (i < 4)
{
int pn = i + 1;
uint64_t offset64 = (uint64_t)pts[i].offset;
offset64 *= BLOCKSIZE;
uint64_t size64 = (uint64_t)pts[i].size;
size64 *= BLOCKSIZE;
if (size64 == 0)
goto end;
apart *mypart = malloc (sizeof (apart));
mypart->pn = pn;
mypart->offset = offset64;
mypart->size = size64;
partlist = list_add (partlist, mypart);
if (pts[i].type == 5)
if (pnse (offset64) < 0)
return -1;
vbprintf ("Partition %d:\n\tOffset: %lld bytes\n\tSize: %lld bytes\n", pn, offset64, size64);
end:
i++;
}
return 0;
}
// detects type of virtual image
int detectDiskType (char **disktype, char *filename)
{
int fd = open (filename, O_RDONLY);
char buf[8];
read (fd, buf, sizeof (buf));
if (strcmp (buf, "conectix") == 0)
{
*disktype = "VHD";
vbprintf ("disktype is VHD");
return 0;
}
buf[4] = 0;
if (strcmp (buf, "VMDK") == 0 || strcmp (buf, "KDMV") == 0)
{
*disktype = "VMDK";
vbprintf ("disktype is VMDK");
return 0;
}
buf[3] = 0;
if (strcmp (buf, "<<<") == 0)
{
*disktype = "VDI";
vbprintf ("disktype is VDI");
return 0;
}
errout ("cannot autodetect disk type; please use the -t option.");
return -1;
}
// gets partition # from fuse filename
int getpn (const char *c)
{
int ret;
if (strcmp (c, "/" WHOLEPART) == 0)
return 0;
else if (sscanf (c, "/Partition%d", &ret) > 0)
return ret;
else
return -2;
}
// gets apart entry from fuse filename
apart *getpart (const char *c)
{
int pn = getpn (c);
if (pn == -2)
return NULL;
dlist *pm = partlist;
while (pm)
{
if (((apart *)(pm->data))->pn == pn)
return (apart *)pm->data;
pm = pm->next;
}
return NULL;
}
int my_access (const char *c, int i)
{
vbprintf ("access: %s, flags=%d", c, i);
if (strcmp ("/", c) == 0)
return 0;
int partnum = getpn (c);
if (partnum == -2)
return -ENOENT;
int wr = (i & W_OK) ? 1 : 0;
dlist *pm = partlist;
// check if partitions exists
int partexists = 0;
while (pm)
{
apart *mypart = (apart *)pm->data;
if (mypart->pn == partnum)
{
partexists = 1;
break;
}
pm = pm->next;
}
if (!partexists)
return -ENOENT;
struct fuse_context *ctxt = fuse_get_context ();
if (readonly && wr)
return -EROFS;
if
(
ctxt->uid == 0 ||
(allowall && !wr) ||
allowallw ||
ctxt->uid == myuid
)
return 0;
else
return -EACCES;
}
int my_open (const char *c, struct fuse_file_info *i)
{
vbprintf ("open: %s", c);
int aflags = F_OK;
if (i->flags & O_WRONLY)
aflags |= W_OK;
else if (i->flags & O_RDONLY)
aflags |= R_OK;
else if (i->flags & O_RDWR)
aflags |= (W_OK | R_OK);
int ret = my_access (c, aflags);
if (ret < 0)
return ret;
return ret;
}
enum ioop_cmd
{
IOOP_READ,
IOOP_WRITE
};
// function for io operations with disk
pthread_mutex_t disk_mutex = PTHREAD_MUTEX_INITIALIZER;
int ioop (enum ioop_cmd cmd, apart *mypart, off_t offset, void *buf, size_t len)
{
uint64_t totend = offset;
if (totend > disksize)
return -EINVAL;
totend += (uint64_t)len;
if (totend > disksize)
len = (size_t)disksize - (size_t)offset;
int ret;
pthread_mutex_lock (&disk_mutex);
if (cmd == IOOP_READ)
{
#ifdef OLDAPI
ret = VDIDiskRead (vdidisk, offset + mypart->offset, buf, len);
#else
ret = VDRead (dDisk, offset + mypart->offset, buf, len);
#endif
}
else if (cmd == IOOP_WRITE)
{
#ifdef OLDAPI
ret = VDIDiskWrite (vdidisk, offset + mypart->offset, buf, len);
#else
ret = VDWrite (dDisk, offset + mypart->offset, buf, len);
#endif
}
else
return -EINVAL;
pthread_mutex_unlock (&disk_mutex);
if (VBOX_SUCCESS (ret))
return len;
else
return -EIO;
}
int my_read (const char *c, char *out, size_t len, off_t offset, struct fuse_file_info *i UNUSED)
{
vbprintf ("read: %s, offset=%lld, length=%d", c, offset, len);
apart *mypart = getpart (c);
if (!mypart)
return -ENOENT;
return ioop (IOOP_READ, mypart, offset, out, len);
}
int my_write (const char *c, const char *in, size_t len, off_t offset, struct fuse_file_info *i UNUSED)
{
vbprintf ("write: %s, offset=%lld, length=%d", c, offset, len);
apart *mypart = getpart (c);
if (!mypart)
return -ENOENT;
if (readonly)
return -EROFS;
return ioop (IOOP_WRITE, mypart, offset, (char *)in /* avoid const warning*/, len);
}
int my_readdir (const char *p, void *buf, fuse_fill_dir_t filler, off_t offset UNUSED, struct fuse_file_info *i UNUSED)
{
vbprintf ("readdir");
if (strcmp ("/", p) != 0)
return -ENOENT;
dlist *pm = partlist;
filler (buf, ".", NULL, 0);
filler (buf, "..", NULL, 0);
filler (buf, WHOLEPART, NULL, 0);
while (pm)
{
apart *mypart = (apart *)pm->data;
if (mypart->pn == 0)
goto tnext;
char pbuf[PATH_MAX];
sprintf (pbuf, "Partition%d", mypart->pn);
filler (buf, pbuf, NULL, 0);
tnext:
pm = pm->next;
}
return 0;
}
int my_getattr (const char *p, struct stat *stbuf)
{
memset (stbuf, 0, sizeof (struct stat));
vbprintf ("getattr: %s", p);
if (strcmp ("/", p) == 0)
{
stbuf->st_mode = S_IFDIR | 0700;
if (allowall)
stbuf->st_mode |= 07;
}
else if (getpn (p) != -2)
{
stbuf->st_mode = S_IFREG | 0600;
stbuf->st_mode |= 060;
if (allowall)
stbuf->st_mode |= 04;
if (allowallw)
stbuf->st_mode |= 02;
stbuf->st_nlink = 1;
stbuf->st_size = getpart (p)->size;
stbuf->st_uid = myuid;
stbuf->st_gid = mygid;
}
else
return -ENOENT;
return 0;
}
// called when unmounted
void my_destroy (void *u UNUSED)
{
vbprintf ("destroy");
#ifdef OLDAPI
VDIDiskCloseImage (vdidisk);
#else
VDClose (dDisk, 0);
#endif
}
struct fuse_operations oper = {
.readdir = my_readdir,
.getattr = my_getattr,
.access = my_access,
.open = my_open,
.read = my_read,
.write = my_write,
.destroy = my_destroy,
};
void usage (char *p)
{
printf (
"Usage: %s [options] -f image-file mountpoint\n"
"\t-h help\n"
"\t-r readonly\n"
#ifndef OLDAPI
"\t-t specify type (VDI, VMDK, VHD, or raw; default: auto)\n"
#endif
"\t-a allow all users to read disk\n"
"\t-aw allow all users to read and write to disk\n"
"\t-g run in foreground\n"
"\t-v verbose\n"
"\t-d debug\n"
, p);
}
int main (int c, char **v)
{
char *pname = v[0];
if (c < 2)
{
usage (pname);
return 255;
}
#ifndef OLDAPI
char *diskType = "auto";
#endif
char *imagefilename = NULL;
char *mountpoint = NULL;
int debug = 0;
while (*v)
{
if (strcmp (*v, "--help") == 0 || strcmp (*v, "-h") == 0)
{
usage (pname);
return 0;
}
else if (strcmp (*v, "-r") == 0)
readonly = 1;
else if (strcmp (*v, "-g") == 0)
foreground = 1;
else if (strcmp (*v, "-v") == 0)
verbose = 1;
else if (strcmp (*v, "-a") == 0)
allowall = 1;
else if (strcmp (*v, "-aw") == 0)
{
allowall = 1;
allowallw = 1;
}
#ifndef OLDAPI
else if (strcmp (*v, "-t") == 0)
diskType = *++v;
#endif
else if (strcmp (*v, "-f") == 0)
imagefilename = *++v;
else if (strcmp (*v, "-d") == 0)
{
foreground = 1;
debug = 1;
}
else if (*v[0] == '-')
{
errout ("unknown option %s", *v);
return 255;
}
else
mountpoint = *v;
v++;
}
if (!mountpoint)
{
errout ("no mountpoint chosen");
return 1;
}
if (!imagefilename)
{
errout ("no image chosen");
return 1;
}
#ifndef OLDAPI
unsigned int di = 0;
int invalidBackend = 1;
while (di < (sizeof (validBackends) / sizeof (char *)))
{
if (strcmp (validBackends[di], diskType) == 0)
{
invalidBackend = 0;
break;
}
di++;
}
if (invalidBackend)
{
errout ("invalid disk type specified, valid types are VDI, VMDK, VHD, and raw.");
return 1;
}
if (access (imagefilename, F_OK | R_OK | ((!readonly) ? W_OK : 0)) < 0)
{
errout ("cannot access disk: %m", errno);
return 1;
}
if (strcmp ("auto", diskType) == 0)
{
if (detectDiskType (&diskType, imagefilename) < 0)
return 1;
}
#endif
// open disk
#ifdef OLDAPI
vdidisk = VDIDiskCreate ();
int imageopen = VDI_OPEN_FLAGS_NORMAL;
if (readonly)
imageopen = VDI_OPEN_FLAGS_READONLY;
int ret = VDIDiskOpenImage (vdidisk, imagefilename, imageopen);
#else
dInterface.pszInterfaceName = "What's an interface?";
dInterface.enmInterface = VDINTERFACETYPE_FIRST;
VDCreate (&dInterface, &dDisk);
int imageopen = VD_OPEN_FLAGS_NORMAL;
if (readonly)
imageopen = VD_OPEN_FLAGS_READONLY;
int ret = VDOpen (dDisk, diskType, imagefilename, imageopen, &dInterface);
#endif
if (VBOX_FAILURE (ret))
{
errout ("opening vbox image failed, errno %d", ret);
return 1;
}
#ifdef OLDAPI
disksize = VDIDiskGetSize (vdidisk);
#else
disksize = VDGetSize (dDisk, 0);
#endif
apart *rawpart = malloc (sizeof (apart));
rawpart->pn = 0;
rawpart->offset = 0;
rawpart->size = disksize;
partlist = list_add (partlist, rawpart);
if (pns () < 0)
return 1;
myuid = geteuid ();
mygid = getegid ();
struct fuse_args fargs = FUSE_ARGS_INIT (0, NULL);
fuse_opt_add_arg (&fargs, "");
fuse_opt_add_arg (&fargs, mountpoint);
fuse_opt_add_arg (&fargs, "-o");
if (allowall)
fuse_opt_add_arg (&fargs, "allow_other");
else
fuse_opt_add_arg (&fargs, "allow_root");
if (foreground)
fuse_opt_add_arg (&fargs, "-f");
else
verbose = 0;
if (debug)
fuse_opt_add_arg (&fargs, "-d");
#if FUSE_USE_VERSION >= 26
return fuse_main (fargs.argc, fargs.argv, &oper, NULL);
#else
return fuse_main (fargs.argc, fargs.argv, &oper);
#endif
}by TerryE » 13. Feb 2009, 05:46
by echo6 » 14. Feb 2009, 19:08
root@toshiba:/home/echo6/.VirtualBox/VDI# /home/echo6/vdifuse -v -r -t VDI -f /home/echo6/.VirtualBox/VDI/disk1.vdi /media/test/
Partition 1:
Offset: 32256 bytes
Size: 106896384 bytes
Partition 2:
Offset: 106928640 bytes
Size: 1011709440 bytes
Partition 3:
Offset: 1118638080 bytes
Size: 4244244480 bytes
fuse: mount failed: Invalid argument./vdimount -v -f /home/echo6/.VirtualBox/VDI/disk1.vdi partition-number=raw /media/test
ERROR: invalid partition number 0 or port number 0Return to VirtualBox on Linux Hosts
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