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Recognize encryption format of qcow volumes. 

(The implementation is not very generic, but that can be very
easily rectified if/when new encryption formats appear.)

* src/storage_backend_fs.c: Probe for qcow/qcow2 encryption
  algorithm field
This commit is contained in:
Miloslav Trmač 2009-07-21 01:26:09 +02:00 committed by Daniel P. Berrange
parent eda3af2488
commit d288703d57
1 changed files with 47 additions and 14 deletions
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61
src/storage_backend_fs.c
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@ -26,6 +26,7 @@
#include <sys/statvfs.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <stdbool.h>
#include <stdio.h>
#include <dirent.h>
#include <errno.h>
@ -81,6 +82,9 @@ struct FileTypeInfo {
/* Store a COW base image path (possibly relative),
* or NULL if there is no COW base image, to RES;
* return BACKING_STORE_* */
int qcowCryptOffset; /* Byte offset from start of file
* where to find encryption mode,
* -1 if encryption is not used */
int (*getBackingStore)(virConnectPtr conn, char **res,
const unsigned char *buf, size_t buf_size);
};
@ -89,54 +93,54 @@ struct FileTypeInfo const fileTypeInfo[] = {
/* XXX Untested
{ VIR_STORAGE_VOL_FILE_BOCHS, "Bochs Virtual HD Image", NULL,
LV_LITTLE_ENDIAN, 64, 0x20000,
32+16+16+4+4+4+4+4, 8, 1, NULL },*/
32+16+16+4+4+4+4+4, 8, 1, -1, NULL },*/
/* CLoop */
/* XXX Untested
{ VIR_STORAGE_VOL_CLOOP, "#!/bin/sh\n#V2.0 Format\nmodprobe cloop file=$0 && mount -r -t iso9660 /dev/cloop $1\n", NULL,
LV_LITTLE_ENDIAN, -1, 0,
-1, 0, 0, NULL }, */
-1, 0, 0, -1, NULL }, */
/* Cow */
{ VIR_STORAGE_VOL_FILE_COW, "OOOM", NULL,
LV_BIG_ENDIAN, 4, 2,
4+4+1024+4, 8, 1, cowGetBackingStore },
4+4+1024+4, 8, 1, -1, cowGetBackingStore },
/* DMG */
/* XXX QEMU says there's no magic for dmg, but we should check... */
{ VIR_STORAGE_VOL_FILE_DMG, NULL, ".dmg",
0, -1, 0,
-1, 0, 0, NULL },
-1, 0, 0, -1, NULL },
/* XXX there's probably some magic for iso we can validate too... */
{ VIR_STORAGE_VOL_FILE_ISO, NULL, ".iso",
0, -1, 0,
-1, 0, 0, NULL },
-1, 0, 0, -1, NULL },
/* Parallels */
/* XXX Untested
{ VIR_STORAGE_VOL_FILE_PARALLELS, "WithoutFreeSpace", NULL,
LV_LITTLE_ENDIAN, 16, 2,
16+4+4+4+4, 4, 512, NULL },
16+4+4+4+4, 4, 512, -1, NULL },
*/
/* QCow */
{ VIR_STORAGE_VOL_FILE_QCOW, "QFI", NULL,
LV_BIG_ENDIAN, 4, 1,
4+4+8+4+4, 8, 1, qcowXGetBackingStore },
4+4+8+4+4, 8, 1, 4+4+8+4+4+8+1+1+2, qcowXGetBackingStore },
/* QCow 2 */
{ VIR_STORAGE_VOL_FILE_QCOW2, "QFI", NULL,
LV_BIG_ENDIAN, 4, 2,
4+4+8+4+4, 8, 1, qcowXGetBackingStore },
4+4+8+4+4, 8, 1, 4+4+8+4+4+8, qcowXGetBackingStore },
/* VMDK 3 */
/* XXX Untested
{ VIR_STORAGE_VOL_FILE_VMDK, "COWD", NULL,
LV_LITTLE_ENDIAN, 4, 1,
4+4+4, 4, 512, NULL },
4+4+4, 4, 512, -1, NULL },
*/
/* VMDK 4 */
{ VIR_STORAGE_VOL_FILE_VMDK, "KDMV", NULL,
LV_LITTLE_ENDIAN, 4, 1,
4+4+4, 8, 512, vmdk4GetBackingStore },
4+4+4, 8, 512, -1, vmdk4GetBackingStore },
/* Connectix / VirtualPC */
/* XXX Untested
{ VIR_STORAGE_VOL_FILE_VPC, "conectix", NULL,
LV_BIG_ENDIAN, -1, 0,
-1, 0, 0, NULL},
-1, 0, 0, -1, NULL},
*/
};
@ -282,13 +286,16 @@ static int virStorageBackendProbeTarget(virConnectPtr conn,
virStorageVolTargetPtr target,
char **backingStore,
unsigned long long *allocation,
unsigned long long *capacity) {
unsigned long long *capacity,
virStorageEncryptionPtr *encryption) {
int fd;
unsigned char head[20*512]; /* vmdk4GetBackingStore needs this much. */
int len, i, ret;
if (backingStore)
*backingStore = NULL;
if (encryption)
*encryption = NULL;
if ((fd = open(target->path, O_RDONLY)) < 0) {
virReportSystemError(conn, errno,
@ -317,6 +324,8 @@ static int virStorageBackendProbeTarget(virConnectPtr conn,
/* First check file magic */
for (i = 0 ; i < ARRAY_CARDINALITY(fileTypeInfo) ; i++) {
int mlen;
bool encrypted_qcow = false;
if (fileTypeInfo[i].magic == NULL)
continue;
@ -375,6 +384,16 @@ static int virStorageBackendProbeTarget(virConnectPtr conn,
*capacity *= fileTypeInfo[i].sizeMultiplier;
}
if (fileTypeInfo[i].qcowCryptOffset != -1) {
int crypt_format;
crypt_format = (head[fileTypeInfo[i].qcowCryptOffset] << 24) |
(head[fileTypeInfo[i].qcowCryptOffset+1] << 16) |
(head[fileTypeInfo[i].qcowCryptOffset+2] << 8) |
head[fileTypeInfo[i].qcowCryptOffset+3];
encrypted_qcow = crypt_format != 0;
}
/* Validation passed, we know the file format now */
target->format = fileTypeInfo[i].type;
if (fileTypeInfo[i].getBackingStore != NULL && backingStore) {
@ -400,6 +419,18 @@ static int virStorageBackendProbeTarget(virConnectPtr conn,
}
}
}
if (encryption != NULL && encrypted_qcow) {
virStorageEncryptionPtr enc;
if (VIR_ALLOC(enc) < 0) {
virReportOOMError(conn);
if (backingStore)
VIR_FREE(*backingStore);
return -1;
}
enc->format = VIR_STORAGE_ENCRYPTION_FORMAT_QCOW;
*encryption = enc;
}
return 0;
}
@ -868,7 +899,8 @@ virStorageBackendFileSystemRefresh(virConnectPtr conn,
&vol->target,
&backingStore,
&vol->allocation,
&vol->capacity) < 0)) {
&vol->capacity,
&vol->target.encryption) < 0)) {
if (ret == -1)
goto cleanup;
else {
@ -908,7 +940,8 @@ virStorageBackendFileSystemRefresh(virConnectPtr conn,
if ((ret = virStorageBackendProbeTarget(conn,
&vol->backingStore,
NULL, NULL, NULL)) < 0) {
NULL, NULL, NULL,
NULL)) < 0) {
if (ret == -1)
goto cleanup;
else {