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/*
Copyright (c) 2015 Red Hat, Inc. <http://www.redhat.com>
This file is part of GlusterFS.
This file is licensed to you under your choice of the GNU Lesser
General Public License, version 3 or any later version (LGPLv3 or
later), or the GNU General Public License, version 2 (GPLv2), in all
cases as published by the Free Software Foundation.
*/
#ifndef __BIT_ROT_COMMON_H__
#define __BIT_ROT_COMMON_H__
#ifndef _CONFIG_H
#define _CONFIG_H
#include "config.h"
#endif
#include "glusterfs.h"
/**
* on-disk formats for ongoing version and object signature.
*/
typedef struct br_version {
unsigned long ongoingversion;
uint32_t timebuf[2];
} br_version_t;
typedef struct br_signature {
int8_t signaturetype;
unsigned long signedversion;
char signature[0];
} br_signature_t;
#define BR_VXATTR_VERSION (1 << 0)
#define BR_VXATTR_SIGNATURE (1 << 1)
#define BR_VXATTR_SIGN_MISSING (BR_VXATTR_SIGNATURE)
#define BR_VXATTR_ALL_MISSING \
(BR_VXATTR_VERSION | BR_VXATTR_SIGNATURE)
typedef enum br_vxattr_state {
BR_VXATTR_STATUS_FULL = 0,
BR_VXATTR_STATUS_MISSING = 1,
BR_VXATTR_STATUS_UNSIGNED = 2,
BR_VXATTR_STATUS_INVALID = 3,
} br_vxattr_status_t;
static inline br_vxattr_status_t
br_version_xattr_state (dict_t *xattr,
br_version_t **obuf, br_signature_t **sbuf)
{
int32_t ret = 0;
int32_t vxattr = 0;
br_vxattr_status_t status;
ret = dict_get_bin (xattr, BITROT_CURRENT_VERSION_KEY, (void **)obuf);
if (ret)
vxattr |= BR_VXATTR_VERSION;
ret = dict_get_bin (xattr, BITROT_SIGNING_VERSION_KEY, (void **)sbuf);
if (ret)
vxattr |= BR_VXATTR_SIGNATURE;
switch (vxattr) {
case 0:
status = BR_VXATTR_STATUS_FULL;
break;
case BR_VXATTR_SIGN_MISSING:
status = BR_VXATTR_STATUS_UNSIGNED;
break;
case BR_VXATTR_ALL_MISSING:
status = BR_VXATTR_STATUS_MISSING;
break;
default:
status = BR_VXATTR_STATUS_INVALID;
}
return status;
}
/**
* in-memory representation of signature used by signer for object
* signing.
*/
typedef struct br_isignature_in {
int8_t signaturetype; /* signature type */
unsigned long signedversion; /* version against which the
object was signed */
char signature[0]; /* object signature */
} br_isignature_t;
/**
* in-memory representation of signature used by scrubber for object
* verification.
*/
typedef struct br_isignature_out {
char stale; /* stale signature? */
uint32_t time[2]; /* time when the object
got dirtied */
int8_t signaturetype; /* hash type */
char signature[0]; /* signature (hash) */
} br_isignature_out_t;
typedef struct br_stub_init {
uint32_t timebuf[2];
char export[PATH_MAX];
} br_stub_init_t;
typedef enum {
BR_SIGNATURE_TYPE_VOID = -1, /* object is not signed */
BR_SIGNATURE_TYPE_ZERO = 0, /* min boundary */
BR_SIGNATURE_TYPE_SHA256 = 1, /* signed with SHA256 */
BR_SIGNATURE_TYPE_MAX = 2, /* max boundary */
} br_signature_type;
/* BitRot stub start time (virtual xattr) */
#define GLUSTERFS_GET_BR_STUB_INIT_TIME "trusted.glusterfs.bit-rot.stub-init"
static inline int
br_is_signature_type_valid (int8_t signaturetype)
{
return ((signaturetype > BR_SIGNATURE_TYPE_ZERO)
&& (signaturetype < BR_SIGNATURE_TYPE_MAX));
}
static inline void
br_set_default_ongoingversion (br_version_t *buf, uint32_t *tv)
{
buf->ongoingversion = BITROT_DEFAULT_CURRENT_VERSION;
buf->timebuf[0] = tv[0];
buf->timebuf[1] = tv[1];
}
static inline void
br_set_default_signature (br_signature_t *buf, size_t *size)
{
buf->signaturetype = (int8_t) BR_SIGNATURE_TYPE_VOID;
buf->signedversion = BITROT_DEFAULT_SIGNING_VERSION;
*size = sizeof (br_signature_t); /* no signature */
}
static inline void
br_set_ongoingversion (br_version_t *buf,
unsigned long version, uint32_t *tv)
{
buf->ongoingversion = version;
buf->timebuf[0] = tv[0];
buf->timebuf[1] = tv[1];
}
static inline void
br_set_signature (br_signature_t *buf,
br_isignature_t *sign, size_t signaturelen, size_t *size)
{
buf->signaturetype = sign->signaturetype;
buf->signedversion = ntohl (sign->signedversion);
memcpy (buf->signature, sign->signature, signaturelen);
*size = sizeof (br_signature_t) + signaturelen;
}
#endif /* __BIT_ROT_COMMON_H__ */
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