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/*
Copyright (c) 2006-2012 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.
*/
#include <ctype.h>
#include <sys/uio.h>
#include "glusterfs.h"
#include "xlator.h"
#include "logging.h"
#include "rot-13.h"
/*
* This is a rot13 ``encryption'' xlator. It rot13's data when
* writing to disk and rot13's it back when reading it.
* This xlator is meant as an example, NOT FOR PRODUCTION
* USE ;) (hence no error-checking)
*/
void
rot13 (char *buf, int len)
{
int i;
for (i = 0; i < len; i++) {
if (buf[i] >= 'a' && buf[i] <= 'z')
buf[i] = 'a' + ((buf[i] - 'a' + 13) % 26);
else if (buf[i] >= 'A' && buf[i] <= 'Z')
buf[i] = 'A' + ((buf[i] - 'A' + 13) % 26);
}
}
void
rot13_iovec (struct iovec *vector, int count)
{
int i;
for (i = 0; i < count; i++) {
rot13 (vector[i].iov_base, vector[i].iov_len);
}
}
int32_t
rot13_readv_cbk (call_frame_t *frame,
void *cookie,
xlator_t *this,
int32_t op_ret,
int32_t op_errno,
struct iovec *vector,
int32_t count,
struct iatt *stbuf,
struct iobref *iobref, dict_t *xdata)
{
rot_13_private_t *priv = (rot_13_private_t *)this->private;
if (priv->decrypt_read)
rot13_iovec (vector, count);
STACK_UNWIND_STRICT (readv, frame, op_ret, op_errno, vector, count,
stbuf, iobref, xdata);
return 0;
}
int32_t
rot13_readv (call_frame_t *frame,
xlator_t *this,
fd_t *fd,
size_t size,
off_t offset, uint32_t flags, dict_t *xdata)
{
STACK_WIND (frame,
rot13_readv_cbk,
FIRST_CHILD (this),
FIRST_CHILD (this)->fops->readv,
fd, size, offset, flags, xdata);
return 0;
}
int32_t
rot13_writev_cbk (call_frame_t *frame,
void *cookie,
xlator_t *this,
int32_t op_ret,
int32_t op_errno,
struct iatt *prebuf,
struct iatt *postbuf, dict_t *xdata)
{
STACK_UNWIND_STRICT (writev, frame, op_ret, op_errno, prebuf, postbuf,
xdata);
return 0;
}
int32_t
rot13_writev (call_frame_t *frame,
xlator_t *this,
fd_t *fd,
struct iovec *vector,
int32_t count,
off_t offset, uint32_t flags,
struct iobref *iobref, dict_t *xdata)
{
rot_13_private_t *priv = (rot_13_private_t *)this->private;
if (priv->encrypt_write)
rot13_iovec (vector, count);
STACK_WIND (frame,
rot13_writev_cbk,
FIRST_CHILD (this),
FIRST_CHILD (this)->fops->writev,
fd, vector, count, offset, flags,
iobref, xdata);
return 0;
}
int32_t
init (xlator_t *this)
{
data_t *data = NULL;
rot_13_private_t *priv = NULL;
if (!this->children || this->children->next) {
gf_log ("rot13", GF_LOG_ERROR,
"FATAL: rot13 should have exactly one child");
return -1;
}
if (!this->parents) {
gf_log (this->name, GF_LOG_WARNING,
"dangling volume. check volfile ");
}
priv = GF_CALLOC (sizeof (rot_13_private_t), 1, 0);
if (!priv)
return -1;
priv->decrypt_read = 1;
priv->encrypt_write = 1;
data = dict_get (this->options, "encrypt-write");
if (data) {
if (gf_string2boolean (data->data, &priv->encrypt_write) == -1) {
gf_log (this->name, GF_LOG_ERROR,
"encrypt-write takes only boolean options");
GF_FREE (priv);
return -1;
}
}
data = dict_get (this->options, "decrypt-read");
if (data) {
if (gf_string2boolean (data->data, &priv->decrypt_read) == -1) {
gf_log (this->name, GF_LOG_ERROR,
"decrypt-read takes only boolean options");
GF_FREE (priv);
return -1;
}
}
this->private = priv;
gf_log ("rot13", GF_LOG_DEBUG, "rot13 xlator loaded");
return 0;
}
void
fini (xlator_t *this)
{
rot_13_private_t *priv = this->private;
if (!priv)
return;
this->private = NULL;
GF_FREE (priv);
return;
}
struct xlator_fops fops = {
.readv = rot13_readv,
.writev = rot13_writev
};
struct xlator_cbks cbks;
struct volume_options options[] = {
{ .key = {"encrypt-write"},
.type = GF_OPTION_TYPE_BOOL
},
{ .key = {"decrypt-read"},
.type = GF_OPTION_TYPE_BOOL
},
{ .key = {NULL} },
};
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