diff options
Diffstat (limited to 'xlators/experimental/encryption/rot-13/src/rot-13.c')
| -rw-r--r-- | xlators/experimental/encryption/rot-13/src/rot-13.c | 196 |
1 files changed, 196 insertions, 0 deletions
diff --git a/xlators/experimental/encryption/rot-13/src/rot-13.c b/xlators/experimental/encryption/rot-13/src/rot-13.c new file mode 100644 index 00000000000..6ec1b47c87b --- /dev/null +++ b/xlators/experimental/encryption/rot-13/src/rot-13.c @@ -0,0 +1,196 @@ +/* + 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} }, +}; |