diff options
Diffstat (limited to 'xlators/playground/rot-13/src/rot-13.c')
| -rw-r--r-- | xlators/playground/rot-13/src/rot-13.c | 166 |
1 files changed, 166 insertions, 0 deletions
diff --git a/xlators/playground/rot-13/src/rot-13.c b/xlators/playground/rot-13/src/rot-13.c new file mode 100644 index 00000000000..0f45ee31964 --- /dev/null +++ b/xlators/playground/rot-13/src/rot-13.c @@ -0,0 +1,166 @@ +/* + 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/glusterfs.h> +#include <glusterfs/xlator.h> +#include <glusterfs/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}}, +}; |