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/*
Copyright (c) 2013 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 "xlator.h"
#include "defaults.h"
#ifdef HAVE_BACKTRACE
#include <execinfo.h>
#else
#include "execinfo_compat.h"
#endif
#define NUM_FRAMES 20
static char PROTECT_KEY[] = "trusted.glusterfs.protect";
enum {
PROT_ACT_NONE = 0,
PROT_ACT_LOG,
PROT_ACT_REJECT,
};
void
pcli_print_trace (char *name, call_frame_t *frame)
{
void *frames[NUM_FRAMES];
char **symbols;
int size;
int i;
gf_log (name, GF_LOG_INFO, "Translator stack:");
while (frame) {
gf_log (name, GF_LOG_INFO, "%s (%s)",
frame->wind_from, frame->this->name);
frame = frame->next;
}
size = backtrace (frames, NUM_FRAMES);
if (size <= 0) {
return;
}
symbols = backtrace_symbols (frames, size);
if (!symbols) {
return;
}
gf_log (name, GF_LOG_INFO, "Processor stack:");
for (i = 0; i < size; ++i) {
gf_log (name, GF_LOG_INFO, "%s", symbols[i]);
}
free (symbols);
}
int32_t
pcli_rename (call_frame_t *frame, xlator_t *this, loc_t *oldloc,
loc_t *newloc, dict_t *xdata)
{
uint64_t value;
if (newloc->parent == oldloc->parent) {
gf_log (this->name, GF_LOG_DEBUG, "rename in same directory");
goto simple_unwind;
}
if (!oldloc->parent) {
goto simple_unwind;
}
if (inode_ctx_get (oldloc->parent, this, &value) != 0) {
goto simple_unwind;
}
if (value != PROT_ACT_NONE) {
gf_log (this->name, GF_LOG_WARNING,
"got rename for protected %s", oldloc->path);
pcli_print_trace (this->name, frame->next);
if (value == PROT_ACT_REJECT) {
STACK_UNWIND_STRICT (rename, frame, -1, EPERM,
NULL, NULL, NULL, NULL, NULL,
xdata);
return 0;
}
}
simple_unwind:
STACK_WIND_TAIL (frame, FIRST_CHILD(this),
FIRST_CHILD(this)->fops->rename, oldloc, newloc,
xdata);
return 0;
}
int32_t
pcli_setxattr (call_frame_t *frame, xlator_t *this, loc_t *loc, dict_t *dict,
int32_t flags, dict_t *xdata)
{
data_t *data;
uint64_t value;
/*
* We can't use dict_get_str and strcmp here, because the value comes
* directly from the user and might not be NUL-terminated (it would
* be if we had set it ourselves.
*/
data = dict_get(dict,PROTECT_KEY);
if (!data) {
goto simple_wind;
}
if (dict->count > 1) {
gf_log (this->name, GF_LOG_WARNING,
"attempted to mix %s with other keys", PROTECT_KEY);
goto simple_wind;
}
gf_log (this->name, GF_LOG_DEBUG, "got %s request", PROTECT_KEY);
if (!strncmp(data->data,"log",data->len)) {
gf_log (this->name, GF_LOG_DEBUG,
"logging removals on %s", loc->path);
value = PROT_ACT_LOG;
}
else if (!strncmp(data->data,"reject",data->len)) {
gf_log (this->name, GF_LOG_DEBUG,
"rejecting removals on %s", loc->path);
value = PROT_ACT_REJECT;
}
else {
gf_log (this->name, GF_LOG_DEBUG,
"removing protection on %s", loc->path);
value = PROT_ACT_NONE;
}
/* Right now the value doesn't matter - just the presence. */
if (inode_ctx_set(loc->inode,this,&value) != 0) {
gf_log (this->name, GF_LOG_WARNING,
"failed to set protection status for %s", loc->path);
}
STACK_UNWIND_STRICT (setxattr, frame, 0, 0, NULL);
return 0;
simple_wind:
STACK_WIND_TAIL (frame,
FIRST_CHILD(this), FIRST_CHILD(this)->fops->setxattr,
loc, dict, flags, xdata);
return 0;
}
int32_t
pcli_unlink (call_frame_t *frame, xlator_t *this, loc_t *loc, int xflag,
dict_t *xdata)
{
uint64_t value;
if (!loc->parent || (inode_ctx_get(loc->parent,this,&value) != 0)) {
goto simple_unwind;
}
if (value != PROT_ACT_NONE) {
gf_log (this->name, GF_LOG_WARNING,
"got unlink for protected %s", loc->path);
pcli_print_trace(this->name,frame->next);
if (value == PROT_ACT_REJECT) {
STACK_UNWIND_STRICT (unlink, frame, -1, EPERM,
NULL, NULL, NULL);
return 0;
}
}
simple_unwind:
STACK_WIND_TAIL (frame, FIRST_CHILD(this),
FIRST_CHILD(this)->fops->unlink, loc, xflag, xdata);
return 0;
}
int32_t
init (xlator_t *this)
{
if (!this->children || this->children->next) {
gf_log (this->name, GF_LOG_ERROR,
"translator not configured with exactly one child");
return -1;
}
if (!this->parents) {
gf_log (this->name, GF_LOG_WARNING,
"dangling volume. check volfile ");
}
return 0;
}
void
fini (xlator_t *this)
{
return;
}
struct xlator_fops fops = {
.rename = pcli_rename,
.setxattr = pcli_setxattr,
.unlink = pcli_unlink,
};
struct xlator_cbks cbks = {
};
struct volume_options options[] = {
{ .key = {NULL} },
};
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