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/*
* Copyright (c) 2018 Balabit
* Copyright (c) 2018 László Várady <laszlo.varady@balabit.com>
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 as published
* by the Free Software Foundation, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*
* As an additional exemption you are allowed to compile & link against the
* OpenSSL libraries as published by the OpenSSL project. See the file
* COPYING for details.
*
*/
#include "threaded-random-generator.h"
#include "logthrsource/logthrsourcedrv.h"
#include "atomic.h"
#include "messages.h"
#include "str-format.h"
#include <strings.h>
#include <sys/random.h>
#include <unistd.h>
struct ThreadedRandomGeneratorSourceDriver
{
LogThreadedSourceDriver super;
GAtomicCounter exit_requested;
guint freq;
guint bytes;
guint flags;
};
static gboolean
_generate_random_bytes(guint8 *random, guint size, guint flags)
{
guint length = 0;
while (length < size)
{
gssize rc = getrandom(random + length, size - length, flags);
if (rc < 0)
{
msg_error("Could not generate random bytes", evt_tag_error("error"));
return FALSE;
}
length += rc;
}
return TRUE;
}
static void
_request_exit(ThreadedRandomGeneratorSourceDriver *self)
{
g_atomic_counter_set(&self->exit_requested, TRUE);
}
/* runs in a dedicated thread */
static void
_worker_run(LogThreadedSourceWorker *w)
{
ThreadedRandomGeneratorSourceDriver *control = (ThreadedRandomGeneratorSourceDriver *) w->control;
guint8 *random_bytes = g_malloc(control->bytes);
const gsize random_hex_str_size = control->bytes * 2 + 1;
gchar *random_hex_str = g_malloc(random_hex_str_size);
while (!g_atomic_counter_get(&control->exit_requested))
{
if (_generate_random_bytes(random_bytes, control->bytes, control->flags))
{
format_hex_string(random_bytes, control->bytes, random_hex_str, random_hex_str_size);
LogMessage *msg = log_msg_new_empty();
log_msg_set_value(msg, LM_V_MESSAGE, random_hex_str, -1);
log_threaded_source_worker_blocking_post(w, msg);
}
usleep(control->freq * 1000);
}
g_free(random_hex_str);
g_free(random_bytes);
}
static void
_worker_request_exit(LogThreadedSourceWorker *w)
{
ThreadedRandomGeneratorSourceDriver *control = (ThreadedRandomGeneratorSourceDriver *) w->control;
_request_exit(control);
}
static gboolean
_init(LogPipe *s)
{
ThreadedRandomGeneratorSourceDriver *self = (ThreadedRandomGeneratorSourceDriver *) s;
if (!self->bytes)
{
msg_error("The bytes() option for random-generator() is mandatory", log_pipe_location_tag(s));
return FALSE;
}
if (!log_threaded_source_driver_init_method(s))
return FALSE;
return TRUE;
}
static void
_format_stats_key(LogThreadedSourceDriver *s, StatsClusterKeyBuilder *kb)
{
ThreadedRandomGeneratorSourceDriver *self = (ThreadedRandomGeneratorSourceDriver *) s;
stats_cluster_key_builder_add_legacy_label(kb, stats_cluster_label("driver", "random-generator"));
gchar num[64];
g_snprintf(num, sizeof(num), "%u", self->bytes);
stats_cluster_key_builder_add_legacy_label(kb, stats_cluster_label("bytes", num));
g_snprintf(num, sizeof(num), "%u", self->freq);
stats_cluster_key_builder_add_legacy_label(kb, stats_cluster_label("freq", num));
g_snprintf(num, sizeof(num), "%u", self->flags);
stats_cluster_key_builder_add_legacy_label(kb, stats_cluster_label("flags", num));
}
static LogThreadedSourceWorker *
_construct_worker(LogThreadedSourceDriver *s, gint worker_index)
{
LogThreadedSourceWorker *worker = g_new0(LogThreadedSourceWorker, 1);
log_threaded_source_worker_init_instance(worker, s, worker_index);
worker->run = _worker_run;
worker->request_exit = _worker_request_exit;
return worker;
}
void
threaded_random_generator_sd_set_freq(LogDriver *s, gdouble freq)
{
ThreadedRandomGeneratorSourceDriver *self = (ThreadedRandomGeneratorSourceDriver *) s;
self->freq = (guint) (freq * 1000);
}
void
threaded_random_generator_sd_set_bytes(LogDriver *s, guint bytes)
{
ThreadedRandomGeneratorSourceDriver *self = (ThreadedRandomGeneratorSourceDriver *) s;
self->bytes = bytes;
}
gboolean
threaded_random_generator_sd_set_type(LogDriver *s, const gchar *type)
{
ThreadedRandomGeneratorSourceDriver *self = (ThreadedRandomGeneratorSourceDriver *) s;
if (strcasecmp(type, "random") == 0)
self->flags = GRND_RANDOM;
else if (strcasecmp(type, "urandom") == 0)
self->flags = 0;
else
return FALSE;
return TRUE;
}
LogDriver *
threaded_random_generator_sd_new(GlobalConfig *cfg)
{
ThreadedRandomGeneratorSourceDriver *self = g_new0(ThreadedRandomGeneratorSourceDriver, 1);
log_threaded_source_driver_init_instance(&self->super, cfg);
self->freq = 1000;
self->flags = GRND_RANDOM;
g_atomic_counter_set(&self->exit_requested, FALSE);
self->super.super.super.super.init = _init;
self->super.format_stats_key = _format_stats_key;
self->super.worker_construct = _construct_worker;
return &self->super.super.super;
}
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