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/*
* Copyright (c) 2002-2012 Balabit
* Copyright (c) 1998-2012 Balázs Scheidler
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; 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 "parser/parser-expr.h"
#include "template/templates.h"
#include "logmatcher.h"
#include <string.h>
/* NOTE: consumes template */
void
log_parser_set_template(LogParser *self, LogTemplate *template_obj)
{
log_template_unref(self->template_obj);
self->template_obj = template_obj;
}
void
log_parser_clone_settings(LogParser *self, LogParser *cloned)
{
log_pipe_clone_method(&cloned->super, &self->super);
log_parser_set_template(cloned, log_template_ref(self->template_obj));
}
gboolean
log_parser_process_message(LogParser *self, LogMessage **pmsg, const LogPathOptions *path_options)
{
LogMessage *msg = *pmsg;
gboolean success;
if (G_LIKELY(!self->template_obj))
{
NVTable *payload = nv_table_ref(msg->payload);
const gchar *value;
gssize value_len;
/* NOTE: the process function may set values in the LogMessage
* instance, which in turn can trigger nv_table_realloc() to be
* called. However in case nv_table_realloc() finds a refcounter > 1,
* it'll always _move_ the structure and leave the old one intact,
* until its refcounter drops to zero. If that wouldn't be the case,
* nv_table_realloc() could make our payload pointer and the
* LM_V_MESSAGE pointer we pass to process() go stale.
*/
value = log_msg_get_value(msg, LM_V_MESSAGE, &value_len);
success = self->process(self, pmsg, path_options, value, value_len);
nv_table_unref(payload);
}
else
{
GString *input = g_string_sized_new(256);
log_template_format(self->template_obj, msg, &DEFAULT_TEMPLATE_EVAL_OPTIONS, input);
success = self->process(self, pmsg, path_options, input->str, input->len);
g_string_free(input, TRUE);
}
if (!success)
stats_counter_inc(self->super.discarded_messages);
else
stats_counter_inc(self->processed_messages);
return success;
}
void
log_parser_queue_method(LogPipe *s, LogMessage *msg, const LogPathOptions *path_options)
{
LogParser *self = (LogParser *) s;
gboolean success;
msg_trace(">>>>>> parser rule evaluation begin",
evt_tag_str("rule", self->name),
log_pipe_location_tag(s),
evt_tag_msg_reference(msg));
success = log_parser_process_message(self, &msg, path_options);
msg_trace("<<<<<< parser rule evaluation result",
evt_tag_str("result", success ? "accepted" : "rejected"),
evt_tag_str("rule", self->name),
log_pipe_location_tag(s),
evt_tag_msg_reference(msg));
if (success)
{
log_pipe_forward_msg(s, msg, path_options);
}
else
{
if (path_options->matched)
(*path_options->matched) = FALSE;
log_msg_drop(msg, path_options, AT_PROCESSED);
}
}
static void
_register_counters(LogParser *self)
{
gint level = log_pipe_is_internal(&self->super) ? STATS_LEVEL3 : STATS_LEVEL1;
stats_lock();
StatsClusterKey sc_key;
StatsClusterLabel labels[] = { stats_cluster_label("id", self->name) };
stats_cluster_logpipe_key_set(&sc_key, "parsed_events_total", labels, G_N_ELEMENTS(labels));
stats_cluster_logpipe_key_add_legacy_alias(&sc_key, SCS_PARSER, self->name, NULL );
stats_register_counter(level, &sc_key, SC_TYPE_DISCARDED, &self->super.discarded_messages);
stats_register_counter(level, &sc_key, SC_TYPE_PROCESSED, &self->processed_messages);
stats_unlock();
}
gboolean
log_parser_init_method(LogPipe *s)
{
LogParser *self = (LogParser *) s;
GlobalConfig *cfg = log_pipe_get_config(s);
if (!self->name && s->expr_node)
self->name = cfg_tree_get_rule_name(&cfg->tree, ENC_PARSER, s->expr_node);
_register_counters(self);
return TRUE;
}
static void
_unregister_stats(LogParser *self)
{
stats_lock();
StatsClusterKey sc_key;
StatsClusterLabel labels[] = { stats_cluster_label("id", self->name) };
stats_cluster_logpipe_key_set(&sc_key, "parsed_events_total", labels, G_N_ELEMENTS(labels));
stats_cluster_logpipe_key_add_legacy_alias(&sc_key, SCS_PARSER, self->name, NULL );
stats_unregister_counter(&sc_key, SC_TYPE_DISCARDED, &self->super.discarded_messages);
stats_unregister_counter(&sc_key, SC_TYPE_PROCESSED, &self->processed_messages);
stats_unlock();
}
gboolean
log_parser_deinit_method(LogPipe *s)
{
LogParser *self = (LogParser *) s;
_unregister_stats(self);
return TRUE;
}
void
log_parser_free_method(LogPipe *s)
{
LogParser *self = (LogParser *) s;
g_free(self->name);
log_template_unref(self->template_obj);
log_pipe_free_method(s);
}
void
log_parser_init_instance(LogParser *self, GlobalConfig *cfg)
{
log_pipe_init_instance(&self->super, cfg);
self->super.flags |= PIF_CONFIG_RELATED + PIF_SYNC_FILTERX;
self->super.init = log_parser_init_method;
self->super.deinit = log_parser_deinit_method;
self->super.free_fn = log_parser_free_method;
self->super.queue = log_parser_queue_method;
}
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