1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
|
/*
* 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)
{
log_template_unref(self->template);
self->template = template;
}
gboolean
log_parser_process_message(LogParser *self, LogMessage **pmsg, const LogPathOptions *path_options)
{
LogMessage *msg = *pmsg;
gboolean success;
if (G_LIKELY(!self->template))
{
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, msg, NULL, LTZ_LOCAL, 0, NULL, 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);
return success;
}
static void
log_parser_queue(LogPipe *s, LogMessage *msg, const LogPathOptions *path_options)
{
LogParser *self = (LogParser *) s;
gboolean success;
gchar *parser_result;
msg_trace(">>>>>> parser rule evaluation begin",
evt_tag_str("rule", self->name),
log_pipe_location_tag(s),
evt_tag_printf("msg", "%p", msg));
success = log_parser_process_message(self, &msg, path_options);
if (success)
{
parser_result = "Forwarding message to the next LogPipe";
log_pipe_forward_msg(s, msg, path_options);
}
else
{
parser_result = "Dropping message from LogPipe";
if (path_options->matched)
(*path_options->matched) = FALSE;
log_msg_drop(msg, path_options, AT_PROCESSED);
}
msg_trace("<<<<<< parser rule evaluation result",
evt_tag_str("result", parser_result),
evt_tag_str("rule", self->name),
log_pipe_location_tag(s),
evt_tag_printf("msg", "%p", msg));
}
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);
stats_lock();
StatsClusterKey sc_key;
stats_cluster_logpipe_key_set(&sc_key, SCS_PARSER, self->name, NULL );
stats_register_counter(1, &sc_key, SC_TYPE_DISCARDED, &self->super.discarded_messages);
stats_unlock();
return TRUE;
}
void
log_parser_free_method(LogPipe *s)
{
LogParser *self = (LogParser *) s;
stats_lock();
StatsClusterKey sc_key;
stats_cluster_logpipe_key_set(&sc_key, SCS_PARSER, self->name, NULL );
stats_unregister_counter(&sc_key, SC_TYPE_DISCARDED, &self->super.discarded_messages);
stats_unlock();
g_free(self->name);
log_template_unref(self->template);
log_pipe_free_method(s);
}
void
log_parser_init_instance(LogParser *self, GlobalConfig *cfg)
{
log_pipe_init_instance(&self->super, cfg);
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;
}
|
