1 /*
2 * Copyright (c) 2002-2012 Balabit
3 * Copyright (c) 1998-2012 Balázs Scheidler
4 *
5 * This library is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU Lesser General Public
7 * License as published by the Free Software Foundation; either
8 * version 2.1 of the License, or (at your option) any later version.
9 *
10 * This library is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * Lesser General Public License for more details.
14 *
15 * You should have received a copy of the GNU Lesser General Public
16 * License along with this library; if not, write to the Free Software
17 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
18 *
19 * As an additional exemption you are allowed to compile & link against the
20 * OpenSSL libraries as published by the OpenSSL project. See the file
21 * COPYING for details.
22 *
23 */
24
25 #include "rewrite/rewrite-expr.h"
26
27 /* rewrite */
28
29 void
log_rewrite_set_condition(LogRewrite * self,FilterExprNode * condition)30 log_rewrite_set_condition(LogRewrite *self, FilterExprNode *condition)
31 {
32 self->condition = condition;
33 }
34
35 static void
log_rewrite_queue(LogPipe * s,LogMessage * msg,const LogPathOptions * path_options)36 log_rewrite_queue(LogPipe *s, LogMessage *msg, const LogPathOptions *path_options)
37 {
38 LogRewrite *self = (LogRewrite *) s;
39
40 msg_trace(">>>>>> rewrite rule evaluation begin",
41 evt_tag_str("rule", self->name),
42 log_pipe_location_tag(s),
43 evt_tag_printf("msg", "%p", msg));
44 if (self->condition && !filter_expr_eval_root(self->condition, &msg, path_options))
45 {
46 msg_trace("Rewrite condition unmatched, skipping rewrite",
47 evt_tag_str("value", log_msg_get_value_name(self->value_handle, NULL)),
48 evt_tag_str("rule", self->name),
49 log_pipe_location_tag(s),
50 evt_tag_printf("msg", "%p", msg));
51 }
52 else
53 {
54 self->process(self, &msg, path_options);
55 }
56 msg_trace("<<<<<< rewrite rule evaluation finished",
57 evt_tag_str("rule", self->name),
58 log_pipe_location_tag(s),
59 evt_tag_printf("msg", "%p", msg));
60 log_pipe_forward_msg(s, msg, path_options);
61 }
62
63 gboolean
log_rewrite_init_method(LogPipe * s)64 log_rewrite_init_method(LogPipe *s)
65 {
66 LogRewrite *self = (LogRewrite *) s;
67 GlobalConfig *cfg = log_pipe_get_config(s);
68
69 if (self->condition)
70 filter_expr_init(self->condition, cfg);
71
72 if (!self->name)
73 self->name = cfg_tree_get_rule_name(&cfg->tree, ENC_REWRITE, s->expr_node);
74 return TRUE;
75 }
76
77 void
log_rewrite_free_method(LogPipe * s)78 log_rewrite_free_method(LogPipe *s)
79 {
80 LogRewrite *self = (LogRewrite *) s;
81
82 if (self->condition)
83 filter_expr_unref(self->condition);
84 g_free(self->name);
85 log_pipe_free_method(s);
86 }
87
88 void
log_rewrite_init_instance(LogRewrite * self,GlobalConfig * cfg)89 log_rewrite_init_instance(LogRewrite *self, GlobalConfig *cfg)
90 {
91 log_pipe_init_instance(&self->super, cfg);
92 /* indicate that the rewrite rule is changing the message */
93 self->super.free_fn = log_rewrite_free_method;
94 self->super.queue = log_rewrite_queue;
95 self->super.init = log_rewrite_init_method;
96 self->value_handle = LM_V_MESSAGE;
97 }
98