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/*
* Copyright (c) 2002-2013 Balabit
* Copyright (c) 1998-2013 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 "rewrite-subst.h"
/* LogRewriteSubst
*
* This class implements the "subst" expression in a rewrite rule.
*/
typedef struct _LogRewriteSubst LogRewriteSubst;
struct _LogRewriteSubst
{
LogRewrite super;
LogMatcherOptions matcher_options;
LogMatcher *matcher;
LogTemplate *replacement;
};
LogMatcherOptions *
log_rewrite_subst_get_matcher_options(LogRewrite *s)
{
LogRewriteSubst *self = (LogRewriteSubst *) s;
return &self->matcher_options;
}
void
log_rewrite_subst_process(LogRewrite *s, LogMessage **pmsg, const LogPathOptions *path_options)
{
LogRewriteSubst *self = (LogRewriteSubst *) s;
LogMessage *msg;
NVTable *nvtable;
const gchar *value;
gchar *new_value;
gssize length;
gssize new_length = -1;
msg = log_msg_make_writable(pmsg, path_options);
nvtable = nv_table_ref(msg->payload);
value = log_msg_get_value(msg, self->super.value_handle, &length);
new_value = log_matcher_replace(self->matcher, msg, self->super.value_handle, value, length, self->replacement,
&new_length);
if (new_value)
{
msg_trace("Performing subst() rewrite",
evt_tag_str("rule", s->name),
evt_tag_str("value", log_msg_get_value_name(s->value_handle, NULL)),
evt_tag_mem("input", value, length),
evt_tag_str("type", self->matcher_options.type),
evt_tag_str("pattern", self->matcher->pattern),
evt_tag_str("replacement", self->replacement->template_str),
log_pipe_location_tag(&s->super));
log_msg_set_value(msg, self->super.value_handle, new_value, new_length);
}
else
{
msg_trace("Performing subst() rewrite failed, pattern did not match",
evt_tag_str("rule", s->name),
evt_tag_str("value", log_msg_get_value_name(s->value_handle, NULL)),
evt_tag_mem("input", value, length),
evt_tag_str("type", self->matcher_options.type),
evt_tag_str("pattern", self->matcher->pattern),
evt_tag_str("replacement", self->replacement->template_str),
log_pipe_location_tag(&s->super));
}
nv_table_unref(nvtable);
g_free(new_value);
}
gboolean
log_rewrite_subst_compile_pattern(LogRewrite *s, const gchar *regexp, GError **error)
{
LogRewriteSubst *self = (LogRewriteSubst *) s;
log_matcher_options_init(&self->matcher_options);
self->matcher = log_matcher_new(&self->matcher_options);
if (!log_matcher_is_replace_supported(self->matcher))
{
g_set_error(error, LOG_MATCHER_ERROR, 0,
"subst() only supports matchers that allow replacement, glob is not one of these");
return FALSE;
}
return log_matcher_compile(self->matcher, regexp, error);
}
static LogPipe *
log_rewrite_subst_clone(LogPipe *s)
{
LogRewriteSubst *self = (LogRewriteSubst *) s;
LogRewriteSubst *cloned;
cloned = (LogRewriteSubst *) log_rewrite_subst_new(self->replacement, s->cfg);
log_rewrite_clone_method(&cloned->super, &self->super);
cloned->matcher = log_matcher_ref(self->matcher);
return &cloned->super.super;
}
void
log_rewrite_subst_free(LogPipe *s)
{
LogRewriteSubst *self = (LogRewriteSubst *) s;
log_matcher_unref(self->matcher);
log_template_unref(self->replacement);
log_matcher_options_destroy(&self->matcher_options);
log_rewrite_free_method(s);
}
LogRewrite *
log_rewrite_subst_new(LogTemplate *replacement, GlobalConfig *cfg)
{
LogRewriteSubst *self = g_new0(LogRewriteSubst, 1);
log_rewrite_init_instance(&self->super, cfg);
self->super.super.free_fn = log_rewrite_subst_free;
self->super.super.clone = log_rewrite_subst_clone;
self->super.process = log_rewrite_subst_process;
self->replacement = log_template_ref(replacement);
log_matcher_options_defaults(&self->matcher_options);
return &self->super;
}
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