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/*
* Copyright (c) 2021 One Identity
* Copyright (c) 2021 Xiaoyu Qiu
*
* 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 "regexp-parser.h"
#include "parser/parser-expr.h"
#include "scratch-buffers.h"
#include "string-list.h"
#include <string.h>
typedef struct _RegexpParser
{
LogParser super;
gchar *prefix;
GList *patterns;
LogMatcherOptions matcher_options;
GList *matchers;
} RegexpParser;
LogMatcherOptions *
regexp_parser_get_matcher_options(LogParser *s)
{
RegexpParser *self = (RegexpParser *) s;
return &self->matcher_options;
}
void
regexp_parser_set_prefix(LogParser *s, const gchar *prefix)
{
RegexpParser *self = (RegexpParser *) s;
g_free(self->prefix);
if (prefix)
self->prefix = g_strdup(prefix);
else
self->prefix = NULL;
}
void
regexp_parser_set_patterns(LogParser *s, GList *patterns)
{
RegexpParser *self = (RegexpParser *) s;
string_list_free(self->patterns);
self->patterns = patterns;
}
gboolean
regexp_parser_compile(LogParser *s, GError **error)
{
RegexpParser *self = (RegexpParser *) s;
log_matcher_options_init(&self->matcher_options);
gboolean result = TRUE;
for (GList *item = self->patterns; item; item = item->next)
{
self->matchers = g_list_prepend(self->matchers, log_matcher_new(&self->matcher_options));
log_matcher_pcre_set_nv_prefix((LogMatcher *)self->matchers->data, self->prefix);
if(!log_matcher_compile((LogMatcher *)self->matchers->data, item->data, error))
{
result = FALSE;
break;
}
}
if (result)
self->matchers = g_list_reverse(self->matchers);
else
g_list_free_full(self->matchers, (GDestroyNotify) log_matcher_unref);
return result;
}
static gboolean
regexp_parser_process(LogParser *s, LogMessage **pmsg, const LogPathOptions *path_options, const gchar *input,
gsize input_len)
{
RegexpParser *self = (RegexpParser *) s;
log_msg_make_writable(pmsg, path_options);
msg_trace("regexp-parser message processing started",
evt_tag_str("input", input),
evt_tag_str("prefix", self->prefix),
evt_tag_msg_reference(*pmsg));
gboolean result = FALSE;
for (GList *item = self->matchers; item; item = item->next)
{
msg_trace("regexp-parser message processing for",
evt_tag_str("input", input),
evt_tag_str("pattern", ((LogMatcher *)item->data)->pattern));
gint value_handle = LM_V_MESSAGE;
if (G_UNLIKELY(self->super.template_obj))
value_handle = LM_V_NONE;
if (log_matcher_match((LogMatcher *)item->data, *pmsg, value_handle, input, input_len))
{
result = TRUE;
break;
}
}
return result;
}
static void
regexp_parser_free(LogPipe *s)
{
RegexpParser *self = (RegexpParser *) s;
g_list_free_full(self->matchers, (GDestroyNotify) log_matcher_unref);
log_matcher_options_destroy(&self->matcher_options);
g_free(self->prefix);
string_list_free(self->patterns);
log_parser_free_method(s);
}
static LogPipe *
regexp_parser_clone(LogPipe *s)
{
RegexpParser *self = (RegexpParser *)s;
RegexpParser *cloned;
cloned = (RegexpParser *)regexp_parser_new(s->cfg);
log_parser_clone_settings(&self->super, &cloned->super);
regexp_parser_set_prefix(&cloned->super, self->prefix);
regexp_parser_set_patterns(&cloned->super, string_list_clone(self->patterns));
for (GList *item = self->matchers; item; item = item->next)
cloned->matchers = g_list_append(cloned->matchers, log_matcher_ref((LogMatcher *)item->data));
return &cloned->super.super;
}
LogParser *
regexp_parser_new(GlobalConfig *cfg)
{
RegexpParser *self = g_new0(RegexpParser, 1);
log_parser_init_instance(&self->super, cfg);
self->super.super.free_fn = regexp_parser_free;
self->super.super.clone = regexp_parser_clone;
self->super.process = regexp_parser_process;
log_matcher_options_defaults(&self->matcher_options);
self->matcher_options.flags |= LMF_STORE_MATCHES;
self->patterns = NULL;
return &self->super;
}
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