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/*
* Copyright (c) 2019 Balazs Scheidler <bazsi77@gmail.com>
*
* 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 "add-contextual-data-glob-selector.h"
#include "scratch-buffers.h"
#include "messages.h"
typedef struct _GlobExpression
{
gchar *pattern;
GPatternSpec *expr;
} GlobExpression;
static void
glob_expression_populate(GlobExpression *gs, const gchar *pattern)
{
gs->pattern = g_strdup(pattern);
gs->expr = g_pattern_spec_new(pattern);
}
static void
glob_expression_clear(GlobExpression *gs)
{
g_free(gs->pattern);
g_pattern_spec_free(gs->expr);
}
typedef struct _AddContextualDataGlobSelector
{
AddContextualDataSelector super;
GArray *globs;
LogTemplate *glob_template;
} AddContextualDataGlobSelector;
static GArray *
_create_globs_array(void)
{
GArray *array = g_array_new(FALSE, TRUE, sizeof(GlobExpression));
return array;
}
static void
_populate_globs_array(AddContextualDataGlobSelector *self, GList *ordered_selectors)
{
for (GList *l = ordered_selectors; l; l = l->next)
{
const gchar *selector = (const gchar *) l->data;
GlobExpression gs;
glob_expression_populate(&gs, selector);
g_array_append_val(self->globs, gs);
}
}
static GArray *
_clone_globs_array(GArray *src)
{
GArray *dst = _create_globs_array();
for (gint i = 0; i < src->len; i++)
{
GlobExpression *src_expr = &g_array_index(src, GlobExpression, i);
GlobExpression dst_expr;
glob_expression_populate(&dst_expr, src_expr->pattern);
g_array_append_val(dst, dst_expr);
}
return dst;
}
static const gchar *
_find_first_matching_glob(AddContextualDataGlobSelector *self, LogMessage *msg)
{
GString *string = scratch_buffers_alloc();
GString *string_reversed = scratch_buffers_alloc();
log_template_format(self->glob_template, msg, &DEFAULT_TEMPLATE_EVAL_OPTIONS, string);
g_string_assign(string_reversed, string->str);
g_strreverse(string_reversed->str);
for (gint i = 0; i < self->globs->len; i++)
{
GlobExpression *gs = &g_array_index(self->globs, GlobExpression, i);
gboolean result = g_pattern_spec_match(gs->expr, string->len, string->str, string_reversed->str);
msg_trace("add-contextual-data(): Evaluating glob against message",
evt_tag_str("glob-template", self->glob_template->template_str),
evt_tag_str("string", string->str),
evt_tag_str("pattern", gs->pattern),
evt_tag_int("matched", result));
if (result)
return gs->pattern;
}
return NULL;
}
static gboolean
_init(AddContextualDataSelector *s, GList *ordered_selectors)
{
AddContextualDataGlobSelector *self = (AddContextualDataGlobSelector *)s;
_populate_globs_array(self, ordered_selectors);
return TRUE;
}
static gchar *
_resolve(AddContextualDataSelector *s, LogMessage *msg)
{
AddContextualDataGlobSelector *self = (AddContextualDataGlobSelector *)s;
return g_strdup(_find_first_matching_glob(self, msg));
}
static void
_free(AddContextualDataSelector *s)
{
AddContextualDataGlobSelector *self = (AddContextualDataGlobSelector *)s;
log_template_unref(self->glob_template);
for (int i = 0; i < self->globs->len; i++)
{
GlobExpression *gs = &g_array_index(self->globs, GlobExpression, i);
glob_expression_clear(gs);
}
g_array_free(self->globs, TRUE);
}
static AddContextualDataSelector *_clone(AddContextualDataSelector *s,
GlobalConfig *cfg);
static void
add_contextual_data_glob_selector_init_instance(AddContextualDataGlobSelector *self, LogTemplate *glob_template)
{
self->super.ordering_required = TRUE;
self->super.resolve = _resolve;
self->super.free = _free;
self->super.init = _init;
self->super.clone = _clone;
self->glob_template = glob_template;
}
static AddContextualDataSelector *
_clone(AddContextualDataSelector *s, GlobalConfig *cfg)
{
AddContextualDataGlobSelector *self = (AddContextualDataGlobSelector *) s;
AddContextualDataGlobSelector *cloned = g_new0(AddContextualDataGlobSelector, 1);
add_contextual_data_glob_selector_init_instance(cloned, log_template_ref(self->glob_template));
cloned->globs = _clone_globs_array(self->globs);
return &cloned->super;
}
AddContextualDataSelector *
add_contextual_data_glob_selector_new(LogTemplate *glob_template)
{
AddContextualDataGlobSelector *self = g_new0(AddContextualDataGlobSelector, 1);
add_contextual_data_glob_selector_init_instance(self, glob_template);
self->globs = _create_globs_array();
return &self->super;
}
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