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/*
* Copyright (c) 2017 Balabit
*
* 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 "plugin.h"
#include "plugin-types.h"
#include "template/simple-function.h"
#include "messages.h"
#include "cfg.h"
#include "syslog-ng-config.h"
#include <stdlib.h>
#include <math.h>
static gboolean
_is_leap_year(int year)
{
return ((year%4==0) && (year % 100!=0)) || (year%400==0);
}
static time_t
year_in_seconds(int year)
{
if (_is_leap_year(year))
return 31622400;
else
return 31536000;
}
typedef struct
{
TFSimpleFuncState super;
int precision;
} TFStardateState;
static guint64 power10[10] = { 1, 10, 100, 1000, 10000,
100000, 1000000, 10000000, 100000000, 1000000000
};
gboolean
tf_stardate_prepare(LogTemplateFunction *self, gpointer s, LogTemplate *parent,
gint argc, gchar *argv[], GError **error)
{
TFStardateState *state = (TFStardateState *) s;
state->precision = 2;
GOptionEntry stardate_options[] =
{
{ "digits", 'd', 0, G_OPTION_ARG_INT, &state->precision, "Precision: 0-9. Default: 2.", NULL },
{ NULL }
};
GOptionContext *ctx = g_option_context_new("stardate");
g_option_context_add_main_entries(ctx, stardate_options, NULL);
if (!g_option_context_parse(ctx, &argc, &argv, error))
{
g_option_context_free(ctx);
return FALSE;
}
g_option_context_free(ctx);
if (state->precision < 0 || state->precision > 9)
{
g_set_error(error, LOG_TEMPLATE_ERROR, LOG_TEMPLATE_ERROR_COMPILE,
"stardate: digits must be between 0-9.\n");
return FALSE;
}
if (argc != 2)
{
g_set_error(error, LOG_TEMPLATE_ERROR, LOG_TEMPLATE_ERROR_COMPILE,
"stardate: format must be: $(stardate [--digits 2] $UNIXTIME)\n");
return FALSE;
}
if (!tf_simple_func_prepare(self, state, parent, argc, argv, error))
{
g_set_error(error, LOG_TEMPLATE_ERROR, LOG_TEMPLATE_ERROR_COMPILE,
"stardate: stardate: prepare failed");
return FALSE;
}
return TRUE;
}
static void
tf_stardate_call(LogTemplateFunction *self, gpointer s,
const LogTemplateInvokeArgs *args, GString *result, LogMessageValueType *type)
{
TFStardateState *state = (TFStardateState *) s;
char *status;
time_t time_to_convert = strtol(args->argv[0]->str, &status, 10);
*type = LM_VT_STRING;
if (*status)
{
msg_error("stardate: wrong format: expected unixtime like value",
evt_tag_str("got:", args->argv[0]->str));
return;
}
struct tm tm_time;
localtime_r(&time_to_convert, &tm_time );
struct tm secs_beginning_year = {.tm_year = tm_time.tm_year, .tm_mday = 1};
time_t elapsed_seconds = time_to_convert - mktime(&secs_beginning_year);
double fraction = (double)elapsed_seconds/year_in_seconds(tm_time.tm_year);
double truncated = (double) floor(fraction * power10[state->precision]) / power10[state->precision];
g_string_append_printf(result, "%0.*lf", state->precision, 1900 + tm_time.tm_year + truncated);
}
TEMPLATE_FUNCTION(TFStardateState, tf_stardate, tf_stardate_prepare,
tf_simple_func_eval, tf_stardate_call, tf_simple_func_free_state, NULL);
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