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/*
* Copyright (c) 2018 Balabit
*
* 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 "logline_generator.h"
#include "loggen_helper.h"
#include <stdio.h>
#include <string.h>
#include <time.h>
#include <unistd.h>
#include <sys/time.h>
#include <sys/types.h>
#include <glib.h>
static char line_buf_template[MAX_MESSAGE_LENGTH + 1];
static int pos_timestamp1 = 0;
static int pos_timestamp2 = 0;
static int pos_seq = 0;
static int pos_thread_id = 0;
int
prepare_log_line_template(int syslog_proto, int framing, int message_length, char *sdata_value)
{
int linelen = 0;
char padding[] = "PADD";
int hdr_len = 0;
struct timeval now;
gettimeofday(&now, NULL);
int run_id = now.tv_sec;
int buffer_length = sizeof(line_buf_template);
if (framing)
hdr_len = snprintf(line_buf_template, buffer_length, "%d ", message_length);
else
hdr_len = 0;
if (syslog_proto)
{
const char *sdata = sdata_value ? sdata_value : "-";
linelen = snprintf(line_buf_template + hdr_len, buffer_length - hdr_len,
"<38>1 2007-12-24T12:28:51+02:00 localhost prg%05d 1234 - %s \xEF\xBB\xBFseq: %010d, thread: %04d, runid: %-10d, stamp: %-19s ",
0, sdata, 0, 0, run_id, "");
pos_timestamp1 = 6 + hdr_len;
pos_seq = 68 + hdr_len + strlen(sdata) - 1;
pos_thread_id = pos_seq + 20;
pos_timestamp2 = 120 + hdr_len + strlen(sdata) - 1;
}
else
{
linelen = snprintf(line_buf_template + hdr_len, buffer_length - hdr_len,
"<38>2007-12-24T12:28:51 localhost prg%05d[1234]: seq: %010d, thread: %04d, runid: %-10d, stamp: %-19s ", 0, 0,
0, run_id, "");
pos_timestamp1 = 4 + hdr_len;
pos_seq = 55 + hdr_len;
pos_thread_id = pos_seq + 20;
pos_timestamp2 = 107 + hdr_len;
}
if (linelen > message_length)
{
ERROR("warning: message length is too small, the minimum is %d bytes\n", linelen);
return 0;
}
for (int i = linelen; i < message_length - 1; i++)
{
line_buf_template[i + hdr_len] = padding[(i - linelen) % (sizeof(padding) - 1)];
}
line_buf_template[hdr_len + message_length - 1] = '\n';
line_buf_template[hdr_len + message_length] = 0;
return linelen;
}
int
generate_log_line(char *buffer, int buffer_length, int syslog_proto, int thread_id, unsigned long seq)
{
if (!buffer)
{
ERROR("invalid buffer\n");
return -1;
}
/* make a copy of logline template */
memcpy(buffer, line_buf_template, buffer_length < MAX_MESSAGE_LENGTH ? buffer_length : MAX_MESSAGE_LENGTH);
/* create time stamps */
struct timeval now;
gettimeofday(&now, NULL);
struct tm tm;
char stamp[32];
localtime_r(&now.tv_sec, &tm);
int len = strftime(stamp, sizeof(stamp), "%Y-%m-%dT%H:%M:%S", &tm);
memcpy(&buffer[pos_timestamp2], stamp, len);
if (syslog_proto)
format_timezone_offset_with_colon(stamp, sizeof(stamp), &tm);
memcpy(&buffer[pos_timestamp1], stamp, strlen(stamp));
/* print sequence number to logline */
char intbuf[16];
snprintf(intbuf, sizeof(intbuf), "%010ld", seq);
memcpy(&buffer[pos_seq], intbuf, 10);
/* print thread id */
char thread_id_buff[5];
snprintf(thread_id_buff, sizeof(thread_id_buff), "%04d", thread_id);
memcpy(&buffer[pos_thread_id], thread_id_buff, 4);
return strlen(buffer);
}
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