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|
/**************************************
**
** PARSER RULES
**
** (a) must set record->host
** (eventually to dummy value)
**
** (b) must set record->prefix
** (eventually to dummy value)
**
**
**************************************/
/* for strptime */
#define _XOPEN_SOURCE
#include "config_xor.h"
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#if defined(HOST_IS_SOLARIS)
/* For 'struct timeval' in <sys/time.h> */
#define __EXTENSIONS__
#endif
#include <sys/types.h>
#include <time.h>
#ifdef USE_LOGFILE_MONITOR
#include "samhain.h"
#include "sh_pthread.h"
#include "sh_log_check.h"
#include "sh_utils.h"
#include "sh_string.h"
#undef FIL__
#define FIL__ _("sh_log_parse_syslog.c")
static int hidepid = 0;
extern int flag_err_debug;
int sh_get_hidepid()
{
return hidepid;
}
int sh_set_hidepid(const char *s)
{
return sh_util_flagval(s, &hidepid);
}
struct sh_logrecord * sh_parse_syslog (sh_string * logline, void * fileinfo)
{
static const char * format0_1 = N_("%b %d %T");
static const char * format0_2 = N_("%Y-%m-%dT%T");
static char format_1[16];
static char format_2[16];
static int format_init = 0;
static struct tm old_tm;
static time_t old_time;
const unsigned int Tpos = 10;
volatile unsigned int tlen = 16;
(void) fileinfo;
if (!format_init)
{
sl_strlcpy(format_1, _(format0_1), sizeof(format_1));
sl_strlcpy(format_2, _(format0_2), sizeof(format_2));
format_init = 1;
}
if (flag_err_debug == S_TRUE && sh_string_len(logline) > 0)
{
SH_MUTEX_LOCK(mutex_thread_nolog);
sh_error_handle(SH_ERR_ALL, FIL__, __LINE__, 0, MSG_E_SUBGEN,
logline->str,
_("sh_parse_syslog"));
SH_MUTEX_UNLOCK(mutex_thread_nolog);
}
if (logline && sh_string_len(logline) > tlen)
{
struct tm btime;
char * ptr;
int flag;
size_t lengths[3];
memset(&btime, 0, sizeof(struct tm));
btime.tm_isdst = -1;
/* This is RFC 3164.
*/
if (logline->str[Tpos] != 'T')
{
logline->str[tlen-1] = '\0';
ptr = /*@i@*/strptime(logline->str, format_1, &btime);
}
/* RFC 3339 describes an alternative timestamp format.
* Unfortunately, POSIX strptime() does not support reading
* the TZ offset.
*/
else
{
ptr = strptime(logline->str, format_2, &btime);
if (ptr)
{
tlen = 20;
if (*ptr && *ptr != ' ') {
do { ++ptr; ++tlen; } while (*ptr && *ptr != ' ');
if (*ptr == ' ') *ptr = '\0';
}
}
}
if (ptr && *ptr == '\0') /* no error, whole string consumed */
{
unsigned int fields = 3; /* host program(\[pid\])+: message */
char ** array = split_array_ws(&(logline->str[tlen]), &fields, lengths);
if (fields == 3)
{
struct sh_logrecord * record = SH_ALLOC(sizeof(struct sh_logrecord));
record->timestamp = conv_timestamp(&btime, &old_tm, &old_time);
record->timestr = sh_string_new_from_lchar(logline->str, (tlen-1));
/* host
*/
record->host = sh_string_new_from_lchar(array[0], lengths[0]);
/* program and pid
*/
if (NULL != (ptr = strchr(array[1], '[')))
{
*ptr = '\0';
++ptr;
record->pid = (pid_t) atoi(ptr);
if (hidepid == 0 || !*ptr) {
--ptr;
*ptr = '[';
} else {
*ptr = '\0'; /* overwrite first digit */
--ptr;
*ptr = ':'; /* overwrite ex-':' */
lengths[1] = strlen(array[1]);
}
}
else
{
flag = 0;
ptr = array[1];
if (ptr[lengths[1]] == ':') {
ptr[lengths[1]] = '\0';
flag = 1;
}
record->pid = PID_INVALID;
if (flag == 1) {
ptr[lengths[1]] = ':';
}
}
/* message
*/
record->message = sh_string_new_from_lchar3(array[1], lengths[1],
" ", 1,
array[2], lengths[2]);
SH_FREE(array);
return record;
}
SH_FREE(array);
}
}
/* corrupted logline
*/
return NULL;
}
/* USE_LOGFILE_MONITOR */
#endif
|
