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/* SPDX-License-Identifier: ISC */
#include <stddef.h>
#include <string.h>
#include <ctype.h>
#include <time.h>
#include "syslogd.h"
static const char *months[] = {
"Jan", "Feb", "Mar", "Apr",
"May", "Jun", "Jul", "Aug",
"Sep", "Oct", "Nov", "Dec"
};
static const int days[12] = { 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 };
static int isleap(int year)
{
return ((year % 4 == 0) && (year % 100 != 0)) || ((year % 400) == 0);
}
static int mdays(int year, int month)
{
return (isleap(year) && month == 2) ? 29 : days[month - 1];
}
static char *read_num(char *str, int *out, int maxval)
{
if (str == NULL || !isdigit(*str))
return NULL;
for (*out = 0; isdigit(*str); ++str) {
(*out) = (*out) * 10 + (*str) - '0';
if ((*out) > maxval)
return NULL;
}
return str;
}
static char *skip_space(char *str)
{
if (str == NULL || !isspace(*str))
return NULL;
while (isspace(*str))
++str;
return str;
}
static char *read_date_bsd(char *str, struct tm *tm)
{
int year, month, day, hour, minute, second;
time_t t;
/* decode date */
for (month = 0; month < 12; ++month) {
if (strncmp(str, months[month], 3) == 0) {
str = skip_space(str + 3);
break;
}
}
str = read_num(str, &day, 31);
str = skip_space(str);
t = time(NULL);
if (localtime_r(&t, tm) == NULL)
return NULL;
year = tm->tm_year;
/* sanity check */
if (str == NULL || month >= 12 || day < 1)
return NULL;
if (month == 11 && tm->tm_mon == 0)
--year;
if (day > mdays(year + 1900, month + 1))
return NULL;
/* decode time */
str = read_num(str, &hour, 23);
if (str == NULL || *(str++) != ':')
return NULL;
str = read_num(str, &minute, 59);
if (str == NULL || *(str++) != ':')
return NULL;
str = read_num(str, &second, 59);
str = skip_space(str);
/* store result */
memset(tm, 0, sizeof(*tm));
tm->tm_sec = second;
tm->tm_min = minute;
tm->tm_hour = hour;
tm->tm_mday = day;
tm->tm_mon = month;
tm->tm_year = year;
return str;
}
static char *decode_priority(char *str, int *priority)
{
while (isspace(*str))
++str;
if (*(str++) != '<')
return NULL;
str = read_num(str, priority, 23 * 8 + 7);
if (str == NULL || *(str++) != '>')
return NULL;
while (isspace(*str))
++str;
return str;
}
int syslog_msg_parse(syslog_msg_t *msg, char *str)
{
char *ident, *ptr;
struct tm tstamp;
pid_t pid = 0;
int priority;
size_t len;
memset(msg, 0, sizeof(*msg));
str = decode_priority(str, &priority);
if (str == NULL)
return -1;
msg->facility = priority >> 3;
msg->level = priority & 0x07;
str = read_date_bsd(str, &tstamp);
if (str == NULL)
return -1;
ident = str;
while (*str != '\0' && *str != ':')
++str;
if (*str == ':') {
*(str++) = '\0';
while (isspace(*str))
++str;
ptr = ident;
while (*ptr != '[' && *ptr != '\0')
++ptr;
if (*ptr == '[') {
*(ptr++) = '\0';
while (isdigit(*ptr))
pid = pid * 10 + *(ptr++) - '0';
}
} else {
ident = NULL;
}
if (ident != NULL && ident[0] == '\0')
ident = NULL;
msg->timestamp = mktime(&tstamp);
msg->pid = pid;
msg->ident = ident;
msg->message = str;
len = strlen(str);
while (len > 0 && isspace(str[len - 1]))
--len;
str[len] = '\0';
if (ident != NULL) {
for (ptr = ident; *ptr != '\0'; ++ptr) {
if (!isalnum(*ptr))
*ptr = '_';
}
}
return 0;
}
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