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do not assume constant year based on file index

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rather start with the current time at invocation and if the month in
the log is larger assume a year-wrap happened between logwriting and
invocation.

the old logic is flawed (but that can be said about parsing
traditional syslog timestamps (w/o year) in general) - it got worse
with the change in bullseye of rotating syslog weekly by default -
resulting in users losing one week of logs per day in the new year as
reported in https://forum.proxmox.com/threads/.102322/

Reviewed-by: Wolfgang Bumiller <w.bumiller@proxmox.com>
Signed-off-by: Stoiko Ivanov <s.ivanov@proxmox.com>
This commit is contained in:
Stoiko Ivanov 2022-01-03 17:09:54 +01:00
parent 6d693ce164
commit 1cdbebe57b
1 changed files with 15 additions and 24 deletions
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39
src/main.rs
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@ -1722,7 +1722,7 @@ struct Parser {
current_record_state: RecordState,
rel_line_nr: u64,
current_year: [i64; 32],
current_year: i64,
current_month: i64,
current_file_index: usize,
@ -1743,14 +1743,7 @@ struct Parser {
impl Parser {
fn new() -> Self {
let mut years: [i64; 32] = [0; 32];
for (i, year) in years.iter_mut().enumerate() {
let mut ts = time::get_time();
ts.sec -= (3600 * 24 * i) as i64;
let ltime = time::at(ts);
*year = (ltime.tm_year + 1900) as i64;
}
let ltime = time::now();
Self {
sentries: HashMap::new(),
@ -1760,8 +1753,8 @@ impl Parser {
smtp_tls_log_by_pid: HashMap::new(),
current_record_state: Default::default(),
rel_line_nr: 0,
current_year: years,
current_month: 0,
current_year: (ltime.tm_year + 1900) as i64,
current_month: ltime.tm_mon as i64,
current_file_index: 0,
count: 0,
buffered_stdout: BufWriter::with_capacity(4 * 1024 * 1024, std::io::stdout()),
@ -1848,8 +1841,8 @@ impl Parser {
let (time, line) = match parse_time(
line,
self.current_year[self.current_file_index],
&mut self.current_month,
self.current_year,
self.current_month,
) {
Some(t) => t,
None => continue,
@ -1938,8 +1931,8 @@ impl Parser {
}
if let Some((time, _)) = parse_time(
&buffer[0..size],
self.current_year[i],
&mut self.current_month,
self.current_year,
self.current_month,
) {
// found the earliest file in the time frame
if time < self.options.start {
@ -1957,8 +1950,8 @@ impl Parser {
}
if let Some((time, _)) = parse_time(
&buffer[0..size],
self.current_year[i],
&mut self.current_month,
self.current_year,
self.current_month,
) {
if time < self.options.start {
break;
@ -2285,7 +2278,7 @@ fn parse_number(data: &[u8], max_digits: usize) -> Option<(usize, &[u8])> {
fn parse_time<'a>(
data: &'a [u8],
cur_year: i64,
cur_month: &mut i64,
cur_month: i64,
) -> Option<(libc::time_t, &'a [u8])> {
if data.len() < 15 {
return None;
@ -2311,19 +2304,17 @@ fn parse_time<'a>(
let mut ltime: libc::time_t;
let mut year = cur_year;
if *cur_month == 11 && mon == 0 {
year += 1;
}
if mon > *cur_month {
*cur_month = mon;
// assume smaller month now than in log line means yearwrap
if cur_month < mon {
year -= 1;
}
ltime = (year - 1970) * 365 + CAL_MTOD[mon as usize];
// leap year considerations
if mon <= 1 {
year -= 1;
}
ltime += (year - 1968) / 4;
ltime -= (year - 1900) / 100;
ltime += (year - 1600) / 400;