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sysklogd: add timestamp option to ignore message timestamps

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Some syslog producers provide inconsistent timestamps, so provide an option
to ignore the message timestamps and always locally timestamp.  In order to
implement this, invert the valid-timestamp check, but only use the timestamp
if this option is not enabled.

This is in line with what what other syslogd implementations do:

From sysklogd syslogd.c:
 * Sun Nov  7 12:28:47 CET 2004: Martin Schulze <joey@infodrom.org>
 *      Discard any timestamp information found in received syslog
 *      messages.  This will affect local messages sent from a
 *      different timezone.

rsyslog's imuxsock module similary has an (enabled by default)
IgnoreTimestamp option:

https://www.rsyslog.com/doc/v8-stable/configuration/modules/imuxsock.html

function                                             old     new   delta
packed_usage                                       32877   32912     +35
timestamp_and_log                                    363     376     +13
syslogd_main                                        1638    1641      +3
------------------------------------------------------------------------------
(add/remove: 0/0 grow/shrink: 3/0 up/down: 51/0)               Total: 51 bytes

Signed-off-by: Peter Korsgaard <peter@korsgaard.com>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
This commit is contained in:
Peter Korsgaard 2018-08-09 11:25:22 +02:00 committed by Denys Vlasenko
parent 6791140123
commit 9d539f9fbd
1 changed files with 18 additions and 9 deletions
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27
sysklogd/syslogd.c
View File

@ -140,6 +140,7 @@
//usage: )
//usage: "\n -l N Log only messages more urgent than prio N (1-8)"
//usage: "\n -S Smaller output"
//usage: "\n -t Strip client-generated timestamps"
//usage: IF_FEATURE_SYSLOGD_DUP(
//usage: "\n -D Drop duplicates"
//usage: )
@ -316,6 +317,7 @@ enum {
OPTBIT_outfile, // -O
OPTBIT_loglevel, // -l
OPTBIT_small, // -S
OPTBIT_timestamp, // -t
IF_FEATURE_ROTATE_LOGFILE(OPTBIT_filesize ,) // -s
IF_FEATURE_ROTATE_LOGFILE(OPTBIT_rotatecnt ,) // -b
IF_FEATURE_REMOTE_LOG( OPTBIT_remotelog ,) // -R
@ -330,6 +332,7 @@ enum {
OPT_outfile = 1 << OPTBIT_outfile ,
OPT_loglevel = 1 << OPTBIT_loglevel,
OPT_small = 1 << OPTBIT_small ,
OPT_timestamp = 1 << OPTBIT_timestamp,
OPT_filesize = IF_FEATURE_ROTATE_LOGFILE((1 << OPTBIT_filesize )) + 0,
OPT_rotatecnt = IF_FEATURE_ROTATE_LOGFILE((1 << OPTBIT_rotatecnt )) + 0,
OPT_remotelog = IF_FEATURE_REMOTE_LOG( (1 << OPTBIT_remotelog )) + 0,
@ -339,7 +342,7 @@ enum {
OPT_cfg = IF_FEATURE_SYSLOGD_CFG( (1 << OPTBIT_cfg )) + 0,
OPT_kmsg = IF_FEATURE_KMSG_SYSLOG( (1 << OPTBIT_kmsg )) + 0,
};
#define OPTION_STR "m:nO:l:S" \
#define OPTION_STR "m:nO:l:St" \
IF_FEATURE_ROTATE_LOGFILE("s:" ) \
IF_FEATURE_ROTATE_LOGFILE("b:" ) \
IF_FEATURE_REMOTE_LOG( "R:*") \
@ -813,21 +816,27 @@ static void parse_fac_prio_20(int pri, char *res20)
* that there is no timestamp, short-circuiting the test. */
static void timestamp_and_log(int pri, char *msg, int len)
{
char *timestamp;
char *timestamp = NULL;
time_t now;
/* Jan 18 00:11:22 msg... */
/* 01234567890123456 */
if (len < 16 || msg[3] != ' ' || msg[6] != ' '
|| msg[9] != ':' || msg[12] != ':' || msg[15] != ' '
if (len >= 16 && msg[3] == ' ' && msg[6] == ' '
&& msg[9] == ':' && msg[12] == ':' && msg[15] == ' '
) {
time(&now);
timestamp = ctime(&now) + 4; /* skip day of week */
} else {
now = 0;
timestamp = msg;
if (!(option_mask32 & OPT_timestamp)) {
/* use message timestamp */
timestamp = msg;
now = 0;
}
msg += 16;
}
if (!timestamp) {
time(&now);
timestamp = ctime(&now) + 4; /* skip day of week */
}
timestamp[15] = '\0';
if (option_mask32 & OPT_kmsg) {