This may cause a bit of a regression for some users, but the RFC is
crystal clear on this point, the tag MUST NOT exceed 32 characters.
Signed-off-by: Joachim Wiberg <troglobit@gmail.com>
This is the first RFC5424 (only) support for for logging to a remote
host. The syntax continues to follow the FreeBSD logger.
Signed-off-by: Joachim Wiberg <troglobit@gmail.com>
As reported on GitHub. When logging to a remote host, after a few
SIGHUP's we get the following log message:
Only 16 IP addresses per socket supported.
When closing all currently open sockets, the socket count must be reset
to allow for opening new ones, otherwise we'll run out of "counts".
Yes, this should be refactored to use the FreeBSD model implementation.
Problem introduced in v2.4.0, commit 075815e.
Signed-off-by: Joachim Wiberg <troglobit@gmail.com>
Do not corrupt logfiles when kernel messages contain control codes,
notably \n. Instead, preserve the kernel's protective C-style hex
encoding. For example, \n embedded in a message by a kernel-level
facility is received as "\x0a". Kernel-level facilities cannot be
trusted to use only syslog-safe codes in kernel messages. See:
<https://kernel.org/doc/Documentation/ABI/testing/dev-kmsg>
This change avoids the possibility of advancing past the null
terminator, by always testing the value at the pointer before
advancing the pointer.
While repairing this, I reconciled the code sections that read the
priority, sequence, and timestamp, so that they handle the pointer in
exactly the same way. This makes the source easier to maintain.
Only to clean up, possibly relevant for no-MMU systems, but
they have other issues as well (e.g. fork) that prevent them
from using the sysklogd project.
Signed-off-by: Joachim Wiberg <troglobit@gmail.com>
Logic for secure mode setting in .conf file
- Command line always wins
- SIGHUP activates changes
Note, if -s is given on command line it always wins, regardless.
Signed-off-by: Joachim Wiberg <troglobit@gmail.com>
This is redundant and causes message truncation. The <PRI> field is
skipped within wallmsg() itself.
Signed-off-by: Edward K. McGuire <metaed@gmail.com>
Signed-off-by: Joachim Wiberg <troglobit@gmail.com>
This patch allows the user to disable the 8-bit data check in the log
message validator. If you have experienced problems with logging any
unicode (utf-8) messages after v1.6, this option is for you.
The correct way to handle this is to add proper parser support for the
Unicode BOM, defined in RFC5424[1], as NetBSD syslogd does[2], search
for IS_BOM().
[1]: https://datatracker.ietf.org/doc/html/rfc5424#appendix-A.8
[2]: http://cvsweb.netbsd.org/bsdweb.cgi/src/usr.sbin/syslogd/syslogd.c?rev=1.138
Signed-off-by: Joachim Wiberg <troglobit@gmail.com>
This patch adds a very rudimentary container check. When one, of a
select few containers, are detected, sysklogd disables the kernel
logging -- since there's no point in logging kernel messages other
than from the host system.
Issue #48
Signed-off-by: Joachim Wiberg <troglobit@gmail.com>
This patch adds support for disabling kernel logging, opensys(). This
is in addition to the character device validation check, and primarily
for use in container use-cases -- where logging kernel is not needed.
Signed-off-by: Joachim Wiberg <troglobit@gmail.com>
Issue #48 describes a problem with 100% CPU load in a container
use-case. Turns out one of the issues was that /dev/kmsg was
not a proper character device. This patch adds a very basic
check to ensure /dev/kmsg is usable.
Signed-off-by: Joachim Wiberg <troglobit@gmail.com>
We need the '-K' option to disable kernel logging, so this option needs
to be renamed, unfortunately. Fortunately it's not been released yet.
Issue #42
Signed-off-by: Joachim Wiberg <troglobit@gmail.com>
When entering the forwarding suspend timer, free any previous address
info and do a new DNS lookup when the timer elapses. The failure to
send may be because we're using a stale IP address.
Signed-off-by: Joachim Wiberg <troglobit@gmail.com>
This patch replaces the INET_SUSPEND_TIME for DNS lookup with a 5 sec
back-off to prevent DNS lookup on each message.
Also, reorder WARN() and NOTE() so they are called *after* setting the
f_type, otherwise we unleash endless recursive loops.
To avoid filling up the log with "Failed resolving ..." messages every
time we retry, we set a flag to remember we've already logged warning.
Signed-off-by: Joachim Wiberg <troglobit@gmail.com>
When time_t wraps around on 32-bit UNIX systems we shouldn't assert (and
cause syslogd to be continously restarted) but instead try to handle the
wraparound more gracefully.
This change, initially proposed by Raul Porancea, checks for wraparound
and allows syslogd to continue on error. Logging with invalid date is
better than no logs at all. Thanks Raul for tracking this one down!
Signed-off-by: Joachim Wiberg <troglobit@gmail.com>
Turns out that gettimeofday() can return EOVERFLOW on systems with
32-bit time_t. This occurs when the UNIX Epoch wraps around, the
exact time is 03:14:07 UTC on 19 January 2038.
EOVERFLOW is not documented in gettimeofday(2), but instead of messing
up the entire syslog message -- causing syslogd to drop it -- we can
handle the overflow by falling back to time(NULL) (returning seconds
since start of Epoch) and rely on syslogd to, in turn, handle the
wraparound gracefully.
Signed-off-by: Joachim Wiberg <troglobit@gmail.com>
The logit() function winds up calling vfprintf(), GLIBC is friendly
enough to check for NULL and replace segfault with "(null)", but other
C-libs may not handle it as gracefully.
Signed-off-by: Joachim Wiberg <troglobit@gmail.com>
