Slight differences in output when called with `-v` flag:
- Should output to stdout, that's what people expect (not an error)
- Should output *project* name and version, for syslogd this is not
so obvious since it *logs* 'syslogd vx.y.z' while the version is
'sysklogd vx.y.z'
Signed-off-by: Joachim Wiberg <troglobit@gmail.com>
When logging to a file we want a space to separate proc[pid]: from the
message, but for regular logging local/remote we don't want to inject
an extra space.
Signed-off-by: Joachim Wiberg <troglobit@gmail.com>
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>
No need to advertise that sysklogd is not kept up-to-date in all the
distros on the planet. Nothing much I can do about it.
Signed-off-by: Joachim Wiberg <troglobit@gmail.com>
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>
This disables the "unauthenticated remote disk-filling service" by
default. A user can easily change this to 0 (or 2) to allow other
systems to log to their syslogd.
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>
Many projects use sysklogd with the shipped syslog.conf as their own
default /etc/syslog.conf. This is fine of course, but for many small
embedded systems getting all debug messages in the log by default is not
desirable.
This change drops debug messages from /var/log/syslog by default and
recommends admins to use /var/log/debug, or drop the debug filter.
Signed-off-by: Joachim Wiberg <troglobit@gmail.com>
This patch refactors the way the primary and secondary syslogd is
started by the test framework. The generalizations not only make the
code more readable, it hopefully also makes it easier to add new tests
in the future.
Signed-off-by: Joachim Wiberg <troglobit@gmail.com>
The usage text (syslogd -?) and the syslogd.8 man page was not in sync
wrt. the -b option. This patch updates it to match the layout of -a,
the -a option is also slightly updated.
Signed-off-by: Joachim Wiberg <troglobit@gmail.com>
Since we currently cannot test kernel logging, and we don't want to risk
any log messages from the kernel to suddenly pop up and disturb tests,
this patch explicitly disables it.
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>
The spec[1] says the /dev/kmsg timestamp is a monotonic clock and in
microseconds. After a while you realize it's also relative to the boot
of the system, that fact was probably too obvious to be put in the spec.
However, what's *not* in the spec, and what takes a while to realize, is
that this monotonic time is *not* adjusted for suspend/resume cycles ...
On a frequently used laptop this can manifest itself as follows. The
kernel is stuck on Nov 15, and for the life of me I cannot find any to
adjust for this offset:
$ dmesg -T |tail -1; date
[Mon Nov 15 01:42:08 2021] wlan0: Limiting TX power to 23 (23 - 0) dBm as advertised by 18:e8:29:55:b0:62
Tue 23 Nov 2021 05:20:53 PM CET
Hence this patch. After initial "emptying" of /dev/kmsg when syslogd
starts up, we raise a flag (denoting done with backlog), and after this
point we ignore the kernel's idea of time and replace it with the actual
time we have now, the same that userspace messages are logged with.
Sure, there will be occasions where there's a LOT of kernel messages to
read and we won't be able to keep track. Yet, this patch is better than
the current state (where we log Nov 15).
[1]: https://www.kernel.org/doc/Documentation/ABI/testing/dev-kmsg
Signed-off-by: Joachim Wiberg <troglobit@gmail.com>
Joachim Wiberg