changed the files structure to always be a linked list this is in

    prepartion for further upgrades of the code

1 files changed, 439 insertions, 1 deletions

diff --git a/NEWS b/NEWS
index 51f10d50..5fb569a6 100644
--- a/NEWS
+++ b/NEWS
@@ -1,8 +1,18 @@
 ---------------------------------------------------------------------------
+Version 0.9.0 (RGer)
+- changed the filed structure to be a linked list. Previously, it
+  was a table - well, for non-SYSV it was defined as linked list,
+  but from what I see that code did no longer work after my
+  modifications. I am now using a linked list in general because
+  that is needed for other upcoming modifications.
+- fixed a bug that caused rsyslogd not to listen to anything if
+  the configuration file could not be read
+
+---------------------------------------------------------------------------
 Version 0.8.4
 
 - improved -d debug output (removed developer-only content)
-- now compiles under FreeBSD
+- now compiles under FreeBSD and NetBSD (only quick testing done on NetBSD)
 ---------------------------------------------------------------------------
 Version 0.8.3
 
@@ -32,3 +42,431 @@ Version 0.8.0
 Initial testing release. Based on the sysklogd package. Thanks to the
 sysklogd maintainers for all their good work!
 ---------------------------------------------------------------------------
+
+----------------------------------------------------------------------
+The following comments are from the stock syslogd.c source. They provide
+some insight into what happened to the source before we forked
+rsyslogd. However, much of the code already has been replaced and more
+is to be replaced. So over time, these comments become less valuable.
+I have moved them out of the syslogd.c file to shrink it, especially
+as a lot of them do no longer apply. For historical reasons and
+understanding of how the daemon evolved, they are probably still
+helpful.
+----------------------------------------------------------------------
+/*
+ *  syslogd -- log system messages
+ *
+ * This program implements a system log. It takes a series of lines.
+ * Each line may have a priority, signified as "<n>" as
+ * the first characters of the line.  If this is
+ * not present, a default priority is used.
+ *
+ * To kill syslogd, send a signal 15 (terminate).  A signal 1 (hup) will
+ * cause it to reread its configuration file.
+ *
+ * Defined Constants:
+ *
+ * MAXLINE -- the maximum line length that can be handled.
+ * DEFUPRI -- the default priority for user messages
+ * DEFSPRI -- the default priority for kernel messages
+ *
+ * Author: Eric Allman
+ * extensive changes by Ralph Campbell
+ * more extensive changes by Eric Allman (again)
+ *
+ * Steve Lord:	Fix UNIX domain socket code, added linux kernel logging
+ *		change defines to
+ *		SYSLOG_INET	- listen on a UDP socket
+ *		SYSLOG_UNIXAF	- listen on unix domain socket
+ *		SYSLOG_KERNEL	- listen to linux kernel
+ *
+ * Mon Feb 22 09:55:42 CST 1993:  Dr. Wettstein
+ * 	Additional modifications to the source.  Changed priority scheme
+ *	to increase the level of configurability.  In its stock configuration
+ *	syslogd no longer logs all messages of a certain priority and above
+ *	to a log file.  The * wildcard is supported to specify all priorities.
+ *	Note that this is a departure from the BSD standard.
+ *
+ *	Syslogd will now listen to both the inetd and the unixd socket.  The
+ *	strategy is to allow all local programs to direct their output to
+ *	syslogd through the unixd socket while the program listens to the
+ *	inetd socket to get messages forwarded from other hosts.
+ *
+ * Fri Mar 12 16:55:33 CST 1993:  Dr. Wettstein
+ *	Thanks to Stephen Tweedie (dcs.ed.ac.uk!sct) for helpful bug-fixes
+ *	and an enlightened commentary on the prioritization problem.
+ *
+ *	Changed the priority scheme so that the default behavior mimics the
+ *	standard BSD.  In this scenario all messages of a specified priority
+ *	and above are logged.
+ *
+ *	Add the ability to specify a wildcard (=) as the first character
+ *	of the priority name.  Doing this specifies that ONLY messages with
+ *	this level of priority are to be logged.  For example:
+ *
+ *		*.=debug			/usr/adm/debug
+ *
+ *	Would log only messages with a priority of debug to the /usr/adm/debug
+ *	file.
+ *
+ *	Providing an * as the priority specifies that all messages are to be
+ *	logged.  Note that this case is degenerate with specifying a priority
+ *	level of debug.  The wildcard * was retained because I believe that
+ *	this is more intuitive.
+ *
+ * Thu Jun 24 11:34:13 CDT 1993:  Dr. Wettstein
+ *	Modified sources to incorporate changes in libc4.4.  Messages from
+ *	syslog are now null-terminated, syslogd code now parses messages
+ *	based on this termination scheme.  Linux as of libc4.4 supports the
+ *	fsync system call.  Modified code to fsync after all writes to
+ *	log files.
+ *
+ * Sat Dec 11 11:59:43 CST 1993:  Dr. Wettstein
+ *	Extensive changes to the source code to allow compilation with no
+ *	complaints with -Wall.
+ *
+ *	Reorganized the facility and priority name arrays so that they
+ *	compatible with the syslog.h source found in /usr/include/syslog.h.
+ *	NOTE that this should really be changed.  The reason I do not
+ *	allow the use of the values defined in syslog.h is on account of
+ *	the extensions made to allow the wildcard character in the
+ *	priority field.  To fix this properly one should malloc an array,
+ *	copy the contents of the array defined by syslog.h and then
+ *	make whatever modifications that are desired.  Next round.
+ *
+ * Thu Jan  6 12:07:36 CST 1994:  Dr. Wettstein
+ *	Added support for proper decomposition and re-assembly of
+ *	fragment messages on UNIX domain sockets.  Lack of this capability
+ *	was causing 'partial' messages to be output.  Since facility and
+ *	priority information is encoded as a leader on the messages this
+ *	was causing lines to be placed in erroneous files.
+ *
+ *	Also added a patch from Shane Alderton (shane@ion.apana.org.au) to
+ *	correct a problem with syslogd dumping core when an attempt was made
+ *	to write log messages to a logged-on user.  Thank you.
+ *
+ *	Many thanks to Juha Virtanen (jiivee@hut.fi) for a series of
+ *	interchanges which lead to the fixing of problems with messages set
+ *	to priorities of none and emerg.  Also thanks to Juha for a patch
+ *	to exclude users with a class of LOGIN from receiving messages.
+ *
+ *	Shane Alderton provided an additional patch to fix zombies which
+ *	were conceived when messages were written to multiple users.
+ *
+ * Mon Feb  6 09:57:10 CST 1995:  Dr. Wettstein
+ *	Patch to properly reset the single priority message flag.  Thanks
+ *	to Christopher Gori for spotting this bug and forwarding a patch.
+ *
+ * Wed Feb 22 15:38:31 CST 1995:  Dr. Wettstein
+ *	Added version information to startup messages.
+ *
+ *	Added defines so that paths to important files are taken from
+ *	the definitions in paths.h.  Hopefully this will insure that
+ *	everything follows the FSSTND standards.  Thanks to Chris Metcalf
+ *	for a set of patches to provide this functionality.  Also thanks
+ *	Elias Levy for prompting me to get these into the sources.
+ *
+ * Wed Jul 26 18:57:23 MET DST 1995:  Martin Schulze
+ *	Linux' gethostname only returns the hostname and not the fqdn as
+ *	expected in the code. But if you call hostname with an fqdn then
+ *	gethostname will return an fqdn, so we have to mention that. This
+ *	has been changed.
+ *
+ *	The 'LocalDomain' and the hostname of a remote machine is
+ *	converted to lower case, because the original caused some
+ *	inconsistency, because the (at least my) nameserver did respond an
+ *	fqdn containing of upper- _and_ lowercase letters while
+ *	'LocalDomain' consisted only of lowercase letters and that didn't
+ *	match.
+ *
+ * Sat Aug  5 18:59:15 MET DST 1995:  Martin Schulze
+ *	Now no messages that were received from any remote host are sent
+ *	out to another. At my domain this missing feature caused ugly
+ *	syslog-loops, sometimes.
+ *
+ *	Remember that no message is sent out. I can't figure out any
+ *	scenario where it might be useful to change this behavior and to
+ *	send out messages to other hosts than the one from which we
+ *	received the message, but I might be shortsighted. :-/
+ *
+ * Thu Aug 10 19:01:08 MET DST 1995:  Martin Schulze
+ *	Added my pidfile.[ch] to it to perform a better handling with
+ *	pidfiles. Now both, syslogd and klogd, can only be started
+ *	once. They check the pidfile.
+ *
+ * Sun Aug 13 19:01:41 MET DST 1995:  Martin Schulze
+ *	Add an addition to syslog.conf's interpretation. If a priority
+ *	begins with an exclamation mark ('!') the normal interpretation
+ *	of the priority is inverted: ".!*" is the same as ".none", ".!=info"
+ *	don't logs the info priority, ".!crit" won't log any message with
+ *	the priority crit or higher. For example:
+ *
+ *		mail.*;mail.!=info		/usr/adm/mail
+ *
+ *	Would log all messages of the facility mail except those with
+ *	the priority info to /usr/adm/mail. This makes the syslogd
+ *	much more flexible.
+ *
+ *	Defined TABLE_ALLPRI=255 and changed some occurrences.
+ *
+ * Sat Aug 19 21:40:13 MET DST 1995:  Martin Schulze
+ *	Making the table of facilities and priorities while in debug
+ *	mode more readable.
+ *
+ *	If debugging is turned on, printing the whole table of
+ *	facilities and priorities every hexadecimal or 'X' entry is
+ *	now 2 characters wide.
+ *
+ *	The number of the entry is prepended to each line of
+ *	facilities and priorities, and F_UNUSED lines are not shown
+ *	anymore.
+ *
+ *	Corrected some #ifdef SYSV's.
+ *
+ * Mon Aug 21 22:10:35 MET DST 1995:  Martin Schulze
+ *	Corrected a strange behavior during parsing of configuration
+ *	file. The original BSD syslogd doesn't understand spaces as
+ *	separators between specifier and action. This syslogd now
+ *	understands them. The old behavior caused some confusion over
+ *	the Linux community.
+ *
+ * Thu Oct 19 00:02:07 MET 1995:  Martin Schulze
+ *	The default behavior has changed for security reasons. The
+ *	syslogd will not receive any remote message unless you turn
+ *	reception on with the "-r" option.
+ *
+ *	Not defining SYSLOG_INET will result in not doing any network
+ *	activity, i.e. not sending or receiving messages.  I changed
+ *	this because the old idea is implemented with the "-r" option
+ *	and the old thing didn't work anyway.
+ *
+ * Thu Oct 26 13:14:06 MET 1995:  Martin Schulze
+ *	Added another logfile type F_FORW_UNKN.  The problem I ran into
+ *	was a name server that runs on my machine and a forwarder of
+ *	kern.crit to another host.  The hosts address can only be
+ *	fetched using the nameserver.  But named is started after
+ *	syslogd, so syslogd complained.
+ *
+ *	This logfile type will retry to get the address of the
+ *	hostname ten times and then complain.  This should be enough to
+ *	get the named up and running during boot sequence.
+ *
+ * Fri Oct 27 14:08:15 1995:  Dr. Wettstein
+ *	Changed static array of logfiles to a dynamic array. This
+ *	can grow during process.
+ *
+ * Fri Nov 10 23:08:18 1995:  Martin Schulze
+ *	Inserted a new tabular sys_h_errlist that contains plain text
+ *	for error codes that are returned from the net subsystem and
+ *	stored in h_errno. I have also changed some wrong lookups to
+ *	sys_errlist.
+ *
+ * Wed Nov 22 22:32:55 1995:  Martin Schulze
+ *	Added the fabulous strip-domain feature that allows us to
+ *	strip off (several) domain names from the fqdn and only log
+ *	the simple hostname. This is useful if you're in a LAN that
+ *	has a central log server and also different domains.
+ *
+ *	I have also also added the -l switch do define hosts as
+ *	local. These will get logged with their simple hostname, too.
+ *
+ * Thu Nov 23 19:02:56 MET DST 1995:  Martin Schulze
+ *	Added the possibility to omit fsyncing of logfiles after every
+ *	write. This will give some performance back if you have
+ *	programs that log in a very verbose manner (like innd or
+ *	smartlist). Thanks to Stephen R. van den Berg <srb@cuci.nl>
+ *	for the idea.
+ *
+ * Thu Jan 18 11:14:36 CST 1996:  Dr. Wettstein
+ *	Added patche from beta-testers to stop compile error.  Also
+ *	added removal of pid file as part of termination cleanup.
+ *
+ * Wed Feb 14 12:42:09 CST 1996:  Dr. Wettstein
+ *	Allowed forwarding of messages received from remote hosts to
+ *	be controlled by a command-line switch.  Specifying -h allows
+ *	forwarding.  The default behavior is to disable forwarding of
+ *	messages which were received from a remote host.
+ *
+ *	Parent process of syslogd does not exit until child process has
+ *	finished initialization process.  This allows rc.* startup to
+ *	pause until syslogd facility is up and operating.
+ *
+ *	Re-arranged the select code to move UNIX domain socket accepts
+ *	to be processed later.  This was a contributed change which
+ *	has been proposed to correct the delays sometimes encountered
+ *	when syslogd starts up.
+ *
+ *	Minor code cleanups.
+ *
+ * Thu May  2 15:15:33 CDT 1996:  Dr. Wettstein
+ *	Fixed bug in init function which resulted in file descripters
+ *	being orphaned when syslogd process was re-initialized with SIGHUP
+ *	signal.  Thanks to Edvard Tuinder
+ *	(Edvard.Tuinder@praseodymium.cistron.nl) for putting me on the
+ *	trail of this bug.  I am amazed that we didn't catch this one
+ *	before now.
+ *
+ * Tue May 14 00:03:35 MET DST 1996:  Martin Schulze
+ *	Corrected a mistake that causes the syslogd to stop logging at
+ *	some virtual consoles under Linux. This was caused by checking
+ *	the wrong error code. Thanks to Michael Nonweiler
+ *	<mrn20@hermes.cam.ac.uk> for sending me a patch.
+ *
+ * Mon May 20 13:29:32 MET DST 1996:  Miquel van Smoorenburg <miquels@cistron.nl>
+ *	Added continuation line supported and fixed a bug in
+ *	the init() code.
+ *
+ * Tue May 28 00:58:45 MET DST 1996:  Martin Schulze
+ *	Corrected behaviour of blocking pipes - i.e. the whole system
+ *	hung.  Michael Nonweiler <mrn20@hermes.cam.ac.uk> has sent us
+ *	a patch to correct this.  A new logfile type F_PIPE has been
+ *	introduced.
+ *
+ * Mon Feb 3 10:12:15 MET DST 1997:  Martin Schulze
+ *	Corrected behaviour of logfiles if the file can't be opened.
+ *	There was a bug that causes syslogd to try to log into non
+ *	existing files which ate cpu power.
+ *
+ * Sun Feb 9 03:22:12 MET DST 1997:  Martin Schulze
+ *	Modified syslogd.c to not kill itself which confuses bash 2.0.
+ *
+ * Mon Feb 10 00:09:11 MET DST 1997:  Martin Schulze
+ *	Improved debug code to decode the numeric facility/priority
+ *	pair into textual information.
+ *
+ * Tue Jun 10 12:35:10 MET DST 1997:  Martin Schulze
+ *	Corrected freeing of logfiles.  Thanks to Jos Vos <jos@xos.nl>
+ *	for reporting the bug and sending an idea to fix the problem.
+ *
+ * Tue Jun 10 12:51:41 MET DST 1997:  Martin Schulze
+ *	Removed sleep(10) from parent process.  This has caused a slow
+ *	startup in former times - and I don't see any reason for this.
+ *
+ * Sun Jun 15 16:23:29 MET DST 1997: Michael Alan Dorman
+ *	Some more glibc patches made by <mdorman@debian.org>.
+ *
+ * Thu Jan  1 16:04:52 CET 1998: Martin Schulze <joey@infodrom.north.de
+ *	Applied patch from Herbert Thielen <Herbert.Thielen@lpr.e-technik.tu-muenchen.de>.
+ *	This included some balance parentheses for emacs and a bug in
+ *	the exclamation mark handling.
+ *
+ *	Fixed small bug which caused syslogd to write messages to the
+ *	wrong logfile under some very rare conditions.  Thanks to
+ *	Herbert Xu <herbert@gondor.apana.org.au> for fiddling this out.
+ *
+ * Thu Jan  8 22:46:35 CET 1998: Martin Schulze <joey@infodrom.north.de>
+ *	Reworked one line of the above patch as it prevented syslogd
+ *	from binding the socket with the result that no messages were
+ *	forwarded to other hosts.
+ *
+ * Sat Jan 10 01:33:06 CET 1998: Martin Schulze <joey@infodrom.north.de>
+ *	Fixed small bugs in F_FORW_UNKN meachanism.  Thanks to Torsten
+ *	Neumann <torsten@londo.rhein-main.de> for pointing me to it.
+ *
+ * Mon Jan 12 19:50:58 CET 1998: Martin Schulze <joey@infodrom.north.de>
+ *	Modified debug output concerning remote receiption.
+ *
+ * Mon Feb 23 23:32:35 CET 1998: Topi Miettinen <Topi.Miettinen@ml.tele.fi>
+ *	Re-worked handling of Unix and UDP sockets to support closing /
+ *	opening of them in order to have it open only if it is needed
+ *	either for forwarding to a remote host or by receiption from
+ *	the network.
+ *
+ * Wed Feb 25 10:54:09 CET 1998: Martin Schulze <joey@infodrom.north.de>
+ *	Fixed little comparison mistake that prevented the MARK
+ *	feature to work properly.
+ *
+ * Wed Feb 25 13:21:44 CET 1998: Martin Schulze <joey@infodrom.north.de>
+ *	Corrected Topi's patch as it prevented forwarding during
+ *	startup due to an unknown LogPort.
+ *
+ * Sat Oct 10 20:01:48 CEST 1998: Martin Schulze <joey@infodrom.north.de>
+ *	Added support for TESTING define which will turn syslogd into
+ *	stdio-mode used for debugging.
+ *
+ * Sun Oct 11 20:16:59 CEST 1998: Martin Schulze <joey@infodrom.north.de>
+ *	Reworked the initialization/fork code.  Now the parent
+ *	process activates a signal handler which the daughter process
+ *	will raise if it is initialized.  Only after that one the
+ *	parent process may exit.  Otherwise klogd might try to flush
+ *	its log cache while syslogd can't receive the messages yet.
+ *
+ * Mon Oct 12 13:30:35 CEST 1998: Martin Schulze <joey@infodrom.north.de>
+ *	Redirected some error output with regard to argument parsing to
+ *	stderr.
+ *
+ * Mon Oct 12 14:02:51 CEST 1998: Martin Schulze <joey@infodrom.north.de>
+ *	Applied patch provided vom Topi Miettinen with regard to the
+ *	people from OpenBSD.  This provides the additional '-a'
+ *	argument used for specifying additional UNIX domain sockets to
+ *	listen to.  This is been used with chroot()'ed named's for
+ *	example.  See for http://www.psionic.com/papers/dns.html
+ *
+ * Mon Oct 12 18:29:44 CEST 1998: Martin Schulze <joey@infodrom.north.de>
+ *	Added `ftp' facility which was introduced in glibc version 2.
+ *	It's #ifdef'ed so won't harm with older libraries.
+ *
+ * Mon Oct 12 19:59:21 MET DST 1998: Martin Schulze <joey@infodrom.north.de>
+ *	Code cleanups with regard to bsd -> posix transition and
+ *	stronger security (buffer length checking).  Thanks to Topi
+ *	Miettinen <tom@medialab.sonera.net>
+ *	. index() --> strchr()
+ *	. sprintf() --> snprintf()
+ *	. bcopy() --> memcpy()
+ *	. bzero() --> memset()
+ *	. UNAMESZ --> UT_NAMESIZE
+ *	. sys_errlist --> strerror()
+ *
+ * Mon Oct 12 20:22:59 CEST 1998: Martin Schulze <joey@infodrom.north.de>
+ *	Added support for setutent()/getutent()/endutend() instead of
+ *	binary reading the UTMP file.  This is the the most portable
+ *	way.  This allows /var/run/utmp format to change, even to a
+ *	real database or utmp daemon. Also if utmp file locking is
+ *	implemented in libc, syslog will use it immediately.  Thanks
+ *	to Topi Miettinen <tom@medialab.sonera.net>.
+ *
+ * Mon Oct 12 20:49:18 MET DST 1998: Martin Schulze <joey@infodrom.north.de>
+ *	Avoid logging of SIGCHLD when syslogd is in the process of
+ *	exiting and closing its files.  Again thanks to Topi.
+ *
+ * Mon Oct 12 22:18:34 CEST 1998: Martin Schulze <joey@infodrom.north.de>
+ *	Modified printline() to support 8bit characters - such as
+ *	russion letters.  Thanks to Vladas Lapinskas <lapinskas@mail.iae.lt>.
+ *
+ * Sat Nov 14 02:29:37 CET 1998: Martin Schulze <joey@infodrom.north.de>
+ *	``-m 0'' now turns of MARK logging entirely.
+ *
+ * Tue Jan 19 01:04:18 MET 1999: Martin Schulze <joey@infodrom.north.de>
+ *	Finally fixed an error with `-a' processing, thanks to Topi
+ *	Miettinen <tom@medialab.sonera.net>.
+ *
+ * Sun May 23 10:08:53 CEST 1999: Martin Schulze <joey@infodrom.north.de>
+ *	Removed superflous call to utmpname().  The path to the utmp
+ *	file is defined in the used libc and should not be hardcoded
+ *	into the syslogd binary referring the system it was compiled on.
+ *
+ * Sun Sep 17 20:45:33 CEST 2000: Martin Schulze <joey@infodrom.ffis.de>
+ *	Fixed some bugs in printline() code that did not escape
+ *	control characters '\177' through '\237' and contained a
+ *	single-byte buffer overflow.  Thanks to Solar Designer
+ *	<solar@false.com>.
+ *
+ * Sun Sep 17 21:26:16 CEST 2000: Martin Schulze <joey@infodrom.ffis.de>
+ *	Don't close open sockets upon reload.  Thanks to Bill
+ *	Nottingham.
+ *
+ * Mon Sep 18 09:10:47 CEST 2000: Martin Schulze <joey@infodrom.ffis.de>
+ *	Fixed bug in printchopped() that caused syslogd to emit
+ *	kern.emerg messages when splitting long lines.  Thanks to
+ *	Daniel Jacobowitz <dan@debian.org> for the fix.
+ *
+ * Mon Sep 18 15:33:26 CEST 2000: Martin Schulze <joey@infodrom.ffis.de>
+ *	Removed unixm/unix domain sockets and switch to Datagram Unix
+ *	Sockets.  This should remove one possibility to play DoS with
+ *	syslogd.  Thanks to Olaf Kirch <okir@caldera.de> for the patch.
+ *
+ * Sun Mar 11 20:23:44 CET 2001: Martin Schulze <joey@infodrom.ffis.de>
+ *	Don't return a closed fd if `-a' is called with a wrong path.
+ *	Thanks to Bill Nottingham <notting@redhat.com> for providing
+ *	a patch.
+ */