$Id: CHANGES,v 1.30 1999/04/27 02:45:03 trockij Exp $

Changes between mon-0.38.9 and mon-0.38.10
---------------------------------------------

-Fixed a bug where call_alert didn't set _last_alert correctly,
 thus causing things like alertevery to not work properly.

-Small bug fix in handle_trap_timeout

-Removed some debugging junk for dtlogging

-A few code cleanups here and there

-Fixed @groupargs problem in call_alert


Changes between mon-0.38.8 and mon-0.38.9
---------------------------------------------

-Removed %var% substitution in favor of -M, which pre-processes the config
 file with m4. Macro expansion should be handled by software whose sole
 purpose is to perform macro expansion, hence m4.

-Added an "example.m4" in the etc/ directory.

-Added "fail" trap.

-Pass _op_status value to alerts via env variable MON_OPSTATUS.

-Updated file.alert to log MON_OPSTATUS.

-Fixed bug in client buffer handling where a blank line submitted by
 the client would prevent all future commands from being processed.

-The server no longer disconnects the client on an invalid command.

-Added "--disabled" and "--state" commands to monshow. Showing disabled
 hosts is no longer the default. The defaults can be set in ~/.monshowrc.
 This requires the latest Perl module (Mon-0.4). Also added "--old" option.

-Added man page for monshow.

-Updated some docs in mon.1

-Don't complain if userfile does not exist and the authtype is not userfile.

-Patched in Gilles' historicfile stuff, and documented it in mon.1, and fixed
 some bugs.

-Alerts are no longer called with -l parameter. It's never been documented,
 and no alerts use it, so I'm ditching it.

-version command returns a value like "0.38.9" rather than a float.

-Separated alert calling function from the function which determines
 if an alert should be called.

-Alerts are now forked with a separate environment than the parent.

-"test alert|upalert|startupalert" client command added, which will immediately
 call an alert for testing purposes. Updated the docs for moncmd to reflect
 this command.


Changes between mon-0.38pre7 and mon-0.38.8
---------------------------------------------

-mon is now kept under CVS control (exclusively to maintain my own
 personal sanity). The Perl module is distributed as a separate file now,
 so that it can find its home in the CPAN module directory.

-Documented "traptimeout" and "trapduration", and cleaned up
 some docs in mon.1.

-Included upalerts and startupalerts in gen_scriptdir_hash()

-Lots of code cleanups in read_cf.

-alertafter now has two forms, one just like before, and
 one with a single integer argument which alerts after some number of
 consecutive failures.

-I should have done this long ago. %watch now looks like this:
	$watch{$group}->{$service}
 instead of
	$watch{$group}[$service]
 and $service is the text of the service, not an integer.

-Lots of code cleanups regarding global variables which are
 altered by read_cf.

-Fixed "list successes" and "list failures" command.

-Added "clear timers" command which clears the timers
 for things like alertafter and alertevery and such.

-netappfree.monitor has some MIB reading changes which fixes the
 core dumping problem.

-Added set_op_status.

-Removed some debug cruft from check_depend.

-Fix to $fhandles{"$group/$service"}.

-Updated "-h" output to be accurate.

-Test -f to see if an alert or monitor exists before trying to
 exec it.

-gilles reported a problem with the servertime output, which was fixed.

-"interval" initialization was supplying a default interval,
 which isn't cool because it didn't allow you to have a service w/o an
 interval for use as a trap sink. The new default is undef.

-I started work on muxpect, which is sort of a combination of the mux
 capabilities of fping and doing Expect-style chat sequences over TCP
 sockets. It is meant to replace those millions of TCP-based monitors
 in the mon.d directory with a less CPU-intensive version.

-Some alert decision code moved from proc_cleanup to do_alert where
 it belongs.

-Changed some trap code.


Changes between mon-0.38pre6 and mon-0.38pre7
---------------------------------------------

-Added "basedir=" and -b, and "cfbasedir=" and -B

-use usleep.

-Added startupalerts which are called upon startup.

-alerts called with env variable MON_ALERTTYPE

-logdir, added downtime logging via dtlogging/dtlogfile

-Periods can now be specified using a LABEL: tag (similar to
 labeling blocks and loops in Perl). This allows multiple periods with
 the same period value. This feature is useful because the "alertafter"
 and "alertevery" counters are kept on a per-period basis.

-Fixed process.monitor to use the new values for the process table
 in the UCD MIB.

-Fixed a problem with reload and path/file expansion.

-Alerts are now called with MON_RETVAL set to the exit value of the
 monitor.

-Added trap.alert. Not quite documented.

-Added version command to Mon::Client, thanks to nagel@intelenet.net.


Changes between mon-0.38pre5 and mon-0.38pre6
---------------------------------------------

-Some small adjustments to fping.monitor.

-SNMP trap reception is now part of the I/O loop.

-Began work on handle_snmp_trap, and got rid of SNMP-related
 junk in handle_trap.

-Fixed problem with whitespace and monitors ending in ";;" reported
 by llee@stevens-tech.edu.

-mon now has an officially assigned port number from the IANA. It is 2583,
 and the appropriate adjustments have been made to the clients.

-Fixed sock_write in server to handle EAGAIN condition when kernel socket
 buffers fill up.

-Added dialin.monitor which checks to see if dial-in modem lines are
 operational.  It requires the Perl Expect module. Documentation is in
 doc/README.monitors.

-Added an incomplete na_quota.monitor which is meant to monitor Network
 Appliance quota trees.


Changes between mon-0.38pre4 and mon-0.38pre5
---------------------------------------------

-Fixed bug #3, problem with %alias

-Fixed bug #4, problem with unpacking a socket which wasn't
 really a socket yet (out of order assignments)

-Renamed Client to Mon-0.01 to follow the Perl module naming
 convention better, and to make room for things like logging
 modules and such.

-Implemented more protocol commands to Mon::Client. Only 4 left...

-Adjusted nntp.monitor to allow for some protocol / implementation
 inconsistencies. The commands now strictly follow RFC977.

-Fixed problem with 0.38 protocol and Mon::Client.

-Added multiple authentication types, including getpwnam, shadow,
 and userfile. Read the man page for details.

-Added "version" client command to identify the protocol version.

-Added host && user authentication to traps. Configuration is done
 in auth.cf. No documentation yet.

-Added simple downtime logging, and documented it in mon.1.

-Tiny change to reboot.monitor.

-Added Mon::SNMP module to decode SNMP traps.

-Added pod to Mon::Client. I think it took as long to
 code it as it did to document it.


Changes between mon-0.38pre3 and mon-0.38pre4
---------------------------------------------

-Added fixes from Chris Adams <cadams@ro.com> that correct some $ALERTDIR
 and monitor argument problems.

-Fixes to monstatus from brian moore.

-Another fix to get the "exit=n" stuff working with alerts again, broken
 because of ALERTHASH code.

-Wrote "monshow" in the clients directory, which is a per-user configurable
 command-line client.

-Mon::Client perl module included to help simplify writing clients. It
 doesn't implement a number of commands yet. Look at the end of Client.pm
 to see which commands have been implemented and which have not been.

 "monshow" is in the clients directory, and it is an example of how to
 use the Mon::Client module.

 Mon::Client also needs POD documentation.


Changes between mon-0.38pre2 and mon-0.38pre3
---------------------------------------------

-Added "ack" client command, which will acknowledge a service failure and
 surppress all further alerts for that service while it continues to fail.
 See the moncmd man page for details. You can "ack" with a string of
 text.

-alertdir and scriptdir can now contain multiple colon-separated
 paths. This feature is useful for keeping site-specific monitors
 and alerts in their own directory which is separate from the monitors
 which are distributed with mon itself. Updated the docs for this.

 A hash is generated after each time the configuration is read
 which holds the location of where each monitor and alert script can
 be found. Errors are reported via syslog, so pay attention to them.

-Some "alias" code tweaks. Gilles, does it work??? If no, send
 the patch.

-Poked a little with the trap code. The trap format now contains
 a "spc" tag which specifies the specific type of trap, like maybe
 SNMPv1 or SNMPv2 or "mon 0.38". 

-An update to rpc.monitor to let it build under Solaris. It can now
 also check to see if an arbitrary RPC program number is registered.
 Documentation updates.


Changes between mon-0.38pre1 and mon-0.38pre2
---------------------------------------------

-Some fixed from brian moore to correct client hangups

-netappfree.monitor changes, including --list option to
 list the filesystems on the filers for help in building a config file.

-Trap handling changes, including packet format. More provisions
 for direct SNMP handling. I might add direct provisions for mon to take
 SNMP traps directly. UCD SNMP trap handling callback mechanism doesn't
 fit into mon very well.

-"list opstatus" output is now different

-Time::HiRes is now required. The trick is that handle_io() wants
 to spend $SLEEPINT handling I/O from clients. Some OSs allow select(2)
 to return the time remaining, which we want because if select returned
 in say, 0.2 seconds then we want to call select with a timeout of 0.8
 seconds so that we get the full second of waiting for I/O. Some OSs
 do *not* return the time remaining from a select call, and time(2)
 doesn't return sub-second resolution, so we need gettimeofday(2) to
 figure out how long select spent waiting. I guess the whole point here
 is to try to handle traps as soon as they come in.

-Fixed @last_failures discrepancy with traps.

-Added Gilles' alias record stuff to config file

-Included Jon Meek's up_rtt.monitor which checks the availability of
 hosts and logs some statistics, like min/mean/max round trip times.
 Requires Time::HiRes and Statistics::Descriptive.


Changes between mon-0.37l and mon-0.38
---------------------------------------

-Asynchronous trap handling. A remote agent may deliver a trap
 to trigger some action to be performed by a centralized mon
 server.

-Client I/O entirely re-written to support multiple simultaneous
 non-blocking clients.

-New client commands: test, set opstatus, list descriptions

-Descriptions are now allowed in service definitions

-Added Gilles' my-mon.cgi web interface.

-Added Jing Tan's dependency code

-When a service comes back up, it resets _first_failure
 so that alertevery does the right thing.

-When handling a "term" from the client, kill -15 children
 instead of -9.

-A fix from brian moore which corrected the client timeouts.

-Added "servertime" client command.

-Fixed moncmd to be more batch-friendly.

-Some security patches to mon.cgi from Roderick Schertler, including
 and changes to mon and the documentation for Debian compatability.

-Added "reload auth" command, which reloads the authentication table.

-Added per-service environment variable passing to monitor and alert scripts.

-Fixed '"no summary" with upalerts' problem reported by
 Eric Buda <eric@protoclown.nis.newscorp.com>. The output of successful
 monitors could be lost under certain circumstances.

-Fixed a small problem with upalerts reported by
 Josh Wilmes <josh@hitchhiker.org>. Upalerts would be triggered for
 everything the first time mon is started.

-process.monitor may optionally not load the MIBs upon startup.

-"-A" option would not make itself relative to the directory
 that mon was started from.

-netpage.alert not calls sendmail rather than "mail -s". Another fix
 from Josh Wilmes.

-A trivial tweak to nntp.monitor.

-Fixed problem with hostgroups named with periods reported by several
 people. This would cause a monitor process to not ever get cleaned up.

-Changed how load_auth handles errors

-fping.monitor adds a newline (right after removing it with tr :)

-changed the debug behavior to allow multiple debug levels


Changes between mon-0.37k and mon-0.37l
---------------------------------------
-Config parser change from Michael Griffith <grif@cadence.com> that
 complains when "alertafter" will never trigger an alert.

-Added "savestate" and "loadstate". Currently these only save
 and load the state of things disabled.

-The server now can authenticate clients using a simple
 configuration file which can restrict certain users to
 using only some (or all) commands. "moncmd" was updated
 to support this feature.

-Addition of "upalerts" which may be called when a service
 changes state from failure to success. "upalerts" can be
 controlled by the "upalertafter" parameter.

-"alertevery" now ignores detailed output when it decides
 whether or not to send an alert. Patch submitted by
 brian moore <bem@cmc.net>.

-"hostgroup and hyphen" patch. This simple patch will allow
 hyphens and periods in hostgroup tags.

-Multiline output fixes in smtp.monitor <roderick@argon.org>

-Now monitors are not called when no host arguments are supplied. This
 can be overridden with the per-service "allow_empty_group" option.

-A fix to ftp.monitor by Tiago Severina <ts@uevora.pt> which allows
 for multiple 220 lines in the greeting from the FTP server.

-Added snpp.alert, contributed by Mike Dorman <mdorman@debian.org>.
 This requires the SNPP Perl module.

-Added ldap.monitor, contributed by David Eckelkamp <davide@tradewave.com>.
 This requires the Net::LDAPapi module.

-Added dns.monitor, contributed by David Eckelkamp <davide@tradewave.com>.
 This requires the Net::DNS module.

-Monitor definitions can now include shell-like quoted words, as defined by
 the Text::ParseWords module (included with perl5). e.g.:
 	monitor something.monitor -f "this is an argument" -a arg

-"allow_empty_group" is a new per-service option. If set, monitors will
 still be run even if all hosts in the applicable hostgroup have been
 disabled. The default is that allow_empty_group is not set.

-Monitors are now forked with stdin connected to /dev/null.

-Added "stop" and "start" commands which let make the server cease from
 scheduling any monitors. While stopped, clients can still be handled. The
 server may be started[sic] in "stopped" mode with -S. There is now a
 "reset stopped", which is an atomic version of "reset" and "stop". This
 is useful if you want to re-disable things immediately after a reset,
 so there will be no race conditions after the reset and before you
 disable things.

 opstatus.cgi now also reports the state of the scheduler.

-Updated documentation for monitors, the main "mon" manual,
 and the "moncmd" manual.

-Fixed a few problems in handle_client that had to do with shutting
 the server down.


Changes between mon-0.37j and mon-0.37k
---------------------------------------
-ftp.monitor defaults to the SMTP port instead of FTP! Thanks to
 ryde@tripnet.se for pointing this out :)

-alanr@bell-labs.com added "-u" flag to http.monitor so that you
 can specify the URL to get.

-Added hpnp monitor, which uses SNMP to query your HP JetDirect
 boards in your printers, and warns you when things go awry.
 For example, if there is a paper jam, mon can send out email
 telling you exactly that, and it includes in the mail the
 current readout on the printer's LCD.

-Added netappfree.monitor, which uses SNMP to get the free space
 from Network Appliance filers. Uses a configuration file to
 set low-watermarks for each filer.

-Added process.monitor (thanks to Brian Moore), which 
 queries the UCD SNMP agents to determine if there are errors with
 particular processes on a machine. This is very useful for monitoring
 those processes which seem to die off on occasion :)


Changes between mon-0.37i and mon-0.37j
---------------------------------------
Tue Apr 14 19:22:13 PDT 1998

-Configuration parser now dies when a watch is "accidentally" re-defined.

-Added process throttle to prevent a number of forked processes
 to go beyond a given value. This is a paranoia "safety net" setting.


Changes between mon-0.37h and mon-0.37i
---------------------------------------
Sun Apr  5 13:59:07 PDT 1998

-Added "randstart" and "randskew" parameters that can help balance
 out the load from services which are sheduled at the same interval.

-Added "exit=range" argument to "alert", which allows triggering
 alerts based on the exit status of a monitor script.

-Added an IMAP monitor, and an SNMP "reboot" monitor

-Added http_t.monitor, which times HTTP transactions

-Merged in patches supplied by Roderick Schertler
    - Changes to mon:
        - Support a pid file.  This is necessary for the system's
          daemon control script (which stops and starts the daemon, plus
          tells it to reload its configuration) to work.
        - Treat SIGINT like SIGTERM (for interactive debugging).
        - Allow a `hostgroup' line in mon.cf which doesn't have any host
          names (useful for putting each host name on a line by itself).
        - Add `d' (meaning `days') to the list of suffixes accepted by
          the interval and alertevery keywords.
        - Squelch extra blank line output by alerthist and failurehist
          commands if there are no corresponding history entries.
        - Bug fix:  fork() returns undef, not -1, on error.
        - Set umask 022, no 0.
    - Changes to mon.cgi:
        - Set -T mode.
        - Allow all local info fields to be blank, and set them that way
          by default.
        - Use the same default mon host as the other interfaces.
        - Use $ENV{SCRIPT_NAME} as the default $url.
        - Don't hardcode the path to mon, assume it is in the path.
        - Vet the name passed to the `list group' command.  The old code
          would allow remote users to run arbitrary local commands.
    - Changes to opstatus.cgi:
        - Set -T mode.
        - Correct port, was 32768 should be 32777.
        - Add missing Content-Type to html_die().
    - In monstatus correct the my() line in populate_group(), and add
      missing $group initialization.
    - Tweak typesetting in the mon.1 and moncmd.1 man pages.


Changes between mon-0.37g and mon-0.37h
---------------------------------------
Mon Jan 19 07:22:14 PST 1998

-I didn't merge back in a change to fping.monitor which
 sorts the output of fping, this causing alerts to go off unnecessarily
 when fping would return hosts in a different order each time it is
 run. An alert is send once every "alertevery" interval, unless the
 output changes. This is where it messed things up.

-added GPL header to all source files.


Changes between mon-0.37f and mon-0.37g
----------------------------------------
Sat Jan 10 10:40:26 PST 1998

-Fixed memory leak, with the help of Martin Laubach and Ulrich Pfeifer.
 The Perl 4.004_04 IPC::Open2 routine has a leak in it.

-Now includes the SkyTel 2-way pager interface for mon! What a hack,
 but it works pretty well!

-Also includes Art Chan's interactive web interface. It has buttons
 and graphics and all that other stuff that everyone wants!

-Removed the Perl 5.003 Sys::Syslog patches. I don't want to encourage
 anyone to use an outdated version of Perl, especially since there have
 been plenty of bug fixes since then.

-Server now handles multiple commands per client connection, and opstatus.cgi
 has been changed to take advantage of this. It's much faster now.


Changes between mon-0.37e and mon-0.37f
----------------------------------------
Fri Oct  3 06:14:50 PDT 1997

-Fixed a small typo in "mon.d/freespace.monitor" that would correctly
 detect a failure condition for low disk space, but the text that it
 would report was incorrect.

-As per Sean Robinson's suggestions, renamed the syslog patches to
 Perl 5.004 to accurately reflect what versions of Perl they patch.

-In "mon.d/http.monitor", fixed problem with what matches as a valid
 HTTP response. "200 OK" is incorrect, because the text that follows
 the 200 is undefined in the specs.

