This file documents the major additions and syntax changes between releases.

...
	ENHANCEMENTS
	check_nt UPTIME accepts warning/critical thresholds (Ryan Kelly)
	check_disk_smb now allows spaces in share names (#990948, #1370031, Debian #601699)
	check_http now uses standard threshold functions (enables floating point and ranges)
	check_http now checks for and prints the certificate cn (hostname) in SSL certificate checks (Stéphane Urbanovski)
	check_http now supports an optional -S/--ssl value to choose the SSL protocol version (#3066166 - Jason Lunn)
	Add perfdata to check_ssh (#3244097 - Marco Beck)
	New option to check_smtp to ignore failures when sending QUIT (#3358348 - Duncan Ferguson)
	New check_by_ssh -F option which allows for specifying an alternative ssh_config(5) file (#2895334 - Sven Nierlein)
	check_sensors now detects faulty sensors unless --ignore-fault is specified (Jan Wagner)
	utils.sh now provides a check_range function (Alex Griffin)
	Updated Nagios::Plugin perl module

	FIXES
	Fix check_disk free space calculation if blocksizes differ within a disk group (Bekar - #2973603)
	check_disk_smb now handles NT_STATUS_ACCESS_DENIED properly (Debian #601696) 
	Make check_snmp work more like v1.4.14 with regard to using special values (Timeticks, STRING) as numeric thresholds
	Fix check_ldap overriding the port when --ssl was specified after -p
	Fix check_procs where regex input of '|' would get displayed in output - now replaced with ','
	Fix segfault in check_host when hostname returns multiple IP addresses (Sebastian Harl)
	Fix check_smtp and check_tcp where duplicate messages were displayed for certificate errors
	Disable RFC4507 support, to work around SSL negotiation issues with (at least) some Tomcat versions

1.4.15 27th July 2010
	ENHANCEMENTS
	New check_ntp_peer -m and -n options to check the number of usable time sources ("truechimers")
	New check_disk_smb -a option which allows for specifying the IP address of the remote server
	New check_radius -N option which allows for specifying the value of the NAS-IP-Address attribute
	New check_snmp --rate option to store differences between invocations. Saves state in PREFIX/var/{plugin}
	check_snmp -l label option now also changes the perfdata label. See WARNINGS
	check_snmp has an --invert-search option which reverses status of the string and regexp searches
	check_http now displays the missing search string and the URL in the output when failed (Duncan Ferguson - #2999924)
	Updated Nagios::Plugin perl module
	Updated gnulib to June 2010

	FIXES
	Fix check_ircd binding to wrong interface (#668778)
	Add proxy-authorization option to check_http (Marcel Kuiper - #1323230, Bryan Irvine - #2863925)
	check_icmp now increment the sequence counter in each packet
	Fix usage of repeated -o options in check_snmp
	Try to detect arguments passed via --with-ping[6]-command and set options accordingly (#2908236)
	Fix memory leak in check_http for large pages (Jimmy Bergman - #2957455)
	Fix compilation with GCC 2.96 (Konstantin Khomoutov - #2977105)
	Fix regression introduced in #1867716 where partially valid performance strings would not be printed anymore
	Fix regression in check_http ssl checks on some servers - make SNI an option
	Fix guest mode support in check_disk_smb
	Fix check_disk_smb and check_ircd failures when run via ePN
	check_ldap now allows for specifying an empty LDAP base
	Fix compilation error of pst3 in Solaris 8
	Fix check_radius returning OK on unexpected results (Craig Leres - #2911752)
	Fix translations when extra-opts aren't enabled (Jan Wagner - #2832884)
	Fix parsing of multi-line strings in check_snmp (broken in 1.4.14) and enhance output in such case (#2832451)
	Fix detection of pst3 64-bit compile flags with Sun CC
	Fix cmd_run overwriting the environment, which would break some commands that needed it
	Allow check_ifstatus to accept version=2c - used to only allow version=2 (Brian Landers)
	Fix examples in check_disk, where it implied was possible to suffix unit values to warn/crit parameters

	WARNINGS
	Updated developer documentation to say that performance labels should not have an equals sign or
	single quote in the label
	check_http 1.4.14 introduced SSL SNI support - you now have to enable it explicitly with "--sni"
	check_snmp -l label option is also used for the performance label. This could change history from previous uses

1.4.14 16th September 2009
	check_http has options to specify the HTTP method (#2155152)
	check_users thresholds were not working exactly as documented (>= rather than >)
	Updated tinderbox_build script to point to new tinderbox server
	check_ifoperstatus -n flag now works as expected (sf.net #1569488)
	check_ifoperstatus now supports ifType based lookup for ifIndex
	check_ups now sends a LOGOUT string (debian bug #387001)
	Extra-opts (C plugins) now allows both '#' and ';' for comments (like N::P)
	Extra-opts (C plugins) does not allow trailing comments anymore (like N::P)
	Fixed dependency issue on libtap when ./configure --enable-libtap used. Warning: will install libtap
	Fixed segfault in extra-opts under some circumstance when reading multiple sections
	Fix long options parsing in check_disk, check_dns, check_mrtg, check_mrtgtraf and check_tcp
	Add missing long options for check_nt (for use with extra-opts)
	check_icmp now reports min and max round trip time perfdata (Steve Rader)
	Fixed check_http bug where additional headers with redirection caused a segfault (Dieter Van de Walle - 2089159)
	check_disk: make autofs mount paths specified with -p before we determine the mount list (Erik Welch)
	Fixed buffer overflow in check_ntp/check_ntp_peer (#1999319, Ubuntu #291265)
	Re-bundled libtap as a built-in library (--enable-libtap): detects system library as pre-1.4.13 and does not install the built-in library anymore
	Fixed check_mrtg returning UNKNOWN instead of OK (bug #2378068)
	Fixed check_http behaviour: all check are now performed as long as a valid response is returned (sf.net #1460312)
	check_http --onredirect=sticky follows using the same IP address (sf.net #2550208)
	check_http --onredirect=stickyport also follows the same port
	Fixed coredump from check_nt when invalid drive is specified (#2179754 - Olli Hauer)
	Fixed crash from check_nt when -H unspecified or given multiple times (sf.net #2731755, debian #521097)
	Fixed passing of quotes in OID for check_snmp (#1985230 - Jan Wagner, patch by John Barbuto)
	Fixed check_http sending HTTP/1.0 with v1.1 headers (#2638765)
	Fixed check_http not timing-out on redirects
	Fixed negate not printing the real timeout in ALRM handler when left to default
	negate timeout result is now configurable
	Fixed segfault in check_mysql with old slaves (#2696823 - Oskar Ahner)
	check_nt can return UNKNOWN on timeouts (-u)
	Fixed typos for check_disk (Chris Pepper)
	Fixed check_mysql* not using password set in my.cnf (#2531905 - Ben Timby) - Specify an empty password explicitly if you need to override it.
	Fixed awk subst.in/subst script path error (#2722832 - Martin Foster)
	check_http: Add SSL/TLS hostname extension support (SNI) - (#1939022 - Joe Presbrey)
	Fixed wrong perfdata label for output traffic in check_mrtgtraf (#2654308 - Gavin Williams)
	Fixed check_by_ssh interpretation of quotes in -C parameter (#1985246, #2268675)
	check_snmp now supports standard threshold ranges and doubles (floating numbers) in thresholds
	check_fping now supports passing target timeout and interval to fping (#2347686 - Martin Foster)
	Fixed SNMPv3 behaviour of check_ifoperstatus and check_ifstatus. Added -P to define privprotocol (#2343438 - Robin Schroeder)
	check_ifoperstatus and check_ifstatus are now more user-friendly in case of missing arguments
	pst3 compile fix for Sun Studio Compiler (Grant Byers)

1.4.13 25th Sept 2008
	Fix Debian bug #460097: check_http --max-age broken (Hilko Bengen)
	Optimised pst3 for systems with large number of processes (Duncan Ferguson)
	Updated Nagios::Plugin to 0.27
	Fix Debian bug #479013: check_dig's -l is mandatory now (sf.net #1986306)
	check_dig now returns CRITICAL instead of WARNING when no answer section is found
	check_procs now captures stderr in external command and adds to plugin output
	check_snmp now only prints perfdata for non numeric values (#1867716)
	check_icmp now supports packet size modification
	check_http -e now accepts a comma-delimited list of expected status codes (Sven Nierlein)
	libtap now included with this distribution for easier testing. Run ./configure with --enable-libtap
	check_ntp_peer/check_ntp_time used to show port in --help but ignored the argument - now implemented
	Fix possible segfault in check_ntp_peer with deliberately invalid packets

1.4.12 27th May 2008
	Added ./check_nt -v INSTANCES to count number of instances (Alessandro Ren)
	New check_icmp -s option to specify the source IP address
	check_dns now sorts addresses for testing results for more than one returned IP (Matthias Urlichs)
	Fix segfault in check_ntp_time and (deprecated) check_ntp (Bug #1862300)
	check_disk should now work with large file systems (2TB+) on all archs that supports it
	Fixed check_disk disk usage calculation when using --group=NAME (related to bug #1348746)
	Fix help text of check_ntp* (Bug #1880095)
	Fix bugs and flaws in best offset server selection of check_ntp_time and (deprecated) check_ntp
	check_ntp_peer now checks for the LI_ALARM flag
	Sync to latest Gnulib (includes new floorf function)
	check_pgsql now successfully builds with postgres lib v8.3 (Bug #1878972)  
	check_procs now accepts --ereg-argument-array for a regular expression match to the argument array
	Reverted back to using pst3 for Solaris systems. Fixed issues re: -m64 needed to compile on 64bit systems
	If applicable, Gettext linked dynamically instead of statically
	check_dig can now pass arguments to dig by using -A/--dig-arguments (#1874041/#1889453)
	check_ntp and check_ntp_peer now show proper jitter/stratum thresholds longopts in --help
	check_dns now allow to repeat -a to match multiple possibly returned address (common with load balancers)
	check_mysql and check_radius now try clearing password in processlist just like check_mysql_query
	check_mysql and check_mysql_query now support sockets explicitely (-s, --socket)
	negate now has the ability to replace the status text as well (-s, --substitute)
	Added performance data to check_ping (Christian Schneemann)
	Added support for --extra-opts in all C plugins (disabled by default, see configure --help)
	Fixed passive option in check_by_ssh
	On non-skipped stderr, check_by_ssh now returns UNKNOWN or worse (result from command) instead of always UNKNOWN.
	Fix linking against OpenSSL where libdl is required

1.4.11 13th December 2007
	Fixed check_http regression in 1.4.10 where following redirects to
	  relative URLs on virtual hosts failed if both "-H" and "-I" were used
	Merged two new checks that deprecates check_ntp: check_ntp_peer and check_ntp_time.
	  You should read the --help output so see which one is suitable for you. check_ntp_peer
	  implement stratum thresholds support (feature request #1703823).
	check_ntp now returns UNKNOWN instead of WARNING if jitter is unavailable (jitter=-1.000000)
	  as long as the thresholds range include -1. If no offset threshold is specified
	  and the offset is unavailable, will return UNKNOWN as well.
	  NOTE: If jitter thresholds are specified as integers it will return CRITICAL if jitter
	  is "-1" as the default range starts at 0. See Examples in --help output.
	Fixed broken usage2 in check_snmp and check_cluster
	check_cluster now accepts all valid characters in its thresholds ("-", "@", "~")
	Fixed check_disk reporting OK if disk usage grows over 100% (bug #1348746).
	  The problem happens to be in Gnulib but a workaround have been implemented in check_disk.c
	Fixed check_load argument handling when not passing triplets (bug #1831890)
	Fixed buffer overflow in check_snmp (CVE-2007-5623)
	Tinderbox builds now runs tests in a verbose mode
	Updated Nagios::Plugin to 0.22
	VPATH problem fixed for compiling plugins-root

1.4.10 28th September 2007
	Fix check_http buffer overflow vulnerability when following HTTP redirects (CVE-2007-5198)
	check_http now explicitly asks HTTP/1.1 servers to close the connection
	  after completion of the response
	Check_ldaps' guessing which secure method to use (starttls vs. ssl on connect)
	  is now deprecated. See --help for further information.
	Check_disk now calls stat() on all filesystems to check. (Old: only the ones selected using -p)
	  A meaningful error message (eg "Stale NFS Handle") is printed if stat fails.
	New check_disk option -L: Only check local filesystems, but call stat() on remote ones, too.
	  Thus accessibility of remote filesystems can be checked without any threshold comparison.
	Check_disk's --help now prints some examples for the new features introduced in 1.4.8
	New check_disk -i/-I option to ignore pathes/partitions based on regular expressions
	New check_disk -A option to select all filesystems explicitly
	WARNING: check_disk's -E option must now be passed before -p or -r/-R arguments
	  Passing -E after -p or -r results in UNKNOWN state, now
	  This is needed due to the new ignore feature
	Fix check_disk bug when mixing case sensitive and case insensitive regex arguments
	New check_dhcp -u/--unicast option for emulating a DHCP relay in order
	  to check DHCP servers on remote networks
	New check_dhcp -m/--mac option which allows for specifying the MAC
	  address to use in the DHCP request
	The check_dhcp -r and -s options now accept host names, too
	Fix possible check_icmp bus errors on some (non-x86/AMD64) platforms
	Fix check_smtp's handling of multiple-packet server responses
	WARNING: Fix for negate which may break existing commands:
	  - stop evaluating command line options through shell twice
	  - enforce a full path for the command to run
	The "negate" utility can now remap custom states
	Check_radius now supports radiusclient-ng
	The (undocumented) positional parameter parsing which check_radius used
	  instead of getopt(3) if 8 arguments were given is no longer available
	Check_by_ssh now supports multiline output
	IPv6 support can now be disabled using ./configure --without-ipv6
	Fix check_ntp now honor ntp flags

1.4.9 4th June 2007
	Inclusion of contrib/check_cluster2 as check_cluster with some improvements
	New/improved -E/--skip-stderr and -S/--skip-stdout options for check_by_ssh
	check_snmp now supports Counter64
	Fix compilation of check_ldap, check_radius and check_pgsql
	check_load can optionally divide by number of cpus
	Fix check_time returning wrong OK when time is before the epoch on some arch
	Make check_http output more consistent
	Fix possible check_http segfaults when following HTTP redirects
	check_snmp don't warn anymore if something is printed on stderr
	Fix check_tcp segfault when multiple expect strings are given
	New option for check_tcp: -A/--all to test if all given expect strings match

1.4.8 11th April 2007
	Respects --without-world-permissions for setuid plugins
	check_disk extra options for regex matching of filesystems and grouping of filesystems
	for collective thresholds
	Better configure test for mysqlclient availability
	Various check_ntp fixes

1.4.7 29th March 2007
	check_procs uses /usr/ucb/ps if available - fixes pst3 problems on Solaris
	Fixed MKINSTALLDIRS problem in po/
	./configure now detects if possible to compile check_mysql
	Fixed broken HELO in check_smtp
	check_icmp now allows to set a minimum number of hosts required for successs (-m)
	check_icmp fix for *BSD when running for long time
	check_ping times out 1 second quicker if host is unreachable
	Root plugins installed with world executable
	check_sybase from contrib now maintained in NagiosExchange
	--with-nagios-user/group reinstated ./configure option
	New --without-world-permissions ./configure option

1.4.6 5th February 2007
	Reduced number of DNS lookups in check_ping and netutils.c for IPv6 configurations
	Fixed compile problems with *BSD re: alloca.h
	Fixed Solaris problems with check_swap (tested on Solaris 9)
	Fixed check_swap for HP/UX where swapinfo command was incorrect
	Fixed check_disk inode threshold checks, regressed at r1.4.4.
	Fixed crit/warn for check_disk perf data
	Fixed buffer overflow in check_procs
	Fixed error handling for UNIX sockets in netutils.c
	New -q and -o options for check_by_ssh which are handed over to ssh(1) as is
	Synced with latest GNUlib
	Fixed check_jabber always returns warning

1.4.5
	Fixed bug in perl's is_hostname routine

1.4.4
	New C based check_ntp. The perl version is now deprecated.
	New check_apt plugin
	Notice: plugins in contrib/ will start to be removed from this distribution.
	  Please check at http://www.nagiosexchange.org for contributed plugins
	Major bug fixes to check_disk where values were incorrectly calculated and alerted on.
	check_udp2 removed. check_udp is now linked to check_tcp.c
	check_mailq now errors if the sub-program run returns non-zero return code. This would appear
	  as if mailqs were okay when the nagios user could not query the mail-queues
	Compile problems with check_snmp fixed

1.4.3
	Setuid plugins (check_dhcp, check_icmp) separated into plugins-root/. Run make install as root to install
	SSL plugins work with gnutls as well as OpenSSL
	check_mysql_query added to run arbitrary SQL commands, with threshold checking
	libtool now required for development systems
	Notice: check_udp (compiled from check_udp.c) will be deprecated in the next release.
	  check_udp2 should be used instead and will be renamed to check_udp

1.4.2
	Fix for Redhat ES4 for check_dns and check_dig

1.4
	IPv6 support in check_ping, check_by_ssh, check_http, check_ldap, check_smtp, check_tcp
	Internationalisation support
	Performance data added to most plugins
	check_disk now using GNU coreutils code
	New plugins - check_dhcp, check_icmp
	contrib/check_citrix has been replaced by contrib/check_ica* (requires packet_utils.pm in libexec)
	check_http --min changed to --pagesize, added max so min:max in check
	check_vsz and check_rss deprecated - functionality moved into check_procs
	check_swap % thresholds changed to measure amount free, instead of amount used
	check_disk syntax changes for -p, -m/-M, defaults to MB instead of kB
	check_procs -C expects no path for the command name