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1 This file documents the major additions and syntax changes between releases.
3 2.1 15th October 2014
4 ENHANCEMENTS
5 New check_hpjd -p option for port specification (abrist)
6 New ./configure --with-qmail-qstat-command option to specify the path to
7 qmail-qstat(8)
8 New check_ifstatus -n option to ignore interfaces by name
9 check_ntp_peer has now specific state output for each metric
10 New check_mysql -n option to ignore authentication failures
11 Added IP and port or socket name to error messages
12 New check_ntp_time -o option to add expected offset
13 check_disk shows now troubled partions in verbose mode
14 check_dig has now support for drill and dig
15 check_dig has now support for -6 option
16 Add performance data to check_file_age
18 FIXES
19 Fix check_jabber to work with Openfire servers
20 Fix check_oracle bad string matching when testing TNS server
21 Fixed check_ifstatus performance data output
22 Fixed expire time output for sslutils
23 check_dns now verifies if the answer is returning from the queried
24 server
25 Fix check_by_ssh to accept --hostname as argument
27 WARNINGS
28 This release doesn't ship with an RPM spec file, please contribute to
29 PR #1283 if you are interested in it
31 2.0 11th July 2014
32 ENHANCEMENTS
33 check_mailq now supports auto detection of qmail, postfix, exim and nullmailer with
34 fallback to sendmail
35 check_ide_smart now defaults to plugin output, original output appended with -v
36 Extra-Opts are now enabled by default, see:
37 https://www.monitoring-plugins.org/doc/extra-opts.html
38 check_swap now supports a configurable state when there is no swap
39 check_radius now supports the FreeRADIUS Client library
40 New check_mysql_query -f option to specify a client options file
41 New check_mysql_query -g option to specify a client options group
42 Add performance data to check_mysql_query
43 New check_file_age -i/--ignore-missing option to return OK on nonexistent files
44 Make check_ping, check_users, and check_disk work on Windows
45 New check_ssh -P option to specify the expected SSH protocol version
46 check_dns now emits the warning and critical thresholds with the performance data
48 FIXES
49 Don't let e.g. check_http's -C option reset SSL version if e.g. -S 1 -C 5 is specified
50 Don't have check_http's -N option expect an argument
51 check_ide_smart could disable offline auto tests but could not re-enable them.
52 For this reason all SMART command modes have been disabled.
53 check_dig: fix wrong IPv6 arguments order (Stéphane Bortzmeyer)
54 check_dig: make sure not to give up too early when a timeout is specified with -t
55 check_log: don't stumble over log lines that include a "%" character
56 check_nt: add UPTIME to perfdata
57 Handle SNMPv3 noAuthNoPriv properly with check_snmp
58 Fix compilation with GnuTLS
60 WARNINGS
61 New default installation prefix: /usr/local instead of /usr/local/nagios
62 check_snmp now evaluates negative values properly, which means it might return CRITICAL
63 in cases where it used to return OK. If this is undesired, the warning/critical
64 threshold(s) must be fixed by specifying e.g. ~:100 instead of 100
65 check_procs now ignores its parent process to avoid unexpected results when invoked via
66 certain shells
67 utils.sh no longer defines ECH
68 check_ide_smart -q/--quiet and -n/--nagios (Nagios-compatible output) are now deprecated
69 but accepted for backward-compatibility
70 check_ide_smart -0/--auto-off, -1/--auto-on and -i/--immediate: options have
71 been disabled because they were broken
72 State retention: the NAGIOS_PLUGIN_STATE_DIRECTORY environment variable has been
73 renamed MP_STATE_PATH. The old variable will continue to work in v2.0.x
74 Add the UID of the invoking user to the state retention file path. This helps solving
75 permission issues when different users run the same plugin
76 check_swap used to allow returning OK on a system without swap when only percent thresholds
77 were used. This is no longer the case and one must now use -n/--no-swap=<state>
78 The Perl and Shell plugins now use the PATH specified via ./configure's --trusted-path
79 option, or "/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin" by default
81 1.5 2nd October 2013
82 ENHANCEMENTS
83 New check_dbi plugin for checking an (SQL) database using DBI
84 Let OpenSSL load its configuration file (see the OPENSSL_config(3) man page)
85 Add performance data to check_apt
86 Add performance data to check_procs
87 Added -4/-6 options to check_dig (Ville Mattila)
88 New check_oracle --connect option to perform real login
89 New check_nagios -t option to override the default timeout
90 New check_disk -f/--freespace-ignore-reserved option to ignore space reserved for root
91 New check_disk -N/--include-type option to limit the filesystem types to check
92 Allow for building the plugins in parallel
93 Add --without-{dbi,ldap,radius} options to ./configure
94 Made Verbose output of check_sensors compliant (Gabriele Tozzi)
95 New switch -E/--extended-perfdata for check_http to print additional performance data (Sebastian Nohn)
96 New check_http -d option to specify a string to expect within the response headers
97 New check_http -J/-K options for client certificate authentication support
98 Add support for executing queries to check_pgsql
99 Let check_pgsql accept a UNIX socket directory as hostname
100 New check_pgsql -o option to specify additional connection parameters
101 New check_fping -S option to specify the source IP address
102 New check_fping -I option to specify the interface to bind to
103 Let check_fping support IPv6
104 New check_procs -k option to ignore kernel threads (on Linux)
105 Let check_procs use /proc/<PID>/exe (if available) instead of getpid(2), unless -T is specified
106 Let check_mysql support SSL
107 Let check_mysql add perfromance metrics for all checks
108 New check_mysql -f option to specify a client options file
109 New check_mysql -g option to specify a client options group
110 New check_snmp --offset option to allow for adding/substracting an offset value to sensor data
111 Let check_snmp support an arbitrary number of OIDs
112 Let check_ide_smart support NetBSD
114 FIXES
115 Change the MAIL FROM command generated by check_smtp to be RFC compliant
116 Fix compilation of check_http without SSL support
117 Fix check_snmp reversed threshold ranges (backward-compatibility)
118 Fix check_snmp memory violation when using more than 8 oids (Robin Sonefors)
119 Fix check_apt security regular expression (Alex Bradley)
120 Fix check_http handling extra header (-k) containing semicolons (Richard Leitner)
121 Fix check_apt handling unknown exit codes from apt-get (Richard Leitner)
122 Fix deprecated imports of check_nmap.py (Fabio Rueda)
124 WARNINGS
125 check_http behaviour of -k/--header changed since it does not seperate multiple headers by semicolons anymore. Use multiple -k switches instead.
126 check_http's --proxy_authorization option is now called --proxy-authorization (it was always documented this way)
127 The contrib directory has been removed from this distribution
129 1.4.16 27th June 2012
130 ENHANCEMENTS
131 check_nt UPTIME accepts warning/critical thresholds (Ryan Kelly)
132 check_disk_smb now allows spaces in share names (#990948, #1370031, Debian #601699)
133 check_http now uses standard threshold functions (enables floating point and ranges)
134 check_http now checks for and prints the certificate cn (hostname) in SSL certificate checks (Stéphane Urbanovski)
135 check_http now supports an optional -S/--ssl value to choose the SSL protocol version (#3066166 - Jason Lunn)
136 Add perfdata to check_ssh (#3244097 - Marco Beck)
137 New option to check_smtp to ignore failures when sending QUIT (#3358348 - Duncan Ferguson)
138 New check_by_ssh -F option which allows for specifying an alternative ssh_config(5) file (#2895334 - Sven Nierlein)
139 check_sensors now detects faulty sensors unless --ignore-fault is specified (Jan Wagner)
140 utils.sh now provides a check_range function (Alex Griffin)
141 Improved the performance of check_users (Marc Remy)
142 Add perfdata to check_disk_smb (Debian #654259 - Charles-Henri Larose)
143 Updated Nagios::Plugin perl module
144 Add warning threshold to certificate expiration checks of check_tcp/http/smtp (William Leibzon)
145 Add --perf-oids option for check_snmp (Jochen Bern)
147 FIXES
148 Fix check_disk free space calculation if blocksizes differ within a disk group (Bekar - #2973603)
149 check_disk_smb now handles NT_STATUS_ACCESS_DENIED properly (Debian #601696)
150 Make check_snmp work more like v1.4.14 with regard to using special values (Timeticks, STRING) as numeric thresholds
151 Fix check_ldap overriding the port when --ssl was specified after -p
152 Fix check_procs where regex input of '|' would get displayed in output - now replaced with ','
153 Fix segfault in check_host when hostname returns multiple IP addresses (Sebastian Harl)
154 Fix check_smtp and check_tcp where duplicate messages were displayed for certificate errors
155 Fix check_ping's parsing of ping6(1) output (#1894850, Debian #514588, Debian #662638 - Matej Vela)
156 Fix a check_dhcp bug which was triggered by checking Windows 2003 DHCP servers (#3503921)
157 Disable RFC4507 support, to work around SSL negotiation issues with (at least) some Tomcat versions
158 Fix performance data label containing spaces in check_snmp (Jochen Bern)
160 1.4.15 27th July 2010
161 ENHANCEMENTS
162 New check_ntp_peer -m and -n options to check the number of usable time sources ("truechimers")
163 New check_disk_smb -a option which allows for specifying the IP address of the remote server
164 New check_radius -N option which allows for specifying the value of the NAS-IP-Address attribute
165 New check_snmp --rate option to store differences between invocations. Saves state in PREFIX/var/{plugin}
166 check_snmp -l label option now also changes the perfdata label. See WARNINGS
167 check_snmp has an --invert-search option which reverses status of the string and regexp searches
168 check_http now displays the missing search string and the URL in the output when failed (Duncan Ferguson - #2999924)
169 Updated Nagios::Plugin perl module
170 Updated gnulib to June 2010
172 FIXES
173 Fix check_ircd binding to wrong interface (#668778)
174 Add proxy-authorization option to check_http (Marcel Kuiper - #1323230, Bryan Irvine - #2863925)
175 check_icmp now increment the sequence counter in each packet
176 Fix usage of repeated -o options in check_snmp
177 Try to detect arguments passed via --with-ping[6]-command and set options accordingly (#2908236)
178 Fix memory leak in check_http for large pages (Jimmy Bergman - #2957455)
179 Fix compilation with GCC 2.96 (Konstantin Khomoutov - #2977105)
180 Fix regression introduced in #1867716 where partially valid performance strings would not be printed anymore
181 Fix regression in check_http ssl checks on some servers - make SNI an option
182 Fix guest mode support in check_disk_smb
183 Fix check_disk_smb and check_ircd failures when run via ePN
184 check_ldap now allows for specifying an empty LDAP base
185 Fix compilation error of pst3 in Solaris 8
186 Fix check_radius returning OK on unexpected results (Craig Leres - #2911752)
187 Fix translations when extra-opts aren't enabled (Jan Wagner - #2832884)
188 Fix parsing of multi-line strings in check_snmp (broken in 1.4.14) and enhance output in such case (#2832451)
189 Fix detection of pst3 64-bit compile flags with Sun CC
190 Fix cmd_run overwriting the environment, which would break some commands that needed it
191 Allow check_ifstatus to accept version=2c - used to only allow version=2 (Brian Landers)
192 Fix examples in check_disk, where it implied was possible to suffix unit values to warn/crit parameters
194 WARNINGS
195 Updated developer documentation to say that performance labels should not have an equals sign or
196 single quote in the label
197 check_http 1.4.14 introduced SSL SNI support - you now have to enable it explicitly with "--sni"
198 check_snmp -l label option is also used for the performance label. This could change history from previous uses
200 1.4.14 16th September 2009
201 check_http has options to specify the HTTP method (#2155152)
202 check_users thresholds were not working exactly as documented (>= rather than >)
203 Updated tinderbox_build script to point to new tinderbox server
204 check_ifoperstatus -n flag now works as expected (sf.net #1569488)
205 check_ifoperstatus now supports ifType based lookup for ifIndex
206 check_ups now sends a LOGOUT string (debian bug #387001)
207 Extra-opts (C plugins) now allows both '#' and ';' for comments (like N::P)
208 Extra-opts (C plugins) does not allow trailing comments anymore (like N::P)
209 Fixed dependency issue on libtap when ./configure --enable-libtap used. Warning: will install libtap
210 Fixed segfault in extra-opts under some circumstance when reading multiple sections
211 Fix long options parsing in check_disk, check_dns, check_mrtg, check_mrtgtraf and check_tcp
212 Add missing long options for check_nt (for use with extra-opts)
213 check_icmp now reports min and max round trip time perfdata (Steve Rader)
214 Fixed check_http bug where additional headers with redirection caused a segfault (Dieter Van de Walle - 2089159)
215 check_disk: make autofs mount paths specified with -p before we determine the mount list (Erik Welch)
216 Fixed buffer overflow in check_ntp/check_ntp_peer (#1999319, Ubuntu #291265)
217 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
218 Fixed check_mrtg returning UNKNOWN instead of OK (bug #2378068)
219 Fixed check_http behaviour: all check are now performed as long as a valid response is returned (sf.net #1460312)
220 check_http --onredirect=sticky follows using the same IP address (sf.net #2550208)
221 check_http --onredirect=stickyport also follows the same port
222 Fixed coredump from check_nt when invalid drive is specified (#2179754 - Olli Hauer)
223 Fixed crash from check_nt when -H unspecified or given multiple times (sf.net #2731755, debian #521097)
224 Fixed passing of quotes in OID for check_snmp (#1985230 - Jan Wagner, patch by John Barbuto)
225 Fixed check_http sending HTTP/1.0 with v1.1 headers (#2638765)
226 Fixed check_http not timing-out on redirects
227 Fixed negate not printing the real timeout in ALRM handler when left to default
228 negate timeout result is now configurable
229 Fixed segfault in check_mysql with old slaves (#2696823 - Oskar Ahner)
230 check_nt can return UNKNOWN on timeouts (-u)
231 Fixed typos for check_disk (Chris Pepper)
232 Fixed check_mysql* not using password set in my.cnf (#2531905 - Ben Timby) - Specify an empty password explicitly if you need to override it.
233 Fixed awk subst.in/subst script path error (#2722832 - Martin Foster)
234 check_http: Add SSL/TLS hostname extension support (SNI) - (#1939022 - Joe Presbrey)
235 Fixed wrong perfdata label for output traffic in check_mrtgtraf (#2654308 - Gavin Williams)
236 Fixed check_by_ssh interpretation of quotes in -C parameter (#1985246, #2268675)
237 check_snmp now supports standard threshold ranges and doubles (floating numbers) in thresholds
238 check_fping now supports passing target timeout and interval to fping (#2347686 - Martin Foster)
239 Fixed SNMPv3 behaviour of check_ifoperstatus and check_ifstatus. Added -P to define privprotocol (#2343438 - Robin Schroeder)
240 check_ifoperstatus and check_ifstatus are now more user-friendly in case of missing arguments
241 pst3 compile fix for Sun Studio Compiler (Grant Byers)
243 1.4.13 25th Sept 2008
244 Fix Debian bug #460097: check_http --max-age broken (Hilko Bengen)
245 Optimised pst3 for systems with large number of processes (Duncan Ferguson)
246 Updated Nagios::Plugin to 0.27
247 Fix Debian bug #479013: check_dig's -l is mandatory now (sf.net #1986306)
248 check_dig now returns CRITICAL instead of WARNING when no answer section is found
249 check_procs now captures stderr in external command and adds to plugin output
250 check_snmp now only prints perfdata for non numeric values (#1867716)
251 check_icmp now supports packet size modification
252 check_http -e now accepts a comma-delimited list of expected status codes (Sven Nierlein)
253 libtap now included with this distribution for easier testing. Run ./configure with --enable-libtap
254 check_ntp_peer/check_ntp_time used to show port in --help but ignored the argument - now implemented
255 Fix possible segfault in check_ntp_peer with deliberately invalid packets
257 1.4.12 27th May 2008
258 Added ./check_nt -v INSTANCES to count number of instances (Alessandro Ren)
259 New check_icmp -s option to specify the source IP address
260 check_dns now sorts addresses for testing results for more than one returned IP (Matthias Urlichs)
261 Fix segfault in check_ntp_time and (deprecated) check_ntp (Bug #1862300)
262 check_disk should now work with large file systems (2TB+) on all archs that supports it
263 Fixed check_disk disk usage calculation when using --group=NAME (related to bug #1348746)
264 Fix help text of check_ntp* (Bug #1880095)
265 Fix bugs and flaws in best offset server selection of check_ntp_time and (deprecated) check_ntp
266 check_ntp_peer now checks for the LI_ALARM flag
267 Sync to latest Gnulib (includes new floorf function)
268 check_pgsql now successfully builds with postgres lib v8.3 (Bug #1878972)
269 check_procs now accepts --ereg-argument-array for a regular expression match to the argument array
270 Reverted back to using pst3 for Solaris systems. Fixed issues re: -m64 needed to compile on 64bit systems
271 If applicable, Gettext linked dynamically instead of statically
272 check_dig can now pass arguments to dig by using -A/--dig-arguments (#1874041/#1889453)
273 check_ntp and check_ntp_peer now show proper jitter/stratum thresholds longopts in --help
274 check_dns now allow to repeat -a to match multiple possibly returned address (common with load balancers)
275 check_mysql and check_radius now try clearing password in processlist just like check_mysql_query
276 check_mysql and check_mysql_query now support sockets explicitely (-s, --socket)
277 negate now has the ability to replace the status text as well (-s, --substitute)
278 Added performance data to check_ping (Christian Schneemann)
279 Added support for --extra-opts in all C plugins (disabled by default, see configure --help)
280 Fixed passive option in check_by_ssh
281 On non-skipped stderr, check_by_ssh now returns UNKNOWN or worse (result from command) instead of always UNKNOWN.
282 Fix linking against OpenSSL where libdl is required
284 1.4.11 13th December 2007
285 Fixed check_http regression in 1.4.10 where following redirects to
286 relative URLs on virtual hosts failed if both "-H" and "-I" were used
287 Merged two new checks that deprecates check_ntp: check_ntp_peer and check_ntp_time.
288 You should read the --help output so see which one is suitable for you. check_ntp_peer
289 implement stratum thresholds support (feature request #1703823).
290 check_ntp now returns UNKNOWN instead of WARNING if jitter is unavailable (jitter=-1.000000)
291 as long as the thresholds range include -1. If no offset threshold is specified
292 and the offset is unavailable, will return UNKNOWN as well.
293 NOTE: If jitter thresholds are specified as integers it will return CRITICAL if jitter
294 is "-1" as the default range starts at 0. See Examples in --help output.
295 Fixed broken usage2 in check_snmp and check_cluster
296 check_cluster now accepts all valid characters in its thresholds ("-", "@", "~")
297 Fixed check_disk reporting OK if disk usage grows over 100% (bug #1348746).
298 The problem happens to be in Gnulib but a workaround have been implemented in check_disk.c
299 Fixed check_load argument handling when not passing triplets (bug #1831890)
300 Fixed buffer overflow in check_snmp (CVE-2007-5623)
301 Tinderbox builds now runs tests in a verbose mode
302 Updated Nagios::Plugin to 0.22
303 VPATH problem fixed for compiling plugins-root
305 1.4.10 28th September 2007
306 Fix check_http buffer overflow vulnerability when following HTTP redirects (CVE-2007-5198)
307 check_http now explicitly asks HTTP/1.1 servers to close the connection
308 after completion of the response
309 Check_ldaps' guessing which secure method to use (starttls vs. ssl on connect)
310 is now deprecated. See --help for further information.
311 Check_disk now calls stat() on all filesystems to check. (Old: only the ones selected using -p)
312 A meaningful error message (eg "Stale NFS Handle") is printed if stat fails.
313 New check_disk option -L: Only check local filesystems, but call stat() on remote ones, too.
314 Thus accessibility of remote filesystems can be checked without any threshold comparison.
315 Check_disk's --help now prints some examples for the new features introduced in 1.4.8
316 New check_disk -i/-I option to ignore pathes/partitions based on regular expressions
317 New check_disk -A option to select all filesystems explicitly
318 WARNING: check_disk's -E option must now be passed before -p or -r/-R arguments
319 Passing -E after -p or -r results in UNKNOWN state, now
320 This is needed due to the new ignore feature
321 Fix check_disk bug when mixing case sensitive and case insensitive regex arguments
322 New check_dhcp -u/--unicast option for emulating a DHCP relay in order
323 to check DHCP servers on remote networks
324 New check_dhcp -m/--mac option which allows for specifying the MAC
325 address to use in the DHCP request
326 The check_dhcp -r and -s options now accept host names, too
327 Fix possible check_icmp bus errors on some (non-x86/AMD64) platforms
328 Fix check_smtp's handling of multiple-packet server responses
329 WARNING: Fix for negate which may break existing commands:
330 - stop evaluating command line options through shell twice
331 - enforce a full path for the command to run
332 The "negate" utility can now remap custom states
333 Check_radius now supports radiusclient-ng
334 The (undocumented) positional parameter parsing which check_radius used
335 instead of getopt(3) if 8 arguments were given is no longer available
336 Check_by_ssh now supports multiline output
337 IPv6 support can now be disabled using ./configure --without-ipv6
338 Fix check_ntp now honor ntp flags
340 1.4.9 4th June 2007
341 Inclusion of contrib/check_cluster2 as check_cluster with some improvements
342 New/improved -E/--skip-stderr and -S/--skip-stdout options for check_by_ssh
343 check_snmp now supports Counter64
344 Fix compilation of check_ldap, check_radius and check_pgsql
345 check_load can optionally divide by number of cpus
346 Fix check_time returning wrong OK when time is before the epoch on some arch
347 Make check_http output more consistent
348 Fix possible check_http segfaults when following HTTP redirects
349 check_snmp don't warn anymore if something is printed on stderr
350 Fix check_tcp segfault when multiple expect strings are given
351 New option for check_tcp: -A/--all to test if all given expect strings match
353 1.4.8 11th April 2007
354 Respects --without-world-permissions for setuid plugins
355 check_disk extra options for regex matching of filesystems and grouping of filesystems
356 for collective thresholds
357 Better configure test for mysqlclient availability
358 Various check_ntp fixes
360 1.4.7 29th March 2007
361 check_procs uses /usr/ucb/ps if available - fixes pst3 problems on Solaris
362 Fixed MKINSTALLDIRS problem in po/
363 ./configure now detects if possible to compile check_mysql
364 Fixed broken HELO in check_smtp
365 check_icmp now allows to set a minimum number of hosts required for successs (-m)
366 check_icmp fix for *BSD when running for long time
367 check_ping times out 1 second quicker if host is unreachable
368 Root plugins installed with world executable
369 check_sybase from contrib now maintained in MonitoringExchange
370 --with-nagios-user/group reinstated ./configure option
371 New --without-world-permissions ./configure option
373 1.4.6 5th February 2007
374 Reduced number of DNS lookups in check_ping and netutils.c for IPv6 configurations
375 Fixed compile problems with *BSD re: alloca.h
376 Fixed Solaris problems with check_swap (tested on Solaris 9)
377 Fixed check_swap for HP/UX where swapinfo command was incorrect
378 Fixed check_disk inode threshold checks, regressed at r1.4.4.
379 Fixed crit/warn for check_disk perf data
380 Fixed buffer overflow in check_procs
381 Fixed error handling for UNIX sockets in netutils.c
382 New -q and -o options for check_by_ssh which are handed over to ssh(1) as is
383 Synced with latest GNUlib
384 Fixed check_jabber always returns warning
386 1.4.5
387 Fixed bug in perl's is_hostname routine
389 1.4.4
390 New C based check_ntp. The perl version is now deprecated.
391 New check_apt plugin
392 Notice: plugins in contrib/ will start to be removed from this distribution.
393 Please check at http://www.monitoringexchange.org for contributed plugins
394 Major bug fixes to check_disk where values were incorrectly calculated and alerted on.
395 check_udp2 removed. check_udp is now linked to check_tcp.c
396 check_mailq now errors if the sub-program run returns non-zero return code. This would appear
397 as if mailqs were okay when the nagios user could not query the mail-queues
398 Compile problems with check_snmp fixed
400 1.4.3
401 Setuid plugins (check_dhcp, check_icmp) separated into plugins-root/. Run make install as root to install
402 SSL plugins work with gnutls as well as OpenSSL
403 check_mysql_query added to run arbitrary SQL commands, with threshold checking
404 libtool now required for development systems
405 Notice: check_udp (compiled from check_udp.c) will be deprecated in the next release.
406 check_udp2 should be used instead and will be renamed to check_udp
408 1.4.2
409 Fix for Redhat ES4 for check_dns and check_dig
411 1.4
412 IPv6 support in check_ping, check_by_ssh, check_http, check_ldap, check_smtp, check_tcp
413 Internationalisation support
414 Performance data added to most plugins
415 check_disk now using GNU coreutils code
416 New plugins - check_dhcp, check_icmp
417 contrib/check_citrix has been replaced by contrib/check_ica* (requires packet_utils.pm in libexec)
418 check_http --min changed to --pagesize, added max so min:max in check
419 check_vsz and check_rss deprecated - functionality moved into check_procs
420 check_swap % thresholds changed to measure amount free, instead of amount used
421 check_disk syntax changes for -p, -m/-M, defaults to MB instead of kB
422 check_procs -C expects no path for the command name