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+NRPE Changelog
+==============
+
+[4.0.3](https://github.com/NagiosEnterprises/nrpe/releases/tag/nrpe-4.0.3) - 2020-04-28
+---------------------------------------------------------------------------------------
+**FIXES**
+- Fixed nasty_metachars not being read from config file (#235) (Sebastian Wolf)
+
+[4.0.2](https://github.com/NagiosEnterprises/nrpe/releases/tag/nrpe-4.0.2) - 2020-03-11
+---------------------------------------------------------------------------------------
+**FIXES**
+- Fixed buffer length calculations/writing past memory boundaries on some systems (#227, #228) (Andreas Baumann, hariwe, Sebastian Wolf)
+- Fixed use of uninitialized variable when validating requests (#229) (hariwe, Sebastian Wolf)
+
+[4.0.1](https://github.com/NagiosEnterprises/nrpe/releases/tag/nrpe-4.0.1) - 2020-01-22
+---------------------------------------------------------------------------------------
+**FIXES**
+* Fixed syslog flooding with CRC-checking errors when both plugin and agent were updated to version 4 (Sebastian Wolf)
+
+[4.0.0](https://github.com/NagiosEnterprises/nrpe/releases/tag/nrpe-4.0.0) - 2019-01-13
+---------------------------------------------------------------------------------------
+Note: This update includes security fixes which affect both the check_nrpe plugin and
+the NRPE daemon. The latest version of NRPE is still able to interoperate with previous
+versions, but for best results, both programs should be updated.
+
+**ENHANCEMENTS**
+* Added TLSv1.3 and TLSv1.3+ support for systems that have it (Nigel Yong, Rahul Golam)
+* Added IPv6 ip address to list of default allow_from hosts (Troy Lea)
+* Added -D option to disable logging to syslog (Tom Griep, Sebastian Wolf)
+* Added -3 option to force check_nrpe to use NRPE v3 packets
+* OpenRC: provide a default path for nrpe.cfg (Michael Orlitzky)
+* OpenRC: Use RC_SVCNAME over a hard-coded PID file (j-licht)
+
+**FIXES**
+* Checks for '!' now only occur inside the command buffer (Joni Eskelinen)
+* NRPE daemon is more resilient to DOS attacks (Leonid Vasiliev)
+* allowed_hosts will no longer test getaddrinfo records against the wrong protocol (dombenson)
+* nasty_metachars will now handle C escape sequences properly when specified in the config file (Sebastian Wolf)
+* Calculated packet sizes now struct padding/alignment when sending and receiving messages (Sebastian Wolf)
+* Buffer sizes are now checked before use in packet size calculation (Sebastian Wolf)
+* When using `include_dir`, individual files' errors do not prevent the remaining files from being read (Sebastian Wolf)
+
+
+[3.2.1](https://github.com/NagiosEnterprises/nrpe/releases/tag/nrpe-3.2.1) - 2017-08-31
+---------------------------------------------------------------------------------------
+**FIXES**
+* Change seteuid error messages to warning/debug (Bryan Heden)
+* Fix segfault when no nrpe_user is specified (Stephen Smoogen, Bryan Heden)
+* Added additional strings to error messages to remove duplicates (Bryan Heden)
+* Fix nrpe.spec for rpmbuild (Bryan Heden)
+* Fix error for drop_privileges when using inetd (xalasys-luc, Bryan Heden)
+
+
+[3.2.0](https://github.com/NagiosEnterprises/nrpe/releases/tag/nrpe-3.2.0) - 2017-06-26
+---------------------------------------------------------------------------------------
+**ENHANCEMENTS**
+* Added max_commands definition to nrpe.cfg to rate limit simultaneous fork()ed children (Bryan Heden)
+* Added -E, --stderr-to-stdout options for check_nrpe to redirect output (Bryan Heden)
+* Added support for Gentoo init (Troy Lea @box293)
+* Cleaned up code a bit, updated readmes and comments across the board (Bryan Heden)
+* Added -V, --version to nrpe and fixed the output (Bryan Heden)
+* Added different SSL error messages to be able to pinpoint where some SSL errors occured (Bryan Heden)
+* Updated logic in al parse_allowed_hosts (Bryan Heden)
+* Added builtin OpenSSL Engine support where available (Bryan Heden + @skrueger8)
+* Clean up compilation warnings (Bryan Heden)
+* Added more commented commands in nrpe.cfg (Bryan Heden)
+
+**FIXES**
+* Undefined check returns UNKNOWN (Bryan Heden)
+* Fix incompatibility with OpenSSL 1.1.0 via SECLEVEL distinction (Bryan Heden)
+* Fix ipv4 error in logfile even if address is ipv6 (Bryan Heden)
+* Fix improper valid/invalid certificate warnings (Bryan Heden)
+
+[3.1.1](https://github.com/NagiosEnterprises/nrpe/releases/tag/nrpe-3.1.1) - 2017-05-24
+---------------------------------------------------------------------------------------
+**FIXES**
+* The '--log-file=' or '-g' option is missing from the help (John Frickson)
+* check_nrpe = segfault when specifying a config file (John Frickson)
+* Alternate log file not being used soon enough (John Frickson)
+* Unable to compile v3.1.0rc1 with new SSL checks on rh5 (John Frickson)
+* Unable to compile nrpe-3.1.0 - undefined references to va_start, va_end (John Frickson)
+* Can't build on Debian Stretch, openssl 1.1.0c (John Frickson)
+* Fix build failure with -Werror=format-security (Bas Couwenberg)
+* Fixed a typo in `nrpe.spec.in` (John Frickson)
+* More detailed error logging for SSL (John Frickson)
+* Fix infinite loop when unresolvable host is in allowed_hosts (Nick / John Frickson)
+
+[3.1.0](https://github.com/NagiosEnterprises/nrpe/releases/tag/nrpe-3.1.0) - 2017-04-17
+---------------------------------------------------------------------------------------
+**ENHANCEMENTS**
+* Added option to nrpe.cfg.in that can override hard-coded NASTY_METACHARS (John Frickson)
+* While processing 'include_dir' statement, sort the files (Philippe Kueck / John Frickson)
+* nrpe can now write to a log file using 'log_file=' in nrpe.cfg (John Frickson)
+* check_nrpe can now write to a log file using '--log-file=' or '-g' options (John Frickson)
+
+**FIXES**
+* Added missing debugging syslog entries, and changed printf()'s to syslog()'s. (Jobst Schmalenbach)
+* Fix help output for ssl option (configure) (Ruben Kerkhof)
+* Fixes to README.SSL.md and SECURITY.md (Elan Ruusamäe)
+* Changed the 'check_load' command in nrpe.cfg.in (minusdavid)
+* Cleanup of config.h.in suggested by Ruben Kerkhof
+* Minor change to logging in check_nrpe (John Frickson)
+* Solaris 11 detection is broken in configure (John Frickson)
+* Removed function `b64_decode` which wasn't being used (John Frickson)
+* check_nrpe ignores -a option when -f option is specified (John Frickson)
+* Added missing LICENSE file (John Frickson)
+* Off-by-one BO in my_system() (John Frickson)
+* Got rid of some compiler warnings (Stefan Krüger / John Frickson)
+* Add SOURCE_DATE_EPOCH specification support for reproducible builds. (Bas Couwenberg)
+* nrpe 3.0.1 allows TLSv1 and TLSv1.1 when I configure for TLSv1.2+ (John Frickson)
+* "Remote %s accepted a Version %s Packet", please add to debug (John Frickson)
+* nrpe 3.0.1 segfaults when key and/or cert are broken symlinks (John Frickson)
+* Fixed a couple of typos in docs/NRPE.* files (Ludmil Meltchev)
+* Changed release date to ISO format (yyyy-mm-dd) (John Frickson)
+* Fix systemd unit description (Bas Couwenberg)
+* Add reload command to systemd service file (Bas Couwenberg)
+* fix file not found error when updating version (Sven Nierlein)
+* Spelling fixes (Josh Soref)
+* Return UNKNOWN when check_nrpe cannot communicate with nrpe and -u set (John Frickson)
+* xinetd.d parameter causes many messages in log file (John Frickson)
+* Fixes for openssl 1.1.x (Stephen Smoogen / John Frickson)
+* PATH and other environment variables not set with numeric nrpe_user (John Frickson)
+* rpmbuild -ta nrpe-3.0.1.tar.gz failed File not found: /etc/init.d/nrpe (bvandi / John Frickson)
+
+[3.0.1](https://github.com/NagiosEnterprises/nrpe/releases/tag/nrpe-3.0.1) - 2016-09-08
+---------------------------------------------------------------------------------------
+**FIXES**
+* _set_rc: command not found reported by init script (John Frickson)
+* Version string contains name (John Frickson)
+* Changes to get 'rpmbuild' to work - nrpe.spec file outdated (John Frickson)
+* typo in startup/default-xinetd.in (Philippe Kueck)
+* debug output missing command name (Philippe Kueck)
+* /usr/lib/tmpfiles.d/ndo2db.conf should have 'd' type, not 'D' (John Frickson)
+* Fixes in parse_allowed_hosts() and called functions (Jobst Schmalenbach / John Frickson)
+* nrpe.cfg: 'debug' statement needs to be first in file (Jobst Schmalenbach / John Frickson)
+
+[3.0.0](https://github.com/NagiosEnterprises/nrpe/releases/tag/nrpe-3.0.0) - 2016-08-01
+---------------------------------------------------------------------------------------
+**SECURITY**
+* Fix for CVE-2014-2913
+* Added function to clean the environment before forking. (John Frickson)
+
+**ENHANCEMENTS**
+* Added support for optional config file to check_nrpe. With the new SSL
+ parameters, the line was getting long. The config file is specified with
+ --config-file=<path> or -f <path> parameters. The config file must look
+ like command line options, but the options can be on separate lines. It
+ MUST NOT include --config-file (-f), --command (-c) or --args (-a). If any
+ options are in both the config file and on the command line, the command line
+ options are used.
+* make can now add users and groups using "make install-groups-users" (John Frickson)
+* Added "nrpe-uninstall" script to the same directory nrpe get installed to (John Frickson)
+* Updated code so configure && make will work on AIX, HP-UX, Solaris, OS X.
+ There should be no errors or warnings. Let me know if any errors or
+ warning appear (John Frickson)
+* Added command-line option to prevent forking, since some of the init
+ replacements (such as systemd, etc.) don't want daemons to fork (John Frickson)
+* Added autoconf macros and additional files to better support multi-platform
+ config and compile. The default will still set up to install to
+ /usr/local/nagios but I added a new configure option:
+ '--enable-install-method=<method>'. If <method> is 'opt', everything will
+ install to '/opt/nagios'. If <method> is 'os', installation will be to O/S-
+ and distribution-specific locations, such as /usr/sbin, /usr/lib/nagios,
+ /etc/nagios, and so on.
+* Added additional init and inetd config files to support more systems,
+ including SuSE, Debian, Slackware, Gentoo, *BSD, AIX, HP-UX, Solaris, OS X.
+* Added listen_queue_size as configuration option (Vadim Antipov, Kaspersky Lab)
+* Reworked SSL/TLS. See the README.SSL.md file for full info. (John Frickson)
+* Added support for version 3 variable sized packets up to 64KB. nrpe will
+ accept either version from check_nrpe. check_nrpe will try to send a
+ version 3 packet first, and fall back to version 2. check_nrpe can be forced
+ to only send version 2 packets if the switch `-2` is used. (John Frickson)
+* Added extended timeout syntax in the -t <secs>:<status> format. (ABrist)
+
+**FIXES**
+* Fixed configure to check more places for SSL headers/libs. (John Frickson)
+* Added ifdefs for complete_SSL_shutdown to compile without SSL. (Matthew L. Daniel)
+* Renamed configure.in to configure.ac and added check for sigaction (John Frickson)
+* Replaced all instances of signal() with sigaction() + blocking (John Frickson)
+* check_nrpe does not parse passed arguments correctly (John Frickson)
+* NRPE should not start if cannot write pid file (John Frickson)
+* Fixed out-of-bounds error (return code 255) for some failures (John Frickson)
+* Connection Timeout and Connection Refused messages need a new line (Andrew Widdersheim)
+* allowed_hosts doesn't work, if one of the hostnames can't be resolved by dns (John Frickson)
+* allowed_hosts doesn't work with a hostname resolving to an IPv6 address (John Frickson)
+* Return UNKNOWN when issues occur (Andrew Widdersheim)
+* NRPE returns OK if check can't be executed (Andrew Widdersheim)
+* nrpe 2.15 [regression in Added SRC support on AIX - 2.14] (frphoebus)
+* compile nrpe - Solaris 9 doesn't have isblank() (lilo, John Frickson)
+* sample configuration for check_load has crazy sample load avg (ernestoongaro)
+
+
+2.15 - 09/06/2013
+-----------------
+* Now compiles on HP-UX (Grant Byers)
+* Added support for IPv6 (Leo Baltus, Eric Stanley)
+
+
+
+2.14 - 12/21/2012
+-----------------
+* Added configure option to allow bash command substitutions, disabled by default [bug #400] (Eric Stanley)
+* Patched to shutdown SSL connection completely (Jari Takkala)
+* Added SRC support on AIX (Thierry Bertaud)
+* Updated RPM SPEC file to support creating RPMs on AIX (Eric Stanley)
+* Updated logging to support compiling on AIX (Eric Stanley)
+
+
+
+2.13 - 11/11/2011
+-----------------
+* Applied Kaspersky Labs supplied patch for extending allowed_hosts (Konstantin Malov)
+* Fixed bug in allowed_hosts parsing (Eric Stanley)
+* Updated to support compiling on Solaris 10 (thanks to Kevin Pendleton)
+
+
+
+2.12 - 03/10/2008
+-----------------
+* Fix for unterminated multiline plugin (garbage) output (Krzysztof Oledzki)
+
+
+
+2.11 - 12/26/2007
+-----------------
+* Added lib64 library paths to configure script for 64-bit systems (John Maag)
+* Added --with-ssl-lib configure script option
+* Added --with-log-facility option to control syslog logging (Ryan Ordway and Brian Seklecki)
+
+
+
+2.10 - 10/19/2007
+-----------------
+* Moved PDF docs to docs/ subdirectory, added OpenOffice source document
+* A critical result is now returned for child processed that die due to a signal (Klas Lindfors)
+
+
+
+2.9 - 08/13/2007
+----------------
+* Fixed bug with --with-nrpe-group configure script option (Graham Collinson)
+* Fixed bug with check_disk thresholds in sample config file (Patric Wust)
+* Added NRPE_PROGRAMVERSION and NRPE_MULTILINESUPPORT environment variables
+ for scripts that need to detect NRPE version and capabilities (Gerhard Lausser)
+* Added asprintf() support for systems that are missing it (Samba team)
+
+
+
+2.8.1 - 05/10/2007
+-----------------
+* Fixed configure script error with user-specified NRPE group
+
+
+
+2.8 - 05/08/2007
+---------------
+* Added support for multiline plugin output (limited to 1KB at the moment) (Matthias Flacke)
+
+
+
+2.8b1 - 03/14/2007
+-----------------
+* Changes to sample config files
+* Added ';' as an additional prohibited metachar for command arguments
+* Updated documentation and added easier installation commands
+
+
+
+2.7.1 - 03/08/2007
+------------------
+* Changed C++ style comment to C style to fix compilation errors on AIX (Ryan McGarry)
+
+
+
+2.7 - 02/18/2007
+----------------
+* Patches for detection SSL header and library locations (Andrew Boyce-Lewis)
+* NRPE daemon will now partially ignore non-fatal configuration file errors and attempt to startup (Andrew Boyce-Lewis)
+
+
+
+2.6 - 12/11/2006
+----------------
+* Added -u option to check_nrpe to return UNKNOWN states on socket timeouts (Bjoern Beutel)
+* Added connection_timeout variable to NRPE daemon to catch dead client connections (Ton Voon)
+* Added graceful timeout to check_nrpe to ensure connection to NRPE daemon is properly closed (Mark Plaksin)
+
+
+
+2.5.2 - 06/30/2006
+------------------
+* Fixed incorrect service name in sample xinetd config file
+* Added note on how to restart inetd for OpenBSD users (Robert Peaslee)
+* Fix for nonblocking accept()s on systems that define EAGAIN differently than EWOULDBLOCK (Gerhard Lausser)
+* Fix to (re)allow week random seed (Gerhard Lausser)
+
+
+
+2.5.1 - 04/09/2006
+------------------
+* Patch to fix segfault if --no-ssl option is used (Sean Finney/Peter Palfrader)
+
+
+
+2.5 - 04/06/2006
+----------------
+* (Re)added allowed_hosts option for systems that don't support TCP wrappers
+* Fix for SSL errors under Solaris 8 (Niels Endres)
+* Fix for config file directory inclusion on ReiserFS (Gerhard Lausser)
+
+
+
+2.4 - 02/22/2006
+----------------
+* Added option to allow week random seed (Gerhard Lausser)
+* Added optional command line prefix (Sean Finney)
+* Added ability to reload config file with SIGHUP
+* Fixed bug with location of dh.h include file
+* Fixed bug with disconnect message in debug mode
+
+
+
+2.3 - 01/23/2006
+----------------
+* Spec file fixes
+* Removed errant PID file debugging code
+* Fixed problem with trimming command definitions
+
+
+
+2.2 - 01/22/2006
+----------------
+* Spec file fix
+* Patch to add Tru64 and IRIX support (Ton Voon)
+* Updated config.sub and config.guess
+* Fixed bug with config file lines with only whitespace
+* Fixed bug with missing getopt() command line option for -V
+* Removed sample FreeBSD init script (now maintained by FreeBSD port)
+* Added config file option for writing a PID file
+
+
+
+2.1 - 01/19/2004
+----------------
+* Replaced host access list with TCP wrapper support
+* Removed length restrictions for command names and command lines
+* Configure script patch for getopt_long on Solaris
+* Bug fixes for accept() on HP-UX 11.0
+* Init script for SUSE Linux (Subhendu Ghosh)
+* SSL protocol used is now limited to TLSv1
+* Any output from plugins after first line is now ignored before
+ plugin process is closed
+
+
+
+2.0 - 09/08/2003
+----------------
+* Added support for passing arguments to command
+* NRPE daemon can no longer be run as root user/group
+* Added getopt support
+* Added 'include' variable to config file to allow inclusion
+ of external config files
+* Added 'include_dir' variable to allow inclusion of external
+ config files in directories (with recursion)
+* Added native SSL support (Derrick Bennett)
+* Added my_strsep(), as Solaris doesn't have strsep()
+* Added license exemption for use with OpenSSL
+
+
+
+1.8 - 01/16/2003
+----------------
+* Daemon now closes stdio/out/err properly (James Peterson)
+* Makefile changes (James Peterson)
+* Mode command line option bug fix in daemon
+* Fixed incorrect command line options in check_nrpe plugin
+
+
+
+1.7 - 01/08/2003
+----------------
+* Spec file updates and minor bug fixes (James Peterson)
+* Bug fix with default nrpe port definition
+* Added sample xinetd config file (nrpe.xinetd)
+* Bug fix for command_timeout variable (James Peterson)
+
+
+
+1.6 - 12/30/2002
+----------------
+* Updated sample commands to match new plugin argument format
+* Added sample init scripts for FreeBSD and Debian (Andrew Ryder)
+* Syntax changes (-H option specifies host name in check_nrpe,
+ -c option specifies config file in nrpe)
+* Added command_timeout directive to config file to allow user
+ to specify timeout for executing plugins
+* Added spec file and misc patches for building RPMs (James Peterson)
+* Added --with-nrpe-port config directive (James Peterson)
+
+
+
+1.5 - 06/03/2002
+----------------
+* Added setuid/setgid option to config file (suggested by Marek Cervenka)
+
+
+
+1.4 - 06/01/2002
+----------------
+* Changed STATE_UNKNOWN to value of 3 instead of -1 (old style)
+* Minor doc and sample config file changes
+
+
+
+1.3 - 02/21/2002
+----------------
+* Name and version change
+* Ignore SIGHUP, minor cleanup (Jon Andrews)
+
+
+
+1.2.5 - 12/22/2001
+------------------
+* Implemented Beej's sendall() to handle partial send()s
+* Added instructions on running under xinetd to README
+* Removed some old crud
+
+
+
+1.2.4 - 02/22/2001
+------------------
+* I forgot what changes I made. Go figure...
+
+
+
+1.2.3 - 12/21/2000
+------------------
+* A bit more documentation on configuring command definitions for the plugin
+
+
+
+1.2.2 - 06/05/2000
+------------------
+* Fixed error in docs for running under inetd using TCP wrappers
+* Replaced old email address in src/netutils.h with new one
+
+
+
+1.2.1 - 05/07/2000
+------------------
+* Removed trapping of SIGCHLD
+* Changed wait4() to waitpid() to allow compilation on HP-UX and AIX
+
+
+
+1.2.0 - 04/18/2000
+------------------
+* Server forks twice after accepting a client connection, so as to prevent the
+ creation of zombies
+
+
+
+1.1.5 - 04/07/2000
+------------------
+* Fixed a small bug where one debug message was not getting logged properly
+
+
+
+1.1.4 - 03/30/2000
+------------------
+* Added option to disable/enable debug messages using the debug option in the
+ config file
+
+
+
+1.1.3 - 03/11/2000
+------------------
+* Changed config file to use an absolute path
+* Changed all debug output to use syslog (Rene Klootwijk)
+* No convert all data to network order before sending it and convert it back to
+ host order when receiving it. This makes it possible to mix Solaris and Linux,
+ e.g. running check_nrpe on Linux and nrpe on Solaris. (Rene Klootwijk)
+
+
+
+1.1.2 - 03/07/2000
+------------------
+* Removed unnecessary code in signal handler routine
+* Unused signals are no longer trapper
+
+
+
+1.1.1 - 02/28/2000 - RKL
+---------------------------
+* Modified syslog code to include string describing the error code.
+* Changed hardcoded number in signal handler to its name. This prevented nrpe
+ to run on Solaris.
+* Fixed race condition in accept loop. The result of accept should also be
+ checked for EINTR.
+* Modified recv and send function calls to compile without warnings on Solaris.
+* Modified configure.in,configure and Makefile.in to include nsl and socket libs
+ for Solaris.
+* Modified the signal handler to reestablish itself after being called.
+
+
+
+1.1 - 02/24/2000 - Rene Klootwijk <rene@klootwijk.org>
+-----------------
+* Added ability to bind nrpe to a specific interface by specifying the address
+ of this interface in the nrpe.cfg file (e.g. server_address=192.168.2.3)
+
+
+
+1.0 - 02/16/2000
+------------------
+* Added ability to run as a service under inetd
+
+
+
+1.0b6 - 02/01/2000
+------------------
+* Added configure script
+* Netutils functions from the NetSaint plugins is now used
+* Reset SIGCHLD to default behavior before calling popen() to
+ prevent race condition with pclose() (Reported by Rene Klootwijk)
+* Cleaned up code
+
+
+
+1.0b5 - 01/10/2000
+------------------
+* Added init script contributed by Jacob L
+* Incorporated syslog code and other patches contributed by Jacob L
+
+
+
+1.0b4 - 11/04/1999
+------------------
+* Changed 'allowed_ip' option in configuration file to
+ 'allowed_hosts' and added support for multiple hosts
+* Minor buffer overflow protection fixes
+* main() returned STATE_UNKNOWN on successful launch, changed to STATE_OK (jaclu@grm.se)
+* Added syslog support (jaclu@grm.se)