Adding upstream version 4.1.0.upstream/4.1.0upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

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+![Nagios!](https://www.nagios.com/wp-content/uploads/2015/05/Nagios-Black-500x124.png)
+
+[![Build Status](https://travis-ci.org/NagiosEnterprises/nrpe.svg?branch=master)](https://travis-ci.org/NagiosEnterprises/nrpe)
+
+ 🔴 🔴 🔴
+***Notice: As of NRPE version 4.0.1, this project is deprecated. It will not receive any more bugfixes or features, except to resolve security issues.***
+ 🔴 🔴 🔴
+
+Nagios Remote Plugin Executor (NRPE)
+====================================
+
+For installation instructions and information on the design overview
+of the NRPE addon, please read the PDF documentation that is found in
+this directory: `docs/NRPE.pdf`.
+
+If you are upgrading from a previous version, you'll want to
+check the [Changelog](CHANGELOG.md) and then run `./update-cfg.pl` to
+add the new SSL parameters to your config file.
+
+TL;DR: You can jump straight to [Compiling](#compiling) and
+[Installing](#installing)
+
+You'll want to read up on the [Security](SECURITY.md) document
+regarding NRPE, no doubt.
+
+And make sure to check out the [SSL Readme](README.SSL.md) as well,
+if you plan on using encryption methods to transmit `nrpe` data.
+
+
+Purpose
+-------
+The purpose of this addon is to allow you to execute Nagios
+plugins on a remote host in as transparent a manner as possible.
+
+
+Contents
+--------
+
+There are two pieces to this addon:
+
+1. `nrpe`
+
+   This program runs as a background process on the
+   remote host and processes command execution requests
+   from the check_nrpe plugin on the Nagios host.
+   Upon receiving a plugin request from an authorized
+   host, it will execute the command line associated
+   with the command name it received and send the
+   program output and return code back to the
+   check_nrpe plugin
+
+2. `check_nrpe` 
+
+   This is a plugin that is run on the Nagios host
+   and is used to contact the NRPE process on remote
+   hosts.  The plugin requests that a plugin be
+   executed on the remote host and wait for the NRPE
+   process to execute the plugin and return the result.
+   The plugin then uses the output and return code
+   from the plugin execution on the remote host for
+   its own output and return code.
+
+
+Compiling
+---------
+
+If you are having any problems compiling on your system, 
+please let us know (preferrably with fixes). Most users 
+should be able to compile `nrpe` and the `check_nrpe` 
+plugin with the following commands...
+
+    ./configure
+    make all
+
+***HINT:*** `./configure --help`
+
+**NOTE:** If you're cloning from GitHub, you'll need to run
+`autoconf` first.
+
+**NOTE:** Since the check_nrpe plugin and nrpe daemon run 
+on different machines (the plugin runs on the Nagios host and 
+the daemon runs on the remote host), you will have to compile 
+the nrpe daemon on the target machine.
+
+
+Installing
+----------
+
+You have a few options here. The binaries created from `make all` 
+were placed in your `src/` directory. You can either copy these 
+where they need to be, or you can run any of the following 
+`make install` options:
+
+* `make install-groups-users`
+
+   Add the users and groups sepcified during `./configure`. Defaults
+   to nagios and nagios, respectively. You can override these with the
+   `./configure --with-nrpe-user=USER --with-nrpe-group=GROUP`.
+
+* `make install`
+
+   This will run both `install-plugin` and `install-daemon`.
+
+* `make install-plugin`
+
+   This will install the plugin by default in 
+   `/usr/local/nagios/libexec`. You can override this 
+   behavior by using the `--with-pluginsdir=DIR` flag during
+   `./configure`.
+
+* `make install-daemon`
+
+   This will install the plugin by default in 
+   `/usr/local/nagios/bin`. You can override this 
+   behavior by using the `--prefix=DIR` or 
+   `--bindir=DIR` flags during `./configure`.
+
+* `make install-config`
+
+   This will install the sample config by default in 
+   `/usr/local/nagios/etc`. You can override this 
+   behavior by using the `--with-pkgsysconfdir=DIR` 
+   flag during `./configure`.
+
+* `make install-inetd`
+
+   `./configure` attempts to determine your inetd type.
+   If it finds it, it will install the appropriate inetd 
+   script in the proper location. You can help it out with
+   `./configure --with-inetd-type=TYPE` where `TYPE` can be
+   one of: `inetd`, `xinetd`, `systemd`, `launchd`, 
+   `smf10`, `smf11`.
+
+* `make install-init`
+
+   `./configure` attempts to determine the appropriate
+   init type. If it figures it out, will install the
+   required startup script. You can help it out with
+   `./configure --with-init-type=TYPE` where TYPE can be
+   one of: `bsd`, `sysv`, `systemd`, `launchd`, `smf10`, 
+   `smf11`, `upstart`, `openrc`.
+
+If you used all the necessary `./configure` flags, you shouldn't
+need to tweak your config file any at this point, and a simple
+`service nrpe start` or `systemctl start nrpe.service` should
+work just fine.
+
+Configuring
+-----------
+
+A sample config file for the NRPE daemon are located in the
+`sample-config/` subdirectory.
+
+If you used the proper flags during `./configure`, this file
+should contain all of the appropriate information as a starting
+point.
+
+
+Running Under `inetd` or `xinetd`
+---------------------------------
+
+If you plan on running nrpe under inetd or xinetd and making use
+of TCP wrappers, you need to add a line to your `/etc/services`
+file as follows (modify the port number as you see fit)
+
+    nrpe            5666/tcp    # NRPE
+
+The run `make install-inetd` to copy the appropriate file, or
+add the appropriate line to your `/etc/inetd.conf`.
+
+**NOTE:** If you run nrpe under inetd or xinetd, the server_port
+and allowed_hosts variables in the nrpe configuration file are
+ignored.
+
+
+* `inetd`
+
+   After running `make install-inetd`, your `/etc/inetd.conf` file will
+   contain lines similar to the following:
+
+       # Enable the following entry to enable the nrpe daemon
+       #nrpe stream tcp nowait nagios /usr/local/nagios/bin/nrpe nrpe -c /usr/local/nagios/etc/nr
+       # Enable the following entry if the nrpe daemon didn't link with libwrap
+       #nrpe stream tcp nowait nagios /usr/sbin/tcpd /usr/local/nagios/bin/nrpe -c /usr/local/nag
+
+   Un-comment the appropriate line, then Restart inetd:
+
+      /etc/rc.d/init.d/inet restart
+
+   OpenBSD users can use the following command to restart inetd:
+
+      kill -HUP `cat /var/run/inet.pid`
+
+   Then add entries to your `/etc/hosts.allow` and `/etc/hosts.deny`
+   file to enable TCP wrapper protection for the nrpe service.
+   This is optional, although highly recommended.
+
+
+* `xinetd`
+
+   If your system uses xinetd instead of inetd, `make install-inetd`
+   will create a file called `nrpe` in your `/etc/xinetd.d`
+   directory that contains a file similar to this:
+
+      # default: off
+      # description: NRPE (Nagios Remote Plugin Executor)
+      service nrpe
+      {
+          disable         = yes
+          socket_type     = stream
+          port            = @NRPE_PORT@
+          wait            = no
+          user            = nagios
+          group           = nagios
+          server          = /usr/local/nagios/bin/nrpe
+          server_args     = -c /usr/local/nagios/etc/nrpe.cfg --inetd
+          only_from       = 127.0.0.1
+          log_on_failure  += USERID
+      }
+
+   * Replace `disable = yes` with `disable = no`
+   * Replace the `127.0.0.1` field with the IP addresses of hosts which
+     are allowed to connect to the NRPE daemon.  This only works if xinetd was
+     compiled with support for tcpwrappers.
+   * Add entries to your `/etc/hosts.allow` and `/etc/hosts.deny`
+     file to enable TCP wrapper protection for the nrpe service.
+     This is optional, although highly recommended.
+
+   * Restart xinetd:
+
+         /etc/rc.d/init.d/xinetd restart
+
+
+Configuring Things On The Nagios Host
+---------------------------------------
+
+Examples for configuring the nrpe daemon are found in the sample
+`nrpe.cfg` file included in this distribution.  That config file
+resides on the remote host(s) along with the nrpe daemon.  The
+check_nrpe plugin gets installed on the Nagios host.  In order
+to use the check_nrpe plugin from within Nagios, you will have
+to define a few things in the host config file.  An example
+command definition for the check_nrpe plugin would look like this:
+
+    define command{
+        command_name           check_nrpe
+        command_line           /usr/local/nagios/libexec/check_nrpe -H $HOSTADDRESS$ -c $ARG1$
+        }
+
+In any service definitions that use the nrpe plugin/daemon to
+get their results, you would set the service check command portion
+of the definition to something like this (sample service definition
+is simplified for this example):
+
+    define service{
+        host_name              someremotehost
+        service_description    someremoteservice
+        check_command          check_nrpe!yourcommand
+        ... etc ...
+        }
+
+where `yourcommand` is a name of a command that you define in
+your `nrpe.cfg` file on the remote host (see the docs in the
+sample nrpe.cfg file for more information).
+
+
+License Notice
+--------------
+
+NRPE - Nagios Remote Plugin Executor
+
+Copyright (c) 2017 Nagios Enterprises
+
+This program is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 2 of the License, or
+(at your option) any later version.
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program; if not, write to the Free Software
+Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+
+
+Questions?
+----------
+
+If you have questions about this addon, or encounter problems getting things
+working along the way, your best bet for an answer or quick resolution is to check the
+[Nagios Support Forums](https://support.nagios.com/forum/viewforum.php?f=5).