Networking Software

Programs related to networking.

To facilitate navigating in this list, projects are categorized by their purpose, authorship, and current state. Each project entry lists the categories it pertains to. Clicking on a category name will bring a listing of all projects in that category.

Additionally, a list of related projects is provided where applicable. Each element in that list is a link to the corresponding project entry.

Clicking on a project's name will bring this project's entry as a separate page (a permalink).

Hovering your mouse over the version information of a project shows the list of changes introduced by that version.

Sort controls below allow you to order the list either lexicographically or by the most recent release date, in both directions.

Using the Search control, you can select projects by name. Shell-style globbing patterns (wildcards) are accepted.

(Return to the project listing)


Version: 1.0  —  2019-10-10
Initial release.

A tool for monitoring the expiration times of remote SSL certificates via HTTPS. Can be used either as a Nagios plugin or as a standalone tool.


Version: 1.9.3  —  May 12, 2015
* ftp

An old inability to allow other names than the canonical name has
been corrected.  This means that a machine entry in the .netrc file
will now be used as expected.  Previously any alias name was replaced
by the corresponding canonical name, before reading the .netrc file.

The internal command `hash' accepts a suffixed letter to the size
argument, like `12k', instead of 12288.  Made a minor change to the
syntax of the command itself, allowing size changes independently
of activation of hash markings.  After a transfer the summary gives
the speed as `Mbytes/s', `kbytes/s', or `bytes/s'.

The .netrc file can be overridden by the environment variable NETRC.
Of even higher precedence is the new option `-N/--netrc'.  The access
to the resulting file, whatever method, is now denied unless it is a
regular file.

* ifconfig

Better command line parsing on BSD and Solaris systems.  Touch only
changeable flags on all systems.

* logger

The ability to use numerical facilities is restored to full range.

* ping, ping6

The ability to specify a pattern as payload is corrected.

* syslogd

A new switch `-T/--local-time' makes the service ignore a time
stamp passed on by the remote host, recording instead the local
time at the moment the message was received.  As a short form of
`--pidfile', the switch `-P' is new.

In common with other syslogd implementations, rsyslogd and sysklogd,
there has for a long time existed an attack vector based on large
facility numbers, made public in CVE-2014-3684.  This is now mended
in our code base.

* telnetd

The ability to autologin a client, without using authentication,
is now functional in the expected manner, i.e., the prompt for a
user name is suppressed in favour of an immediate password prompt.

In a setting where the client is using a UTF-8 encoding, it was
common to observe strange characters in most responses.  This was
caused by the server daemon, due to incomplete purging of internal
protocol data.  The issue should now be resolved.

* whois

Improved cooperation with servers like `', `',
and `'.

Inetutils, or GNU Internet Utilities, are the basic internet utilities of the GNU Operating System.


(Not released)



Version: 1.3  —  2011-03-31
* Use IPv6 URLs as proposed by RFC 2732

The address part of an IPv6 URL must be either an IPv6 address in
numeric notation *enclosed in square brackets* or a host name, e.g.:



A Jabber Over HTTP tunnel. It enables access to Jabber servers from behind firewalls which do not allow outgoing sockets on port 5222.


Version: 1.2  —  2018-10-26
* Implement heartbeat event

* Add auxiliary program: ifactive

* Fix file descriptor leak


Jumper monitors network interfaces for certain kinds of traffic and starts preconfigured external programs when such traffic is detected. It is designed mainly to bring up network links (such as VPN and the like) on demand.

Related projects:


Version: 8.13  —  2022-01-02
* Fix compilation with mailutils 3.14

* sed

** fix replacement of the requested Nth pattern instance

This fixes sed expressions like s/X/@/2.

Bug repored in:

** rewrite regular expression scanner

* SPF: return PermError if more than one record is published

Mailfromd is a general-purpose mail filtering daemon for Sendmail, Postfix and MeTA1. It is able to filter both incoming and outgoing messages using criteria of arbitrary complexity, supplied by the administrator in the form of a script file. The daemon interfaces with the MTA using Milter or PMilter protocols.

Related projects:


(Not released)

A modular remote management system for Ping903. Allows the user to inspect configuration of the running server, add or remove IP addresses, synchronize the monitored IP list with the Nagios configuration or an SQL database etc.

Related projects:


Version: 1.7  —  2022-01-02
* Changes in configuration preprocessing

** Each included file is preprocessed separately.

The built-in preprocessor is removed.  The #include and #include_once
statements are now regular configuration statements.  Any files
included as a result of #include or #include_once are preprocessed
separately.  This differs from prior versions, were all includes were
expanded first, the obtained material passed to the m4 and the
resulting output was then parsed.

This means that:

1. The mess with two preprocessors (built-in and external) is now

2. Macros defined in a source file don't pollute the namespace of
another sources.

3. Error locations can be accurately determined.

4. Preprocessor can emit forceful diagnostics (see below) to properly
identify erroneous or otherwise suspicious constructs.

** The `pp-setup' file is gone.

By default, the preprocessor is started as `m4 -s -P' with additional
set of -I options and eventual -D or -U options if these are used in
the command line of pies.  Apart from this, no additional set up is

** The precedence of -I options is fixed

The -I options are placed in the m4 command line before the options
that configure the default search path.

* New forceful diagnostics statements

** #warning "TEXT"

Emits warning.

** #error "TEXT"

Emits error message.  Further parsing continues, but will end with

** #abend "TEXT"

Emits error message and stops further processing immediately.

If `#error' or `#abend' is encountered, the effect is the same
as if syntax error has been detected.  If it occurs at pies
startup, the program will terminate abnormally.  If it occurs as
part of the reload sequence in a running instance of pies, the
configuration file will be rejected and old configuration will remain
in effect.

GNU pies (pronounced p-yes) is a program invocation and execution supervisor. This utility allows to execute usual foreground-mode applications in detached mode, as if they were daemons. It combines the fucntionality of init and inetd programs. It can be used to control complex multi-component software.

Related projects:


Version: 0.8  —  2020-03-19
* Use red-black trees to index the IP list.


Ping903 is designed to periodically monitor a very large number of remote hosts using ICMP ECHO packets. The package is built using the client-server architecture. The main component (ping903) is a daemon that sits in memory and wakes up periodically to send certain number of ICMP echo packets to a preconfigured number of hosts and to collect replies. The resulting round-trip statistics is made available via REST API.

Related projects:


Version: 1.6  —  2008-12-06
* Configuration file raddb/config

The syslog statement takes an optional 4th argument specifying syslog
tag to use, e.g.:

    channel default {
	    syslog radiusd;

* New attributes

** GNU-Server-Address

Holds IP address of the RADIUS server that recieved the
request. Notice, that the value of this attribute is "" if
there are no `listen' statement in your `raddb/config'.
** GNU-Server-Port

Holds UDP port number of the RADIUS server that recieved the request.

* Automake function AM_GNU_RADIUS is provided, for checking if
GNU Radius is installed from scripts.

* Guile support requires Guile version 1.8 or later.

* Bugfixes
** Pass NAS-IP-Address to mlc_stop_query	

GNU Radius is an extensible and scalable authentication and accounting server.


Version: 1.8  —  2021-05-17
* Syslog support

New option '-S FACILITY' switches diagnostic output to the given
syslog facility.


A simple tool for forwarding content of a local file to the stdin of a program running on a remote host via TCP. The tool was created when I needed to run GNU Mailman in a docker container without MTA in it. It implements a slightly modified version of TCPMUX protocol. The same binary (rpipe) serves both as a server (on the remote end) and as a client (on the local end).

Related projects:


Version: 2.3  —  2022-07-16
* Fix invalid memory addressing in remopt command

* Fix building with flex >= 2.6.1 (EOF check)

GNU Rush is a Restricted User Shell. It is intended for use with ssh, rsh and similar remote access programs. Using a sophisticated configuration file, Rush gives you complete control over the command lines users can execute, system resources they can use, etc. In particular, it allows to run remote programs in a chrooted environment.

Related projects:


(Not released)