Software
www.skarnet.org

s6-networking

What is it ?

s6-networking is a suite of small networking utilities for Unix systems. It includes command-line client and server management, TCP access control, privilege escalation across UNIX domain sockets, IDENT protocol management and clock synchronization.

If the underlying skalibs has been compiled with IPv6 support, s6-networking is IPv6-ready.

Installation

Requirements

• A POSIX-compliant system with a standard C development environment
• GNU make, version 3.81 or later
• skalibs version 2.4.0.0 or later. It's a build-time requirement. It's also a run-time requirement if you link against the shared version of the skalibs library.
• execline version 2.2.0.0 or later. It's a build-time and run-time requirement.
• s6 version 2.4.0.0 or later. It's a build-time and run-time requirement.
• s6-dns version 2.1.0.0 or later. It's a build-time requirement. It's also a run-time requirement if you link against the shared version of the s6-dns libraries.

Licensing

s6-networking is free software. It is available under the ISC license.

Download

• The current released version of s6-networking is 2.2.0.0.
• Alternatively, you can checkout a copy of the s6-networking git repository:

   git clone git://git.skarnet.org/s6-networking 

• There's also a GitHub mirror of the s6-networking git repository.

Compilation

• See the enclosed INSTALL file for installation details.

Upgrade notes

• This page lists the differences to be aware of between the previous versions of s6-networking and the current one.

Reference

Commands

All these commands exit 111 if they encounter a temporary error or hardware error, and 100 if they encounter a permanent error - such as a misuse. Short-lived commands exit 0 on success. Other exit codes are documented in the relevant page.

System clock synchronization

• The s6-clockadd program
• The s6-clockview program
• The s6-sntpclock program
• The s6-taiclock program
• The s6-taiclockd program

UCSPI TCP implementation

• The s6-tcpclient program
• The s6-tcpserver program
• The s6-tcpserver4 program
• The s6-tcpserver4-socketbinder program
• The s6-tcpserver4d program
• The s6-tcpserver6 program
• The s6-tcpserver6-socketbinder program
• The s6-tcpserver6d program

TCP access control

• The s6-tcpserver-access program

IDENT protocol implementation

• The s6-ident-client program
• The minidentd program

Miscellaneous utilities

• The s6-getservbyname program

Libraries

• The s6net library, containing:
• The ident library interface

s6-networking discussion

• s6-networking is discussed on the skaware mailing-list.

Similar work

• ucspi-tcp is the original inspiration for s6-networking. It works, but is unfortunately unmaintained by the author. s6-networking follows the same design principles.
• ipsvd is a similar program suite.