No nonsense FTP/TFTP server

 Posted on July 29, 2019  |  Joachim Nilsson

Tired of confusing configuration files and security features you don’t need? Try uftpd! Supports FTP and TFTP No configuration file Defaults to port ftp/tcp and tftp/udp found in /etc/services, or custom port(s) Serves files from the ftp user’s $HOME, as specified in /etc/passwd, or custom path Can run from inetd(8) or as a standalone daemon Can be built and installed as a .deb file, with debconf support Can run as root, with chroot and privsep, or as a regular user Supports TFTP blocksize negotiation, RFC 2348 Basically, it just works! [Read More]

Merecat httpd

 Posted on July 19, 2019  |  Joachim Nilsson

Merecat started out as a pun at Mongoose, but is now useful for actual web serving purposes. It is however not a real Meerkat, merely yet another copycat, forked from the great thttpd created by Jef Poskanzer. Merecat expands on the features originally offered by thttpd, but still has a limited feature set: Virtual hosts Basic .htpassd and .htaccess support URL-traffic-based throttling CGI/1.1 HTTP/1.1 Keep-alive Built-in gzip deflate using zlib HTTPS support using OpenSSL/LibreSSL, works with Let’s Encrypt! [Read More]

N E M E S I S

 Posted on June 16, 2019  |  Joachim Nilsson

Nemesis is a command-line network packet crafting and injection utility for UNIX-like and Windows systems. Well suited for testing Network Intrusion Detection Systems, firewalls, IP stacks and a variety of other tasks. As a command-line driven utility, it is perfect for automation and scripting. Nemesis can natively craft and inject ARP, DNS, ETHERNET, ICMP, IGMP, IP, OSPF, RIP, TCP and UDP packets. Using the IP and the Ethernet injection modes, almost any custom packet can be crafted and injected. [Read More]

System & Process Supervisor for Linux

 Posted on May 27, 2019  |  Joachim Nilsson

watchdogd(8) is an advanced system and process supervisor daemon, primarily intended for embedded Linux and server systems. By default it periodically kicks the system watchdog timer (WDT) to prevent it from resetting the system. In its more advanced guise it monitors critical system resources, supervises the heartbeat of processes, records deadline transgressions, and initiates a controlled reset if needed. When a system comes back up after a reset, watchdogd determines the reset cause and records it in a file for later analysis by an operator or network management system (NMS). [Read More]

The original PIM-SM daemon

 Posted on April 28, 2019  |  Joachim Nilsson

Protocol Independent Multicast, PIM, allows existing networks to route IP multicast, regardless of what unicast routing protocol is in use. It is designed to use existing routing tables to make its multicast routing decisions. PIM-SM is suitable for sparsely located multicast subscribers, for dense mode operation mrouted is recommended, and for static multicast routing smcroute may be used. pimd is a lightweight standalone PIM-SM/SSM v2 multicast routing daemon. It is the original USC (netweb/catarina. [Read More]

The original multicast routing daemon

 Posted on February 24, 2019  |  Joachim Nilsson

mrouted is an implementation of the IPv4 multicast routing protocol DVMRP, RFC 1075. It is capable of turning a UNIX workstation, or Linux device, into a multicast router with tunnelling1 support. The Distantance Vector Multicast Routing Protocol (DVMRP), derived from RIP, is suitable for smaller/dense networks. It employs the “flood and prune” method, where multicast is flooded until neighboring routers opt out from unwanted multicast groups. For a more thorough explanation of the protocol, see RFC 1075. [Read More]

Static Multicast Routing Daemon

 Posted on February 11, 2019  |  Joachim Nilsson

SMCRoute is a daemon and command line tool to manipulate the multicast routing table in the UNIX kernel. Both FreeBSD and Linux kernels are supported, but it may work on other systems as well. SMCRoute can be used as an alternative to dynamic multicast routing daemons like mrouted or pimd when (only) static multicast routes should be maintained or no proper signalling exists. Problems? See the Multicast HowTo for help! [Read More]

Fast init for Linux systems

 Posted on February 23, 2018  |  Joachim Nilsson

Finit is a simple alternative to SysV init and systemd, reverse engineered from the EeePC fastinit ten years ago by Claudio Matsuoka — “gaps filled with frog DNA …” Finit supports runlevels, process monitoring, and starting services on demand using the built-in inetd, or by triggering a condition. E.g., “don’t start this service until basic networking is available”, or “wait until syslogd has started”. For more details, see the online documentation. [Read More]

Minix Editline

 Posted on September 7, 2017  |  Joachim Nilsson

This is a line editing library for UNIX. It can be linked into almost any program to provide command line editing and history. It is call compatible with the FSF readline library, but is a fraction of the size (and offers fewer features). The small size (<30k), lack of dependencies (no ncurses needed!) and the free license should make this library interesting to many embedded developers seeking a replacement for the GNU readline library. [Read More]

Small and Simple DDNS Client

 Posted on August 14, 2017  |  Joachim Nilsson

In-a-dyn is a small and simple Dynamic DNS, DDNS, client with HTTPS support. It is commonly available in many GNU/Linux distributions, used in off-the-shelf routers and Internet gateways to automate the task of keeping your DNS record up to date with any IP address changes from your ISP. It can also be used in installations with redundant (backup) connections to the Internet. Supported Providers The following is a curated list of some of the natively supported DDNS providers. [Read More]