Photo by Micah Tindell on Unsplash

Photo by Micah Tindell on Unsplash

Have a Bash with the Zing network utility

Zinger

Article from ADMIN 77/2023
By
We show you how to implement the zero-packet Ping utility, Zing, as a Bash shell script.

Zing is a zero-packet network utility similar to Ping that I first introduced in December 2022 [1]. Zing has the distinct advantage that hosts without Ping capability can be zinged without sending network packets. Thus, zinging a remote host with multiple zing requests is not a "Ping flood" [2] attack, making Zing a network-safe utility that does not add network traffic.

Zing is implemented in a variety of programming languages, is open source, and is available for download [3]. Yet the idea occurred to me to implement zing as a Bash shell script, which has the advantage of avoiding recompilation and of customization or tailoring for specific idiosyncrasies of a system platform or application.

Netcat

The netcat utility (nc) is a key command-line application and "Swiss army knife" of network utilities [4]. Netcat is described as a simple Unix utility that reads and writes data across network connections by the TCP or UDP protocol [5]. Originally developed for Unix, netcat has since been ported to many other computer platforms. Thus, netcat has the advantage of being somewhat ubiquitous across different operating systems.

The decision to implement zing with netcat in a shell script left one major design consideration decision. Put simply: Which shell to use? I develop on macOS, so Zsh seemed a likely obvious choice. However, I also work with Linux, so other shells were possible.

Ultimately I opted to go with Bash because it is ubiquitous, and I have done much more scripting for work and tinkering with the Bash shell. Moreover, Bash scripting

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