CODEWITHSUNDEEP
schemeracket
hsrv
hsrv

Reputation: 1570

sending ICMPv6 ping request

How to send a ICMPv6 ping request with Racket or Scheme?

There is https://docs.racket-lang.org/net/index.html, but it has almost nothing about the internet level protocols.

There is https://docs.racket-lang.org/net2/index.html, but it seems unfinished or abandoned.

Upvotes: 1

Views: 114

Answers (1)

Greg Hendershott
Greg Hendershott

Reputation: 16250

Racket supplies functions to work with the transport layer protocols TCP and UDP on all the platforms Racket supports (e.g. *nix, macOS, Windows).

But as far as I know it does not for lower network layer functionality such as ICMP (for IPv4 or IPv6).

Racket does supply an FFI, through which you could call the appropriate OS-specific functions that might let you do this. However, depending on what you want to accomplish, it might be simpler to use process to run a command like ping -- then read-line the Racket input port piped from the subprocess standard output, and parse that to get the information you need. (If you have questions about the details of using process, that would probably make for a good, separate question to post here.)

Update: Instead of process you could probably just use system:

#lang racket/base

(require racket/port
         racket/system)

(with-output-to-string
  (lambda () (system "ping -c 1 127.0.0.1")))

That returns a string like:

"PING 127.0.0.1 (127.0.0.1): 56 data bytes\n64 bytes from 127.0.0.1: icmp_seq=0 ttl=64 time=0.068 ms\n\n--- 127.0.0.1 ping statistics ---\n1 packets transmitted, 1 packets received, 0.0% packet loss\nround-trip min/avg/max/stddev = 0.068/0.068/0.068/0.000 ms\n"

Upvotes: 3

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