bogdanp / racket-net-ip

Utilities for working with IP addresses in Racket.

net-ip

Utilities for working with IP addresses in Racket.

Documentation

The documentation is hosted on docs.racket-lang.org.

License

net-ip is licensed under the 3-Clause BSD license.

racket-net-ip's Issues

Proposal: add a network-last-address function

I was pleasantly surprised to find this library when I needed it, so thanks!

I found myself needing to calculate IP ranges from cidr blocks.
I came up with the following:

#lang racket

;; LIBRARY

(require net/ip)

(define (network-last-address net)
  (number->ipv4-address
   (+ (sub1 (network-size net))
      (ip-address->number (network-address net)))))

;; APPLICATION

(define (ip-range net)
  (values (ip-address->string (network-address net))
          (ip-address->string (network-last-address net))))

(ip-range (make-network "10.0.0.0/16"))

Which got me wondering if it makes sense to expose a network-last-address function in this library.

minor documentation bugs

bytes->ipv6-address claims to require 4 bytes as input, which seems to be a little short for an ipv6 address.

Both bytes->ipv*-address functions claim that an execption is raised if the bytes are not in big-endian order. While the result might not match the expectation of the caller, an exception cannot be raised if the input bytes are not in big-endian order. How about

Unpack a byte array in big endian order into an IPv* address. 
Must be exactly * bytes long, otherwise an exn:fail:contract? is raised.

replacing * with the correct number, of course :-)