Fragmented Classless Inter-Domain Routing (FCIDR)

Overview

fcidr

crates.io

Fragmented Classless Inter-Domain Routing (FCIDR)

A library exposing a data structure to represent a set of CIDR ranges as well as an interface to compute set operations over CIDRs.

This data structure can be applied, for example, in configuring firewalls that implicitly deny (AWS Security Groups) using a rule set that explicitly expresses rules for both allow and deny.

Note
Currently, only IPv4 is supported. IPv6 support is tracked by #6.

CLI

This project also publishes a binary application for use on the command line to support composing chains of set operations on CIDRs by reading from standard input.

Installation

For now, crates.io is the only place this is being distributed.

cargo install fcidr

Usage

Fragmented Classless Inter-Domain Routing (FCIDR)

Usage: fcidr [CIDR] <COMMAND>

Commands:
  complement  Compute the complement of the input CIDR(s) [aliases: !, not]
  difference  Compute the set difference between the input CIDR(s) and another CIDR [aliases: -, exclude, minus]
  union       Compute the set union of the input CIDR(s) and another CIDR [aliases: +, include, plus]
  help        Print this message or the help of the given subcommand(s)

Arguments:
  [CIDR]  The input CIDR range and first operand to the computation. If omitted, input is taken from stdin. In this way, multiple computations can be chained together

Options:
  -h, --help     Print help
  -V, --version  Print version`

Example

fcidr 10.0.0.0/8 difference 10.0.64.0/20 | fcidr difference 10.0.82.0/24 | fcidr union 10.0.82.74/31
10.0.0.0/18
10.0.80.0/23
10.0.82.74/31
10.0.83.0/24
10.0.84.0/22
10.0.88.0/21
10.0.96.0/19
10.0.128.0/17
10.1.0.0/16
10.2.0.0/15
10.4.0.0/14
10.8.0.0/13
10.16.0.0/12
10.32.0.0/11
10.64.0.0/10
10.128.0.0/9
fcidr 10.0.0.0/8 difference 10.0.64.0/20 | fcidr difference 10.0.82.0/24 | fcidr union 10.0.82.74/31 | fcidr complement
0.0.0.0/5
8.0.0.0/7
10.0.64.0/20
10.0.82.0/26
10.0.82.64/29
10.0.82.72/31
10.0.82.76/30
10.0.82.80/28
10.0.82.96/27
10.0.82.128/25
11.0.0.0/8
12.0.0.0/6
16.0.0.0/4
32.0.0.0/3
64.0.0.0/2
128.0.0.0/1

Alternative concise syntax:

fcidr 10.0.0.0/8 + 127.0.0.0/16 | fcidr - 10.64.0.0/16 | fcidr !
0.0.0.0/5
8.0.0.0/7
10.64.0.0/16
11.0.0.0/8
12.0.0.0/6
16.0.0.0/4
32.0.0.0/3
64.0.0.0/3
96.0.0.0/4
112.0.0.0/5
120.0.0.0/6
124.0.0.0/7
126.0.0.0/8
127.1.0.0/16
127.2.0.0/15
127.4.0.0/14
127.8.0.0/13
127.16.0.0/12
127.32.0.0/11
127.64.0.0/10
127.128.0.0/9
128.0.0.0/1
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Comments
  • Expose set operation API

    Expose set operation API

    Add methods for Fcidr Union, Intersection, Difference, Complement which operate on something that is Into<Fcidr>.

    This could be an extension or replacement of the current include and exclude methods.

    opened by nicholaschiasson 0
  • Refactor

    Refactor

    Clean up code a bit, for example, expose an Fcidr error type (don't just use the Cidr error type everywhere).

    Also investigate ways to improve error handling, removing impossible error scenarios from the code so that not everything needs to return a result. For example, Fcidr::new should not need to return a result, and frankly, neither should Fcidr::include or Fcidr::exclude.

    opened by nicholaschiasson 0
Owner
Nicholas Omer Chiasson
Nicholas Omer Chiasson
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