gather-cidr-map

gather-cidr-map collects IP (prefix) -> value mappings from stdin, gathers for each IP the last mapped value and outputs the mappings either grouped into the smallest number of prefixes (-p, the default) or from-to ranges (-r).

It can also output IPs not mapped to any value (only in the prefix output mode, not for ranges) when using the -u option.

The output format is either:

• a-b\tvalue for a range mapping
• a/n\tvalue for a prefix mapping
• any\tvalue for a range or prefix mapping for all IPv4+IPv6 IPs
• the \tvalue suffix is missing if there was no value set (note that the value is prefixed by a tab in the output)

The input is similar:

• input is split into lines
• on each line beginning and trailing whitespace is removed
• empty lines and lines starting with a # are ignored
• the line is split at the first whitespace block into IP (prefix) and value; if there is no whitespace the value is an empty string.

To simulate the behaviour of a routing table ("best match wins") you should sort the input to start with large prefixes (i.e. small numbers after the /).

Build

Clone with git, then run cargo build or cargo build --release. The binary will be in ./target/debug/ or ./target/release/.

Example

Input:

0.0.0.0/0        normal
10.0.0.0/8       private
172.16.0.0/12    private
192.168.0.0/16   private

Output: (without any options)

0.0.0.0/5	normal
8.0.0.0/7	normal
10.0.0.0/8	private
11.0.0.0/8	normal
12.0.0.0/6	normal
16.0.0.0/4	normal
32.0.0.0/3	normal
64.0.0.0/2	normal
128.0.0.0/3	normal
160.0.0.0/5	normal
168.0.0.0/6	normal
172.0.0.0/12	normal
172.16.0.0/12	private
172.32.0.0/11	normal
172.64.0.0/10	normal
172.128.0.0/9	normal
173.0.0.0/8	normal
174.0.0.0/7	normal
176.0.0.0/4	normal
192.0.0.0/9	normal
192.128.0.0/11	normal
192.160.0.0/13	normal
192.168.0.0/16	private
192.169.0.0/16	normal
192.170.0.0/15	normal
192.172.0.0/14	normal
192.176.0.0/12	normal
192.192.0.0/10	normal
193.0.0.0/8	normal
194.0.0.0/7	normal
196.0.0.0/6	normal
200.0.0.0/5	normal
208.0.0.0/4	normal
224.0.0.0/3	normal