IP expression resolver

[UmanShahzad]

I think this can technically be done in Python and other languages without any rocket science, but just throwing ideas here anyway:

An expression resolving subcommand that implements a very basic language specifically for text stream IP handling, kind of like awk but specialized for IPs. It could support e.g.

• awk-like args after parsing streaming text input
• comparison (<, <=, >, >=, ==)
• overlap check (OVERLAPS)
• contains check (IN)
• bit-length check (LEN)
• bitwise logic (|, &, !, ^, etc)
• boolean logic (AND, OR, etc)
• ternary op (<bool expr> ? <true case> : <false case>)

The following example would output all CIDR (not IP/range) entries in column 2 of a TSV that overlap with 1.1.1.0/24:

$ cat ip.tsv | ipinfo expr -d'\t' '$2 OVERLAPS 1.1.1.0/24 && isCidr($2) ? $2 : ""'

[UmanShahzad]

Most use cases can probably be done without a full expression resolver though, e.g. one tool to get all entries in column 2 of the TSV, piped into another tool like ipinfo tool overlap, piped into a ipinfo tool filterCidr, etc