gazagnaire.org / ocaml-arp-cache
System ARP cache reader
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README.md

arp-cache#

Read the host ARP cache to resolve IPv4 addresses to MAC addresses, in pure OCaml.

  • Linux: reads /proc/net/arp directly
  • macOS/BSD: parses the output of arp -a

The line parsers (parse_proc_net_arp, parse_arp_a_output) are pure; only table, lookup and lookup_mac touch the operating system. For the ARP wire protocol codec, see nox-arp.

Installation#

Install with opam:

$ opam install arp-cache

If opam cannot find the package, it may not yet be released in the public opam-repository. Add the overlay repository, then install it:

$ opam repo add samoht https://tangled.org/gazagnaire.org/opam-overlay.git
$ opam update
$ opam install arp-cache

Usage#

Arp_cache.table () returns the cache as a list of { ip; mac; interface } entries; Arp_cache.lookup_mac ip resolves a single address. See arp_cache.mli for the full API. The bundled arp-cache command prints the table.

Licence#

MIT