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(*
* Copyright (c) 2010 Anil Madhavapeddy <anil@recoil.org>
* Copyright (c) 2014 David Sheets <sheets@alum.mit.edu>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*)
open Sexplib.Std
exception Parse_error of string * string with sexp
let need_more x = Parse_error ("not enough data", x)
type t = string (* length 6 only *)
let compare = String.compare
(* Raw MAC address off the wire (network endian) *)
let of_bytes_exn x =
if String.length x <> 6
then raise (Parse_error ("MAC is exactly 6 bytes", x))
else x
let of_bytes x = try Some (of_bytes_exn x) with _ -> None
let int_of_hex_char c =
let c = int_of_char (Char.uppercase c) - 48 in
if c > 9
then if c > 16
then c - 7 (* upper hex offset *)
else -1 (* :;<=>?@ *)
else c
let is_hex i = i >=0 && i < 16
let bad_char i s =
let msg = Printf.sprintf "invalid character '%c' at %d" s.[i] i
in Parse_error (msg, s)
let parse_hex_int term s i =
let len = String.length s in
let rec hex prev =
let j = !i in
if j >= len then prev
else let c = s.[j] in
let k = int_of_hex_char c in
if is_hex k
then (incr i; hex ((prev lsl 4) + k))
else if List.mem c term
then prev
else raise (bad_char j s)
in
let i = !i in
if i < len
then if is_hex (int_of_hex_char s.[i])
then hex 0
else raise (bad_char i s)
else raise (need_more s)
let parse_sextuple s i =
let m = String.create 6 in
try
let p = !i in
m.[0] <- Char.chr (parse_hex_int [':';'-'] s i);
if !i >= String.length s
then raise (need_more s)
else
let sep = [s.[!i]] in
(if !i - p <> 2 then raise (Parse_error ("hex pairs required",s)));
incr i;
for k=1 to 4 do
let p = !i in
m.[k] <- Char.chr (parse_hex_int sep s i);
(if !i - p <> 2 then raise (Parse_error ("hex pairs required",s)));
incr i;
done;
let p = !i in
m.[5] <- Char.chr (parse_hex_int [] s i);
(if !i - p <> 2 then raise (Parse_error ("hex pairs required",s)));
m
with Invalid_argument "Char.chr" ->
raise (Parse_error ("address segment too large",s))
(* Read a MAC address colon-separated string *)
let of_string_exn x = parse_sextuple x (ref 0)
let of_string x = try Some (of_string_exn x) with _ -> None
let chri x i = Char.code x.[i]
let to_string ?(sep=':') x =
Printf.sprintf "%02x%c%02x%c%02x%c%02x%c%02x%c%02x"
(chri x 0) sep
(chri x 1) sep
(chri x 2) sep
(chri x 3) sep
(chri x 4) sep
(chri x 5)
let to_bytes x = x
let sexp_of_t m = Sexplib.Sexp.Atom (to_string m)
let t_of_sexp m =
match m with
| Sexplib.Sexp.Atom m -> of_string_exn m
| _ -> raise (Failure "Macaddr.t: Unexpected non-atom in sexp")
let broadcast = String.make 6 '\255'
let make_local bytegenf =
let x = String.create 6 in
(* set locally administered and unicast bits *)
x.[0] <- Char.chr ((((bytegenf 0) lor 2) lsr 1) lsl 1);
for i = 1 to 5 do x.[i] <- Char.chr (bytegenf i) done;
x
let get_oui x =
((chri x 0) lsl 16) lor ((chri x 1) lsl 8) lor (chri x 2)
let is_local x = (((chri x 0) lsr 1) land 1) = 1
let is_unicast x = ((chri x 0) land 1) = 0
|
