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|
-module(fib_macos).
-behaviour(fib_behaviour).
-include("fib_macos.hrl").
-export([default_table/0, current_table/0, tables/0]).
-export([list/1]).
-export([monitor/1]).
-export([parse_pf_route_packet/1]).
%% MacOS has no tables.
default_table() ->
?TABLE.
current_table() ->
?TABLE.
tables() ->
{ok, [?TABLE]}.
list(?TABLE) ->
Netstat = os:cmd("netstat -rn"),
List = string:split(string:trim(Netstat), [$\n], all),
do_list(List, []);
list(Table) ->
{error, {no_table, Table}}.
monitor(?TABLE) ->
spawn_link(fun () ->
fib_pf_route_socket:open(fun (_) -> noop end, fun parse_pf_route_packet/1)
end);
monitor(Table) ->
{error, {no_table, Table}}.
%% rt_msghdr struct followed by rt_metrics and a list of sockaddr
%% MacOS 12
parse_pf_route_packet(<<% struct rt_msghdr (len removed)
?RTM_VERSION:8/little-unsigned-integer,
Type:8/little-unsigned-integer,
Index:32/little-unsigned-integer,
Flags:32/little-signed-integer,
Addrs:32/little-signed-integer,
Pid:32/little-signed-integer,
Seq:32/little-signed-integer,
Errno:32/little-signed-integer,
Use:32/little-signed-integer,
Inits:32/little-unsigned-integer,
% struct rt_metrics
Locks:32/little-unsigned-integer,
Mtu:32/little-unsigned-integer,
Hopcount:32/little-unsigned-integer,
Expire:32/little-signed-integer,
Recv:32/little-unsigned-integer,
Send:32/little-unsigned-integer,
Ssthresh:32/little-unsigned-integer,
Rtt:32/little-unsigned-integer,
Rttvar:32/little-unsigned-integer,
Pksent:32/little-unsigned-integer,
State:32/little-unsigned-integer,
Filler1:32/little-unsigned-integer,
Filler2:32/little-unsigned-integer,
Filler3:32/little-unsigned-integer,
% List of sockaddrs
BinaryAddrs/binary
>>) ->
Rt = #macos_rt{type = Type, ifp_index = Index, flags = Flags, addrs = Addrs, pid = Pid, seq = Seq, errno = Errno, use = Use,
metrics_init = Inits, metrics_lock = Locks, mtu = Mtu, hopcount = Hopcount, expire = Expire, recvpipe = Recv,
sendpipe = Send, ssthresh = Ssthresh, rtt = Rtt, rttvar = Rttvar, pksent = Pksent, state = State,
filler = {Filler1, Filler2, Filler3}},
parse_rt(Rt, BinaryAddrs).
parse_rt(Rt0, BinaryAddrs) ->
Rt1 = Rt0#macos_rt{type = maps:get(Rt0#macos_rt.type, ?RTM, Rt0#macos_rt.type),
flags = bitmask(?RTF, Rt0#macos_rt.flags),
addrs = bitmask(?RTA, Rt0#macos_rt.addrs),
metrics_init = bitmask(?RTV, Rt0#macos_rt.metrics_init),
metrics_lock = bitmask(?RTV, Rt0#macos_rt.metrics_lock)},
logger:warning("fib_macos:monitor Rt = ~p~nBinary: ~p", [Rt1, BinaryAddrs]),
Rt = get_addrs(Rt1#macos_rt.addrs, BinaryAddrs, Rt1),
logger:warning("fib_macos:monitor Rt = ~p", [Rt]),
Rt.
get_addrs([_Type | Rest], <<0:32/little-unsigned-integer, Binary/binary>>, Rt) ->
get_addrs(Rest, Binary, Rt);
get_addrs([Type | Rest], <<Len:8/little-unsigned-integer, Family:8/little-unsigned-integer, Content/binary>>, Rt) ->
logger:error("fib_macos:get_addrs() ~p len=~p family=~p ~nbinary ~p", [Type, Len, Family, Content]),
ToRead = case Type of
netmask -> Len - 1;
_Other -> Len - 2
end,
<<BinaryAddr:ToRead/binary, Binary/binary>> = Content,
Idx = string:str(record_info(fields, macos_rt), [Type]),
logger:warning("fib_macos:get_addrs() - get_addr ~p = ~p~nRest ~p~nBinRest = ~p", [Type, BinaryAddr, Rest, Binary]),
get_addrs(Rest, Binary, setelement(Idx+1, Rt, process_address(Family, BinaryAddr)));
get_addrs([], _, Rt) ->
Rt.
%% sockaddr_in, without the zeros (? only in netmasks)
process_address(?AF_INET, <<_Port:16/little-unsigned-integer, A, B, C, D>>) ->
{A, B, C, D};
%% sockaddr_in full ; _Zero is `sin_zero`.
process_address(?AF_INET, <<_Port:16/little-unsigned-integer, A, B, C, D, _Zero:64/little-unsigned-integer>>) ->
{A, B, C, D};
%% ???????? netmask in a RTM_GET message. see fib_macos_SUITE:pckt_rt_get.
process_address(255, <<255, 255, A, B, C, D>>) ->
{A, B, C, D};
process_address(Family, Data) ->
logger:error("macos:process_address: no clause for family ~p = ~p", [Family, Data]),
{Family, Data}.
bitmask(List, Integer) ->
bitmask(List, Integer, []).
bitmask([{V, Name} | Rest], I, Acc) ->
if
(I band V) =:= V ->
bitmask(Rest, I, [Name | Acc]);
true ->
bitmask(Rest, I, Acc)
end;
bitmask([], _, Acc) ->
lists:reverse(Acc).
do_list([], Acc) ->
Acc;
do_list([[] | Rest], Acc) ->
do_list(Rest, Acc);
%% Header "Routing Tables"
do_list([[$R, $o, $u, $t, $i, $n, $g | _] | Rest], Acc) ->
do_list(Rest, Acc);
%% Header "Internet"/"Internet6"
do_list([[$I, $n, $t, $e, $r, $n, $e, $t | _] | Rest], Acc) ->
do_list(Rest, Acc);
%% Header fields
do_list([[$D, $e, $s, $t, $i, $n, $a, $t, $i, $o, $n | _] | Rest], Acc) ->
do_list(Rest, Acc);
%% Data line
do_list([Line | Rest], Acc) ->
[Destination, Gateway, Flags, Netif | Expire] = string:lexemes(Line, [$\s, $\t]),
{DestIp, Scope, Netmask} = case Destination of
"default" -> {default, undefined, undefined};
IPStr -> fib_util:parse_ip_address_with_netmask(IPStr)
end,
GW = case Gateway of
[$l, $i, $n, $k, $# | Num] ->
{link, list_to_integer(Num)};
GWStr ->
case inet:parse_address(GWStr) of
{ok, GwIP} -> GwIP;
{error, einval} -> {mac, GWStr}
end
end,
Route = #{destination => DestIp, netmask => Netmask, scope => Scope, gateway => GW, flags => [flag(F) || F <- Flags], interface => Netif, expire => Expire},
do_list(Rest, [Route | Acc]).
flag($1) -> proto1;
flag($2) -> proto2;
flag($3) -> proto3;
flag($B) -> blackhole;
flag($b) -> broadcast;
flag($C) -> cloning;
flag($c) -> prcloning;
flag($D) -> dynamic;
flag($G) -> gateway;
flag($H) -> host;
flag($I) -> ifscope;
flag($i) -> ifref;
flag($L) -> llinfo;
flag($M) -> modified;
flag($m) -> multicast;
flag($R) -> reject;
flag($r) -> router;
flag($S) -> static;
flag($U) -> up;
flag($W) -> wascloned;
flag($X) -> xresolve;
flag($Y) -> proxy;
flag($g) -> global.
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