gen_icmp

ICMP implementation for Erlang using socket (so for now only Unix support).

Usage

To send ICMP echo request as unprivileged user (works on macOS and Linux if user group is within sysctl net.ipv4.ping_group_range):

{ok, Socket} = gen_icmp:open().

Addr = {127, 0, 0, 1}.

ok = gen_icmp:echoreq(Socket, Addr, <<1,2,3,4>>).

receive
    {icmp, Addr, {echorep, #{data := <<1,2,3,4>>}}} -> ok
end.

If you want to be sure of message order you can use seq option:

{ok, Socket} = gen_icmp:open().

Addr = {127, 0, 0, 1}.

ok = gen_icmp:echoreq(Socket, Addr, <<1,2,3,4>>, [{seq, 0}]).
ok = gen_icmp:echoreq(Socket, Addr, <<5,6,7,8>>, [{seq, 1}]).

receive
    {icmp, Addr, {echorep, #{seq := Seq, data := Data}}} ->
      io:write("Received reply seq=~B data=~p~n", [Seq, Data])
end.

License

See Apache 2.0.