Plans to use DGRAM sockets for ICMP ?

[snmgian]

Hi,

I'm running net-ping gem on macOS High Sierra, and at least Net::Ping::TCP and Net::Ping::External are working ok (the ones I tested).

I tried Net::Ping::ICMP. I see it requires cap2 gem, so it fails with:

Caused by:
LoadError: cannot load such file -- cap2

cap2 is used to check whether there's net_raw enabled or not, because Net::Ping::ICMP uses raw socket.

Why does it use raw sockets? Is there any plan to use DGRAM sockets? Apple's ping utility uses DGRAM when the user is not root.

[chernesk]

I'll check into that. Sorry about the late response. I'll plan to have a response on this within the next week.

[chernesk]

I'm not sure, but I never did get to look at this. Life took over and I got too busy. That sounds like a good idea. I'll try to take a look in the next week, but gladly accept pull requests.

[djberg96]

I did find this:

https://apple.stackexchange.com/questions/312857/how-does-macos-allow-standard-users-to-ping

Based on this, it may just be a matter of:

if Process.euid == 0
  socket_type = Socket::SOCK_RAW
else
  socket_type = Socket::SOCK_DGRAM
end

# and later...

socket = Socket.new(Socket::PF_INET, socket_type, Socket::IPPROTO_ICMP)

Which may obviate the need for cap2 (?)

[djberg96]

Hm, I still get a permissions issue on Linux, I'll have to test this at home on the mac.

[djberg96]

Yep, looks like that only works on Macs.