Linux: Please use socket with IPPROTO_ICMP instead of socket_raw

[jcdutton]

The equivalent in C:
Use the non raw socket.:
create_socket(&rts, &sock4, AF_INET, hints.ai_socktype, IPPROTO_ICMP,
hints.ai_family == AF_INET);
Instead of:
socktype = SOCK_RAW;
sock->fd = socket(family, SOCK_RAW, protocol);

Also please enable DF bit with something like this:
rts.pmtudisc = IP_PMTUDISC_DO is the options have it set.

The benefit of using the IPPROTO_ICMP method, is that then non-root users can use the ping.
Also, the SOCK_RAW is disabled entirely on Linux Ubuntu, so not even root can do it, and one gets this back from the program:
OsError(13, "Permission denied (os error 13)")
A temp fix for Ubuntu so that at least root can do SOCK_RAW is:
sudo sysctl "net.ipv4.ping_group_range=0 1"
But the better fix is using IPPROTO_ICMP instead.