alt Hacker News> It turns out you can create a UDP socket with a protocol flag, which allows you to send the ping rootless
This is wrong, despite the Rust library in question's naming convention. You're not creating a UDP socket. You're creating an IP (AF_INET), datagram socket (SOCK_DGRAM), using protocol ICMP (IPPROTO_ICMP). The issue is that the rust library apparently conflates datagram and UDP, when they're not the same thing.
You can do the same in C, by calling socket(2) with the above arguments. It hinges on Linux allowing rootless pings from the GIDs in
$ sysctl net.ipv4.ping_group_range
net.ipv4.ping_group_range = 999 59999
EDIT2: more spelling mistakes
Replies
Could you please explain me the difference? As UDP is the "User Datagram Protocol" when I read about datagrams I always think about UDP and though it was just a different way of saying the same thing. Maybe "datagram" is supposed to be the packet itself, but you're still sending it via UDP, right?
Thank you.
I assumed this was what was happening, but conflating network layer protocols with transport layer ones isn't great.
I'm surprised that pedantic zealots, like me in my youth, haven't risen up and flooded rust with issues over it way before this though.