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About

This was originally written for the Cloudflare Systems Internship application. It is written in Rust and directly interfaces with the Linux syscalls socket(), sendto(), recv(), etc. For reference, as of time of writing, uname reports 5.2.21 #1-NixOS SMP x86_64 GNU/Linux.

Repository location github.com/zyklotomic/ping

Building it

cargo build

The resulting binary will be located at./target/debug/ping.

Running it

ping 1.0.0
Ethan Tsz Hang Kiang @zyklotomic
A cute little `ping` in Rust

USAGE:
    ping [OPTIONS] <dest>

FLAGS:
    -h, --help       Prints help information
    -V, --version    Prints version information

OPTIONS:
    -c, --count <count>          Stop sending after <count> many packets have been sent.
    -i, --interval <interval>    Wait <interval> seconds between sending each packet. Default is one second.
    -t <ttl>                     ttl

ARGS:
    <dest>    Target destination. Only Ipv4 supported

Notes

Relevant permissions need to be set to run ping.

Update sysctl paramater net.ipv4.ping_group_range to include your group id (id -g).

$ id -g
1000
$ sudo sysctl -w net.ipv4.ping_group_range="0 1000"
net.ipv4.ping_group_range = 0 2000

To run without root, enable 'setuid' bit.

$ sudo chown root:root ./target/debug/ping
$ sudo chmod u+s ./target/debug/ping
$ sudo chmod g+s ./target/debug/ping

Directly pulled from https://echorand.me/posts/my-own-ping/ . Pulled from under Implementation and Parting Notes. Thank you to Amit for that very helpful article with which I wouldn't have been able to write this without.

TODO

Complete refactoring of this so that it isn't such spaghetti. Use tokio? Check the code comments.