Module procfs::net

Expand description

Information about the networking layer.

This module corresponds to the /proc/net directory and contains various information about the networking layer.

Example

Here’s an example that will print out all of the open and listening TCP sockets, and their corresponding processes, if know. This mimics the “netstat” utility, but for TCP only. You can run this example yourself with:

cargo run –example=netstat

let all_procs = procfs::process::all_processes().unwrap();

// build up a map between socket inodes and process stat info:
let mut map: HashMap<u64, Stat> = HashMap::new();
for p in all_procs {
    let process = p.unwrap();
    if let (Ok(stat), Ok(fds)) = (process.stat(), process.fd()) {
        for fd in fds {
            if let FDTarget::Socket(inode) = fd.unwrap().target {
                map.insert(inode, stat.clone());
            }
        }
    }
}

// get the tcp table
let tcp = procfs::net::tcp().unwrap();
let tcp6 = procfs::net::tcp6().unwrap();
println!("{:<26} {:<26} {:<15} {:<8} {}", "Local address", "Remote address", "State", "Inode", "PID/Program name");
for entry in tcp.into_iter().chain(tcp6) {
    // find the process (if any) that has an open FD to this entry's inode
    let local_address = format!("{}", entry.local_address);
    let remote_addr = format!("{}", entry.remote_address);
    let state = format!("{:?}", entry.state);
    if let Some(stat) = map.get(&entry.inode) {
        println!("{:<26} {:<26} {:<15} {:<12} {}/{}", local_address, remote_addr, state, entry.inode, stat.pid, stat.comm);
    } else {
        // We might not always be able to find the process associated with this socket
        println!("{:<26} {:<26} {:<15} {:<12} -", local_address, remote_addr, state, entry.inode);
    }
}