creddy/src-tauri/src/clientinfo.rs

use netstat2::{AddressFamilyFlags, ProtocolFlags, ProtocolSocketInfo};
use sysinfo::{System, SystemExt, Pid, ProcessExt};

use crate::errors::*;
use crate::ipc::Client;


fn get_associated_pids(local_port: u16) -> Result<Vec<u32>, netstat2::error::Error> {
    let mut it = netstat2::iterate_sockets_info(
        AddressFamilyFlags::IPV4,
        ProtocolFlags::TCP
    )?;

    for (i, item) in it.enumerate() {
        let sock_info = item?;
        let proto_info = match sock_info.protocol_socket_info {
            ProtocolSocketInfo::Tcp(tcp_info) => tcp_info,
            ProtocolSocketInfo::Udp(_) => {continue;}
        };

        if proto_info.local_port == local_port
            && proto_info.remote_port == 12345
            && proto_info.local_addr == std::net::Ipv4Addr::LOCALHOST
            && proto_info.remote_addr == std::net::Ipv4Addr::LOCALHOST
        {
            return Ok(sock_info.associated_pids)
        }
    }
    Ok(vec![])
}


// Theoretically, on some systems, multiple processes can share a socket. We have to 
// account for this even though 99% of the time there will be only one.
pub fn get_clients(local_port: u16) -> Result<Vec<Client>, ClientInfoError> {
    let mut clients = Vec::new();    
    let mut sys = System::new();
    for p in get_associated_pids(local_port)? {
        let pid = Pid::from(p as i32);
        sys.refresh_process(pid);
        let proc = sys.process(pid)
            .ok_or(ClientInfoError::PidNotFound)?;

        let client = Client {
            pid: p,
            exe: proc.exe().to_string_lossy().into_owned(),
        };
        clients.push(client);
    }
    Ok(clients)
}