rs-machineid 0.2.0

Get the unique machine ID of any host (without admin privileges).
Documentation 
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use std::process::Command;

use hmac::Mac;

type HmacSha256 = hmac::Hmac<sha2::Sha256>;

pub fn exec(cmd: &str) -> Option<String> {
    #[cfg(unix)]
    let output = Command::new("sh").arg("-c").arg(cmd).output().ok()?;

    #[cfg(windows)]
    let output = Command::new("cmd").arg("/C").arg(cmd).output().ok()?;

    if output.status.success() {
        String::from_utf8(output.stdout)
            .ok()
            .map(|s| s.trim().to_string())
    } else {
        None
    }
}

#[cfg(target_os = "linux")]
pub fn read_file(path: &str) -> Option<String> {
    match std::fs::read_to_string(path) {
        Ok(content) => Some(content.trim().to_string()),
        Err(_) => None,
    }
}

pub fn sanitize(id: &str) -> String {
    id.chars()
        .filter(|c| c.is_ascii_graphic() || c.is_ascii_punctuation() || c.is_ascii_alphanumeric())
        .collect()
}

pub fn hashed_id(machine_id: &str, app_id: &str) -> String {
    let mut mac = HmacSha256::new_from_slice(app_id.as_bytes()).unwrap();
    mac.update(machine_id.as_bytes());
    let hash = mac.finalize();
    hex::encode(hash.into_bytes())
}