Incorrect MAC address

[Rage997]

Hi all,

On my machine (2019 Mac Book Pro running Mojave) the following code:

extern crate mac_address;

use mac_address::get_mac_address;

fn main() {
    match get_mac_address() {
        Ok(Some(ma)) => {
            println!("MAC addr = {}", ma);
            println!("bytes = {:?}", ma.bytes());
        }
        Ok(None) => println!("No MAC address found."),
        Err(e) => println!("{:?}", e),
    }
}

retrieves an incorrect MAC address. Any idea why?
~

[repnop]

unfortunately I don't have access to that kind of machine, so I'll need more context. what is the "incorrect MAC address" and why do you believe it to be incorrect?

[Rage997]

Let me elabatore. I get the loopback address 00-00-00-00-00-00 which is uninteresting (not incorrect, but uninteresting). People are generally interested in the network adapter (en0) mac address

I am currently writing a small rust library to generate a serial number linked to hardware-specific identifiers such as mac address. On my code, this is how I get the MAC to address, in case you might find it helpful:

#[cfg(target_os = "macos")]
pub fn get() {
    // On mac, you can get all the mac addresses by running /sbin/ifconfig | grep ether
    
	let output = Command::new("/sbin/ifconfig")
        .args(["en0"])
	.output()
	.expect("Failed to retrieve hardware information");

    assert!(output.status.success());
	let tmp =  String::from_utf8(output.stdout)
		.expect("Found invalid UTF-8");
	match tmp
		.lines()
		.find(|l| l.contains("ether"))// find the line containing the UUID
		.unwrap_or("")
		.split(' ')
		.nth(1)
		{
		None => panic!("No network interface found"),
		Some(id) => {
            println!("The MAC address is {}", id);
			// return id.to_string();
		}
	}    
}