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use std::convert::From;
use std::fs;
use std::path::Path;
use std::fmt;
use std::str::from_utf8_unchecked;
#[path = "util.rs"]
mod util;
use util::xtob;
#[path = "macros.rs"]
#[macro_use]
mod macros;
#[derive(Debug, Clone, Copy)]
pub struct Node([u8; 6]);
impl From<[u8; 6]> for Node {
fn from(xs: [u8; 6]) -> Self {
Node(xs)
}
}
impl Node {
#[cfg(target_os = "linux")]
pub fn new(interface: &str) -> Self {
let dir = "/sys/class/net";
let mut node: [u8; 6] = Default::default();
let content = fs::read_to_string(Path::new(dir).join(interface).join("address"))
.unwrap_or("00:00:00:00:00:00".to_owned());
let bs = content.as_bytes();
for (idx, &x) in [0, 3, 6, 9, 12, 15].iter().enumerate() {
node[idx] = xtob(bs[x], bs[x + 1]).unwrap_or_default();
}
Node(node)
}
pub fn id(self) -> [u8; 6] {
self.0
}
}
impl fmt::Display for Node {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
let xs = self.0;
let mut bs: [u8; 17] = [b':'; 17];
bytes_format!(bs, xs, 0, 0, 1,
3, 4,
6, 7,
9, 10,
12, 13,
15, 16);
unsafe {
f.write_str(from_utf8_unchecked(&bs))
}
}
}
#[cfg(test)]
mod tests {
use super::*;
#[test]
#[cfg(target_os = "linux")]
fn test_lo_nodeid() {
assert_eq!(Node::new("lo").id(), [0; 6]);
}
#[test]
#[cfg(target_os = "linux")]
fn test_to_string() {
let node = Node::new("lo");
assert_eq!(node.to_string(), "00:00:00:00:00:00");
}
}