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| | // Copyright 2018 Amazon.com, Inc. or its affiliates. All Rights Reserved.
// SPDX-License-Identifier: Apache-2.0
//
// Portions Copyright 2017 The Chromium OS Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the THIRD-PARTY file.
// use rand::Rng;
use std::result::Result;
// use serde::de::{Deserialize, Deserializer, Error};
// use serde::ser::{Serialize, Serializer};
pub const MAC_ADDR_LEN: usize = 6;
#[derive(Clone, Copy, Debug, PartialEq)]
pub struct MacAddr {
bytes: [u8; MAC_ADDR_LEN],
}
impl MacAddr {
// The error contains the str that failed to be parsed, for nicer error message generation.
pub fn parse_str<S>(s: &S) -> Result<MacAddr, &str>
where
S: AsRef<str> + ?Sized,
{
let v: Vec<&str> = s.as_ref().split(':').collect();
let mut bytes = [0u8; MAC_ADDR_LEN];
if v.len() != MAC_ADDR_LEN {
return Err(s.as_ref());
}
for i in 0..MAC_ADDR_LEN {
if v[i].len() != 2 {
return Err(s.as_ref());
}
bytes[i] = u8::from_str_radix(v[i], 16).map_err(|_| s.as_ref())?;
}
Ok(MacAddr { bytes })
}
// Does not check whether src.len() == MAC_ADDR_LEN.
#[inline]
pub fn from_bytes_unchecked(src: &[u8]) -> MacAddr {
// TODO: using something like std::mem::uninitialized could avoid the extra initialization,
// if this ever becomes a performance bottleneck.
let mut bytes = [0u8; MAC_ADDR_LEN];
bytes[..].copy_from_slice(&src[..]);
MacAddr { bytes }
}
// An error can only occur if the slice length is different from MAC_ADDR_LEN.
#[inline]
pub fn from_bytes(src: &[u8]) -> Result<MacAddr, ()> {
if src.len() != MAC_ADDR_LEN {
return Err(());
}
Ok(MacAddr::from_bytes_unchecked(src))
}
#[inline]
pub fn get_bytes(&self) -> &[u8] {
&self.bytes
}
pub fn to_string(self) -> String {
let b = &self.bytes;
format!(
"{:02x}:{:02x}:{:02x}:{:02x}:{:02x}:{:02x}",
b[0], b[1], b[2], b[3], b[4], b[5]
)
}
// pub fn local_random() -> MacAddr {
// // Generate a fully random MAC
// let mut random_bytes = rand::thread_rng().gen::<[u8; MAC_ADDR_LEN]>();
// // Set the first byte to make the OUI a locally administered OUI
// random_bytes[0] = 0x2e;
// MacAddr {
// bytes: random_bytes,
// }
// }
}
// impl Serialize for MacAddr {
// fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
// where
// S: Serializer,
// {
// self.to_string().serialize(serializer)
// }
// }
// impl<'de> Deserialize<'de> for MacAddr {
// fn deserialize<D>(deserializer: D) -> Result<MacAddr, D::Error>
// where
// D: Deserializer<'de>,
// {
// let s = String::deserialize(deserializer)?;
// MacAddr::parse_str(&s).map_err(|_| D::Error::custom("The provided MAC address is invalid."))
// }
// }
#[cfg(test)]
mod tests {
// extern crate serde_json;
use super::*;
#[test]
fn test_mac_addr() {
// too long
assert!(MacAddr::parse_str("aa:aa:aa:aa:aa:aa:aa").is_err());
// invalid hex
assert!(MacAddr::parse_str("aa:aa:aa:aa:aa:ax").is_err());
// single digit mac address component should be invalid
assert!(MacAddr::parse_str("aa:aa:aa:aa:aa:b").is_err());
// components with more than two digits should also be invalid
assert!(MacAddr::parse_str("aa:aa:aa:aa:aa:bbb").is_err());
let mac = MacAddr::parse_str("12:34:56:78:9a:BC").unwrap();
println!("parsed MAC address: {}", mac.to_string());
let bytes = mac.get_bytes();
assert_eq!(bytes, [0x12u8, 0x34, 0x56, 0x78, 0x9a, 0xbc]);
}
#[test]
fn test_from_bytes() {
let src1 = [0x01, 0x02, 0x03, 0x04, 0x05];
let src2 = [0x01, 0x02, 0x03, 0x04, 0x05, 0x06];
let src3 = [0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07];
assert!(MacAddr::from_bytes(&src1[..]).is_err());
let x = MacAddr::from_bytes(&src2[..]).unwrap();
assert_eq!(x.to_string(), String::from("01:02:03:04:05:06"));
assert!(MacAddr::from_bytes(&src3[..]).is_err());
}
// #[test]
// fn test_mac_addr_serialization_and_deserialization() {
// let mac: MacAddr =
// serde_json::from_str("\"12:34:56:78:9a:bc\"").expect("MacAddr deserialization failed.");
// let bytes = mac.get_bytes();
// assert_eq!(bytes, [0x12u8, 0x34, 0x56, 0x78, 0x9a, 0xbc]);
// let s = serde_json::to_string(&mac).expect("MacAddr serialization failed.");
// assert_eq!(s, "\"12:34:56:78:9a:bc\"");
// }
}
|