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use std::error::Error;
use std::net::{SocketAddr, ToSocketAddrs, UdpSocket};
use std::{fmt, iter};
use arrayvec::ArrayVec;
const MAC_SIZE: usize = 6;
const MAC_PER_MAGIC: usize = 16;
const HEADER: [u8; 6] = [0xFF; 6];
const PACKET_LEN: usize = HEADER.len() + MAC_SIZE * MAC_PER_MAGIC;
type Packet = ArrayVec<u8, PACKET_LEN>;
type Mac = ArrayVec<u8, MAC_SIZE>;
pub type Result<T> = std::result::Result<T, WakeyError>;
#[derive(Debug)]
pub enum WakeyError {
InvalidMacLength,
InvalidMacFormat,
SendFailure(std::io::Error),
}
impl Error for WakeyError {}
impl fmt::Display for WakeyError {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
match self {
WakeyError::InvalidMacLength => {
write!(f, "Invalid MAC address length")
}
WakeyError::InvalidMacFormat => write!(f, "Invalid MAC address format"),
WakeyError::SendFailure(e) => write!(f, "Couldn't send WoL packet: {e}"),
}
}
}
impl From<std::io::Error> for WakeyError {
fn from(error: std::io::Error) -> Self {
WakeyError::SendFailure(error)
}
}
#[derive(Debug, Clone, PartialEq, Eq)]
pub struct WolPacket {
packet: Packet,
}
impl WolPacket {
pub fn from_bytes(mac: &[u8]) -> Result<WolPacket> {
Ok(WolPacket {
packet: WolPacket::create_packet_bytes(mac)?,
})
}
pub fn from_string<T: AsRef<str>>(data: T, sep: char) -> Result<WolPacket> {
WolPacket::from_bytes(&WolPacket::mac_to_byte(data, sep)?)
}
pub fn send_magic(&self) -> Result<()> {
self.send_magic_to(
SocketAddr::from(([0, 0, 0, 0], 0)),
SocketAddr::from(([255, 255, 255, 255], 9)),
)
}
pub fn send_magic_to<A: ToSocketAddrs>(&self, src: A, dst: A) -> Result<()> {
let udp_sock = UdpSocket::bind(src)?;
udp_sock.set_broadcast(true)?;
udp_sock.send_to(&self.packet, dst)?;
Ok(())
}
pub fn into_inner(self) -> Packet {
self.packet
}
fn mac_to_byte<T: AsRef<str>>(data: T, sep: char) -> Result<Mac> {
if data.as_ref().len() != MAC_SIZE * 3 - 1 {
return Err(WakeyError::InvalidMacLength);
}
let bytes = data
.as_ref()
.split(sep)
.map(|x| hex::decode(x).map_err(|_| WakeyError::InvalidMacFormat))
.collect::<Result<ArrayVec<_, MAC_SIZE>>>()?
.into_iter()
.flatten()
.collect::<Mac>();
debug_assert_eq!(MAC_SIZE, bytes.len());
Ok(bytes)
}
fn extend_mac(mac: &[u8]) -> ArrayVec<u8, { MAC_SIZE * MAC_PER_MAGIC }> {
let magic = iter::repeat(mac)
.take(MAC_PER_MAGIC)
.flatten()
.copied()
.collect::<ArrayVec<u8, { MAC_SIZE * MAC_PER_MAGIC }>>();
debug_assert_eq!(MAC_SIZE * MAC_PER_MAGIC, magic.len());
magic
}
fn create_packet_bytes(mac: &[u8]) -> Result<Packet> {
if mac.len() != MAC_SIZE {
return Err(WakeyError::InvalidMacLength);
}
let mut packet = Packet::new();
packet.extend(HEADER);
packet.extend(WolPacket::extend_mac(mac));
debug_assert_eq!(PACKET_LEN, packet.len());
Ok(packet)
}
}
#[cfg(test)]
mod tests {
use super::*;
#[test]
fn extend_mac_test() {
let mac = vec![0x01, 0x02, 0x03, 0x04, 0x05, 0x06];
let extended_mac = WolPacket::extend_mac(&mac);
assert_eq!(extended_mac.len(), MAC_PER_MAGIC * MAC_SIZE);
assert_eq!(&extended_mac[(MAC_PER_MAGIC - 1) * MAC_SIZE..], &mac[..]);
}
#[test]
#[should_panic]
fn extend_mac_mac_too_long_test() {
let mac = vec![0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07];
WolPacket::extend_mac(&mac);
}
#[test]
#[should_panic]
fn extend_mac_mac_too_short_test() {
let mac = vec![0x01, 0x02, 0x03, 0x04, 0x05];
WolPacket::extend_mac(&mac);
}
#[test]
fn mac_to_byte_test() {
let mac = "01:02:03:04:05:06";
let result = WolPacket::mac_to_byte(mac, ':');
assert_eq!(
result.unwrap().into_inner().unwrap(),
[0x01, 0x02, 0x03, 0x04, 0x05, 0x06]
);
}
#[test]
fn mac_to_byte_invalid_chars_test() {
let mac = "ZZ:02:03:04:05:06";
assert!(matches!(
WolPacket::mac_to_byte(mac, ':'),
Err(WakeyError::InvalidMacFormat)
));
}
#[test]
fn mac_to_byte_invalid_separator_test() {
let mac = "01002:03:04:05:06";
assert!(matches!(
WolPacket::mac_to_byte(mac, ':'),
Err(WakeyError::InvalidMacFormat)
));
}
#[test]
fn mac_to_byte_mac_too_long_test() {
let mac = "01:02:03:04:05:06:07";
assert!(matches!(
WolPacket::mac_to_byte(mac, ':'),
Err(WakeyError::InvalidMacLength)
));
}
#[test]
fn mac_to_byte_mac_too_short_test() {
let mac = "01:02:03:04:05";
assert!(matches!(
WolPacket::mac_to_byte(mac, ':'),
Err(WakeyError::InvalidMacLength)
));
}
#[test]
fn create_packet_bytes_test() {
let bytes = WolPacket::create_packet_bytes(&[0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF]).unwrap();
assert_eq!(bytes.len(), MAC_SIZE * MAC_PER_MAGIC + HEADER.len());
assert!(bytes.iter().all(|&x| x == 0xFF));
}
#[test]
fn create_wol_packet() {
let mac = vec![0x00, 0x01, 0x02, 0x03, 0x04, 0x05];
let wol = WolPacket::from_bytes(&mac).unwrap();
let packet = wol.into_inner();
assert_eq!(packet.len(), PACKET_LEN);
assert_eq!(
[0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF],
&packet[0..HEADER.len()]
);
for offset in (HEADER.len()..PACKET_LEN).step_by(MAC_SIZE) {
assert_eq!(&mac, &packet[offset..offset + MAC_SIZE]);
}
}
}