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// Package wakeonlan implements Wake-On-Lan.
package wakeonlan
import (
"bytes"
"encoding/binary"
"fmt"
"net"
)
var (
header = []byte{0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF}
broadcastAddr = &net.UDPAddr{
IP: net.IPv4bcast,
Port: 9,
}
)
// Wake sends the Magic Packet to wake the computer with the given MAC address.
func Wake(mac net.HardwareAddr) error {
conn, err := net.DialUDP("udp", nil, broadcastAddr)
if err != nil {
return fmt.Errorf("could not create UDP broadcast: %w", err)
}
defer conn.Close()
payload := packet(mac)
if _, err := conn.Write(payload); err != nil {
return fmt.Errorf("could not send Magic Packet: %w", err)
}
return nil
}
func packet(mac net.HardwareAddr) []byte {
var buf bytes.Buffer
binary.Write(&buf, binary.BigEndian, header)
for i := 0; i < 16; i++ {
binary.Write(&buf, binary.BigEndian, mac)
}
return buf.Bytes()
}
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