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feat(network): add function to broadcast Wake-on-LAN magic packet
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internal/network/wol.go
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internal/network/wol.go
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package network
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import "net"
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import (
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"fmt"
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"net"
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)
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func buildMacicPacket(mac net.HardwareAddr) []byte {
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// A physical WakeOnLAN (Magic Packet) will look like this:
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return packet
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}
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func SendWakeOnLAN(mac net.HardwareAddr) error {
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// https://superuser.com/questions/295325/does-it-matter-what-udp-port-a-wol-signal-is-sent-to
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// UDP is recommended because it can be generated without raw sockets which come with security restrictions,
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// and port 9 is recommended because it maps to the old well-known discard protocol
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const wolPort = 9
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magicPacket := buildMacicPacket(mac)
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// TODO no IPv6 for now
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conn, err := net.DialUDP("udp4", nil, &net.UDPAddr{
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IP: net.IPv4bcast,
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Port: wolPort,
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})
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if err != nil {
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return fmt.Errorf("failed to dial UDP broadcast: %w", err)
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}
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defer conn.Close()
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if _, err = conn.Write(magicPacket); err != nil {
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return fmt.Errorf("failed to send magic packet: %w", err)
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}
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return nil
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}