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feat(network): build WoL magic packet
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README.md
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README.md
···
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- [NixOS netboot with pixiecore](https://nixos.wiki/wiki/Netboot)
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- [The Pixiecore library](https://github.com/danderson/netboot/tree/main/pixiecore)
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- Custom agent for the installation process inspired by [OpenStack ironic-python-agent](https://opendev.org/openstack/ironic-python-agent) and [Tinkerbell Worker](https://tinkerbell.org/docs/services/tink-worker)
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- Wireshark's [WakeOnLAN wiki page](https://wiki.wireshark.org/WakeOnLAN)
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- AMD's [Magic Packet Technology](https://www.amd.com/content/dam/amd/en/documents/archived-tech-docs/white-papers/20213.pdf) white paper
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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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func buildMacicPacket(mac net.HardwareAddr) []byte {
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// A physical WakeOnLAN (Magic Packet) will look like this:
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//
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// | Synchronization Stream | Target MAC | Password (optional) |
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// | 6 | 96 | 0, 4 or 6 |
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//
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// See also https://wiki.wireshark.org/WakeOnLAN
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packet := make([]byte, 0)
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const (
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// The synchronization stream is defined as 6 bytes of FFh
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syncStreamLength = 6
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// The Target MAC block contains 16 duplications of the IEEE address of the target
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macRepeat = 16
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// We don't support passwords, at least not yet
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)
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for range syncStreamLength {
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packet = append(packet, 0xFF)
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}
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for range macRepeat {
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packet = append(packet, mac...)
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}
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return packet
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}
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internal/network/wol_test.go
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internal/network/wol_test.go
···
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package network
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import (
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"bytes"
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"net"
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"testing"
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)
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func TestBuildMagicPacket(t *testing.T) {
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in := net.HardwareAddr{
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// bc:24:11:d0:28:34
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0xBC, 0x24, 0x11, 0xd0, 0x28, 0x34,
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}
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want := []byte{
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0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
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0xBC, 0x24, 0x11, 0xd0, 0x28, 0x34,
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0xBC, 0x24, 0x11, 0xd0, 0x28, 0x34,
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0xBC, 0x24, 0x11, 0xd0, 0x28, 0x34,
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0xBC, 0x24, 0x11, 0xd0, 0x28, 0x34,
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0xBC, 0x24, 0x11, 0xd0, 0x28, 0x34,
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0xBC, 0x24, 0x11, 0xd0, 0x28, 0x34,
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0xBC, 0x24, 0x11, 0xd0, 0x28, 0x34,
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0xBC, 0x24, 0x11, 0xd0, 0x28, 0x34,
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0xBC, 0x24, 0x11, 0xd0, 0x28, 0x34,
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0xBC, 0x24, 0x11, 0xd0, 0x28, 0x34,
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0xBC, 0x24, 0x11, 0xd0, 0x28, 0x34,
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0xBC, 0x24, 0x11, 0xd0, 0x28, 0x34,
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0xBC, 0x24, 0x11, 0xd0, 0x28, 0x34,
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0xBC, 0x24, 0x11, 0xd0, 0x28, 0x34,
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0xBC, 0x24, 0x11, 0xd0, 0x28, 0x34,
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0xBC, 0x24, 0x11, 0xd0, 0x28, 0x34,
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}
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got := buildMacicPacket(in)
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if !bytes.Equal(got, want) {
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t.Errorf("buildMagicPacket(%v) = %v; want %v", in, got, want)
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}
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}