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feat: refactor, add magicpacket validation and tests
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,51 @@ | ||
| package listen | ||
|
|
||
| import ( | ||
| "errors" | ||
| "fmt" | ||
| "syscall" | ||
|
|
||
| "github.com/jedrw/gowake/pkg/magicpacket" | ||
| "github.com/spf13/cobra" | ||
| ) | ||
|
|
||
| var port int | ||
| var ip string | ||
|
|
||
| var ListenCmd = &cobra.Command{ | ||
| Use: "listen", | ||
| Short: "Listen for a magic packet", | ||
| RunE: func(cmd *cobra.Command, args []string) error { | ||
| ip, _ := cmd.Flags().GetString("ip") | ||
| port, _ := cmd.Flags().GetInt("port") | ||
| cont, _ := cmd.Flags().GetBool("continuous") | ||
| fmt.Printf("Listening for magic packets on %s:%d\n", ip, port) | ||
| for { | ||
| remote, mac, err := magicpacket.Listen(ip, port) | ||
| if err != nil { | ||
| var errno syscall.Errno | ||
| if errors.As(err, &errno) { | ||
| if errno == syscall.EACCES { | ||
| return fmt.Errorf("%w: please run as elevated user", err) | ||
| } | ||
| } else { | ||
| return err | ||
| } | ||
| } | ||
|
|
||
| fmt.Printf("%s from %s\n", mac, remote.String()) | ||
| if !cont { | ||
| break | ||
| } | ||
| } | ||
|
|
||
| return nil | ||
| }, | ||
| } | ||
|
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| func init() { | ||
| var continuous bool | ||
| ListenCmd.Flags().IntVarP(&port, "port", "p", 9, "Port to listen for magic packets on") | ||
| ListenCmd.Flags().StringVarP(&ip, "ip", "i", "0.0.0.0", "Address to listen for magic packets on") | ||
| ListenCmd.Flags().BoolVarP(&continuous, "continuous", "c", false, "Listen continuously for magic packets") | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1,31 +1,62 @@ | ||
| package magicpacket | ||
|
|
||
| import ( | ||
| "bytes" | ||
| "errors" | ||
| "fmt" | ||
| "net" | ||
| ) | ||
|
|
||
| var ( | ||
| ErrNotValidEUI48MacAddress = errors.New("not a valid EUI-48 MAC address") | ||
| ErrMalformedMagicPacket = errors.New("malformed magic packet") | ||
| ) | ||
|
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| type MagicPacket [102]byte | ||
|
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| func New(mac string) (MagicPacket, error) { | ||
| // Parse mac address | ||
| hwAddr, err := net.ParseMAC(mac) | ||
| if err != nil { | ||
| return MagicPacket{}, err | ||
| } | ||
|
|
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| if len(hwAddr) != 6 { | ||
| return MagicPacket{}, fmt.Errorf("invalid EUI-48 MAC address") | ||
| return MagicPacket{}, fmt.Errorf("%w, %s", ErrNotValidEUI48MacAddress, hwAddr) | ||
| } | ||
|
|
||
| // Build magicpacket | ||
| magicPacket := MagicPacket{255, 255, 255, 255, 255, 255} | ||
|
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| offset := 6 | ||
| for i := 0; i < 16; i++ { | ||
| copy(magicPacket[offset:], hwAddr[:]) | ||
| offset += 6 | ||
| } | ||
|
|
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| return magicPacket, err | ||
| return magicPacket, nil | ||
| } | ||
|
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| func (mp MagicPacket) Bytes() []byte { | ||
| return mp[:] | ||
| } | ||
|
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| func (mp MagicPacket) Mac() string { | ||
| return net.HardwareAddr.String(mp[96:]) | ||
| } | ||
|
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| func (mp MagicPacket) Validate() error { | ||
| macLength := 6 | ||
| offset := 6 | ||
| for i := 0; i < 16; i++ { | ||
| if !bytes.Equal(mp[offset:offset+macLength], mp[96:]) { | ||
| return ErrMalformedMagicPacket | ||
| } | ||
|
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| offset += 6 | ||
| } | ||
|
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| _, err := net.ParseMAC(mp.Mac()) | ||
| if err != nil { | ||
| return err | ||
| } | ||
|
|
||
| return nil | ||
| } |
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