eduard256
ccb100fcd0
Detect stock Xiaomi/Mijia devices via miIO hello packet on UDP:54321. Response magic 0x2131 uniquely identifies miIO devices. Detector priority: ONVIF > HomeKit > Xiaomi > standard.
61 lines
1.5 KiB
Go
61 lines
1.5 KiB
Go
package probe
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import (
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"context"
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"encoding/binary"
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"net"
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"time"
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)
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// miIO hello packet -- 32 bytes. Stock Xiaomi/Mijia devices listen on
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// UDP:54321 and reply with the same magic 0x2131 + their device_id + stamp.
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// Newer firmwares always return 0xFF in the token field, regardless of
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// pairing status -- real token is only available via Mi Cloud API.
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var xiaomiHello = []byte{
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0x21, 0x31, 0x00, 0x20,
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0xff, 0xff, 0xff, 0xff,
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0xff, 0xff, 0xff, 0xff,
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0xff, 0xff, 0xff, 0xff,
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0xff, 0xff, 0xff, 0xff,
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0xff, 0xff, 0xff, 0xff,
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0xff, 0xff, 0xff, 0xff,
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0xff, 0xff, 0xff, 0xff,
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}
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// ProbeXiaomi sends miIO hello to ip:54321 and checks the reply magic.
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// Returns nil, nil if the device is not a Xiaomi miIO device.
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func ProbeXiaomi(ctx context.Context, ip string) (*XiaomiResult, error) {
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conn, err := net.ListenPacket("udp4", ":0")
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if err != nil {
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return nil, err
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}
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defer conn.Close()
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deadline, ok := ctx.Deadline()
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if !ok {
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deadline = time.Now().Add(100 * time.Millisecond)
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}
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_ = conn.SetDeadline(deadline)
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addr := &net.UDPAddr{IP: net.ParseIP(ip), Port: 54321}
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if _, err = conn.WriteTo(xiaomiHello, addr); err != nil {
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return nil, err
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}
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buf := make([]byte, 64)
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n, _, err := conn.ReadFrom(buf)
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if err != nil || n < 32 {
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return nil, nil
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}
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// magic must be 0x2131 -- unique miIO header
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if buf[0] != 0x21 || buf[1] != 0x31 {
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return nil, nil
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}
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return &XiaomiResult{
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DeviceID: binary.BigEndian.Uint32(buf[8:12]),
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Stamp: binary.BigEndian.Uint32(buf[12:16]),
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}, nil
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}
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