88 lines
1.7 KiB
Go
88 lines
1.7 KiB
Go
package tendrils
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import (
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"context"
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"log"
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"net"
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"time"
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)
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func (t *Tendrils) listenDante(ctx context.Context, iface net.Interface) {
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go t.listenPTP(ctx, iface)
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}
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func (t *Tendrils) listenPTP(ctx context.Context, iface net.Interface) {
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addr, err := net.ResolveUDPAddr("udp4", "224.0.1.129:319")
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if err != nil {
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return
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}
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conn, err := net.ListenMulticastUDP("udp4", &iface, addr)
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if err != nil {
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if t.DebugDante {
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log.Printf("[dante] %s: failed to listen ptp: %v", iface.Name, err)
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}
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return
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}
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defer conn.Close()
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buf := make([]byte, 1500)
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for {
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select {
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case <-ctx.Done():
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return
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default:
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}
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conn.SetReadDeadline(time.Now().Add(1 * time.Second))
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n, src, err := conn.ReadFromUDP(buf)
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if err != nil {
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if netErr, ok := err.(net.Error); ok && netErr.Timeout() {
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continue
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}
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continue
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}
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t.handlePTPPacket(iface.Name, src.IP, buf[:n])
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}
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}
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func (t *Tendrils) handlePTPPacket(ifaceName string, srcIP net.IP, data []byte) {
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if len(data) < 34 {
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return
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}
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messageType := data[0] & 0x0f
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if messageType != 0x0b {
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return
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}
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if len(data) < 64 {
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return
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}
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clockClass := data[48]
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clockAccuracy := data[49]
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priority1 := data[47]
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priority2 := data[51]
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if t.DebugDante {
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log.Printf("[dante] %s: ptp announce from %s class=%d accuracy=%d p1=%d p2=%d",
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ifaceName, srcIP, clockClass, clockAccuracy, priority1, priority2)
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}
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t.nodes.SetDanteClockMaster(srcIP)
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}
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func (n *Nodes) UpdateDante(name string, ip net.IP, arcPort int) {
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if n.t.DebugDante {
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log.Printf("[dante] mdns response: %s -> %s (arc port %d)", name, ip, arcPort)
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}
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n.Update(nil, nil, []net.IP{ip}, "", name, "dante")
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if arcPort > 0 {
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go n.t.probeDanteDeviceWithPort(ip, arcPort)
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}
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}
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