57 lines
1.2 KiB
Go
57 lines
1.2 KiB
Go
package libipcamera
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import (
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"fmt"
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"log"
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"net"
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"time"
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)
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// Ports to try discovery on
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var targetPorts = []int{22600, 21600}
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// AutodiscoverCamera will try to find a camera using UDP Broadcasts
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func AutodiscoverCamera(verbose bool) (net.IP, error) {
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conn, err := net.ListenPacket("udp", ":22601")
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conn.SetReadDeadline(time.Now().Add(5 * time.Second))
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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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for _, port := range targetPorts {
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go sendDiscoveryBroadcasts(conn, port, 5, verbose)
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}
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buffer := make([]byte, 80)
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_, remoteAddr, err := conn.ReadFrom(buffer)
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if err != nil {
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return nil, err
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}
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udpAddr := remoteAddr.(*net.UDPAddr)
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return udpAddr.IP, nil
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}
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func sendDiscoveryBroadcasts(localConn net.PacketConn, port, count int, verbose bool) {
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broadcastAddress, err := net.ResolveUDPAddr("udp", fmt.Sprintf("255.255.255.255:%d", port))
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if err != nil {
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return
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}
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broadcastPacket := CreateCommandPacket(0x0114)
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if verbose {
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log.Printf("Trying Autodiscovery using UDP Port %d\n", port)
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}
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for i := 0; i < count; i++ {
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_, err = localConn.WriteTo(broadcastPacket, broadcastAddress)
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if err != nil {
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return
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}
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time.Sleep(time.Millisecond * 500)
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}
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}
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