No results (Windows)

[jmarkel44]

Seems to work fine on a Pi. Here's the same code running under Windows:

c:\repo\src>go run mdns.go
2020/03/31 16:21:23 [ERR] mdns: Failed to bind to udp6 port: listen udp6 [ff02::fb]:5353: setsockopt: not supported by windows
2020/03/31 16:21:24 [ERR] mdns: Failed to read packet: read udp4 0.0.0.0:52447: use of closed network connection

[jmarkel44]

With some debug info enabled and Wireshark running, it looks like the query packet is never sent:

c:\repo\src>go run mdns.go
searching for new entries
[DEBUG] starting the query
2020/04/01 07:19:41 [ERR] mdns: Failed to bind to udp6 port: listen udp6 [ff02::fb]:5353: setsockopt: not supported by windows
[DEBUG] service -> _workstation._tcp.local.
[DEBUG] Sending the question
[DEBUG] Sending the query <-- would've expected to see something in Wireshark here (mdns filtered)
[DEBUG] Write to ipv4 OK
[DEBUG] write to ipv6 OK
[DEBUG] params.Timeout = 1000000000
[DEBUG] time elapsed
[DEBUG] finished
2020/04/01 07:19:43 [INFO] mdns: Closing client {0xc000080020 0xc000080028 0xc000080030 <nil> 1 0xc00004a180}

[clowenhg]

It seems that on Windows we need to explicitly set params.Interface

Here's a quick snippet of code that makes my queries work on Windows.
Note: my LAN network adapter is "Ethernet 7"

I'm not sure the best way to find the right interface without knowing the name ahead of time yet.

	ifaces, _ := net.Interfaces()
	var iface net.Interface
	for _, i := range ifaces {
		fmt.Println(i.Name)
		if strings.Contains(i.Name, "Ethernet 7") {
			iface = i
			addrs, _ := i.Addrs()
			for _, a := range addrs {
				fmt.Println(a)
			}
		}
	}
	entries := make(chan *mdns.ServiceEntry, 1)
	defer close(entries)

	params := mdns.DefaultParams("_cal._tcp")
	params.Timeout = 2 * time.Second
	params.Entries = entries
	params.DisableIPv6 = true
	params.Interface = &iface