63 lines
1.6 KiB
Go
63 lines
1.6 KiB
Go
// Copyright 2018 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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package osp
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// TODO(jophba):
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// - Make our own abstraction that has
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// .InstanceName, .HostName, .MetadataVersion, .FingerPrint
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// rather than using mdns.ServiceEntry
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// - Advertise TXT (text below) with "fp" and "mv"
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import (
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"context"
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mdns "github.com/grandcat/zeroconf"
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)
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const (
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MdnsServiceType = "_openscreen._udp"
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MdnsDomain = "local"
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)
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// Returns a channel of mDNS entries. The critical parts are
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// entry.Target (service name) entry.HostName, entry.AddrIPv4, and
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// entry.AddrIPv6.
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func BrowseMdns(ctx context.Context) (<-chan *mdns.ServiceEntry, error) {
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entries := make(chan *mdns.ServiceEntry)
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resolver, err := mdns.NewResolver(nil)
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if err != nil {
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return entries, err
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}
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err = resolver.Browse(ctx, MdnsServiceType, MdnsDomain, entries)
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return entries, err
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}
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// Returns a channel of mDNS entries. The critical parts are,
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// entry.HostName, entry.AddrIPv4, and entry.AddrIPv6.
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func LookupMdns(ctx context.Context, target string) (<-chan *mdns.ServiceEntry, error) {
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entries := make(chan *mdns.ServiceEntry)
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resolver, err := mdns.NewResolver(nil)
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if err != nil {
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return entries, err
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}
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err = resolver.Lookup(ctx, target, MdnsServiceType, MdnsDomain, entries)
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return entries, err
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}
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func RunMdnsServer(ctx context.Context, instance string, port int) error {
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var text []string
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server, err := mdns.Register(instance, MdnsServiceType, MdnsDomain, port, text, nil /* ifaces */)
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if err != nil {
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return err
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}
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waitUntilDone(ctx)
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server.Shutdown()
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return nil
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}
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