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https://github.com/cwinfo/yggdrasil-go.git
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Handle cases where link-local addresses may disappear or change
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parent
cc0c188dc9
commit
5bacfabae7
@ -122,11 +122,48 @@ func (m *multicast) announce() {
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// There might be interfaces that we configured listeners for but are no
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// There might be interfaces that we configured listeners for but are no
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// longer up - if that's the case then we should stop the listeners
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// longer up - if that's the case then we should stop the listeners
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for name, listener := range m.listeners {
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for name, listener := range m.listeners {
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if _, ok := interfaces[name]; !ok {
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// Prepare our stop function!
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stop := func() {
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listener.stop <- true
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listener.stop <- true
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delete(m.listeners, name)
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delete(m.listeners, name)
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m.core.log.Debugln("No longer multicasting on", name)
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m.core.log.Debugln("No longer multicasting on", name)
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}
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}
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// If the interface is no longer visible on the system then stop the
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// listener, as another one will be started further down
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if _, ok := interfaces[name]; !ok {
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stop()
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continue
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}
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// It's possible that the link-local listener address has changed so if
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// that is the case then we should clean up the interface listener
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found := false
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listenaddr, err := net.ResolveTCPAddr("tcp6", listener.listener.Addr().String())
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if err != nil {
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stop()
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continue
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}
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// Find the interface that matches the listener
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if intf, err := net.InterfaceByName(name); err == nil {
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if addrs, err := intf.Addrs(); err == nil {
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// Loop through the addresses attached to that listener and see if any
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// of them match the current address of the listener
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for _, addr := range addrs {
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if ip, _, err := net.ParseCIDR(addr.String()); err == nil {
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// Does the interface address match our listener address?
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if ip.Equal(listenaddr.IP) {
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found = true
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break
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}
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}
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}
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}
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}
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// If the address has not been found on the adapter then we should stop
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// and clean up the TCP listener. A new one will be created below if a
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// suitable link-local address is found
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if !found {
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stop()
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}
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}
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}
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// Now that we have a list of valid interfaces from the operating system,
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// Now that we have a list of valid interfaces from the operating system,
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// we can start checking if we can send multicasts on them
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// we can start checking if we can send multicasts on them
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