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wgengine/magicsock: fix bug in peerMap.upsertEndpoint
Found by inspection. Contains before/after for easy toggling.
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@ -167,17 +167,26 @@ func (m *peerMap) forEachEndpointWithDiscoKey(dk tailcfg.DiscoKey, f func(ep *en
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// upsertEndpoint stores endpoint in the peerInfo for
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// ep.publicKey, and updates indexes. m must already have a
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// tailcfg.Node for ep.publicKey.
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func (m *peerMap) upsertEndpoint(ep *endpoint) {
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func (m *peerMap) upsertEndpoint(ep *endpoint, oldDiscoKey tailcfg.DiscoKey) {
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pi := m.byNodeKey[ep.publicKey]
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if pi == nil {
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pi = newPeerInfo(ep)
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m.byNodeKey[ep.publicKey] = pi
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} else {
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const useBuggyVersion = true
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if useBuggyVersion {
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// buggy version
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old := pi.ep
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pi.ep = ep
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if old.discoKey != ep.discoKey {
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delete(m.nodesOfDisco[old.discoKey], ep.publicKey)
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}
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} else {
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// fixed version
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if oldDiscoKey != ep.discoKey {
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delete(m.nodesOfDisco[oldDiscoKey], ep.publicKey)
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}
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}
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}
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if !ep.discoKey.IsZero() {
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set := m.nodesOfDisco[ep.discoKey]
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@ -2237,8 +2246,9 @@ func (c *Conn) SetNetworkMap(nm *netmap.NetworkMap) {
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// handle full set updates.
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for _, n := range nm.Peers {
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if ep, ok := c.peerMap.endpointForNodeKey(n.Key); ok {
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oldDiscoKey := ep.discoKey
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ep.updateFromNode(n)
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c.peerMap.upsertEndpoint(ep) // maybe update discokey mappings in peerMap
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c.peerMap.upsertEndpoint(ep, oldDiscoKey) // maybe update discokey mappings in peerMap
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continue
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}
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@ -2278,7 +2288,7 @@ func (c *Conn) SetNetworkMap(nm *netmap.NetworkMap) {
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}
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}))
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ep.updateFromNode(n)
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c.peerMap.upsertEndpoint(ep)
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c.peerMap.upsertEndpoint(ep, tailcfg.DiscoKey{})
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}
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// If the set of nodes changed since the last SetNetworkMap, the
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@ -1148,7 +1148,7 @@ func TestDiscoMessage(t *testing.T) {
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c.peerMap.upsertEndpoint(&endpoint{
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publicKey: n.Key,
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discoKey: n.DiscoKey,
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})
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}, tailcfg.DiscoKey{})
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const payload = "why hello"
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