Release v0.6.58: preserve LAN connections across missed discovery

tests/lan_input.cpp

@@ -317,6 +317,11 @@ void hubChecks()
     auto deadline=GetTickCount64()+5000;
     while((hubs[0]->ready().size()!=2||hubs[1]->ready().size()!=2||hubs[2]->ready().size()!=2)&&GetTickCount64()<deadline)pump();
     check(hubs[0]->ready().size()==2&&hubs[1]->ready().size()==2&&hubs[2]->ready().size()==2,"three TCP hubs authenticate all independent pair channels on one listener per PC");
+    auto generation=hubs[0]->ready();
+    for(auto &list:endpoints)for(auto &e:list)e.address=0;
+    for(int n=0;n<20;++n)pump();
+    check(hubs[0]->ready()==generation&&hubs[1]->ready().size()==2&&hubs[2]->ready().size()==2,"expired discovery does not destroy authenticated channels");
+    for(auto &list:endpoints)for(auto &e:list)e.address=htonl(INADDR_LOOPBACK);
     InputFrame keyFrame{InputType::Key,7,'A',0,1},cross{InputType::Cross,8,2,30000};
     hubs[0]->poll(endpoints[0],{{ids[1],keyFrame},{ids[2],cross}},incoming[0],GetTickCount64());
     for(int n=0;n<100&&(incoming[1].empty()||incoming[2].empty());++n)pump();
@@ -327,6 +332,15 @@ void hubChecks()
     check(hubs[0]->ready().contains(ids[2])&&hubs[0]->ready().at(ids[2])==survivor,"one computer disconnect leaves other authenticated channel intact");
     for(int n=0;n<300&&(hubs[0]->ready().size()!=2||hubs[1]->ready().size()!=2);++n)pump(1800);
     check(hubs[0]->ready().size()==2&&hubs[0]->ready().at(ids[1])!=old,"mesh reconnect restores channel with fresh ownership generation");
+    {
+        auto serverPort=freePort();InputHub server(ids[2],serverPort),client(ids[0],freePort());
+        std::vector<InputEndpoint> unknown{{ids[0],secret,0}},known{{ids[2],secret,htonl(INADDR_LOOPBACK),serverPort}};
+        std::vector<RoutedInput> a,b;
+        for(int n=0;n<300&&(server.ready().empty()||client.ready().empty());++n){
+            server.poll(unknown,{},a,GetTickCount64());client.poll(known,{},b,GetTickCount64());Sleep(1);
+        }
+        check(server.ready().size()==1&&client.ready().size()==1,"saved pair listens and authenticates without receiving a discovery announcement");
+    }
     endpoints[0].erase(endpoints[0].begin());hubs[0]->poll(endpoints[0],{},incoming[0],GetTickCount64()+1800);
     check(!hubs[0]->ready().contains(ids[1])&&hubs[0]->ready().contains(ids[2]),"forgetting one pair revokes only its channel");
 }