The ability to flood and even crash clients have been there for a very long time, because the client itself does not implement any kind of flood protection, except the search flood. I guess that clients mostly rely on hub antiflood protection, but in this case it is a hub itself that enforces the flood.
I have written antiflood Lua script in 2014 for ApexDC++ that I used to run, it requires Scripts plugin, and works well on any client that supports latest Scripts plugin, inclusive DC++: https://ledo.feardc.net/dcpp/antiflood.lua -- You received this bug notification because you are a member of Dcplusplus-team, which is subscribed to DC++. https://bugs.launchpad.net/bugs/2019497 Title: Handling of CTM/search DDoS triggered by a malicious hub Status in AirDC++: Fix Released Status in DC++: Confirmed Bug description: I've received a few weird crash reports that are both linked to a specific hub (favorite-hub.net): https://github.com/airdcpp-web/airdcpp-webclient/issues/450 https://github.com/airdcpp/airdcpp-windows/issues/63 While inspecting the issue more closely, I noticed that the client receives about 300 search/CTM requests per second from the hub, similar to these: $Search 82.146.38.183:80 F?F?0?1?t $ConnectToMe maksis 82.146.38.183:443 $Search 82.146.38.183:443 F?F?0?1?p $ConnectToMe maksis 82.146.38.183:80 $Search 82.146.38.183:80 F?F?0?1?t $ConnectToMe maksis 82.146.38.183:443 $Search 82.146.38.183:443 F?F?0?1?p $ConnectToMe maksis 82.146.38.183:80 $Search 82.146.38.183:80 F?F?0?1?t $ConnectToMe maksis 82.146.38.183:443 Looks like this has been going on for years already and the client is unable to even report it in a meaningful way. DC++ shows a few status messages about search spam but that doesn't really reveal the full extent of the problem as the aim of the hub is clearly to consume all possible system resources from its users. To manage notifications about this bug go to: https://bugs.launchpad.net/airdcpp/+bug/2019497/+subscriptions _______________________________________________ Mailing list: https://launchpad.net/~linuxdcpp-team Post to : linuxdcpp-team@lists.launchpad.net Unsubscribe : https://launchpad.net/~linuxdcpp-team More help : https://help.launchpad.net/ListHelp
