string ClientManager::findHub(const string& ipPort) const {
    Lock l(cs);

    string url;
    for(auto c: clients) {
        auto ipPortPair = static_cast<NmdcHub*>(c)->parseIpPort(ipPort);
        if(c->getIp() == ipPortPair.first) {
            // If exact match is found, return it
            if(c->getPort() == ipPortPair.second)
                return c->getHubUrl();

            // Port is not always correct, so use this as a best guess...
            url = c->getHubUrl();
        }
    }

    return url;
}