DiscoverItems discoverItems = serviceDiscoveryManager.discoverItems(this.connection.getServiceName());
Iterator<Item> itemIterator = discoverItems.getItems();
// query all items if they are SOCKS5 proxies
while (itemIterator.hasNext()) {
Item item = itemIterator.next();
// skip blacklisted servers
if (this.proxyBlacklist.contains(item.getEntityID())) {
continue;
}
try {
DiscoverInfo proxyInfo;
proxyInfo = serviceDiscoveryManager.discoverInfo(item.getEntityID());
Iterator<Identity> identities = proxyInfo.getIdentities();
// item must have category "proxy" and type "bytestream"
while (identities.hasNext()) {
Identity identity = identities.next();
if ("proxy".equalsIgnoreCase(identity.getCategory())
&& "bytestreams".equalsIgnoreCase(identity.getType())) {
proxies.add(item.getEntityID());
break;
}
/*
* server is not a SOCKS5 proxy, blacklist server to skip next time a Socks5
* bytestream should be established
*/
this.proxyBlacklist.add(item.getEntityID());
}
}
catch (XMPPException e) {
// blacklist errornous server
this.proxyBlacklist.add(item.getEntityID());
}
}
return proxies;
}