private Streamhost NegotiateProxy(SISession session, IEnumerable <Streamhost> proxies)
{
XmlElement e = Xml.Element("query", "http://jabber.org/protocol/bytestreams").Attr("sid", session.Sid);
foreach (Streamhost streamhost in proxies)
{
e.Child(Xml.Element("streamhost", null).Attr("jid", streamhost.Jid.ToString()).Attr("host", streamhost.Host).Attr("port", streamhost.Port.ToString()));
}
Iq errorIq = base.im.IqRequest(IqType.Set, session.To, base.im.Jid, e, null, -1, "");
if (errorIq.Type == IqType.Error)
{
throw Util.ExceptionFromError(errorIq, "The SOCKS5 negotiation failed.");
}
XmlElement element2 = errorIq.Data["query"];
if ((element2 == null) || (element2.NamespaceURI != "http://jabber.org/protocol/bytestreams"))
{
throw new XmppException("Erroneous response.");
}
XmlElement element3 = element2["streamhost-used"];
if (element3 == null)
{
throw new XmppException("Missing streamhost-used element.");
}
string proxyJid = element3.GetAttribute("jid");
Streamhost streamhost2 = proxies.FirstOrDefault <Streamhost>(proxy => proxy.Jid == proxyJid);
if (streamhost2 == null)
{
throw new XmppException("Invalid streamhost JID.");
}
return(streamhost2);
}
private IEnumerable <Streamhost> GetProxyList()
{
ISet <Streamhost> set = new HashSet <Streamhost>();
foreach (S22.Xmpp.Extensions.Item item in this.sdisco.GetItems(base.im.Jid.Domain))
{
foreach (Identity identity in this.sdisco.GetIdentities(item.Jid))
{
if ((identity.Category == "proxy") && (identity.Type == "bytestreams"))
{
Streamhost networkAddress = this.GetNetworkAddress(item.Jid);
set.Add(networkAddress);
}
}
}
return(set);
}
private void MediatedTransfer(SISession session, IEnumerable <Streamhost> proxies)
{
Streamhost streamhost = this.NegotiateProxy(session, proxies);
using (Socks5Client client = new Socks5Client(streamhost.Host, streamhost.Port, null, null))
{
string domain = this.Sha1(session.Sid + session.From + session.To);
if (client.Request(SocksCommand.Connect, domain, 0).Status != ReplyStatus.Succeeded)
{
CommonConfig.Logger.WriteInfo("SOCKS5 Connect request failed.");
throw new Socks5Exception("SOCKS5 Connect request failed.");
}
CommonConfig.Logger.WriteInfo("SOCKS5 Connect successed.");
XmlElement data = Xml.Element("query", "http://jabber.org/protocol/bytestreams").Attr("sid", session.Sid).Child(Xml.Element("activate", null).Text(session.To.ToString()));
Iq errorIq = base.im.IqRequest(IqType.Set, streamhost.Jid, base.im.Jid, data, null, -1, "");
if (errorIq.Type == IqType.Error)
{
throw Util.ExceptionFromError(errorIq, "Could not activate the bytestream.");
}
this.SendData(session, client.GetStream());
}
}
