/// <summary>
/// Scan the client machine for services such as HTTP or samba shares
/// </summary>
/// <param name="n"></param>
private void ScanClient(Node n)
{
//Check for HTTP
string webTitle = string.Empty;
try
{
var wc = new WebClient();
string html = wc.DownloadString("http://" + n.Host);
if (!string.IsNullOrEmpty(html))
{
webTitle = RegexEx.FindMatches("<title>.*</title>", html).FirstOrDefault();
if (null != webTitle && !string.IsNullOrEmpty(html) && webTitle.Length > 14)
{
webTitle = webTitle.Substring(7);
webTitle = webTitle.Substring(0, webTitle.Length - 8);
}
}
if (string.IsNullOrEmpty(webTitle))
webTitle = "Web";
}
catch
{
}
//Check for FTP
string ftp = string.Empty;
try
{
var client = new TcpClient();
client.Connect(n.Host, 21);
ftp = "FTP";
var sb = new StringBuilder();
long start = Environment.TickCount + 3000;
var data = new byte[20000];
client.ReceiveBufferSize = data.Length;
while (start > Environment.TickCount && client.Connected)
{
if (client.GetStream().DataAvailable)
{
int length = client.GetStream().Read(data, 0, data.Length);
sb.Append(Encoding.ASCII.GetString(data, 0, length));
}
else
{
Thread.Sleep(50);
}
}
client.Close();
string title = sb.ToString();
if (!string.IsNullOrEmpty(title))
ftp = title;
data = null;
}
catch
{
}
//Check for samba shares
string samba = string.Empty;
try
{
ShareCollection shares = ShareCollection.GetShares(n.Host);
var sb = new StringBuilder();
foreach (SambaShare share in shares)
{
if (share.IsFileSystem && share.ShareType == ShareType.Disk)
{
try
{
//Make sure its readable
DirectoryInfo[] Flds = share.Root.GetDirectories();
if (sb.Length > 0)
sb.Append("|");
sb.Append(share.NetName);
}
catch
{
}
}
}
samba = sb.ToString();
}
catch
{
}
lock (sync)
{
//update clients and overlords
var r = new Node();
r.SetData("HTTP", webTitle.Replace("\n", "").Replace("\r", ""));
r.SetData("FTP", ftp.Replace("\n", "").Replace("\r", ""));
r.SetData("Shares", samba.Replace("\n", "").Replace("\r", ""));
r.ID = n.ID;
r.OverlordID = serverNode.ID;
lock (sync)
{
//Check the client is still connected..
if (connectedClientNodes.Where(nx => nx.Node.ID == r.ID).Count() > 0)
{
var verb = new UpdateVerb();
verb.Nodes.Add(r);
NetworkRequest req = verb.CreateRequest();
req.OverlordID = serverNode.ID;
SendToStandardClients(req);
//Dont updates about overlords to other overlords
if (n.NodeType != ClientType.Overlord)
SendToOverlordClients(req);
}
}
//Store info
n.SetData("HTTP", webTitle.Replace("\n", "").Replace("\r", ""));
n.SetData("FTP", ftp.Replace("\n", "").Replace("\r", ""));
n.SetData("Shares", samba.Replace("\n", "").Replace("\r", ""));
}
}
private void c_OnDisconnect(ClientStream s)
{
try
{
lock (sync)
{
if (connectedClientNodes.Contains(s))
{
//Check it is actually the same node
// var search = connectedClientNodes.Where(n => n.Node.ID == s.Node.ID && s.Node.Secret == s.Node.Secret).FirstOrDefault();
// if (null == search)
{
logger.Debug("Server dropped client {0}", s.Node.ID);
connectedClientNodes.Remove(s);
s.OnDisconnect -= c_OnDisconnect;
var info = new UpdateVerb();
info.Nodes.Add(new Node {ID = s.Node.ID, Online = false});
NetworkRequest req = info.CreateRequest();
req.OverlordID = serverNode.ID;
req.SourceID = serverNode.ID;
SendToOverlordClients(req);
SendToStandardClients(req);
}
}
}
}
catch
{
}
}
/// <summary>
/// Handle updates from local clients, external overlords and peers on external overlords from their overlord.
/// </summary>
/// <param name="e"></param>
/// <param name="req"></param>
/// <returns></returns>
private bool HandleUpdate(RequestEventArgs e, NetworkRequest req)
{
try
{
var verb = new UpdateVerb();
verb.ProcessRequest(req);
//Ignore updates about ourself
if (verb.Nodes != null && verb.Nodes.Count == 1 && verb.Nodes[0].ID == serverNode.ID)
{
SendResponse(e, null);
return true;
}
//Is the call from a local client?
ClientStream localClient =
connectedClientNodes.ToList().Where(
n =>
n.Node.ID == req.SourceID && n.Node.Secret == req.AuthKey &&
n.Node.NodeType != ClientType.Overlord).FirstOrDefault();
if (null != localClient)
{
//Only allow updates about itself
Node client = verb.Nodes.Where(n => n.ID == localClient.Node.ID).FirstOrDefault();
if (null != client && verb.Nodes.Count == 1)
{
logger.Trace("Server got update from local client {0}", client.ID);
lock (sync)
{
//Copy to local store
foreach (var value in verb.Nodes[0].Data)
localClient.Node.SetData(value.Key, value.Value);
req.OverlordID = serverNode.ID;
//Retransmit
SendToOverlordClients(req);
SendToStandardClients(req);
//Has the client disconnected?
if (!localClient.Node.Online)
{
localClient.Kill();
connectedClientNodes.Remove(localClient);
}
}
SendResponse(e, null);
return true;
}
}
else
{
//Is the update from an external overlord?
Uplink overlord =
extOverlordServers.ToList().Where(
n =>
n.Destination.ID == req.OverlordID && n.Destination.Secret == req.AuthKey &&
n.Destination.NodeType == ClientType.Overlord).FirstOrDefault();
if (null != overlord)
{
logger.Trace("Server got update from external overlord {0}", overlord.Destination.ID);
//Check each update
var nverb = new UpdateVerb();
foreach (Node update in verb.Nodes)
{
if (!string.IsNullOrEmpty(update.ID))
{
//Ignore updates about ourself
if (update.ID == serverNode.ID)
continue;
lock (sync)
{
//Is the update about the overlord itself?
Uplink osearch =
extOverlordServers.Where(
o => o.Destination.ID == update.ID && o.Destination.Secret == req.AuthKey).
FirstOrDefault();
if (null != osearch)
{
logger.Trace("Server got update from external about itself: {0}",
osearch.Destination.ID);
//Copy to local store
foreach (var value in update.Data)
osearch.Destination.SetData(value.Key, value.Value);
//Retransmit changes
nverb.Nodes.Add(update);
//Overlord going offline
if (!osearch.Destination.Online)
{
osearch.OnDisconnect -= uplink_OnDisconnect;
osearch.Kill();
//Remove associated external nodes
foreach (Node enode in externalNodes.ToList())
{
if (enode.OverlordID == osearch.Destination.OverlordID)
{
externalNodes.Remove(enode);
//Only signal disconnect is the node isnt a local node
//I.e. they connected locally without disconnecting externally.
ClientStream search =
connectedClientNodes.Where(n => n.Node.ID == enode.ID).
FirstOrDefault();
if (null == search)
{
//The node isn't connected locally, is it connected elsewhere externally?
Node bestExternal =
externalNodes.ToList().Where(n => n.ID == enode.ID).
OrderByDescending(n => n.LastUpdate).FirstOrDefault();
if (null != bestExternal)
{
//User has logged on elsewhere, update local clients of new details
nverb.Nodes.Add(bestExternal);
}
else
{
nverb.Nodes.Add(new Node {ID = enode.ID, Online = false});
}
}
}
}
}
}
else
{
logger.Trace("Server got update from external server about : {0}", update.ID);
//Check to see if the external node is connected locally, if so then dont retransmit changes but store changes under the relevant object
ClientStream localNode =
connectedClientNodes.Where(n => n.Node.ID == update.ID).FirstOrDefault();
//Update about an external node from an external overlord
Node search =
externalNodes.Where(n => n.ID == update.ID && n.OverlordID == req.OverlordID)
.FirstOrDefault();
if (null == search)
{
if (!string.IsNullOrEmpty(update.ID))
{
//New external node
search = new Node();
//Copy to local store
foreach (var value in update.Data)
search.SetData(value.Key, value.Value);
search.OverlordID = req.OverlordID;
externalNodes.Add(search);
//Dont retransmit external node as it is local
if (null == localNode)
nverb.Nodes.Add(update);
}
}
else
{
//Copy to local store
foreach (var value in update.Data)
search.SetData(value.Key, value.Value);
//Has the external node changed to a different overlord?
if (search.OverlordID != req.OverlordID)
{
search.OverlordID = req.OverlordID;
update.OverlordID = req.OverlordID;
}
//Dont retransmit external node as it is local
if (null == localNode)
{
//Retransmit changes
nverb.Nodes.Add(update);
}
}
}
}
}
}
//Only transmit external node info to local clients
if (nverb.Nodes.Count > 0)
{
NetworkRequest nreq = nverb.CreateRequest();
nreq.OverlordID = req.OverlordID;
SendToStandardClients(nreq);
}
SendResponse(e, null);
return true;
}
}
}
catch
{
}
logger.Debug("Server received an invalid update");
SendError(e);
return false;
}
private bool HandleConnect(NetworkRequest r, RequestEventArgs e)
{
string address = string.Empty;
try
{
var iv = new ConnectVerb();
iv.ProcessRequest(r);
address = iv.Address;
if (string.IsNullOrEmpty(iv.Secret))
{
//Dont allow connections with no secret
return false;
}
//Dont allow connections to ourselves..
if (iv.Address == serverNode.Location)
return false;
//Only allow one connect attempt at once
lock (sync)
{
if (connectingIDs.Contains(address))
return false;
connectingIDs.Add(address);
}
//Connect to the remote client
var verb = new InfoVerb();
var client = new Client(serverNode);
if (!client.Execute(verb, address))
return false;
//Connected ok
var c = new ClientStream();
c.OnDisconnect += c_OnDisconnect;
Node n = verb.GetValidatedNode();
if (null == n)
return false;
n.Location = iv.Address;
n.Online = true;
n.NodeType = iv.ClientType;
n.OverlordID = serverNode.ID;
n.Secret = iv.Secret;
lock (sync)
{
//Notify other clients
var update = new UpdateVerb();
//Was this person already connected?
ClientStream search = connectedClientNodes.Where(xn => xn.Node.ID == n.ID).FirstOrDefault();
if (null != search)
{
connectedClientNodes.Remove(search);
search.Kill();
}
c.Start(n, serverNode);
connectedClientNodes.Add(c);
update.Nodes.Add(n);
NetworkRequest req = update.CreateRequest();
req.SourceID = serverNode.ID;
req.OverlordID = serverNode.ID;
req.AuthKey = iv.Secret;
SendToStandardClients(req);
//Dont send overlord logs to other overlords
if (n.NodeType != ClientType.Overlord)
SendToOverlordClients(req);
}
//Find client servers
ThreadPool.QueueUserWorkItem(ScanClientAsync, n);
//return ok
//Add headers
var headers = e.Response.Headers as HeaderCollection;
if (null != headers)
{
headers.Add("FAP-AUTH", iv.Secret);
headers.Add("FAP-SOURCE", serverNode.ID);
headers.Add("FAP-OVERLORD", serverNode.ID);
}
SendResponse(e, null);
//Send network info
if (n.NodeType == ClientType.Overlord)
{
var update = new UpdateVerb();
//Only send local nodes
foreach (
ClientStream peer in
connectedClientNodes.ToList().Where(x => x.Node.NodeType == ClientType.Client))
update.Nodes.Add(peer.Node);
NetworkRequest req = update.CreateRequest();
req.SourceID = serverNode.ID;
req.OverlordID = serverNode.ID;
req.AuthKey = iv.Secret;
c.AddMessage(req);
}
else
{
var update = new UpdateVerb();
//None overlord client. Send local nodes and external ones.
update.Nodes = GetBestKnownClientList();
NetworkRequest req = update.CreateRequest();
req.SourceID = serverNode.ID;
req.OverlordID = serverNode.ID;
req.AuthKey = iv.Secret;
c.AddMessage(req);
}
return true;
}
catch
{
}
finally
{
connectingIDs.Remove(address);
}
SendError(e);
return false;
}
private void uplink_OnDisconnect(Uplink s)
{
//A remote overlord has disconnected, notify local clients of all associated peering going offline.
lock (sync)
{
logger.Debug("Server had uplink disconnect to {0}", s.Destination.ID);
extOverlordServers.Remove(s);
var verb = new UpdateVerb();
foreach (Node node in externalNodes.ToList())
{
if (node.OverlordID == s.Destination.ID || node.ID == s.Destination.ID)
{
//Check the node isnt now logged on locally
if (connectedClientNodes.Where(n => n.Node.ID == node.ID).Count() > 0)
continue;
verb.Nodes.Add(new Node {ID = node.ID, Online = false});
}
externalNodes.Remove(node);
}
verb.Nodes.Add(new Node {ID = s.Destination.ID, Online = false});
NetworkRequest req = verb.CreateRequest();
req.OverlordID = serverNode.ID;
SendToStandardClients(req);
//Remove the overlord itself
if (extOverlordServers.Contains(s))
{
extOverlordServers.Remove(s);
}
}
}