private bool isLookupQueryValid(SignedQueryByName signedQuery)
{
UserEntry responder = ServerApp._pkiCommunicator.GetVerifiedUserPublicKey(whoSentQuery(signedQuery.Query));
if (responder != null)
{
RSACryptoServiceProvider responderProvider = new RSACryptoServiceProvider();
responderProvider.FromXmlString(responder.PubKey);
byte[] data = Encoding.Default.GetBytes(signedQuery.Query.ToString());
return responderProvider.VerifyData(data, "SHA1", signedQuery.Signature);
}
else
return false;
}
public void lookupname(SignedQueryByName incomingQuery)
{
ServerToServerServices friend;
RemoteAsyncLookupNameDelegate remoteDel;
QueryByName q = incomingQuery.Query;
QueryByName newQ = new QueryByName(q.Name, q.Uris, new List<string>(),q.Id);
newQ.ContactingServerUri.Clear();
newQ.ContactingServerUri.Add(ServerApp._primaryURI);
bool sendMessage = false;
System.Windows.Forms.MessageBox.Show(ServerApp._user.Username + " : Received the request.");
if (ServerApp._user.SentMessages.Contains(incomingQuery.Query.Id))
{
MessageBox.Show(ServerApp._user.Username + " : Message was already sent so the request was discarted!");
return;
}
if (ServerApp._user.ReceivedNameMessages.Contains(incomingQuery.Query))
{
MessageBox.Show(ServerApp._user.Username + " : Message was already received so the request was discarted!");
return;
}
//only accepts messages from predecessors!
if (!isPredecessor(incomingQuery.Query))
{
MessageBox.Show(ServerApp._user.Username + " says " + whoSentQuery(incomingQuery.Query)
+ " is trying to screw the comunication!");
return;
}
if (!isLookupQueryValid(incomingQuery)) {
MessageBox.Show(ServerApp._user.Username + " Could not verify lookup message");
return;
}
ServerApp._user.ReceivedNameMessages.Add(q);
//Is it receiving this message from the original requester? if so doesnt need consensus. (check expl @ shareObject())
if (incomingQuery.Query.ContactingServerUri.ElementAt(0).CompareTo(incomingQuery.Query.Uris.ElementAt(0)) == 0)
{
//Does not need consensus
MessageBox.Show(ServerApp._user.Username + ": Does not need consensus!");
sendMessage = true;
}
else
{
//consensus
sendMessage = consensus(incomingQuery.Query);
}
if (sendMessage)
{
MessageBox.Show(ServerApp._user.Username + ": Reached consensus!");
if (ServerApp._user.Username[0] == q.Name[0])
{
sendResponseToLookupQuery(q);
return;
}
/* sign the query which we send to our friends */
byte[] queryData = Encoding.Default.GetBytes(newQ.ToString());
byte[] signature = ServerApp._rsaProvider.SignData(queryData, "SHA1");
SignedQueryByName signedNewNameQuery = new SignedQueryByName(newQ, signature);
foreach (Friend i in ServerApp._user.Friends)
{
if (i.Uris.ElementAt(0) != null && i.SucessorSwarm)
{
if (i.Uris.ElementAt(0).CompareTo(q.ContactingServerUri.ElementAt(0)) != 0)
{
System.Windows.Forms.MessageBox.Show(ServerApp._user.Username + " : forwarding to : " + i.Name);
friend = ((ServerToServerServices)Activator.GetObject(typeof(ServerToServerServices),
i.Uris.ElementAt(0) + "/" + ServicesNames.ServerToServerServicesName));
remoteDel = new RemoteAsyncLookupNameDelegate(friend.lookupname);
remoteDel.BeginInvoke(signedNewNameQuery, null, null);
}
}
}
ServerApp._user.SentMessages.Add(incomingQuery.Query.Id);
}
else
MessageBox.Show(ServerApp._user + ": Didn't reach consensus yet!");
}
public void lookupname(QueryByName q)
{
System.Windows.Forms.MessageBox.Show(ServerApp._user.Username + " lookupname " + q.Name);
ServerToServerServices friend;
RemoteAsyncLookupNameDelegate remoteDel;
ClientServices client;
if (!ServerApp._serviceAvailable)
{
client = ((ClientServices)Activator.GetObject(typeof(ClientServices),
ServerApp._clientUri + "/" + ServicesNames.ClientServicesName));
new RemoteAsyncServiceUnavailableDelegate(client.serviceUnavailable).BeginInvoke(null, null);
return;
}
//One of this is the response uri and the other is the previous uri
q.Uris.Add(ServerApp._primaryURI);
q.ContactingServerUri.Add(ServerApp._primaryURI);
byte[] data = Encoding.Default.GetBytes(q.ToString());
byte[] signature = ServerApp._rsaProvider.SignData(data, "SHA1");
SignedQueryByName signedQuery = new SignedQueryByName(q, signature);
foreach (Friend i in ServerApp._user.Friends)
{
if (i.Uris.ElementAt(0) != null && i.SucessorSwarm) //only sends to the sucessor nodes
{
friend = ((ServerToServerServices)Activator.GetObject(typeof(ServerToServerServices),
i.Uris.ElementAt(0) + "/" + ServicesNames.ServerToServerServicesName));
remoteDel = new RemoteAsyncLookupNameDelegate(friend.lookupname);
remoteDel.BeginInvoke(signedQuery, null, null);
}
}
}