public static Message MessageReceivedHandler(PacketReceivedEventArgs args)
{
args.Data = ChatTwo_Protocol.RemoveSignatureAndMac(args.Data);
Message messageObj = new Message();
messageObj.Ip = args.Sender;
int milliseconds = ByteHelper.ToInt32(args.Data, 0);
messageObj.Timez = String.Format("{0}:{1}:{2}", (milliseconds / (60 * 60 * 1000)) % 24, (milliseconds / (60 * 1000)) % 60, (milliseconds / (1000)) % 60);
messageObj.From = ByteHelper.ToInt32(args.Data, 4);
messageObj.Type = (MessageType)args.Data[8];
messageObj.Data = ByteHelper.SubArray(args.Data, 9);
return(messageObj);
}
public static void MessageTransmissionHandler(Message message)
{
byte[] messageBytes = ChatTwo_Protocol.MessageTransmissionHandler(message);
string sharedSecret;
if (message.Type == ChatTwo_Protocol.MessageType.CreateUser)
{
sharedSecret = ChatTwo_Protocol.DefaultSharedSecret;
}
else if (message.Type == ChatTwo_Protocol.MessageType.Login)
{
ServerSharedSecret = ByteHelper.GetHashString(messageBytes);
sharedSecret = ServerSharedSecret;
}
else if (message.To == ChatTwo_Protocol.ServerReserrvedUserID)
{
sharedSecret = ServerSharedSecret;
}
else
{
int userId = message.To;
sharedSecret = _contacts.Find(x => x.ID == userId).Secret;
// Testing!!!! REMOVE THIS!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
sharedSecret = ChatTwo_Protocol.DefaultSharedSecret;
}
messageBytes = ChatTwo_Protocol.AddSignatureAndMac(messageBytes, sharedSecret);
// Fire an OnMessageTransmission event.
PacketTransmissionEventArgs args = new PacketTransmissionEventArgs();
args.Destination = message.Ip;
args.PacketContent = messageBytes;
OnMessageTransmission(args);
}
public static void MessageReceivedHandler(object sender, PacketReceivedEventArgs args)
{
if (args.Data[0] == 0x92)
{
string sharedSecret;
// Position of the Type byte is 30 (SignatureByteLength + MacByteLength + TimezByteLength + UserIdByteLength).
ChatTwo_Protocol.MessageType type = (ChatTwo_Protocol.MessageType)args.Data[ChatTwo_Protocol.SignatureByteLength + ByteHelper.HashByteLength + 4 + 4];
// Position of the UserID bytes is 26 (SignatureByteLength + MacByteLength + TimezByteLength) with a length of 4.
int senderId = ByteHelper.ToInt32(args.Data, ChatTwo_Protocol.SignatureByteLength + ByteHelper.HashByteLength + 4);
if (type == ChatTwo_Protocol.MessageType.CreateUserReply)
{
sharedSecret = ChatTwo_Protocol.DefaultSharedSecret;
}
else if (senderId == 0)
{
sharedSecret = ServerSharedSecret;
}
else
{
sharedSecret = _contacts.Find(x => x.ID == senderId).Secret;
// Testing!!!! REMOVE THIS!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
sharedSecret = ChatTwo_Protocol.DefaultSharedSecret;
}
if (ChatTwo_Protocol.ValidateMac(args.Data, sharedSecret))
{
Message message = ChatTwo_Protocol.MessageReceivedHandler(args);
switch (message.Type)
{
case ChatTwo_Protocol.MessageType.CreateUserReply:
{
// Fire an OnCreateUserReply event.
CreateUserReplyEventArgs argsCreateUser = new CreateUserReplyEventArgs();
argsCreateUser.Success = message.Data[0] == 0x00;
switch (message.Data[0])
{
case 0: // Success.
break;
case 1: // Username already exist.
argsCreateUser.Message = "A user already exist with that name.";
break;
case 2:
argsCreateUser.Message = "Username is too short or too long.";
break;
}
OnCreateUserReply(argsCreateUser);
break;
}
case ChatTwo_Protocol.MessageType.LoginReply:
{
// Fire an OnLoginReply event.
LoginReplyEventArgs argsLogin = new LoginReplyEventArgs();
argsLogin.Success = message.Data[0] == 0x00;
switch (message.Data[0])
{
case 0: // Success.
int userId = ByteHelper.ToInt32(message.Data, 1);
string username = Encoding.Unicode.GetString(ByteHelper.SubArray(message.Data, 5));
LogIn(userId);
_user.Name = username;
argsLogin.Name = username;
break;
case 1: // Wrong password.
argsLogin.Message = "Wrong username or password.";
break;
case 2: // Already online.
argsLogin.Message = "That user is already online.";
break;
}
OnLoginReply(argsLogin);
break;
}
case ChatTwo_Protocol.MessageType.ContactRequestReply:
{
// Fire an OnAddContactReply event.
AddContactReplyEventArgs argsAddContact = new AddContactReplyEventArgs();
argsAddContact.Success = message.Data[0] == 0x00;
switch (message.Data[0])
{
case 0: // Success.
break;
case 1: // No user with that name.
argsAddContact.Message = "No user with that name.";
break;
case 2: // You can't add your self.
argsAddContact.Message = "You can't add your self.";
break;
case 3: // User is already a contact.
argsAddContact.Message = "User is already a contact.";
break;
}
OnAddContactReply(argsAddContact);
break;
}
case ChatTwo_Protocol.MessageType.ContactStatus:
{
int contactId = ByteHelper.ToInt32(message.Data, 0);
int nameLength = ((31 & message.Data[4]) * 2);
ContactObj contact;
if (_contacts.Any(x => x.ID == contactId))
{
contact = _contacts.Find(x => x.ID == contactId);
}
else
{
contact = new ContactObj();
contact.ID = contactId;
contact.Name = Encoding.Unicode.GetString(message.Data, 5, nameLength);
_contacts.Add(contact);
}
contact.Online = ByteHelper.CheckBitCodeIndex(message.Data[4], 7);
contact.RelationshipTo = ByteHelper.CheckBitCodeIndex(message.Data[4], 6);
contact.RelationshipFrom = ByteHelper.CheckBitCodeIndex(message.Data[4], 5);
if (contact.Online)
{
int port = ByteHelper.ToInt32(message.Data, 5 + nameLength);
contact.Socket = new IPEndPoint(new IPAddress(ByteHelper.SubArray(message.Data, 5 + nameLength + 4)), port);
}
// Fire an OnContactUpdate event.
OnContactUpdate();
break;
}
case ChatTwo_Protocol.MessageType.Message:
{
ContactObj contact;
if (_contacts.Any(x => x.ID == message.From && x.RelationshipTo && x.RelationshipFrom))
{
contact = _contacts.Find(x => x.ID == message.From);
OpenChat(contact.ID);
message.Text = Encoding.Unicode.GetString(message.Data);
contact.ChatWindow.ReceiveMessage(message.Text);
}
else
#if DEBUG
{ throw new NotImplementedException("You received a message from someone that isn't your contact?"); }
#else
{ return; }
#endif
break;
}
}
}
#if DEBUG
else
{
throw new NotImplementedException("Could not validate the MAC of received message.");
}
// Need to add a simple debug message here, but this works as a great breakpoint until then.
#endif
}
#if DEBUG
else
{
throw new NotImplementedException("Could not validate the signature of the received message. The signature was \"0x" + args.Data[0] + "\" but only \"0x92\" is allowed.");
}
// Need to add a simple debug message here, but this works as a great breakpoint until then.
#endif
}