public CommonChat()
{
InitializeComponent();
FriendsChat = new Dictionary <string, ListBox>();
Client = new UdpClient();
_newMessage = new SoundPlayer(@"..\..\Resources\newMessage.wav");
TabControlStatic = tabControl;
MsgBoxStatic = msgBox;
SendBtnStatic = sendBtn;
tabControl.TabPages.Clear();
RSATools.GenerateKeys(out LocalPublicKey, out _localPrivateKey);
Database.GetFriends();
LocalPort = Database.GetLocalPort();
// Si aucun ami n'a été ajouté
if (TabControlStatic.TabCount == 0)
{
sendBtn.Enabled = false;
msgBox.Enabled = false;
}
_threadLoop = true;
Restart_Thread();
}
/// <summary>
/// Ecoute en permanance le trafic sur le port d'écoute
/// </summary>
private void Listen()
{
UdpClient server = null;
try
{
server = new UdpClient(LocalPort);
}
catch
{
// impossible d'accéder au port
Thread.Sleep(100);
return;
}
server.Client.ReceiveTimeout = 1000;
while (_threadLoop)
{
try
{
IPEndPoint ep = new IPEndPoint(IPAddress.Any, LocalPort);
byte[] data = server.Receive(ref ep);
string uncryptedMsg = Encoding.UTF8.GetString(data);
// Si le message en dur (avant décryptage) et qu'il provient du bon EndPoint.
if (uncryptedMsg == "RESET_KEY")
{
Invoke(new Action <string, string>(Database.SetKey), Database.GetNameByIP(ep.Address), "WAITING_FOR_KEY");
}
const string beginning = "<RSAKeyValue><Modulus>";
const string middle = "</Modulus><Exponent>";
const string ending = "</Exponent></RSAKeyValue>";
// Vérifie que c'est une clé publique valide
if (data.Length == 415)
{
if (uncryptedMsg.Substring(0, beginning.Length) == beginning && uncryptedMsg.Substring(uncryptedMsg.Length - ending.Length - 4 - middle.Length, middle.Length) == middle && uncryptedMsg.Substring(uncryptedMsg.Length - ending.Length, ending.Length) == ending)
{
// Remplace la clé de l'ami actuel
Invoke(new Action <string, string>(Database.SetKey), Database.GetNameByIP(ep.Address), uncryptedMsg);
msgBox.Enabled = true;
continue;
}
}
string decryptedMsg = Encoding.UTF8.GetString(RSATools.RSADecrypt(data, _localPrivateKey, false));
Invoke(new Action <string, string>(AddLog), decryptedMsg, Database.GetNameByIP(ep.Address));
}
catch
{
// do nothing
}
}
server.Close();
}
/// <summary>
/// Envoie un message à l'ami actif
/// </summary>
/// <param name="msg">Message à envoyer</param>
/// <param name="isKeyMsg">Le message est-il l'envoi de notre clé public ou la demande de reset de clé (pour ne pas l'écrire)</param>
/// <param name="toEveryone">Le message s'envoie-il à tous les contacts</param>
public static void SendMessage(string msg, bool isKeyMsg, bool toEveryone)
{
if (CommonChat.TabControlStatic.TabPages.Count != 0)
{
XmlDocument doc = new XmlDocument();
doc.Load("users.xml");
// Valeurs par défaut
int remotePort = 5053;
string remotePublicKey = CommonChat.LocalPublicKey;
IPAddress remoteIPAddress = IPAddress.Broadcast;
foreach (XmlNode node in doc.DocumentElement)
{
if (node.Name == "friend")
{
string name = node.Attributes[0].InnerText;
if (name == CommonChat.TabControlStatic.SelectedTab.Text)
{
// load his public key to encrypt message
remotePublicKey = node.ChildNodes[2].InnerText;
remotePort = Int32.Parse(node.ChildNodes[1].InnerText);
remoteIPAddress = IPAddress.Parse(node.ChildNodes[0].InnerText);
break;
}
}
}
byte[] data = Encoding.UTF8.GetBytes(msg);
byte[] encryptedData;
if (isKeyMsg)
{
// n'encrypte pas le message si c'est une clé
encryptedData = data;
}
else
{
encryptedData = RSATools.RSAEncrypt(data, remotePublicKey, false);
}
if (toEveryone)
{
foreach (string friendName in GetFriendNames())
{
// Se connecte à l'ami actif
ConnectToFriend(friendName);
if (!isKeyMsg)
{
CommonChat.FriendsChat[CommonChat.TabControlStatic.SelectedTab.Text].Items.Add("Moi [" + DateTime.Now + "] > " + msg);
}
CommonChat.Client.Send(encryptedData, encryptedData.Length);
CommonChat.MsgBoxStatic.Text = "";
}
}
else
{
// Se connecte à l'ami actif
ConnectToFriend(CommonChat.TabControlStatic.SelectedTab.Text);
if (!isKeyMsg)
{
CommonChat.FriendsChat[CommonChat.TabControlStatic.SelectedTab.Text].Items.Add("Moi [" + DateTime.Now + "] > " + msg);
}
CommonChat.Client.Send(encryptedData, encryptedData.Length);
CommonChat.MsgBoxStatic.Text = "";
}
CommonChat.Client.Close();
CommonChat.MsgBoxStatic.Select();
}
}
