//单击发送按钮，开始通信
private void btnSend_Click(object sender, EventArgs e)
{
//开始检查是否选中了通信对象
if (-1 == this.lbxComClient.SelectedIndex)
{
MessageBox.Show(" 请选择需要通信的用户！ ");
return;
}
//检测是否在文本框中输入了内容
if (string.Empty == this.txtInput.Text)
{
MessageBox.Show(" 不能发送空消息！ ");
return;
}
//开始检查是否选中了通信对象
if (this.txtInput.Text.Length > 100)
{
MessageBox.Show(" 输入的文本不要大于100个字符！ ");
return;
}
//发送通信报文
string reqMsg = null;
//目的地址用户名
//源地址用户名
string username1 = hostIP.Replace('.', 'a') + "b" + hostPort;
string username2 = this.lbxComClient.SelectedItem.ToString();
//找出comClient
int i = 0;
ComClient c = null;
for (i = 0; i < comClients.Count; i++)
{
if (username2 == ((ComClient)comClients[i]).Username)
{
c = (ComClient)comClients[i];
break;
}
}
if (i >= comClients.Count)
{
MessageBox.Show(" 通信对象已经不存在！ ");
return;
}
else
{
//通信内容
string msg = new AES(c.Kaes).AesEncipher(this.txtInput.Text);
//构造报文
reqMsg = "7|" + username1 + "|" + username2 + "|" + msg;
//发送报文
sendMessage(aes.AesEncipher(reqMsg), IPAddress.Parse(serverIP), int.Parse(serverPort));
//页面显示
this.txtShowMessage.AppendText("\r\n" + username1 + "—>" + this.lbxComClient.SelectedItem.ToString() + " " + TimeUtil.getNowTime() + "\r\n " + this.txtInput.Text);
this.txtInput.Clear();
this.txtInput.Focus();
}
}
private void ReceiveData()
{
UdpClient udpClient = new UdpClient(int.Parse(hostPort));
//远程主机节点
IPEndPoint remote = null;
// RSA rsa = new RSA();
// AES aes = new AES(KDCaes);
//接收从远程主机发送过来的信息
while (true)
{
//关闭udpClient时此句会产生异常
byte[] bytes = udpClient.Receive(ref remote);
string recStr = aes.AesDecipher(Encoding.UTF8.GetString(bytes, 0, bytes.Length)).Trim();
string[] recStrArr = recStr.Split('|');
if ("1" == recStrArr[0])
{
//this.txtConInfo.AppendText("\r\n" + string.Format("来自{0}：{1}", remote, recStr));
if ("CONNECT" == recStrArr[1])
{
this.txtConInfo.AppendText("\r\n" + hostIP + ":" + hostPort + " 服务器连接成功");
this.btnRegistration.Enabled = true;
//this.btnConnect.Enabled = false;
}
else
{
//服务器连接失败
}
}
if ("2" == recStrArr[0])
{
this.txtRegInfo.AppendText("\r\n" + string.Format("来自{0}：{1}", remote, recStr));
string username = hostIP.Replace('.', 'a') + "b" + hostPort;
string str = rsa.Decryption(recStrArr[1], KDCe, KDCn);
if ("exist" == str)
{
this.txtRegInfo.AppendText("\r\n" + username + "用户已经注册成功。。。");
}
else if (username == str)
{
this.txtRegInfo.AppendText("\r\n" + "注册成功。。。");
this.btnGetCertificate.Enabled = true;
}
else
{
//注册失败
}
}
if ("3" == recStrArr[0])
{
this.txtRegInfo.AppendText("\r\n" + string.Format("来自{0}：{1}", remote, recStr));
string username = hostIP.Replace('.', 'a') + "b" + hostPort;
string userKe = USERe + "a" + USERn;
string message = string.Empty;
string str = rsaDeByKe(recStrArr[1]);
// this.txtRegInfo.AppendText("\r\n----------" + str.Split('c')[0]+"|");
// this.txtRegInfo.AppendText("\r\n----------" + str.Split('c')[1]+"|");
if ("exist" == str)
{
message = "\r\n用户：" + username + " 已经取得证书。。。";
}
else if (username == str.Split('c')[0] && userKe == str.Split('c')[1])
{
//获得证书成功
message = "\r\n从服务器取得证书：< " + username + " , " + userKe + " >";
this.btnGetUserKey.Enabled = false;
}
if (message != string.Empty)
{
this.txtRegInfo.AppendText(message);
}
}
//广播取得证书用户
if ("4" == recStrArr[0])
{
//刷新当前用户数组
this.cerClients.Clear();
for (int i = 1; i < recStrArr.Length; i++)
{
this.cerClients.Add(recStrArr[i]);
}
//页面显示当前所有取得证书的用户
this.lbxOnlineClient.Items.Clear();
try
{
this.lbxOnlineClient.BeginUpdate();
for (int i = 0; i < cerClients.Count; i++)
{
this.lbxOnlineClient.Items.Add(cerClients[i].ToString());
}
}
catch (Exception e)
{
MessageBox.Show(e.ToString());
}
finally {
this.lbxOnlineClient.EndUpdate();
}
//Thread.Sleep(200);
//this.txtComStatus.AppendText("刷新在线用户。。。\r\n");
}
//会话请求返回报文
if ("5" == recStrArr[0])
{
string str = rsaDeByKe(recStrArr[1]);
string message = string.Empty;
//this.txtInput.AppendText("\r\n" + str);
if ("exist" == str)
{
message = "\r\n用户：此通信组已经取得会话密钥。。。";
}
else
{
//获得通信组
string strRN = rsaDeByKd(str.Replace('d', '$'));
string hostUsername = hostIP.Replace('.', 'a') + "b" + hostPort;
string comUsername = null;
string rn = null;
string ticks = null;
string[] msg = strRN.Split('c');
if (msg[0] != hostUsername)
{
comUsername = msg[0];
}
else
{
comUsername = msg[1];
}
rn = msg[2];
ticks = msg[3];
ComClient comClient = new ComClient(comUsername, rn, ticks);
comClients.Add(comClient);
//页面显示
this.lbxComClient.Items.Clear();
for (int i = 0; i < comClients.Count; i++)
{
this.lbxComClient.Items.Add(((ComClient)comClients[i]));
}
message = "\r\n服务器返回报文：" + strRN;
}
if (message != string.Empty)
{
this.txtComStatus.AppendText(message);
}
}
//会话取消返回报文
if ("6" == recStrArr[0])
{
this.txtComStatus.AppendText("\r\n取消会话：" + recStrArr[1]);
int i = 0;
int len = comClients.Count;
if (comClients.Count != 0)
{
for (i = 0; i < len; i++)
{
if (recStrArr[1] == ((ComClient)comClients[i]).Username)
{
//删除此会话
comClients.RemoveAt(i);
break;
}
}
if (i >= len)
{
//已经没有此会话了
}
else
{
//页面显示
this.lbxComClient.Items.Clear();
for (int j = 0; j < comClients.Count; j++)
{
this.lbxComClient.Items.Add(((ComClient)comClients[j]));
}
}
}
}
//接受通信消息
if ("7" == recStrArr[0])
{
//源地址 用户名
//string username = recStrArr[1];
//主机名称
string username = hostIP.Replace('.', 'a') + "b" + hostPort;
int i = 0;
for (i = 0; i < comClients.Count; i++)
{
if (recStrArr[1] == ((ComClient)comClients[i]).Username)
{
break;
}
}
if (i >= comClients.Count)
{
//已经没有此会话了
}
else
{
this.txtShowMessage.AppendText("\r\n" + recStrArr[1] + "—>" + username + " " + TimeUtil.getNowTime() + "\r\n " + new AES(((ComClient)comClients[i]).Kaes).AesDecipher(recStrArr[2]).Trim());
}
// this.txtShowMessage.AppendText("\r\n" +recStrArr[1]+" "+TimeUtil.getNowTime()+"\r\n "+recStrArr[2]);
}
//用户断开消息
if ("8" == recStrArr[0])
{
string username = rsa.Decryption(recStrArr[1], KDCe, KDCn);
// this.txtComStatus.AppendText("\r\n-----断开：" + username);
int i = 0;
for (i = 0; i < cerClients.Count; i++)
{
if (cerClients[i].ToString() == username)
{
cerClients.RemoveAt(i);
break;
}
}
i = 0;
for (i = 0; i < comClients.Count; i++)
{
if (((ComClient)comClients[i]).Username == username)
{
comClients.RemoveAt(i);
break;
}
}
//页面显示
this.lbxComClient.Items.Clear();
for (int j = 0; j < comClients.Count; j++)
{
this.lbxComClient.Items.Add(((ComClient)comClients[j]));
}
this.lbxOnlineClient.Items.Clear();
for (i = 0; i < cerClients.Count; i++)
{
this.lbxOnlineClient.Items.Add(cerClients[i].ToString());
}
this.txtComStatus.AppendText("\r\n----" + username + "断开连接");
}
if ("9" == recStrArr[0])
{
string command = rsa.Decryption(recStrArr[1], KDCe, KDCn);
if ("disconnect" == command)
{
//服务器断开 清空所有用户
cerClients.Clear();
comClients.Clear();
this.lbxComClient.Items.Clear();
this.lbxOnlineClient.Items.Clear();
this.txtComStatus.AppendText("\r\n服务器断开。。。。");
}
}
}
}