/// <summary>
/// 处理握手
/// </summary>
private bool DoShakeHands()
{
byte[] buffer;
byte method = 0xFF; //命令不支持
if (SocketUtils.Receive(this.Client, 2, out buffer))
{
if (buffer.Length == 2)
{
//取得认证方法列
if (SocketUtils.Receive(this.Client, (uint)buffer[1], out buffer))
{
if (this.Server.RequireValidate)
{
//需要验证身份,所以判断客户端是否支持用户名与密码验证
foreach (byte b in buffer)
{
if (b == 0x02)
{
method = 0x02; //客户端支持户名与密码验证
}
}
}
else
{
//不需要验证身份
method = 0x00;
}
}
}
}
//发送应答
SocketUtils.Send(this.Client, new byte[] { 0x05, method });
return(method != 0xFF);
}
/// <summary>
/// 处理协议请求
/// </summary>
private bool DoProtocolRequest()
{
//取前4字节
byte[] buffer;
IPAddress ipAddress = null;
byte rep = 0x07; //不支持的命令
if (SocketUtils.Receive(this.Client, 4, out buffer))
{
if (buffer.Length == 4)
{
//判断地址类型
switch (buffer[3])
{
case 0x01:
//IPV4
if (SocketUtils.Receive(this.Client, 4, out buffer))
{
ipAddress = new IPAddress(buffer);
}
break;
case 0x03:
//域名
if (SocketUtils.Receive(this.Client, 1, out buffer))
{
//取得域名的长度
if (SocketUtils.Receive(this.Client, (uint)(buffer[0]), out buffer))
{
//取得域名地址
string address = Encoding.ASCII.GetString(buffer);
IPAddress[] addresses = Dns.GetHostAddresses(address);
if (addresses.Length != 0)
{
ipAddress = addresses[0];
}
else
{
rep = 0x04; //主机不可达
}
}
}
break;
case 0x04:
//IPV6;
if (SocketUtils.Receive(this.Client, 16, out buffer))
{
ipAddress = new IPAddress(buffer);
}
break;
default:
rep = 0x08; //不支持的地址类型
break;
}
}
}
if (ipAddress != null && rep == 0x07)
{
//取得端口号
if (SocketUtils.Receive(this.Client, 2, out buffer))
{
Array.Reverse(buffer); //反转端口值
this.RemoteEndPoint = new IPEndPoint(ipAddress, BitConverter.ToUInt16(buffer, 0));
rep = 0x00;
this.Server.WriteLineLog(string.Format("于{0}接收到客户端要求对主机{1}进行连接的请求....", DateTime.Now, this.RemoteEndPoint));
}
}
//输出应答
MemoryStream stream = new MemoryStream();
stream.WriteByte(0x05);
stream.WriteByte(rep);
stream.WriteByte(0x00);
stream.WriteByte(0x01);
IPEndPoint localEP = (IPEndPoint)Client.LocalEndPoint;
byte[] localIP = localEP.Address.GetAddressBytes();
stream.Write(localIP, 0, localIP.Length);
byte[] localPort = BitConverter.GetBytes((ushort)IPAddress.HostToNetworkOrder(localEP.Port));
stream.Write(localPort, 0, localPort.Length);
SocketUtils.Send(this.Client, stream.ToArray());
return(this.RemoteEndPoint != null);
}
/// <summary>
/// 处理身份验证
/// </summary>
private bool ValidateIdentity()
{
byte[] buffer;
byte ep = 0xFF;
string username = string.Empty, password = string.Empty;
//报文格式:0x01 | 用户名长度（1字节）| 用户名（长度根据用户名长度域指定） | 口令长度（1字节） | 口令（长度由口令长度域指定）
if (SocketUtils.Receive(this.Client, 2, out buffer))
{
if (buffer.Length == 2)
{
//用户名为空
if (buffer[1] == 0x00)
{
if (string.IsNullOrEmpty(this.Server.UserName))
{
ep = 0x00; //用户名为空
}
}
else
{
if (SocketUtils.Receive(this.Client, (uint)buffer[1], out buffer))
{
username = Encoding.ASCII.GetString(buffer);
if (!string.IsNullOrEmpty(this.Server.UserName))
{
ep = (byte)(username.Equals(this.Server.UserName) ? 0x00 : 0xFF);
}
}
}
if (ep == 0x00)
{
ep = 0xFF;
//判断密码
if (SocketUtils.Receive(this.Client, 1, out buffer))
{
if (buffer[0] == 0x00)
{
if (!string.IsNullOrEmpty(this.Server.Password))
{
ep = 0x00; //密码为空
}
}
else
{
if (SocketUtils.Receive(this.Client, (uint)buffer[0], out buffer))
{
password = Encoding.ASCII.GetString(buffer);
if (!string.IsNullOrEmpty(this.Server.Password))
{
ep = (byte)(password.Equals(this.Server.Password) ? 0x00 : 0xFF);
}
}
}
}
}
}
}
//输出应答
SocketUtils.Send(this.Client, new byte[] { 0x01, ep });
this.Server.WriteLineLog(string.Format("于{0}接收到客户端{1}的身份验证请求[UserName={3},Password={4}],结果:{2}...",
DateTime.Now, this.Client.RemoteEndPoint, (ep == 0x00 ? "通过" : "失败"), username, password));
return(ep == 0x00);
}