/// <summary>拒绝</summary>
/// <param name="dhcp"></param>
/// <param name="state"></param>
protected virtual void OnNak(DhcpEntity dhcp, Object state)
{
WriteLog("被拒绝 {0} 来自 {1}", Address, state);
// 查找拒绝原因
var opt = dhcp.Get(DhcpOptions.Message);
if (opt != null)
{
WriteLog("拒绝原因：{0}", opt.ToStr());
}
}
void Client_Received(object sender, ReceivedEventArgs e)
{
var dhcp = new DhcpEntity();
dhcp.Read(e.Stream, null);
var kind = dhcp.Kind;
WriteLog("收到：{0}", dhcp);
switch (kind)
{
case DhcpMessageType.Offer:
OnOffer(dhcp, e.UserState);
break;
case DhcpMessageType.Ack:
OnAck(dhcp, e.UserState);
break;
case DhcpMessageType.Nak:
OnNak(dhcp, e.UserState);
break;
default:
WriteLog("未知消息：\r\n{0}", dhcp);
break;
}
}
/// <summary>确认</summary>
/// <param name="dhcp"></param>
/// <param name="state"></param>
protected virtual void OnAck(DhcpEntity dhcp, Object state)
{
WriteLog("已确认地址 {0} 来自 {1}", Address, state);
// 查找租约时间
var opt = dhcp.Get(DhcpOptions.IPLeaseTime);
if (opt != null)
{
var buf = opt.Data.ReadBytes();
buf.Reverse();
var ts = new TimeSpan(0, 0, buf.ToInt());
WriteLog("租约到期：{0}", ts);
}
}
/// <summary>发送请求</summary>
public void SendRequest()
{
var dhcp = new DhcpEntity();
dhcp.Kind = DhcpMessageType.Request;
Send(dhcp);
}
/// <summary>提供IP</summary>
/// <param name="dhcp"></param>
/// <param name="state"></param>
protected virtual void OnOffer(DhcpEntity dhcp, Object state)
{
if (dhcp.TransactionID != TransID)
{
XTrace.Log.Error("响应消息事务不等于本地事务 0x{0:X8} != 0x{1:X8}", dhcp.TransactionID, TransID);
return;
}
Address = new IPAddress(dhcp.YourIP);
WriteLog("得到地址 {0} 来自 {1}", Address, state);
foreach (var item in dhcp.Options)
{
WriteLog("{0,-16}: {1}", item.Option, item.ToStr());
}
// 发送确认
SendRequest();
}
/// <summary>广播发现</summary>
public void SendDiscover()
{
var dhcp = new DhcpEntity();
dhcp.Kind = DhcpMessageType.Discover;
Send(dhcp);
}
/// <summary>发送DHCP消息</summary>
/// <param name="dhcp"></param>
protected void Send(DhcpEntity dhcp)
{
dhcp.ClientMac = Mac;
var opt = new DhcpOption();
opt.SetClientId(Mac);
dhcp.Options.Add(opt);
if (Address != IPAddress.Any)
{
opt = new DhcpOption();
opt.SetData(DhcpOptions.RequestedIP, Address.GetAddressBytes());
dhcp.Options.Add(opt);
}
opt = new DhcpOption();
opt.SetData(DhcpOptions.HostName, ("WSWL_SmartOS_").GetBytes());
dhcp.Options.Add(opt);
opt = new DhcpOption();
opt.SetData(DhcpOptions.Vendor, "http://www.NewLifeX.com".GetBytes());
dhcp.Options.Add(opt);
opt = new DhcpOption();
opt.SetData(DhcpOptions.ParameterList, new Byte[] { 0x01, 0x06, 0x03, 0x2b });
dhcp.Options.Add(opt);
dhcp.TransactionID = TransID;
WriteLog("发送：{0}", dhcp);
var buf = dhcp.ToArray();
Client.Client.Broadcast(buf, 68);
}
