2.11.2

Plain Craft Launcher 2/Pages/PageLink/PageLinkMain.xaml

@@ -122,11 +122,16 @@
             </Grid>
             <Grid x:Name="PanFinish" Visibility="Collapsed" HorizontalAlignment="Center" VerticalAlignment="Center" MinWidth="300">
                 <Grid.RowDefinitions>
+                    <RowDefinition Height="30" />
+                    <RowDefinition Height="35" />
                     <RowDefinition Height="Auto" />
                     <RowDefinition Height="25" />
                     <RowDefinition Height="Auto" />
+                    <RowDefinition Height="60" />
                 </Grid.RowDefinitions>
-                <local:MyCard HorizontalAlignment="Center" VerticalAlignment="Center" CornerRadius="12">
+                <local:MyHint Text="你的网络环境差，正使用社区节点进行中继。" HasBorder="True"
+                              HorizontalAlignment="Center" x:Name="HintFinish" Theme="Yellow" />
+                <local:MyCard Grid.Row="2" HorizontalAlignment="Center" VerticalAlignment="Center" CornerRadius="12">
                     <Grid>
                         <Grid.ColumnDefinitions>
                             <ColumnDefinition Width="25" />
@@ -156,7 +161,7 @@
                         <local:MyButton x:Name="BtnFinishExit" Grid.Column="5" Grid.Row="3" Text="退出" Padding="13,8" />
                     </Grid>
                 </local:MyCard>
-                <local:MyCard Grid.Row="2" HorizontalAlignment="Center" VerticalAlignment="Center" CornerRadius="8">
+                <local:MyCard Grid.Row="4" HorizontalAlignment="Center" VerticalAlignment="Center" CornerRadius="8">
                     <StackPanel Orientation="Horizontal" Margin="3,0">
                         <StackPanel x:Name="BtnFinishPing" Orientation="Horizontal" Background="{StaticResource ColorBrushSemiTransparent}"
                                     ToolTip="延迟" ToolTipService.Placement="Center" ToolTipService.InitialShowDelay="50" ToolTipService.VerticalOffset="40" ToolTipService.HorizontalOffset="4">

Plain Craft Launcher 2/Pages/PageLink/PageLinkMain.xaml.vb

@@ -1,6 +1,8 @@
-Imports System.Net.Sockets
+Imports System.Globalization
+Imports System.Net.Sockets
 
 Public Class PageLinkMain
+    Private Const INVITE_CODE_VERSION As Integer = 2
 
     '===============================
     '  状态机与前端页面
@@ -106,6 +108,7 @@ Public Class PageLinkMain
         End Function
         NetworkName = $"P{RadixConvert(ServerPort, 10, 16).PadLeft(4, "0"c)}-{GenerateRandomCode()}"
         NetworkSecret = GenerateRandomCode()
+        DiscoverNodeID = -1
         Log($"[Link] 尝试创建房间，网络名 {NetworkName}，网络密码 {NetworkSecret}，端口 {ServerPort}")
         '启动
         ChangeState(LinkStates.Loading)
@@ -118,7 +121,7 @@ Public Class PageLinkMain
     ''' </summary>
     Public Shared Sub Join() Handles PanSelectJoin.MouseLeftButtonUp
         Dim Code As String = MyMsgBoxInput("输入邀请码", "输入房主发给你的邀请码。",
-            HintText:=If(String.IsNullOrEmpty(LastCode), "", "使用上一次的邀请码：" & LastCode))
+            HintText:=If(String.IsNullOrEmpty(LastCode), "", "使用上一次的邀请码"))
         If Not String.IsNullOrEmpty(LastCode) AndAlso Code IsNot Nothing AndAlso Code = "" Then Code = LastCode
         If Code Is Nothing Then Return
         Join(Code)
@@ -126,27 +129,32 @@ Public Class PageLinkMain
     Public Sub JoinInternal(Code As String)
         If Code Is Nothing Then Return
         '基础格式校验
-        Code = Code.Between("【", "】").Between("[", "]") '从完整消息中提取
-        Code = Code.ToUpper.Replace("O", "0").Replace("I", "1") '输入修正
         Dim ValidateResult = ValidateCodeFormat(Code)
         If ValidateResult IsNot Nothing Then
             Hint(ValidateResult, HintType.Red)
             Return
         End If
+        Code = FixCodeFormat(Code)
+        Log($"[Link] 实际使用的邀请码：{Code}")
         '基础信息
         IsServerSide = False
         ServerPort = RadixConvert(Code.Substring(1, 4), 16, 10)
         NetworkName = Code.Substring(0, 11)
         NetworkSecret = Code.Substring(12, 5)
-        Log($"[Link] 尝试加入房间，网络名 {NetworkName}，网络密码 {NetworkSecret}，端口 {ServerPort}")
+        If Code.Substring(20, 3) = "000" Then
+            DiscoverNodeID = -2
+        Else
+            DiscoverNodeID = RadixConvert(Code.Substring(20, 3), 16, 10)
+        End If
+        Log($"[Link] 尝试加入房间，网络名 {NetworkName}，网络密码 {NetworkSecret}，端口 {ServerPort}，发现节点 {DiscoverNodeID}")
         '启动
         LastCode = Code
         ChangeState(LinkStates.Loading)
     End Sub
     Public Shared Function ValidateCodeFormat(Code As String) As String
         If Code Is Nothing Then Return "邀请码为空！"
-        Code = Code.Between("【", "】").Between("[", "]") '从完整消息中提取
-        Code = Code.ToUpper.Replace("O", "0").Replace("I", "1") '输入修正
+        Code = FixCodeFormat(Code)
+        '判断类型
         If Not (Code.Length >= 14 AndAlso Code(0) = "P"c AndAlso Code(5) = "-"c AndAlso Code(11) = "-"c) Then
             If Code.StartsWithF("U/") Then 'HMCL
                 Return "请让房主使用 PCL 创建房间！"
@@ -156,8 +164,20 @@ Public Class PageLinkMain
                 Return "邀请码有误，请让房主使用 PCL 创建房间！"
             End If
         End If
+        '校验版本
+        If Code.Length >= 23 AndAlso Code(17) = "-"c AndAlso
+            Val(Code.Substring(18, 2)) > INVITE_CODE_VERSION Then Return "你的 PCL 版本太老了，请在更新 PCL 之后再联机！"
         Return Nothing
     End Function
+    Private Shared Function FixCodeFormat(Code As String) As String
+        Code = Code.Between("【", "】").Between("[", "]") '从完整消息中提取
+        Code = Code.ToUpper.Replace("O", "0").Replace("I", "1") '输入修正
+        '版本 1 兼容
+        If Code.Length >= 17 AndAlso (Code.Length < 23 OrElse (Code.Length >= 18 AndAlso Code(17) <> "-"c)) Then
+            Code = Code.Substring(0, 17) & "-0105E"
+        End If
+        Return Code
+    End Function
 
     '自动加入
 
@@ -280,8 +300,9 @@ Public Class PageLinkMain
         'UI 更新
         If IsServerSide Then
             LabFinishTitle.Text = "已创建房间"
-            LabFinishDesc.Text = $"把邀请码发给朋友，让大家加入房间吧！{vbCrLf}邀请码：{NetworkName}-{NetworkSecret}"
+            LabFinishDesc.Text = $"把邀请码发给朋友，让大家加入房间吧！{vbCrLf}邀请码：{GetInviteCode()}"
             BtnFinishExit.Text = "关闭"
+            BtnFinishPing.ToolTip = "网络延迟"
             BtnFinishCopy.Visibility = Visibility.Visible
             Copy() '立即复制邀请码
             '下边栏
@@ -294,6 +315,7 @@ Public Class PageLinkMain
             LabFinishTitle.Text = "已加入房间"
             LabFinishDesc.Text = $"在多人游戏页面的最下方就能找到联机房间！{vbCrLf}注意：使用离线登录时不要手动输入 IP！"
             BtnFinishExit.Text = "离开"
+            BtnFinishPing.ToolTip = "与房主的延迟"
             BtnFinishCopy.Visibility = Visibility.Collapsed
             '下边栏
             BtnFinishPort.Visibility = Visibility.Collapsed
@@ -332,11 +354,15 @@ Public Class PageLinkMain
 
     '复制邀请码
     Private Sub Copy() Handles BtnFinishCopy.Click
-        Dim CodeText As String = $"在 PCL 启动器中输入邀请码【{NetworkName}-{NetworkSecret}】，即可加入联机房间！"
+        Dim CodeText As String = $"在 PCL 启动器中输入邀请码【{GetInviteCode()}】，即可加入联机房间！"
         ClipboardSet(CodeText, False)
         Setup.Set("LinkLastAutoJoinInviteCode", CodeText)
         Hint("已复制邀请码！", HintType.Green)
     End Sub
+    Private Function GetInviteCode() As String
+        Return $"{NetworkName}-{NetworkSecret}-{INVITE_CODE_VERSION.ToString.PadLeft(2, "0"c)}{ _
+            RadixConvert(If(DiscoverNodeID = -1, 0, DiscoverNodeID), 10, 16).PadLeft(3, "0"c)}"
+    End Function
 
     '复制 IP
     Private Sub BtnFinishIp_MouseLeftButtonUp(sender As Object, e As MouseButtonEventArgs) Handles BtnFinishIp.MouseLeftButtonUp
@@ -376,6 +402,11 @@ Public Class PageLinkMain
     ''' </summary>
     Private ClientAddress As String = Nothing
     ''' <summary>
+    ''' 发现节点的 ID。
+    ''' 若必须设定自定义节点则为 -2；若等待选择则为 -1；选择回退节点则为 0；否则为对应节点的 ID。
+    ''' </summary>
+    Private DiscoverNodeID As Integer = -1
+    ''' <summary>
     ''' 网络信息。
     ''' </summary>
     Private NetworkName As String, NetworkSecret As String
@@ -383,7 +414,7 @@ Public Class PageLinkMain
 #Region "加载"
 
     Private WithEvents LinkLoader As New LoaderCombo(Of Integer)("联机", {
-        New LoaderTask(Of Integer, Integer)("获取配置", AddressOf InitConfig) With {.Block = False, .ProgressWeight = 8},
+        New LoaderTask(Of Integer, Integer)("获取配置", AddressOf InitConfig) With {.ProgressWeight = 8},
         New LoaderTask(Of Integer, List(Of NetFile))("准备下载联机模块", AddressOf InitPrepareDownload) With {.ProgressWeight = 2},
         New LoaderDownload("下载联机模块", New List(Of NetFile)) With {.ProgressWeight = 40},
         New LoaderTask(Of Integer, Integer)("启动联机模块", AddressOf InitLaunch) With {.ProgressWeight = 50}
@@ -397,8 +428,12 @@ Public Class PageLinkMain
         End If
         ServerLoader.WaitForExit(LoaderToSyncProgress:=Task)
         If ServerConfig Is Nothing Then Throw New Exception("无法从服务器获取配置")
-        If Not String.IsNullOrEmpty(ServerConfig("Link")("DisableReason")) Then '检查是否已禁用联机功能
-            Throw New Exception("$" & ServerConfig("Link")("DisableReason").ToString)
+        '检查是否已禁用联机功能
+        Dim DisableReason = ServerConfig("Link")?("DisableReason2")?.ToString
+        If Not String.IsNullOrEmpty(DisableReason) Then Throw New Exception("$" & DisableReason)
+        If CType(ServerConfig("Link"), JObject).ContainsKey("MinVersionCode") AndAlso
+           VersionCode < ServerConfig("Link")("MinVersionCode").ToObject(Of Integer) Then
+            Throw New Exception("$你的 PCL 版本太老了，请在更新 PCL 之后再联机！")
         End If
     End Sub
 
@@ -443,7 +478,6 @@ Public Class PageLinkMain
     End Sub
 
     '3. 启动联机模块
-    Private Shared HostName As String
     Private Sub InitLaunch(Task As LoaderTask(Of Integer, Integer))
         '解压文件
         UpdateLoadingPage("正在解压联机模块……", "解压联机模块")
@@ -466,13 +500,19 @@ Public Class PageLinkMain
         End If
         Task.Progress = 0.07
         '获取节点列表
-        Dim Peers As List(Of String)
+        UpdateLoadingPage("正在获取节点列表……", "获取节点列表")
+        Dim RawPeers As List(Of String)
         Dim CustomPeers As String = Setup.Get("LinkCustomPeer")
         If String.IsNullOrWhiteSpace(CustomPeers) Then
-            Peers = GetOnlinePeers()
+            If DiscoverNodeID = -2 AndAlso Not IsServerSide Then
+                Panic("未填写自定义节点设置", $"$你必须在 {vbLQ}自定义节点{vbRQ} 设置中填写与房主相同的内容，{vbCrLf}才能进入该房间！")
+                Return
+            End If
+            RawPeers = GetTargetPeers()
         Else
-            Peers = CustomPeers.Split("，,".ToCharArray).Select(Function(p) p.Trim).Where(Function(p) Not String.IsNullOrEmpty(p)).ToList()
-            Log("[Link] 使用自定义节点")
+            If DiscoverNodeID <> -2 AndAlso Not IsServerSide Then Hint("房主可能没有使用自定义节点设置，请确认你们的自定义节点设置是否一致！")
+            RawPeers = CustomPeers.Split("，,".ToCharArray).Select(Function(p) p.Trim).Where(Function(p) Not String.IsNullOrEmpty(p)).ToList()
+            Log("[Link] 使用自定义节点：" & CustomPeers)
         End If
         Task.Progress = 0.13
         '获取空闲端口
@@ -484,7 +524,7 @@ Public Class PageLinkMain
         '获取启动参数
         Dim Arguments As String = ServerConfig("Link")("Argument")
         Arguments += $" --network-name={NetworkName} --network-secret={NetworkSecret} --listeners {ListenersPort} --rpc-portal {RPCPort}"
-        HostName = If(IsServerSide, "Server-", "Client-") & RadixConvert(Math.Abs(Identify.GetHashCode), 10, 36)
+        Dim HostName = If(IsServerSide, "Server-", "Client-") & RadixConvert(Math.Abs(Identify.GetHashCode), 10, 36)
         If IsServerSide Then
             Arguments += $" -i 10.114.114.114 --hostname={HostName} --tcp-whitelist={ServerPort} --udp-whitelist={ServerPort}"
         Else
@@ -496,10 +536,11 @@ Public Class PageLinkMain
             Arguments += $" --port-forward tcp://{IPAddress.Loopback}:{ClientPort}/10.114.114.114:{ServerPort}"
             Arguments += $" --port-forward udp://{IPAddress.Loopback}:{ClientPort}/10.114.114.114:{ServerPort}"
         End If
-        For Each Peer As String In Peers
+        For Each Peer As String In RawPeers
             Arguments += $" -p=""{Peer}"""
         Next
         Arguments += " --private-mode true" '老好人模式现在莫得用：If Not Setup.Get("LinkShareMode") Then
+        If Setup.Get("LinkLatencyMode") = 1 Then Arguments += " --latency-first"
         '启动进程
         ProcessStart(Arguments)
         Task.Progress = 0.15
@@ -512,23 +553,23 @@ Public Class PageLinkMain
             RefreshPeerLoader.WaitForExit(IsForceRestart:=True)
             '查找目标节点
             Dim Ping = GetPeerPing()
-            If Ping <> 0 Then
+            If Ping > 0 Then
                 Log($"[Link] 已与目标建立连接，当前 Ping 为 {Ping:0.0}ms")
-                Telemetry("联机成功", "Server", IsServerSide, "Ping", Ping)
+                Telemetry("联机成功", "Server", IsServerSide, "NAT", NATType)
                 Exit Do '退出循环
             End If
             '更新进度
             Dim LastProgress = Task.Progress
-            Dim PeerCount As Integer = If(Peers Is Nothing, -1, Peers.Count)
+            Dim PeerCount As Integer = If(Peers Is Nothing, -1, Peers.Where(Function(p) p.Ping > 0).Count)
             Select Case PeerCount
                 Case -1 'CLI 无返回
                     Task.Progress = MathClamp(Task.Progress + 0.02, 0.15, 0.25)
                 Case 0 'CLI 有返回，但未连接到任何节点
                     UpdateLoadingPage("正在连接到节点……", "连接节点")
-                    Task.Progress = MathClamp(Task.Progress + 0.02, If(IsServerSide, 0.5, 0.3), If(IsServerSide, 0.99, 0.5))
+                    Task.Progress = MathClamp(Task.Progress + 0.02, If(IsServerSide, 0.5, 0.3), If(IsServerSide, 0.95, 0.5))
                 Case Else '已连接到节点，但未连接到房主
                     UpdateLoadingPage("正在连接到房主……", "连接房主")
-                    Task.Progress = MathClamp(Task.Progress + 0.02, Math.Min(0.45 + PeerCount * 0.05, 0.65), 0.99)
+                    Task.Progress = MathClamp(Task.Progress + 0.02, Math.Min(0.45 + PeerCount * 0.05, 0.65), 0.95)
             End Select
             '超时判定
             If LastProgress <> Task.Progress Then
@@ -547,49 +588,112 @@ Public Class PageLinkMain
             End If
         Loop Until Task.IsAborted
         If Task.IsAborted Then Throw New ThreadInterruptedException
+        '等待连接稳定，最多 5s
+        If IsServerSide Then Return
+        UpdateLoadingPage("连接优化中……", "优化连接")
+        Task.Progress = 0.999
+        For i = 1 To 50
+            Dim Server = GetTargetPeer()
+            If Server IsNot Nothing AndAlso Not Server.Relay AndAlso Server.Ping < 100 Then Return '结束
+            If Task.IsAborted Then Throw New ThreadInterruptedException
+            Thread.Sleep(100)
+        Next
     End Sub
     ''' <summary>
-    ''' 从在线配置和 API 获取节点列表。
+    ''' 从在线配置和 API 获取需要连接的节点列表，并更新发现节点 ID。
+    ''' 根据发现节点 ID，会有以下行为变化：
+    '''   -1：作为房主，根据负载均衡选择一个发现节点。
+    '''   0：作为加入者，但邀请码未提供发现节点 ID，使用回退发现节点。
+    '''   >0：作为加入者，根据 ID 选择对应的发现节点；如果没有，使用回退发现节点。
     ''' </summary>
-    Private Function GetOnlinePeers() As List(Of String)
-        Dim Peers As List(Of String) = ServerConfig("Link")("Peers").Select(Function(p) p.ToString).ToList()
+    Private Function GetTargetPeers() As List(Of String)
+        Dim FinalPeers As New List(Of String), FinalDiscoverID As Integer = -1
+        Dim FallbackDiscoverID = ServerConfig("Link")("DiscoverPeerId").ToObject(Of Integer)
+        Dim FallbackDiscoverAddress As String = ServerConfig("Link")("DiscoverPeer").ToString()
         Try
             '从 API 获取节点列表
-            Dim BlackList As List(Of String) = ServerConfig("Link")("PeersBlackList").Select(Function(p) p.ToString).ToList() '黑名单
-            Dim CentralNodes As New List(Of String)
-            Dim RandomNodes As New List(Of Tuple(Of String, Double))
-            For Each Node As JObject In CType(GetJson(NetRequestByClientRetry("https://uptime.easytier.cn/api/nodes?page=1&per_page=200")), JObject)("data")("items")
+            Dim RawNodes As JObject
+            Dim IsFallbackRawList As Boolean = False
+            Try
+                RawNodes = GetJson(NetRequestByClient("https://uptime.easytier.cn/api/nodes?page=1&per_page=1000", RequireJson:=True))
+            Catch exx As Exception
+                Log(exx, "从源站获取节点列表失败，将使用 CDN 缓存")
+                RawNodes = GetJson(NetRequestByClientRetry("https://easytier.meloong.com/?page=1&per_page=1000", RequireJson:=True))
+                IsFallbackRawList = True
+            End Try
+            '分析节点列表
+            Dim Nodes As New List(Of JObject) '负载会添加在 load 字段上
+            Dim BlackList As List(Of String) = ServerConfig("Link")("PeersBlackList").Select(Function(p) p.ToString).ToList()
+            For Each Node As JObject In RawNodes("data")("items")
                 '状态检查
-                If Node("protocol").ToString <> "tcp" Then Continue For
-                If Node("current_health_status").ToString <> "healthy" Then Continue For
-                If Not Node("is_active").ToObject(Of Boolean) Then Continue For
-                If Not Node("is_approved").ToObject(Of Boolean) Then Continue For
+                Dim ID = Node("id").ToObject(Of Integer)
+                If Not Node("is_active").ToObject(Of Boolean) OrElse Not Node("is_approved").ToObject(Of Boolean) Then Continue For
+                If ID = DiscoverNodeID Then GoTo ForcedPass '若为指定的发现节点，忽略后续检查
+                If ID = FallbackDiscoverID Then Continue For '不主动选取回退发现节点
+                If BlackList.Contains(Node("address").ToString) Then Continue For 'ServerConfig 黑名单
+                If Node("usage_percentage").ToObject(Of Double) = 0 AndAlso RandomInteger(1, 100) <> 1 Then Continue For '或许节点有问题才导致是 0 负载，让它只有 1% 概率被选中
+                '标签检查
                 Dim Tags = Node("tags").Select(Function(t) t.ToString).ToList
-                If Not Tags.Contains("国内") Then Continue For
-                If Tags.Contains("即将下线") Then Continue For
-                Dim Address As String = Node("address").ToString
-                If BlackList.Contains(Address) Then Continue For
-                '添加节点
-                If Tags.Contains("MC") Then
-                    CentralNodes.Add(Address)
-                Else
-                    If Not Node("allow_relay").ToObject(Of Boolean) Then Continue For
-                    If Node("usage_percentage").ToObject(Of Double) = 0 Then Continue For '或许节点有问题才导致是 0 负载
-                    RandomNodes.Add(New Tuple(Of String, Double)(
-                        Address,
-                        Node("usage_percentage").ToObject(Of Double) * (103 - Node("health_percentage_24h").ToObject(Of Double)))) '负载，越低越好
-                End If
+                If Not Tags.Contains("国内") OrElse Not Tags.Contains("MC中继") Then Continue For
+                '计算负载并加入列表
+ForcedPass:
+                Dim Load As Double = Node("usage_percentage").ToObject(Of Double) '负载
+                Load *= 110 - Node("health_percentage_24h").ToObject(Of Double) '可用率
+                Node("load") = Load
+                Nodes.Add(Node)
             Next
-            RandomNodes = RandomNodes.OrderBy(Function(n) n.Item2).ToList()
-            Log($"[Link] 获取到 {CentralNodes.Count} 个中心节点，{RandomNodes.Count} 个随机节点")
-            '选择节点
-            Dim RandomCount As Integer = ServerConfig("Link")("RandomPeer").ToObject(Of Integer)
-            If RandomNodes.Count < RandomCount Then Throw New Exception($"可用的随机节点数量不足，需要 {RandomCount} 个，实际 {RandomNodes.Count} 个")
-            Peers = CentralNodes.Concat(RandomNodes.Take(RandomCount).Select(Function(n) n.Item1)).ToList()
+            '排序
+            If Not IsFallbackRawList Then
+                Nodes = Nodes.OrderBy(Function(n) n("load").ToObject(Of Double)).ToList() '按负载从低到高排序
+            Else
+                Nodes = Nodes.Shuffle().ToList() '回退到 CDN 缓存时，由于负载数据可能过期，直接随机选择
+            End If
+            '选取发现节点
+            Dim SelectedDiscoverNode As JObject = Nothing
+            If DiscoverNodeID = -1 Then '-1：作为房主，根据负载均衡选择一个发现节点
+                SelectedDiscoverNode = Nodes.FirstOrDefault(Function(n) Not n("allow_relay").ToObject(Of Boolean))
+            ElseIf DiscoverNodeID > 0 Then '>0：作为加入者，根据 ID 选择对应的发现节点；如果没有，使用回退发现节点
+                SelectedDiscoverNode = Nodes.FirstOrDefault(Function(n) n("id").ToObject(Of Integer) = DiscoverNodeID)
+                If SelectedDiscoverNode Is Nothing Then
+                    Log($"[Link] 未找到 ID {DiscoverNodeID} 的发现节点", LogLevel.Debug)
+                    Panic("房间已过期", "请让房主重新创建房间！")
+                    Throw New ThreadInterruptedException
+                End If
+            End If
+            If SelectedDiscoverNode Is Nothing Then '使用回退发现节点
+                SelectedDiscoverNode = New JObject From {{"address", FallbackDiscoverAddress}, {"id", FallbackDiscoverID}}
+                Log("[Link] 将使用回退发现节点", LogLevel.Debug)
+            End If
+            FinalPeers.Add(SelectedDiscoverNode("address").ToString())
+            FinalDiscoverID = SelectedDiscoverNode("id").ToObject(Of Integer)
+            Log($"[Link] 发现节点：{SelectedDiscoverNode("address")} (ID: {FinalDiscoverID})")
+            '选取中继节点
+            If ModeDebug OrElse Not IsServerSide Then '房主只连接发现节点，不连接中继节点
+                Dim RelayCount As Integer = ServerConfig("Link")("RandomPeer").ToObject(Of Integer)
+                Dim RelayNodes = Nodes.Where(Function(n) n("allow_relay").ToObject(Of Boolean)).ToList()
+                If RelayNodes.Count < RelayCount Then Throw New Exception($"可用的中继节点数量不足，需要 {RelayCount} 个，实际 {RelayNodes.Count} 个")
+                FinalPeers.AddRange(RelayNodes.Take(RelayCount).Select(Function(n) n("address").ToString()))
+            End If
+        Catch ex As ThreadInterruptedException
+            Throw
         Catch ex As Exception
             Log(ex, "获取节点列表失败，联机质量可能受到影响", LogLevel.Hint)
+            FinalPeers.AddRange(ServerConfig("Link")("Peers").Select(Function(p) p.ToString))
+            If FinalDiscoverID <= 0 Then
+                FinalPeers.Add(FallbackDiscoverAddress)
+                FinalDiscoverID = FallbackDiscoverID
+            End If
         End Try
-        Return Peers
+        '版本 1 兼容
+        If CType(ServerConfig("Link"), JObject).ContainsKey("EnableForcedPeer") Then
+            FinalPeers.Add("tcp://mc1.easytier.cn:55558")
+            If FinalDiscoverID <= 0 Then FinalDiscoverID = 94
+        End If
+        '强制添加的节点
+        FinalPeers.AddRange(ServerConfig("Link")("MandatoryPeers").Select(Function(p) p.ToString))
+        '结束
+        DiscoverNodeID = FinalDiscoverID
+        Return FinalPeers.Distinct.ToList
     End Function
 
 #End Region
@@ -638,6 +742,11 @@ Public Class PageLinkMain
     ''' 出现意外错误，给出错误信息并结束联机。
     ''' </summary>
     Private Sub Panic(Brief As String, Detail As String)
+        '常见原因分析
+        If Detail.Contains("failed to listen on ") Then
+            Detail = $"监听端口失败。{vbCrLf}请点击重试，如果还是出现此错误，可以重启电脑解决。{vbCrLf}{vbCrLf}{Detail}"
+        End If
+        '显示信息
         If LinkState = LinkStates.Loading Then
             FailReason = Brief
             LinkLoader.Failed(New Exception(Detail))
@@ -739,9 +848,13 @@ Public Class PageLinkMain
         ''' </summary>
         Public ReadOnly Name As String
         ''' <summary>
-        ''' 连接方式。
+        ''' 是否通过中继连接。
         ''' </summary>
-        Public ReadOnly Cost As String
+        Public ReadOnly Relay As Boolean
+        ''' <summary>
+        ''' NAT 类型。
+        ''' </summary>
+        Public ReadOnly NATType As NATTypes
 
         ''' <summary>
         ''' 从 CLI 给出的信息分析对应的数据。
@@ -749,7 +862,7 @@ Public Class PageLinkMain
         Public Sub New(Info As JObject)
             '类别
             Dim PeerName = Info("hostname").ToString
-            If PeerName = HostName Then
+            If Info("cost").ToString = "Local" Then
                 Type = Types.Self
             ElseIf PeerName.StartsWithF("Client") Then
                 Type = Types.Client
@@ -759,20 +872,42 @@ Public Class PageLinkMain
                 Type = Types.Misc
             End If
             '基础信息
-            Ping = If(Info("lat_ms").ToString = "-", 0, Info("lat_ms").ToString)
+            Double.TryParse(Info("lat_ms"), NumberStyles.Any, CultureInfo.InvariantCulture, Ping)
             Name = PeerName
-            Cost = Info("cost")
+            Relay = Info("cost").ToString.ContainsF("relay", True)
+            NATType = Info("nat_type").ToString.ParseToEnum(Of NATTypes)
         End Sub
         Public Overrides Function ToString() As String
-            Return $"{Type} - {Name} - Ping {Ping:0.0}ms [{Cost}]"
+            Return $"{Type} - {Name} - Ping {Ping:0.0}ms [中继? {Relay}] - NAT {NATType}"
         End Function
     End Class
+    Private Enum NATTypes
+        'https://github.com/EasyTier/EasyTier/blob/6bb2fd9a15ab2499bdeabdcc3a925e9bd9aebf50/easytier/src/proto/common.proto#L129
+        Unknown = 0
+        OpenInternet = 1
+        NoPAT = 2
+        FullCone = 3
+        Restricted = 4
+        PortRestricted = 5
+        Symmetric = 6
+        SymUdpFirewall = 7
+        SymmetricEasyInc = 8
+        SymmetricEasyDec = 9
+        ''' <summary>
+        ''' 尚未获取。
+        ''' </summary>
+        Pending = 10
+    End Enum
 
     ''' <summary>
     ''' 当前的节点列表，使用 RefreshPeerLoader 来刷新。
     ''' 若尚未成功获取过则为 Nothing，但保证在加载完成后至少是一个列表。
     ''' </summary>
     Private Peers As List(Of Peer) = Nothing
+    ''' <summary>
+    ''' 自己的 NAT 类型。
+    ''' </summary>
+    Private NATType As NATTypes = NATTypes.Pending
 
     ''' <summary>
     ''' 调用 EasyTier CLI 获取已连接节点信息。
@@ -781,25 +916,22 @@ Public Class PageLinkMain
     ''' </summary>
     Private RefreshPeerLoader As New LoaderTask(Of Integer, List(Of Peer))("EasyTier CLI", AddressOf RefreshPeer)
     Private Sub RefreshPeer()
-        '| ipv4              | hostname              | cost     | lat(ms) | loss | rx      | tx      | tunnel | NAT            | version        |
-        '|-------------------|-----------------------|----------|---------|------|---------|---------|--------|----------------|----------------|
-        '| 10.114.114.1/24   | Client-RJ458A         | Local    | -       | -    | -       | -       | -      | Unknown        | 2.4.5-4c4d172e |
-        '|                   | PublicServer_公用服务器  | p2p      | 48.40   | 0.0% | 875 B   | 1.26 kB | tcp    | NoPat          | 2.4.5-4c4d172e |
-        '| 10.114.114.114/24 | Server-J6P6IW         | p2p      | 5.63    | 0.0% | 1.65 kB | 1.64 kB | udp    | PortRestricted | 2.4.5-4c4d172e |
-        '| 10.114.114.114/24 | Server-J6PHIW (连接中) | relay(2) | 1000.00 | 0.0% | 0 B     | 0 B     |        | PortRestricted | 2.4.5-4c4d172e |
         Try
             Dim CliResult = StartProcessAndGetOutput(PathEasyTier & "联机模块 CLI.exe", $"-o json -p 127.0.0.1:{RPCPort} peer", 2000, Encoding:=Encoding.UTF8, PrintLog:=False)
             '解析
             If Not CliResult.Contains("lat_ms") Then Throw New Exception("CLI 调用失败：" & vbCrLf & CliResult)
             If GetUuid() Mod If(ModeDebug, 23, 103) = 0 Then Log("[EasyTier] CLI 输出抽样：" & vbCrLf & CliResult)
             Dim NewPeers As New List(Of Peer)
-            For Each Line As JObject In CType(GetJson(CliResult), JArray).Skip(1)
+            For Each Line As JObject In CType(GetJson(CliResult), JArray)
                 Try
                     Dim Peer = New Peer(Line)
-                    If Peer.Type = Peer.Types.Self Then Continue For '自己
-                    NewPeers.Add(Peer)
+                    If Peer.Type = Peer.Types.Self Then
+                        NATType = Peer.NATType '记录自己的 NAT
+                    Else
+                        NewPeers.Add(Peer)
+                    End If
                 Catch exx As Exception
-                    Log(exx, $"错误的信息行（{Line}）")
+                    Log(exx, $"错误的信息（{Line}）")
                 End Try
             Next
             '完成
@@ -829,7 +961,7 @@ Public Class PageLinkMain
         Return Peer.Ping
     End Function
     ''' <summary>
-    ''' 服务端会返回所有节点中 Ping 的那一个，客户端会返回服务端。
+    ''' 服务端会返回所有节点中 Ping 大于 0 最低的那一个，客户端会返回服务端。
     ''' 若没有则为 Nothing。
     ''' </summary>
     Private Function GetTargetPeer() As Peer
@@ -841,7 +973,7 @@ Public Class PageLinkMain
             Targets = Peers.Where(Function(p) p.Type = Peer.Types.Server AndAlso p.Ping > 0)
         End If
         If Not Targets.Any Then Return Nothing
-        '返回 Ping 大于 0 且最低的那个
+        '返回 Ping 且最低的那个
         Dim MinPing = Targets.Min(Function(p) p.Ping)
         Return Targets.First(Function(p) p.Ping = MinPing)
     End Function
@@ -862,8 +994,8 @@ Public Class PageLinkMain
 #Region "定时任务"
 
     '启动
-    Private IsTimerStarted As Boolean = False
     Private Sub StartTimerThread() Handles Me.Loaded
+        Static IsTimerStarted As Boolean = False
         If IsTimerStarted Then Return
         RunInNewThread(
         Sub()
@@ -888,38 +1020,66 @@ Public Class PageLinkMain
     End Sub
 
     '每秒或进入页面时触发
-    Private BroadcastSocket As New Socket(SocketType.Dgram, ProtocolType.Udp)
     Private Sub Update() Handles Me.Loaded
         If LinkState <> LinkStates.Finished Then Return
         '重新获取信息
         SyncLock RefreshPeerLoader.LockState
             If RefreshPeerLoader.State <> LoadState.Loading Then RefreshPeerLoader.Start(IsForceRestart:=True)
         End SyncLock
-        '更新 Ping 与人数显示
+        '更新 UI
         If FrmMain.PageCurrent = FormMain.PageType.Link Then
             RunInUi(
             Sub()
+                'Logo 旋转动画
+                AniStart(AaRotateTransform(ImgFinishLogo, 500, 5000), "Link Logo Rotation")
+                'Ping
                 Dim Ping As Double = GetPeerPing()
-                Dim RelayLayer As Integer = If(GetTargetPeer().Cost.RegexSeek("(?<=relay\()\d+") Is Nothing,
-                    0, Val(GetTargetPeer().Cost.RegexSeek("(?<=relay\()\d+")) - 1)
-                '更新 Ping 显示
-                If Ping Mod 500 = 0 OrElse $"{Ping:0.0}" = "1.0" OrElse FailCount > 0 Then
-                    LabFinishPing.Text = "连接中"
-                    AniStop("Link Logo Rotation")
+                Dim Connecting As Boolean = Ping Mod 500 = 0 OrElse $"{Ping:0.0}" = "1.0" OrElse FailCount > 0
+                If Connecting Then
+                    LabFinishPing.Text = "连接优化中"
                 Else
-                    LabFinishPing.Text =
-                        If(RelayLayer > 0, If(RelayLayer > 1, $"中继 {RelayLayer} · ", "中继 · "), "") & '使用中继连接时显示 “中继” 前缀
-                        If(Ping >= 10, $"{Ping:0} ms", $"{Ping:0.0} ms")
-                    AniStart(AaRotateTransform(ImgFinishLogo, 500, 5000), "Link Logo Rotation") 'Logo 旋转动画
+                    LabFinishPing.Text = If(Ping >= 10, $"{Ping:0} ms", $"{Ping:0.0} ms")
                 End If
-                '更新 Ping 的 Tooltip 显示
-                Dim Tooltip As String = If(IsServerSide, "网络延迟", "与房主的延迟")
-                If RelayLayer Then Tooltip &= If(IsServerSide,
-                    $"（你的网络环境较差，正经过 {RelayLayer} 层中继，可能会有点卡）",
-                    $"（你或者房主的网络环境较差，正经过 {RelayLayer} 层中继，可能会有点卡）")
-                BtnFinishPing.ToolTip = Tooltip
-                '更新人数显示
+                '人数显示
                 LabFinishPlayer.Text = PeopleCount & "  人"
+                '------------------------
+                '  提示条
+                '------------------------
+                HintFinish.Visibility = Visibility.Collapsed
+                If IsServerSide Then Return '服务端没有需要显示的提示
+                If Connecting Then Return '连接稳定过程中不显示提示
+                '中继提示
+                Dim Server As Peer = GetTargetPeer()
+                If Server Is Nothing Then Return
+                If Server.Relay Then
+                    If NATType >= NATTypes.Symmetric AndAlso Server.NATType >= NATTypes.Symmetric Then
+                        HintFinish.Text = "你和房主的网络环境都不太好，"
+                    ElseIf NATType >= NATTypes.Symmetric Then
+                        HintFinish.Text = "你的网络环境不太好，"
+                    ElseIf Server.NATType >= NATTypes.Symmetric Then
+                        HintFinish.Text = "房主的网络环境不太好，"
+                    Else
+                        HintFinish.Text = "你或者房主的网络环境不太好，"
+                    End If
+                    If String.IsNullOrWhiteSpace(Setup.Get("LinkCustomPeer")) Then
+                        HintFinish.Text &= "正使用社区节点进行中继。"
+                    Else
+                        HintFinish.Text &= "正通过自定义节点进行中继。"
+                    End If
+                    HintFinish.Visibility = Visibility.Visible
+                    HintFinish.Theme = MyHint.Themes.Yellow
+                    Return
+                End If
+                '环境比房主更好的提示
+                If NATType >= NATTypes.PortRestricted Then Return '自身的 NAT 为 2 或更好
+                If Server.NATType < NATTypes.PortRestricted Then Return '房主的 NAT 为 3 或更差
+                Dim OtherPlayers = Peers.Where(Function(p) p.Type = Peer.Types.Client).ToList()
+                If Not OtherPlayers.Any() Then Return '房间里还有其他玩家
+                If OtherPlayers.Any(Function(p) p.Relay) Then Return '自己可以与所有玩家打洞
+                If OtherPlayers.All(Function(p) p.NATType < NATTypes.PortRestricted) Then Return '任意其他玩家的 NAT 为 3 或更差
+                HintFinish.Visibility = Visibility.Visible
+                HintFinish.Theme = MyHint.Themes.Blue
+                HintFinish.Text = "你的网络环境比房主更好！如果你来当房主，其他玩家或许能更加流畅！"
             End Sub)
         End If
         '检查核心状态
@@ -937,6 +1097,7 @@ Public Class PageLinkMain
         '广播联机房间端口
         If Not IsServerSide Then
             Try
+                Static BroadcastSocket As New Socket(SocketType.Dgram, ProtocolType.Udp)
                 BroadcastSocket.SendTo(
                     Encoding.UTF8.GetBytes($"[MOTD]PCL 联机房间[/MOTD][AD]{ClientPort}[/AD]"),
                     SocketFlags.None,