diag(client/macos): 抓 sing-box urltest 内核日志,定位探测为何失败

确认 urltest 为空是内核探测 100% 失败(传输/读取链路均正常)。本次注入 log.level=debug,
StatsCollector 新增 Log 命令客户端,抓取内核日志里 urltest/gstatic 相关行(失败原因:
DNS/连接/超时),塞进 stats 的 klog 字段经主 app 可读日志透出 —— 直接看到内核报错。

CURRENT_PROJECT_VERSION 51→52。

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

client/macos/PacketTunnel/PacketTunnelProvider.swift

@@ -130,6 +130,11 @@ final class PacketTunnelProvider: NEPacketTunnelProvider {
             experimental["cache_file"] = ["enabled": true]
         }
         root["experimental"] = experimental
+        // 诊断:开 debug 日志,让 urltest 探测的失败原因(DNS/连接/超时)出现在内核日志里,
+        // 由 StatsCollector 的 Log 客户端抓取透出。
+        var logCfg = (root["log"] as? [String: Any]) ?? [:]
+        logCfg["level"] = "debug"
+        root["log"] = logCfg
         guard let data = try? JSONSerialization.data(withJSONObject: root),
               let out = String(data: data, encoding: .utf8) else { return configJSON }
         return out
@@ -374,6 +379,7 @@ private func simpleError(_ msg: String) -> NSError {
 final class StatsCollector: NSObject {
     private let queue = DispatchQueue(label: "pangolin.stats.collector")
     private var statusClient: LibboxCommandClient?
+    private var logClient: LibboxCommandClient?
     private var started = false
     private var clashTimer: DispatchSourceTimer?
 
@@ -396,23 +402,24 @@ final class StatsCollector: NSObject {
             guard let self, !self.started else { return }
             self.clashBase = "http://127.0.0.1:\(clashPort)"
             self.clashSecret = clashSecret
-            self.statusClient = self.connectStatusClient()
+            self.statusClient = self.connectCommand(LibboxCommandStatus, "status")
+            self.logClient = self.connectCommand(LibboxCommandLog, "log")  // 抓内核 urltest 报错
             self.started = true
             self.startClashTimer()
         }
     }
 
-    /// libbox Status client(取速率)。command.sock 刚建好可能稍滞后,重试。
-    private func connectStatusClient() -> LibboxCommandClient? {
+    /// 为单一命令开一个 libbox client 并连上。command.sock 刚建好可能稍滞后,重试。
+    private func connectCommand(_ command: Int32, _ label: String) -> LibboxCommandClient? {
         let options = LibboxCommandClientOptions()
         options.statusInterval = 1_000_000_000 // 1s
-        options.addCommand(LibboxCommandStatus)
+        options.addCommand(command)
         guard let c = LibboxNewCommandClient(self, options) else { return nil }
         for _ in 0..<20 {
-            do { try c.connect(); NSLog("[pangolin/collector] status connected"); return c }
+            do { try c.connect(); NSLog("[pangolin/collector] %@ connected", label); return c }
             catch { Thread.sleep(forTimeInterval: 0.25) }
         }
-        NSLog("[pangolin/collector] status gave up")
+        NSLog("[pangolin/collector] %@ gave up", label)
         return nil
     }
 
@@ -421,7 +428,9 @@ final class StatsCollector: NSObject {
             guard let self else { return }
             self.clashTimer?.cancel(); self.clashTimer = nil
             if let c = self.statusClient { try? c.disconnect() }
+            if let c = self.logClient { try? c.disconnect() }
             self.statusClient = nil
+            self.logClient = nil
             self.started = false
             self.lock.lock()
             self.latest = StatsCollector.zero
@@ -564,7 +573,19 @@ extension StatsCollector: LibboxCommandClientHandlerProtocol {
     func connected() {}
     func disconnected(_ message: String?) {}
     func clearLogs() {}
-    func writeLogs(_ messageList: (any LibboxLogIteratorProtocol)?) {}
+    func writeLogs(_ messageList: (any LibboxLogIteratorProtocol)?) {
+        guard let it = messageList else { return }
+        while it.hasNext() {
+            guard let entry = it.next() else { break }
+            let msg = entry.message
+            let low = msg.lowercased()
+            // 只抓 urltest 探测相关行(含失败原因:DNS/连接/超时)。
+            guard low.contains("urltest") || low.contains("url-test")
+                || low.contains("gstatic") || low.contains("generate_204") else { continue }
+            NSLog("[pangolin/klog] %@", msg)
+            lock.lock(); latest["klog"] = String(msg.prefix(180)); lock.unlock()
+        }
+    }
     func setDefaultLogLevel(_ level: Int32) {}
     func initializeClashMode(_ modeList: (any LibboxStringIteratorProtocol)?, currentMode: String?) {}
     func updateClashMode(_ newMode: String?) {}