commit 9b1820103556df5eaaea89d1b3b6e565cd6709b9
author Chalard Jean <jchalard@google.com> Fri Feb 03 21:05:50 2023 +0900
committer Chalard Jean <jchalard@google.com> Mon Feb 06 18:04:03 2023 +0900
tree ab0626def70abf2062a9d94c8b3f97ccd3de2eab
parent c6d0770afc355e4828cde19a5a4a6f6f301a0927

Log when a TCP connection keeps up an auto keepalive

This shows the owner UID, the destination and the socket
cookie. The socket cookie can then be looked up in
dumpsys netstats to see what is the tag.

This is only logged if log level is at least debug for the
AutomaticOnOffKeepaliveTracker tag :
adb shell setprop log.tag.AutomaticOnOffKeepaliveTracker DEBUG

Test: manual
Change-Id: I54f3a99ab1483d50ee71cb158a54f67fe640b3fc

service/src/com/android/server/connectivity/AutomaticOnOffKeepaliveTracker.java

diff --git a/service/src/com/android/server/connectivity/AutomaticOnOffKeepaliveTracker.java b/service/src/com/android/server/connectivity/AutomaticOnOffKeepaliveTracker.java
index 18e2dd8..6ddbe4c 100644
--- a/service/src/com/android/server/connectivity/AutomaticOnOffKeepaliveTracker.java
+++ b/service/src/com/android/server/connectivity/AutomaticOnOffKeepaliveTracker.java
@@ -54,6 +54,7 @@
 import android.os.SystemClock;
 import android.system.ErrnoException;
 import android.system.Os;
+import android.system.OsConstants;
 import android.system.StructTimeval;
 import android.util.Log;
 import android.util.SparseArray;
@@ -67,6 +68,7 @@
 import com.android.net.module.util.HexDump;
 import com.android.net.module.util.SocketUtils;
 import com.android.net.module.util.netlink.InetDiagMessage;
+import com.android.net.module.util.netlink.NetlinkMessage;
 import com.android.net.module.util.netlink.NetlinkUtils;
 import com.android.net.module.util.netlink.StructNlAttr;
 
@@ -599,6 +601,16 @@
                     bytes.position(startPos + SOCKDIAG_MSG_HEADER_SIZE);
 
                     if (isTargetTcpSocket(bytes, nlmsgLen, networkMark, networkMask)) {
+                        if (Log.isLoggable(TAG, Log.DEBUG)) {
+                            bytes.position(startPos);
+                            final InetDiagMessage diagMsg = (InetDiagMessage) NetlinkMessage.parse(
+                                    bytes, OsConstants.NETLINK_INET_DIAG);
+                            Log.d(TAG, String.format("Found open TCP connection by uid %d to %s"
+                                            + " cookie %d",
+                                    diagMsg.inetDiagMsg.idiag_uid,
+                                    diagMsg.inetDiagMsg.id.remSocketAddress,
+                                    diagMsg.inetDiagMsg.id.cookie));
+                        }
                         return true;
                     }
                 }