CtsSecurityTestCases#ListeningPortsTest定位tcp端口與pid

CtsSecurityTestCases#ListeningPortsTest定位tcp端口與pid

【問題描述】

cts失敗項
armeabi-v7a CtsSecurityTestCases
android.security.cts.ListeningPortsTest#testNoListeningLoopbackTcpPorts
工具：9.0_r11

05-06 17:11:28.649 17375 17391 E TestRunner: android.security.cts.ListeningPortsTest$ListeningPortsAssertionError: 
05-06 17:11:28.649 17375 17391 E TestRunner: Found port listening on addr=127.0.0.1, port=10100, UID=1000 [com.android.keychain, com.itv.android.iptv, com.android.location.fused, com.android.providers.settings,com.launcher.idn, android, com.itv.android.iptv.tvclient,com.droidlogic, com.android.wallpaperbackup, com.droidlogic.BluetoothRemote, ] in /proc/net/tcp
05-06 17:11:28.649 17375 17391 E TestRunner: 	at android.security.cts.ListeningPortsTest.assertNoAccessibleListeningPorts(ListeningPortsTest.java:250)
05-06 17:11:28.649 17375 17391 E TestRunner: 	at android.security.cts.ListeningPortsTest.testNoListeningLoopbackTcpPorts(ListeningPortsTest.java:138)

【問題結論】

定位到subtitle端口監聽某次提交，回退後測試pass

AuthBlog：秋城https://www.cnblogs.com/houser0323

【分析詳細】

1.定位節點inode
port=10100是十進制，/proc/net/tcp中port是十六進制，作一下轉換10110-->2774,見下面2:處，對應inode爲32905。

console:/ # cat proc/net/tcp
  sl  local_address rem_address   st tx_queue rx_queue tr tm->when retrnsmt   uid  timeout inode
   0: 7632A8C0:EA60 00000000:0000 0A 00000000:00000000 00:00000000 00000000  1000        0 58215 1 00000000 100 0 0 10 0
   1: 00000000:1A85 00000000:0000 0A 00000000:00000000 00:00000000 00000000     0        0 33635 1 00000000 100 0 0 10 0
   2: 0100007F:2774 00000000:0000 0A 00000000:00000000 00:00000000 00000000  1000        0 32905 1 00000000 100 0 0 10 0

2.根據inode查找pid
進入/proc/[pid]/fd/目錄下ls -l 查看socket端口號，因爲咱們不知道在哪一個pid目錄下，因此遍歷一下
sh腳本或者終端輸入shell命令for循環遍歷查找32905節點的pid：

# for dir in `find /proc -name "fd" 2>/dev/null`
> do
> ls -l $dir | grep "socket\:\[32905\]" && echo $dir
> done

結果查找到pid爲4085

lrwx------ 1 root root 64 2020-05-07 11:03 46 -> socket:[32905]
/proc/4085/task/4085/fd
lrwx------ 1 root root 64 2020-05-07 11:03 46 -> socket:[32905]
/proc/4085/task/4094/fd
......
lrwx------ 1 root root 64 2020-05-07 10:47 46 -> socket:[32905]
/proc/4085/fd

3.查看pid對應的程序

console:/ # ps 4085
USER           PID  PPID     VSZ    RSS WCHAN            ADDR S NAME
system        4085  3024 1124392  82892 SyS_epoll_wait      0 S com.droidlogic.SubTitleService

至此定位結束，反饋給相應模塊處理

【參考資料】

1.嵌入式設備上如何經過端口號定位到進程
https://blog.csdn.net/daizhongyin/article/details/90031132

2.獲取tcp/udp端口對應的進程pid
https://blog.csdn.net/ChrisNiu1984/article/details/7022745