CtsSecurityTestCases#ListeningPortsTest定位tcp端口与pid

ctssecuritytestcases#listeningportstest定位tcp端口与pid

【问题描述】

cts失败项
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)

【问题结论】

定位到subtitle端口监听某次提交，回退后测试pass

authblog：秋城

【分析详细】

1.定位节点inode
port=10100是十进制，/proc/net/tcp中port是十六进制，做一下转换10110-->2774,见下面2:处，对应inode为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.根据inode查找pid
进入/proc/[pid]/fd/目录下ls -l 查看socket端口号，由于我们不知道在哪个pid目录下，所以遍历一下
sh脚本或者终端输入shell命令for循环遍历查找32905节点的pid：

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

结果查找到pid为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对应的程序

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

至此定位结束，反馈给相应模块处理

【参考资料】

1.嵌入式设备上如何通过端口号定位到进程

2.获取tcp/udp端口对应的进程pid
https://blog.csdn.net/chrisniu1984/article/details/7022745