我在使用我的 Android 应用程序中的 TCPDump 时遇到问题。它应该逐行读取 tcpdump 的输出并在我的应用程序中处理它。
问题是:
有时代码运行良好,它会立即读取捕获的数据包。但有时,ReadLine 会阻塞,直到我从 Linux 控制台终止 tcpdump 进程(killall tcpdump)。之后,我的循环会针对每一行进行处理(有时是 10 行,有时是 1 或 2 行)——这意味着 readLine 应该可以工作,但没有。
我读到了类似的问题,但没有找到任何解决这个问题的方法......
谢谢!
public class ListenActivity extends Activity {
static ArrayList<Packet> packetBuffer = new ArrayList<Packet>();
static Process tcpDumpProcess = null;
static ListenThread thread = null;
public static final String TCPDUMP_COMMAND = "tcpdump -A -s0 | grep -i -e 'Cookie'\n";
private InputStream inputStream = null;
private OutputStream outputStream = null;
@Override
protected void onStart() {
super.onStart();
try {
tcpDumpProcess = new ProcessBuilder().command("su").redirectErrorStream(true).start();
inputStream = tcpDumpProcess.getInputStream();
outputStream = tcpDumpProcess.getOutputStream();
outputStream.write(TCPDUMP_COMMAND.getBytes("ASCII"));
} catch (Exception e) {
Log.e("FSE", "", e);
}
thread = new ListenThread(new BufferedReader(new InputStreamReader(inputStream)));
thread.start();
}
private class ListenThread extends Thread {
public ListenThread(BufferedReader reader) {
this.reader = reader;
}
private BufferedReader reader = null;
@Override
public void run() {
reader = new BufferedReader(new InputStreamReader(inputStream));
while (true) {
try {
String received = reader.readLine();
Log.d("FS", received);
Packet pReceived = Packet.analyze(received);
if (pReceived != null) {
packetBuffer.add(pReceived);
}
} catch (Exception e) {
Log.e("FSE", "", e);
}
}
}
}
}