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-rw-r--r--app/src/main/java/com/wireguard/android/util/RootShell.java186
1 files changed, 98 insertions, 88 deletions
diff --git a/app/src/main/java/com/wireguard/android/util/RootShell.java b/app/src/main/java/com/wireguard/android/util/RootShell.java
index 7fbafa33..9e487a31 100644
--- a/app/src/main/java/com/wireguard/android/util/RootShell.java
+++ b/app/src/main/java/com/wireguard/android/util/RootShell.java
@@ -31,6 +31,7 @@ public class RootShell {
private final String deviceNotRootedMessage;
private final File localBinaryDir;
private final File localTemporaryDir;
+ private final Object lock = new Object();
private final String preamble;
private Process process;
private BufferedReader stderr;
@@ -57,16 +58,18 @@ public class RootShell {
return false;
}
- public synchronized boolean isRunning() {
- try {
- // Throws an exception if the process hasn't finished yet.
- if (process != null)
- process.exitValue();
- } catch (final IllegalThreadStateException ignored) {
- // The existing process is still running.
- return true;
+ private boolean isRunning() {
+ synchronized (lock) {
+ try {
+ // Throws an exception if the process hasn't finished yet.
+ if (process != null)
+ process.exitValue();
+ return false;
+ } catch (final IllegalThreadStateException ignored) {
+ // The existing process is still running.
+ return true;
+ }
}
- return false;
}
/**
@@ -77,101 +80,108 @@ public class RootShell {
* @param command Command to run as root.
* @return The exit value of the command.
*/
- public synchronized int run(final Collection<String> output, final String command)
+ public int run(final Collection<String> output, final String command)
throws IOException, NoRootException {
- start();
- final String marker = UUID.randomUUID().toString();
- final String script = "echo " + marker + "; echo " + marker + " >&2; (" + command +
- "); ret=$?; echo " + marker + " $ret; echo " + marker + " $ret >&2\n";
- Log.v(TAG, "executing: " + command);
- stdin.write(script);
- stdin.flush();
- String line;
- int errnoStdout = Integer.MIN_VALUE;
- int errnoStderr = Integer.MAX_VALUE;
- int markersSeen = 0;
- while ((line = stdout.readLine()) != null) {
- if (line.startsWith(marker)) {
- ++markersSeen;
- if (line.length() > marker.length() + 1) {
- errnoStdout = Integer.valueOf(line.substring(marker.length() + 1));
- break;
+ synchronized (lock) {
+ /* Start inside synchronized block to prevent a concurrent call to stop(). */
+ start();
+ final String marker = UUID.randomUUID().toString();
+ final String script = "echo " + marker + "; echo " + marker + " >&2; (" + command +
+ "); ret=$?; echo " + marker + " $ret; echo " + marker + " $ret >&2\n";
+ Log.v(TAG, "executing: " + command);
+ stdin.write(script);
+ stdin.flush();
+ String line;
+ int errnoStdout = Integer.MIN_VALUE;
+ int errnoStderr = Integer.MAX_VALUE;
+ int markersSeen = 0;
+ while ((line = stdout.readLine()) != null) {
+ if (line.startsWith(marker)) {
+ ++markersSeen;
+ if (line.length() > marker.length() + 1) {
+ errnoStdout = Integer.valueOf(line.substring(marker.length() + 1));
+ break;
+ }
+ } else if (markersSeen > 0) {
+ if (output != null)
+ output.add(line);
+ Log.v(TAG, "stdout: " + line);
}
- } else if (markersSeen > 0) {
- if (output != null)
- output.add(line);
- Log.v(TAG, "stdout: " + line);
}
- }
- while ((line = stderr.readLine()) != null) {
- if (line.startsWith(marker)) {
- ++markersSeen;
- if (line.length() > marker.length() + 1) {
- errnoStderr = Integer.valueOf(line.substring(marker.length() + 1));
- break;
+ while ((line = stderr.readLine()) != null) {
+ if (line.startsWith(marker)) {
+ ++markersSeen;
+ if (line.length() > marker.length() + 1) {
+ errnoStderr = Integer.valueOf(line.substring(marker.length() + 1));
+ break;
+ }
+ } else if (markersSeen > 2) {
+ Log.v(TAG, "stderr: " + line);
}
- } else if (markersSeen > 2) {
- Log.v(TAG, "stderr: " + line);
}
+ if (markersSeen != 4)
+ throw new IOException("Expected 4 markers, received " + markersSeen);
+ if (errnoStdout != errnoStderr)
+ throw new IOException("Unable to read exit status");
+ Log.v(TAG, "exit: " + errnoStdout);
+ return errnoStdout;
}
- if (markersSeen != 4)
- throw new IOException("Expected 4 markers, received " + markersSeen);
- if (errnoStdout != errnoStderr)
- throw new IOException("Unable to read exit status");
- Log.v(TAG, "exit: " + errnoStdout);
- return errnoStdout;
}
- public synchronized void start() throws IOException, NoRootException {
- if (isRunning())
- return;
- if (!localBinaryDir.isDirectory() && !localBinaryDir.mkdirs())
- throw new FileNotFoundException("Could not create local binary directory");
- if (!localTemporaryDir.isDirectory() && !localTemporaryDir.mkdirs())
- throw new FileNotFoundException("Could not create local temporary directory");
+ public void start() throws IOException, NoRootException {
if (!isExecutableInPath(SU))
throw new NoRootException(deviceNotRootedMessage);
- try {
- final ProcessBuilder builder = new ProcessBuilder().command(SU);
- builder.environment().put("LC_ALL", "C");
+ synchronized (lock) {
+ if (isRunning())
+ return;
+ if (!localBinaryDir.isDirectory() && !localBinaryDir.mkdirs())
+ throw new FileNotFoundException("Could not create local binary directory");
+ if (!localTemporaryDir.isDirectory() && !localTemporaryDir.mkdirs())
+ throw new FileNotFoundException("Could not create local temporary directory");
try {
- process = builder.start();
- } catch (final IOException e) {
- // A failure at this stage means the device isn't rooted.
- throw new NoRootException(deviceNotRootedMessage, e);
- }
- stdin = new OutputStreamWriter(process.getOutputStream(), StandardCharsets.UTF_8);
- stdout = new BufferedReader(new InputStreamReader(process.getInputStream(),
- StandardCharsets.UTF_8));
- stderr = new BufferedReader(new InputStreamReader(process.getErrorStream(),
- StandardCharsets.UTF_8));
- stdin.write(preamble);
- stdin.flush();
- // Check that the shell started successfully.
- final String uid = stdout.readLine();
- if (!"0".equals(uid)) {
- Log.w(TAG, "Root check did not return correct UID: " + uid);
- throw new NoRootException(deviceNotRootedMessage);
- }
- if (!isRunning()) {
- String line;
- while ((line = stderr.readLine()) != null) {
- Log.w(TAG, "Root check returned an error: " + line);
- if (line.contains("Permission denied"))
- throw new NoRootException(deviceNotRootedMessage);
+ final ProcessBuilder builder = new ProcessBuilder().command(SU);
+ builder.environment().put("LC_ALL", "C");
+ try {
+ process = builder.start();
+ } catch (final IOException e) {
+ // A failure at this stage means the device isn't rooted.
+ throw new NoRootException(deviceNotRootedMessage, e);
}
- throw new IOException("Shell failed to start: " + process.exitValue());
+ stdin = new OutputStreamWriter(process.getOutputStream(), StandardCharsets.UTF_8);
+ stdout = new BufferedReader(new InputStreamReader(process.getInputStream(),
+ StandardCharsets.UTF_8));
+ stderr = new BufferedReader(new InputStreamReader(process.getErrorStream(),
+ StandardCharsets.UTF_8));
+ stdin.write(preamble);
+ stdin.flush();
+ // Check that the shell started successfully.
+ final String uid = stdout.readLine();
+ if (!"0".equals(uid)) {
+ Log.w(TAG, "Root check did not return correct UID: " + uid);
+ throw new NoRootException(deviceNotRootedMessage);
+ }
+ if (!isRunning()) {
+ String line;
+ while ((line = stderr.readLine()) != null) {
+ Log.w(TAG, "Root check returned an error: " + line);
+ if (line.contains("Permission denied"))
+ throw new NoRootException(deviceNotRootedMessage);
+ }
+ throw new IOException("Shell failed to start: " + process.exitValue());
+ }
+ } catch (final IOException | NoRootException e) {
+ stop();
+ throw e;
}
- } catch (final IOException | NoRootException e) {
- stop();
- throw e;
}
}
- public synchronized void stop() throws IOException {
- if (process != null) {
- process.destroy();
- process = null;
+ public void stop() {
+ synchronized (lock) {
+ if (process != null) {
+ process.destroy();
+ process = null;
+ }
}
}
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