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Read Tor process's stdout until it exits.

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On Windows, RunAsDaemon is a no-op so we need to read stdout to find out when Tor has finished starting up, then continue to read and discard stdout until Tor exits.
This commit is contained in:
akwizgran
2022-04-15 10:43:28 +01:00
parent 4993873ae2
commit a38933df66
2 changed files with 70 additions and 25 deletions
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50
bramble-core/src/main/java/org/briarproject/bramble/plugin/tor/TorPlugin.java
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@@ -107,7 +107,7 @@ import static org.briarproject.bramble.util.StringUtils.isNullOrEmpty;
@ParametersNotNullByDefault
abstract class TorPlugin implements DuplexPlugin, EventHandler, EventListener {
private static final Logger LOG = getLogger(TorPlugin.class.getName());
protected static final Logger LOG = getLogger(TorPlugin.class.getName());
private static final String[] EVENTS = {
"CIRC",
@@ -124,7 +124,8 @@ abstract class TorPlugin implements DuplexPlugin, EventHandler, EventListener {
private static final int COOKIE_POLLING_INTERVAL_MS = 200;
private static final Pattern ONION_V3 = Pattern.compile("[a-z2-7]{56}");
private final Executor ioExecutor, wakefulIoExecutor;
protected final Executor ioExecutor;
private final Executor wakefulIoExecutor;
private final Executor connectionStatusExecutor;
private final NetworkManager networkManager;
private final LocationUtils locationUtils;
@@ -260,29 +261,9 @@ abstract class TorPlugin implements DuplexPlugin, EventHandler, EventListener {
} catch (SecurityException | IOException e) {
throw new PluginException(e);
}
// Log the process's standard output until it detaches
if (LOG.isLoggable(INFO)) {
Scanner stdout = new Scanner(torProcess.getInputStream());
Scanner stderr = new Scanner(torProcess.getErrorStream());
while (stdout.hasNextLine() || stderr.hasNextLine()) {
if (stdout.hasNextLine()) {
LOG.info(stdout.nextLine());
}
if (stderr.hasNextLine()) {
LOG.info(stderr.nextLine());
}
}
stdout.close();
stderr.close();
}
try {
// Wait for the process to detach or exit
int exit = torProcess.waitFor();
if (exit != 0) {
if (LOG.isLoggable(WARNING))
LOG.warning("Tor exited with value " + exit);
throw new PluginException();
}
// Wait for the Tor process to start
waitForTorToStart(torProcess);
// Wait for the auth cookie file to be created/updated
long start = clock.currentTimeMillis();
while (cookieFile.length() < 32) {
@@ -398,7 +379,7 @@ abstract class TorPlugin implements DuplexPlugin, EventHandler, EventListener {
return zin;
}
private static void append(StringBuilder strb, String name, int value) {
private static void append(StringBuilder strb, String name, Object value) {
strb.append(name);
strb.append(" ");
strb.append(value);
@@ -406,9 +387,11 @@ abstract class TorPlugin implements DuplexPlugin, EventHandler, EventListener {
}
private InputStream getConfigInputStream() {
File dataDirectory = new File(torDirectory, ".tor");
StringBuilder strb = new StringBuilder();
append(strb, "ControlPort", torControlPort);
append(strb, "CookieAuthentication", 1);
append(strb, "DataDirectory", dataDirectory.getAbsolutePath());
append(strb, "DisableNetwork", 1);
append(strb, "RunAsDaemon", 1);
append(strb, "SafeSocks", 1);
@@ -445,6 +428,23 @@ abstract class TorPlugin implements DuplexPlugin, EventHandler, EventListener {
}
}
protected void waitForTorToStart(Process torProcess)
throws InterruptedException, PluginException {
Scanner stdout = new Scanner(torProcess.getInputStream());
// Log the first line of stdout (contains Tor and library versions)
if (stdout.hasNextLine()) LOG.info(stdout.nextLine());
// Read the process's stdout (and redirected stderr) until it detaches
while (stdout.hasNextLine()) stdout.nextLine();
stdout.close();
// Wait for the process to detach or exit
int exit = torProcess.waitFor();
if (exit != 0) {
if (LOG.isLoggable(WARNING))
LOG.warning("Tor exited with value " + exit);
throw new PluginException();
}
}
private void bind() {
ioExecutor.execute(() -> {
// If there's already a port number stored in config, reuse it