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WgQuickBackend: Finish the implementation

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Signed-off-by: Samuel Holland <samuel@sholland.org>
This commit is contained in:
Samuel Holland 2018-01-09 10:25:06 -06:00
parent 933a685585
commit 17f8c65b2e
1 changed files with 29 additions and 7 deletions
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36
app/src/main/java/com/wireguard/android/backend/WgQuickBackend.java
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@ -13,6 +13,8 @@ import com.wireguard.android.util.ToolsInstaller;
import com.wireguard.config.Config;
import java.io.File;
import java.io.FileOutputStream;
import java.nio.charset.StandardCharsets;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
@ -29,23 +31,45 @@ public final class WgQuickBackend implements Backend {
private static final String TAG = "WireGuard/" + WgQuickBackend.class.getSimpleName();
private final Context context;
private final File localTemporaryDir;
private final RootShell rootShell;
private final ToolsInstaller toolsInstaller;
public WgQuickBackend(final Context context, final RootShell rootShell,
final ToolsInstaller toolsInstaller) {
this.context = context;
localTemporaryDir = new File(context.getCacheDir(), "tmp");
this.rootShell = rootShell;
this.toolsInstaller = toolsInstaller;
}
@Override
public Config applyConfig(final Tunnel tunnel, final Config config) {
if (tunnel.getState() == State.UP)
throw new UnsupportedOperationException("Not implemented");
public Config applyConfig(final Tunnel tunnel, final Config config) throws Exception {
if (tunnel.getState() == State.UP) {
// Restart the tunnel to apply the new config.
setState(tunnel, State.DOWN);
try {
bringUpTunnel(tunnel, config);
} catch (final Exception e) {
// The new configuration didn't work, so try to go back to the old one.
bringUpTunnel(tunnel, tunnel.getConfig());
throw e;
}
}
return config;
}
private int bringUpTunnel(final Tunnel tunnel, final Config config) throws Exception {
final File tempFile = new File(localTemporaryDir, tunnel.getName() + ".conf");
try (FileOutputStream stream = new FileOutputStream(tempFile, false)) {
stream.write(config.toString().getBytes(StandardCharsets.UTF_8));
}
final int result = rootShell.run(null, "wg-quick up '" + tempFile.getAbsolutePath() + '\'');
if (!tempFile.delete())
Log.w(TAG, "Couldn't delete temporary file after bringing up " + tunnel.getName());
return result;
}
@Override
public Set<String> enumerate() {
final List<String> output = new ArrayList<>();
@ -85,11 +109,9 @@ public final class WgQuickBackend implements Backend {
if (state == State.UP) {
if (!new File("/sys/module/wireguard").exists())
throw new ErrnoException("WireGuard module not loaded", OsConstants.ENODEV);
// FIXME: Assumes file layout from FileConfigStore. Use a temporary file.
final File file = new File(context.getFilesDir(), tunnel.getName() + ".conf");
result = rootShell.run(null, String.format("wg-quick up '%s'", file.getAbsolutePath()));
result = bringUpTunnel(tunnel, tunnel.getConfig());
} else {
result = rootShell.run(null, String.format("wg-quick down '%s'", tunnel.getName()));
result = rootShell.run(null, "wg-quick down '" + tunnel.getName() + '\'');
}
if (result != 0)
throw new Exception("wg-quick failed");