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/*
* Copyright © 2018 Samuel Holland <samuel@sholland.org>
* Copyright © 2018 Jason A. Donenfeld <Jason@zx2c4.com>. All Rights Reserved.
* SPDX-License-Identifier: GPL-2.0-or-later
*/
package com.wireguard.android.util;
import android.content.Context;
import android.system.OsConstants;
import android.util.Log;
import com.wireguard.android.Application.ApplicationContext;
import com.wireguard.android.Application.ApplicationScope;
import com.wireguard.android.util.RootShell.NoRootException;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.util.Arrays;
import java.util.List;
import javax.inject.Inject;
/**
* Helper to install WireGuard tools to the system partition.
*/
@ApplicationScope
public final class ToolsInstaller {
private static final String[][] EXECUTABLES = {
{"libwg.so", "wg"},
{"libwg-quick.so", "wg-quick"},
};
private static final File[] INSTALL_DIRS = {
new File("/system/xbin"),
new File("/system/bin"),
};
private static final File INSTALL_DIR = getInstallDir();
private static final String TAG = "WireGuard/" + ToolsInstaller.class.getSimpleName();
private final File localBinaryDir;
private final Object lock = new Object();
private final File nativeLibraryDir;
private final RootShell rootShell;
private Boolean areToolsAvailable;
@Inject
public ToolsInstaller(@ApplicationContext final Context context, final RootShell rootShell) {
localBinaryDir = new File(context.getCacheDir(), "bin");
nativeLibraryDir = new File(context.getApplicationInfo().nativeLibraryDir);
this.rootShell = rootShell;
}
private static File getInstallDir() {
final String path = System.getenv("PATH");
if (path == null)
return INSTALL_DIRS[0];
final List<String> paths = Arrays.asList(path.split(":"));
for (final File dir : INSTALL_DIRS) {
if (paths.contains(dir.getPath()) && dir.isDirectory())
return dir;
}
return null;
}
public int areInstalled() throws NoRootException {
if (INSTALL_DIR == null)
return OsConstants.ENOENT;
final StringBuilder script = new StringBuilder();
for (final String[] names : EXECUTABLES) {
script.append(String.format("cmp -s '%s' '%s' && ",
new File(nativeLibraryDir, names[0]),
new File(INSTALL_DIR, names[1])));
}
script.append("exit ").append(OsConstants.EALREADY).append(';');
try {
return rootShell.run(null, script.toString());
} catch (final IOException ignored) {
return OsConstants.EXIT_FAILURE;
}
}
public void ensureToolsAvailable() throws FileNotFoundException, NoRootException {
synchronized (lock) {
if (areToolsAvailable == null) {
final int ret = symlink();
if (ret == OsConstants.EALREADY) {
Log.d(TAG, "Tools were already symlinked into our private binary dir");
areToolsAvailable = true;
} else if (ret == OsConstants.EXIT_SUCCESS) {
Log.d(TAG, "Tools are now symlinked into our private binary dir");
areToolsAvailable = true;
} else {
Log.e(TAG, "For some reason, wg and wg-quick are not available at all");
areToolsAvailable = false;
}
}
if (!areToolsAvailable)
throw new FileNotFoundException("Required tools unavailable");
}
}
public int install() throws NoRootException {
if (INSTALL_DIR == null)
return OsConstants.ENOENT;
final StringBuilder script = new StringBuilder("set -ex; ");
script.append("trap 'mount -o ro,remount /system' EXIT; mount -o rw,remount /system; ");
for (final String[] names : EXECUTABLES) {
final File destination = new File(INSTALL_DIR, names[1]);
script.append(String.format("cp '%s' '%s'; chmod 755 '%s'; restorecon '%s' || true; ",
new File(nativeLibraryDir, names[0]), destination, destination, destination));
}
try {
return rootShell.run(null, script.toString());
} catch (final IOException ignored) {
return OsConstants.EXIT_FAILURE;
}
}
public int symlink() throws NoRootException {
final StringBuilder script = new StringBuilder("set -x; ");
for (final String[] names : EXECUTABLES) {
script.append(String.format("test '%s' -ef '%s' && ",
new File(nativeLibraryDir, names[0]),
new File(localBinaryDir, names[1])));
}
script.append("exit ").append(OsConstants.EALREADY).append("; set -e; ");
for (final String[] names : EXECUTABLES) {
script.append(String.format("ln -fns '%s' '%s'; ",
new File(nativeLibraryDir, names[0]),
new File(localBinaryDir, names[1])));
}
script.append("exit ").append(OsConstants.EXIT_SUCCESS).append(';');
try {
return rootShell.run(null, script.toString());
} catch (final IOException ignored) {
return OsConstants.EXIT_FAILURE;
}
}
}
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