/*

 * Copyright (c) 2013, 2016, Oracle and/or its affiliates. All rights reserved.

 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

 *

 * This code is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License version 2 only, as

 * published by the Free Software Foundation.

 *

 * This code is distributed in the hope that it will be useful, but WITHOUT

 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

 * version 2 for more details (a copy is included in the LICENSE file that

 * accompanied this code).

 *

 * You should have received a copy of the GNU General Public License version

 * 2 along with this work; if not, write to the Free Software Foundation,

 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

 *

 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

 * or visit www.oracle.com if you need additional information or have any

 * questions.

 */

package jdk.test.lib;

import java.util.regex.Pattern;

public class Platform {

    public  static final String vmName      = System.getProperty("java.vm.name");

    public  static final String vmInfo      = System.getProperty("java.vm.info");

    private static final String osName      = System.getProperty("os.name");

    private static final String dataModel   = System.getProperty("sun.arch.data.model");

    private static final String vmVersion   = System.getProperty("java.vm.version");

    private static final String jdkDebug    = System.getProperty("jdk.debug");

    private static final String osArch      = System.getProperty("os.arch");

    private static final String userName    = System.getProperty("user.name");

    private static final String compiler    = System.getProperty("sun.management.compiler");

    public static boolean isClient() {

        return vmName.endsWith(" Client VM");

    }

    public static boolean isServer() {

        return vmName.endsWith(" Server VM");

    }

    public static boolean isGraal() {

        return vmName.endsWith(" Graal VM");

    }

    public static boolean isZero() {

        return vmName.endsWith(" Zero VM");

    }

    public static boolean isMinimal() {

        return vmName.endsWith(" Minimal VM");

    }

    public static boolean isEmbedded() {

        return vmName.contains("Embedded");

    }

    public static boolean isTieredSupported() {

        return compiler.contains("Tiered Compilers");

    }

    public static boolean isInt() {

        return vmInfo.contains("interpreted");

    }

    public static boolean isMixed() {

        return vmInfo.contains("mixed");

    }

    public static boolean isComp() {

        return vmInfo.contains("compiled");

    }

    public static boolean is32bit() {

        return dataModel.equals("32");

    }

    public static boolean is64bit() {

        return dataModel.equals("64");

    }

    public static boolean isAix() {

        return isOs("aix");

    }

    public static boolean isLinux() {

        return isOs("linux");

    }

    public static boolean isOSX() {

        return isOs("mac");

    }

    public static boolean isSolaris() {

        return isOs("sunos");

    }

    public static boolean isWindows() {

        return isOs("win");

    }

    private static boolean isOs(String osname) {

        return osName.toLowerCase().startsWith(osname.toLowerCase());

    }

    public static String getOsName() {

        return osName;

    }

    public static boolean isDebugBuild() {

        return (jdkDebug.toLowerCase().contains("debug"));

    }

    public static String getVMVersion() {

        return vmVersion;

    }

    // Returns true for sparc and sparcv9.

    public static boolean isSparc() {

        return isArch("sparc.*");

    }

    public static boolean isARM() {

        return isArch("arm.*");

    }

    public static boolean isPPC() {

        return isArch("ppc.*");

    }

    public static boolean isX86() {

        // On Linux it's 'i386', Windows 'x86' without '_64' suffix.

        return isArch("(i386)|(x86(?!_64))");

    }

    public static boolean isX64() {

        // On OSX it's 'x86_64' and on other (Linux, Windows and Solaris) platforms it's 'amd64'

        return isArch("(amd64)|(x86_64)");

    }

    public static boolean isAArch64() {

        return isArch("aarch64");

    }

    public static String getOsArch() {

        return osArch;

    }

    /**

     * Return a boolean for whether we expect to be able to attach

     * the SA to our own processes on this system.

     */

    public static boolean shouldSAAttach() throws Exception {

        if (isAix()) {

            return false;   // SA not implemented.

        } else if (isLinux()) {

            return canPtraceAttachLinux();

        } else if (isOSX()) {

            return canAttachOSX();

        } else {

            // Other platforms expected to work:

            return true;

        }

    }

    /**

     * On Linux, first check the SELinux boolean "deny_ptrace" and return false

     * as we expect to be denied if that is "1".  Then expect permission to attach

     * if we are root, so return true.  Then return false for an expected denial

     * if "ptrace_scope" is 1, and true otherwise.

     */

    public static boolean canPtraceAttachLinux() throws Exception {

        // SELinux deny_ptrace:

        String deny_ptrace = Utils.fileAsString("/sys/fs/selinux/booleans/deny_ptrace");

        if (deny_ptrace != null && deny_ptrace.contains("1")) {

            // ptrace will be denied:

            return false;

        }

        // YAMA enhanced security ptrace_scope:

        // 0 - a process can PTRACE_ATTACH to any other process running under the same uid

        // 1 - restricted ptrace: a process must be a children of the inferior or user is root

        // 2 - only processes with CAP_SYS_PTRACE may use ptrace or user is root

        // 3 - no attach: no processes may use ptrace with PTRACE_ATTACH

        String ptrace_scope = Utils.fileAsString("/proc/sys/kernel/yama/ptrace_scope");

        if (ptrace_scope != null) {

            if (ptrace_scope.startsWith("3")) {

                return false;

            }

            if (!userName.equals("root") && !ptrace_scope.startsWith("0")) {

                // ptrace will be denied:

                return false;

            }

        }

        // Otherwise expect to be permitted:

        return true;

    }

    /**

     * On OSX, expect permission to attach only if we are root.

     */

    public static boolean canAttachOSX() throws Exception {

        return userName.equals("root");

    }

    private static boolean isArch(String archnameRE) {

        return Pattern.compile(archnameRE, Pattern.CASE_INSENSITIVE)

                      .matcher(osArch)

                      .matches();

    }

}