/*
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* Copyright (C) 2011 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#ifdef _WIN32
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// Indicate we want at least all Windows Server 2003 (5.2) APIs.
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// Note: default is set by system/core/include/arch/windows/AndroidConfig.h to 0x0500
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// which is Win2K. However our minimum SDK tools requirement is Win XP (0x0501).
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// However we do need 0x0502 to get access to the WOW-64-32 constants for the
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// registry, except we'll need to be careful since they are not available on XP.
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#undef _WIN32_WINNT
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#define _WIN32_WINNT 0x0502
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// Indicate we want at least all IE 5 shell APIs
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#define _WIN32_IE 0x0500
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#include "find_java.h"
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#include <shlobj.h>
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#include <ctype.h>
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// Define some types missing in MingW
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#ifndef LSTATUS
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typedef LONG LSTATUS;
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#endif
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// Check to see if the application is running in 32-bit or 64-bit mode. In other words, this will
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// return false if you run a 32-bit build even on a 64-bit machine.
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static bool isApplication64() {
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SYSTEM_INFO sysInfo;
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GetSystemInfo(&sysInfo);
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// Note: The constant name here is a bit misleading, as it actually covers all 64-bit processors
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// and not just AMD.
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// See also: http://msdn.microsoft.com/en-us/library/windows/desktop/ms724958(v=vs.85).aspx
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return (sysInfo.wProcessorArchitecture == PROCESSOR_ARCHITECTURE_AMD64);
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}
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// Extract the first thing that looks like (digit.digit+).
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// Note: this will break when java reports a version with major > 9.
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// However it will reasonably cope with "1.10", if that ever happens.
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static bool extractJavaVersion(const char *start,
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int length,
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CString *outVersionStr,
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int *outVersionInt) {
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const char *end = start + length;
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for (const char *c = start; c < end - 2; c++) {
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if (isdigit(c[0]) &&
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c[1] == '.' &&
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isdigit(c[2])) {
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const char *e = c+2;
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while (isdigit(e[1])) {
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e++;
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}
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if (outVersionStr != NULL) {
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outVersionStr->set(c, e - c + 1);
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}
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if (outVersionInt != NULL) {
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// add major * 1000, currently only 1 digit
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int value = (*c - '0') * 1000;
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// add minor
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for (int m = 1; *e != '.'; e--, m *= 10) {
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value += (*e - '0') * m;
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}
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*outVersionInt = value;
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}
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return true;
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}
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}
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return false;
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}
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// Check if the passed in path is a path to a JDK
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static bool isJdkPath(const CPath &path) {
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// If the files "bin/java.exe" and "lib/tools.jar" exist, we're probably a JDK.
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CPath pathBin(path);
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pathBin.addPath("bin");
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pathBin.addPath("java.exe");
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CPath pathTools(path);
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pathTools.addPath("lib");
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pathTools.addPath("tools.jar");
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return (pathBin.fileExists() && pathTools.fileExists());
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}
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// Check whether we can find $PATH/java.exe.
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// inOutPath should be the directory where we're looking at.
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// In output, it will be the java path we tested.
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// Returns the java version integer found (e.g. 1006 for 1.6).
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// Return 0 in case of error.
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static int checkPath(CPath *inOutPath) {
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inOutPath->addPath("java.exe");
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int result = 0;
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if (inOutPath->fileExists()) {
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// Run java -version
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// Reject the version if it's not at least our current minimum.
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if (!getJavaVersion(*inOutPath, NULL /*versionStr*/, &result)) {
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result = 0;
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}
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}
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return result;
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}
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// Check whether we can find $PATH/bin/java.exe
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// Returns the Java version found (e.g. 1006 for 1.6) or 0 in case of error.
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static int checkBinPath(CPath *inOutPath) {
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inOutPath->addPath("bin");
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return checkPath(inOutPath);
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}
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// Test for the existence of java.exe in a custom path
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int findJavaInPath(const CPath &path, CPath *outJavaPath, bool isJdk, int minVersion) {
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SetLastError(0);
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int version = 0;
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CPath temp(path);
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if (!isJdk) {
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version = checkPath(&temp);
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}
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else {
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if (isJdkPath(temp)) {
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version = checkBinPath(&temp);
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}
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}
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if (version >= minVersion) {
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if (gIsDebug) {
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fprintf(stderr, "Java %d found in path: %s\n", version, temp.cstr());
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}
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*outJavaPath = temp;
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return version;
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}
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return 0;
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}
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// Search java.exe in the environment
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int findJavaInEnvPath(CPath *outJavaPath, bool isJdk, int minVersion) {
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SetLastError(0);
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const char* envPath = getenv("JAVA_HOME");
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if (envPath != NULL) {
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CPath p(envPath);
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if (!isJdk || isJdkPath(p)) {
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int v = checkBinPath(&p);
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if (v >= minVersion) {
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if (gIsDebug) {
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fprintf(stderr, "Java %d found via JAVA_HOME: %s\n", v, p.cstr());
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}
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*outJavaPath = p;
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// As an optimization for runtime, if we find a suitable java
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// version in JAVA_HOME we won't waste time looking at the PATH.
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return v;
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}
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}
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}
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int currVersion = 0;
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envPath = getenv("PATH");
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if (!envPath) return currVersion;
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// Otherwise look at the entries in the current path.
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// If we find more than one, keep the one with the highest version.
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CArray<CString> *paths = CString(envPath).split(';');
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for(int i = 0; i < paths->size(); i++) {
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CPath p((*paths)[i].cstr());
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if (isJdk && !isJdkPath(p)) {
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continue;
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}
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int v = checkPath(&p);
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if (v >= minVersion && v > currVersion) {
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if (gIsDebug) {
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fprintf(stderr, "Java %d found via env PATH: %s\n", v, p.cstr());
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}
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currVersion = v;
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*outJavaPath = p;
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}
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}
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delete paths;
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return currVersion;
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}
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// --------------
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static bool getRegValue(const char *keyPath,
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const char *keyName,
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REGSAM access,
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CString *outValue) {
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HKEY key;
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LSTATUS status = RegOpenKeyExA(
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HKEY_LOCAL_MACHINE, // hKey
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keyPath, // lpSubKey
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0, // ulOptions
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KEY_READ | access, // samDesired,
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&key); // phkResult
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if (status == ERROR_SUCCESS) {
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LSTATUS ret = ERROR_MORE_DATA;
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DWORD size = 4096; // MAX_PATH is 260, so 4 KB should be good enough
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char* buffer = (char*) malloc(size);
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while (ret == ERROR_MORE_DATA && size < (1<<16) /*64 KB*/) {
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ret = RegQueryValueExA(
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key, // hKey
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keyName, // lpValueName
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NULL, // lpReserved
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NULL, // lpType
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(LPBYTE) buffer, // lpData
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&size); // lpcbData
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if (ret == ERROR_MORE_DATA) {
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size *= 2;
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buffer = (char*) realloc(buffer, size);
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} else {
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buffer[size] = 0;
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}
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}
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if (ret != ERROR_MORE_DATA) outValue->set(buffer);
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free(buffer);
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RegCloseKey(key);
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return (ret != ERROR_MORE_DATA);
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}
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return false;
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}
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// Explore the registry to find a suitable version of Java.
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// Returns an int which is the version of Java found (e.g. 1006 for 1.6) and the
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// matching path in outJavaPath.
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// Returns 0 if nothing suitable was found.
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static int exploreJavaRegistry(const char *entry, REGSAM access, int minVersion,
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CPath *outJavaPath) {
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// Let's visit HKEY_LOCAL_MACHINE\SOFTWARE\JavaSoft\Java Runtime Environment [CurrentVersion]
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CPath rootKey("SOFTWARE\\JavaSoft\\");
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rootKey.addPath(entry);
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int versionInt = 0;
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CString currentVersion;
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CPath subKey(rootKey);
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if (getRegValue(subKey.cstr(), "CurrentVersion", access, ¤tVersion)) {
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// CurrentVersion should be something like "1.7".
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// We want to read HKEY_LOCAL_MACHINE\SOFTWARE\JavaSoft\Java Runtime Environment\1.7 [JavaHome]
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subKey.addPath(currentVersion);
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CPath javaHome;
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if (getRegValue(subKey.cstr(), "JavaHome", access, &javaHome)) {
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versionInt = checkBinPath(&javaHome);
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if (versionInt >= 0) {
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if (gIsDebug) {
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fprintf(stderr,
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"Java %d found via registry: %s\n",
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versionInt, javaHome.cstr());
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}
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*outJavaPath = javaHome;
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}
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if (versionInt >= minVersion) {
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// Heuristic: if the current version is good enough, stop here
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return versionInt;
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}
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}
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}
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// Try again, but this time look at all the versions available
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HKEY javaHomeKey;
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LSTATUS status = RegOpenKeyExA(
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HKEY_LOCAL_MACHINE, // hKey
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"SOFTWARE\\JavaSoft", // lpSubKey
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0, // ulOptions
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KEY_READ | access, // samDesired
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&javaHomeKey); // phkResult
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if (status == ERROR_SUCCESS) {
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char name[256];
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DWORD index = 0;
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CPath javaHome;
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for (LONG result = ERROR_SUCCESS; result == ERROR_SUCCESS; index++) {
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DWORD nameLen = 255;
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name[nameLen] = 0;
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result = RegEnumKeyExA(
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javaHomeKey, // hKey
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index, // dwIndex
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name, // lpName
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&nameLen, // lpcName
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NULL, // lpReserved
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NULL, // lpClass
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NULL, // lpcClass,
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NULL); // lpftLastWriteTime
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if (result == ERROR_SUCCESS && nameLen < 256) {
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name[nameLen] = 0;
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CPath subKey(rootKey);
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subKey.addPath(name);
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if (getRegValue(subKey.cstr(), "JavaHome", access, &javaHome)) {
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int v = checkBinPath(&javaHome);
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if (v > versionInt) {
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if (gIsDebug) {
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fprintf(stderr,
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"Java %d found via registry: %s\n",
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versionInt, javaHome.cstr());
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}
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*outJavaPath = javaHome;
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versionInt = v;
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}
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}
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}
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}
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RegCloseKey(javaHomeKey);
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}
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return 0;
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}
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static bool getMaxJavaInRegistry(const char *entry, REGSAM access, CPath *outJavaPath, int *inOutVersion) {
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CPath path;
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int version = exploreJavaRegistry(entry, access, *inOutVersion, &path);
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if (version > *inOutVersion) {
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*outJavaPath = path;
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*inOutVersion = version;
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return true;
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}
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return false;
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}
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int findJavaInRegistry(CPath *outJavaPath, bool isJdk, int minVersion) {
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// Check the JRE first, then the JDK.
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int version = minVersion - 1; // Inner methods check if they're greater than this version.
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bool result = false;
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result |= (!isJdk && getMaxJavaInRegistry("Java Runtime Environment", 0, outJavaPath, &version));
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result |= getMaxJavaInRegistry("Java Development Kit", 0, outJavaPath, &version);
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// Even if we're 64-bit, try again but check the 32-bit registry, looking for 32-bit java.
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if (isApplication64()) {
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result |= (!isJdk &&
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getMaxJavaInRegistry("Java Runtime Environment", KEY_WOW64_32KEY, outJavaPath, &version));
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result |= getMaxJavaInRegistry("Java Development Kit", KEY_WOW64_32KEY, outJavaPath, &version);
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}
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return result ? version : 0;
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}
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// --------------
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static bool checkProgramFiles(CPath *outJavaPath, int *inOutVersion, bool isJdk,
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bool force32bit) {
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char programFilesPath[MAX_PATH + 1];
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int nFolder = force32bit ? CSIDL_PROGRAM_FILESX86 : CSIDL_PROGRAM_FILES;
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HRESULT result = SHGetFolderPathA(
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NULL, // hwndOwner
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nFolder,
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NULL, // hToken
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SHGFP_TYPE_CURRENT, // dwFlags
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programFilesPath); // pszPath
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if (FAILED(result)) return false;
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CPath path(programFilesPath);
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path.addPath("Java");
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// Do we have a C:\Program Files\Java directory?
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if (!path.dirExists()) return false;
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CPath glob(path);
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glob.addPath("j*");
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bool found = false;
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WIN32_FIND_DATAA findData;
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HANDLE findH = FindFirstFileA(glob.cstr(), &findData);
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if (findH == INVALID_HANDLE_VALUE) return false;
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do {
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if ((findData.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY) != 0) {
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CPath temp(path);
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temp.addPath(findData.cFileName);
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// Check C:\Program Files\Java\j*\bin\java.exe
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if (!isJdk || isJdkPath(temp)) {
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int v = checkBinPath(&temp);
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if (v > *inOutVersion) {
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found = true;
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*inOutVersion = v;
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*outJavaPath = temp;
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}
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}
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}
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} while (!found && FindNextFileA(findH, &findData) != 0);
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FindClose(findH);
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return found;
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}
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int findJavaInProgramFiles(CPath *outJavaPath, bool isJdk, int minVersion) {
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// Check the C:\Program Files directory
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bool result = false;
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int version = minVersion - 1; // Inner methods check if they're greater than this version.
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result |= checkProgramFiles(outJavaPath, &version, isJdk, false);
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// Even if we're 64-bit, try again but check the C:\Program Files (x86) directory, looking for
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// 32-bit java.
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if (isApplication64()) {
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result |= checkProgramFiles(outJavaPath, &version, isJdk, true);
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}
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return result ? version : 0;
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}
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// --------------
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// Tries to invoke the java.exe at the given path and extract it's
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// version number.
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// - outVersionStr: if not null, will capture version as a string (e.g. "1.6")
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// - outVersionInt: if not null, will capture version as an int (major * 1000 + minor, e.g. 1006).
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bool getJavaVersion(CPath &javaPath, CString *outVersionStr, int *outVersionInt) {
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bool result = false;
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// Run "java -version", which outputs something like to *STDERR*:
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//
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// java version "1.6.0_29"
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// Java(TM) SE Runtime Environment (build 1.6.0_29-b11)
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// Java HotSpot(TM) Client VM (build 20.4-b02, mixed mode, sharing)
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//
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// We want to capture the first line, and more exactly the "1.6" part.
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CString cmd;
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cmd.setf("\"%s\" -version", javaPath.cstr());
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SECURITY_ATTRIBUTES saAttr;
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STARTUPINFO startup;
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PROCESS_INFORMATION pinfo;
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// Want to inherit pipe handle
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ZeroMemory(&saAttr, sizeof(saAttr));
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saAttr.nLength = sizeof(SECURITY_ATTRIBUTES);
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saAttr.bInheritHandle = TRUE;
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saAttr.lpSecurityDescriptor = NULL;
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// Create pipe for stdout
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HANDLE stdoutPipeRd, stdoutPipeWt;
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if (!CreatePipe(
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&stdoutPipeRd, // hReadPipe,
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&stdoutPipeWt, // hWritePipe,
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&saAttr, // lpPipeAttributes,
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0)) { // nSize (0=default buffer size)
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if (gIsConsole || gIsDebug) displayLastError("CreatePipe failed: ");
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return false;
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}
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if (!SetHandleInformation(stdoutPipeRd, HANDLE_FLAG_INHERIT, 0)) {
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if (gIsConsole || gIsDebug) displayLastError("SetHandleInformation failed: ");
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return false;
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}
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ZeroMemory(&pinfo, sizeof(pinfo));
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ZeroMemory(&startup, sizeof(startup));
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startup.cb = sizeof(startup);
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startup.dwFlags = STARTF_USESHOWWINDOW | STARTF_USESTDHANDLES;
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startup.wShowWindow = SW_HIDE|SW_MINIMIZE;
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// Capture both stderr and stdout
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startup.hStdError = stdoutPipeWt;
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startup.hStdOutput = stdoutPipeWt;
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startup.hStdInput = GetStdHandle(STD_INPUT_HANDLE);
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BOOL ok = CreateProcessA(
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NULL, // program path
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(LPSTR) cmd.cstr(), // command-line
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NULL, // process handle is not inheritable
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NULL, // thread handle is not inheritable
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TRUE, // yes, inherit some handles
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0, // process creation flags
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NULL, // use parent's environment block
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NULL, // use parent's starting directory
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&startup, // startup info, i.e. std handles
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&pinfo);
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if ((gIsConsole || gIsDebug) && !ok) displayLastError("CreateProcess failed: ");
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// Close the write-end of the output pipe (we're only reading from it)
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CloseHandle(stdoutPipeWt);
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// Read from the output pipe. We don't need to read everything,
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// the first line should be 'Java version "1.2.3_45"\r\n'
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// so reading about 32 chars is all we need.
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char first32[32 + 1];
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int index = 0;
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first32[0] = 0;
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if (ok) {
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#define SIZE 1024
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char buffer[SIZE];
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DWORD sizeRead = 0;
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while (ok) {
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// Keep reading in the same buffer location
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ok = ReadFile(stdoutPipeRd, // hFile
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buffer, // lpBuffer
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SIZE, // DWORD buffer size to read
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&sizeRead, // DWORD buffer size read
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NULL); // overlapped
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if (!ok || sizeRead == 0 || sizeRead > SIZE) break;
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// Copy up to the first 32 characters
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if (index < 32) {
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DWORD n = 32 - index;
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if (n > sizeRead) n = sizeRead;
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// copy as lowercase to simplify checks later
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for (char *b = buffer; n > 0; n--, b++, index++) {
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char c = *b;
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if (c >= 'A' && c <= 'Z') c += 'a' - 'A';
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first32[index] = c;
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}
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first32[index] = 0;
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}
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}
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WaitForSingleObject(pinfo.hProcess, INFINITE);
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DWORD exitCode;
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if (GetExitCodeProcess(pinfo.hProcess, &exitCode)) {
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// this should not return STILL_ACTIVE (259)
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result = exitCode == 0;
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}
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CloseHandle(pinfo.hProcess);
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CloseHandle(pinfo.hThread);
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}
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CloseHandle(stdoutPipeRd);
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if (result && index > 0) {
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// Look for a few keywords in the output however we don't
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// care about specific ordering or case-senstiviness.
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// We only captures roughtly the first line in lower case.
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char *j = strstr(first32, "java");
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if (!j) {
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j = strstr(first32, "openjdk");
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}
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char *v = strstr(first32, "version");
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if ((gIsConsole || gIsDebug) && (!j || !v)) {
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fprintf(stderr, "Error: keywords 'java|openjdk version' not found in '%s'\n", first32);
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}
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if (j != NULL && v != NULL) {
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result = extractJavaVersion(first32, index, outVersionStr, outVersionInt);
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}
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}
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return result;
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}
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#endif /* _WIN32 */
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