1 /*
2 * Copyright (c) 2012, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation. Oracle designates this
8 * particular file as subject to the "Classpath" exception as provided
9 * by Oracle in the LICENSE file that accompanied this code.
10 *
11 * This code is distributed in the hope that it will be useful, but WITHOUT
12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
14 * version 2 for more details (a copy is included in the LICENSE file that
15 * accompanied this code).
16 *
17 * You should have received a copy of the GNU General Public License version
18 * 2 along with this work; if not, write to the Free Software Foundation,
19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
20 *
21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
22 * or visit www.oracle.com if you need additional information or have any
23 * questions.
24 */
25 #include "java.h"
26
27 /*
28 * If app is "/foo/bin/javac", or "/foo/bin/sparcv9/javac" then put
29 * "/foo" into buf.
30 */
31 jboolean
32 GetApplicationHome(char *buf, jint bufsize)
33 {
34 const char *execname = GetExecName();
35 if (execname != NULL) {
36 JLI_Snprintf(buf, bufsize, "%s", execname);
37 buf[bufsize-1] = '\0';
38 } else {
39 return JNI_FALSE;
40 }
41
42 if (JLI_StrRChr(buf, '/') == 0) {
43 buf[0] = '\0';
44 return JNI_FALSE;
45 }
46 *(JLI_StrRChr(buf, '/')) = '\0'; /* executable file */
47 if (JLI_StrLen(buf) < 4 || JLI_StrRChr(buf, '/') == 0) {
48 buf[0] = '\0';
49 return JNI_FALSE;
50 }
51 if (JLI_StrCmp("/bin", buf + JLI_StrLen(buf) - 4) != 0)
52 *(JLI_StrRChr(buf, '/')) = '\0'; /* sparcv9 or amd64 */
53 if (JLI_StrLen(buf) < 4 || JLI_StrCmp("/bin", buf + JLI_StrLen(buf) - 4) != 0) {
54 buf[0] = '\0';
55 return JNI_FALSE;
56 }
57 *(JLI_StrRChr(buf, '/')) = '\0'; /* bin */
58
59 return JNI_TRUE;
60 }
61 /*
62 * Return true if the named program exists
63 */
64 static int
65 ProgramExists(char *name)
66 {
67 struct stat sb;
68 if (stat(name, &sb) != 0) return 0;
69 if (S_ISDIR(sb.st_mode)) return 0;
70 return (sb.st_mode & S_IEXEC) != 0;
71 }
72
73 /*
74 * Find a command in a directory, returning the path.
75 */
76 static char *
77 Resolve(char *indir, char *cmd)
78 {
79 char name[PATH_MAX + 2], *real;
80
81 if ((JLI_StrLen(indir) + JLI_StrLen(cmd) + 1) > PATH_MAX) return 0;
82 JLI_Snprintf(name, sizeof(name), "%s%c%s", indir, FILE_SEPARATOR, cmd);
83 if (!ProgramExists(name)) return 0;
84 real = JLI_MemAlloc(PATH_MAX + 2);
85 if (!realpath(name, real))
86 JLI_StrCpy(real, name);
87 return real;
88 }
89
90 /*
91 * Find a path for the executable
92 */
93 char *
94 FindExecName(char *program)
95 {
96 char cwdbuf[PATH_MAX+2];
97 char *path;
98 char *tmp_path;
99 char *f;
100 char *result = NULL;
101
102 /* absolute path? */
103 if (*program == FILE_SEPARATOR ||
104 (FILE_SEPARATOR=='\\' && JLI_StrRChr(program, ':')))
105 return Resolve("", program+1);
106
107 /* relative path? */
108 if (JLI_StrRChr(program, FILE_SEPARATOR) != 0) {
109 char buf[PATH_MAX+2];
110 return Resolve(getcwd(cwdbuf, sizeof(cwdbuf)), program);
111 }
112
113 /* from search path? */
114 path = getenv("PATH");
115 if (!path || !*path) path = ".";
116 tmp_path = JLI_MemAlloc(JLI_StrLen(path) + 2);
117 JLI_StrCpy(tmp_path, path);
118
119 for (f=tmp_path; *f && result==0; ) {
120 char *s = f;
121 while (*f && (*f != PATH_SEPARATOR)) ++f;
122 if (*f) *f++ = 0;
123 if (*s == FILE_SEPARATOR)
124 result = Resolve(s, program);
125 else {
126 /* relative path element */
127 char dir[2*PATH_MAX];
128 JLI_Snprintf(dir, sizeof(dir), "%s%c%s", getcwd(cwdbuf, sizeof(cwdbuf)),
129 FILE_SEPARATOR, s);
130 result = Resolve(dir, program);
131 }
132 if (result != 0) break;
133 }
134
135 JLI_MemFree(tmp_path);
136 return result;
137 }
138
139 void JLI_ReportErrorMessage(const char* fmt, ...) {
140 va_list vl;
141 va_start(vl, fmt);
142 vfprintf(stderr, fmt, vl);
143 fprintf(stderr, "\n");
144 va_end(vl);
145 }
146
147 void JLI_ReportErrorMessageSys(const char* fmt, ...) {
148 va_list vl;
149 char *emsg;
150
151 /*
152 * TODO: its safer to use strerror_r but is not available on
153 * Solaris 8. Until then....
154 */
155 emsg = strerror(errno);
156 if (emsg != NULL) {
157 fprintf(stderr, "%s\n", emsg);
158 }
159
160 va_start(vl, fmt);
161 vfprintf(stderr, fmt, vl);
162 fprintf(stderr, "\n");
163 va_end(vl);
164 }
165
166 void JLI_ReportExceptionDescription(JNIEnv * env) {
167 (*env)->ExceptionDescribe(env);
168 }
169
170 /*
171 * Since using the file system as a registry is a bit risky, perform
172 * additional sanity checks on the identified directory to validate
173 * it as a valid jre/sdk.
174 *
175 * Return 0 if the tests fail; otherwise return non-zero (true).
176 *
177 * Note that checking for anything more than the existence of an
178 * executable object at bin/java relative to the path being checked
179 * will break the regression tests.
180 */
181 static int
182 CheckSanity(char *path, char *dir)
183 {
184 char buffer[PATH_MAX];
185
186 if (JLI_StrLen(path) + JLI_StrLen(dir) + 11 > PATH_MAX)
187 return (0); /* Silently reject "impossibly" long paths */
188
189 JLI_Snprintf(buffer, sizeof(buffer), "%s/%s/bin/java", path, dir);
190 return ((access(buffer, X_OK) == 0) ? 1 : 0);
191 }
192
193 /*
194 * Determine if there is an acceptable JRE in the directory dirname.
195 * Upon locating the "best" one, return a fully qualified path to
196 * it. "Best" is defined as the most advanced JRE meeting the
197 * constraints contained in the manifest_info. If no JRE in this
198 * directory meets the constraints, return NULL.
199 *
200 * Note that we don't check for errors in reading the directory
201 * (which would be done by checking errno). This is because it
202 * doesn't matter if we get an error reading the directory, or
203 * we just don't find anything interesting in the directory. We
204 * just return NULL in either case.
205 *
206 * The historical names of j2sdk and j2re were changed to jdk and
207 * jre respecively as part of the 1.5 rebranding effort. Since the
208 * former names are legacy on Linux, they must be recognized for
209 * all time. Fortunately, this is a minor cost.
210 */
211 static char
212 *ProcessDir(manifest_info *info, char *dirname)
213 {
214 DIR *dirp;
215 struct dirent *dp;
216 char *best = NULL;
217 int offset;
218 int best_offset = 0;
219 char *ret_str = NULL;
220 char buffer[PATH_MAX];
221
222 if ((dirp = opendir(dirname)) == NULL)
223 return (NULL);
224
225 do {
226 if ((dp = readdir(dirp)) != NULL) {
227 offset = 0;
228 if ((JLI_StrNCmp(dp->d_name, "jre", 3) == 0) ||
229 (JLI_StrNCmp(dp->d_name, "jdk", 3) == 0))
230 offset = 3;
231 else if (JLI_StrNCmp(dp->d_name, "j2re", 4) == 0)
232 offset = 4;
233 else if (JLI_StrNCmp(dp->d_name, "j2sdk", 5) == 0)
234 offset = 5;
235 if (offset > 0) {
236 if ((JLI_AcceptableRelease(dp->d_name + offset,
237 info->jre_version)) && CheckSanity(dirname, dp->d_name))
238 if ((best == NULL) || (JLI_ExactVersionId(
239 dp->d_name + offset, best + best_offset) > 0)) {
240 if (best != NULL)
241 JLI_MemFree(best);
242 best = JLI_StringDup(dp->d_name);
243 best_offset = offset;
244 }
245 }
246 }
247 } while (dp != NULL);
248 (void) closedir(dirp);
249 if (best == NULL)
250 return (NULL);
251 else {
252 ret_str = JLI_MemAlloc(JLI_StrLen(dirname) + JLI_StrLen(best) + 2);
253 sprintf(ret_str, "%s/%s", dirname, best);
254 JLI_MemFree(best);
255 return (ret_str);
256 }
257 }
258
259 /*
260 * This is the global entry point. It examines the host for the optimal
261 * JRE to be used by scanning a set of directories. The set of directories
262 * is platform dependent and can be overridden by the environment
263 * variable JAVA_VERSION_PATH.
264 *
265 * This routine itself simply determines the set of appropriate
266 * directories before passing control onto ProcessDir().
267 */
268 char*
269 LocateJRE(manifest_info* info)
270 {
271 char *path;
272 char *home;
273 char *target = NULL;
274 char *dp;
275 char *cp;
276
277 /*
278 * Start by getting JAVA_VERSION_PATH
279 */
280 if (info->jre_restrict_search) {
281 path = JLI_StringDup(system_dir);
282 } else if ((path = getenv("JAVA_VERSION_PATH")) != NULL) {
283 path = JLI_StringDup(path);
284 } else {
285 if ((home = getenv("HOME")) != NULL) {
286 path = (char *)JLI_MemAlloc(JLI_StrLen(home) + \
287 JLI_StrLen(system_dir) + JLI_StrLen(user_dir) + 2);
288 sprintf(path, "%s%s:%s", home, user_dir, system_dir);
289 } else {
290 path = JLI_StringDup(system_dir);
291 }
292 }
293
294 /*
295 * Step through each directory on the path. Terminate the scan with
296 * the first directory with an acceptable JRE.
297 */
298 cp = dp = path;
299 while (dp != NULL) {
300 cp = JLI_StrChr(dp, (int)':');
301 if (cp != NULL)
302 *cp = '\0';
303 if ((target = ProcessDir(info, dp)) != NULL)
304 break;
305 dp = cp;
306 if (dp != NULL)
307 dp++;
308 }
309 JLI_MemFree(path);
310 return (target);
311 }
312
313 /*
314 * Given a path to a jre to execute, this routine checks if this process
315 * is indeed that jre. If not, it exec's that jre.
316 *
317 * We want to actually check the paths rather than just the version string
318 * built into the executable, so that given version specification (and
319 * JAVA_VERSION_PATH) will yield the exact same Java environment, regardless
320 * of the version of the arbitrary launcher we start with.
321 */
322 void
323 ExecJRE(char *jre, char **argv)
324 {
325 char wanted[PATH_MAX];
326 const char* progname = GetProgramName();
327 const char* execname = NULL;
328
329 /*
330 * Resolve the real path to the directory containing the selected JRE.
331 */
332 if (realpath(jre, wanted) == NULL) {
333 JLI_ReportErrorMessage(JRE_ERROR9, jre);
334 exit(1);
335 }
336
337 /*
338 * Resolve the real path to the currently running launcher.
339 */
340 SetExecname(argv);
341 execname = GetExecName();
342 if (execname == NULL) {
343 JLI_ReportErrorMessage(JRE_ERROR10);
344 exit(1);
345 }
346
347 /*
348 * If the path to the selected JRE directory is a match to the initial
349 * portion of the path to the currently executing JRE, we have a winner!
350 * If so, just return.
351 */
352 if (JLI_StrNCmp(wanted, execname, JLI_StrLen(wanted)) == 0)
353 return; /* I am the droid you were looking for */
354
355
356 /*
357 * This should never happen (because of the selection code in SelectJRE),
358 * but check for "impossibly" long path names just because buffer overruns
359 * can be so deadly.
360 */
361 if (JLI_StrLen(wanted) + JLI_StrLen(progname) + 6 > PATH_MAX) {
362 JLI_ReportErrorMessage(JRE_ERROR11);
363 exit(1);
364 }
365
366 /*
367 * Construct the path and exec it.
368 */
369 (void)JLI_StrCat(JLI_StrCat(wanted, "/bin/"), progname);
370 argv[0] = JLI_StringDup(progname);
371 if (JLI_IsTraceLauncher()) {
372 int i;
373 printf("ReExec Command: %s (%s)\n", wanted, argv[0]);
374 printf("ReExec Args:");
375 for (i = 1; argv[i] != NULL; i++)
376 printf(" %s", argv[i]);
377 printf("\n");
378 }
379 JLI_TraceLauncher("TRACER_MARKER:About to EXEC\n");
380 (void)fflush(stdout);
381 (void)fflush(stderr);
382 execv(wanted, argv);
383 JLI_ReportErrorMessageSys(JRE_ERROR12, wanted);
384 exit(1);
385 }
386
387 /*
388 * "Borrowed" from Solaris 10 where the unsetenv() function is being added
389 * to libc thanks to SUSv3 (Standard Unix Specification, version 3). As
390 * such, in the fullness of time this will appear in libc on all relevant
391 * Solaris/Linux platforms and maybe even the Windows platform. At that
392 * time, this stub can be removed.
393 *
394 * This implementation removes the environment locking for multithreaded
395 * applications. (We don't have access to these mutexes within libc and
396 * the launcher isn't multithreaded.) Note that what remains is platform
397 * independent, because it only relies on attributes that a POSIX environment
398 * defines.
399 *
400 * Returns 0 on success, -1 on failure.
401 *
402 * Also removed was the setting of errno. The only value of errno set
403 * was EINVAL ("Invalid Argument").
404 */
405
406 /*
407 * s1(environ) is name=value
408 * s2(name) is name(not the form of name=value).
409 * if names match, return value of 1, else return 0
410 */
411 static int
412 match_noeq(const char *s1, const char *s2)
413 {
414 while (*s1 == *s2++) {
415 if (*s1++ == '=')
416 return (1);
417 }
418 if (*s1 == '=' && s2[-1] == '\0')
419 return (1);
420 return (0);
421 }
422
423 /*
424 * added for SUSv3 standard
425 *
426 * Delete entry from environ.
427 * Do not free() memory! Other threads may be using it.
428 * Keep it around forever.
429 */
430 static int
431 borrowed_unsetenv(const char *name)
432 {
433 long idx; /* index into environ */
434
435 if (name == NULL || *name == '\0' ||
436 JLI_StrChr(name, '=') != NULL) {
437 return (-1);
438 }
439
440 for (idx = 0; environ[idx] != NULL; idx++) {
441 if (match_noeq(environ[idx], name))
442 break;
443 }
444 if (environ[idx] == NULL) {
445 /* name not found but still a success */
446 return (0);
447 }
448 /* squeeze up one entry */
449 do {
450 environ[idx] = environ[idx+1];
451 } while (environ[++idx] != NULL);
452
453 return (0);
454 }
455 /* --- End of "borrowed" code --- */
456
457 /*
458 * Wrapper for unsetenv() function.
459 */
460 int
461 UnsetEnv(char *name)
462 {
463 return(borrowed_unsetenv(name));
464 }
465
466 const char *
467 jlong_format_specifier() {
468 return "%lld";
469 }
470
471 jboolean
472 IsJavaw()
473 {
474 /* noop on UNIX */
475 return JNI_FALSE;
476 }
477
478 void
479 InitLauncher(jboolean javaw)
480 {
481 JLI_SetTraceLauncher();
482 }
483
484 /*
485 * The implementation for finding classes from the bootstrap
486 * class loader, refer to java.h
487 */
488 static FindClassFromBootLoader_t *findBootClass = NULL;
489
490 jclass
491 FindBootStrapClass(JNIEnv *env, const char* classname)
492 {
493 if (findBootClass == NULL) {
494 findBootClass = (FindClassFromBootLoader_t *)dlsym(RTLD_DEFAULT,
495 "JVM_FindClassFromBootLoader");
496 if (findBootClass == NULL) {
497 JLI_ReportErrorMessage(DLL_ERROR4,
498 "JVM_FindClassFromBootLoader");
499 return NULL;
500 }
501 }
502 return findBootClass(env, classname);
503 }
504
505 StdArg
506 *JLI_GetStdArgs()
507 {
508 return NULL;
509 }
510
511 int
512 JLI_GetStdArgc() {
513 return 0;
514 }
515
516 jobjectArray
517 CreateApplicationArgs(JNIEnv *env, char **strv, int argc)
518 {
519 return NewPlatformStringArray(env, strv, argc);
520 }