1 /*
2 * Copyright (c) 1999, 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
26 #include <stdlib.h>
27 #include <stdio.h>
28 #include <strings.h>
29 #include <time.h>
30 #include <limits.h>
31 #include <errno.h>
32 #include <stddef.h>
33 #include <sys/stat.h>
34 #include <sys/types.h>
35 #include <string.h>
36 #include <dirent.h>
37 #include <unistd.h>
38 #ifdef __solaris__
39 #include <libscf.h>
40 #endif
41
42 #include "jvm.h"
43
44 #define SKIP_SPACE(p) while (*p == ' ' || *p == '\t') p++;
45
46 #if !defined(__solaris__) || defined(__sparcv9) || defined(amd64)
47 #define fileopen fopen
48 #define filegets fgets
49 #define fileclose fclose
50 #endif
51
52 #if defined(__linux__) || defined(_ALLBSD_SOURCE)
53
54
55 static const char *ETC_TIMEZONE_FILE = "/etc/timezone";
56 static const char *ZONEINFO_DIR = "/usr/share/zoneinfo";
57 static const char *DEFAULT_ZONEINFO_FILE = "/etc/localtime";
58 #else
59 static const char *SYS_INIT_FILE = "/etc/default/init";
60 static const char *ZONEINFO_DIR = "/usr/share/lib/zoneinfo";
61 static const char *DEFAULT_ZONEINFO_FILE = "/usr/share/lib/zoneinfo/localtime";
62 #endif /*__linux__*/
63
64 /*
65 * Returns a pointer to the zone ID portion of the given zoneinfo file
66 * name, or NULL if the given string doesn't contain "zoneinfo/".
67 */
68 static char *
69 getZoneName(char *str)
70 {
71 static const char *zidir = "zoneinfo/";
72
73 char *pos = strstr((const char *)str, zidir);
74 if (pos == NULL) {
75 return NULL;
76 }
77 return pos + strlen(zidir);
78 }
79
80 /*
81 * Returns a path name created from the given 'dir' and 'name' under
82 * UNIX. This function allocates memory for the pathname calling
83 * malloc(). NULL is returned if malloc() fails.
84 */
85 static char *
86 getPathName(const char *dir, const char *name) {
87 char *path;
88
89 path = (char *) malloc(strlen(dir) + strlen(name) + 2);
90 if (path == NULL) {
91 return NULL;
92 }
93 return strcat(strcat(strcpy(path, dir), "/"), name);
94 }
95
96 /*
97 * Scans the specified directory and its subdirectories to find a
98 * zoneinfo file which has the same content as /etc/localtime on Linux
99 * or /usr/share/lib/zoneinfo/localtime on Solaris given in 'buf'.
100 * If file is symbolic link, then the contents it points to are in buf.
101 * Returns a zone ID if found, otherwise, NULL is returned.
102 */
103 static char *
104 findZoneinfoFile(char *buf, size_t size, const char *dir)
105 {
106 DIR *dirp = NULL;
107 struct stat statbuf;
108 struct dirent *dp = NULL;
109 struct dirent *entry = NULL;
110 char *pathname = NULL;
111 int fd = -1;
112 char *dbuf = NULL;
113 char *tz = NULL;
114
115 dirp = opendir(dir);
116 if (dirp == NULL) {
117 return NULL;
118 }
119
120 entry = (struct dirent *) malloc((size_t) pathconf(dir, _PC_NAME_MAX));
121 if (entry == NULL) {
122 (void) closedir(dirp);
123 return NULL;
124 }
125
126 #if defined(__linux__) || defined(MACOSX) || (defined(__solaris__) \
127 && (defined(_POSIX_PTHREAD_SEMANTICS) || defined(_LP64)))
128 while (readdir_r(dirp, entry, &dp) == 0 && dp != NULL) {
129 #else
130 while ((dp = readdir_r(dirp, entry)) != NULL) {
131 #endif
132
133 /*
134 * Skip '.' and '..' (and possibly other .* files)
135 */
136 if (dp->d_name[0] == '.') {
137 continue;
138 }
139
140 /*
141 * Skip "ROC", "posixrules", and "localtime".
142 */
143 if ((strcmp(dp->d_name, "ROC") == 0)
144 || (strcmp(dp->d_name, "posixrules") == 0)
145 #ifdef __solaris__
146 /*
147 * Skip the "src" and "tab" directories on Solaris.
148 */
149 || (strcmp(dp->d_name, "src") == 0)
150 || (strcmp(dp->d_name, "tab") == 0)
151 #endif
152 || (strcmp(dp->d_name, "localtime") == 0)) {
153 continue;
154 }
155
156 pathname = getPathName(dir, dp->d_name);
157 if (pathname == NULL) {
158 break;
159 }
160 if (stat(pathname, &statbuf) == -1) {
161 break;
162 }
163
164 if (S_ISDIR(statbuf.st_mode)) {
165 tz = findZoneinfoFile(buf, size, pathname);
166 if (tz != NULL) {
167 break;
168 }
169 } else if (S_ISREG(statbuf.st_mode) && (size_t)statbuf.st_size == size) {
170 dbuf = (char *) malloc(size);
171 if (dbuf == NULL) {
172 break;
173 }
174 if ((fd = open(pathname, O_RDONLY)) == -1) {
175 break;
176 }
177 if (read(fd, dbuf, size) != (ssize_t) size) {
178 break;
179 }
180 if (memcmp(buf, dbuf, size) == 0) {
181 tz = getZoneName(pathname);
182 if (tz != NULL) {
183 tz = strdup(tz);
184 }
185 break;
186 }
187 free((void *) dbuf);
188 dbuf = NULL;
189 (void) close(fd);
190 fd = -1;
191 }
192 free((void *) pathname);
193 pathname = NULL;
194 }
195
196 if (entry != NULL) {
197 free((void *) entry);
198 }
199 if (dirp != NULL) {
200 (void) closedir(dirp);
201 }
202 if (pathname != NULL) {
203 free((void *) pathname);
204 }
205 if (fd != -1) {
206 (void) close(fd);
207 }
208 if (dbuf != NULL) {
209 free((void *) dbuf);
210 }
211 return tz;
212 }
213
214 #if defined(__linux__) || defined(MACOSX)
215
216 /*
217 * Performs Linux specific mapping and returns a zone ID
218 * if found. Otherwise, NULL is returned.
219 */
220 static char *
221 getPlatformTimeZoneID()
222 {
223 struct stat statbuf;
224 char *tz = NULL;
225 FILE *fp;
226 int fd;
227 char *buf;
228 size_t size;
229
230 #ifdef __linux__
231 /*
232 * Try reading the /etc/timezone file for Debian distros. There's
233 * no spec of the file format available. This parsing assumes that
234 * there's one line of an Olson tzid followed by a '\n', no
235 * leading or trailing spaces, no comments.
236 */
237 if ((fp = fopen(ETC_TIMEZONE_FILE, "r")) != NULL) {
238 char line[256];
239
240 if (fgets(line, sizeof(line), fp) != NULL) {
241 char *p = strchr(line, '\n');
242 if (p != NULL) {
243 *p = '\0';
244 }
245 if (strlen(line) > 0) {
246 tz = strdup(line);
247 }
248 }
249 (void) fclose(fp);
250 if (tz != NULL) {
251 return tz;
252 }
253 }
254 #endif /* __linux__ */
255
256 /*
257 * Next, try /etc/localtime to find the zone ID.
258 */
259 if (lstat(DEFAULT_ZONEINFO_FILE, &statbuf) == -1) {
260 return NULL;
261 }
262
263 /*
264 * If it's a symlink, get the link name and its zone ID part. (The
265 * older versions of timeconfig created a symlink as described in
266 * the Red Hat man page. It was changed in 1999 to create a copy
267 * of a zoneinfo file. It's no longer possible to get the zone ID
268 * from /etc/localtime.)
269 */
270 if (S_ISLNK(statbuf.st_mode)) {
271 char linkbuf[PATH_MAX+1];
272 int len;
273
274 if ((len = readlink(DEFAULT_ZONEINFO_FILE, linkbuf, sizeof(linkbuf)-1)) == -1) {
275 jio_fprintf(stderr, (const char *) "can't get a symlink of %s\n",
276 DEFAULT_ZONEINFO_FILE);
277 return NULL;
278 }
279 linkbuf[len] = '\0';
280 tz = getZoneName(linkbuf);
281 if (tz != NULL) {
282 tz = strdup(tz);
283 return tz;
284 }
285 }
286
287 /*
288 * If it's a regular file, we need to find out the same zoneinfo file
289 * that has been copied as /etc/localtime.
290 * If initial symbolic link resolution failed, we should treat target
291 * file as a regular file.
292 */
293 if ((fd = open(DEFAULT_ZONEINFO_FILE, O_RDONLY)) == -1) {
294 return NULL;
295 }
296 if (fstat(fd, &statbuf) == -1) {
297 return NULL;
298 }
299 size = (size_t) statbuf.st_size;
300 buf = (char *) malloc(size);
301 if (buf == NULL) {
302 return NULL;
303 }
304
305 if (read(fd, buf, size) != (ssize_t) size) {
306 (void) close(fd);
307 free((void *) buf);
308 return NULL;
309 }
310 (void) close(fd);
311
312 tz = findZoneinfoFile(buf, size, ZONEINFO_DIR);
313 free((void *) buf);
314 return tz;
315 }
316 #else
317 #ifdef __solaris__
318 #if !defined(__sparcv9) && !defined(amd64)
319
320 /*
321 * Those file* functions mimic the UNIX stream io functions. This is
322 * because of the limitation of the number of open files on Solaris
323 * (32-bit mode only) due to the System V ABI.
324 */
325
326 #define BUFFER_SIZE 4096
327
328 static struct iobuffer {
329 int magic; /* -1 to distinguish from the real FILE */
330 int fd; /* file descriptor */
331 char *buffer; /* pointer to buffer */
332 char *ptr; /* current read pointer */
333 char *endptr; /* end pointer */
334 };
335
336 static int
337 fileclose(FILE *stream)
338 {
339 struct iobuffer *iop = (struct iobuffer *) stream;
340
341 if (iop->magic != -1) {
342 return fclose(stream);
343 }
344
345 if (iop == NULL) {
346 return 0;
347 }
348 close(iop->fd);
349 free((void *)iop->buffer);
350 free((void *)iop);
351 return 0;
352 }
353
354 static FILE *
355 fileopen(const char *fname, const char *fmode)
356 {
357 FILE *fp;
358 int fd;
359 struct iobuffer *iop;
360
361 if ((fp = fopen(fname, fmode)) != NULL) {
362 return fp;
363 }
364
365 /*
366 * It assumes read open.
367 */
368 if ((fd = open(fname, O_RDONLY)) == -1) {
369 return NULL;
370 }
371
372 /*
373 * Allocate struct iobuffer and its buffer
374 */
375 iop = malloc(sizeof(struct iobuffer));
376 if (iop == NULL) {
377 (void) close(fd);
378 errno = ENOMEM;
379 return NULL;
380 }
381 iop->magic = -1;
382 iop->fd = fd;
383 iop->buffer = malloc(BUFFER_SIZE);
384 if (iop->buffer == NULL) {
385 (void) close(fd);
386 free((void *) iop);
387 errno = ENOMEM;
388 return NULL;
389 }
390 iop->ptr = iop->buffer;
391 iop->endptr = iop->buffer;
392 return (FILE *)iop;
393 }
394
395 /*
396 * This implementation assumes that n is large enough and the line
397 * separator is '\n'.
398 */
399 static char *
400 filegets(char *s, int n, FILE *stream)
401 {
402 struct iobuffer *iop = (struct iobuffer *) stream;
403 char *p;
404
405 if (iop->magic != -1) {
406 return fgets(s, n, stream);
407 }
408
409 p = s;
410 for (;;) {
411 char c;
412
413 if (iop->ptr == iop->endptr) {
414 ssize_t len;
415
416 if ((len = read(iop->fd, (void *)iop->buffer, BUFFER_SIZE)) == -1) {
417 return NULL;
418 }
419 if (len == 0) {
420 *p = 0;
421 if (s == p) {
422 return NULL;
423 }
424 return s;
425 }
426 iop->ptr = iop->buffer;
427 iop->endptr = iop->buffer + len;
428 }
429 c = *iop->ptr++;
430 *p++ = c;
431 if ((p - s) == (n - 1)) {
432 *p = 0;
433 return s;
434 }
435 if (c == '\n') {
436 *p = 0;
437 return s;
438 }
439 }
440 /*NOTREACHED*/
441 }
442 #endif /* not __sparcv9 */
443
444
445 /*
446 * Performs Solaris dependent mapping. Returns a zone ID if
447 * found. Otherwise, NULL is returned. Solaris libc looks up
448 * "/etc/default/init" to get the default TZ value if TZ is not defined
449 * as an environment variable.
450 */
451 static char *
452 getPlatformTimeZoneID()
453 {
454 char *tz = NULL;
455 FILE *fp;
456
457 /*
458 * Try the TZ entry in /etc/default/init.
459 */
460 if ((fp = fileopen(SYS_INIT_FILE, "r")) != NULL) {
461 char line[256];
462 char quote = '\0';
463
464 while (filegets(line, sizeof(line), fp) != NULL) {
465 char *p = line;
466 char *s;
467 char c;
468
469 /* quick check for comment lines */
470 if (*p == '#') {
471 continue;
472 }
473 if (strncmp(p, "TZ=", 3) == 0) {
474 p += 3;
475 SKIP_SPACE(p);
476 c = *p;
477 if (c == '"' || c == '\'') {
478 quote = c;
479 p++;
480 }
481
482 /*
483 * PSARC/2001/383: quoted string support
484 */
485 for (s = p; (c = *s) != '\0' && c != '\n'; s++) {
486 /* No '\\' is supported here. */
487 if (c == quote) {
488 quote = '\0';
489 break;
490 }
491 if (c == ' ' && quote == '\0') {
492 break;
493 }
494 }
495 if (quote != '\0') {
496 jio_fprintf(stderr, "ZoneInfo: unterminated time zone name in /etc/TIMEZONE\n");
497 }
498 *s = '\0';
499 tz = strdup(p);
500 break;
501 }
502 }
503 (void) fileclose(fp);
504 }
505 return tz;
506 }
507
508 #define TIMEZONE_FMRI "svc:/system/timezone:default"
509 #define TIMEZONE_PG "timezone"
510 #define LOCALTIME_PROP "localtime"
511
512 static void
513 cleanupScf(scf_handle_t *h,
514 scf_snapshot_t *snap,
515 scf_instance_t *inst,
516 scf_propertygroup_t *pg,
517 scf_property_t *prop,
518 scf_value_t *val,
519 char *buf) {
520 if (buf != NULL) {
521 free(buf);
522 }
523 if (snap != NULL) {
524 scf_snapshot_destroy(snap);
525 }
526 if (val != NULL) {
527 scf_value_destroy(val);
528 }
529 if (prop != NULL) {
530 scf_property_destroy(prop);
531 }
532 if (pg != NULL) {
533 scf_pg_destroy(pg);
534 }
535 if (inst != NULL) {
536 scf_instance_destroy(inst);
537 }
538 if (h != NULL) {
539 scf_handle_destroy(h);
540 }
541 }
542
543 /*
544 * Retruns a zone ID of Solaris when the TZ value is "localtime".
545 * First, it tries scf. If scf fails, it looks for the same file as
546 * /usr/share/lib/zoneinfo/localtime under /usr/share/lib/zoneinfo/.
547 */
548 static char *
549 getSolarisDefaultZoneID() {
550 char *tz = NULL;
551 struct stat statbuf;
552 size_t size;
553 char *buf;
554 int fd;
555 /* scf specific variables */
556 scf_handle_t *h = NULL;
557 scf_snapshot_t *snap = NULL;
558 scf_instance_t *inst = NULL;
559 scf_propertygroup_t *pg = NULL;
560 scf_property_t *prop = NULL;
561 scf_value_t *val = NULL;
562
563 if ((h = scf_handle_create(SCF_VERSION)) != NULL
564 && scf_handle_bind(h) == 0
565 && (inst = scf_instance_create(h)) != NULL
566 && (snap = scf_snapshot_create(h)) != NULL
567 && (pg = scf_pg_create(h)) != NULL
568 && (prop = scf_property_create(h)) != NULL
569 && (val = scf_value_create(h)) != NULL
570 && scf_handle_decode_fmri(h, TIMEZONE_FMRI, NULL, NULL, inst,
571 NULL, NULL, SCF_DECODE_FMRI_REQUIRE_INSTANCE) == 0
572 && scf_instance_get_snapshot(inst, "running", snap) == 0
573 && scf_instance_get_pg_composed(inst, snap, TIMEZONE_PG, pg) == 0
574 && scf_pg_get_property(pg, LOCALTIME_PROP, prop) == 0
575 && scf_property_get_value(prop, val) == 0) {
576 ssize_t len;
577
578 /* Gets the length of the zone ID string */
579 len = scf_value_get_astring(val, NULL, 0);
580 if (len != -1) {
581 tz = malloc(++len); /* +1 for a null byte */
582 if (tz != NULL && scf_value_get_astring(val, tz, len) != -1) {
583 cleanupScf(h, snap, inst, pg, prop, val, NULL);
584 return tz;
585 }
586 }
587 }
588 cleanupScf(h, snap, inst, pg, prop, val, tz);
589
590 if (stat(DEFAULT_ZONEINFO_FILE, &statbuf) == -1) {
591 return NULL;
592 }
593 size = (size_t) statbuf.st_size;
594 buf = malloc(size);
595 if (buf == NULL) {
596 return NULL;
597 }
598 if ((fd = open(DEFAULT_ZONEINFO_FILE, O_RDONLY)) == -1) {
599 free((void *) buf);
600 return NULL;
601 }
602
603 if (read(fd, buf, size) != (ssize_t) size) {
604 (void) close(fd);
605 free((void *) buf);
606 return NULL;
607 }
608 (void) close(fd);
609 tz = findZoneinfoFile(buf, size, ZONEINFO_DIR);
610 free((void *) buf);
611 return tz;
612 }
613 #endif /*__solaris__*/
614 #endif /*__linux__*/
615
616 /*
617 * findJavaTZ_md() maps platform time zone ID to Java time zone ID
618 * using <java_home>/lib/tzmappings. If the TZ value is not found, it
619 * trys some libc implementation dependent mappings. If it still
620 * can't map to a Java time zone ID, it falls back to the GMT+/-hh:mm
621 * form. `country', which can be null, is not used for UNIX platforms.
622 */
623 /*ARGSUSED1*/
624 char *
625 findJavaTZ_md(const char *java_home_dir, const char *country)
626 {
627 char *tz;
628 char *javatz = NULL;
629 char *freetz = NULL;
630
631 tz = getenv("TZ");
632
633 #if defined(__linux__) || defined(_ALLBSD_SOURCE)
634 if (tz == NULL) {
635 #else
636 #ifdef __solaris__
637 if (tz == NULL || *tz == '\0') {
638 #endif
639 #endif
640 tz = getPlatformTimeZoneID();
641 freetz = tz;
642 }
643
644 /*
645 * Remove any preceding ':'
646 */
647 if (tz != NULL && *tz == ':') {
648 tz++;
649 }
650
651 #ifdef __solaris__
652 if (strcmp(tz, "localtime") == 0) {
653 tz = getSolarisDefaultZoneID();
654 freetz = tz;
655 }
656 #endif
657
658 if (tz != NULL) {
659 #ifdef __linux__
660 /*
661 * Ignore "posix/" prefix.
662 */
663 if (strncmp(tz, "posix/", 6) == 0) {
664 tz += 6;
665 }
666 #endif
667 javatz = strdup(tz);
668 if (freetz != NULL) {
669 free((void *) freetz);
670 }
671 }
672 return javatz;
673 }
674 /**
675 * Returns a GMT-offset-based zone ID. (e.g., "GMT-08:00")
676 */
677
678 #ifdef MACOSX
679
680 char *
681 getGMTOffsetID()
682 {
683 time_t offset;
684 char sign, buf[32];
685 struct tm *local_tm;
686 time_t clock;
687 time_t currenttime;
688
689 clock = time(NULL);
690 tzset();
691 local_tm = localtime(&clock);
692 if (local_tm->tm_gmtoff >= 0) {
693 offset = (time_t) local_tm->tm_gmtoff;
694 sign = "+";
695 } else {
696 offset = (time_t) -local_tm->tm_gmtoff;
697 sign = "-";
698 }
699 sprintf(buf, (const char *)"GMT%c%02d:%02d",
700 sign, (int)(offset/3600), (int)((offset%3600)/60));
701 return strdup(buf);
702 }
703 #else
704
705 char *
706 getGMTOffsetID()
707 {
708 time_t offset;
709 char sign, buf[32];
710 #ifdef __solaris__
711 struct tm localtm;
712 time_t currenttime;
713
714 currenttime = time(NULL);
715 if (localtime_r(¤ttime, &localtm) == NULL) {
716 return NULL;
717 }
718
719 offset = localtm.tm_isdst ? altzone : timezone;
720 #else
721 offset = timezone;
722 #endif /*__linux__*/
723
724 if (offset == 0) {
725 return strdup("GMT");
726 }
727
728 /* Note that the time offset direction is opposite. */
729 if (offset > 0) {
730 sign = '-';
731 } else {
732 offset = -offset;
733 sign = '+';
734 }
735 sprintf(buf, (const char *)"GMT%c%02d:%02d",
736 sign, (int)(offset/3600), (int)((offset%3600)/60));
737 return strdup(buf);
738 }
739 #endif /* MACOSX */