1 /*
2 * Copyright (c) 1999, 2011, 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 (most likely a symbolic link)
100 * on Solaris given in 'buf'. Returns a zone ID if found, otherwise,
101 * 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 }
284 return tz;
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 */
291 size = (size_t) statbuf.st_size;
292 buf = (char *) malloc(size);
293 if (buf == NULL) {
294 return NULL;
295 }
296 if ((fd = open(DEFAULT_ZONEINFO_FILE, O_RDONLY)) == -1) {
297 free((void *) buf);
298 return NULL;
299 }
300
301 if (read(fd, buf, size) != (ssize_t) size) {
302 (void) close(fd);
303 free((void *) buf);
304 return NULL;
305 }
306 (void) close(fd);
307
308 tz = findZoneinfoFile(buf, size, ZONEINFO_DIR);
309 free((void *) buf);
310 return tz;
311 }
312 #else
313 #ifdef __solaris__
314 #if !defined(__sparcv9) && !defined(amd64)
315
316 /*
317 * Those file* functions mimic the UNIX stream io functions. This is
318 * because of the limitation of the number of open files on Solaris
319 * (32-bit mode only) due to the System V ABI.
320 */
321
322 #define BUFFER_SIZE 4096
323
324 static struct iobuffer {
325 int magic; /* -1 to distinguish from the real FILE */
326 int fd; /* file descriptor */
327 char *buffer; /* pointer to buffer */
328 char *ptr; /* current read pointer */
329 char *endptr; /* end pointer */
330 };
331
332 static int
333 fileclose(FILE *stream)
334 {
335 struct iobuffer *iop = (struct iobuffer *) stream;
336
337 if (iop->magic != -1) {
338 return fclose(stream);
339 }
340
341 if (iop == NULL) {
342 return 0;
343 }
344 close(iop->fd);
345 free((void *)iop->buffer);
346 free((void *)iop);
347 return 0;
348 }
349
350 static FILE *
351 fileopen(const char *fname, const char *fmode)
352 {
353 FILE *fp;
354 int fd;
355 struct iobuffer *iop;
356
357 if ((fp = fopen(fname, fmode)) != NULL) {
358 return fp;
359 }
360
361 /*
362 * It assumes read open.
363 */
364 if ((fd = open(fname, O_RDONLY)) == -1) {
365 return NULL;
366 }
367
368 /*
369 * Allocate struct iobuffer and its buffer
370 */
371 iop = malloc(sizeof(struct iobuffer));
372 if (iop == NULL) {
373 (void) close(fd);
374 errno = ENOMEM;
375 return NULL;
376 }
377 iop->magic = -1;
378 iop->fd = fd;
379 iop->buffer = malloc(BUFFER_SIZE);
380 if (iop->buffer == NULL) {
381 (void) close(fd);
382 free((void *) iop);
383 errno = ENOMEM;
384 return NULL;
385 }
386 iop->ptr = iop->buffer;
387 iop->endptr = iop->buffer;
388 return (FILE *)iop;
389 }
390
391 /*
392 * This implementation assumes that n is large enough and the line
393 * separator is '\n'.
394 */
395 static char *
396 filegets(char *s, int n, FILE *stream)
397 {
398 struct iobuffer *iop = (struct iobuffer *) stream;
399 char *p;
400
401 if (iop->magic != -1) {
402 return fgets(s, n, stream);
403 }
404
405 p = s;
406 for (;;) {
407 char c;
408
409 if (iop->ptr == iop->endptr) {
410 ssize_t len;
411
412 if ((len = read(iop->fd, (void *)iop->buffer, BUFFER_SIZE)) == -1) {
413 return NULL;
414 }
415 if (len == 0) {
416 *p = 0;
417 if (s == p) {
418 return NULL;
419 }
420 return s;
421 }
422 iop->ptr = iop->buffer;
423 iop->endptr = iop->buffer + len;
424 }
425 c = *iop->ptr++;
426 *p++ = c;
427 if ((p - s) == (n - 1)) {
428 *p = 0;
429 return s;
430 }
431 if (c == '\n') {
432 *p = 0;
433 return s;
434 }
435 }
436 /*NOTREACHED*/
437 }
438 #endif /* not __sparcv9 */
439
440
441 /*
442 * Performs Solaris dependent mapping. Returns a zone ID if
443 * found. Otherwise, NULL is returned. Solaris libc looks up
444 * "/etc/default/init" to get the default TZ value if TZ is not defined
445 * as an environment variable.
446 */
447 static char *
448 getPlatformTimeZoneID()
449 {
450 char *tz = NULL;
451 FILE *fp;
452
453 /*
454 * Try the TZ entry in /etc/default/init.
455 */
456 if ((fp = fileopen(SYS_INIT_FILE, "r")) != NULL) {
457 char line[256];
458 char quote = '\0';
459
460 while (filegets(line, sizeof(line), fp) != NULL) {
461 char *p = line;
462 char *s;
463 char c;
464
465 /* quick check for comment lines */
466 if (*p == '#') {
467 continue;
468 }
469 if (strncmp(p, "TZ=", 3) == 0) {
470 p += 3;
471 SKIP_SPACE(p);
472 c = *p;
473 if (c == '"' || c == '\'') {
474 quote = c;
475 p++;
476 }
477
478 /*
479 * PSARC/2001/383: quoted string support
480 */
481 for (s = p; (c = *s) != '\0' && c != '\n'; s++) {
482 /* No '\\' is supported here. */
483 if (c == quote) {
484 quote = '\0';
485 break;
486 }
487 if (c == ' ' && quote == '\0') {
488 break;
489 }
490 }
491 if (quote != '\0') {
492 jio_fprintf(stderr, "ZoneInfo: unterminated time zone name in /etc/TIMEZONE\n");
493 }
494 *s = '\0';
495 tz = strdup(p);
496 break;
497 }
498 }
499 (void) fileclose(fp);
500 }
501 return tz;
502 }
503
504 #define TIMEZONE_FMRI "svc:/system/timezone:default"
505 #define TIMEZONE_PG "timezone"
506 #define LOCALTIME_PROP "localtime"
507
508 static void
509 cleanupScf(scf_handle_t *h,
510 scf_snapshot_t *snap,
511 scf_instance_t *inst,
512 scf_propertygroup_t *pg,
513 scf_property_t *prop,
514 scf_value_t *val,
515 char *buf) {
516 if (buf != NULL) {
517 free(buf);
518 }
519 if (snap != NULL) {
520 scf_snapshot_destroy(snap);
521 }
522 if (val != NULL) {
523 scf_value_destroy(val);
524 }
525 if (prop != NULL) {
526 scf_property_destroy(prop);
527 }
528 if (pg != NULL) {
529 scf_pg_destroy(pg);
530 }
531 if (inst != NULL) {
532 scf_instance_destroy(inst);
533 }
534 if (h != NULL) {
535 scf_handle_destroy(h);
536 }
537 }
538
539 /*
540 * Retruns a zone ID of Solaris when the TZ value is "localtime".
541 * First, it tries scf. If scf fails, it looks for the same file as
542 * /usr/share/lib/zoneinfo/localtime under /usr/share/lib/zoneinfo/.
543 */
544 static char *
545 getSolarisDefaultZoneID() {
546 char *tz = NULL;
547 struct stat statbuf;
548 size_t size;
549 char *buf;
550 int fd;
551 /* scf specific variables */
552 scf_handle_t *h = NULL;
553 scf_snapshot_t *snap = NULL;
554 scf_instance_t *inst = NULL;
555 scf_propertygroup_t *pg = NULL;
556 scf_property_t *prop = NULL;
557 scf_value_t *val = NULL;
558
559 if ((h = scf_handle_create(SCF_VERSION)) != NULL
560 && scf_handle_bind(h) == 0
561 && (inst = scf_instance_create(h)) != NULL
562 && (snap = scf_snapshot_create(h)) != NULL
563 && (pg = scf_pg_create(h)) != NULL
564 && (prop = scf_property_create(h)) != NULL
565 && (val = scf_value_create(h)) != NULL
566 && scf_handle_decode_fmri(h, TIMEZONE_FMRI, NULL, NULL, inst,
567 NULL, NULL, SCF_DECODE_FMRI_REQUIRE_INSTANCE) == 0
568 && scf_instance_get_snapshot(inst, "running", snap) == 0
569 && scf_instance_get_pg_composed(inst, snap, TIMEZONE_PG, pg) == 0
570 && scf_pg_get_property(pg, LOCALTIME_PROP, prop) == 0
571 && scf_property_get_value(prop, val) == 0) {
572 ssize_t len;
573
574 /* Gets the length of the zone ID string */
575 len = scf_value_get_astring(val, NULL, 0);
576 if (len != -1) {
577 tz = malloc(++len); /* +1 for a null byte */
578 if (tz != NULL && scf_value_get_astring(val, tz, len) != -1) {
579 cleanupScf(h, snap, inst, pg, prop, val, NULL);
580 return tz;
581 }
582 }
583 }
584 cleanupScf(h, snap, inst, pg, prop, val, tz);
585
586 if (stat(DEFAULT_ZONEINFO_FILE, &statbuf) == -1) {
587 return NULL;
588 }
589 size = (size_t) statbuf.st_size;
590 buf = malloc(size);
591 if (buf == NULL) {
592 return NULL;
593 }
594 if ((fd = open(DEFAULT_ZONEINFO_FILE, O_RDONLY)) == -1) {
595 free((void *) buf);
596 return NULL;
597 }
598
599 if (read(fd, buf, size) != (ssize_t) size) {
600 (void) close(fd);
601 free((void *) buf);
602 return NULL;
603 }
604 (void) close(fd);
605 tz = findZoneinfoFile(buf, size, ZONEINFO_DIR);
606 free((void *) buf);
607 return tz;
608 }
609 #endif /*__solaris__*/
610 #endif /*__linux__*/
611
612 /*
613 * findJavaTZ_md() maps platform time zone ID to Java time zone ID
614 * using <java_home>/lib/tzmappings. If the TZ value is not found, it
615 * trys some libc implementation dependent mappings. If it still
616 * can't map to a Java time zone ID, it falls back to the GMT+/-hh:mm
617 * form. `country', which can be null, is not used for UNIX platforms.
618 */
619 /*ARGSUSED1*/
620 char *
621 findJavaTZ_md(const char *java_home_dir, const char *country)
622 {
623 char *tz;
624 char *javatz = NULL;
625 char *freetz = NULL;
626
627 tz = getenv("TZ");
628
629 #if defined(__linux__) || defined(_ALLBSD_SOURCE)
630 if (tz == NULL) {
631 #else
632 #ifdef __solaris__
633 if (tz == NULL || *tz == '\0') {
634 #endif
635 #endif
636 tz = getPlatformTimeZoneID();
637 freetz = tz;
638 }
639
640 /*
641 * Remove any preceding ':'
642 */
643 if (tz != NULL && *tz == ':') {
644 tz++;
645 }
646
647 #ifdef __solaris__
648 if (strcmp(tz, "localtime") == 0) {
649 tz = getSolarisDefaultZoneID();
650 freetz = tz;
651 }
652 #endif
653
654 if (tz != NULL) {
655 #ifdef __linux__
656 /*
657 * Ignore "posix/" prefix.
658 */
659 if (strncmp(tz, "posix/", 6) == 0) {
660 tz += 6;
661 }
662 #endif
663 javatz = strdup(tz);
664 if (freetz != NULL) {
665 free((void *) freetz);
666 }
667 }
668 return javatz;
669 }
670 /**
671 * Returns a GMT-offset-based zone ID. (e.g., "GMT-08:00")
672 */
673
674 #ifdef MACOSX
675
676 char *
677 getGMTOffsetID()
678 {
679 time_t offset;
680 char sign, buf[32];
681 struct tm *local_tm;
682 time_t clock;
683 time_t currenttime;
684
685 clock = time(NULL);
686 tzset();
687 local_tm = localtime(&clock);
688 if (local_tm->tm_gmtoff >= 0) {
689 offset = (time_t) local_tm->tm_gmtoff;
690 sign = "+";
691 } else {
692 offset = (time_t) -local_tm->tm_gmtoff;
693 sign = "-";
694 }
695 sprintf(buf, (const char *)"GMT%c%02d:%02d",
696 sign, (int)(offset/3600), (int)((offset%3600)/60));
697 return strdup(buf);
698 }
699 #else
700
701 char *
702 getGMTOffsetID()
703 {
704 time_t offset;
705 char sign, buf[32];
706 #ifdef __solaris__
707 struct tm localtm;
708 time_t currenttime;
709
710 currenttime = time(NULL);
711 if (localtime_r(¤ttime, &localtm) == NULL) {
712 return NULL;
713 }
714
715 offset = localtm.tm_isdst ? altzone : timezone;
716 #else
717 offset = timezone;
718 #endif /*__linux__*/
719
720 if (offset == 0) {
721 return strdup("GMT");
722 }
723
724 /* Note that the time offset direction is opposite. */
725 if (offset > 0) {
726 sign = '-';
727 } else {
728 offset = -offset;
729 sign = '+';
730 }
731 sprintf(buf, (const char *)"GMT%c%02d:%02d",
732 sign, (int)(offset/3600), (int)((offset%3600)/60));
733 return strdup(buf);
734 }
735 #endif /* MACOSX */