1 /*-
2 * SPDX-License-Identifier: BSD-3-Clause
3 *
4 * Copyright (c) 1989, 1993, 1994
5 * The Regents of the University of California. All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 * 3. Neither the name of the University nor the names of its contributors
16 * may be used to endorse or promote products derived from this software
17 * without specific prior written permission.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 * SUCH DAMAGE.
30 */
31
32 #ifndef lint
33 static const char copyright[] =
34 "@(#) Copyright (c) 1989, 1993\n\
35 The Regents of the University of California. All rights reserved.\n";
36 #endif
37
38 #if 0
39 #ifndef lint
40 static char sccsid[] = "@(#)calendar.c 8.3 (Berkeley) 3/25/94";
41 #endif
42 #endif
43
44 #include <sys/cdefs.h>
45 #include <sys/param.h>
46 #include <sys/stat.h>
47 #include <sys/wait.h>
48 #include <ctype.h>
49 #include <err.h>
50 #include <errno.h>
51 #include <fcntl.h>
52 #include <libutil.h>
53 #include <locale.h>
54 #include <pwd.h>
55 #include <stdbool.h>
56 #include <stdio.h>
57 #include <stdlib.h>
58 #include <string.h>
59 #include <stringlist.h>
60 #include <time.h>
61 #include <unistd.h>
62
63 #include "pathnames.h"
64 #include "calendar.h"
65
66 enum {
67 T_OK = 0,
68 T_ERR,
69 T_PROCESS,
70 };
71
72 const char *calendarFile = "calendar"; /* default calendar file */
73 static const char *calendarHomes[] = {".calendar", _PATH_INCLUDE_LOCAL, _PATH_INCLUDE}; /* HOME */
74 static const char *calendarNoMail = "nomail";/* don't sent mail if file exist */
75
76 static char path[MAXPATHLEN];
77 static const char *cal_home;
78 static const char *cal_dir;
79 static const char *cal_file;
80 static int cal_line;
81
82 struct fixs neaster, npaskha, ncny, nfullmoon, nnewmoon;
83 struct fixs nmarequinox, nsepequinox, njunsolstice, ndecsolstice;
84
85 static int cal_parse(FILE *in, FILE *out);
86
87 static StringList *definitions = NULL;
88 static struct event *events[MAXCOUNT];
89 static char *extradata[MAXCOUNT];
90
91 static char *
trimlr(char ** buf)92 trimlr(char **buf)
93 {
94 char *walk = *buf;
95 char *sep;
96 char *last;
97
98 while (isspace(*walk))
99 walk++;
100 *buf = walk;
101
102 sep = walk;
103 while (*sep != '\0' && !isspace(*sep))
104 sep++;
105
106 if (*sep != '\0') {
107 last = sep + strlen(sep) - 1;
108 while (last > walk && isspace(*last))
109 last--;
110 *(last+1) = 0;
111 }
112
113 return (sep);
114 }
115
116 static FILE *
cal_fopen(const char * file)117 cal_fopen(const char *file)
118 {
119 static int cwdfd = -1;
120 FILE *fp;
121 char *home = getenv("HOME");
122 unsigned int i;
123 int fd;
124 struct stat sb;
125 static bool warned = false;
126 static char calendarhome[MAXPATHLEN];
127
128 if (home == NULL || *home == '\0') {
129 warnx("Cannot get home directory");
130 return (NULL);
131 }
132
133 /*
134 * On -a runs, we would have done a chdir() earlier on, but we also
135 * shouldn't have used the initial cwd anyways lest we bring
136 * unpredictable behavior upon us.
137 */
138 if (!doall && cwdfd == -1) {
139 cwdfd = open(".", O_DIRECTORY | O_PATH);
140 if (cwdfd == -1)
141 err(1, "open(cwd)");
142 }
143
144 /*
145 * Check $PWD first as documented.
146 */
147 if (cwdfd != -1) {
148 if ((fd = openat(cwdfd, file, O_RDONLY)) != -1) {
149 if ((fp = fdopen(fd, "r")) == NULL)
150 err(1, "fdopen(%s)", file);
151
152 cal_home = NULL;
153 cal_dir = NULL;
154 cal_file = file;
155 return (fp);
156 } else if (errno != ENOENT && errno != ENAMETOOLONG) {
157 err(1, "open(%s)", file);
158 }
159 }
160
161 if (chdir(home) != 0) {
162 warnx("Cannot enter home directory \"%s\"", home);
163 return (NULL);
164 }
165
166 for (i = 0; i < nitems(calendarHomes); i++) {
167 if (snprintf(calendarhome, sizeof (calendarhome), calendarHomes[i],
168 getlocalbase()) >= (int)sizeof (calendarhome))
169 continue;
170
171 if (chdir(calendarhome) != 0)
172 continue;
173
174 if ((fp = fopen(file, "r")) != NULL) {
175 cal_home = home;
176 cal_dir = calendarhome;
177 cal_file = file;
178 return (fp);
179 }
180 }
181
182 warnx("can't open calendar file \"%s\"", file);
183 if (!warned) {
184 snprintf(path, sizeof(path), _PATH_INCLUDE_LOCAL, getlocalbase());
185 if (stat(path, &sb) != 0) {
186 warnx("calendar data files now provided by calendar-data pkg.");
187 warned = true;
188 }
189 }
190
191 return (NULL);
192 }
193
194 static char*
cal_path(void)195 cal_path(void)
196 {
197 static char buffer[MAXPATHLEN + 10];
198
199 if (cal_dir == NULL)
200 snprintf(buffer, sizeof(buffer), "%s", cal_file);
201 else if (cal_dir[0] == '/')
202 snprintf(buffer, sizeof(buffer), "%s/%s", cal_dir, cal_file);
203 else
204 snprintf(buffer, sizeof(buffer), "%s/%s/%s", cal_home, cal_dir, cal_file);
205 return (buffer);
206 }
207
208 #define WARN0(format) \
209 warnx(format " in %s line %d", cal_path(), cal_line)
210 #define WARN1(format, arg1) \
211 warnx(format " in %s line %d", arg1, cal_path(), cal_line)
212
213 static char*
cmptoken(char * line,const char * token)214 cmptoken(char *line, const char* token)
215 {
216 char len = strlen(token);
217
218 if (strncmp(line, token, len) != 0)
219 return NULL;
220 return (line + len);
221 }
222
223 static int
token(char * line,FILE * out,int * skip,int * unskip)224 token(char *line, FILE *out, int *skip, int *unskip)
225 {
226 char *walk, *sep, a, c;
227 const char *this_cal_home;
228 const char *this_cal_dir;
229 const char *this_cal_file;
230 int this_cal_line;
231
232 while (isspace(*line))
233 line++;
234
235 if (cmptoken(line, "endif")) {
236 if (*skip + *unskip == 0) {
237 WARN0("#endif without prior #ifdef or #ifndef");
238 return (T_ERR);
239 }
240 if (*skip > 0)
241 --*skip;
242 else
243 --*unskip;
244
245 return (T_OK);
246 }
247
248 walk = cmptoken(line, "ifdef");
249 if (walk != NULL) {
250 sep = trimlr(&walk);
251
252 if (*walk == '\0') {
253 WARN0("Expecting arguments after #ifdef");
254 return (T_ERR);
255 }
256 if (*sep != '\0') {
257 WARN1("Expecting a single word after #ifdef "
258 "but got \"%s\"", walk);
259 return (T_ERR);
260 }
261
262 if (*skip != 0 ||
263 definitions == NULL || sl_find(definitions, walk) == NULL)
264 ++*skip;
265 else
266 ++*unskip;
267
268 return (T_OK);
269 }
270
271 walk = cmptoken(line, "ifndef");
272 if (walk != NULL) {
273 sep = trimlr(&walk);
274
275 if (*walk == '\0') {
276 WARN0("Expecting arguments after #ifndef");
277 return (T_ERR);
278 }
279 if (*sep != '\0') {
280 WARN1("Expecting a single word after #ifndef "
281 "but got \"%s\"", walk);
282 return (T_ERR);
283 }
284
285 if (*skip != 0 ||
286 (definitions != NULL && sl_find(definitions, walk) != NULL))
287 ++*skip;
288 else
289 ++*unskip;
290
291 return (T_OK);
292 }
293
294 walk = cmptoken(line, "else");
295 if (walk != NULL) {
296 (void)trimlr(&walk);
297
298 if (*walk != '\0') {
299 WARN0("Expecting no arguments after #else");
300 return (T_ERR);
301 }
302 if (*skip + *unskip == 0) {
303 WARN0("#else without prior #ifdef or #ifndef");
304 return (T_ERR);
305 }
306
307 if (*skip == 0) {
308 ++*skip;
309 --*unskip;
310 } else if (*skip == 1) {
311 --*skip;
312 ++*unskip;
313 }
314
315 return (T_OK);
316 }
317
318 if (*skip != 0)
319 return (T_OK);
320
321 walk = cmptoken(line, "include");
322 if (walk != NULL) {
323 (void)trimlr(&walk);
324
325 if (*walk == '\0') {
326 WARN0("Expecting arguments after #include");
327 return (T_ERR);
328 }
329
330 if (*walk != '<' && *walk != '\"') {
331 WARN0("Excecting '<' or '\"' after #include");
332 return (T_ERR);
333 }
334
335 a = *walk == '<' ? '>' : '\"';
336 walk++;
337 c = walk[strlen(walk) - 1];
338
339 if (a != c) {
340 WARN1("Unterminated include expecting '%c'", a);
341 return (T_ERR);
342 }
343 walk[strlen(walk) - 1] = '\0';
344
345 this_cal_home = cal_home;
346 this_cal_dir = cal_dir;
347 this_cal_file = cal_file;
348 this_cal_line = cal_line;
349 if (cal_parse(cal_fopen(walk), out))
350 return (T_ERR);
351 cal_home = this_cal_home;
352 cal_dir = this_cal_dir;
353 cal_file = this_cal_file;
354 cal_line = this_cal_line;
355
356 return (T_OK);
357 }
358
359 walk = cmptoken(line, "define");
360 if (walk != NULL) {
361 if (definitions == NULL)
362 definitions = sl_init();
363 sep = trimlr(&walk);
364 *sep = '\0';
365
366 if (*walk == '\0') {
367 WARN0("Expecting arguments after #define");
368 return (T_ERR);
369 }
370
371 if (sl_find(definitions, walk) == NULL)
372 sl_add(definitions, strdup(walk));
373 return (T_OK);
374 }
375
376 walk = cmptoken(line, "undef");
377 if (walk != NULL) {
378 if (definitions != NULL) {
379 sep = trimlr(&walk);
380
381 if (*walk == '\0') {
382 WARN0("Expecting arguments after #undef");
383 return (T_ERR);
384 }
385 if (*sep != '\0') {
386 WARN1("Expecting a single word after #undef "
387 "but got \"%s\"", walk);
388 return (T_ERR);
389 }
390
391 walk = sl_find(definitions, walk);
392 if (walk != NULL)
393 walk[0] = '\0';
394 }
395 return (T_OK);
396 }
397
398 walk = cmptoken(line, "warning");
399 if (walk != NULL) {
400 (void)trimlr(&walk);
401 WARN1("Warning: %s", walk);
402 }
403
404 walk = cmptoken(line, "error");
405 if (walk != NULL) {
406 (void)trimlr(&walk);
407 WARN1("Error: %s", walk);
408 return (T_ERR);
409 }
410
411 WARN1("Undefined pre-processor command \"#%s\"", line);
412 return (T_ERR);
413 }
414
415 static void
setup_locale(const char * locale)416 setup_locale(const char *locale)
417 {
418 (void)setlocale(LC_ALL, locale);
419 #ifdef WITH_ICONV
420 if (!doall)
421 set_new_encoding();
422 #endif
423 setnnames();
424 }
425
426 #define REPLACE(string, slen, struct_) \
427 if (strncasecmp(buf, (string), (slen)) == 0 && buf[(slen)]) { \
428 if (struct_.name != NULL) \
429 free(struct_.name); \
430 if ((struct_.name = strdup(buf + (slen))) == NULL) \
431 errx(1, "cannot allocate memory"); \
432 struct_.len = strlen(buf + (slen)); \
433 continue; \
434 }
435 static int
cal_parse(FILE * in,FILE * out)436 cal_parse(FILE *in, FILE *out)
437 {
438 char *mylocale = NULL;
439 char *line = NULL;
440 char *buf, *bufp;
441 size_t linecap = 0;
442 ssize_t linelen;
443 ssize_t l;
444 static int count = 0;
445 int i;
446 int month[MAXCOUNT];
447 int day[MAXCOUNT];
448 int year[MAXCOUNT];
449 int skip = 0;
450 int unskip = 0;
451 char *pp, p;
452 int flags;
453 char *c, *cc;
454 bool incomment = false;
455
456 if (in == NULL)
457 return (1);
458
459 cal_line = 0;
460 while ((linelen = getline(&line, &linecap, in)) > 0) {
461 cal_line++;
462 buf = line;
463 if (buf[linelen - 1] == '\n')
464 buf[--linelen] = '\0';
465
466 if (incomment) {
467 c = strstr(buf, "*/");
468 if (c) {
469 c += 2;
470 linelen -= c - buf;
471 buf = c;
472 incomment = false;
473 } else {
474 continue;
475 }
476 }
477 if (!incomment) {
478 bufp = buf;
479 do {
480 c = strstr(bufp, "//");
481 cc = strstr(bufp, "/*");
482 if (c != NULL && (cc == NULL || c - cc < 0)) {
483 bufp = c + 2;
484 /* ignore "//" within string to allow it in an URL */
485 if (c == buf || isspace(c[-1])) {
486 /* single line comment */
487 *c = '\0';
488 linelen = c - buf;
489 break;
490 }
491 } else if (cc != NULL) {
492 c = strstr(cc + 2, "*/");
493 if (c != NULL) { // 'a /* b */ c' -- cc=2, c=7+2
494 /* multi-line comment ending on same line */
495 c += 2;
496 memmove(cc, c, buf + linelen + 1 - c);
497 linelen -= c - cc;
498 bufp = cc;
499 } else {
500 /* multi-line comment */
501 *cc = '\0';
502 linelen = cc - buf;
503 incomment = true;
504 break;
505 }
506 }
507 } while (c != NULL || cc != NULL);
508 }
509
510 for (l = linelen;
511 l > 0 && isspace((unsigned char)buf[l - 1]);
512 l--)
513 ;
514 buf[l] = '\0';
515 if (buf[0] == '\0')
516 continue;
517
518 if (buf == line && *buf == '#') {
519 switch (token(buf+1, out, &skip, &unskip)) {
520 case T_ERR:
521 free(line);
522 return (1);
523 case T_OK:
524 continue;
525 case T_PROCESS:
526 break;
527 default:
528 break;
529 }
530 }
531
532 if (skip != 0)
533 continue;
534
535 /*
536 * Setting LANG in user's calendar was an old workaround
537 * for 'calendar -a' being run with C locale to properly
538 * print user's calendars in their native languages.
539 * Now that 'calendar -a' does fork with setusercontext(),
540 * and does not run iconv(), this variable has little use.
541 */
542 if (strncmp(buf, "LANG=", 5) == 0) {
543 if (mylocale == NULL)
544 mylocale = strdup(setlocale(LC_ALL, NULL));
545 setup_locale(buf + 5);
546 continue;
547 }
548 /* Parse special definitions: Easter, Paskha etc */
549 REPLACE("Easter=", 7, neaster);
550 REPLACE("Paskha=", 7, npaskha);
551 REPLACE("ChineseNewYear=", 15, ncny);
552 REPLACE("NewMoon=", 8, nnewmoon);
553 REPLACE("FullMoon=", 9, nfullmoon);
554 REPLACE("MarEquinox=", 11, nmarequinox);
555 REPLACE("SepEquinox=", 11, nsepequinox);
556 REPLACE("JunSolstice=", 12, njunsolstice);
557 REPLACE("DecSolstice=", 12, ndecsolstice);
558 if (strncmp(buf, "SEQUENCE=", 9) == 0) {
559 setnsequences(buf + 9);
560 continue;
561 }
562
563 /*
564 * If the line starts with a tab, the data has to be
565 * added to the previous line
566 */
567 if (buf[0] == '\t') {
568 for (i = 0; i < count; i++)
569 event_continue(events[i], buf);
570 continue;
571 }
572
573 /* Get rid of leading spaces (non-standard) */
574 while (isspace((unsigned char)buf[0]))
575 memcpy(buf, buf + 1, strlen(buf));
576
577 /* No tab in the line, then not a valid line */
578 if ((pp = strchr(buf, '\t')) == NULL)
579 continue;
580
581 /* Trim spaces in front of the tab */
582 while (isspace((unsigned char)pp[-1]))
583 pp--;
584
585 p = *pp;
586 *pp = '\0';
587 if ((count = parsedaymonth(buf, year, month, day, &flags,
588 extradata)) == 0)
589 continue;
590 *pp = p;
591 if (count < 0) {
592 /* Show error status based on return value */
593 if (debug)
594 WARN1("Ignored: \"%s\"", buf);
595 if (count == -1)
596 continue;
597 count = -count + 1;
598 }
599
600 /* Find the last tab */
601 while (pp[1] == '\t')
602 pp++;
603
604 for (i = 0; i < count; i++) {
605 if (debug)
606 WARN1("got \"%s\"", pp);
607 events[i] = event_add(year[i], month[i], day[i],
608 ((flags &= F_VARIABLE) != 0) ? 1 : 0, pp,
609 extradata[i]);
610 }
611 }
612 while (skip-- > 0 || unskip-- > 0) {
613 cal_line++;
614 WARN0("Missing #endif assumed");
615 }
616
617 free(line);
618 fclose(in);
619 if (mylocale != NULL) {
620 setup_locale(mylocale);
621 free(mylocale);
622 }
623
624 return (0);
625 }
626
627 void
cal(void)628 cal(void)
629 {
630 FILE *fpin;
631 FILE *fpout;
632 int i;
633
634 for (i = 0; i < MAXCOUNT; i++)
635 extradata[i] = (char *)calloc(1, 20);
636
637
638 if ((fpin = opencalin()) == NULL)
639 return;
640
641 if ((fpout = opencalout()) == NULL) {
642 fclose(fpin);
643 return;
644 }
645
646 if (cal_parse(fpin, fpout))
647 return;
648
649 event_print_all(fpout);
650 closecal(fpout);
651 }
652
653 FILE *
opencalin(void)654 opencalin(void)
655 {
656 struct stat sbuf;
657 FILE *fpin;
658
659 /* open up calendar file */
660 cal_file = calendarFile;
661 if ((fpin = fopen(calendarFile, "r")) == NULL) {
662 if (doall) {
663 if (chdir(calendarHomes[0]) != 0)
664 return (NULL);
665 if (stat(calendarNoMail, &sbuf) == 0)
666 return (NULL);
667 if ((fpin = fopen(calendarFile, "r")) == NULL)
668 return (NULL);
669 } else {
670 fpin = cal_fopen(calendarFile);
671 }
672 }
673 return (fpin);
674 }
675
676 FILE *
opencalout(void)677 opencalout(void)
678 {
679 int fd;
680
681 /* not reading all calendar files, just set output to stdout */
682 if (!doall)
683 return (stdout);
684
685 /* set output to a temporary file, so if no output don't send mail */
686 snprintf(path, sizeof(path), "%s/_calXXXXXX", _PATH_TMP);
687 if ((fd = mkstemp(path)) < 0)
688 return (NULL);
689 return (fdopen(fd, "w+"));
690 }
691
692 void
closecal(FILE * fp)693 closecal(FILE *fp)
694 {
695 struct stat sbuf;
696 int nread, pdes[2], status;
697 char buf[1024];
698
699 if (!doall)
700 return;
701
702 rewind(fp);
703 if (fstat(fileno(fp), &sbuf) || !sbuf.st_size)
704 goto done;
705 if (pipe(pdes) < 0)
706 goto done;
707 switch (fork()) {
708 case -1: /* error */
709 (void)close(pdes[0]);
710 (void)close(pdes[1]);
711 goto done;
712 case 0:
713 /* child -- set stdin to pipe output */
714 if (pdes[0] != STDIN_FILENO) {
715 (void)dup2(pdes[0], STDIN_FILENO);
716 (void)close(pdes[0]);
717 }
718 (void)close(pdes[1]);
719 execl(_PATH_SENDMAIL, "sendmail", "-i", "-t", "-F",
720 "\"Reminder Service\"", (char *)NULL);
721 warn(_PATH_SENDMAIL);
722 _exit(1);
723 }
724 /* parent -- write to pipe input */
725 (void)close(pdes[0]);
726
727 write(pdes[1], "From: \"Reminder Service\" <", 26);
728 write(pdes[1], pw->pw_name, strlen(pw->pw_name));
729 write(pdes[1], ">\nTo: <", 7);
730 write(pdes[1], pw->pw_name, strlen(pw->pw_name));
731 write(pdes[1], ">\nSubject: ", 11);
732 write(pdes[1], dayname, strlen(dayname));
733 write(pdes[1], "'s Calendar\nPrecedence: bulk\n\n", 30);
734
735 while ((nread = read(fileno(fp), buf, sizeof(buf))) > 0)
736 (void)write(pdes[1], buf, nread);
737 (void)close(pdes[1]);
738 done: (void)fclose(fp);
739 (void)unlink(path);
740 while (wait(&status) >= 0);
741 }
742