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 __FBSDID("$FreeBSD: stable/12/usr.bin/calendar/io.c 345577 2019-03-27 14:47:10Z bapt $");
46
47 #include <sys/param.h>
48 #include <sys/stat.h>
49 #include <sys/wait.h>
50 #include <ctype.h>
51 #include <err.h>
52 #include <errno.h>
53 #include <langinfo.h>
54 #include <locale.h>
55 #include <pwd.h>
56 #include <stdbool.h>
57 #include <stdio.h>
58 #include <stdlib.h>
59 #include <string.h>
60 #include <stringlist.h>
61 #include <time.h>
62 #include <unistd.h>
63
64 #include "pathnames.h"
65 #include "calendar.h"
66
67 enum {
68 T_OK = 0,
69 T_ERR,
70 T_PROCESS,
71 };
72
73 const char *calendarFile = "calendar"; /* default calendar file */
74 static const char *calendarHomes[] = {".calendar", _PATH_INCLUDE}; /* HOME */
75 static const char *calendarNoMail = "nomail";/* don't sent mail if file exist */
76
77 static char path[MAXPATHLEN];
78
79 struct fixs neaster, npaskha, ncny, nfullmoon, nnewmoon;
80 struct fixs nmarequinox, nsepequinox, njunsolstice, ndecsolstice;
81
82 static int cal_parse(FILE *in, FILE *out);
83
84 static StringList *definitions = NULL;
85 static struct event *events[MAXCOUNT];
86 static char *extradata[MAXCOUNT];
87
88 static void
trimlr(char ** buf)89 trimlr(char **buf)
90 {
91 char *walk = *buf;
92 char *last;
93
94 while (isspace(*walk))
95 walk++;
96 if (*walk != '\0') {
97 last = walk + strlen(walk) - 1;
98 while (last > walk && isspace(*last))
99 last--;
100 *(last+1) = 0;
101 }
102
103 *buf = walk;
104 }
105
106 static FILE *
cal_fopen(const char * file)107 cal_fopen(const char *file)
108 {
109 FILE *fp;
110 char *home = getenv("HOME");
111 unsigned int i;
112
113 if (home == NULL || *home == '\0') {
114 warnx("Cannot get home directory");
115 return (NULL);
116 }
117
118 if (chdir(home) != 0) {
119 warnx("Cannot enter home directory");
120 return (NULL);
121 }
122
123 for (i = 0; i < nitems(calendarHomes); i++) {
124 if (chdir(calendarHomes[i]) != 0)
125 continue;
126
127 if ((fp = fopen(file, "r")) != NULL)
128 return (fp);
129 }
130
131 warnx("can't open calendar file \"%s\"", file);
132
133 return (NULL);
134 }
135
136 static int
token(char * line,FILE * out,bool * skip)137 token(char *line, FILE *out, bool *skip)
138 {
139 char *walk, c, a;
140
141 if (strncmp(line, "endif", 5) == 0) {
142 *skip = false;
143 return (T_OK);
144 }
145
146 if (*skip)
147 return (T_OK);
148
149 if (strncmp(line, "include", 7) == 0) {
150 walk = line + 7;
151
152 trimlr(&walk);
153
154 if (*walk == '\0') {
155 warnx("Expecting arguments after #include");
156 return (T_ERR);
157 }
158
159 if (*walk != '<' && *walk != '\"') {
160 warnx("Excecting '<' or '\"' after #include");
161 return (T_ERR);
162 }
163
164 a = *walk;
165 walk++;
166 c = walk[strlen(walk) - 1];
167
168 switch(c) {
169 case '>':
170 if (a != '<') {
171 warnx("Unterminated include expecting '\"'");
172 return (T_ERR);
173 }
174 break;
175 case '\"':
176 if (a != '\"') {
177 warnx("Unterminated include expecting '>'");
178 return (T_ERR);
179 }
180 break;
181 default:
182 warnx("Unterminated include expecting '%c'",
183 a == '<' ? '>' : '\"' );
184 return (T_ERR);
185 }
186 walk[strlen(walk) - 1] = '\0';
187
188 if (cal_parse(cal_fopen(walk), out))
189 return (T_ERR);
190
191 return (T_OK);
192 }
193
194 if (strncmp(line, "define", 6) == 0) {
195 if (definitions == NULL)
196 definitions = sl_init();
197 walk = line + 6;
198 trimlr(&walk);
199
200 if (*walk == '\0') {
201 warnx("Expecting arguments after #define");
202 return (T_ERR);
203 }
204
205 sl_add(definitions, strdup(walk));
206 return (T_OK);
207 }
208
209 if (strncmp(line, "ifndef", 6) == 0) {
210 walk = line + 6;
211 trimlr(&walk);
212
213 if (*walk == '\0') {
214 warnx("Expecting arguments after #ifndef");
215 return (T_ERR);
216 }
217
218 if (definitions != NULL && sl_find(definitions, walk) != NULL)
219 *skip = true;
220
221 return (T_OK);
222 }
223
224 return (T_PROCESS);
225
226 }
227
228 #define REPLACE(string, slen, struct_) \
229 if (strncasecmp(buf, (string), (slen)) == 0 && buf[(slen)]) { \
230 if (struct_.name != NULL) \
231 free(struct_.name); \
232 if ((struct_.name = strdup(buf + (slen))) == NULL) \
233 errx(1, "cannot allocate memory"); \
234 struct_.len = strlen(buf + (slen)); \
235 continue; \
236 }
237 static int
cal_parse(FILE * in,FILE * out)238 cal_parse(FILE *in, FILE *out)
239 {
240 char *line = NULL;
241 char *buf;
242 size_t linecap = 0;
243 ssize_t linelen;
244 ssize_t l;
245 static int d_first = -1;
246 static int count = 0;
247 int i;
248 int month[MAXCOUNT];
249 int day[MAXCOUNT];
250 int year[MAXCOUNT];
251 bool skip = false;
252 char dbuf[80];
253 char *pp, p;
254 struct tm tm;
255 int flags;
256
257 /* Unused */
258 tm.tm_sec = 0;
259 tm.tm_min = 0;
260 tm.tm_hour = 0;
261 tm.tm_wday = 0;
262
263 if (in == NULL)
264 return (1);
265
266 while ((linelen = getline(&line, &linecap, in)) > 0) {
267 if (*line == '#') {
268 switch (token(line+1, out, &skip)) {
269 case T_ERR:
270 free(line);
271 return (1);
272 case T_OK:
273 continue;
274 case T_PROCESS:
275 break;
276 default:
277 break;
278 }
279 }
280
281 if (skip)
282 continue;
283
284 buf = line;
285 for (l = linelen;
286 l > 0 && isspace((unsigned char)buf[l - 1]);
287 l--)
288 ;
289 buf[l] = '\0';
290 if (buf[0] == '\0')
291 continue;
292
293 /* Parse special definitions: LANG, Easter, Paskha etc */
294 if (strncmp(buf, "LANG=", 5) == 0) {
295 (void)setlocale(LC_ALL, buf + 5);
296 d_first = (*nl_langinfo(D_MD_ORDER) == 'd');
297 #ifdef WITH_ICONV
298 set_new_encoding();
299 #endif
300 setnnames();
301 continue;
302 }
303 REPLACE("Easter=", 7, neaster);
304 REPLACE("Paskha=", 7, npaskha);
305 REPLACE("ChineseNewYear=", 15, ncny);
306 REPLACE("NewMoon=", 8, nnewmoon);
307 REPLACE("FullMoon=", 9, nfullmoon);
308 REPLACE("MarEquinox=", 11, nmarequinox);
309 REPLACE("SepEquinox=", 11, nsepequinox);
310 REPLACE("JunSolstice=", 12, njunsolstice);
311 REPLACE("DecSolstice=", 12, ndecsolstice);
312 if (strncmp(buf, "SEQUENCE=", 9) == 0) {
313 setnsequences(buf + 9);
314 continue;
315 }
316
317 /*
318 * If the line starts with a tab, the data has to be
319 * added to the previous line
320 */
321 if (buf[0] == '\t') {
322 for (i = 0; i < count; i++)
323 event_continue(events[i], buf);
324 continue;
325 }
326
327 /* Get rid of leading spaces (non-standard) */
328 while (isspace((unsigned char)buf[0]))
329 memcpy(buf, buf + 1, strlen(buf));
330
331 /* No tab in the line, then not a valid line */
332 if ((pp = strchr(buf, '\t')) == NULL)
333 continue;
334
335 /* Trim spaces in front of the tab */
336 while (isspace((unsigned char)pp[-1]))
337 pp--;
338
339 p = *pp;
340 *pp = '\0';
341 if ((count = parsedaymonth(buf, year, month, day, &flags,
342 extradata)) == 0)
343 continue;
344 *pp = p;
345 if (count < 0) {
346 /* Show error status based on return value */
347 if (debug)
348 fprintf(stderr, "Ignored: %s\n", buf);
349 if (count == -1)
350 continue;
351 count = -count + 1;
352 }
353
354 /* Find the last tab */
355 while (pp[1] == '\t')
356 pp++;
357
358 if (d_first < 0)
359 d_first = (*nl_langinfo(D_MD_ORDER) == 'd');
360
361 for (i = 0; i < count; i++) {
362 tm.tm_mon = month[i] - 1;
363 tm.tm_mday = day[i];
364 tm.tm_year = year[i] - 1900;
365 (void)strftime(dbuf, sizeof(dbuf),
366 d_first ? "%e %b" : "%b %e", &tm);
367 if (debug)
368 fprintf(stderr, "got %s\n", pp);
369 events[i] = event_add(year[i], month[i], day[i], dbuf,
370 ((flags &= F_VARIABLE) != 0) ? 1 : 0, pp,
371 extradata[i]);
372 }
373 }
374
375 free(line);
376 fclose(in);
377
378 return (0);
379 }
380
381 void
cal(void)382 cal(void)
383 {
384 FILE *fpin;
385 FILE *fpout;
386 int i;
387
388 for (i = 0; i < MAXCOUNT; i++)
389 extradata[i] = (char *)calloc(1, 20);
390
391
392 if ((fpin = opencalin()) == NULL)
393 return;
394
395 if ((fpout = opencalout()) == NULL) {
396 fclose(fpin);
397 return;
398 }
399
400 if (cal_parse(fpin, fpout))
401 return;
402
403 event_print_all(fpout);
404 closecal(fpout);
405 }
406
407 FILE *
opencalin(void)408 opencalin(void)
409 {
410 struct stat sbuf;
411 FILE *fpin;
412
413 /* open up calendar file */
414 if ((fpin = fopen(calendarFile, "r")) == NULL) {
415 if (doall) {
416 if (chdir(calendarHomes[0]) != 0)
417 return (NULL);
418 if (stat(calendarNoMail, &sbuf) == 0)
419 return (NULL);
420 if ((fpin = fopen(calendarFile, "r")) == NULL)
421 return (NULL);
422 } else {
423 fpin = cal_fopen(calendarFile);
424 }
425 }
426 return (fpin);
427 }
428
429 FILE *
opencalout(void)430 opencalout(void)
431 {
432 int fd;
433
434 /* not reading all calendar files, just set output to stdout */
435 if (!doall)
436 return (stdout);
437
438 /* set output to a temporary file, so if no output don't send mail */
439 snprintf(path, sizeof(path), "%s/_calXXXXXX", _PATH_TMP);
440 if ((fd = mkstemp(path)) < 0)
441 return (NULL);
442 return (fdopen(fd, "w+"));
443 }
444
445 void
closecal(FILE * fp)446 closecal(FILE *fp)
447 {
448 uid_t uid;
449 struct stat sbuf;
450 int nread, pdes[2], status;
451 char buf[1024];
452
453 if (!doall)
454 return;
455
456 rewind(fp);
457 if (fstat(fileno(fp), &sbuf) || !sbuf.st_size)
458 goto done;
459 if (pipe(pdes) < 0)
460 goto done;
461 switch (fork()) {
462 case -1: /* error */
463 (void)close(pdes[0]);
464 (void)close(pdes[1]);
465 goto done;
466 case 0:
467 /* child -- set stdin to pipe output */
468 if (pdes[0] != STDIN_FILENO) {
469 (void)dup2(pdes[0], STDIN_FILENO);
470 (void)close(pdes[0]);
471 }
472 (void)close(pdes[1]);
473 uid = geteuid();
474 if (setuid(getuid()) < 0) {
475 warnx("setuid failed");
476 _exit(1);
477 }
478 if (setgid(getegid()) < 0) {
479 warnx("setgid failed");
480 _exit(1);
481 }
482 if (setuid(uid) < 0) {
483 warnx("setuid failed");
484 _exit(1);
485 }
486 execl(_PATH_SENDMAIL, "sendmail", "-i", "-t", "-F",
487 "\"Reminder Service\"", (char *)NULL);
488 warn(_PATH_SENDMAIL);
489 _exit(1);
490 }
491 /* parent -- write to pipe input */
492 (void)close(pdes[0]);
493
494 write(pdes[1], "From: \"Reminder Service\" <", 26);
495 write(pdes[1], pw->pw_name, strlen(pw->pw_name));
496 write(pdes[1], ">\nTo: <", 7);
497 write(pdes[1], pw->pw_name, strlen(pw->pw_name));
498 write(pdes[1], ">\nSubject: ", 11);
499 write(pdes[1], dayname, strlen(dayname));
500 write(pdes[1], "'s Calendar\nPrecedence: bulk\n\n", 30);
501
502 while ((nread = read(fileno(fp), buf, sizeof(buf))) > 0)
503 (void)write(pdes[1], buf, nread);
504 (void)close(pdes[1]);
505 done: (void)fclose(fp);
506 (void)unlink(path);
507 while (wait(&status) >= 0);
508 }
509