xref: /freebsd/usr.bin/calendar/io.c (revision 1e413cf93298b5b97441a21d9a50fdcd0ee9945e)
1 /*
2  * Copyright (c) 1989, 1993, 1994
3  *	The Regents of the University of California.  All rights reserved.
4  *
5  * Redistribution and use in source and binary forms, with or without
6  * modification, are permitted provided that the following conditions
7  * are met:
8  * 1. Redistributions of source code must retain the above copyright
9  *    notice, this list of conditions and the following disclaimer.
10  * 2. Redistributions in binary form must reproduce the above copyright
11  *    notice, this list of conditions and the following disclaimer in the
12  *    documentation and/or other materials provided with the distribution.
13  * 3. All advertising materials mentioning features or use of this software
14  *    must display the following acknowledgement:
15  *	This product includes software developed by the University of
16  *	California, Berkeley and its contributors.
17  * 4. Neither the name of the University nor the names of its contributors
18  *    may be used to endorse or promote products derived from this software
19  *    without specific prior written permission.
20  *
21  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31  * SUCH DAMAGE.
32  */
33 
34 #ifndef lint
35 static const char copyright[] =
36 "@(#) Copyright (c) 1989, 1993\n\
37 	The Regents of the University of California.  All rights reserved.\n";
38 #endif
39 
40 #if 0
41 #ifndef lint
42 static char sccsid[] = "@(#)calendar.c  8.3 (Berkeley) 3/25/94";
43 #endif
44 #endif
45 
46 #include <sys/cdefs.h>
47 __FBSDID("$FreeBSD$");
48 
49 #include <sys/types.h>
50 #include <sys/param.h>
51 #include <sys/stat.h>
52 #include <sys/time.h>
53 #include <sys/uio.h>
54 #include <sys/wait.h>
55 #include <ctype.h>
56 #include <err.h>
57 #include <errno.h>
58 #include <langinfo.h>
59 #include <locale.h>
60 #include <pwd.h>
61 #include <stdio.h>
62 #include <stdlib.h>
63 #include <string.h>
64 #include <unistd.h>
65 
66 #include "pathnames.h"
67 #include "calendar.h"
68 
69 
70 const char *calendarFile = "calendar";  /* default calendar file */
71 const char *calendarHomes[] = { ".calendar", _PATH_INCLUDE }; /* HOME */
72 const char *calendarNoMail = "nomail";  /* don't sent mail if this file exist */
73 
74 struct fixs neaster, npaskha;
75 
76 struct iovec header[] = {
77 	{"From: ", 6},
78 	{NULL, 0},
79 	{" (Reminder Service)\nTo: ", 24},
80 	{NULL, 0},
81 	{"\nSubject: ", 10},
82 	{NULL, 0},
83 	{"'s Calendar\nPrecedence: bulk\n\n",  30},
84 };
85 
86 
87 void
88 cal(void)
89 {
90 	int printing;
91 	char *p;
92 	FILE *fp;
93 	int ch, l;
94 	int month;
95 	int day;
96 	int var;
97 	static int d_first = -1;
98 	char buf[2048 + 1];
99 	struct event *events = NULL;
100 
101 	if ((fp = opencal()) == NULL)
102 		return;
103 	for (printing = 0; fgets(buf, sizeof(buf), stdin) != NULL;) {
104 		if ((p = strchr(buf, '\n')) != NULL)
105 			*p = '\0';
106 		else
107 			while ((ch = getchar()) != '\n' && ch != EOF);
108 		for (l = strlen(buf);
109 		     l > 0 && isspace((unsigned char)buf[l - 1]);
110 		     l--)
111 			;
112 		buf[l] = '\0';
113 		if (buf[0] == '\0')
114 			continue;
115 		if (strncmp(buf, "LANG=", 5) == 0) {
116 			(void) setlocale(LC_ALL, buf + 5);
117 			d_first = (*nl_langinfo(D_MD_ORDER) == 'd');
118 			setnnames();
119 			continue;
120 		}
121 		if (strncasecmp(buf, "Easter=", 7) == 0 && buf[7]) {
122 			if (neaster.name != NULL)
123 				free(neaster.name);
124 			if ((neaster.name = strdup(buf + 7)) == NULL)
125 				errx(1, "cannot allocate memory");
126 			neaster.len = strlen(buf + 7);
127 			continue;
128 		}
129 		if (strncasecmp(buf, "Paskha=", 7) == 0 && buf[7]) {
130 			if (npaskha.name != NULL)
131 				free(npaskha.name);
132 			if ((npaskha.name = strdup(buf + 7)) == NULL)
133 				errx(1, "cannot allocate memory");
134 			npaskha.len = strlen(buf + 7);
135 			continue;
136 		}
137 		if (buf[0] != '\t') {
138 			printing = isnow(buf, &month, &day, &var) ? 1 : 0;
139 			if ((p = strchr(buf, '\t')) == NULL)
140 				continue;
141 			if (p > buf && p[-1] == '*')
142 				var = 1;
143 			if (printing) {
144 				struct tm tm;
145 				char dbuf[80];
146 
147 				if (d_first < 0)
148 					d_first = (*nl_langinfo(D_MD_ORDER) == 'd');
149 				tm.tm_sec = 0;  /* unused */
150 				tm.tm_min = 0;  /* unused */
151 				tm.tm_hour = 0; /* unused */
152 				tm.tm_wday = 0; /* unused */
153 				tm.tm_mon = month - 1;
154 				tm.tm_mday = day;
155 				tm.tm_year = tp->tm_year; /* unused */
156 				(void)strftime(dbuf, sizeof(dbuf),
157 					       d_first ? "%e %b" : "%b %e",
158 					       &tm);
159 				events = event_add(events, month, day, dbuf, var, p);
160 			}
161 		}
162 		else if (printing)
163 			event_continue(events, buf);
164 	}
165 
166 	event_print_all(fp, events);
167 	closecal(fp);
168 }
169 
170 /*
171  * Functions to handle buffered calendar events.
172  */
173 struct event *
174 event_add(struct event *events, int month, int day, char *date, int var, char *txt)
175 {
176 	struct event *e;
177 
178 	e = (struct event *)calloc(1, sizeof(struct event));
179 	if (e == NULL)
180 		errx(1, "event_add: cannot allocate memory");
181 	e->month = month;
182 	e->day = day;
183 	e->var = var;
184 	e->date = strdup(date);
185 	if (e->date == NULL)
186 		errx(1, "event_add: cannot allocate memory");
187 	e->text = strdup(txt);
188 	if (e->text == NULL)
189 		errx(1, "event_add: cannot allocate memory");
190 	e->next = events;
191 
192 	return e;
193 }
194 
195 void
196 event_continue(struct event *e, char *txt)
197 {
198 	char *text;
199 
200 	text = strdup(e->text);
201 	if (text == NULL)
202 		errx(1, "event_continue: cannot allocate memory");
203 
204 	free(e->text);
205 	e->text = (char *)malloc(strlen(text) + strlen(txt) + 3);
206 	if (e->text == NULL)
207 		errx(1, "event_continue: cannot allocate memory");
208 	strcpy(e->text, text);
209 	strcat(e->text, "\n");
210 	strcat(e->text, txt);
211 	free(text);
212 
213 	return;
214 }
215 
216 void
217 event_print_all(FILE *fp, struct event *events)
218 {
219 	struct event *e, *e_next;
220 	int daycount = f_dayAfter + f_dayBefore;
221 	int daycounter;
222 	int day, month;
223 
224 	for (daycounter = 0; daycounter <= daycount; daycounter++) {
225 		day = tp->tm_yday - f_dayBefore + daycounter;
226 		if (day < 0) day += yrdays;
227 		if (day >= yrdays) day -= yrdays;
228 
229 		month = 1;
230 		while (month <= 12) {
231 			if (day <= cumdays[month])
232 				break;
233 			month++;
234 		}
235 		month--;
236 		day -= cumdays[month];
237 
238 #ifdef DEBUG
239 		fprintf(stderr,"event_print_allmonth: %d, day: %d\n",month,day);
240 #endif
241 
242 		for (e = events; e != NULL; e = e_next ) {
243 			e_next = e->next;
244 
245 			if (month != e->month || day != e->day)
246 				continue;
247 
248 			(void)fprintf(fp, "%s%c%s\n", e->date,
249 			    e->var ? '*' : ' ', e->text);
250 		}
251 	}
252 }
253 
254 int
255 getfield(char *p, char **endp, int *flags)
256 {
257 	int val, var;
258 	char *start, savech;
259 
260 	for (; !isdigit((unsigned char)*p) && !isalpha((unsigned char)*p)
261                && *p != '*'; ++p);
262 	if (*p == '*') {			/* `*' is current month */
263 		*flags |= F_ISMONTH;
264 		*endp = p+1;
265 		return (tp->tm_mon + 1);
266 	}
267 	if (isdigit((unsigned char)*p)) {
268 		val = strtol(p, &p, 10);	/* if 0, it's failure */
269 		for (; !isdigit((unsigned char)*p)
270                        && !isalpha((unsigned char)*p) && *p != '*'; ++p);
271 		*endp = p;
272 		return (val);
273 	}
274 	for (start = p; isalpha((unsigned char)*++p););
275 
276 	/* Sunday-1 */
277 	if (*p == '+' || *p == '-')
278 	    for(; isdigit((unsigned char)*++p););
279 
280 	savech = *p;
281 	*p = '\0';
282 
283 	/* Month */
284 	if ((val = getmonth(start)) != 0)
285 		*flags |= F_ISMONTH;
286 
287 	/* Day */
288 	else if ((val = getday(start)) != 0) {
289 	    *flags |= F_ISDAY;
290 
291 	    /* variable weekday */
292 	    if ((var = getdayvar(start)) != 0) {
293 		if (var <=5 && var >= -4)
294 		    val += var * 10;
295 #ifdef DEBUG
296 		printf("var: %d\n", var);
297 #endif
298 	    }
299 	}
300 
301 	/* Easter */
302 	else if ((val = geteaster(start, tp->tm_year + 1900)) != 0)
303 	    *flags |= F_EASTER;
304 
305 	/* Paskha */
306 	else if ((val = getpaskha(start, tp->tm_year + 1900)) != 0)
307 	    *flags |= F_EASTER;
308 
309 	/* undefined rest */
310 	else {
311 		*p = savech;
312 		return (0);
313 	}
314 	for (*p = savech; !isdigit((unsigned char)*p)
315                && !isalpha((unsigned char)*p) && *p != '*'; ++p);
316 	*endp = p;
317 	return (val);
318 }
319 
320 char path[MAXPATHLEN];
321 
322 FILE *
323 opencal(void)
324 {
325 	uid_t uid;
326 	size_t i;
327 	int fd, found, pdes[2];
328 	struct stat sbuf;
329 
330 	/* open up calendar file as stdin */
331 	if (!freopen(calendarFile, "r", stdin)) {
332 		if (doall) {
333 		    if (chdir(calendarHomes[0]) != 0)
334 			return (NULL);
335 		    if (stat(calendarNoMail, &sbuf) == 0)
336 		        return (NULL);
337 		    if (!freopen(calendarFile, "r", stdin))
338 		        return (NULL);
339 		} else {
340 			char *home = getenv("HOME");
341 			if (home == NULL || *home == '\0')
342 				errx(1, "cannot get home directory");
343 			chdir(home);
344 			for (found = i = 0; i < sizeof(calendarHomes) /
345 			    sizeof(calendarHomes[0]); i++)
346 			    if (chdir(calendarHomes[i]) == 0 &&
347 			          freopen(calendarFile, "r", stdin)) {
348 				    found = 1;
349 				    break;
350 			    }
351 			if (!found)
352 			    errx(1, "can't open calendar file \"%s\": %s (%d)",
353                                  calendarFile, strerror(errno), errno);
354 		}
355 	}
356 	if (pipe(pdes) < 0)
357 		return (NULL);
358 	switch (fork()) {
359 	case -1:			/* error */
360 		(void)close(pdes[0]);
361 		(void)close(pdes[1]);
362 		return (NULL);
363 	case 0:
364 		/* child -- stdin already setup, set stdout to pipe input */
365 		if (pdes[1] != STDOUT_FILENO) {
366 			(void)dup2(pdes[1], STDOUT_FILENO);
367 			(void)close(pdes[1]);
368 		}
369 		(void)close(pdes[0]);
370 		uid = geteuid();
371 		if (setuid(getuid()) < 0) {
372 			warnx("first setuid failed");
373 			_exit(1);
374 		};
375 		if (setgid(getegid()) < 0) {
376 			warnx("setgid failed");
377 			_exit(1);
378 		}
379 		if (setuid(uid) < 0) {
380 			warnx("setuid failed");
381 			_exit(1);
382 		}
383 		execl(_PATH_CPP, "cpp", "-P",
384 		    "-traditional", "-nostdinc",	/* GCC specific opts */
385 		    "-I.", "-I", _PATH_INCLUDE, (char *)NULL);
386 		warn(_PATH_CPP);
387 		_exit(1);
388 	}
389 	/* parent -- set stdin to pipe output */
390 	(void)dup2(pdes[0], STDIN_FILENO);
391 	(void)close(pdes[0]);
392 	(void)close(pdes[1]);
393 
394 	/* not reading all calendar files, just set output to stdout */
395 	if (!doall)
396 		return (stdout);
397 
398 	/* set output to a temporary file, so if no output don't send mail */
399 	(void)snprintf(path, sizeof(path), "%s/_calXXXXXX", _PATH_TMP);
400 	if ((fd = mkstemp(path)) < 0)
401 		return (NULL);
402 	return (fdopen(fd, "w+"));
403 }
404 
405 void
406 closecal(FILE *fp)
407 {
408 	uid_t uid;
409 	struct stat sbuf;
410 	int nread, pdes[2], status;
411 	char buf[1024];
412 
413 	if (!doall)
414 		return;
415 
416 	(void)rewind(fp);
417 	if (fstat(fileno(fp), &sbuf) || !sbuf.st_size)
418 		goto done;
419 	if (pipe(pdes) < 0)
420 		goto done;
421 	switch (fork()) {
422 	case -1:			/* error */
423 		(void)close(pdes[0]);
424 		(void)close(pdes[1]);
425 		goto done;
426 	case 0:
427 		/* child -- set stdin to pipe output */
428 		if (pdes[0] != STDIN_FILENO) {
429 			(void)dup2(pdes[0], STDIN_FILENO);
430 			(void)close(pdes[0]);
431 		}
432 		(void)close(pdes[1]);
433 		uid = geteuid();
434 		if (setuid(getuid()) < 0) {
435 			warnx("setuid failed");
436 			_exit(1);
437 		};
438 		if (setgid(getegid()) < 0) {
439 			warnx("setgid failed");
440 			_exit(1);
441 		}
442 		if (setuid(uid) < 0) {
443 			warnx("setuid failed");
444 			_exit(1);
445 		}
446 		execl(_PATH_SENDMAIL, "sendmail", "-i", "-t", "-F",
447 		    "\"Reminder Service\"", (char *)NULL);
448 		warn(_PATH_SENDMAIL);
449 		_exit(1);
450 	}
451 	/* parent -- write to pipe input */
452 	(void)close(pdes[0]);
453 
454 	header[1].iov_base = header[3].iov_base = pw->pw_name;
455 	header[1].iov_len = header[3].iov_len = strlen(pw->pw_name);
456 	writev(pdes[1], header, 7);
457 	while ((nread = read(fileno(fp), buf, sizeof(buf))) > 0)
458 		(void)write(pdes[1], buf, nread);
459 	(void)close(pdes[1]);
460 done:	(void)fclose(fp);
461 	(void)unlink(path);
462 	while (wait(&status) >= 0);
463 }
464