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
35static 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
42static char sccsid[] = "@(#)calendar.c  8.3 (Berkeley) 3/25/94";
43#endif
44#endif
45
46#include <sys/cdefs.h>
47__FBSDID("$FreeBSD: src/usr.bin/calendar/io.c,v 1.24 2007/12/30 22:04:04 grog Exp $");
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
70const char *calendarFile = "calendar";  /* default calendar file */
71const char *calendarHomes[] = { ".calendar", _PATH_INCLUDE }; /* HOME */
72const char *calendarNoMail = "nomail";  /* don't sent mail if this file exist */
73
74struct fixs neaster, npaskha;
75
76struct 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
87void
88cal(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#if DEBUG
141				fprintf(stderr, "[continue <%s>]\n", buf);
142#endif
143				continue;
144			}
145			if (p > buf && p[-1] == '*')
146				var = 1;
147			if (printing) {
148#if DEBUG
149				fprintf(stderr, "[Add event]\n");
150#endif
151				struct tm tm;
152				char dbuf[80];
153
154				if (d_first < 0)
155					d_first = (*nl_langinfo(D_MD_ORDER) == 'd');
156				tm.tm_sec = 0;  /* unused */
157				tm.tm_min = 0;  /* unused */
158				tm.tm_hour = 0; /* unused */
159				tm.tm_wday = 0; /* unused */
160				tm.tm_mon = month - 1;
161				tm.tm_mday = day;
162				tm.tm_year = tp->tm_year; /* unused */
163				(void)strftime(dbuf, sizeof(dbuf),
164					       d_first ? "%e %b" : "%b %e",
165					       &tm);
166				events = event_add(events, month, day, dbuf, var, p);
167			}
168		}
169		else if (printing)
170			event_continue(events, buf);
171	}
172
173	event_print_all(fp, events);
174	closecal(fp);
175}
176
177/*
178 * Functions to handle buffered calendar events.
179 */
180struct event *
181event_add(struct event *events, int month, int day, char *date, int var, char *txt)
182{
183	struct event *e;
184
185	e = (struct event *)calloc(1, sizeof(struct event));
186	if (e == NULL)
187		errx(1, "event_add: cannot allocate memory");
188	e->month = month;
189	e->day = day;
190	e->var = var;
191	e->date = strdup(date);
192	if (e->date == NULL)
193		errx(1, "event_add: cannot allocate memory");
194	e->text = strdup(txt);
195	if (e->text == NULL)
196		errx(1, "event_add: cannot allocate memory");
197	e->next = events;
198
199	return e;
200}
201
202void
203event_continue(struct event *e, char *txt)
204{
205	char *text;
206
207	text = strdup(e->text);
208	if (text == NULL)
209		errx(1, "event_continue: cannot allocate memory");
210
211	free(e->text);
212	e->text = (char *)malloc(strlen(text) + strlen(txt) + 3);
213	if (e->text == NULL)
214		errx(1, "event_continue: cannot allocate memory");
215	strcpy(e->text, text);
216	strcat(e->text, "\n");
217	strcat(e->text, txt);
218	free(text);
219
220	return;
221}
222
223void
224event_print_all(FILE *fp, struct event *events)
225{
226	struct event *e, *e_next;
227	int daycount = f_dayAfter + f_dayBefore;
228	int daycounter;
229	int day, month;
230
231	for (daycounter = 0; daycounter <= daycount; daycounter++) {
232		day = tp->tm_yday - f_dayBefore + daycounter;
233		if (day < 0) day += yrdays;
234		if (day >= yrdays) day -= yrdays;
235
236		month = 1;
237		while (month <= 12) {
238			if (day <= cumdays[month])
239				break;
240			month++;
241		}
242		month--;
243		day -= cumdays[month];
244
245#ifdef DEBUG
246		fprintf(stderr,"event_print_allmonth: %d, day: %d\n",month,day);
247#endif
248
249		for (e = events; e != NULL; e = e_next ) {
250			e_next = e->next;
251
252			if (month != e->month || day != e->day)
253				continue;
254
255			(void)fprintf(fp, "%s%c%s\n", e->date,
256			    e->var ? '*' : ' ', e->text);
257		}
258	}
259}
260
261int
262getfield(char *p, char **endp, int *flags)
263{
264	int val, var;
265	char *start, savech;
266
267	for (; !isdigit((unsigned char)*p) && !isalpha((unsigned char)*p)
268               && *p != '*'; ++p);
269	if (*p == '*') {			/* `*' is current month */
270		*flags |= F_ISMONTH;
271		*endp = p+1;
272		return (tp->tm_mon + 1);
273	}
274	if (isdigit((unsigned char)*p)) {
275		val = strtol(p, &p, 10);	/* if 0, it's failure */
276		for (; !isdigit((unsigned char)*p)
277                       && !isalpha((unsigned char)*p) && *p != '*'; ++p);
278		*endp = p;
279		return (val);
280	}
281	for (start = p; isalpha((unsigned char)*++p););
282
283	/* Sunday-1 */
284	if (*p == '+' || *p == '-')
285	    for(; isdigit((unsigned char)*++p););
286
287	savech = *p;
288	*p = '\0';
289
290	/* Month */
291	if ((val = getmonth(start)) != 0)
292		*flags |= F_ISMONTH;
293
294	/* Day */
295	else if ((val = getday(start)) != 0) {
296	    *flags |= F_ISDAY;
297
298	    /* variable weekday */
299	    if ((var = getdayvar(start)) != 0) {
300		if (var <=5 && var >= -4)
301		    val += var * 10;
302#ifdef DEBUG
303		printf("var: %d\n", var);
304#endif
305	    }
306	}
307
308	/* Easter */
309	else if ((val = geteaster(start, tp->tm_year + 1900)) != 0)
310	    *flags |= F_EASTER;
311
312	/* Paskha */
313	else if ((val = getpaskha(start, tp->tm_year + 1900)) != 0)
314	    *flags |= F_EASTER;
315
316	/* undefined rest */
317	else {
318		*p = savech;
319		return (0);
320	}
321	for (*p = savech; !isdigit((unsigned char)*p)
322               && !isalpha((unsigned char)*p) && *p != '*'; ++p);
323	*endp = p;
324	return (val);
325}
326
327char path[MAXPATHLEN];
328
329FILE *
330opencal(void)
331{
332	uid_t uid;
333	size_t i;
334	int fd, found, pdes[2];
335	struct stat sbuf;
336
337	/* open up calendar file as stdin */
338	if (!freopen(calendarFile, "r", stdin)) {
339		if (doall) {
340		    if (chdir(calendarHomes[0]) != 0)
341			return (NULL);
342		    if (stat(calendarNoMail, &sbuf) == 0)
343		        return (NULL);
344		    if (!freopen(calendarFile, "r", stdin))
345		        return (NULL);
346		} else {
347			char *home = getenv("HOME");
348			if (home == NULL || *home == '\0')
349				errx(1, "cannot get home directory");
350			chdir(home);
351			for (found = i = 0; i < sizeof(calendarHomes) /
352			    sizeof(calendarHomes[0]); i++)
353			    if (chdir(calendarHomes[i]) == 0 &&
354			          freopen(calendarFile, "r", stdin)) {
355				    found = 1;
356				    break;
357			    }
358			if (!found)
359			    errx(1, "can't open calendar file \"%s\": %s (%d)",
360                                 calendarFile, strerror(errno), errno);
361		}
362	}
363	if (pipe(pdes) < 0)
364		return (NULL);
365	switch (fork()) {
366	case -1:			/* error */
367		(void)close(pdes[0]);
368		(void)close(pdes[1]);
369		return (NULL);
370	case 0:
371		/* child -- stdin already setup, set stdout to pipe input */
372		if (pdes[1] != STDOUT_FILENO) {
373			(void)dup2(pdes[1], STDOUT_FILENO);
374			(void)close(pdes[1]);
375		}
376		(void)close(pdes[0]);
377		uid = geteuid();
378		if (setuid(getuid()) < 0) {
379			warnx("first setuid failed");
380			_exit(1);
381		};
382		if (setgid(getegid()) < 0) {
383			warnx("setgid failed");
384			_exit(1);
385		}
386		if (setuid(uid) < 0) {
387			warnx("setuid failed");
388			_exit(1);
389		}
390		execl(_PATH_CPP, "cpp", "-w", "-P",
391		    "-traditional", "-nostdinc",	/* GCC specific opts */
392		    "-I.", "-I" _PATH_INCLUDE, (char *)NULL);
393		warn(_PATH_CPP);
394		_exit(1);
395	}
396	/* parent -- set stdin to pipe output */
397	(void)dup2(pdes[0], STDIN_FILENO);
398	(void)close(pdes[0]);
399	(void)close(pdes[1]);
400
401	/* not reading all calendar files, just set output to stdout */
402	if (!doall)
403		return (stdout);
404
405	/* set output to a temporary file, so if no output don't send mail */
406	(void)snprintf(path, sizeof(path), "%s/_calXXXXXX", _PATH_TMP);
407	if ((fd = mkstemp(path)) < 0)
408		return (NULL);
409	return (fdopen(fd, "w+"));
410}
411
412void
413closecal(FILE *fp)
414{
415	uid_t uid;
416	struct stat sbuf;
417	int nread, pdes[2], status;
418	char buf[1024];
419
420	if (!doall)
421		return;
422
423	(void)rewind(fp);
424	if (fstat(fileno(fp), &sbuf) || !sbuf.st_size)
425		goto done;
426	if (pipe(pdes) < 0)
427		goto done;
428	switch (fork()) {
429	case -1:			/* error */
430		(void)close(pdes[0]);
431		(void)close(pdes[1]);
432		goto done;
433	case 0:
434		/* child -- set stdin to pipe output */
435		if (pdes[0] != STDIN_FILENO) {
436			(void)dup2(pdes[0], STDIN_FILENO);
437			(void)close(pdes[0]);
438		}
439		(void)close(pdes[1]);
440		uid = geteuid();
441		if (setuid(getuid()) < 0) {
442			warnx("setuid failed");
443			_exit(1);
444		};
445		if (setgid(getegid()) < 0) {
446			warnx("setgid failed");
447			_exit(1);
448		}
449		if (setuid(uid) < 0) {
450			warnx("setuid failed");
451			_exit(1);
452		}
453		execl(_PATH_SENDMAIL, "sendmail", "-i", "-t", "-F",
454		    "\"Reminder Service\"", (char *)NULL);
455		warn(_PATH_SENDMAIL);
456		_exit(1);
457	}
458	/* parent -- write to pipe input */
459	(void)close(pdes[0]);
460
461	header[1].iov_base = header[3].iov_base = pw->pw_name;
462	header[1].iov_len = header[3].iov_len = strlen(pw->pw_name);
463	writev(pdes[1], header, 7);
464	while ((nread = read(fileno(fp), buf, sizeof(buf))) > 0)
465		(void)write(pdes[1], buf, nread);
466	(void)close(pdes[1]);
467done:	(void)fclose(fp);
468	(void)unlink(path);
469	while (wait(&status) >= 0);
470}
471