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 * 4. Neither the name of the University nor the names of its contributors
14 *    may be used to endorse or promote products derived from this software
15 *    without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * SUCH DAMAGE.
28 */
29
30#ifndef lint
31static const char copyright[] =
32"@(#) Copyright (c) 1989, 1993\n\
33	The Regents of the University of California.  All rights reserved.\n";
34#endif
35
36#if 0
37#ifndef lint
38static char sccsid[] = "@(#)calendar.c  8.3 (Berkeley) 3/25/94";
39#endif
40#endif
41
42#include <sys/cdefs.h>
43__FBSDID("$FreeBSD$");
44
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 <langinfo.h>
52#include <locale.h>
53#include <pwd.h>
54#include <stdio.h>
55#include <stdlib.h>
56#include <string.h>
57#include <unistd.h>
58
59#include "pathnames.h"
60#include "calendar.h"
61
62const char *calendarFile = "calendar";	/* default calendar file */
63static const char *calendarHomes[] = {".calendar", _PATH_INCLUDE}; /* HOME */
64static const char *calendarNoMail = "nomail";/* don't sent mail if file exist */
65
66static char path[MAXPATHLEN];
67
68struct fixs neaster, npaskha, ncny, nfullmoon, nnewmoon;
69struct fixs nmarequinox, nsepequinox, njunsolstice, ndecsolstice;
70
71#define	REPLACE(string, slen, struct_) \
72		if (strncasecmp(buf, (string), (slen)) == 0 && buf[(slen)]) { \
73			if (struct_.name != NULL)			      \
74				free(struct_.name);			      \
75			if ((struct_.name = strdup(buf + (slen))) == NULL)    \
76				errx(1, "cannot allocate memory");	      \
77			struct_.len = strlen(buf + (slen));		      \
78			continue;					      \
79		}
80void
81cal(void)
82{
83	char *pp, p;
84	FILE *fpin;
85	FILE *fpout;
86	int l;
87	int count, i;
88	int month[MAXCOUNT];
89	int day[MAXCOUNT];
90	int year[MAXCOUNT];
91	char **extradata;	/* strings of 20 length */
92	int flags;
93	static int d_first = -1;
94	char buf[2048 + 1];
95	struct event *events[MAXCOUNT];
96	struct tm tm;
97	char dbuf[80];
98
99	initcpp();
100	extradata = (char **)calloc(MAXCOUNT, sizeof(char *));
101	for (i = 0; i < MAXCOUNT; i++) {
102		extradata[i] = (char *)calloc(1, 20);
103	}
104
105	/* Unused */
106	tm.tm_sec = 0;
107	tm.tm_min = 0;
108	tm.tm_hour = 0;
109	tm.tm_wday = 0;
110
111	count = 0;
112	if ((fpin = opencalin()) == NULL) {
113		free(extradata);
114		return;
115	}
116	if ((fpout = opencalout()) == NULL) {
117		fclose(fpin);
118		free(extradata);
119		return;
120	}
121	while ((fpin = fincludegets(buf, sizeof(buf), fpin)) != NULL) {
122		if (*buf == '\0')
123			continue;
124		for (l = strlen(buf);
125		     l > 0 && isspace((unsigned char)buf[l - 1]);
126		     l--)
127			;
128		buf[l] = '\0';
129		if (buf[0] == '\0')
130			continue;
131
132		/* Parse special definitions: LANG, Easter, Paskha etc */
133		if (strncmp(buf, "LANG=", 5) == 0) {
134			(void)setlocale(LC_ALL, buf + 5);
135			d_first = (*nl_langinfo(D_MD_ORDER) == 'd');
136			setnnames();
137			continue;
138		}
139		REPLACE("Easter=", 7, neaster);
140		REPLACE("Paskha=", 7, npaskha);
141		REPLACE("ChineseNewYear=", 15, ncny);
142		REPLACE("NewMoon=", 8, nnewmoon);
143		REPLACE("FullMoon=", 9, nfullmoon);
144		REPLACE("MarEquinox=", 11, nmarequinox);
145		REPLACE("SepEquinox=", 11, nsepequinox);
146		REPLACE("JunSolstice=", 12, njunsolstice);
147		REPLACE("DecSolstice=", 12, ndecsolstice);
148		if (strncmp(buf, "SEQUENCE=", 9) == 0) {
149			setnsequences(buf + 9);
150			continue;
151		}
152
153		/*
154		 * If the line starts with a tab, the data has to be
155		 * added to the previous line
156		 */
157		if (buf[0] == '\t') {
158			for (i = 0; i < count; i++)
159				event_continue(events[i], buf);
160			continue;
161		}
162
163		/* Get rid of leading spaces (non-standard) */
164		while (isspace((unsigned char)buf[0]))
165			memcpy(buf, buf + 1, strlen(buf));
166
167		/* No tab in the line, then not a valid line */
168		if ((pp = strchr(buf, '\t')) == NULL)
169			continue;
170
171		/* Trim spaces in front of the tab */
172		while (isspace((unsigned char)pp[-1]))
173			pp--;
174
175		p = *pp;
176		*pp = '\0';
177		if ((count = parsedaymonth(buf, year, month, day, &flags,
178		    extradata)) == 0)
179			continue;
180		*pp = p;
181		if (count < 0) {
182			/* Show error status based on return value */
183			if (debug)
184				fprintf(stderr, "Ignored: %s\n", buf);
185			if (count == -1)
186				continue;
187			count = -count + 1;
188		}
189
190		/* Find the last tab */
191		while (pp[1] == '\t')
192			pp++;
193
194		if (d_first < 0)
195			d_first = (*nl_langinfo(D_MD_ORDER) == 'd');
196
197		for (i = 0; i < count; i++) {
198			tm.tm_mon = month[i] - 1;
199			tm.tm_mday = day[i];
200			tm.tm_year = year[i] - 1900;
201			(void)strftime(dbuf, sizeof(dbuf),
202			    d_first ? "%e %b" : "%b %e", &tm);
203			if (debug)
204				fprintf(stderr, "got %s\n", pp);
205			events[i] = event_add(year[i], month[i], day[i], dbuf,
206			    ((flags &= F_VARIABLE) != 0) ? 1 : 0, pp,
207			    extradata[i]);
208		}
209	}
210
211	event_print_all(fpout);
212	closecal(fpout);
213	free(extradata);
214}
215
216FILE *
217opencalin(void)
218{
219	size_t i;
220	int found;
221	struct stat sbuf;
222	FILE *fpin;
223
224	/* open up calendar file */
225	if ((fpin = fopen(calendarFile, "r")) == NULL) {
226		if (doall) {
227			if (chdir(calendarHomes[0]) != 0)
228				return (NULL);
229			if (stat(calendarNoMail, &sbuf) == 0)
230				return (NULL);
231			if ((fpin = fopen(calendarFile, "r")) == NULL)
232				return (NULL);
233		} else {
234			char *home = getenv("HOME");
235			if (home == NULL || *home == '\0')
236				errx(1, "cannot get home directory");
237			if (chdir(home) != 0)
238				errx(1, "cannot enter home directory");
239			for (found = i = 0; i < sizeof(calendarHomes) /
240			    sizeof(calendarHomes[0]); i++)
241				if (chdir(calendarHomes[i]) == 0 &&
242				    (fpin = fopen(calendarFile, "r")) != NULL) {
243					found = 1;
244					break;
245				}
246			if (!found)
247				errx(1,
248				    "can't open calendar file \"%s\": %s (%d)",
249				    calendarFile, strerror(errno), errno);
250		}
251	}
252	return (fpin);
253}
254
255FILE *
256opencalout(void)
257{
258	int fd;
259
260	/* not reading all calendar files, just set output to stdout */
261	if (!doall)
262		return (stdout);
263
264	/* set output to a temporary file, so if no output don't send mail */
265	snprintf(path, sizeof(path), "%s/_calXXXXXX", _PATH_TMP);
266	if ((fd = mkstemp(path)) < 0)
267		return (NULL);
268	return (fdopen(fd, "w+"));
269}
270
271void
272closecal(FILE *fp)
273{
274	uid_t uid;
275	struct stat sbuf;
276	int nread, pdes[2], status;
277	char buf[1024];
278
279	if (!doall)
280		return;
281
282	rewind(fp);
283	if (fstat(fileno(fp), &sbuf) || !sbuf.st_size)
284		goto done;
285	if (pipe(pdes) < 0)
286		goto done;
287	switch (fork()) {
288	case -1:			/* error */
289		(void)close(pdes[0]);
290		(void)close(pdes[1]);
291		goto done;
292	case 0:
293		/* child -- set stdin to pipe output */
294		if (pdes[0] != STDIN_FILENO) {
295			(void)dup2(pdes[0], STDIN_FILENO);
296			(void)close(pdes[0]);
297		}
298		(void)close(pdes[1]);
299		uid = geteuid();
300		if (setuid(getuid()) < 0) {
301			warnx("setuid failed");
302			_exit(1);
303		};
304		if (setgid(getegid()) < 0) {
305			warnx("setgid failed");
306			_exit(1);
307		}
308		if (setuid(uid) < 0) {
309			warnx("setuid failed");
310			_exit(1);
311		}
312		execl(_PATH_SENDMAIL, "sendmail", "-i", "-t", "-F",
313		    "\"Reminder Service\"", (char *)NULL);
314		warn(_PATH_SENDMAIL);
315		_exit(1);
316	}
317	/* parent -- write to pipe input */
318	(void)close(pdes[0]);
319
320	write(pdes[1], "From: \"Reminder Service\" <", 26);
321	write(pdes[1], pw->pw_name, strlen(pw->pw_name));
322	write(pdes[1], ">\nTo: <", 7);
323	write(pdes[1], pw->pw_name, strlen(pw->pw_name));
324	write(pdes[1], ">\nSubject: ", 11);
325	write(pdes[1], dayname, strlen(dayname));
326	write(pdes[1], "'s Calendar\nPrecedence: bulk\n\n", 30);
327
328	while ((nread = read(fileno(fp), buf, sizeof(buf))) > 0)
329		(void)write(pdes[1], buf, nread);
330	(void)close(pdes[1]);
331done:	(void)fclose(fp);
332	(void)unlink(path);
333	while (wait(&status) >= 0);
334}
335