io.c revision 251647 
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: head/usr.bin/calendar/io.c 251647 2013-06-12 07:52:49Z grog $");
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 *fp;
85	int ch, l;
86	int count, i;
87	int month[MAXCOUNT];
88	int day[MAXCOUNT];
89	int year[MAXCOUNT];
90	char **extradata;	/* strings of 20 length */
91	int flags;
92	static int d_first = -1;
93	char buf[2048 + 1];
94	struct event *events[MAXCOUNT];
95	struct tm tm;
96	char dbuf[80];
97
98	extradata = (char **)calloc(MAXCOUNT, sizeof(char *));
99	for (i = 0; i < MAXCOUNT; i++) {
100		extradata[i] = (char *)calloc(1, 20);
101	}
102
103	/* Unused */
104	tm.tm_sec = 0;
105	tm.tm_min = 0;
106	tm.tm_hour = 0;
107	tm.tm_wday = 0;
108
109	count = 0;
110	if ((fp = opencal()) == NULL) {
111		free(extradata);
112		return;
113	}
114	while (fgets(buf, sizeof(buf), stdin) != NULL) {
115		if ((pp = strchr(buf, '\n')) != NULL)
116			*pp = '\0';
117		else
118			/* Flush this line */
119			while ((ch = getchar()) != '\n' && ch != EOF);
120		for (l = strlen(buf);
121		     l > 0 && isspace((unsigned char)buf[l - 1]);
122		     l--)
123			;
124		buf[l] = '\0';
125		if (buf[0] == '\0')
126			continue;
127
128		/* Parse special definitions: LANG, Easter, Paskha etc */
129		if (strncmp(buf, "LANG=", 5) == 0) {
130			(void)setlocale(LC_ALL, buf + 5);
131			d_first = (*nl_langinfo(D_MD_ORDER) == 'd');
132			setnnames();
133			continue;
134		}
135		REPLACE("Easter=", 7, neaster);
136		REPLACE("Paskha=", 7, npaskha);
137		REPLACE("ChineseNewYear=", 15, ncny);
138		REPLACE("NewMoon=", 8, nnewmoon);
139		REPLACE("FullMoon=", 9, nfullmoon);
140		REPLACE("MarEquinox=", 11, nmarequinox);
141		REPLACE("SepEquinox=", 11, nsepequinox);
142		REPLACE("JunSolstice=", 12, njunsolstice);
143		REPLACE("DecSolstice=", 12, ndecsolstice);
144		if (strncmp(buf, "SEQUENCE=", 9) == 0) {
145			setnsequences(buf + 9);
146			continue;
147		}
148
149		/*
150		 * If the line starts with a tab, the data has to be
151		 * added to the previous line
152		 */
153		if (buf[0] == '\t') {
154			for (i = 0; i < count; i++)
155				event_continue(events[i], buf);
156			continue;
157		}
158
159		/* Get rid of leading spaces (non-standard) */
160		while (isspace((unsigned char)buf[0]))
161			memcpy(buf, buf + 1, strlen(buf));
162
163		/* No tab in the line, then not a valid line */
164		if ((pp = strchr(buf, '\t')) == NULL)
165			continue;
166
167		/* Trim spaces in front of the tab */
168		while (isspace((unsigned char)pp[-1]))
169			pp--;
170
171		p = *pp;
172		*pp = '\0';
173		if ((count = parsedaymonth(buf, year, month, day, &flags,
174		    extradata)) == 0)
175			continue;
176		*pp = p;
177		if (count < 0) {
178			/* Show error status based on return value */
179			if (debug)
180				fprintf(stderr, "Ignored: %s\n", buf);
181			if (count == -1)
182				continue;
183			count = -count + 1;
184		}
185
186		/* Find the last tab */
187		while (pp[1] == '\t')
188			pp++;
189
190		if (d_first < 0)
191			d_first = (*nl_langinfo(D_MD_ORDER) == 'd');
192
193		for (i = 0; i < count; i++) {
194			tm.tm_mon = month[i] - 1;
195			tm.tm_mday = day[i];
196			tm.tm_year = year[i] - 1900;
197			(void)strftime(dbuf, sizeof(dbuf),
198			    d_first ? "%e %b" : "%b %e", &tm);
199			if (debug)
200				fprintf(stderr, "got %s\n", pp);
201			events[i] = event_add(year[i], month[i], day[i], dbuf,
202			    ((flags &= F_VARIABLE) != 0) ? 1 : 0, pp,
203			    extradata[i]);
204		}
205	}
206
207	event_print_all(fp);
208	closecal(fp);
209	free(extradata);
210}
211
212FILE *
213opencal(void)
214{
215	uid_t uid;
216	size_t i;
217	int fd, found, pdes[2];
218	struct stat sbuf;
219
220	/* open up calendar file as stdin */
221	if (!freopen(calendarFile, "r", stdin)) {
222		if (doall) {
223			if (chdir(calendarHomes[0]) != 0)
224				return (NULL);
225			if (stat(calendarNoMail, &sbuf) == 0)
226				return (NULL);
227			if (!freopen(calendarFile, "r", stdin))
228				return (NULL);
229		} else {
230			char *home = getenv("HOME");
231			if (home == NULL || *home == '\0')
232				errx(1, "cannot get home directory");
233			if (chdir(home) != 0)
234				errx(1, "cannot enter home directory");
235			for (found = i = 0; i < sizeof(calendarHomes) /
236			    sizeof(calendarHomes[0]); i++)
237				if (chdir(calendarHomes[i]) == 0 &&
238				    freopen(calendarFile, "r", stdin)) {
239					found = 1;
240					break;
241				}
242			if (!found)
243				errx(1,
244				    "can't open calendar file \"%s\": %s (%d)",
245				    calendarFile, strerror(errno), errno);
246		}
247	}
248	if (pipe(pdes) < 0)
249		return (NULL);
250	switch (fork()) {
251	case -1:			/* error */
252		(void)close(pdes[0]);
253		(void)close(pdes[1]);
254		return (NULL);
255	case 0:
256		/* child -- stdin already setup, set stdout to pipe input */
257		if (pdes[1] != STDOUT_FILENO) {
258			(void)dup2(pdes[1], STDOUT_FILENO);
259			(void)close(pdes[1]);
260		}
261		(void)close(pdes[0]);
262		uid = geteuid();
263		if (setuid(getuid()) < 0) {
264			warnx("first setuid failed");
265			_exit(1);
266		};
267		if (setgid(getegid()) < 0) {
268			warnx("setgid failed");
269			_exit(1);
270		}
271		if (setuid(uid) < 0) {
272			warnx("setuid failed");
273			_exit(1);
274		}
275		execl(_PATH_CPP, "cpp", "-P",
276		    "-traditional-cpp", "-nostdinc",	/* GCC specific opts */
277		    "-I.", "-I", _PATH_INCLUDE, (char *)NULL);
278		warn(_PATH_CPP);
279		_exit(1);
280	}
281	/* parent -- set stdin to pipe output */
282	(void)dup2(pdes[0], STDIN_FILENO);
283	(void)close(pdes[0]);
284	(void)close(pdes[1]);
285
286	/* not reading all calendar files, just set output to stdout */
287	if (!doall)
288		return (stdout);
289
290	/* set output to a temporary file, so if no output don't send mail */
291	(void)snprintf(path, sizeof(path), "%s/_calXXXXXX", _PATH_TMP);
292	if ((fd = mkstemp(path)) < 0)
293		return (NULL);
294	return (fdopen(fd, "w+"));
295}
296
297void
298closecal(FILE *fp)
299{
300	uid_t uid;
301	struct stat sbuf;
302	int nread, pdes[2], status;
303	char buf[1024];
304
305	if (!doall)
306		return;
307
308	rewind(fp);
309	if (fstat(fileno(fp), &sbuf) || !sbuf.st_size)
310		goto done;
311	if (pipe(pdes) < 0)
312		goto done;
313	switch (fork()) {
314	case -1:			/* error */
315		(void)close(pdes[0]);
316		(void)close(pdes[1]);
317		goto done;
318	case 0:
319		/* child -- set stdin to pipe output */
320		if (pdes[0] != STDIN_FILENO) {
321			(void)dup2(pdes[0], STDIN_FILENO);
322			(void)close(pdes[0]);
323		}
324		(void)close(pdes[1]);
325		uid = geteuid();
326		if (setuid(getuid()) < 0) {
327			warnx("setuid failed");
328			_exit(1);
329		};
330		if (setgid(getegid()) < 0) {
331			warnx("setgid failed");
332			_exit(1);
333		}
334		if (setuid(uid) < 0) {
335			warnx("setuid failed");
336			_exit(1);
337		}
338		execl(_PATH_SENDMAIL, "sendmail", "-i", "-t", "-F",
339		    "\"Reminder Service\"", (char *)NULL);
340		warn(_PATH_SENDMAIL);
341		_exit(1);
342	}
343	/* parent -- write to pipe input */
344	(void)close(pdes[0]);
345
346	write(pdes[1], "From: \"Reminder Service\" <", 26);
347	write(pdes[1], pw->pw_name, strlen(pw->pw_name));
348	write(pdes[1], ">\nTo: <", 7);
349	write(pdes[1], pw->pw_name, strlen(pw->pw_name));
350	write(pdes[1], ">\nSubject: ", 11);
351	write(pdes[1], dayname, strlen(dayname));
352	write(pdes[1], "'s Calendar\nPrecedence: bulk\n\n", 30);
353
354	while ((nread = read(fileno(fp), buf, sizeof(buf))) > 0)
355		(void)write(pdes[1], buf, nread);
356	(void)close(pdes[1]);
357done:	(void)fclose(fp);
358	(void)unlink(path);
359	while (wait(&status) >= 0);
360}
361