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1.1 deraadt 1: /* $NetBSD: calendar.c,v 1.8 1995/09/02 05:38:38 jtc Exp $ */
2:
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. All advertising materials mentioning features or use of this software
16: * must display the following acknowledgement:
17: * This product includes software developed by the University of
18: * California, Berkeley and its contributors.
19: * 4. Neither the name of the University nor the names of its contributors
20: * may be used to endorse or promote products derived from this software
21: * without specific prior written permission.
22: *
23: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
24: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
25: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
26: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
27: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
28: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
29: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
30: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
31: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
32: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
33: * SUCH DAMAGE.
34: */
35:
36: #ifndef lint
37: static char copyright[] =
38: "@(#) Copyright (c) 1989, 1993\n\
39: The Regents of the University of California. All rights reserved.\n";
40: #endif /* not lint */
41:
42: #ifndef lint
43: #if 0
44: static char sccsid[] = "@(#)calendar.c 8.4 (Berkeley) 1/7/95";
45: #endif
46: static char rcsid[] = "$NetBSD: calendar.c,v 1.8 1995/09/02 05:38:38 jtc Exp $";
47: #endif /* not lint */
48:
49: #include <sys/param.h>
50: #include <sys/time.h>
51: #include <sys/stat.h>
52: #include <sys/uio.h>
53: #include <sys/wait.h>
54:
55: #include <ctype.h>
56: #include <err.h>
57: #include <errno.h>
58: #include <fcntl.h>
59: #include <pwd.h>
60: #include <stdio.h>
61: #include <stdlib.h>
62: #include <string.h>
63: #include <tzfile.h>
64: #include <unistd.h>
65:
66: #include "pathnames.h"
67:
68: struct passwd *pw;
69: int doall;
70:
71: void cal __P((void));
72: void closecal __P((FILE *));
73: int getday __P((char *));
74: int getfield __P((char *, char **, int *));
75: int getmonth __P((char *));
76: int isnow __P((char *));
77: FILE *opencal __P((void));
78: void settime __P((void));
79: void usage __P((void));
80:
81: int
82: main(argc, argv)
83: int argc;
84: char *argv[];
85: {
86: extern int optind;
87: int ch;
88: char *caldir;
89:
90: while ((ch = getopt(argc, argv, "-a")) != EOF)
91: switch (ch) {
92: case '-': /* backward contemptible */
93: case 'a':
94: if (getuid()) {
95: errno = EPERM;
96: err(1, NULL);
97: }
98: doall = 1;
99: break;
100: case '?':
101: default:
102: usage();
103: }
104: argc -= optind;
105: argv += optind;
106:
107: if (argc)
108: usage();
109:
110: settime();
111: if (doall)
112: while ((pw = getpwent()) != NULL) {
113: (void)setegid(pw->pw_gid);
114: (void)seteuid(pw->pw_uid);
115: if (!chdir(pw->pw_dir))
116: cal();
117: (void)seteuid(0);
118: }
119: else if ((caldir = getenv("CALENDAR_DIR")) != NULL) {
120: if(!chdir(caldir))
121: cal();
122: } else
123: cal();
124: exit(0);
125: }
126:
127: void
128: cal()
129: {
130: register int printing;
131: register char *p;
132: FILE *fp;
133: int ch;
134: char buf[2048 + 1];
135:
136: if ((fp = opencal()) == NULL)
137: return;
138: for (printing = 0; fgets(buf, sizeof(buf), stdin) != NULL;) {
139: if ((p = strchr(buf, '\n')) != NULL)
140: *p = '\0';
141: else
142: while ((ch = getchar()) != '\n' && ch != EOF);
143: if (buf[0] == '\0')
144: continue;
145: if (buf[0] != '\t')
146: printing = isnow(buf) ? 1 : 0;
147: if (printing)
148: (void)fprintf(fp, "%s\n", buf);
149: }
150: closecal(fp);
151: }
152:
153: struct iovec header[] = {
154: "From: ", 6,
155: NULL, 0,
156: " (Reminder Service)\nTo: ", 24,
157: NULL, 0,
158: "\nSubject: ", 10,
159: NULL, 0,
160: "'s Calendar\nPrecedence: bulk\n\n", 30,
161: };
162:
163: /* 1-based month, 0-based days, cumulative */
164: int daytab[][14] = {
165: 0, -1, 30, 58, 89, 119, 150, 180, 211, 242, 272, 303, 333, 364,
166: 0, -1, 30, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334, 365,
167: };
168: struct tm *tp;
169: int *cumdays, offset, yrdays;
170: char dayname[10];
171:
172: void
173: settime()
174: {
175: time_t now;
176:
177: (void)time(&now);
178: tp = localtime(&now);
179: if (isleap(tp->tm_year + 1900)) {
180: yrdays = DAYSPERLYEAR;
181: cumdays = daytab[1];
182: } else {
183: yrdays = DAYSPERNYEAR;
184: cumdays = daytab[0];
185: }
186: /* Friday displays Monday's events */
187: offset = tp->tm_wday == 5 ? 3 : 1;
188: header[5].iov_base = dayname;
189: header[5].iov_len = strftime(dayname, sizeof(dayname), "%A", tp);
190: }
191:
192: /*
193: * Possible date formats include any combination of:
194: * 3-charmonth (January, Jan, Jan)
195: * 3-charweekday (Friday, Monday, mon.)
196: * numeric month or day (1, 2, 04)
197: *
198: * Any character may separate them, or they may not be separated. Any line,
199: * following a line that is matched, that starts with "whitespace", is shown
200: * along with the matched line.
201: */
202: int
203: isnow(endp)
204: char *endp;
205: {
206: int day, flags, month, v1, v2;
207:
208: #define F_ISMONTH 0x01
209: #define F_ISDAY 0x02
210: flags = 0;
211: /* didn't recognize anything, skip it */
212: if (!(v1 = getfield(endp, &endp, &flags)))
213: return (0);
214: if (flags & F_ISDAY || v1 > 12) {
215: /* found a day */
216: day = v1;
217: month = tp->tm_mon + 1;
218: } else if (flags & F_ISMONTH) {
219: month = v1;
220: /* if no recognizable day, assume the first */
221: if (!(day = getfield(endp, &endp, &flags)))
222: day = 1;
223: } else {
224: v2 = getfield(endp, &endp, &flags);
225: if (flags & F_ISMONTH) {
226: day = v1;
227: month = v2;
228: } else {
229: /* F_ISDAY set, v2 > 12, or no way to tell */
230: month = v1;
231: /* if no recognizable day, assume the first */
232: day = v2 ? v2 : 1;
233: }
234: }
235: if (flags & F_ISDAY)
236: day = tp->tm_mday + (((day - 1) - tp->tm_wday + 7) % 7);
237: day = cumdays[month] + day;
238:
239: /* if today or today + offset days */
240: if (day >= tp->tm_yday && day <= tp->tm_yday + offset)
241: return (1);
242: /* if number of days left in this year + days to event in next year */
243: if (yrdays - tp->tm_yday + day <= offset)
244: return (1);
245: return (0);
246: }
247:
248: int
249: getfield(p, endp, flags)
250: char *p, **endp;
251: int *flags;
252: {
253: int val;
254: char *start, savech;
255:
256: for (; !isdigit(*p) && !isalpha(*p) && *p != '*'; ++p);
257: if (*p == '*') { /* `*' is current month */
258: *flags |= F_ISMONTH;
259: *endp = p+1;
260: return (tp->tm_mon + 1);
261: }
262: if (isdigit(*p)) {
263: val = strtol(p, &p, 10); /* if 0, it's failure */
264: for (; !isdigit(*p) && !isalpha(*p) && *p != '*'; ++p);
265: *endp = p;
266: return (val);
267: }
268: for (start = p; isalpha(*++p););
269: savech = *p;
270: *p = '\0';
271: if ((val = getmonth(start)) != 0)
272: *flags |= F_ISMONTH;
273: else if ((val = getday(start)) != 0)
274: *flags |= F_ISDAY;
275: else {
276: *p = savech;
277: return (0);
278: }
279: for (*p = savech; !isdigit(*p) && !isalpha(*p) && *p != '*'; ++p);
280: *endp = p;
281: return (val);
282: }
283:
284: char path[MAXPATHLEN + 1];
285:
286: FILE *
287: opencal()
288: {
289: int fd, pdes[2];
290:
291: /* open up calendar file as stdin */
292: if (!freopen("calendar", "r", stdin)) {
293: if (doall)
294: return (NULL);
295: errx(1, "no calendar file.");
296: }
297: if (pipe(pdes) < 0)
298: return (NULL);
299: switch (vfork()) {
300: case -1: /* error */
301: (void)close(pdes[0]);
302: (void)close(pdes[1]);
303: return (NULL);
304: case 0:
305: /* child -- stdin already setup, set stdout to pipe input */
306: if (pdes[1] != STDOUT_FILENO) {
307: (void)dup2(pdes[1], STDOUT_FILENO);
308: (void)close(pdes[1]);
309: }
310: (void)close(pdes[0]);
311: execl(_PATH_CPP, "cpp", "-P", "-I.", _PATH_INCLUDE, NULL);
312: warn("execl: %s", _PATH_CPP);
313: _exit(1);
314: }
315: /* parent -- set stdin to pipe output */
316: (void)dup2(pdes[0], STDIN_FILENO);
317: (void)close(pdes[0]);
318: (void)close(pdes[1]);
319:
320: /* not reading all calendar files, just set output to stdout */
321: if (!doall)
322: return (stdout);
323:
324: /* set output to a temporary file, so if no output don't send mail */
325: (void)snprintf(path, sizeof(path), "%s/_calXXXXXX", _PATH_TMP);
326: if ((fd = mkstemp(path)) < 0)
327: return (NULL);
328: return (fdopen(fd, "w+"));
329: }
330:
331: void
332: closecal(fp)
333: FILE *fp;
334: {
335: struct stat sbuf;
336: int nread, pdes[2], status;
337: char buf[1024];
338:
339: if (!doall)
340: return;
341:
342: (void)rewind(fp);
343: if (fstat(fileno(fp), &sbuf) || !sbuf.st_size)
344: goto done;
345: if (pipe(pdes) < 0)
346: goto done;
347: switch (vfork()) {
348: case -1: /* error */
349: (void)close(pdes[0]);
350: (void)close(pdes[1]);
351: goto done;
352: case 0:
353: /* child -- set stdin to pipe output */
354: if (pdes[0] != STDIN_FILENO) {
355: (void)dup2(pdes[0], STDIN_FILENO);
356: (void)close(pdes[0]);
357: }
358: (void)close(pdes[1]);
359: execl(_PATH_SENDMAIL, "sendmail", "-i", "-t", "-F",
360: "\"Reminder Service\"", "-f", "root", NULL);
361: warn("execl: %s", _PATH_SENDMAIL);
362: _exit(1);
363: }
364: /* parent -- write to pipe input */
365: (void)close(pdes[0]);
366:
367: header[1].iov_base = header[3].iov_base = pw->pw_name;
368: header[1].iov_len = header[3].iov_len = strlen(pw->pw_name);
369: writev(pdes[1], header, 7);
370: while ((nread = read(fileno(fp), buf, sizeof(buf))) > 0)
371: (void)write(pdes[1], buf, nread);
372: (void)close(pdes[1]);
373: done: (void)fclose(fp);
374: (void)unlink(path);
375: while (wait(&status) >= 0);
376: }
377:
378: static char *months[] = {
379: "jan", "feb", "mar", "apr", "may", "jun",
380: "jul", "aug", "sep", "oct", "nov", "dec", NULL,
381: };
382:
383: int
384: getmonth(s)
385: register char *s;
386: {
387: register char **p;
388:
389: for (p = months; *p; ++p)
390: if (!strncasecmp(s, *p, 3))
391: return ((p - months) + 1);
392: return (0);
393: }
394:
395: static char *days[] = {
396: "sun", "mon", "tue", "wed", "thu", "fri", "sat", NULL,
397: };
398:
399: int
400: getday(s)
401: register char *s;
402: {
403: register char **p;
404:
405: for (p = days; *p; ++p)
406: if (!strncasecmp(s, *p, 3))
407: return ((p - days) + 1);
408: return (0);
409: }
410:
411: void
412: usage()
413: {
414: (void)fprintf(stderr, "usage: calendar [-a]\n");
415: exit(1);
416: }