412 lines
9.6 KiB
C
412 lines
9.6 KiB
C
/*
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* Copyright (c) 1989, 1993, 1994
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#ifndef lint
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static char copyright[] =
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"@(#) Copyright (c) 1989, 1993\n\
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The Regents of the University of California. All rights reserved.\n";
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#endif /* not lint */
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#ifndef lint
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static char sccsid[] = "@(#)calendar.c 8.3 (Berkeley) 3/25/94";
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#endif /* not lint */
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#include <sys/param.h>
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#include <sys/time.h>
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#include <sys/stat.h>
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#include <sys/uio.h>
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#include <sys/wait.h>
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#include <ctype.h>
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#include <err.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <pwd.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <tzfile.h>
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#include <unistd.h>
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#include "pathnames.h"
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struct passwd *pw;
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int doall;
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void cal __P((void));
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void closecal __P((FILE *));
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int getday __P((char *));
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int getfield __P((char *, char **, int *));
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int getmonth __P((char *));
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int isnow __P((char *));
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FILE *opencal __P((void));
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void settime __P((void));
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void usage __P((void));
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int
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main(argc, argv)
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int argc;
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char *argv[];
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{
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extern int optind;
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int ch;
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while ((ch = getopt(argc, argv, "-a")) != EOF)
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switch (ch) {
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case '-': /* backward contemptible */
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case 'a':
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if (getuid()) {
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errno = EPERM;
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err(1, NULL);
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}
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doall = 1;
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break;
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case '?':
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default:
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usage();
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}
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argc -= optind;
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argv += optind;
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if (argc)
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usage();
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settime();
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if (doall)
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while ((pw = getpwent()) != NULL) {
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(void)setegid(pw->pw_gid);
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(void)seteuid(pw->pw_uid);
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if (!chdir(pw->pw_dir))
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cal();
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(void)seteuid(0);
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}
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else
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cal();
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exit(0);
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}
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void
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cal()
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{
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register int printing;
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register char *p;
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FILE *fp;
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int ch;
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char buf[2048 + 1];
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if ((fp = opencal()) == NULL)
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return;
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for (printing = 0; fgets(buf, sizeof(buf), stdin) != NULL;) {
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if ((p = strchr(buf, '\n')) != NULL)
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*p = '\0';
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else
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while ((ch = getchar()) != '\n' && ch != EOF);
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if (buf[0] == '\0')
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continue;
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if (buf[0] != '\t')
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printing = isnow(buf) ? 1 : 0;
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if (printing)
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(void)fprintf(fp, "%s\n", buf);
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}
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closecal(fp);
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}
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struct iovec header[] = {
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"From: ", 6,
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NULL, 0,
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" (Reminder Service)\nTo: ", 24,
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NULL, 0,
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"\nSubject: ", 10,
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NULL, 0,
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"'s Calendar\nPrecedence: bulk\n\n", 30,
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};
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/* 1-based month, 0-based days, cumulative */
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int daytab[][14] = {
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0, -1, 30, 58, 89, 119, 150, 180, 211, 242, 272, 303, 333, 364,
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0, -1, 30, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334, 365,
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};
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struct tm *tp;
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int *cumdays, offset, yrdays;
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char dayname[10];
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void
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settime()
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{
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time_t now;
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(void)time(&now);
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tp = localtime(&now);
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if (isleap(tp->tm_year + 1900)) {
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yrdays = DAYSPERLYEAR;
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cumdays = daytab[1];
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} else {
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yrdays = DAYSPERNYEAR;
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cumdays = daytab[0];
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}
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/* Friday displays Monday's events */
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offset = tp->tm_wday == 5 ? 3 : 1;
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header[5].iov_base = dayname;
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header[5].iov_len = strftime(dayname, sizeof(dayname), "%A", tp);
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}
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/*
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* Possible date formats include any combination of:
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* 3-charmonth (January, Jan, Jan)
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* 3-charweekday (Friday, Monday, mon.)
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* numeric month or day (1, 2, 04)
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*
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* Any character may separate them, or they may not be separated. Any line,
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* following a line that is matched, that starts with "whitespace", is shown
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* along with the matched line.
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*/
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int
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isnow(endp)
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char *endp;
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{
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int day, flags, month, v1, v2;
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#define F_ISMONTH 0x01
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#define F_ISDAY 0x02
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flags = 0;
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/* didn't recognize anything, skip it */
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if (!(v1 = getfield(endp, &endp, &flags)))
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return (0);
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if (flags & F_ISDAY || v1 > 12) {
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/* found a day */
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day = v1;
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/* if no recognizable month, assume just a day alone */
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if (!(month = getfield(endp, &endp, &flags)))
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month = tp->tm_mon + 1;
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} else if (flags & F_ISMONTH) {
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month = v1;
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/* if no recognizable day, assume the first */
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if (!(day = getfield(endp, &endp, &flags)))
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day = 1;
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} else {
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v2 = getfield(endp, &endp, &flags);
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if (flags & F_ISMONTH) {
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day = v1;
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month = v2;
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} else {
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/* F_ISDAY set, v2 > 12, or no way to tell */
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month = v1;
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/* if no recognizable day, assume the first */
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day = v2 ? v2 : 1;
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}
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}
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if (flags & F_ISDAY)
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day = tp->tm_mday + (((day - 1) - tp->tm_wday + 7) % 7);
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day = cumdays[month] + day;
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/* if today or today + offset days */
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if (day >= tp->tm_yday && day <= tp->tm_yday + offset)
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return (1);
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/* if number of days left in this year + days to event in next year */
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if (yrdays - tp->tm_yday + day <= offset)
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return (1);
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return (0);
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}
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int
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getfield(p, endp, flags)
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char *p, **endp;
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int *flags;
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{
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int val;
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char *start, savech;
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for (; !isdigit(*p) && !isalpha(*p) && *p != '*'; ++p);
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if (*p == '*') { /* `*' is current month */
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*flags |= F_ISMONTH;
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*endp = p+1;
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return (tp->tm_mon + 1);
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}
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if (isdigit(*p)) {
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val = strtol(p, &p, 10); /* if 0, it's failure */
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for (; !isdigit(*p) && !isalpha(*p) && *p != '*'; ++p);
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*endp = p;
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return (val);
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}
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for (start = p; isalpha(*++p););
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savech = *p;
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*p = '\0';
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if ((val = getmonth(start)) != 0)
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*flags |= F_ISMONTH;
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else if ((val = getday(start)) != 0)
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*flags |= F_ISDAY;
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else {
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*p = savech;
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return (0);
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}
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for (*p = savech; !isdigit(*p) && !isalpha(*p) && *p != '*'; ++p);
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*endp = p;
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return (val);
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}
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char path[MAXPATHLEN + 1];
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FILE *
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opencal()
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{
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int fd, pdes[2];
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/* open up calendar file as stdin */
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if (!freopen("calendar", "r", stdin)) {
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if (doall)
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return (NULL);
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errx(1, "no calendar file.");
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}
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if (pipe(pdes) < 0)
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return (NULL);
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switch (vfork()) {
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case -1: /* error */
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(void)close(pdes[0]);
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(void)close(pdes[1]);
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return (NULL);
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case 0:
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/* child -- stdin already setup, set stdout to pipe input */
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if (pdes[1] != STDOUT_FILENO) {
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(void)dup2(pdes[1], STDOUT_FILENO);
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(void)close(pdes[1]);
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}
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(void)close(pdes[0]);
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execl(_PATH_CPP, "cpp", "-I.", _PATH_INCLUDE, NULL);
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(void)fprintf(stderr,
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"calendar: execl: %s: %s.\n", _PATH_CPP, strerror(errno));
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_exit(1);
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}
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/* parent -- set stdin to pipe output */
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(void)dup2(pdes[0], STDIN_FILENO);
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(void)close(pdes[0]);
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(void)close(pdes[1]);
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/* not reading all calendar files, just set output to stdout */
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if (!doall)
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return (stdout);
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/* set output to a temporary file, so if no output don't send mail */
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(void)snprintf(path, sizeof(path), "%s/_calXXXXXX", _PATH_TMP);
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if ((fd = mkstemp(path)) < 0)
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return (NULL);
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return (fdopen(fd, "w+"));
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}
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void
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closecal(fp)
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FILE *fp;
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{
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struct stat sbuf;
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int nread, pdes[2], status;
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char buf[1024];
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if (!doall)
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return;
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(void)rewind(fp);
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if (fstat(fileno(fp), &sbuf) || !sbuf.st_size)
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goto done;
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if (pipe(pdes) < 0)
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goto done;
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switch (vfork()) {
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case -1: /* error */
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(void)close(pdes[0]);
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(void)close(pdes[1]);
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goto done;
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case 0:
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/* child -- set stdin to pipe output */
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if (pdes[0] != STDIN_FILENO) {
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(void)dup2(pdes[0], STDIN_FILENO);
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(void)close(pdes[0]);
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}
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(void)close(pdes[1]);
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execl(_PATH_SENDMAIL, "sendmail", "-i", "-t", "-F",
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"\"Reminder Service\"", "-f", "root", NULL);
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(void)fprintf(stderr,
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"calendar: %s: %s.\n", _PATH_SENDMAIL, strerror(errno));
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_exit(1);
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}
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/* parent -- write to pipe input */
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(void)close(pdes[0]);
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header[1].iov_base = header[3].iov_base = pw->pw_name;
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header[1].iov_len = header[3].iov_len = strlen(pw->pw_name);
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writev(pdes[1], header, 7);
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while ((nread = read(fileno(fp), buf, sizeof(buf))) > 0)
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(void)write(pdes[1], buf, nread);
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(void)close(pdes[1]);
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done: (void)fclose(fp);
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(void)unlink(path);
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while (wait(&status) >= 0);
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}
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static char *months[] = {
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"jan", "feb", "mar", "apr", "may", "jun",
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"jul", "aug", "sep", "oct", "nov", "dec", NULL,
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};
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int
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getmonth(s)
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register char *s;
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{
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register char **p;
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for (p = months; *p; ++p)
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if (!strncasecmp(s, *p, 3))
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return ((p - months) + 1);
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return (0);
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}
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static char *days[] = {
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"sun", "mon", "tue", "wed", "thu", "fri", "sat", NULL,
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};
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int
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getday(s)
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register char *s;
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{
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register char **p;
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for (p = days; *p; ++p)
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if (!strncasecmp(s, *p, 3))
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return ((p - days) + 1);
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return (0);
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}
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void
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usage()
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{
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(void)fprintf(stderr, "usage: calendar [-a]\n");
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exit(1);
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}
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