518 lines
13 KiB
C
518 lines
13 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 const 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
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#if 0
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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
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#endif
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/types.h>
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#include <sys/param.h>
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#include <sys/stat.h>
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#include <sys/time.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 <langinfo.h>
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#include <locale.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 <unistd.h>
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#include "pathnames.h"
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#include "calendar.h"
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/*
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* Event sorting related functions:
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* - Use event_add() to create a new event
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* - Use event_continue() to add more text to the last added event
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* - Use event_print_all() to display them in time chronological order
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*/
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static struct event *event_add(struct event *, int, int, char *, int, char *);
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static void event_continue(struct event *events, char *txt);
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static void event_print_all(FILE *fp, struct event *events);
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struct event {
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int month;
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int day;
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int var;
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char *date;
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char *text;
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struct event *next;
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};
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const char *calendarFile = "calendar"; /* default calendar file */
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const char *calendarHomes[] = {".calendar", _PATH_INCLUDE}; /* HOME */
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const char *calendarNoMail = "nomail"; /* don't sent mail if this file exist */
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char path[MAXPATHLEN];
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struct fixs neaster, npaskha;
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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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void
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cal(void)
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{
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int printing;
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char *p;
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FILE *fp;
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int ch, l;
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int month;
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int day;
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int var;
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static int d_first = -1;
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char buf[2048 + 1];
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struct event *events = NULL;
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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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for (l = strlen(buf);
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l > 0 && isspace((unsigned char)buf[l - 1]);
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l--)
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;
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buf[l] = '\0';
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if (buf[0] == '\0')
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continue;
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if (strncmp(buf, "LANG=", 5) == 0) {
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(void)setlocale(LC_ALL, buf + 5);
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d_first = (*nl_langinfo(D_MD_ORDER) == 'd');
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setnnames();
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continue;
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}
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if (strncasecmp(buf, "Easter=", 7) == 0 && buf[7]) {
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if (neaster.name != NULL)
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free(neaster.name);
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if ((neaster.name = strdup(buf + 7)) == NULL)
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errx(1, "cannot allocate memory");
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neaster.len = strlen(buf + 7);
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continue;
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}
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if (strncasecmp(buf, "Paskha=", 7) == 0 && buf[7]) {
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if (npaskha.name != NULL)
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free(npaskha.name);
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if ((npaskha.name = strdup(buf + 7)) == NULL)
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errx(1, "cannot allocate memory");
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npaskha.len = strlen(buf + 7);
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continue;
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}
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if (buf[0] != '\t') {
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printing = isnow(buf, &month, &day, &var) ? 1 : 0;
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if ((p = strchr(buf, '\t')) == NULL)
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continue;
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if (p > buf && p[-1] == '*')
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var = 1;
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if (printing) {
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struct tm tm;
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char dbuf[80];
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if (d_first < 0)
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d_first =
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(*nl_langinfo(D_MD_ORDER) == 'd');
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tm.tm_sec = 0; /* unused */
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tm.tm_min = 0; /* unused */
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tm.tm_hour = 0; /* unused */
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tm.tm_wday = 0; /* unused */
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tm.tm_mon = month - 1;
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tm.tm_mday = day;
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tm.tm_year = tp->tm_year; /* unused */
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(void)strftime(dbuf, sizeof(dbuf),
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d_first ? "%e %b" : "%b %e", &tm);
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events = event_add(events, month, day, dbuf,
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var, p);
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}
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} else {
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if (printing)
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event_continue(events, buf);
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}
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}
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event_print_all(fp, events);
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closecal(fp);
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}
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static struct event *
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event_add(struct event *events, int month, int day,
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char *date, int var, char *txt)
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{
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struct event *e;
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/*
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* Creating a new event:
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* - Create a new event
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* - Copy the machine readable day and month
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* - Copy the human readable and language specific date
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* - Copy the text of the event
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*/
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e = (struct event *)calloc(1, sizeof(struct event));
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if (e == NULL)
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errx(1, "event_add: cannot allocate memory");
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e->month = month;
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e->day = day;
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e->var = var;
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e->date = strdup(date);
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if (e->date == NULL)
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errx(1, "event_add: cannot allocate memory");
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e->text = strdup(txt);
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if (e->text == NULL)
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errx(1, "event_add: cannot allocate memory");
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e->next = events;
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return e;
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}
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static void
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event_continue(struct event *e, char *txt)
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{
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char *text;
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/*
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* Adding text to the event:
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* - Save a copy of the old text (unknown length, so strdup())
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* - Allocate enough space for old text + \n + new text + 0
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* - Store the old text + \n + new text
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* - Destroy the saved copy.
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*/
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text = strdup(e->text);
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if (text == NULL)
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errx(1, "event_continue: cannot allocate memory");
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free(e->text);
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e->text = (char *)malloc(strlen(text) + strlen(txt) + 3);
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if (e->text == NULL)
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errx(1, "event_continue: cannot allocate memory");
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strcpy(e->text, text);
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strcat(e->text, "\n");
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strcat(e->text, txt);
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free(text);
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return;
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}
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static void
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event_print_all(FILE *fp, struct event *events)
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{
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struct event *e, *e_next;
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int daycounter;
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int day, month;
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/*
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* Print all events:
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* - We know the number of days to be counted (f_dayAfter + f_dayBefore)
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* - We know the current day of the year ("now" - f_dayBefore + counter)
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* - We know the number of days in the year (yrdays, set in settime())
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* - So we know the date on which the current daycounter is on the
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* calendar in days and months.
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* - Go through the list of events, and print all matching dates
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*/
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for (daycounter = 0; daycounter <= f_dayAfter + f_dayBefore;
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daycounter++) {
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day = tp->tm_yday - f_dayBefore + daycounter;
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if (day < 0)
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day += yrdays;
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if (day >= yrdays)
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day -= yrdays;
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/*
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* When we know the day of the year, we can determine the day
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* of the month and the month.
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*/
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month = 1;
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while (month <= 12) {
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if (day <= cumdays[month])
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break;
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month++;
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}
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month--;
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day -= cumdays[month];
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#ifdef DEBUG
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fprintf(stderr, "event_print_allmonth: %d, day: %d\n",
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month, day);
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#endif
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/*
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* Go through all events and print the text of the matching
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* dates
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*/
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for (e = events; e != NULL; e = e_next) {
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e_next = e->next;
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if (month != e->month || day != e->day)
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continue;
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(void)fprintf(fp, "%s%c%s\n", e->date,
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e->var ? '*' : ' ', e->text);
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}
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}
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}
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int
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getfield(char *p, char **endp, int *flags)
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{
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int val, var;
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char *start, savech;
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for (; !isdigit((unsigned char)*p) && !isalpha((unsigned char)*p)
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&& *p != '*'; ++p)
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;
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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((unsigned char)*p)) {
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val = strtol(p, &p, 10); /* if 0, it's failure */
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for (; !isdigit((unsigned char)*p)
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&& !isalpha((unsigned char)*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((unsigned char)*++p););
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/* Sunday-1 */
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if (*p == '+' || *p == '-')
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for(; isdigit((unsigned char)*++p);)
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;
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savech = *p;
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*p = '\0';
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/* Month */
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if ((val = getmonth(start)) != 0)
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*flags |= F_ISMONTH;
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/* Day */
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else if ((val = getday(start)) != 0) {
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*flags |= F_ISDAY;
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/* variable weekday */
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if ((var = getdayvar(start)) != 0) {
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if (var <= 5 && var >= -4)
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val += var * 10;
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#ifdef DEBUG
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printf("var: %d\n", var);
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#endif
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}
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}
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/* Easter */
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else if ((val = geteaster(start, tp->tm_year + 1900)) != 0)
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*flags |= F_EASTER;
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/* Paskha */
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else if ((val = getpaskha(start, tp->tm_year + 1900)) != 0)
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*flags |= F_EASTER;
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/* undefined rest */
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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((unsigned char)*p)
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&& !isalpha((unsigned char)*p) && *p != '*'; ++p)
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;
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*endp = p;
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return (val);
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}
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FILE *
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opencal(void)
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{
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uid_t uid;
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size_t i;
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int fd, found, pdes[2];
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struct stat sbuf;
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/* open up calendar file as stdin */
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if (!freopen(calendarFile, "r", stdin)) {
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if (doall) {
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if (chdir(calendarHomes[0]) != 0)
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return (NULL);
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if (stat(calendarNoMail, &sbuf) == 0)
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return (NULL);
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if (!freopen(calendarFile, "r", stdin))
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return (NULL);
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} else {
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char *home = getenv("HOME");
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if (home == NULL || *home == '\0')
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errx(1, "cannot get home directory");
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chdir(home);
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for (found = i = 0; i < sizeof(calendarHomes) /
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sizeof(calendarHomes[0]); i++)
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if (chdir(calendarHomes[i]) == 0 &&
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freopen(calendarFile, "r", stdin)) {
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found = 1;
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break;
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}
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if (!found)
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errx(1,
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"can't open calendar file \"%s\": %s (%d)",
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calendarFile, strerror(errno), errno);
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}
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}
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if (pipe(pdes) < 0)
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return (NULL);
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switch (fork()) {
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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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uid = geteuid();
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if (setuid(getuid()) < 0) {
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warnx("first setuid failed");
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_exit(1);
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};
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if (setgid(getegid()) < 0) {
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warnx("setgid failed");
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_exit(1);
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}
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if (setuid(uid) < 0) {
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warnx("setuid failed");
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_exit(1);
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}
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execl(_PATH_CPP, "cpp", "-P",
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"-traditional", "-nostdinc", /* GCC specific opts */
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"-I.", "-I", _PATH_INCLUDE, (char *)NULL);
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warn(_PATH_CPP);
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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(FILE *fp)
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{
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uid_t uid;
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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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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 (fork()) {
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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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uid = geteuid();
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if (setuid(getuid()) < 0) {
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warnx("setuid failed");
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_exit(1);
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};
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if (setgid(getegid()) < 0) {
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warnx("setgid failed");
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_exit(1);
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}
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if (setuid(uid) < 0) {
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warnx("setuid failed");
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_exit(1);
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}
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execl(_PATH_SENDMAIL, "sendmail", "-i", "-t", "-F",
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"\"Reminder Service\"", (char *)NULL);
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warn(_PATH_SENDMAIL);
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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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